Thermal control method of grade of ore, and device for its implementation

FIELD: measurement equipment.

SUBSTANCE: invention refers to measurement equipment and can be used for automatic determination of metal concentration in ore. According to the method before control of grade of ore, ore passes through conveyor without metal impurities. For heating, area thermal source is used, which width does not exceed conveyor width. After time τspec when heating is finished, measured is average value of temperature based on heated surface of ore without metal T1av. Based on these measurements, formed is calibration curve. Then ore containing metal is continuously supplied to conveyor and heated. After time τspec average value of temperature Tavi is measured on each i frame. Value Tavi-T1av is determined based on calibration curve. Using value (Tavi-T1av), determined is percentage of metal in ore. Besides, a device for implementation of the above method is proposed.

EFFECT: improving reliability of determination of metal concentration in ore.

6 cl, 7 dwg, 1 tbl

 

The technical field

The invention relates to the field of measurement technology and can be used to automatically determine the concentration of metal in ore mined on the basis of control of the distribution of temperature fields of ore in the process of moving the receptacles on the conveyor of the conveyor for processing.

The level of technology

An increasingly important role in modern industry play a metallurgical production, the main task of which is on the background of the depreciation of fixed assets in the production of metal with maximum performance and high efficiency.

In this regard, the increasing role play methods of increasing concentrations of ore before processing.

There is a method of determining the quantitative content of precious metals in rocks and piles of mining production (patent RF №2425363).

The method consists in the acid decomposition of the sample, separation, drying and fusing the insoluble residue with sodium peroxide, leaching obtained after fusing alloy 2 N. hydrochloric acid, the concentration of gold and platinum group elements (PGE) from the joint solution of complexing sorbent and analysis of suspension by the method of atomic absorption spectrometry.

This method has sufficient accuracy for determining the composition of the metal, but it is applicable that the are in the laboratory for sample analysis of ore.

Closest to the claimed method is thermal lumpy separation of raw materials (variants) and a device for its implementation (options) (patent RF №2326738).

This method consists in the following.

The piece containing the useful component and waste rock, is subjected to the irradiation of the electromagnetic field of ultra-high frequency (UHF) within a certain time with a certain frequency, fixed with the help of thermal systems thermal image after cessation of exposure and before or after the cessation of decay heat exchange processes between the components of the controlled piece, which determine the average temperature on mathematical dependencies determine the mass fraction of useful component in the piece, the volume ratio of the concentration of the useful component in the piece, coefficient of volume filling of the useful component, the results carry out the separation of raw materials to the threads.

The disadvantages of this method are the following:

1. Biological hazard to operating personnel in connection with the use of powerful microwave radiation.

2. The ability to control only a small amount of ore due to the limited size of the microwave antenna.

3. Low capacity control: the method is applicable for individual pieces of ore.

4. Difficulties in use in the PR the production due to the small performance control.

Therefore, today there is a need to create an improved method for controlling the metal content in the ore is free from the above shortcomings, which can be used in practice for various ores using a simple and accurate equipment.

Fundamentally the approach to the solution of such problems has become possible with the development of diagnostic tools, based on registration and analysis of the temperature fields of the surface of the test object. The most noticeable results have emerged in the last decade.

This is due to:

1. The advent of modern technology based on the use of portable thermal imaging equipment (e.g., O. N. Buddin and other Thermal non-destructive testing products. M., Nauka, 2002; Buddin O. N., Vavilov B. N., Abramova, E. C. Thermal control. Diagnostics security. Under the General editorship of academician Klyuyev centuries - M.: Publishing house of the Spectrum, 2011, 171 S.; Salikhov, Z., Buddin O. N., Ismestiev E. N. Engineering fundamentals of thermal control. The experience of industrial application): ID Misa, 2008, - 476 S.;

2. The creation of modern mathematical apparatus (ibid, allowing to solve direct and inverse problem of nonstationary heat transfer, which gave the possibility of moving from inspection (defect detection) to deflectometry (detection of internal defects, which determine their characteristics and residual life assessment of products).

There are repeated attempts to solve the above problem in different ways. However, this did not lead to the desired results. This is due to several causes.

1. The most known methods are based on chemical reactions, are used in laboratory conditions and are not applicable in real production conditions

2. Some methods are dangerous from the point of view of safety (use a sufficiently powerful microwave radiation), for the operator - the operator.

The invention

The problem to which the invention is directed, is to develop a method and device for determining the concentration of ore in the metal during the actual metallurgical production.

The technical result consists in ensuring the accurate determination of the content (concentration) of the metal in the ore is in the production environment (in the process of moving the ore on the conveyor of the conveyor).

Additional technical result consists in the automatic control of concentration of ore to ensure maximum efficiency of the smelting process.

The technical result is achieved due to the fact that in the method for determining the metal content in the ore, which consists in the fact that the ore is subjected to irradiation, register temperature field after termination of the irradiation and after the termination zatuchni the heat exchange processes between the components of the ore, determine the average temperature and then determine the metal content in the ore,

before carrying out inspection, the metal content in the ore on the conveyor belt miss ore without impurity metal (0% metal content),

in the process of moving its ore continuously heated power "P" areal source of heat (infrared) radiation, thus:

- the width of the source exceeds the width of the conveyor, which moves the ore,

- power radiation source P, the speed of travel of the conveyor belt "V" and the heating time tn" connected by the relation of the optimal average temperature "T0cf" heating the ore registered square with coordinates (x, y):

T0cf=f(P, V, τass, tn),

where the functional dependence f(P, V, τass, tn) is determined based on the solution of unsteady heat equation. In the book of O. N. Buddin and other Thermal non-destructive testing products. M., Nauka, 2002, pages 39-47 detail the solution of this equation and provides a brief description of the relevant computer programs. Simultaneously with the functional dependence in the calculation process was determined by the numerical values of the parameters: P, V, τass, tn.

In the described theoretical justification of the method used by the payroll program pointed to by the I above.

Thus, optimality "t0cf" parameters of thermal excitation (P, V, τass, tn), should correspond to the dynamic temperature range thermal imaging system when it is configured before testing, and the maximum temperature of the ore on the conveyor.

Through time (τassafter heating to measure the average temperature of the heated surface ore containing metal (T1cf).

Time τassis determined using the above-mentioned literary sources of the conditions for heating the ore throughout the entire layer thickness with an error less than (δ). The definition of this quantity was conducted in accordance with the book of O. N. Buddin and other Thermal non-destructive testing products. M., Science, 2002, pp. 39-47.

On the basis of measurements form a calibration curve

Δ=f1(Tcf-T1cf), where

Δ - % of the metal content in the ore,

Tcf- the average surface temperature of the ore containing the metal (Δ· %).

The value of Tcfdetermined before carrying out inspection or experimentally on the basis of control of the calibration mixtures in accordance with subparagraph.2, 3 (calibration mixtures - mixtures with known metal content), or theoretically, based on the solution of non-stationary equation of Teplopribor the property. In the book of O. N. Buddin and other Thermal non-destructive testing products. M., Nauka, 2002, pages 39-47 detail the solution of this equation and provides a brief description of the relevant computer programs. In the following theoretical and experimental substantiation of the proposed method was used for calculation program shown above.

Next on the conveyor is continuously supplied ore containing the metal.

Through time (τassmeasure each frame (i) generated by the imaging apparatus, the average temperature Tcpi.

Measured value (Tcpi-T1cf).

On the basis of the calibration curve, using the value of (Tcpi-T1cf) determine the percentage of metal in the ore.

The technical result is reinforced by the fact that the registration of the temperature field of ore with metal carry out contactless using a thermal imaging system.

Spatial registration period the temperature field is determined by solving the system of equations:

Δa{(0,2...0,3)xΔxdmin, ewith alandΔ xdminΔydmin(0,2...0,3)xΔydmin,ewith alandΔydminΔxdmin

where ΔxDMP, ΔyDMPgeometrical dimensions of the temperature response from the minimum of the piece of ore.

The optimal interval of consecutive registration and analysis of the temperature field T(x, y)i(τ) is determined by solving the equation

P=1tTo-t2t2dηη-t2η+t2f(T)dTwhere

f(T) is the density distribution of the duration in remainingbalance signal

τ is the time interval measurements,

P - the probability of missing information signal,

T0temporal resolution of the measuring sensors.

Additional technical result is achieved due to the fact that the range of sizes of pieces of ore, since the minimum size (Δhdmp, ΔyDMP), determined by solving the system of equations:

{0ΔXminp(ΔXi)d(ΔX)=1-δ0ΔYminp(ΔYi)d(ΔY)=1-δ

where

δ is the probability that (Δxsubject, Δysubject)≥(ΔxDMP, ΔyDMP)

p(ΔXi) is the distribution function values Δsubject, Δysubject.

The technical result in part of the device is ensured by the fact that the device for determining the metal content in p is de containing ore feed apparatus, a device for irradiation of ore, a logger and a computer device, means for supplying ore made in the form of a conveyor, a device for irradiation of ore made in the form of areal source of thermal radiation, however additionally introduced:

the gauge of speed of movement of the conveyor,

gauge the distance between the end point of the heating area source of thermal radiation and the registration point of the temperature field imaging system,

the sensor size of the areal source of thermal radiation,

the registration unit for the temperature field,

the power set operation modes,

the electronic unit definition T1cf,

microprocessor unit for constructing the calibration curve, the electronic unit definition Tcpi,

the electronic unit determine the percentage of metal content in the ore, thermal imaging system, the sensor of the distance between the end point of the heating area source of thermal radiation and the registration point of the temperature field imaging system, the sensor size of the areal source of thermal radiation, the sensor of the speed of the belt, and the source of radiant heat is installed near a pipeline with the possibility of obtaining relevant information, and heating the ore, respectively,

the outputs of the sensor, R is stoane between the end point of the heating area source of thermal radiation and the registration point of the temperature field imaging system, sensor size areal source of thermal radiation, speed sensor moving conveyor and a source of thermal radiation are connected respectively to the first to fourth inputs of microprocessor-based building block of the calibration curve,

the output of thermal imaging system is connected to the input of the recording unit of the temperature field,

the output of the registration unit of the temperature field is connected to the input of the power set operation modes,

the first output block set modes connected via the electronic unit definition T1cf- for the fifth input of the microprocessor unit construction of the calibration curve,

the second output unit set modes of operation connected to the input of the electronic unit definition Tcpi,

the output of the electronic unit definition Tcpiconnected to the input of the electronic unit to determine the percentage of metal content in the ore, to the second input of which is connected to the output of the microprocessor unit construction of the calibration curve.

The essence of the invention and the possibility of achieving a technical result will be more clear from the following description with reference to the positions of the drawings, in which:

Fig.1 shows the structural diagram of the device

Fig 2 shows the graphs of the results of theoretical studies,

Fig.3 shows calibration curves,

Fig.4 p is eveden thermogram surface of the heated ore,

Fig.5 shows a calibration curve obtained from the results of experimental studies

Fig.6 shows a graph of the error in the determination of the metal content in the ore of the value of the metal content,

Fig.7 shows pictures of the heat controlling the concentration of metal ores.

In the above figures, the following notation:

1 - conveyor ore

2 - thermal imaging system,

3 - marketplace source of thermal radiation,

4 - speed sensor of coveyer,

5 - sensor distance,

6 - the sensor size of the heated area areal source of heat (infrared) radiation,

7 is a block registration

8 is an electronic block job mode (operation switch),

9 is an electronic block definition T1cf(adder No. 1),

10 is a microprocessor unit for constructing the calibration curve,

11 - electronic unit definition Tcpi(adder No. 2),

12 - electronic unit of comparison is the determination of the percentage of metal content in the ore,

13 - thermal device controlling the concentration of metal ores, including blocks: 4-12.

P is the heating power,

V - speed of movement of the conveyor ore

Lass- the distance between the end of heating and the registration of the temperature field,

Tassthe time of travel of the conveyor between the end of the of AREVA and check the temperature field,

Ln- the size of the heated area of the ore,

τn- move the conveyor in the area of the heated section.

The preferred embodiment of the invention

All the electronic components are built using standard microprocessor circuits and microprocessor Assembly with reprogrammable storage devices, and system management (disable/enable) system loading built on a standard relay systems (see, for example, Ugryumov E. P. Digital circuitry: educational. manual for schools. - 3rd ed. revised and enlarged extra - SPb.: - BHV-Petersburg, 2010). As the imaging device (2) used a thermal imaging company FLIR, IRTIS-2000 or similar technical characteristics. The method is as follows.

The impurity metal in the ore to increase the integral conductivity of the mixture of ore and metal (under the integral conductivity understand the average conductivity in the thickness of the mixture). Therefore, the heating temperature of the mixture will depend on the concentration of the metal. Thus, measuring the temperature of the surface and knowing the calibration curve (dependence of the temperature on the concentration of metal in the ore), the temperature value you can determine the value of the metal concentration.

The method is as follows

1. Before testing the soda is to maintain the metal in the ore on the conveyor belt miss ore without impurity metal (0% metal content).

2. In the process of moving its ore continuously heated power "P" areal source of heat (infrared) radiation, thus:

- the width of the source exceeds the width of the conveyor, which moves the ore,

- power radiation source P, the speed of travel of the conveyor belt "V" and the heating time tn" connected by the relation of the optimal average temperature "T0cf" heating the ore registered square with coordinates (x, y):

T0cp=f(P, V, τass, tn),

where the functional dependence f(P, V, tn) is determined based on the solution of unsteady heat equation. In the book of O. N. Buddin and other Thermal non-destructive testing products. M., Nauka, 2002, pages 39-47 detail the solution of this equation and provides a brief description of the relevant computer programs. In the following theoretical and experimental justification of the method used calculation program shown above.

Thus, optimality "t0cf" parameters of thermal excitation (R, V, τass, tn), should correspond to the dynamic temperature range thermal imaging system when it is configured before testing, and the maximum temperature of the ore on the conveyor, see the book of O. N. Buddin and other Heat is razrushayushie control products. M., Nauka, 2002, where on page 68 of 87 detail the methodological aspects of choosing the optimal relations between the temperature controlled surface (in this case t0cf") and parameters of technical facilities: characteristics thermal imaging equipment, the capacity of the heat source. This value is required for the correct choice of temperature range thermal imaging equipment.

3. Through time (τassafter heating to measure the average temperature of the heated surface ore containing metal (T1cf).

τass- the time interval between the end of heating and the time of registration of the temperature field.

This time interval is determined based on the solution of unsteady heat equation. In the book of O. N. Buddin and other Thermal non-destructive testing products. M., Nauka, 2002, pages 39-47 detail the solution of this equation and provides a brief description of the relevant computer programs.

4. On the basis of measurements form a calibration curve:

Δ=f1(Tcf-T1cf), where

Δ - % of the metal content in the ore,

Tcf- the average surface temperature of the ore containing the metal (Δ %).

The value of Tcfdetermined before carrying out inspection or experimentally based counter the La calibration mixtures in accordance with subparagraph.2, 3 (calibration mixtures - mixtures with known metal content), or theoretically, based on the solution of unsteady heat equation. In the book of O. N. Buddin and other Thermal non-destructive testing products. M, Science, 2002, pages 39-47 detail the solution of this equation and provides a brief description of the relevant computer programs. In the following theoretical and experimental substantiation of the proposed method was used for calculation program shown above.

5. Next on the conveyor is continuously supplied ore containing the metal.

6. Through time (τassmeasure each frame (i) the average value of the temperature Tcpi.

7. Determine the magnitude (TSPI-T1cf).

8. On the basis of the calibration curve, using the value of (TSPI-T1cf) determine the percentage of metal in the ore.

9. Check the temperature field design carry out contactless using a thermal imaging system.

10. Spatial registration period the temperature field is determined by solving the system of equations:

Δa{(0,2...0,3)xΔxdmin, ewith alandΔxdminΔydmin(0,2...0,3)xΔydmin,ewith alandΔydminΔxdmin

where ΔxDMP, ΔyDMPgeometrical dimensions of the temperature response from the minimum of the piece of ore.

11. The optimal interval of consecutive registration and analysis of the temperature field T(x, y)i(τ) is determined by solving the equation

P=1tTo-t2t2dηη-t2η+t2f(T)dT

f(T) is the density distribution of the duration in time of the information signal,

τ is the time interval measurements,

P - the probability of missing information signal,

T0temporal resolution of the measuring sensors.

11. The range of sizes of pieces of ore since the minimum size (Δhdmp, ΔyDMP), determined by solving the system of equations:

{0ΔXminp(ΔXi)d(ΔX)=1-δ0ΔYminp(ΔYi)d(ΔY)=1-δ

where

δ is the probability that (Δxsubject, Δysubject)≥(ΔxDMP, ΔyDMP),

p(ΔXi) is the distribution function of the values of Δxsubject, Δysubject.

The technical result in part of the device is ensured by the fact that the device thermogravitational separation of raw materials (patent No. 2326738) is further provided with:

- areal source of heat (infrared) radiation power P 3,

sensor 4 speed V of movement of the conveyor 1,

- proximity sensor - Lass=Vxτass- 5 between the end of the heating area source of heat (infrared) radiation power "" 3, and the registration of the temperature field T(x, y) imaging system 2,

sensor size 6 areal source of heat (infrared) radiation:

Ln=Vxτn,

the recording unit 7 temperature field T(x, y),

- unit 8 job modes,

- electronic unit 9 definitions T1cf,

- microprocessor unit 10 construction of the calibration curve,

- electronic unit 11 definition of Tcpi,

- electronic unit comparing 12 - determine the percentage of metal content in the ore.

When the inputs of a thermal imaging system 1, proximity sensor - Lass=Vxτasswith 5 sensor 6 size of the areal source of heat (infrared) radiation sensor 4 speed V of the moving conveyor and a source of heat (infrared) radiation 3 are associated with the conveyor, the outputs of the distance sensors - Lass=Vxτass5 areal size of the source of heat (infrared) radiation 6, the speed V of movement of the conveyor 4 and the source of heat (infrared) radiation 3 is connected, the COO is responsible, 1, 2, 3, 4 input unit 10, the output of the imaging system 2 is connected to the input of the recording unit 7 temperature field T(x, y), the output of the registration unit 7 temperature field T(x, y) is connected to the input unit 8 job modes, the 1st output block 8 set modes of operation connected to the input unit 9, 2nd output unit 8 is connected to the input unit 11 definition of Tcpithe output of block 9 is connected to the 5-th input of the microprocessor unit 10, the output of block 11 defining Tcpiconnected to the input of the electronic unit comparing 12 - determine the percentage of metal in the ore to the second input of which is connected to the output of the microprocessor unit 10 build the calibration curve.

The device operates as follows.

At the first stage on the conveyor belt 1 is passed ore without admixture of metal. The conveyor moves at a speed "V". Carry out heating of the ore source 3 during the time τn" or at a distance "Ln". The heated area of the ore through time "τass" or distance "Lass" enters the field of view of the imaging system 2. Thermal imaging system 2 registers a temperature field T(x, y) within the field of vision through the block set 8 modes (switch) is supplied to the electronic unit 9 - adder, where the determination of the values T1cf- the average temperature of the surface ore is without impurity metal in the area of field of view imaging system according to the formula

T1cp=(1/N)ΣT(x, y)j,

where N is the number of measurement points of the temperature in the area of field of view,

j is the number of measurement points of the temperature in the area of field of view,

Σ is the sign of the amount.

The value of T1cffrom block 9 is transmitted to the microprocessor unit 10. Simultaneously, in block 10 receives signals from blocks: 4 - the amount of the movement of the conveyor, 5 - about the size of the distance - Lass=Vxτass6 - size of area source of heat (infrared) radiation, 3 - power heat source of the heat (infrared) radiation. In block 10 on the basis of available reference points T1cf" on the basis of the mathematical models described in the above sources, is determined by the calibration curve, i.e. the dependence of

Δ=f1(Tcf-T1cf).

Here the value of Tcfadjusted with respect to T1cf(i.e., when Δ=0) and next on the basis of mathematical models calculated with different values of Δ. Below in the section "research" will be given this dependency.

After determining the calibration curve of the unit 10 is transmitted to the electronic unit 12 comparison.

After determining the calibration curve unit 8 switches to the control mode. The value of T(x, y) of unit 7 enters the block 11 to the adder, where the determination of the values of Tcpiwith a given period is according to the formula

Tcpi=(1/N)ΣZT(x, y)ji.

The optimal interval of consecutive registration and analysis of the temperature field T(x, y)i(τ) is determined by solving the equation

P=1tTo-t2t2dηη-t2η+t2f(T)dT,

f(T) is the density distribution of the duration in time of the information signal,

τ is the time interval measurements,

P - the probability of missing information signal

T0temporal resolution of the measuring sensors.

The value of Tcpifrom the block 11 is passed to the block 12, where the computation of the values (TSPI-T1cf) and its comparison with the calibration curve. The result is determined by the amount of Δ - metal content in the ore, i.e., solves the problem posed in this patent - determination of metal content in the ore in a production environment.

The rationale of the proposed method was carried out theoretical way, and ek the pilot.

Consider theoretical research method.

On the basis of mathematical modeling methods described in literature

1. O. N. Buddin and other Thermal non-destructive testing products. M., Nauka, 2002.

2. Budden O. N., Vavilov B. N., Abramova, E. C. Thermal control. Diagnostics security. Under the General editorship of academician Klyuyev centuries - M.: Publishing house of the Spectrum, 2011, 171 S.

3. Salikhov, Z., Buddin O. N., Ismestiev E. N. Engineering fundamentals of thermal control. The experience of industrial application): ID Misa, 2008, - 476 S.

Mathematical model of thermal process control, used in the present invention.

On the basis of the mathematical model defined thermal control of ore.

In Fig.2, as an example, shows some graphs of the results of theoretical studies.

In Fig.3, as an example, some of calibration curves based on the results of theoretical research.

If we assume that the resolution of the temperature the ability of thermal imaging technology in a production environment is on average 0.5 deg, the results show that the method allows to determine the concentration of metal in the ore with an error of no more than 0.8%, which is sufficient for practical use.

Experimental studies of the wire which were in accordance with the above description. To simplify the experiment without compromising the accuracy of the obtained results of experimental studies were conducted on the fixed pipeline.

Procedure the experimental work was as follows.

On the surface of the poured ore without metal content. Then the ore was heated for 15°C infrared radiation power P=50 kW/m2. 10-12°C were recorded temperature field. In Fig.4 shows thermogram of the ore without the metal content. The average surface temperature T1cf=81°C.

Next, on the basis of this average temperature was determined calibration curve (Fig.5).

Later in the ore was mixed metal (from 1% to 10%) and record the surface temperature field and on the basis of the calibration curve was determined by the metal content in the ore and compared this set with the actual content. On the comparison of the determined relative error of the method (µ).

µ=|Δ-Δ0|×100%/Δ0here

Δ0- the real metal content in the ore,

Δ - grade material, determined in accordance with the proposed method.

In Fig.6 shows a graph of the errors in the determination of the metal content in the ore of the value of the metal content.

It is evident from Fig.6 shows that the maximum error in the determination of metal content in the ore does not exceed 0,73%, which is completely otverzhdaetsya theoretical research.

Research results and comparison of experimental results with the method of control adopted as the closest analogue is given in table 1.

No more than 10%
PMNumerical and qualitative values of the parameter
InventionPrototype method
234
The ability to control objects in real operational conditionstherelimited
The need for special equipmentEquipment serial, no special requirementsEquipment is expensive, stationary, with biohazard
ErrorNot more than 0.80%
Field of viewReal 2×2 m (limited by the geometric resolution of the equipment)Limited area of a radiating antenna, really not more than 0.3×0.3 m
The performance of the controlNot less than 3 m2/SNot defined

The method has the following advantages:

- provides control in real operating conditions,

- allows to increase the reliability of testing results, approximately 3 to 10 times,

- allows to improve the reliability of operation of the control system,

- improves the efficiency of metallurgical processes.

1. Method for determination of metal content in the ore, which consists in the fact that the ore is subjected to irradiation, register temperature field after termination of the irradiation and after the cessation of decay heat exchange processes between the components of the ore, determine the average temperature and then determine the metal content in the ore, characterized in that
before carrying out inspection, the metal content in the ore through the pipeline p is lower ore without impurity metal,
in the process of moving its ore continuously heated power P areal source of thermal radiation, the width of which exceeds the width of the conveyor,
after a time τassafter heating to measure the average temperature of the heated surface ore containing metal (T1cf),
on the basis of measurements form a calibration curve:
Δ=f1(Tcp-T1cp),
where Δ - % of the metal content in the ore, Tcf- the average surface temperature of the ore containing the metal (Δ %),
next on the conveyor continuously served ore containing the metal, heated power P,
after a time τassmeasure each frame of the first video image of the temperature field average value of temperature Tcpi,
determine the value of Tcpi-T1cf,
on the basis of the calibration curve, using the value of (Tcpi-T1cfdetermine the percentage of metal in the ore.

2. The method according to p. 1, characterized in that the registration of the temperature field of ore with metal carry out contactless using a thermal imaging system.

3. The method according to p. 1, characterized in that the spatial period of the registration of the temperature field is determined by solving a system of equations:
Δa{ (0,2...0,3)xΔxdmin,ewith alandΔxdminΔydmin(0,2...0,3)xΔydmin,ewith alandΔydmin<Δxdmin
where ΔxDMP, ΔyDMPgeometrical dimensions of the temperature response from the minimum of the piece of ore.

4. The method according to p. 1, characterized in that the optimal interval between successive registration and analysis of the temperature field T(x, y)i(τ) is determined by solving the equation
P=1tTo-t2t2dηη-t2η+t2f(T)dT ,
where f(T) is the density distribution of the duration in time of the information signal,
τ - time of the measurement interval,
P - the probability of missing information signal,
T0temporal resolution of the measuring sensors.

5. The method according to p. 1, characterized in that the range of sizes of pieces of ore, since the minimum size (ΔxDMP, ΔyDMP), determined by solving the system of equations:
{0ΔXminp(ΔXi)d(ΔX)=1-δ0ΔYminp(ΔYi)d(ΔY)=1-δ
where δ is the probability that (Δxsubject, Δysubject)≥(ΔxDMP, ΔyDMP),
p(ΔXi) is the distribution function values Δsubject, Δysubject.

6. Device for determining the metal content in the Ude, containing ore feed apparatus, a device for irradiation of ore, a logger and a computer device, characterized in that the means for supplying ore made in the form of a conveyor, a device for irradiation of ore made in the form of areal source of thermal radiation, in addition entered:
the sensor of the speed of the belt,
gauge the distance between the end point of the heating area source of thermal radiation and the registration point of the temperature field imaging system,
the sensor size of the areal source of thermal radiation,
the registration unit for the temperature field,
the power set operation modes,
the electronic unit definition T1cf,
microprocessor unit for constructing the calibration curve,
the electronic unit definition Tcpi,
the electronic unit determine the percentage of metal content in the ore,
thermal imaging system, the sensor of the distance between the end point of the heating area source of thermal radiation and the registration point of the temperature field imaging system, the sensor size of the areal source of thermal radiation, the sensor of the speed of the belt, and the source of radiant heat is installed near a pipeline with the possibility of obtaining relevant information, and heating the ore, respectively,
output the s sensor the distance between the end point of the heating area source of thermal radiation and the registration point of the temperature field imaging system, sensor size areal source of thermal radiation, speed sensor moving conveyor and a source of thermal radiation are connected respectively to the first to fourth inputs of microprocessor-based building block of the calibration curve,
the output of thermal imaging system is connected to the input of the recording unit of the temperature field,
the output of the registration unit of the temperature field is connected to the input of the power set operation modes,
the first output block set modes connected via the electronic unit definition T1cf- for the fifth input of the microprocessor unit construction of the calibration curve,
the second output unit set modes of operation connected to the input of the electronic unit definition Tcpi,
the output of the electronic unit definition Tcpiconnected to the input of the electronic unit to determine the percentage of metal content in the ore, to the second input of which is connected to the output of the microprocessor unit construction of the calibration curve.



 

Same patents:

FIELD: test equipment.

SUBSTANCE: test bench comprises the appliances to place the unit under test thereat, source of temperature effects with water feed and drain systems arranged under said unit and vertical screen. The latter is arranged along the edges of said source and secured at the columns and elevated above soil to vary the spacing between soil level and source lower edge. Besides it incorporates the system of protection against satellite observation of tests and unit under test. Said system comprises horizontal screen secured from above at vertical screen columns. Said vertical screen consists of metal frame and refractory metal cables spaced in parallel along the frame lengthwise axis and over width exceeding the object overall dimensions. Said cables are braided in crosswise direction at the screen centre part by nichrome bands completely covering the object outlines.

EFFECT: higher accuracy of tests, protection against observation from space.

3 dwg

FIELD: measurement equipment.

SUBSTANCE: invention relates to measurement equipment and can be used for heating and temperature measurement of specimens, which are transparent in an infrared (IR) radiation region. The invention proposes a method for determination of temperature of specimens, which are transparent in an IR region, subject to action with flows of charged particles or electromagnetic radiation, which involves heating or cooling of specimens, measurement of temperature of specimens by means of thermocouples. Specimens are placed in a closed housing made from material with high thermal conductivity and located in a vacuum chamber; air is pumped out till the pressure is 10-3-10-5 Pa; the housing is heated or cooled at the specified temperature interval. Continuous preliminary temperature measurements are performed with thermocouples located outside and inside the housing together with the test specimens till temperature stabilisation moment. Then, final temperature measurements are performed with these thermocouples at a stabilisation moment of the temperature that coincides with the temperature of the test specimen till external action with flows of charged particles or electromagnetic radiation. External action is performed; after external action is completed, a specimen temperature measurement procedure is repeated.

EFFECT: improving accuracy of determination of temperature of specimens transparent in an IR region.

1 dwg

FIELD: measurement equipment.

SUBSTANCE: group of inventions relates to measurement equipment and can be used for testing of fire-resistant efficiency of protective compounds and coatings for timber. The proposed method involves preparation of a specimen, flame action on the specimen, temperature measurement of exhaust gaseous combustion products, measurement of weight of the specimen and determination of weight loss, as per which fire-resistant efficiency is determined. Specimen weight measurement is performed continuously during flame action on the specimen and after the action is completed, and a moment exceeding the limit weight loss established by classification or moment of stabilisation of specimen weight after completion of its burning is taken as a test completion moment. This method is implemented by a device containing a chamber for arrangement of a specimen, a gas burner, an exhaust system with a thermoelectric converter, an instrument for measurement and recording of temperature of exhaust gaseous combustion products. The device is also equipped with a unit for automatic measurement and recording in time of specimen weight during fire tests, which includes a lever mechanism made so that a specimen holder can be installed and connected to a weight measurement instrument connected to the processing and recording unit.

EFFECT: obtaining more accurate data for investigation of a fire protection mechanism.

5 cl, 1 tbl, 4 dwg

FIELD: power engineering.

SUBSTANCE: reactor vessel steel samples are heated to temperature from 300°C, their further ageing is carried out at this temperature within certain time, subsequent tests of samples are carried out for impact bending, and test results are analysed to determine the value of the shift of critical brittleness temperature, at the same time samples of reactor vessel steel in process of ageing at the temperature of reactor vessel operation of 300-320°C are additionally exposed to neutron radiation with flux of 1011-1013 n/cm2·sec for 103 hours, after that they perform baking at the temperature of 400-450°C with duration of at least 30 hours, and assessment of extent of steel embrittlement is determined using the value of shift of critical brittleness temperature ΔTk(t) as a result of thermal ageing for the time making more than 5·105 hours, in accordance with a certain mathematical expression.

EFFECT: increased accuracy of assessment of extent of embrittlement of VVER-1000 reactor vessel embrittlement as a result of thermal ageing.

3 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to monitoring the flue gas composition. This method is suitable for monitoring of steam boiler operation at burning the chlorine-containing fuel. It can also be used at pyrolysis, gasification and the like processes. Composition of flue gases resulted from thermal processes, particularly, at combustion of biological fuel or fuel produced from wastes is monitored by measurement of quantity of particles of definite sizes at, at least, one point in flue gas path. Measured are particles of sizes that are known to be composed of alkaline metal chlorides.

EFFECT: monitoring of alkaline metal chloride compositions in flue gases.

9 cl, 6 dwg

FIELD: physics; control.

SUBSTANCE: invention relates to space, aviation, radio engineering, instrument-making and mechanical engineering and can be used in all industries for automatic control of the thermal state and functional parameters of technical devices. The method for automatic control of the thermal state and functional parameters of technical devices involves setting and determining the type and parameters of thermal functions of technical devices, from which values of thermal functions during operation of the devices and downtime thereof are calculated, and making adjustments in actuating devices through a numerical control computer system upon reaching the calculated values of set acceptable values. The method involves determining the type, the time variation characteristics of standard laws of thermal functions of the position, movement and state of technical devices, heat-loaded parts thereof, assemblies and components during heating and cooling thereof for each controlled functional parameter during operation of a technical device and during downtime thereof. Statistical characteristics of the time variation of thermal functions of heating and cooling for each controlled functional parameter during operation of the device and during downtime thereof are established during multiple tests. The obtained characteristics of the time variation of thermal functions in the working volume of the technical device during operation and downtime thereof are then used to calculate the value and/or position and/or movement and/or state of the controlled functional parameter in accordance with the operating time or downtime, for the current range of positions, movements and states of heat-loaded parts, assemblies and components of technical devices, and when values and/or positions and/or movements and/or states reach, with given probability, set acceptable values, the controlled functional parameter of the technical device is adjusted through a numerical control computer system by changing and acting on current parameters and functioning characteristics which define the level of the thermal conditions or state of heat-loaded devices.

EFFECT: high accuracy of functioning of technical devices, high reliability thereof, stability of maintaining the level or range of values of functional output parameters of the position, movement and state of technical devices during operation thereof, carried out without using additional mechanisms, devices and systems for measuring temperature and/or thermal deformations and/or the position and/or movement and/or state of heat-loaded parts of devices.

6 dwg

FIELD: measurement equipment.

SUBSTANCE: device comprises: a sensor comprising a sensitive element and a heating element configured for heating of the sensitive element to the previously set operating temperature, besides, the sensitive element is perceptive to the specified gas so that at least one electric property of the sensitive element varies depending on presence of the specified gas, besides, the electric property of the sensitive element is measured by a gas metering device; and a control circuit comprising a heating element controller connected to the heating element and measuring its electric property, besides, the control circuit has a source of heating energy supplying energy to heating element. The controller of the heating element is connected with a source of heating energy and controls its operation depending on measurement of the electric property of the heating element; a facility of pulse modulation connected with the controller of the heating element, the source of heating energy for control of the energy value supplied to the heating element. At the same time the facility of pulse modulation is made as capable of generation of the first set of energy pulses, having certain duration, and the second set of energy pulses, having another, shorter duration for maintenance of temperature of the heating element substantially at the permanent level. Also the invention relates to the method for manufacturing and method of operation of the gas metering device.

EFFECT: device is manufactured and operated in a profitable and reliable manner.

8 cl, 5 dwg

FIELD: physics.

SUBSTANCE: method of determining dryness of wet steam involves measuring pressure in a controlled stream of steam. A steam sample is then collected from the controlled stream, the collected sample is throttled into a flow chamber and calculations are carried out based on the measured parameters. The collected steam sample flows from the first flow chamber into a second flow chamber. Both chambers are placed in the controlled stream of steam or other heating medium. Pressure and temperature is measured in each chamber. After the second chamber, flow rate, pressure and temperature of the collected sample is measured. The value of flow rate is then established based on parameters measured in the first chamber.

EFFECT: determining dryness of a stream of wet steam without condensing the collected sample.

1 dwg

FIELD: measurement equipment.

SUBSTANCE: sample is heated to temperature of polymer binder decay. Filler content is calculated by variation of a sample mass, taking into account the ash residue in process of polymer binder decay defined under conditions identical to composite decay. At the same time the variation of the sample mass is defined according to a thermogram.

EFFECT: higher accuracy of detection of filler content in a polymer composite, reduced time of analysis, lower labour and power inputs.

3 dwg

FIELD: measurement equipment.

SUBSTANCE: method to display a temperature field of an object includes measurement of temperature in different points of its surface. Previously an object image is introduced into a computer base, and the image is displayed onto the screen, the points of temperature measurement on the surface of the object are displayed on the object image on the monitor screen, and after performance of measurements and treatment of results of measurements in the computer the image of the temperature field of the object is formed on its image with software.

EFFECT: simplified design of technical facilities used to vary temperature field of an object.

6 cl, 1 dwg

FIELD: physics.

SUBSTANCE: sensor having a filter device, at the output of which there is a detector device, and an analysis device which is connected to the detector device. The filter device has a first control filter and a second control filter, the two filters having a first control band and a second control band respectively. The measured intensity densities of the first control band and the second control band are used to estimate the temperature of the radiating source. The first and second control filters form a control system, and control bands thereof form a system of control bands distributed on both sides of a preliminary band.

EFFECT: high measurement accuracy.

9 cl, 13 dwg

FIELD: physics.

SUBSTANCE: disclosed is a method for noninvasive optical determination of temperature of pulsating blood inside the body, wherein the analysed medium is irradiated with infrared and/or visible light in the region of the absorption spectral line, the position of which depends on temperature of the medium. Light absorption is measured in the region of the absorption spectral line and temperature is determined based on said measurement by comparing with calibration data. The method is characterised by that the medium is irradiated with radiation with at least two discrete wavelengths which, in the region of the absorption spectral line, are located on different sides of the absorption maximum. At least one temperature dependent measured value is determined based on the ratio of said two absorption values. Temperature is determined based on said measured value by comparing with previously obtained calibration data.

EFFECT: high accuracy of determining ambient temperature.

10 cl, 5 dwg

FIELD: measurement equipment.

SUBSTANCE: pyrometer of spectral ratio comprises a lens, which fixes an image of a controlled body on a photodetector, in front of which a radiation filter is installed, an amplifier of a photodetector signal, a microprocessor with two analogue-to-digital converters, a temperature indicator and a power supply element. Additionally, a switch controlled by a microprocessor is introduced, one pole of which is connected to a power supply element, and the second one - to the amplifier's input, at the same time the common pole of the switch is connected to the photodetector.

EFFECT: simplified design of a spectral ratio pyrometer, higher sensitivity of a spectral ratio pyrometer.

2 dwg

FIELD: physics.

SUBSTANCE: method involves use of a colour RGB camera to record radiation intensity of a reaction product in the red, green and blue wavelength ranges. A chemiluminescence value is generated from the corresponding blue signal of the colour RGB camera. A Planck radiation value is generated from the corresponding red and/or green signals of the colour RGB camera through comparative pyrometry. The radiation intensity value is generated by comparative pyrometry based on the difference between chemiluminescence value and the corresponding Planck radiation value. The apparatus includes a colour RGB camera connected to a processing unit, having means of determining chemiluminescence values from the blue signal of the colour RGB camera and Planck radiation values from the red and/or green signals of the colour RGB camera by comparative pyrometry, and means of determining radiation intensity based on the difference between chemiluminescence and Planck radiation values.

EFFECT: method which reduces complexity and provides high reliability.

10 cl, 8 dwg

FIELD: physics.

SUBSTANCE: apparatus for measuring surface temperature in the region exposed to laser radiation has a galvano scanner with a F-teta lens and a two-channel optical pyrometer with a lens. The apparatus additionally includes a gradient mirror with a central elliptical region with 100% transmission of laser radiation and with a broadband reflecting coating on the periphery of the mirror, lying at an angle of 45° to the optical axis and optically connected to the laser and the optical pyrometer with a lens, wherein the pyrometer detects thermal radiation of the surface in several narrow spectral intervals near the laser radiation line and in the reflection spectral band of the mirrors of the galvano scanner.

EFFECT: design of an apparatus for measuring surface temperature in the region exposed to laser radiation when scanning the surface with a galvano scanner with a F-teta lens.

1 dwg

FIELD: physics.

SUBSTANCE: method for noncontact measurement of thermal characteristics of a moving object involves optical reception of the thermal radiation signal of the object, spectral decomposition of the signal and formation of an image of the radiation spectrum on the surface of an array of receivers whose output signals are processed by a processor module. Processing with the processor involves object parameter type invariant approximation of approximation signals of the data base of each object parameter, selection of the most accurate approximant and outputting the corresponding parameter value and error in determining said value.

EFFECT: increase in number of measured parameters and high accuracy of measuring thermal characteristics.

2 dwg

FIELD: physics.

SUBSTANCE: hot surface of a body is scanned from the front and the back in the direction of movement. Radiation flux with radially symmetrical spectral distribution is formed on each surface. Spectral components of radiation flux picked up from the front and the back is focused along its optical axis. The radiation is spectrally decomposed and the spectral energy distribution in the spatial distribution radiation spectrum of the front and rear surfaces of the body is analysed. The current temperature in real space-time coordinates of the moving body is determined from the spectrum and its moving away from or approaching focused receivers.

EFFECT: high reliability and efficiency of thermal monitoring moving bodies in foundry and metallurgy.

FIELD: physics.

SUBSTANCE: method involves optical reception of the thermal radiation signal of the object, spectral decomposition of the signal, formation of an radiation spectrum image on the surface of a matrix of receivers, signals from the outputs of which are approximated by approximants of a Planck function database for a set of temperature values. The most accurate approximant is selected and its corresponding temperature value and error are output. The same signals from the receiver matrix are approximated using the database for a set of images of the object. The most accurate approximant is selected and its corresponding error for identifying the image of the object is output in form of a drive alignment signal with possibility of aligning the optical system in the direction of the moving object.

EFFECT: higher accuracy of measuring temperature of a moving object owing to automatic alignment on zero bias of spectral decomposition and use of energy of all receivers in the receiver matrix.

1 dwg

FIELD: physics.

SUBSTANCE: method of measuring temperature in areas with ionising radiation involves putting a sample of fissile material into a reactor core, placing near a fibre-optic guide made from the same material as an additional light guide in form of a loop. Thermal radiation from the surface of the sample of fissile material is output through the fibre-optic guide. Luminosity is measured in at least two spectral ranges, from which temperature of the analysed sample is determined. Optical radiation is transmitted to the additional light guide in form of a loop and the measured temperature is corrected using change in transparency of the light guide loop in the same spectral ranges. The optical source is a photometric lamp with a tape incandescent body.

EFFECT: design of a method of detecting the temperature field of samples of fissile material in certain local points when burnt through pulsed irradiation with reactor neutrons.

2 cl, 1 dwg

FIELD: measurement equipment.

SUBSTANCE: invention is related to the field of pyrometry and radiometry. Method includes collection and focusing of heat radiation, extraction of N spectral ranges, conversion of radiation in each spectral range into electric signal, their amplification and digitisation, detection of the first N-1 derivative signals of central spectral range by wave length, measurement of temperature and emissive power of object by functional ratio that relates selected signal and its derivatives.

EFFECT: expanded coverage of analysed objects with increase of spectral range of emissive power measurement by measured temperature.

5 cl, 1 dwg

FIELD: electricity.

SUBSTANCE: contactless sensor to measure electric charge of mineral moving particles comprises a sensitive electrode with inner channel of variable cross-section, high-quality isolator and grounded electrode, which upper part is made as a truncated pyramid with inner surface of the pyramid side faces inclined towards the sensor vertical axis selected in the range of 30-55 degrees.

EFFECT: reducing a number of parasitic actions of the actuating mechanism, whereby share of the associated minerals is reduced in the concentrate, improving condition of the concentrate without additional time and power costs.

4 dwg

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