A device for determining the moisture content of sawn timber
(57) Abstract:Usage: woodworking industry, drying of stacks of lumber in the cells of periodic action. The inventive device for determining the moisture content of lumber includes weight sensors, which are made with the use of strain gages installed on podstrelennoy cart, block registration, control, measuring and switching, adder, approximation, blocks, determinants of the final drying time, the final mass of the pile, the current mass of the pile, the equilibrium moisture content and the current moisture content of materials, the differentiator and the time counter. 5 Il., table 1. The invention relates to woodworking industry and can be used for drying of stacks of lumber in the cells of periodic action.Improving the efficiency of the drying humidity-controlled timber industrial drying plants is an urgent task for the woodworking industry.A device for determining the moisture content of the pile, containing mechanical sensors shrinkage of lumber associated with electrical displacement transducer the implementation, that excludes the possibility of its use in industry 
A device for measuring the moisture of the paper web containing moisture meters, weight sensor, calculating a crucial block  However, use it when drying is not possible, because the device does not provide the task.The closest in technical essence and the achieved result is a device for determining the moisture content of lumber containing weight sensors, the registration unit and the control unit 
Changing the temperature in the drying process will lead to an unmanageable error caused by change of fluid pressure in the device, which will reduce the humidity measurement accuracy.The purpose of the invention improve the efficiency of production operations and reliability of measurements of moisture content during drying of lumber.In the device for determining the moisture content of lumber during drying, containing podstelennuyu cart, weight sensors, measurement systems, each weight sensor is made in the form of a load cell that contains the rod and the strain gages installed on the membrane attached to the housing, the sensors Usachyov, while the strain gages of each sensor is connected via a plug and socket, placed on podstrelennoy cart, measuring system, and the sensor housing is provided with horizontal and vertical supports for the rod. In order to increase the reliability of results in the measurement system of the apparatus for determining the moisture content of the pile of lumber containing block adder, a registering device connected between the weight sensor and recording device switching unit and the measurement unit of approximation, the differentiator, the unit-determinant of the final drying time, the unit-determinant of the final mass of the pile, the unit-determinant of the equilibrium moisture content, unit-determinant of the current mass of the pile, the control unit, the timer, the unit for calculating the current moisture content of the pile, with its outlet connected with the registration unit, and the three inputs are connected with the corresponding outputs of the block determinant of finite mass the output of the block identifier of the current mass of the pile, the first entrance through which the time counter is connected with the control unit, the second input is connected with the output of the block approximation, consistently connected to the differentiator, the block identifier in the final drying time and the first input of the block opredelenijaja adder, the input block of the adder are connected to the corresponding outputs of the sensors weight through the unit of measurement and switching, connected to the control unit, the block of the equilibrium moisture content of lumber is connected to the outputs of the temperature sensors and the degree of saturation of air in the chamber.The device eliminates the need for sampling of lumber from the pile, their subsequent final drying and weighing to determine before the beginning of the drying process of the mass of absolutely dry stacks, this value is calculated directly in the drying process by analyzing changes over time weight stacks implemented in the initial drying period on the basis of three to four measurements.Due to the inclusion in the system of the measurement device for determining the moisture content of the differentiator, adder, block-identifier end time drying unit calculating the current mass of the pile, block calculate the final mass of the pile, they gain the ability to predict the moisture content of lumber during the drying process with the required accuracy, which ensures effective regulation of the parameters of the drying agent in the chamber to reduce drying time, improve the quality of products is tailored in as sensors use strain gages, greatly simplifies the implementation of the technical solutions in the industry and does not require major reconstruction of the drying chambers.As a result of implementation of the invention achieve high technical and economic effect: reduce the time and material work on carrying out the drying of wood, improve the quality of the final product.In Fig. 1 shows a diagram of installation of the pile of lumber in the kiln of Fig.2 structural diagram of a weight sensor of Fig.3 section a-a in Fig.2; Fig.4 depicts a block diagram of the measurement system of Fig.5 presents the dependence of the mass of the pile in drying time by measuring the weight, the weight of the absolutely dry stacks and mass equilibrium moisture in the pile.An example of the method of drying.Lumber in advance is placed in a pile on podstrelennoy cart and loaded into the drying chamber through the plug connector plug weight sensors installed on podstrelennoy cart, with the measuring system is placed outside the chamber, carry out the initial heating of the wood supply in the camera hot drying agent and removal of the camera. Then for a given mode, perform processesare sensors weight. To determine wood moisture measuring the weight of the pile in three or four points, corresponding to different moments of time. The period of time between measurements can be 1-10 h, the specific value is determined based on the selected mode of drying, types of wood, the type of drying device. Based on measurements calculated approximating the dependence of the mass of the pile from drying time, determine the equation of the drying rate, calculate the final drying time and the calculated value of absolutely dry mass of the pile periodically determine the estimated value of the current moisture content of the stack at desired moments of time in the process, and the drying of produce to achieve the moisture content of lumber in the stack is the value required in accordance with technical condition.When drying chamber stacks the period of constant drying rate is missing, so the current values of the masses of lumber, some weighing approximate the least-squares exponential polynomial
M()ajj(1) where ajthe coefficient of the polynomial;
the current time;
k the degree of the polynomial.The choice of the degree of the polynomial effected on the basis of the required tecnomen time is defined as the ratio of the difference between the measured mass of the pile and it is calculated according to approximarely the polynomial values to the measured weight of the pile
For this example we used the polynomial of degree k 1 (linear dependence) and a polynomial of degree k 2 (parabolic dependence). Based on the analysis of the errors presented in the table, the best approximation of the measured values of the mass of the pile is achieved by the use of a parabolic dependence of the form
M( ) 19,99 0,153 +
+ 6,66 10-42. (3)
Equation drying rate is determined by the differentiation power of polynomial-time
jajj-1(4) For this example
-0,153+1,33210-3(5) the Moisture of the pile will be removed and its weight reaches a constant value, provided that the drying speed becomes equal to zero.From this condition, by equating equation (5) to zero, calculate the final drying time
Kon= =C (6)
At the end of the drying process the mass of the pile is defined as
MKon) Mdry+ Mp, (7) where Mpmass equilibrium (non-removable) of moisture in the pile.Using relations (7) calculate the mass of absolutely dry stacks. The value of Mpdetermined by the well-known dependency of the equilibrium moisture content of lumber Wpfrom these parameters of the drying agent in the ear of the environment in the chamber.Since
Mp= Mdry(8) equation (7) can be written as
M(Kon) 1+ Mdry(9)
From the formula (9) obtained an expression for the calculation of the mass of absolutely dry pile
Substituting the expression (10) in formula (1), gain ratio for calculating the current moisture content of the pile on the proposed method
W(1) 1+ -1100%
For the considered example of the drying chamber temperature t 30oand the degree of saturation of 0.55, which corresponds to the value of Wp10% calculations of the moisture content of the pile for drying time spent for the data shown in Fig.5, are illustrated by table.As follows from the table, the desired final moisture content of the wood is equal to W 13% are provided at a given drying mode after 100 h after the start of the process, then heating stopped and the stack is unloaded from the drying chamber.According Fig.1-3, a device for measuring the moisture content of the lumber contains the installation plate 1 with grooves under the rods 2 sensors 3 weight based on strain gauges, weight sensor consists of a shaft 2 mounted in the housing 4, United with him through the membrane 5, the membrane of RA the rod 2, made on the base 7 and the cover 8 of the housing 4.Sensors 3 weight placed on podstrelennoy cart 10 that is installed on the inlet railway tracks 11 of the drying chamber 12, and is connected via a plug connector 9 system 13 measurements. The sensors are installed on podstrelennoy cart 10 in points 14 of the fastening.Measuring device for determining the moisture content of lumber, as shown in Fig. 4, includes a measurement unit 15 and the switching adder block 16, block 17 approximation, the differentiator 18, block-identifier 19 final drying time, the block identifier 20 ultimate mass stack, block-identifier 21 equilibrium moisture content, unit 22 for calculating the current moisture content of the lumber, block 23 registration unit 24 of the control counter 25 time unit 26 for calculating the current mass of the pile. The output unit 22 for calculating the current humidity is associated with a block 23 of the Desk, and the three inputs are connected with the corresponding outputs of the block-identifier 21 equilibrium moisture, block-identifier 20 of the final mass of the pile and the output of the block-identifier 26 of the current mass of the pile, the first input through the meter 25 time associated with the block 24 of the control, the second input is connected with the output unit 17 of the approximation, posledovatelnostei 20 ultimate mass stack the second input is connected with the output unit 17 of the approximation, the input of which is connected with the output of adder 16, and the input unit 16 of the adder are connected to the corresponding outputs of the sensors 3 weight through the block 15 measurements and switching, connected to the unit 24 of the control.The device for determining the moisture content of the lumber is carried out as follows.Determination of moisture content of lumber carried out by weighing. With this purpose, set the stack 27 on plate 1, through which the rods 2 affects membrane 5 sensors 3 weight, causing them to SAG, accompanied by a change in resistance of the strain gages 6, which creates in the electric circuit of the sensor 3 weight change of the electric signal proportional to the magnitude of the applied load, which is fixed in the measuring system 13. On the basis of the change in resistance of the strain gages 6 determine the amount of load sensors 3 weight as necessary drying time. The electrical signal from the sensors 3 weight through the plug 9 is fed into the system 13 measurements.To eliminate excessive transverse and axial loads on the sensors 3 weight in the construction of the housing 4 is provided by the stops will limit the Gent, which pipe 29 away from the camera.A device for determining the moisture content of the lumber is as follows.After warming up the pile of lumber on the command unit 24 controls include counter 25 time and the switching unit 15 and dimensions through which is periodic connection system 13 to the sensors 3 weight. After specified periods of time the electrical signals from the sensors 3 weight through block 15 switching and measurements flow in the adder 16, which calculate the average mass of the pile of lumber in a given time. Three or four mass values in block 17 of the approximation calculate the power-law polynomial dependence of the current mass of the pile from drying time, which differentiate in the block 18 to determine the equation of the drying rate, in block 19 solve the equation drying rate and calculate the final drying time of the stack, the value is entered in block 20, where I expect the final mass of the pile. Estimated current weight of the pile is determined in block 26, the input of which receives signals from the counter 25 time block 17 approximation.The calculation of the value of the current moisture content of the lumber produced in block 22, wssi pile, and from the block 21 a signal corresponding to the equilibrium moisture content of lumber. The current moisture content of lumber in the stack is carried out in block 23.The device allows you to set the current moisture content of lumber during drying chamber, and if necessary to carry out the adjustment calculated in the initial period of drying humidity values of lumber on the basis of measurements of the mass of the pile in the middle of the drying process, which significantly increases the reliability of the measurements. A DEVICE FOR determining the MOISTURE content of LUMBER containing a weight sensor, a recording unit and a control unit, characterized in that it comprises a measurement unit and a switching unit adder unit approximation, the differentiator, the unit-determinant of the final drying time, the unit-determinant of the final mass of the pile, the block identifier of the current mass of the pile, the time counter, the unit-determinant of the equilibrium moisture content, unit-determinant of the current moisture content of the lumber, and the unit of measurement and switching is connected to the first output control unit, and a weight sensor, and outputs to the inputs of the block adder, the output of which is connected with the block approximation, the first output of which is directly connected to the inputs of unit-determinant of the final mass of the pile, the output of which is connected to the first input unit for calculating the current humidity to the second input of which is connected the unit-determinant of the equilibrium moisture content, and the output unit calculating the current humidity is associated with the registration unit, the second output control unit through the time counter connected to the first input unit calculating the current mass of the pile to the second input of which is connected to the third output block approximation, and the output unit calculating the current mass of the pile is connected with the third input unit for calculating the current humidity.
FIELD: vacuum sublimation drying of thermolabile products; microbiological, medical, pharmaceutical and food-processing industries.
SUBSTANCE: proposed method includes measurement of pressure in line supplying product to drier; in case this pressure exceeds permissible level, delivery of liquid product to drier is discontinued; method includes also creation of required residual sublimation pressure in drier housing and delivery of cooling agent heated in second stage of compressor to drum tubes; under action of heat of this agent desublimation of moisture from frozen product takes place and simultaneously upon completion of filling the drum product is charged and dried in second drum drier; termination of drying process is determined by relationship of temperatures of cooling agent at inlet and outlet of drum; then, cooling agent taken from pipe line between heat exchanger and desublimator is fed to drum; at throttling of this agent, temperature of drum tube surfaces in thermostatic control valve drops and desublimation pf moisture takes place; this moisture is removed from product in second drum; after blocking the perforations of second drum by desublimated moisture liquid product is introduced into its inner cavity; termination of blocking the holes is determined by rise of temperature inside perforated drum above permissible level; delivery of liquid product to drum is discontinued after critical magnitude of pressure in line supplying the product to drier has been attained and cooling agent heated in compressor is fed to tubes of revolving drum for repeated cycle of drying by above-mentioned algorithm; desublimators are changed-over for regeneration at maximum permissible thermal load on desublimators determined by thickness of desublimate on tube surfaces; provision is made for correction of flow rate of cooling agent in supply, lines, discharge lines and lines supplying it to condenser.
EFFECT: enhanced accuracy of control; possibility of using hot cooling agent.
2 cl, 1 dwg
FIELD: drying thermolabile materials.
SUBSTANCE: method comprises measuring initial and final humidity of the product at the dryer inlet and outlet, respectively, temperature of the product at the outlet of the drum of the drier, temperature of coolant at the inlet and outlet of the desublimator, maintaining the residual sublimation pressure by discharging water vapor from the sublimation chamber, stabilizing current value of heat flux from the surface of the evaporator of the desublimator by changing power of the cooling machine compressor drive, measuring the flow rate of the product in the supplying pipeline, speed of rotation of the drum, and extent of its filling, residual pressure in the desublimators and temperature of coolant at the outlet from the desublimators and in the pipeline for supplying to them the hot coolant, and varying the flow rate of the product in the pipeline for supplying it to the dryer when the final humidity of the product at the outlet from the drier deviates from a given one until the extent of the drum filling reaches a permissible value and then the speed of rotation of the drum until the final humidity reaches a given value.
EFFECT: reduced power consumption and expanded functional capabilities .
FIELD: wood-working industry.
SUBSTANCE: the index of drying and control are conducted directly according to moisture-content of the board wood, the present value of the wood moisture content is determined in the upper layer of the board and in the middle of the section in the board thickness, and according to their difference, the parameters of the drying agent is adjusted.
EFFECT: enhanced quality of drying.
FIELD: automation of brick drying.
SUBSTANCE: the automatic brick drying check-out system has a drying chamber, truck for brick feed to the drying chamber, hot air feed air conduit, cold air feed air conduit, cold-air damper, hot-air damper, mixer of hot and cold air, automatic control system, which has strain gauges, strain gauge amplifier, brick weight comparing unit, weight reduction set-point unit, temperature comparing unit, temperature-sensitive unit, error-correcting unit, hot-air damper control drive amplifier, cold-air damper control drive amplifier, hot-air damper control drive, cold-air damper control drive.
EFFECT: enhanced capacity and quality of brick drying.
FIELD: the invention is designed for automatic control of a drying process and may be used at automatization of barley malt drying process.
SUBSTANCE: the mode is in that a wet product is preliminary heated with a flow of processed drying agent with following drying and cooling. The drying of the product is executed in three drying zones with following cooling, with using of a heat pumping installation fulfilled two-stage. At that after preliminary heating of wet product the processed drying agent is successively directed at first into the evaporator of the second stage and into the evaporator of the first stage of the heat pumping installation and then into a heat-exchanger-recuperator which is installed on the flow of the drying agent between the evaporator and a condenser of the first stage of the heat pumping installation and further into a condenser of the first stage of the heat pumping installation. At that its one part is directed into the condenser of the second stage of the heat pumping installation with following feeding into the third drying zone and the other part into the first drying zone and the flow of the drying agent into the second drying zone is received by way of mixing of the part of the drying agent fed into the first and the third drying zones, additionally the temperature of the product is measured in the drying zones and the air temperature is measured after cooling, in accordance with received information about the temperature of the product in the drying zones one can determine consumption , temperature of the drying agent fed in the zones by way of influencing on the power drives of the compressors of the first and the second stages of the heat pumping installation, a ventilator drive and correlation of the flows of the drying agent fed in the first and in the third drying zones. In accord with the measured temperature of the product after cooling consumption of cooling air feeding in the heat-exchanger-recuperator. Stabilization of final moisture of the product is fulfilled by way of changing time of presence of the product in the dryer.
EFFECT: increases quality and energy effectiveness of a drying process.
FIELD: agricultural engineering.
SUBSTANCE: invention relates to measuring facilities, in particular, to technology and means of checking grain moisture in flow of grain in drier at automatic control of drying process by measuring capacitance. Method of automatic checking of grain moisture in flow of grain in drier comes to measuring current content of grain by capacitive pickup-moisture meter, correcting moisture content depending on influence of external factors, and, when certified moisture is attained, discharging of grain from drier and if grain moisture content exceeds certified value, stopping of discharge of grain and continuing drying of grain. Current value of grain moisture content is found by determining current value of analog signal according to handled grain material from formula: Vi = KX(Wi-Wmin) where Vi is current value of analog signal, M; K is moisture-to-analog signal transfer coefficient, M/%; Wi is current value of moisture of rain material under checking, %; Wmin is minimum value of moisture of handled grain material, %. Device for automatic ally checking grain moisture in flow of grain in drier has housing with capacitive pickup-moisture meter connected with measuring circuit of indicator unit, microprocessor and correction unit, microprocessor feedbacks connected with grain drier drive and display with grain selector unit connected with microprocessor proposed invention improves accuracy of checking of moisture content in grain flow without delay of moisture signal, accuracy of control of grain drying process, and it provides increase of capacity owing to intensification of drying process, improves quality of dried product, reduces specific expenses and provides ecological efficiency of process.
EFFECT: improved reliability of checking.
SUBSTANCE: method comprises measuring the temperature of the exhaust drying agent which made of a flue gas, final humidity, and initial humidity. The rate of feeding of the material to be dried changes depending on its final humidity. The temperature of the material at the output of the drier is determined from the value of the temperature of the drying agent, initial humidity, and the rate of movement of the sheet material. The predicted values are compared with the specified values. When the value of the predicted temperature exceeds the specified value at a humidity below the specified one, the temperature of the drying agent is decreased, the flow rate of the drying agent is reduced, and the rate of feeding of the sheet material is increased.
EFFECT: enhanced quality of drying and lowered inflammability.
SUBSTANCE: method comprises supplying fuel to the first zone of control keeping a specified ratio of the flow rates of fuel and water containing in the material to be dried and supplied to the drum for evaporation. The fuel flow rate is changed with a time delay to the change of the water flow rate according to the equation proposed.
EFFECT: enhanced quality of drying.
FIELD: food, chemical and allied industries.
SUBSTANCE: proposed method of automatic control of drying process in drier under active hydrodynamic conditions comes to changing of flow rates of flow rates of initial material and heat carrier by control signal. Signals are received from sensors measuring moisture content, temperature and consumption of drying agent before and after drier, initial and dried product, sensors measuring power consumed by fans and air heaters and all signals are supplied to microprocessor. The latter continuously determines sign of derivation of function of summary cost of energy and material per unit of mass of material under drying and if sign is positive, it reduces flow rate of initial material, and if sign is negative, increases the flow rate. Correction of drying process control conditions is effected in two levels. At first level, if current value of flow of moisture evaporated in some zone of drier differs from preset value, action is made on temperature and flow rate of tangentially delivered flow of drying agent, and at second level, if change of temperature and flow rate of tangentially delivered flow of drying agent does not provide required moisture content in dried material, action is made additionally on flow rate and temperature of axial flow of drying agent.
EFFECT: improved quality of drying, accuracy and reliability of control, reduced energy consumption.
SUBSTANCE: method comprises preliminary drying of initial product in the zone of the preliminary drying by heated air, drying the product by overheated steam in the drying zone, measuring flow rate and humidity of the initial product, flow rate and temperature of the preliminary dried product entering the drying zone thus correcting the flow rate and temperature of the overheated steam at the entrance to this zone, flow rate and humidity of the dried product, flow rate and temperature of the overheated steam at the entrance to the drying zone, flow rate of the air supplied for preliminary drying and humidity of air at the exit from the preliminary drying zone, and determining excess portion of the overheated steam from the current data on the flow rate of the preliminary dried and dried products. The device comprises heat pump plant composed of compressor, condenser, heat control valve, two-way switch, and evaporator that has operation and reserve section.
EFFECT: enhanced efficiency and expanded functional capabilities.
FIELD: measurement technology.
SUBSTANCE: sample is taken and is allowed to settle, after it the hydrostatic pressure is measured. Time for which ultrasonic pulse passes through layer of settled water is measured additionally. Mass concentration W of water is defined from ratio W = g ρw Cw(t1-t0)/2ΔP, where g is free fall acceleration, ρw is density of water after temperature and pressure reached the steady state, Cw is speed of sound in water medium, ΔP is hydrostatic pressure, (t1-t0) is time interval during which direct and reflected ultrasonic pulses pass. Device for measuring content of water has water-tight casing (vessel for taking samples) provided with pressure, temperature and hydrostatic (differential) pressure detectors. Acoustic transformer intended for receiving and irradiating ultrasonic pulses should be mounted at bottom side of casing.
EFFECT: increased precision of measurement.
4 cl, 1 dwg
FIELD: oil industry.
SUBSTANCE: method includes measuring flow and density of liquid, used for preparation of mixture for hydraulic fracturing of bed, measuring flow and density of mixture of liquid with proppant at output from mixture preparation machine. Current value of mixture density is measured in some time after delay, equal to time of passing of a portion of liquid through mixture preparation machine. On basis of results of measurements of these parameters current value of volumetric concentration of proppant C and mass share of proppant X in the mixture are calculated using formulae:
where ρpr - mineralogical density of proppant; ρl - current value of liquid density; ρpil - piled density of proppant; ρmix - current mixture density value; Θ - mixture volume increase coefficient during mixing of liquid with proppant and chemical reagents.
EFFECT: higher precision.
4 cl, 7 dwg, 1 tbl
FIELD: aviation industry.
SUBSTANCE: device helps to get real pattern of liquid pressure distribution which flows about "blown-about" object in water tunnel. Device has driven frequency pulse oscillator, frequency divider, control pulse counter, longitudinal contact multiplexer which connect capacitors with shelves, lateral contact multiplexer which connect the other output of capacitors, matching unit, analog-to-digital converter, indication unit, water tunnel, blown-about object, grid with capacitive detector.
EFFECT: improved precision of measurement.
FIELD: oil and gas industry, particularly survey of boreholes or wells.
SUBSTANCE: device has working chamber, pressure and temperature control means, impulse tube to which differential pressure transducer is connected. Impulse tube is filled with reference fluid and connected to above working chamber in points spaced apart in vertical direction along working chamber. Upper part of working chamber is connected to access hole of wellhead. Lower end thereof is communicated with atmosphere.
EFFECT: increased efficiency and accuracy of water content determination.
FIELD: technology for determining moisture load of solid materials, possible use for construction, chemical and other industries.
SUBSTANCE: UHF method for determining moisture load of solid materials on basis of Brewster angle includes positioning researched material into high-frequency electromagnetic field with following registration of parameters alternation, characterizing high-frequency emission. Ring-shaped multi-slit antenna with electronic-controlled direction diagram excites electromagnetic wave, falling onto dielectric material. Direction diagram inclination angle is measured until moment, at which minimal power of reflected wave is detected, wave length of UHF generator is determined and Brewster angle is calculated. Then on basis of normalized mathematical formulae moisture load value of surface layer of Ws is calculated for measured material. Further, power of refracted wave is stabilized by changing power of falling wave, temperature of subject material T1 is measured, and after given time span - temperature T2 and moisture level are determined for volume of material from given mathematical relation. Device for realization of given method includes UHF generator, UHF detector, wave-guiding Y-circulator, input shoulder of which has generator block controlled by voltage, attenuator, controlled by central microprocessor unit, UHF watt-meter with output to central microprocessor unit device for controlling and stabilization of output power, diode pulse modulator and video pulse generator, controlled by central microprocessor unit, peak detector. First output shoulder of Y-circulator has absorbing synchronized load, and second output shoulder has complex cone antenna, consisting of emitting portion in form of ring-shaped multi-slit antenna and cone-shaped receipt portion, to which gate is connected as well as second UHF watt-meter, connected to extreme digital controller for searching and indication of power minimum of returned wave and resonator indicator of wave meter. UHF generator is powered by central microprocessor unit controlled power block, video pulse counter is connected to digital wave meter, and thermal pairs block is connected to central microprocessor unit device.
EFFECT: increased sensitivity, increased precision of measurement of moisture load of surface layer, expanded functional capabilities due to additional determination of integral moisture load on basis of interaction volume and decreased parasitic UHF emission.
2 cl, 3 dwg
FIELD: chemical industry; methods of determination of acetic acid concentration.
SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to the method of determination of acetic acid concentration in a broad band of temperatures. The technical result is an increased accuracy at determination of concentration of acetic acid within the range of temperatures from 0° up to 40°C. The offered method allows using the linear interpolation to determine dependence of density on the concentration and the temperature in 1°C within the range of temperatures from 0°C up to 40°C according to the known dependence of density from concentration over the range from 0 up to 100 % and on the temperature - from 0°C up to 40°C in 5; 10°C. Then they homogenize the solution and determine the temperature of the solution in the pressure tank with accuracy 0.1°C and the density. At the integer values of the temperature using the received dependence determine two values of density that are the most close to the experimental values and two values of concentration corresponding to them and determine the first derivative from concentration according to the density. If |dc/dp | ≤ 3.3*10, the concentration is determined by the linear interpolation method according to the received dependence of density on concentration with accuracy up to 0.1 %. If |dc/dp |> 3.3*103, then into pressure tank inject water in a such amount that to get into the zone of |dc/dp | <3.3*103 for determination of concentration of the acetic acid. In the case of non-integral values of the temperature it is necessary to conduct the following operations: for the most close to the experimental integer value of the temperature select two values of density the most close to the experimental value of density and corresponding to them two values of concentration. Using the received dependence of the density on the temperature find two values of density at the temperature of the experiment and determine the first derivative from concentration on the density, and then the operations are iterated as for the integer value of the temperature.
EFFECT: the invention ensures an increased accuracy at determination of concentration of acetic acid within the range of temperatures from 0° up to 40°C.
5 ex, 4 tbl, 3 dwg
FIELD: possible use for determining water presence level in product of oil wells.
SUBSTANCE: method for measuring mass concentration of water in water-oil-gas mixture includes taking of a sample of water-oil-gas mixture in hermetic cylinder-shaped vessel with given volume V and height H and measurement of hydrostatic pressure P1 at fixed values of temperature T and pressure Pa in aforementioned vessel. After measuring of hydrostatic pressure volume of vessel hollow is decreased until full solution of gas and hydrostatic pressure P2 is measured, and mass concentration of water W in water-oil-gas mixture is determined in accordance to mathematical expression , where g - free fall acceleration.
EFFECT: improved precision of measurements of mass concentration of water in liquid due to prevented influence of gas separation.