Device for measuring concentration of loose material in pipeline

FIELD: investigating or analyzing materials.

SUBSTANCE: device comprises measuring section made of dielectric pipe whose inner diameter is equal to the inner diameter of the pipeline, two electrodes which form a capacitor made of segments of the dielectric pipe, mounted diametrically opposite, and connected with the electronic unit. The electronic unit has a self-excited oscillator whose frequency-generating circuit includes the capacitor and device for processing frequencies with the indicator. The electrodes are arranged inside the dielectric pipe of the measuring section. The transverse length of each electrode can be greater than half inner diameter of the pipeline. The longitudinal length of each electrode may not exceed half length of the dielectric pipe.

EFFECT: enhanced sensitivity.

2 cl, 1 dwg

 

The invention relates to measuring technique and can be used for high-precision determination of the concentration of various bulk materials transported through pipelines. In particular, it can be used to control operation of the pneumatic transport of bulk materials, including to determine the concentration, mass of the transported substance, flow, control, clogging of piping bulk material. The field of its possible applications - food industry (flour for bakeries), construction materials (cement), energy (powdered coal) and other

Known devices for determining the concentration of material transported through pipelines (ed. mon. The USSR N913208, M. CL. G 01 N 27/02; European Pat. N0308004, M. CL. G 01 N 27/22). They are based on the measurement of electrophysical parameters (permittivity, conductivity) of the controlled substances and functionally connected with the concentration of the substance.

It is also known technical solution (article in the journal: Journal of Physics E: Scientific Instruments. 1985. Vol. 18. N7. R-592), which contains the device description, the technical essence is the closest to the proposed device and is taken as a prototype. This device is a prototype contains a set of two electrodes placed on the surface of the dielectric is historical pipe on the measuring section of the pipeline. These electrodes form an electrical capacity and have a shape that mirrors the shape of the pipeline. These electrodes are located either on the outer surface of the specified dielectric tube or on the inner surface, while in the latter case, in direct contact with the controllable material. A disadvantage of this device prototype is a low accuracy due to, firstly, low sensitivity (external to the pipe arrangement of the electrodes), and secondly, low accuracy (when the internal arrangement of the electrodes). In the latter case, the accuracy may decrease due to the impact on the results of measurement of the variable conductivity of the controlled material when testing materials (in particular, moisture-containing materials), which is imperfect dielectrics.

The aim of the invention is to increase the sensitivity and accuracy of measurement.

The goal in the proposed device for measuring the concentration of the bulk material in the pipeline containing the measuring section in the form of a dielectric tube with an inner diameter equal to the inner diameter of the tubing forming the electric capacity of the two electrodes, which are made on the shape of the segments of the dielectric pipes, installed diameter is Ino opposite and connected to the electronic module, is achieved in that the electronic unit has consistently United oscillator, customizados circuit which included specified electrical capacity, and the processing device frequency indicator, and the electrodes are placed inside a dielectric tube of the test section. The transverse length of each electrode may be greater than half the inner diameter of the pipeline. The longitudinal length of each electrode can be no more than half the length of the dielectric tube.

A distinctive signs, according to the authors, is, first, the specified electric capacity included in customizados circuit of the oscillator; secondly, both electrodes are placed ("drowned") inside the dielectric tube of the test section of the pipeline; thirdly, the transverse size of each electrode can be more than half of the internal diameter of the pipeline, i.e. not less than πD/6, where D is the internal diameter of the pipeline; fourth, the longitudinal length of each electrode can be no more than half the length of the dielectric tube.

The set of distinctive features of the proposed device makes it new properties: measurements without disturbing the dynamics of the bulk material flow while providing high sensitivity to the concentration of kontroliruemoe material and its changes.

This property provides a useful effect, formulated in the objectives of the proposals.

The figure schematically shows a diagram of the proposed device (shown in cross-section of the measuring section of the pipeline). Here we have introduced the notation: 1 - pipe; 2 - dielectric tube; 3 and 4 - electrodes; 5 and 6 - wires; 7 - electronic control unit; 8 - inductance, 9 - oscillator; 10 - frequency.

The device operates as follows. On the measuring section of the pipeline 1, which moves controlled granular material, installed the dielectric tube 2 with the same internal diameter as the pipe 1. It doesn't influence the dynamics of the bulk material flow. Inside this pipe 2 is installed ("drowned") diametrically opposite to the two electrodes 3 and 4, which are made in the form of a concave surface segments of pipe (or pipes 2). They form an electrical capacitance, the value of which is a function of the concentration of floating granular matter. The choice of the depth of immersion of the electrode in the tube material 2, and their longitudinal and transverse dimensions, you can adjust the sensitivity of the sensor to the concentration of the material. Experiments show that it is reasonable (from the point of view of high sensitivity of the sensor) to choose poperen is th length of each electrode depending on the size of the pipe cross section, the corresponding Central angle θ not less than 60° (figure 1), and the longitudinal length of each electrode is not more than half the length L of the dielectric tube. Central corner θ corresponds to the arc length l=πDθ/360, where the angle θ recorded in degrees; D - inner diameter of tube 2. Therefore, the transverse length l of each electrode shall be not less than πD/6 (in units of the diameter D of, for example, in mm), i.e. more than half of the internal diameter of the pipeline.

When the transverse length of each of the electrodes 3 and 4, less than πD/6, reduced sensitivity due to the fact that the electric field does not cover all of the cross-section of the pipeline. This is particularly unacceptable when the incomplete filling of a pipeline section in a controlled substance.

The choice of the longitudinal length of each of the electrodes 3 and 4 is due next. When it is larger than L/2, the value increases the value of the electrical capacitance between the electrodes and the metal flanges of the test section of the pipeline. This, however, leads to undesirable redistribution of the electric field between the electrodes. Namely, the energy of the electric field is reduced in the Central part of the cross-section; the electric field lines are bent in the direction of the flanges.

The electrodes 3 and 4 are connected one-way ends with will connect the selected conductors 5 and 6 to the electronic unit 7. It contains the oscillator 8, customizados circuit which included an electric capacitance formed by the electrodes 3 and 4 and the inductance 8. These capacitance and inductance to form a resonant circuit, the resonant frequency of which depends on the measured concentration of the bulk material. To the output of the oscillator 9 is connected to the frequency counter 10, on whose testimony the judge about the desired concentration. The choice of frequency of the oscillator in

as an informative parameter of the device provides high accuracy of its determination and, consequently, the measured concentration of the bulk material.

This factor, as well as the absence of contact of the electrodes with the material and their location in the interior of the pipe section 2 provides no influence on the dynamics of flow while maintaining the high sensitivity of the device, characterized by the advantages of this device compared to the prototype. The possibility of changing the depth of immersion of the measuring electrodes 3 and 4 in the dielectric tube 2 allows, in contrast to the prototype, to control the sensitivity of the device to the measured concentration including the electrophysical parameters of a controlled substance.

For example, the parameters of the elements of the device in question may be the following. Tube 2, made of Teflon, has the following size is s: internal diameter of 60 mm, outer diameter of 100 mm Pipe 1 made of metal or dielectric has the same dimensions. Two copper electrodes 3 and 4 having a thickness of 1 mm, the longitudinal and transverse length of 40 mm, is installed in the pipe 2 at a depth of 2 mm or 3 mm from the inner surface of this pipe. Flat copper electrodes 5 and 6 have a width of 10 mm Coil inductance 8 PTFE diameter of 30 mm has a 2.5 coil of copper wire. When this sensor design in customizados circuit of the oscillator 9 of his generation frequency is 120 MHz in the absence of material in the pipe 2. The oscillator circuit includes a power source 5 C. the Output signal (frequency) of the oscillator is fed into the processing unit frequency 10. It involves measuring the current value of the frequency of the oscillator, the computation of the difference between this frequency and the source (in the absence of material) frequency of the oscillator. This frequency difference is a function of the measured concentration of the bulk material. She, in turn, depends on the electrophysical parameters (permittivity, conductivity) of the controlled material. When the flow control flour changing the frequency actually decreases to about 110 MHz with full consideration of the pipeline. Determining the value of this frequency, it is possible, in particular, control the th degree of filling of the pipeline bulk material, for example, flour, to signal the termination (stop) flow caused by the clogging material. Depending on the controlled material design parameters of the device are selected within the specified ratios of the sizes of the electrodes 3 and 4 of the sensor and the dielectric tube 2.

Thus, the proposed device provides high sensitivity to measured concentrations (due to the design parameters of the sensor), high accuracy (due to the choice of informative parameter of the device). It can be applied in various technological processes for high-precision, rapid determination of the concentration of the bulk material transported by pipeline, for controlling the operation of pneumatic, and devices for determining mass flow roaming loose materials. Also it can be used to determine the current values of physical parameters (density, concentration and the like) of liquids in pipelines.

1. Device for measuring the concentration of the bulk material in the pipeline containing the measuring section in the form of a dielectric tube with an inner diameter equal to the inner diameter of the tubing forming the electric capacity of the two electrodes, which are made on the shape of the segments of the dielectric tube, set the go diametrically opposed and connected to the electronic module, characterized in that the electronic unit has consistently United oscillator, customizados circuit which included specified electrical capacity, and the processing device frequency indicator, and the electrodes are placed inside a dielectric tube of the test section.

2. Device for measuring the concentration of the bulk material in the pipeline according to claim 1, characterized in that the transverse length of each electrode is equal to, greater half the internal diameter of the pipeline.

3. Device for measuring the concentration of the bulk material in the pipeline according to claim 1, characterized in that the longitudinal length of each electrode is not more than half the length of the dielectric tube.



 

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