A foaming detection device for desulfurization slurry in thermal power plants

Abstract

The invention discloses a desulfurization slurry foaming detection device for a thermal power plant, and relates to the technical field of desulfurization slurry foaming detection tools for thermal power plants, including an ultrasonic generator. The invention facilitates the emission of ultrasonic waves of a constant frequency through the cooperation of an ultrasonic generator and a sound-generating component, and has the ability to detect medium density and to provide real-time feedback on the density of the desulfurization slurry, thereby solving the problem of delayed feedback of the detection equipment. The detection module in the sound-generating component accurately calculates medium density data according to ultrasonic attenuation speed, and through the steps of constructing a fluctuation range, preparing a standard sample, and accurately matching an attenuation coefficient, the interference of solid particles is deeply analyzed and effectively eliminated, and the real density of the medium is accurately determined. When determining the density of the medium, the influence mechanism of the water content is carefully analyzed, and an ultrasonic propagation speed formula containing a water content variable is constructed. By monitoring and calculating the water content, the detection result is dynamically calibrated, and the medium density detection under different water contents is ensured to be accurate and correct.

Description

Technical Field

[0001] The invention relates to the technical field of desulfurization slurry foaming detection tools for thermal power plants, in particular to a desulfurization slurry foaming detection device for thermal power plants. Background Art

[0002] In the desulfurization chemical reaction, some reaction products are gases, and their generation rate is directly related to the progress of the reaction. The degree of foaming can be used as an intuitive representation of the gas escape amount and generation rate. At present, the foaming degree of the desulfurization slurry is mainly judged by ultrasonic detection of the slurry density.

[0003] In actual operation, when ultrasonic waves propagate in a medium, they are affected by solid particles in the medium, causing strong scattering, which increases ultrasonic energy loss and weakens the signal strength received by the receiving end. Scattering in different directions changes the propagation path of the ultrasonic waves, causing distortion of the signal received by the receiving component, affecting the accurate judgment of the medium density.

[0004] When the water content of the slurry changes, the propagation speed and attenuation of the ultrasonic wave in it will also change. A higher water content in the medium will make the ultrasonic wave more susceptible to interference from other particles and components during the propagation process.

[0005] In a high-temperature slurry environment, the propagation speed of ultrasound increases. Under higher pressure, the density of the liquid medium will increase, and the propagation speed of ultrasound will also change. The staff did not notice the changes in temperature and pressure in time, and calculated the density according to the calibration parameters at normal temperature and pressure, resulting in large errors and affecting the accuracy of the calculated data.

[0006] Therefore, the present invention makes improvements to the above problems. Summary of the invention

[0007] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a desulfurization slurry foaming detection device for a thermal power plant.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a desulfurization slurry foaming detection device for a thermal power plant, comprising an ultrasonic generator, a plurality of transmission ports are provided on the bottom surface of the ultrasonic generator, one end of a wire is connected to the transmission port, the other end of the wire is rotatably connected to a connector, the connector is connected to a sound-generating component, the sound-generating component is sleeved on a water pipe, and the sound-generating component is symmetrically provided with a sound-receiving component on the water pipe.

[0009] Preferably, the sound emitting component and the sound receiving component are arranged in a device shell.

[0010] Preferably, the sound-generating component includes a connecting head, a front end of which is provided with an external thread, and the connecting head is screwed on the rear end of the directional sounder through the external thread, the front end of the directional sounder is connected to a rear stabilizing plate through a conduction rod, the front end of the rear stabilizing plate is fitted and abutted against the outer side of the water pipe, and flanges are fixedly connected to the upper and lower ends of the water pipe.

[0011] Preferably, the sound collecting component includes a front stabilizing plate, which is arranged at an axially symmetrical position with respect to the rear stabilizing plate in the water pipe, the front end surface of the front stabilizing plate is connected to a display via a conductive column, a sound wave receiver is arranged in the display, a circuit board is connected to the back of the sound wave receiver, and the left and right sides of the circuit board abut against the inner side of the device shell.

[0012] Preferably, a detection module is provided inside the sound generating component, and the analysis steps for determining data abnormality by the detection module are as follows:

[0013] Step 1: The detection signal transmitted by the receiving sound receiving component due to the interference of ultrasonic propagation is determined. The density data of the medium in the pipeline is determined by the attenuation speed of the ultrasonic wave after passing through the pipeline and the medium inside the pipeline. The sound pressure Px=P0*E at the position x away from the starting position of the wave source when the ultrasonic wave propagates, where P0 is the sound pressure at the starting position of the wave source, the exponent of the natural logarithm e is -ax, recorded as E, and a is the attenuation coefficient;

[0014] Step 2: The frequency of ultrasound is f, the propagation speed of sound waves in the medium is v, and the viscosity coefficient of the medium is B. Then the density data of the medium is calculated as pt=8π*π*f*f*B / aj*v*v*v, where aj is the mean value of the attenuation coefficient;

[0015] Step 3: Taking the inferred medium density data pt as the middle value, expand the preset fluctuation range p0 on both sides to establish the fluctuation range of the medium density data [pt-p0, pt+p0]; taking the lowest bit of the medium density data as the reference, establish the density interval of the corresponding size, prepare the standard medium sample with the corresponding density interval, and then measure the ultrasonic sound pressure attenuation data of the standard medium samples with different densities, and calculate the attenuation coefficient to obtain the attenuation coefficient set of the ultrasonic wave propagating in the medium with different densities;

[0016] Step 4: Match the density attenuation coefficient corresponding to the inferred medium density data with the attenuation coefficient set, calculate the ratio of the inferred density attenuation coefficient data to each data in the attenuation coefficient set, then subtract the calculated ratio from data 1, and find the absolute value of the difference, select the minimum value in the absolute value data, and determine that the medium density data corresponding to the minimum value is the detected medium density data pj; compare the detected medium density data pj with the inferred medium density data pt. If pt=pj, then determine that the density data of the medium in the pipeline is pj; otherwise, analyze the propagation speed of ultrasonic waves in the medium.

[0017] Preferably, the steps for analyzing the propagation speed of ultrasonic waves in a medium are as follows:

[0018] Step 1: The propagation speed of ultrasonic waves in a medium without solid particles is v0. The mass data of solid particles contained in the medium per unit time is obtained by dividing the pressure change value of the filter per unit time by the pressure increase value of the filter caused by each gram of solid particles. The weight coefficient of each solid particle is preset, and then the weight coefficient of each solid particle is multiplied by the density data of the corresponding solid particle, and the sum is obtained to obtain the comprehensive density data. The ratio of the mass data of solid particles contained in the medium per unit time to the comprehensive density data is the volume data of solid particles contained in the medium per unit time, and the ratio of the volume data of solid particles to the pipeline flow data, that is, the volume fraction VT of solid particles in the medium;

[0019] Step 2: The influence coefficient of the number of solid particles in the pipeline on the propagation speed of ultrasound in the medium is recorded as vgt. There is the following relationship between vgt and v0. The propagation speed of ultrasound in the medium containing solid particles is vjc1, and vgt is calculated; the water content in the medium will affect the propagation speed of ultrasound in the medium. The propagation speed of ultrasound in water is vs. The propagation speed of ultrasound in water-containing medium is vjc2=hs*vs+(1-hs)*v0, where hs is the water content in the medium; the temperature and pressure of the medium will both affect the propagation speed of ultrasound in the medium. The propagation speed of ultrasound at the set temperature is vw. The propagation speed of ultrasound in the medium with different temperature data wd is vjc3=vw+a*wd+b*wd*wd. The propagation speed of ultrasound in the medium with different pressure data yl is vjc4=2K*vy+yll / 2K, where yll is the pressure change, K is the bulk elastic modulus of the medium, and vy is the propagation speed of ultrasound under the initial pressure.

[0020] Preferably, the steps for determining the medium density after comprehensive consideration of the influencing factors are as follows:

[0021] Step 1: Process the historical data within the set time range of the medium flow at the pipeline location, analyze the change range of solid particles, moisture content, temperature and pressure data, and preset the weight coefficients r1, r2, r3 and r4 corresponding to the solid particles, moisture content, temperature and pressure according to the change range. Then, the influence coefficient of solid particles, moisture content, temperature and pressure on the propagation speed of ultrasonic waves in the medium is vc=r1*vgt+r2*vjc2+r3*vjc3+r4*vjc4;

[0022] Step 2: Calculate the difference between the propagation velocity of the sound wave in the medium v ​​and the influence coefficient vc of the propagation velocity in the medium, and update the density data of the medium to pt1 according to the difference.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] Through the cooperation of the ultrasonic generator and the sound-generating component, it is convenient to emit ultrasonic waves of a constant frequency into the pipeline, thereby improving practicality and realizing the ability of the device to output ultrasonic signals. Through the cooperation of the sound-generating component and the sound-receiving component, it is convenient to judge the attenuation of the ultrasonic wave after passing through the water pipe, thereby realizing the ability to detect the density of the medium in the water pipe. Through the cooperation of the circuit board and the display, it is convenient to directly display the final information, thereby improving the practicality of the device, realizing the detection of slurry foaming by real-time monitoring of the desulfurization slurry density, and solving the problem of the need to monitor the density of the desulfurization slurry and the delay in the feedback of the detection equipment in wet desulfurization.

[0025] The detection module in the sound-generating component can accurately calculate the medium density data based on the ultrasonic attenuation speed, and through steps such as building a fluctuation range, preparing standard samples, and accurately matching the attenuation coefficient, it can deeply analyze and effectively eliminate the interference of solid particles, and accurately measure the true density of the medium. When measuring the medium density, the influence mechanism of moisture content is carefully analyzed, and a formula for ultrasonic propagation velocity containing moisture content variables is constructed. By monitoring and calculating the moisture content, the test results are dynamically calibrated to ensure accurate medium density detection under different moisture contents. It can effectively improve the accuracy of density detection of particle-containing media, lay a solid foundation for the stable advancement of the desulfurization process, ensure the accurate proportion of reaction materials, improve the utilization rate of desulfurization additives, and reduce equipment loss and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 This is a three-dimensional schematic diagram of the overall appearance of the device proposed by the present invention;

[0028] Figure 2This is a front view schematic diagram of the overall appearance of the device proposed by the present invention;

[0029] Figure 3 A schematic diagram of the overall appearance of the device proposed by the present invention;

[0030] Figure 4 A schematic diagram of the internal structure of the device proposed by the present invention;

[0031] Figure 5 A side cross-sectional diagram of the internal structure of the device proposed by the present invention;

[0032] Figure 6 It is a system structure diagram of the present invention.

[0033] Serial numbers in the figure: 1. ultrasonic generator; 2. wire; 3. connector; 4. directional sounder; 5. rear stabilizer; 6. water pipe; 7. front stabilizer; 8. circuit board; 9. display; 10. equipment shell. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Example: See Figure 1-6 A desulfurization slurry foaming detection device for a thermal power plant in the present invention comprises an ultrasonic generator 1, a plurality of transmission ports are arranged on the bottom surface of the ultrasonic generator 1, one end of a wire 2 is connected to the transmission port, the other end of the wire 2 is rotatably connected to a connector 3, the connector 3 is connected to a sound-generating component, the sound-generating component is sleeved on a water pipe 6, and a sound-receiving component is arranged at a symmetrical position of the water pipe 6. Through the cooperation of the sound-generating component and the sound-receiving component, it is convenient to judge the attenuation of the ultrasonic wave after passing through the water pipe 6, thereby improving the practicality; the sound-generating component and the sound-receiving component are both arranged in an equipment shell 10, and the equipment shell 10 is convenient for isolating external interference, thereby improving the practicality of the device; the sound-generating component comprises a connector 3, an external thread is arranged at the front end of the connector 3, the connector 3 is screwed on the rear end of a directional sound generator 4 through the external thread, and the front end of the directional sound generator 4 is connected to a rear stabilizing plate 5 through a conduction rod, and through the cooperation of the connector 3 and the directional sound generator 4, it is convenient to receive the signal of the ultrasonic generator 1, thereby improving the practicality.

[0036] The density data of the medium in the pipeline is determined by the attenuation rate of the ultrasonic wave after it passes through the pipeline and the medium inside the pipeline. The sound pressure Px=P0*E when the ultrasonic wave propagates to a position x away from the starting position of the wave source, where P0 is the sound pressure at the starting position of the wave source, the exponent of the natural logarithm e is -ax, denoted as E, and a is the attenuation coefficient. The thickness data HD of the inner wall of the pipeline and the pipe diameter data GR are detected, and the initial ultrasonic sound pressure data entering the medium is PHD, and the ultrasonic sound pressure data when it is transmitted from the medium is PGR. The sound pressure data of n ultrasonic waves during the propagation stage in the medium are randomly selected. The attenuation coefficient an represented by each stage of the ultrasonic wave propagation in the medium can be calculated through the sound pressure data. The calculated attenuation coefficient an is averaged to obtain the attenuation coefficient mean aj. The frequency of the ultrasonic wave is f, the propagation speed of the sound wave in the medium is v, and the viscosity coefficient of the medium is B, then the density data of the medium is deduced as pt=8π*π*f*f*B / aj*v*v*v

[0037] Taking the inferred medium density data pt as the middle value, the preset fluctuation range p0 is expanded to both sides to establish the fluctuation range of the medium density data [pt-p0, pt+p0]; taking the lowest bit of the medium density data as the reference, a density interval of corresponding size is established (i.e. when the density data is 1.23g per cubic centimeter, the lowest bit is 0.01, and 0.01g per cubic centimeter is used as the density interval), the fluctuation range of the medium density data is divided according to the corresponding density interval, and a standard medium sample with the same medium density data after division is prepared, and then the prepared standard medium samples with different densities are filled into the same pipe, the ultrasonic sound pressure attenuation data of the media with different densities are measured, and the attenuation coefficient is calculated to obtain the attenuation coefficient set of the ultrasonic wave propagating in the media with different densities;

[0038] The density attenuation coefficient corresponding to the inferred medium density data is matched with the attenuation coefficient set, and the ratio of the inferred density attenuation coefficient data to each data in the attenuation coefficient set is calculated. Then, the calculated ratio is subtracted from data 1, and the absolute value of the difference is obtained. The minimum value in the obtained absolute value data is selected, and the medium density data corresponding to the minimum value is determined to be the detected medium density data pj; the detected medium density data pj is compared with the inferred medium density data pt. If pt=pj, the density data of the medium in the pipeline is determined to be pj; otherwise, the propagation speed of ultrasonic waves in the medium is analyzed.

[0039] The solid particles in the medium will affect the propagation speed of ultrasound in the medium. The propagation speed of ultrasound in a medium without solid particles is v0. The flow rate data of the medium per unit time in the pipeline is detected, and the detected flow rate data is multiplied by the cross-sectional area inside the pipeline to obtain the flow data of the pipeline per unit time. A filter is installed in the pipeline. The aperture size of the filter can block solid particles, and a pressure sensor is installed on the filter. The pressure increase value of the filter caused by each gram of solid particles is preset. During the flow of the medium, the pressure change value of the filter per unit time is divided by the pressure increase value of the filter caused by each gram of solid particles to obtain the mass data of the solid particles contained in the medium per unit time. There are many types of solid particles in the medium. The residual amount of each solid particle in the medium is estimated according to the reaction time, and then each is measured according to the residual amount. The weight coefficient of solid particles is preset, and then the weight coefficient of each solid particle is multiplied by the density data of the corresponding solid particles, and the sum is obtained to obtain the comprehensive density data. The ratio of the mass data of solid particles contained in the medium per unit time to the comprehensive density data is the volume data of solid particles contained in the medium per unit time, and the ratio of the volume data of solid particles to the pipeline flow data is the volume fraction VT of solid particles in the medium; the influence coefficient of the number of solid particles in the pipeline on the propagation speed of ultrasonic waves in the medium is recorded as vgt, and vgt has the following relationship with v0. The propagation speed of ultrasonic waves in the medium containing solid particles is vjc1=v0*[(2VT*vo / vgt) / (1-VT*v0 / vgt)], and vgt=VT*v0*(2vo+vjc1) / (vjc1-v0) is calculated;

[0040] The water content in the medium will affect the propagation speed of ultrasound in the medium. The propagation speed of ultrasound in water is vs. The propagation speed of ultrasound in a water-containing medium is vjc2=hs*vs+(1-hs)*v0, where hs is the water content in the medium. The temperature and pressure of the medium will both affect the propagation speed of ultrasound in the medium. The propagation speed of ultrasound at a set temperature is vw. The propagation speed of ultrasound in a medium with different temperature data wd is vjc3=vw+a*wd+b*wd*wd. The propagation speed of ultrasound in a medium with different pressure data yl is vjc4=2K*vy+yll / 2K, where yll is the pressure change, K is the bulk elastic modulus of the medium, and vy is the ultrasonic propagation speed under the initial pressure.

[0041] The historical data within the set time range of the medium circulation at the pipeline location is processed, the change range of the solid particle matter, moisture content, temperature and pressure data is analyzed, and the weight coefficients r1, r2, r3 and r4 corresponding to the solid particle matter, moisture content, temperature and pressure are preset according to the change range. The influence coefficient vc of the solid particle matter, moisture content, temperature and pressure on the propagation speed of ultrasonic wave in the medium is vc=r1*vgt+r2*vjc2+r3*vjc3+r4*vjc4; the propagation speed of sound waves in the medium is calculated as the difference between v and the influence coefficient vc of the propagation speed in the medium, and the density data of the medium is updated to pt1 according to the difference, so as to more accurately analyze the progress of the reaction based on the detected slurry density.

[0042] In the present invention, the front end of the rear stabilizing plate 5 is fitted and abutted against the outer side surface of the water pipe 6, and flanges are fixedly connected to the upper and lower ends of the water pipe 6. Through the cooperation of the water pipe 6 and the flange, it is convenient to connect the desulfurization slurry circulation path, thereby improving stability; the sound collecting component includes a front stabilizing plate 7, and the front stabilizing plate 7 is arranged at a symmetrical position of the rear stabilizing plate 5 about the central axis of the water pipe 6. The front end surface of the front stabilizing plate 7 is connected to a display 9 through a conductive column, and a sound wave receiver is arranged in the display 9. A circuit board 8 is connected to the back of the sound wave receiver, and the left and right sides of the circuit board 8 abut against the inner side surface of the equipment shell 10. Through the cooperation of the circuit board 8 and the display 9, it is convenient to directly display the final information, thereby improving practicality.

[0043] Working principle: When the present invention is used, first connect the device to the desulfurization equipment through the flange on the water pipe 6, then connect the two ends of the wire 2 to the ultrasonic generator 1 and the directional sounder 4 respectively through the connector 3, and then turn on the power. When the desulfurization equipment is started and starts to run, desulfurization slurry will continuously pass through the water pipe 6. At this time, start the ultrasonic generator 1 to output a predetermined digital signal to the directional sounder 4. After receiving the signal, the directional sounder 4 emits an ultrasonic wave in the direction of the display 9. The ultrasonic wave passes through the conduction column and the rear stabilizer 5, so that the ultrasonic wave can pass through a larger range of desulfurization slurry. By real-time monitoring of the density change of the desulfurization slurry that continuously passes through the water pipe 6, the density change fluctuation value of the desulfurization slurry in the corresponding time period can be obtained. The measured desulfurization slurry density The ultrasonic wave attenuated by the desulfurization slurry and the side wall of the water pipe 6 is received by the front stabilizing plate 7 and the conduction column and transmitted to the receiver in the display 9. The sound receiving component analyzes the received ultrasonic signal. If the signal strength is less than the preset signal strength threshold, it is determined that the propagation of the ultrasonic wave is disturbed, and the received signal strength and the receiving time interval are inaccurate. The detection module arranged inside the sound generating component analyzes the influence of four factors, namely solid particles, water content, temperature and pressure, on the propagation speed of the ultrasonic wave in the medium, and obtains the density data of the medium after being affected. The algorithm component of the circuit board 8 converts the medium density data into a digital signal of the final data, which is finally transcribed and displayed through the display 9, thereby completing the real-time monitoring of the desulfurization slurry.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A desulfurization slurry foaming detection device for a thermal power plant, comprising an ultrasonic generator (1), characterized in that: The bottom surface of the ultrasonic generator (1) is provided with a plurality of transmission ports, one end of a wire (2) is connected to the transmission port, the other end of the wire (2) is rotatably connected to a connector (3), the connector (3) is connected to a sound-generating component, the sound-generating component is sleeved on a water pipe (6), and a sound-receiving component is provided at a symmetrical position of the water pipe (6); A detection module is provided inside the sound generating component. The analysis steps for determining data abnormality by the detection module are as follows: Step 1: The detection signal transmitted by the receiving sound receiving component due to the interference of ultrasonic propagation is determined. The density data of the medium in the pipeline is determined by the attenuation speed of the ultrasonic wave after passing through the pipeline and the medium inside the pipeline. The sound pressure Px=P0*E at the position x away from the starting position of the wave source when the ultrasonic wave propagates, where P0 is the sound pressure at the starting position of the wave source, the exponent of the natural logarithm e is -ax, recorded as E, and a is the attenuation coefficient; Step 2: The frequency of ultrasound is f, the propagation speed of sound waves in the medium is v, and the viscosity coefficient of the medium is B, then the density data pt of the medium is calculated , aj is the mean value of the attenuation coefficient; Step 3: Taking the inferred medium density data pt as the middle value, expand the preset fluctuation range p0 on both sides to establish the fluctuation range of the medium density data [pt-p0, pt+p0]; taking the lowest bit of the medium density data as the reference, establish the density interval of the corresponding size, prepare the standard medium sample with the corresponding density interval, and then measure the ultrasonic sound pressure attenuation data of the standard medium samples with different densities, and calculate the attenuation coefficient to obtain the attenuation coefficient set of the ultrasonic wave propagating in the medium with different densities; Step 4: Match the density attenuation coefficient corresponding to the inferred medium density data with the attenuation coefficient set, calculate the ratio of the inferred density attenuation coefficient data to each data in the attenuation coefficient set, then subtract the calculated ratio from data 1, and find the absolute value of the difference, select the minimum value in the absolute value data, and determine that the medium density data corresponding to the minimum value is the detected medium density data pj; compare the detected medium density data pj with the inferred medium density data pt. If pt=pj, then determine that the density data of the medium in the pipeline is pj; otherwise, analyze the propagation speed of ultrasonic waves in the medium.

2. A thermal power plant desulfurization slurry foaming detection device according to claim 1, characterized in that: The sound-generating component and the sound-receiving component are both arranged in the device shell (10).

3. A thermal power plant desulfurization slurry foaming detection device according to claim 1, characterized in that: The sound-generating component comprises a connector (3), the front end of the connector (3) being provided with an external thread, the connector (3) being screwed onto the rear end of a directional sound generator (4) via the external thread, the front end of the directional sound generator (4) being connected to a rear stabilizing plate (5) via a conductive rod, the front end of the rear stabilizing plate (5) being fitted and abutted against the outer side surface of a water pipe (6), and the upper and lower ends of the water pipe (6) being fixedly connected with flanges.

4. A thermal power plant desulfurization slurry foaming detection device according to claim 1, characterized in that: The sound collecting component comprises a front stabilizing plate (7), the front stabilizing plate (7) being arranged at an axially symmetrical position of the rear stabilizing plate (5) in the water pipe (6), the front end surface of the front stabilizing plate (7) being connected to a display (9) via a conductive column, the display (9) being provided with a sound wave receiver, the back of the sound wave receiver being connected to a circuit board (8), and the left and right sides of the circuit board (8) being in contact with the inner side surface of a device shell (10).

5. A thermal power plant desulfurization slurry foaming detection device according to claim 1, characterized in that: The steps for analyzing the propagation speed of ultrasonic waves in the medium are as follows: Step 1: The propagation speed of ultrasonic waves in a medium without solid particles is v0. The mass data of solid particles contained in the medium per unit time is obtained by dividing the pressure change value of the filter per unit time by the pressure increase value of the filter caused by each gram of solid particles. The weight coefficient of each solid particle is preset, and then the weight coefficient of each solid particle is multiplied by the density data of the corresponding solid particle, and the sum is obtained to obtain the comprehensive density data. The ratio of the mass data of solid particles contained in the medium per unit time to the comprehensive density data is the volume data of solid particles contained in the medium per unit time, and the ratio of the volume data of solid particles to the pipeline flow data, that is, the volume fraction VT of solid particles in the medium; Step 2: The coefficient of influence of the number of solid particles in the pipeline on the propagation speed of ultrasound in the medium is recorded as vgt. There is the following relationship between vgt and v0. The propagation speed of ultrasound in the medium containing solid particles is vjc1, and vgt is calculated; the water content in the medium will affect the propagation speed of ultrasound in the medium. The propagation speed of ultrasound in water is vs. The propagation speed of ultrasound in water-containing media is vjc2=hs*vs+(1-hs)*v0, where hs is the water content in the medium; the temperature and pressure of the medium will affect the propagation speed of ultrasound in the medium. The propagation speed of ultrasound at the set temperature is vw, and the propagation speed of ultrasound in the medium with different temperature data wd is vjc3=vw+a*wd+b* The propagation speed of ultrasound in the medium with different pressure data yl is vjc4=2K*vy+yll / 2K, yll is the pressure change, K is the bulk elastic modulus of the medium, and vy is the ultrasonic propagation speed under the initial pressure.

6. A thermal power plant desulfurization slurry foaming detection device according to claim 5, characterized in that: The steps for determining medium density after comprehensive influencing factors are as follows: Step 1: Process the historical data within the set time range of the medium flow at the pipeline location, analyze the change range of solid particles, moisture content, temperature and pressure data, and preset the weight coefficients r1, r2, r3 and r4 corresponding to the solid particles, moisture content, temperature and pressure according to the change range. Then, the influence coefficient of solid particles, moisture content, temperature and pressure on the propagation speed of ultrasonic waves in the medium is vc=r1*vgt+r2*vjc2+r3*vjc3+r4*vjc4; Step 2: Calculate the difference between the propagation velocity of the sound wave in the medium v ​​and the influence coefficient vc of the propagation velocity in the medium, and update the density data of the medium to pt1 according to the difference.

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