CN113091840B - Measurement method of solid phase flow rate in gas-solid two-phase flow - Google Patents

Abstract

The invention discloses a method for measuring solid-phase flow in gas-solid two-phase flow. The measuring method includes the following steps: S1, pre-fitting parameters K1, K2 and parameter b1 under preset conditions, the preset condition is to deliver the same gas-solid two-phase flow as the pipeline in the local resistance pipe section according to the preset solid phase flow and gas phase flow conditions; S2, feed the gas-solid two-phase flow to be measured in the local resistance pipe section; S3, measure the pressure difference PA between the resistance front section of the local resistance pipe section and atmospheric pressure; S 4. Measure the pressure difference PB between the resistance front section and the resistance rear section of the local resistance pipe section; S5, calculate the solid phase flow C in the gas-solid two-phase flow to be measured according to the pressure difference PA and the pressure difference PB using a preset formula. The measurement method according to the embodiment of the present invention has accurate and reliable measurement results, stable measurement data and rapid response.

Description

Measurement method of solid phase flow rate in gas-solid two-phase flow

technical field

The invention relates to the field of flow measurement of pneumatic conveying, in particular to a method for measuring solid phase flow in gas-solid two-phase flow.

Background technique

In tobacco, coal, grain, pharmaceutical, chemical, food and other process industries, pipeline gas transportation is often used, and the gas phase carries the solid phase to complete the transportation function. During this process, it is often necessary to measure the solid phase flow rate to determine the transport parameters and guide the next step of production. At this stage, static weighing method, differential pressure method, electromagnetic method, optical method, ray method, ultrasonic method and other methods are generally used to measure solid phase flow rate. Due to different measurement principles, these methods have different degrees of difficulty in measurement accuracy and real-time performance. Among them, the static weighing method realizes the mass flow measurement by sampling static weighing, the time response of the measurement is slow, the real-time performance is poor, and the accuracy is poor in the case of rapid process changes; the existing differential pressure method to measure the solid phase mass flow depends on the gas-solid ratio and the cross-sectional flow velocity of the gas-solid phase to calculate the solid phase flow rate, and at the same time, it is corrected by the correction coefficient. In this method, the gas-solid ratio or the cross-sectional flow velocity of the gas-solid phase itself is difficult to accurately measure. The greater the flow rate of the material, the stronger the induction charge. However, according to different physical parameters such as material properties, water content, and particle size, this method has a large difference in the amount of charge, and the error of the measured material mass flow rate is large; optical methods, ray methods, and ultrasonic methods are used for indirect measurement. The superposition and dispersion of materials are different, and the measurement results are quite different, and the accuracy is very poor. Based on the above existing methods, the measurement of solid phase flow in gas-solid two-phase flow is a difficult point in the existing measurement technology. Due to the existence of the solid phase, the measurement accuracy of the existing gas phase is also greatly affected.

Due to the characteristics of loose solid phase material, fast flow rate and high material humidity in tobacco transportation, the existing technology is difficult to measure the solid phase flow rate, and the real-time performance and accuracy are poor.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to propose a method for measuring solid phase flow in gas-solid two-phase flow, which has accurate and reliable measurement results, stable measurement data and rapid response.

According to the method for measuring solid phase flow in gas-solid two-phase flow according to an embodiment of the present invention, the measurement method includes the following steps: S1, pre-fitting parameters K1, K2 and b1 under preset conditions, the preset condition is to deliver the same gas-solid two-phase flow as the pipeline in the local resistance pipe section according to the preset solid phase flow rate and gas phase flow condition; S2, inject the gas-solid two-phase flow to be measured into the local resistance pipe section; S3, measure the pressure difference PA between the resistance front section of the local resistance pipe section and atmospheric pressure; S4, measure the pressure difference PB between the resistance front section and the resistance rear section of the local resistance pipe section; S5, calculate the solid phase flow rate C in the gas-solid two-phase flow to be measured according to the pressure difference PA and the pressure difference PB, the preset formula includes: C=k2(PB-k1*PA)+b1, wherein, 0.5≤K1≤0.8, -0.001≤K2≤-20, 0≤b1≤500.

According to the method for measuring the solid phase flow rate in the gas-solid two-phase flow of the embodiment of the present invention, by connecting the local resistance pipe section with the gas-solid two-phase flow pipeline to be measured, measuring the pressure difference PA between the first detection port and the atmospheric pressure, and the pressure difference PB between the resistance front section and the resistance back section of the local resistance pipe section, the solid phase flow rate C can be calculated by applying the preset formula. The structure is simple, the measurement result is reliable, the measurement data is stable, and the response is fast. It can be widely used in industrial occasions such as coal transportation, tobacco processing, grain transportation, and chemical production.

According to some embodiments of the present invention, the step S1 includes: S11, under preset conditions, fix the solid phase flow rate C in the gas-solid two-phase flow, and detect the pressure difference PA and pressure difference PB in the local resistance pipe section by adjusting different gas phase flow rates; S12, fit a straight line corresponding to the solid phase flow rate C in a coordinate system with the pressure difference PA as the horizontal axis and the pressure difference PB as the vertical axis; S13, repeat steps S11-S12, and make the solid phase flow rate C of each group different, Fitting to obtain straight lines corresponding to different groups of solid phase flow C; S14, performing average slope fitting on the straight lines corresponding to different groups of solid phase flow C obtained in step S13, and obtaining the first slope and the intercept value of the straight line corresponding to different groups of solid phase flow through the fitting, the first slope is the parameter K1.

According to some embodiments of the present invention, the step S1 further includes: S15, in a coordinate system with the intercept as the horizontal axis and the solid phase flow rate as the vertical axis, a straight line is obtained by fitting different groups of solid phase flow rates and the intercept values corresponding to the solid phase flow rates in step S14; S16, calculating the second slope of the straight line obtained by fitting different groups of solid phase flow rates and the intercept values corresponding to the solid phase flow rates, and the second slope is parameter K2; S17, calculating the solid phase flow rates of different groups and the corresponding solid phase flow rates The intercept value is the vertical axis intercept value of the straight line obtained by fitting, and the intercept value is the parameter b1.

According to some embodiments of the present invention, the local resistance pipe section has a first detection port, a second detection port and a third detection port, the first detection port and the second detection port are both arranged at the resistance front section of the local resistance pipe section, and the third detection port is provided at the resistance rear section of the local resistance pipe section.

According to some embodiments of the present invention, the local resistance pipe section is a reduced-diameter pipe section or an orifice plate pipe section.

According to some embodiments of the present invention, when the local resistance pipe section is a reduced-diameter pipe section, the first detection port and the second detection port are located in the first section of the reduced-diameter pipe section, the third detection port is located in the second section of the reduced-diameter pipe section, and the diameter of the first section is larger than the diameter of the second end.

According to some embodiments of the present invention, the local resistance pipe section is a Venturi pipe section or a directly reducing pipe section.

According to some embodiments of the present invention, when the local resistance pipe section is an orifice plate pipe section, the first detection port and the third detection port are respectively located on both sides of the orifice plate of the orifice plate pipe section, and the second detection port and the first detection port are located on the same side of the orifice plate of the orifice plate pipe section.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and understandable from the description of the embodiments in conjunction with the following drawings, wherein:

1 is a schematic diagram of a measuring device for solid phase flow in a pipeline of gas-solid two-phase flow according to an embodiment of the present invention;

2 is a schematic diagram of a measuring device for solid phase flow in a gas-solid two-phase flow pipeline according to another embodiment of the present invention;

3 is a schematic diagram of a measuring device for solid phase flow in a gas-solid two-phase flow pipeline according to another embodiment of the present invention;

Fig. 4 is a schematic diagram of the fitting process of the measurement method of the solid phase flow rate in the gas-solid two-phase flow according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of the fitting process of the measurement method of the solid phase flow rate in the gas-solid two-phase flow according to an embodiment of the present invention;

Fig. 6 is a schematic diagram of a fitting process of a method for measuring solid phase flow in gas-solid two-phase flow according to an embodiment of the present invention.

Reference signs:

1. Local resistance pipe section, 2. Flow measurement system, 3. Data processing component, 4. First detection port, 5. Second detection port, 6. Third detection port, 7. First pressure sensor, 8. Second pressure sensor, 9. Automatic cleaning system, 10. Venturi tube, 11. Direct variable diameter tube, 12. Orifice plate.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

The following describes a device for measuring solid phase flow in a gas-solid two-phase flow pipeline according to an embodiment of the first aspect of the present invention with reference to FIGS. 1-3 .

The device for measuring solid phase flow in a gas-solid two-phase flow pipeline according to an embodiment of the present invention includes a local resistance pipe section, a first detection port and a second detection port, a first pressure sensor, a third detection port, a second pressure sensor and a data processing component.

The local resistance pipe section can be adapted to communicate with the gas-solid two-phase flow pipeline to be tested to generate local resistance. Both the first detection port and the second detection port are located at the resistance front section of the local resistance pipe section, that is, both the first detection port and the second detection port are located at the pipe section before the local resistance pipe section generates resistance. The first end of the first pressure sensor communicates with the first detection port, and the second end communicates with the atmospheric pressure for measuring the pressure difference PA between the pressure at the first detection port and the atmospheric pressure.

The third detection port is set at the resistance rear section of the local resistance pipe section, that is, the third detection port is set at the pipe section after the local resistance pipe section generates resistance. The first end of the second pressure sensor communicates with the second detection port, and the second end communicates with the third detection port.

Further, the data processing component is respectively connected with the first pressure sensor and the second pressure sensor to receive the measured data pressure difference PA and PB of the first pressure sensor and the second pressure sensor, and calculate the solid phase flow rate C by using the preset formula C=k2(PB-k1*PA)+b1, K1, K2 and b1 are parameters pre-determined according to preset conditions before connecting with the gas-solid two-phase flow pipeline to be measured, wherein 0.5≤K1≤0.8, -0.001≤K2≤-20, 0≤b1 ≤500.

According to the device for measuring the solid phase flow rate in the gas-solid two-phase flow pipeline of the embodiment of the present invention, by connecting the local resistance pipe section with the gas-solid two-phase flow pipeline to be measured, measuring the pressure difference PA between the first detection port and the atmospheric pressure, and the pressure difference PB between the resistance front section and the resistance rear section of the local resistance pipe section, the solid phase flow rate C can be calculated by applying the preset formula. The structure is simple, the measurement result is reliable, the measurement data is stable, and the response is fast.

According to some embodiments of the present invention, the data processing component includes a fitting component, and the fitting component pre-fits parameters K1, K2, and b1 under preset conditions. The preset condition is that the local resistance pipe section delivers the same gas-solid two-phase flow as the pipeline under the preset solid phase flow and gas phase flow conditions. For solid two-phase flow, when the preset solid phase flow rate is known, the gas phase flow rate, such as the gas flow rate, is adjusted, and the parameters K1, K2 and b1 are measured by fitting.

According to some embodiments of the present invention, the fitting component includes a first fitting unit. The first fitting unit, under the preset conditions, fits straight lines corresponding to different groups of solid phase flow rates in a coordinate system formed by the pressure difference PA and the pressure difference PB according to different groups of solid phase flow rates, and the pressure difference PA and the pressure difference PB of each group of solid phase flow rates under different gas phase flow rates, and performs average fitting on the slopes of the different straight lines to obtain the first slope and the intercept value of the straight lines corresponding to different groups of solid phase flow rates. The first slope is the parameter k1.

The specific fitting process includes: S11. Under preset conditions, the solid phase flow rate C is fixed in the gas-solid two-phase flow, and the pressure difference PA and pressure difference PB in the local resistance pipe section are detected by adjusting different gas phase flow rates;

S12, fitting a straight line corresponding to the solid phase flow rate C in a coordinate system with the differential pressure PA as the horizontal axis and the differential pressure PB as the vertical axis;

S13, repeating steps S11-S12, and making the solid phase flow C of each group different, and fitting the straight lines corresponding to the solid phase flow C of different groups;

S14. Perform slope average fitting on the straight lines corresponding to different groups of solid phase flows C obtained in step S13, and obtain the first slope and the intercept value of the straight lines corresponding to different groups of solid phase flows through fitting, the first slope being the parameter K1.

According to some embodiments of the present invention, the fitting component further includes a second fitting unit, and the second fitting unit fits the intercept values corresponding to different groups of solid phase flow obtained by fitting the first fitting unit and the corresponding solid phase flow C into a straight line, the slope of the straight line is the second slope, the second slope is the parameter k2, and the intercept of the straight line is the parameter b1.

The specific fitting process also includes: S15, in the coordinate system with the intercept as the horizontal axis and the solid phase flow as the vertical axis, the different groups of solid phase flow and the intercept values corresponding to the solid phase flow in step S14 are fitted to obtain a straight line;

S16, calculating the second slope of the straight line obtained by fitting different sets of solid phase flow rates and the intercept values corresponding to the solid phase flow rates, where the second slope is a parameter K2;

S17, calculating the vertical axis intercept value of the straight line obtained by fitting the different groups of solid phase flow and the intercept value corresponding to the solid phase flow, the intercept value is the parameter b1.

In some embodiments, the data processing component also includes an adjustment parameter b2, b2 is a correction number, and the preset formula is further preferably C=k2(PB-k1*PA)+b1+b2, that is, after connecting with the gas-solid two-phase flow pipeline to be measured and measuring parameters K1, K2 and b1, the local resistance pipe section of the measuring device is connected with the gas-solid two-phase flow pipeline to be measured, and the actual zero adjustment is performed according to the working conditions and temperature on site through the correction parameter b2.

As shown in FIGS. 1-3 , in some embodiments of the present invention, the local resistance pipe section is a reduced-diameter pipe section or an orifice plate pipe section.

In some examples, as shown in Figure 1-2, when the local resistance pipe section is a reduced diameter pipe section, the first detection port and the second detection port are located in the first section of the reduced diameter pipe section, the third detection port is located in the second section of the reduced diameter pipe section, and the diameter of the first section is greater than the diameter of the second end, wherein the local resistance pipe section is a Venturi pipe section or a direct diameter reduction pipe section.

In other examples, as shown in Figure 3, when the local resistance pipe section is an orifice pipe section, the first detection port and the third detection port are respectively located on both sides of the orifice plate of the orifice pipe section, and the second detection port and the first detection port are located on the same side of the orifice plate of the orifice pipe section.

Further, in order to avoid clogging of the orifice plate by materials, dust, etc., an automatic cleaning device is also included, and the automatic cleaning device communicates with the orifice plate of the orifice plate pipe section to clean the orifice plate.

The device for measuring the flow rate of the solid phase in the pipeline of the gas-solid two-phase flow according to the embodiments of the present invention will be described below with reference to specific embodiments.

As shown in Fig. 1 , according to a specific embodiment of the present invention, a device for measuring solid phase flow in a pipeline of gas-solid two-phase flow, the device for measuring solid phase flow in a pipeline for gas-solid two-phase flow includes a local resistance pipe section 1 (venturi tube 10), a flow measurement system 2 and a data processing assembly 3. The flow measurement system 2 is composed of the first detection port 4, the second detection port 5, the third detection port 6, the first pressure sensor 7 and the second pressure sensor 8, and the local resistance pipe section 1 is a Venturi tube that shrinks first and then expands gradually. The first detection port 4 and the second detection port 5 are opened at the position before the pipe diameter of the Venturi tube 10 shrinks, and the third detection port 6 is opened at the position after the pipe diameter of the Venturi pipe shrinks to the narrowest part of the throat. The sampled signal is connected with the data processing component 3 through a circuit. When the gas-solid two-phase flow flows through the pipeline, resistance loss will occur. Due to the amplification effect of the local resistance pipe section 1 (Venturi tube 10), the generated pressure difference A and B have a relatively significant linear relationship, and the slope and intercept of the curve have a certain linear relationship with the material flow rate. Through this principle, real-time fitting parameters are generated and packaged in the data processing component 3. The pressure difference A and B are collected in real time through the sampling pipeline into the data processing component for calculation, and the material flow rate in the pipeline is obtained. At the same time, the material flow is calibrated by methods such as filtering value, averaging, comparison iteration, etc., and output to the display screen.

As shown in Fig. 2, according to another specific embodiment of the present invention, the device for measuring the solid phase flow in the gas-solid two-phase flow pipeline adopts the direct variable diameter pipe 11 as the local resistance pipe section 1, and the principle and steps are the same as in the first embodiment.

As shown in Fig. 3, according to another specific embodiment of the present invention, the measuring device for the solid phase flow rate in the gas-solid two-phase flow pipeline adopts the pipe section provided with the orifice plate 12 as the local resistance pipe section 1, and due to the characteristics of the orifice plate, it is easy to be blocked, so the automatic cleaning device is used to optimize the measuring device for the orifice plate plate. The automatic cleaning system is an air pump that can generate high-pressure gas. The one-way valve of the air pump starts the air pump to generate high-pressure gas, blows high-pressure air to the orifice plate 12, and cleans the materials and dust attached to the orifice plate 12.

The method for measuring the flow rate of the solid phase in the gas-solid two-phase flow according to the embodiment of the second aspect of the present invention includes the following steps:

S1, parameter K1, parameter K2 and parameter b1 are obtained by pre-fitting under preset conditions, the preset condition is to deliver the same gas-solid two-phase flow as the pipeline under the condition of the local resistance pipe section according to the preset solid phase flow rate and gas phase flow rate;

S2, the gas-solid two-phase flow to be measured is introduced into the local resistance pipe section;

S3, measuring the pressure difference PA between the resistance front section of the local resistance pipe section and the atmospheric pressure;

S4, measuring the pressure difference PB between the resistance front section and the resistance rear section of the local resistance pipe section;

S5. Calculate the solid phase flow C in the gas-solid two-phase flow to be measured according to the pressure difference PA and the pressure difference PB using a preset formula, the preset formula includes: C=k2(PB-k1*PA)+b1,

Among them, 0.5≤K1≤0.8, -0.001≤K2≤-20, 0≤b1≤500.

Further, step S1 includes:

S11, under preset conditions, the solid phase flow rate C is fixed in the gas-solid two-phase flow, and the pressure difference PA and the pressure difference PB in the local resistance pipe section are detected by adjusting different gas phase flow rates;

S12, fitting a straight line corresponding to the solid phase flow rate C in a coordinate system with the differential pressure PA as the horizontal axis and the differential pressure PB as the vertical axis;

S13, repeating steps S11-S12, and making the solid phase flow C of each group different, and fitting the straight lines corresponding to the solid phase flow C of different groups;

S14, performing average slope fitting on the straight lines corresponding to the different groups of solid phase flow rates C obtained in step S13, to obtain the first slope and the intercept value of the straight lines corresponding to different groups of solid phase flow rates, the first slope being the parameter K1;

S15, in the coordinate system with the intercept as the horizontal axis and the solid phase flow as the vertical axis, a straight line is obtained by fitting different sets of solid phase flow rates and the intercept values corresponding to the solid phase flow rates in step S14;

S16, calculating the second slope of the straight line obtained by fitting different sets of solid phase flow rates and the intercept values corresponding to the solid phase flow rates, where the second slope is a parameter K2;

S17, calculating the vertical axis intercept value of the straight line obtained by fitting the different groups of solid phase flow and the intercept value corresponding to the solid phase flow, the intercept value is the parameter b1.

Specifically, after selecting local resistance pipe sections, electronic scales are used to weigh different material quantities, for example, 5-6 groups are weighed, and parameter determination experiments are carried out. The main steps are: feeding uniformly, adjusting different gas phase velocities, thereby changing the gas-solid ratio of gas-solid two-phase flow, recording different pressure differences PA and PB, and performing a linear fitting according to different material flow rates, selecting the maximum slope and the minimum slope, within this range, re-fitting the straight line with different slopes, and fine-tuning the slope until the average value of the fitting degree of all fitted straight lines is the smallest. The slope at this time is the calibrated K1; The flow rate is subjected to a linear fitting, the slope is the calibrated K2, and the intercept is the calibrated b1. But b1 needs to be used in different environments, through setting experiments, fine-tuning to ensure the accuracy of the system.

Describe below in conjunction with specific examples, as shown in Figure 4, in the case of different groups of solid phase flow, such as solid phase flow C1=100kg/h, adjust the gas phase flow (wind speed), record the different pressure differences PA and PB at this time, draw the straight line of solid phase flow C1=100kg/h, similarly, draw the straight line of solid phase flow C2=200kg/h, C3=300kg/h, C4=400kg/h in turn.

Through the approximation algorithm (take the maximum value of the slope, the minimum value is the upper and lower limits of the interval, and then continuously adjust the slope in the range, use the slope to back-fit the points obtained in the experiment, until the average fitting degree of the above-mentioned straight line reaches the best) to perform fitting, so that the average fitting degree of the straight line with solid phase flow C1=100kg/h, C2=200kg/h, C3=300kg/h, C4=400kg/h is the best, and the slope of the obtained straight line at this time is the first slope, which is k1. And use the slope k1 to re-fit the points obtained in the experiment to obtain the fitted straight lines, and draw these straight lines, as shown in Figure 5, at this time, record the corresponding vertical axis intercept values under the respective solid phase flow rates C1=100kg/h, C2=200kg/h, C3=300kg/h, and C4=400kg/h.

As shown in Figure 6, the intercept of all the fitted straight lines is used as the x-axis, and the solid phase flow rate represented by all the straight lines is used as the y-axis to draw a straight line. The slope of the straight line is the second slope K2, and the intercept value corresponding to the vertical axis is the calculated b1.

Therefore, according to the method of measuring the solid phase flow rate in the gas-solid two-phase flow according to the embodiment of the present invention, the parameters K1, K2 and b1 are pre-fitted under the preset conditions through experiments, and then the local resistance pipe section is connected with the gas-solid two-phase flow pipeline to be measured to detect the pressure difference PA and PB at this time, and the preset formula C=k2(PB-k1*PA)+b1 is used to realize the measurement of the solid phase flow rate. The measurement result of this measurement method is reliable, the measurement data is stable, and the response is fast. Transportation, tobacco processing, grain transportation, chemical production and other industrial occasions.

In the description of the present invention, "first feature" and "second feature" may include one or more of these features.

In the description of the present invention, "plurality" means two or more.

In the description of the present invention, a first feature being "on" or "under" a second feature may include that the first and second features are in direct contact, and may also include that the first and second features are not in direct contact but are in contact through another feature between them.

In the description of the present invention, "above", "above" and "above" a first feature on a second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

Other configurations and operations of the device for measuring solid phase flow in pipelines of gas-solid two-phase flow and the method for measuring solid phase flow in gas-solid two-phase flow according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with this embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that: without departing from the principle and purpose of the present invention, various changes, modifications, replacements and modifications can be made to these embodiments, and the scope of the present invention is defined by the claims and their equivalents.

Claims (6)

1. a method for measuring solid phase flow in gas-solid two-phase flow, is characterized in that, described method for measuring comprises the following steps: S1, parameter K1, parameter K2 and parameter b1 are pre-fitted under preset conditions, the preset condition is to transport the same gas-solid two-phase flow as the pipeline under the condition of the local resistance pipe section according to the preset solid phase flow rate and gas phase flow rate; S2, the gas-solid two-phase flow to be measured is introduced into the local resistance pipe section; S3, measuring the pressure difference PA between the resistance front section of the local resistance pipe section and the atmospheric pressure; S4, measuring the pressure difference PB between the resistance front section and the resistance rear section of the local resistance pipe section; S5. Calculate the solid phase flow C in the gas-solid two-phase flow to be measured according to the pressure difference PA and the pressure difference PB using a preset formula, the preset formula includes: C=k2(PB-k1*PA)+b1, Wherein, 0.5≤K1≤0.8, -0.001≤K2≤-20, 0≤b1≤500, the step S1 includes: S11, under preset conditions, the solid phase flow rate C is fixed in the gas-solid two-phase flow, and the pressure difference PA and the pressure difference PB in the local resistance pipe section are detected by adjusting different gas phase flow rates; S12, fitting a straight line corresponding to the solid phase flow rate C in a coordinate system with the differential pressure PA as the horizontal axis and the differential pressure PB as the vertical axis; S13, repeating steps S11-S12, and making the solid phase flow C of each group different, and fitting the straight lines corresponding to the solid phase flow C of different groups; S14, the straight lines corresponding to the different groups of solid-phase flow rates C obtained in step S13 are averagely fitted by the approach algorithm to obtain the first slope and the intercept values of the straight lines corresponding to different groups of solid-phase flow rates, the first slope is the parameter K1, and the step S1 also includes: S15, in the coordinate system with the intercept as the horizontal axis and the solid phase flow as the vertical axis, a straight line is obtained by fitting different sets of solid phase flow rates and the intercept values corresponding to the solid phase flow rates in step S14; S16, calculating the second slope of the straight line obtained by fitting different sets of solid phase flow rates and the intercept values corresponding to the solid phase flow rates, where the second slope is a parameter K2; S17, calculating the vertical axis intercept value of the straight line obtained by fitting the different groups of solid phase flow and the intercept value corresponding to the solid phase flow, the intercept value is the parameter b1. 2. the method for measuring solid phase flow in gas-solid two-phase flow according to claim 1, it is characterized in that, described local resistance pipe section has first detection port, second detection port and the 3rd detection port, described first detection port and described second detection port are all arranged at the resistance front section of described local resistance pipe section, and described 3rd detection port is located at the resistance rear section of described local resistance pipe section. 3 . The method for measuring solid phase flow in gas-solid two-phase flow according to claim 2 , wherein the local resistance pipe section is a variable diameter pipe section or an orifice plate pipe section. 4 . 4. The method for measuring solid phase flow in gas-solid two-phase flow according to claim 3, wherein when the local resistance pipe section is a reduced diameter pipe section, the first detection port and the second detection port are located at the first section of the reduced diameter pipe section, the third detection port is located at the second section of the reduced diameter pipe section, and the diameter of the first section is greater than the diameter of the second section. 5 . The method for measuring solid phase flow in gas-solid two-phase flow according to claim 4 , wherein the local resistance pipe section is a Venturi pipe section or a direct variable diameter pipe section. 6 . 6. the method for measuring solid phase flow in gas-solid two-phase flow according to claim 5, it is characterized in that, when described local resistance pipe section is orifice plate pipe section, described first detection port and described the 3rd detection port are positioned at the both sides of the orifice plate of described orifice plate pipe section respectively, and described second detection port and described first detection port are positioned at the same side of the orifice plate of described orifice plate pipe section.