CN113091840B - Method for measuring solid phase flow in gas-solid two-phase flow - Google Patents
Method for measuring solid phase flow in gas-solid two-phase flow Download PDFInfo
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- CN113091840B CN113091840B CN202110364812.4A CN202110364812A CN113091840B CN 113091840 B CN113091840 B CN 113091840B CN 202110364812 A CN202110364812 A CN 202110364812A CN 113091840 B CN113091840 B CN 113091840B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
- G01F1/88—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with differential-pressure measurement to determine the volume flow
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a method for measuring solid phase flow in gas-solid two-phase flow, which comprises the following steps: s1, pre-fitting under preset conditions to obtain parameters K1, K2 and b1, wherein the preset conditions are that the gas-solid two-phase flow which is the same as the pipeline is conveyed under the condition that the local resistance pipe section is in accordance with the preset solid-phase flow and gas-phase flow; s2, introducing a gas-solid two-phase flow to be detected 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, calculating solid phase flow C in the gas-solid two-phase flow to be detected by applying a preset formula according to the pressure difference PA and the pressure difference PB, wherein the preset formula comprises: c=k2 (PB-k1×pa) +b1, where 0.5.ltoreq.k1.ltoreq.0.8, -0.001.ltoreq.k2.ltoreq.20, 0.ltoreq.b1.ltoreq.500. The measuring method provided by the embodiment of the invention has the advantages of accurate and reliable measuring result, stable measuring data and quick response.
Description
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
In the process industries of tobacco, coal, grain, pharmacy, chemical industry, food and the like, a pipeline gas conveying method is often adopted, and a conveying function is completed by carrying a solid phase by a gas phase. In this process, it is often necessary to take measurements of the solid phase flow to determine the transport parameters and to guide the next production step. In the present stage, the solid phase flow is generally measured by adopting a static weighing method, a differential pressure method, an electromagnetic method, an optical method, a ray method, an ultrasonic method and the like, and the methods have different difficulties in terms of measurement accuracy and instantaneity due to different measurement principles. The static weighing method realizes mass flow measurement through sampling static weighing, and has slow time response, poor real-time performance and poor accuracy under the condition of rapid process change; the existing differential pressure method is used for measuring the solid phase mass flow rate, the solid phase flow rate is calculated by means of the gas-solid ratio, the gas-solid section flow rate and the like, and the correction is carried out through the correction coefficient; the electromagnetic method adopts weak electrification on the surface of the material to realize induction, and the larger the material flow is, the stronger the induction electrification is, but the method has larger charge quantity difference and larger measured material mass flow error according to different physical parameters such as material properties, water content, granularity and the like; the optical method, the ray method, the ultrasonic method and the like are all indirect measurement, the superposition and dispersion degree of materials are different, the measurement results are greatly different, and the accuracy is very poor. By combining the prior methods, the measurement of the solid phase flow in the gas-solid two-phase flow is a difficult point in the prior measurement technology, and the measurement accuracy of the prior gas phase is greatly affected due to the existence of the solid phase.
Because of the characteristics of loose solid phase materials, high flow speed, high material humidity and the like in tobacco conveying, the prior art has great difficulty in measuring solid phase flow and poor instantaneity and accuracy.
Disclosure of 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 provide a method for measuring solid phase flow in gas-solid two-phase flow, which has accurate and reliable measurement result, stable measurement data and rapid response.
According to the embodiment of the invention, the method for measuring the solid phase flow in the gas-solid two-phase flow comprises the following steps of: s1, pre-fitting under preset conditions to obtain parameters K1, K2 and b1, wherein the preset conditions are that the gas-solid two-phase flow which is the same as the pipeline is conveyed under the condition that the local resistance pipe section is in accordance with the preset solid-phase flow and gas-phase flow; s2, introducing a gas-solid two-phase flow to be detected 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, calculating solid phase flow C in the gas-solid two-phase flow to be detected by applying a preset formula according to the pressure difference PA and the pressure difference PB, wherein the preset formula comprises: c=k2 (PB-k1×pa) +b1, where 0.5.ltoreq.k1.ltoreq.0.8, -0.001.ltoreq.k2.ltoreq.20, 0.ltoreq.b1.ltoreq.500.
According to the method for measuring the solid phase flow in the gas-solid two-phase flow, the partial resistance pipe section is communicated with the gas-solid two-phase flow pipeline to be measured, the pressure difference PA between the first detection port and the atmosphere and the pressure difference PB between the resistance front section and the resistance rear section of the partial resistance pipe section are measured, the solid phase flow C can be obtained through calculation by applying a preset formula, the structure is simple, the measurement result is reliable, the measurement data is stable, the response is rapid, the application occasion is wide, and the method can be widely applied to industrial occasions such as coal transportation, tobacco processing, grain transportation, chemical production and the like.
According to some embodiments of the invention, the step S1 includes: s11, under the preset condition, fixing solid phase flow C in the gas-solid two-phase flow, and detecting pressure difference PA and pressure difference PB in the local resistance pipe section by adjusting different gas phase flows; s12, fitting a straight line corresponding to the solid phase flow C in a coordinate system taking the differential pressure PA as a horizontal axis and the differential pressure PB as a vertical axis; s13, repeating the steps S11-S12, enabling the solid phase flow C of each group to be different, and fitting to obtain straight lines corresponding to the solid phase flow C of different groups; and S14, carrying out slope average fitting on the straight lines corresponding to the different groups of solid phase flow rates C obtained in the step S13, and obtaining a first slope and intercept values of the straight lines corresponding to the different groups of solid phase flow rates by fitting, wherein the first slope is a parameter K1.
According to some embodiments of the invention, the step S1 further comprises: s15, fitting different groups of solid phase flow rates and intercept values corresponding to the solid phase flow rates in the step S14 to obtain straight lines in a coordinate system with the intercept as a horizontal axis and the solid phase flow rate as a vertical axis; s16, calculating second slopes of straight lines obtained by fitting different groups of solid phase flow and intercept values corresponding to the solid phase flow, wherein the second slopes are parameters K2; s17, calculating the intercept values of the vertical axes of the straight lines obtained by fitting different groups of solid phase flow and the intercept values corresponding to the solid phase flow, wherein the intercept values are the parameter b1.
According to some embodiments of the invention, the partial resistance tube segment has a first detection port, a second detection port, and a third detection port, the first detection port and the second detection port being both provided in a resistance front section of the partial resistance tube segment, and the third detection port being provided in a resistance rear section of the partial resistance tube segment.
According to some embodiments of the invention, the local resistance tube segment is a reducer tube segment or an orifice tube segment.
According to some embodiments of the invention, when the partial resistance pipe section is a reducer pipe section, the first and second detection ports are located at a first section of the reducer pipe section, the third detection port is located at a second section of the reducer pipe section, and the first section has a diameter greater than a diameter of the second end.
According to some embodiments of the invention, the partial resistance tube segment is a venturi tube segment or a direct reduction tube segment.
According to some embodiments of the invention, when the local resistance tube segment is an orifice tube segment, the first detection port and the third detection port are respectively located at two sides of an orifice plate of the orifice tube segment, and the second detection port and the first detection port are located at the same side of the orifice plate of the orifice tube segment.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a device for measuring solid phase flow in a gas-solid two-phase flow line according to one embodiment of the invention;
FIG. 2 is a schematic diagram of a device for measuring solid phase flow in a gas-solid two-phase flow line according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a device for measuring solid phase flow in a gas-solid two-phase flow line according to yet another embodiment of the present invention;
FIG. 4 is a schematic illustration of a fitting process of a method for measuring solid phase flow in a gas-solid two-phase flow according to an embodiment of the present invention;
FIG. 5 is a schematic illustration of a fitting process of a method for measuring solid phase flow in a gas-solid two-phase flow according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a fitting procedure of a method for measuring solid phase flow in a gas-solid two-phase flow according to an embodiment of the present invention.
Reference numerals:
1. the device comprises a local resistance pipe section, 2, a flow measuring system, 3, a data processing component, 4, a first detection port, 5, a second detection port, 6, a third detection port, 7, a first pressure sensor, 8, a second pressure sensor, 9, an automatic cleaning system, 10, a venturi tube, 11, a direct reducer tube, 12 and a pore plate.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
A measurement device for solid phase flow in a gas-solid two-phase flow pipeline according to an embodiment of the first aspect of the present invention will be described with reference to fig. 1 to 3.
The device for measuring the solid phase flow in the gas-solid two-phase flow pipeline comprises a local resistance pipe section, a first detection port, a second detection port, a first pressure sensor, a third detection port, a second pressure sensor and a data processing assembly.
The local resistance pipe section can be suitable for being communicated with a gas-solid two-phase flow pipeline to be tested and used for generating local resistance, and the first detection port and the second detection port are both positioned at the resistance front section of the local resistance pipe section, namely, the first detection port and the second detection port are both positioned at the pipe section before the local resistance pipe section generates resistance. The first end of the first pressure sensor is communicated with the first detection port, and the second end of the first pressure sensor is communicated with the atmospheric pressure and is used for measuring the pressure difference PA between the pressure at the first detection port and the atmospheric pressure.
The third detection port is arranged at the resistance rear section of the local resistance pipe section, namely the third detection port is arranged at the pipe section after the local resistance pipe section generates resistance, the first end of the second pressure sensor is communicated with the second detection port, and the second end of the second pressure sensor is communicated with the third detection port and is used for measuring the pressure difference PB between the pressure of the second detection port before resistance loss and the pressure after resistance loss.
Further, the data processing component is respectively connected with the first pressure sensor and the second pressure sensor to receive the measured data differential pressure PA and PB of the first pressure sensor and the second pressure sensor, and calculates the solid phase flow C by applying a preset formula C=k2 (PB-K1. Times. PA) +b1, wherein K1, K2 and b1 are parameters which are determined in advance according to preset conditions before being communicated with the gas-solid two-phase flow pipeline to be detected, K1 is more than or equal to 0.5 and less than or equal to 0.8, -K2 is more than or equal to 0.001 and less than or equal to-20, and b1 is more than or equal to 0 and less than or equal to 500.
According to the device for measuring the solid phase flow in the gas-solid two-phase flow pipeline, the partial resistance pipe section is communicated with the gas-solid two-phase flow pipeline to be measured, the pressure difference PA between the first detection port and the atmosphere and the pressure difference PB between the resistance front section and the resistance rear section of the partial resistance pipe section are measured, the solid phase flow C can be obtained through calculation by applying a preset formula, the device is simple in structure, reliable in measurement result, stable in measurement data, rapid in response and wide in application occasion, and can be widely applied to industrial occasions such as coal transportation, tobacco processing, grain transportation and chemical production.
According to some embodiments of the present invention, the data processing assembly includes a fitting assembly, where the fitting assembly fits in advance to obtain parameters K1, K2 and b1 under preset conditions, where 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, that is, parameters K1, K2 and b1 are measured before the measuring device is communicated with the actual gas-solid two-phase flow pipeline to be measured, specifically, under experimental conditions, the same gas-solid two-phase flow as the pipeline to be measured is adopted, and under the condition that the preset solid-phase flow is known, the gas-phase flow such as the flow rate of the gas is adjusted, and parameters K1, K2 and b1 are measured by adopting a fitting method.
According to some embodiments of the invention, the fitting assembly includes a first fitting unit, the first fitting unit fits straight lines corresponding to different groups of solid phase flows respectively in a coordinate system formed by the pressure difference PA and the pressure difference PB according to different groups of solid phase flows and the pressure difference PA of each group of solid phase flows under different gas phase flows under the preset condition, and average fits slopes of the different straight lines to obtain a first slope and intercept values of straight lines corresponding to different groups of solid phase flows, wherein the first slope is the parameter k1.
The specific fitting process comprises the following steps: s11, under the preset condition, fixing solid phase flow C in the gas-solid two-phase flow, and detecting pressure difference PA and pressure difference PB in the local resistance pipe section by adjusting different gas phase flows;
s12, fitting a straight line corresponding to the solid phase flow C in a coordinate system taking the differential pressure PA as a horizontal axis and the differential pressure PB as a vertical axis;
s13, repeating the steps S11-S12, enabling the solid phase flow C of each group to be different, and fitting to obtain straight lines corresponding to the solid phase flow C of different groups;
and S14, carrying out slope average fitting on the straight lines corresponding to the different groups of solid phase flow rates C obtained in the step S13, and obtaining a first slope and intercept values of the straight lines corresponding to the different groups of solid phase flow rates by fitting, wherein the first slope is a parameter K1.
According to some embodiments of the invention, the fitting assembly further comprises a second fitting unit, the second fitting unit fits the intercept values corresponding to the different sets of solid phase flows obtained by fitting by the first fitting unit and the corresponding solid phase flows C into a straight line, the slope of the straight line is a second slope, the second slope is a parameter k2, and the intercept of the straight line is a parameter b1.
The specific fitting process further comprises: s15, fitting different groups of solid phase flow rates and intercept values corresponding to the solid phase flow rates in the step S14 to obtain straight lines in a coordinate system with the intercept as a horizontal axis and the solid phase flow rate as a vertical axis;
s16, calculating second slopes of straight lines obtained by fitting different groups of solid phase flow and intercept values corresponding to the solid phase flow, wherein the second slopes are parameters K2;
s17, calculating the intercept values of the vertical axes of the straight lines obtained by fitting different groups of solid phase flow and the intercept values corresponding to the solid phase flow, wherein the intercept values are the parameter b1.
In some embodiments, the data processing assembly further 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 the parameters K1, K2 and b1 are determined by communicating with the gas-solid two-phase flow pipeline to be measured, the local resistance pipe section of the measuring device is communicated with the gas-solid two-phase flow pipeline to be measured, and the actual zeroing is performed according to the working condition, the temperature and the like in the field through the correction parameter b 2.
In some embodiments of the invention, as shown in fig. 1-3, the localized resistance tube segment is a reducer tube segment or an orifice tube segment.
In some examples, as in fig. 1-2, when the local resistance pipe segment is a reducer pipe segment, the first detection port and the second detection port are located in a first segment of the reducer pipe segment, and the third detection port is located in a second segment of the reducer pipe segment, the diameter of the first segment being greater than the diameter of the second end, wherein the local resistance pipe segment is a venturi pipe segment or a direct reducer pipe segment.
In other examples, as shown in fig. 3, when the local resistance tube segment is an orifice tube segment, the first detection port and the third detection port are respectively located at two sides of the orifice plate of the orifice tube segment, and the second detection port and the first detection port are located at the same side of the orifice plate of the orifice tube segment.
Further, in order to avoid blocking the orifice plate by materials, dust and the like, the automatic cleaning device is further included, and the automatic cleaning device is communicated with the orifice plate of the orifice plate pipe section so as to clean the orifice plate.
The following describes a device for measuring a solid phase flow in a gas-solid two-phase flow pipeline according to an embodiment of the present invention with reference to a specific embodiment.
Referring to fig. 1, a 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 1 (venturi 10), a flow measurement system 2, and a data processing assembly 3. The flow measuring system 2 consists of a first detecting port 4, a second detecting port 5, a third detecting port 6, a first pressure sensor 7 and a second pressure sensor 8, and the local resistance pipe section 1 is a venturi pipe which is contracted firstly and then gradually expanded. A first detection port 4 and a second detection port 5 are formed in the position before the pipe diameter of the venturi tube 10 is contracted, a third detection port 6 is formed in the position after the pipe diameter of the venturi tube is contracted to the narrowest throat part, and the first detection port 4, a first pressure sensor 7 and the atmosphere are connected through a pipeline to measure the pressure difference PA and corresponding pressure fluctuation; the second detection port 5, the second pressure sensor 8 and the third detection port 6 are connected through pipelines, and the pressure difference PB and corresponding pressure fluctuation are measured to form a sampling pipeline. The sampled signal is connected by a circuit to the data processing component 3. When the gas-solid two-phase flow flows in the pipeline, resistance loss is generated, the generated pressure difference A, B has a more obvious linear relation due to the amplification effect of the local resistance pipe section 1 (venturi pipe 10), the slope, intercept and material flow of the curve have a certain linear relation, real-time fitting parameters are generated through the principle, the real-time fitting parameters are packaged into the data processing assembly 3, and the pressure difference A, B is collected into the data processing assembly in real time through the sampling pipeline for calculation, so that the material flow in the pipeline is obtained. And simultaneously, calibrating the material flow by methods of filtering values, averaging, comparing and iterating and the like, and outputting the material flow to a display screen.
Referring to fig. 2, a device for measuring solid phase flow in a gas-solid two-phase flow pipeline according to another embodiment of the present invention adopts a direct reducer 11 as a local resistance pipe section 1, and the principle and steps are the same as those of embodiment 1.
Referring to fig. 3, according to another embodiment of the present invention, a measuring device for solid phase flow in a gas-solid two-phase flow pipeline adopts a pipe section provided with an orifice plate 12 as a local resistance pipe section 1, and is easy to be blocked due to the characteristics of the orifice plate, so that the measuring device of the orifice plate is optimized by a matched automatic cleaning device.
According to the embodiment of the second aspect of the invention, the method for measuring the solid phase flow in the gas-solid two-phase flow comprises the following steps:
s1, pre-fitting under preset conditions to obtain parameters K1, K2 and b1, wherein the preset conditions are that the gas-solid two-phase flow which is the same as the pipeline is conveyed under the condition that the local resistance pipe section is in accordance with the preset solid-phase flow and gas-phase flow;
s2, introducing a gas-solid two-phase flow to be detected 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, calculating solid phase flow C in the gas-solid two-phase flow to be detected by applying a preset formula according to the pressure difference PA and the pressure difference PB, wherein the preset formula comprises: c=k2 (PB-k1 PA) +b1,
wherein K1 is more than or equal to 0.5 and less than or equal to 0.8, K2 is more than or equal to-0.001 and less than or equal to-20, and b1 is more than or equal to 0 and less than or equal to 500.
Further, step S1 includes:
s11, under the preset condition, fixing solid phase flow C in the gas-solid two-phase flow, and detecting pressure difference PA and pressure difference PB in the local resistance pipe section by adjusting different gas phase flows;
s12, fitting a straight line corresponding to the solid phase flow C in a coordinate system taking the differential pressure PA as a horizontal axis and the differential pressure PB as a vertical axis;
s13, repeating the steps S11-S12, enabling the solid phase flow C of each group to be different, and fitting to obtain straight lines corresponding to the solid phase flow C of different groups;
s14, carrying out slope average fitting on the straight lines corresponding to the different groups of solid phase flow C obtained in the step S13, and obtaining a first slope and intercept values of the straight lines corresponding to the different groups of solid phase flow C by fitting, wherein the first slope is a parameter K1;
s15, fitting different groups of solid phase flow rates and intercept values corresponding to the solid phase flow rates in the step S14 to obtain straight lines in a coordinate system with the intercept as a horizontal axis and the solid phase flow rate as a vertical axis;
s16, calculating second slopes of straight lines obtained by fitting different groups of solid phase flow and intercept values corresponding to the solid phase flow, wherein the second slopes are parameters K2;
s17, calculating the intercept values of the vertical axes of the straight lines obtained by fitting different groups of solid phase flow and the intercept values corresponding to the solid phase flow, wherein the intercept values are the parameter b1.
Specifically, after selecting a local resistance pipe section, weighing different material amounts by using an electronic scale, for example weighing 5-6 groups, and carrying out a parameter measurement experiment. Uniformly feeding, adjusting different gas phase speeds, thereby changing the gas-solid ratio of a gas-solid two-phase flow, recording different pressure differences PA and PB, performing linear fitting for one time according to different material flows, selecting a maximum slope and a minimum slope, re-fitting straight lines with different slopes within the range, and fine-tuning the slopes until the average value of the fitting degrees of all the fitted straight lines is minimum, wherein the slope at the moment is the calibrated K1; at this time, the intercept of all the fitting lines and the material flow are linearly fitted once, the slope is the calibrated K2, and the intercept is the calibrated b1. B1 is required to be used in different environments, and fine adjustment is performed through a tuning experiment to ensure the accuracy of the system.
In the following description, referring to specific examples, as shown in fig. 4, in the case of different sets of solid phase flows, for example, solid phase flow c1=100 kg/h, gas phase flow (wind speed) is adjusted, different differential pressures PA and PB are recorded at this time, straight lines of solid phase flow c1=100 kg/h are drawn, and similarly straight lines of solid phase flow c2=200 kg/h, c3=300 kg/h, and c4=400 kg/h are drawn in order.
Fitting is performed through an approach algorithm (taking the maximum value of the slope, the minimum value is the upper limit and the lower limit of the interval, then continuously adjusting the slope in the range, using points obtained by the slope inverse fitting experiment until the average fitting degree of the straight line reaches the best), so that the average fitting degree of the straight line of the solid phase flow C1=100 kg/h, C2=200 kg/h, C3=300 kg/h and C4=400 kg/h is the best, and the slope of the straight line obtained at the moment is the first slope, namely k1. And the points obtained by the experiment are re-fitted with the slope k1 to obtain fitted straight lines, and the straight lines are drawn, as shown in fig. 5, and the corresponding vertical axis intercept values at each solid phase flow rate c1=100 kg/h, c2=200 kg/h, c3=300 kg/h, and c4=400 kg/h are recorded.
As shown in fig. 6, the intercept of all the fitting straight lines is taken as the x-axis, the solid phase flow represented by all the straight lines is taken as the y-axis, the slope of the straight line is the second slope K2, and the intercept value corresponding to the vertical axis is the obtained b1.
Therefore, according to the method for measuring the solid phase flow in the gas-solid two-phase flow, the parameters K1, K2 and b1 are fitted in advance under the preset condition through experiments, then the local resistance pipe section is communicated with the gas-solid two-phase flow pipeline to be measured, the pressure difference PA and the pressure difference PB at the moment are detected, the measurement of the solid phase flow is realized by applying the preset formula C=k2 (PB-K1. Times.PA) +b1, the measurement result of the measurement method is reliable, the measurement data is stable, the response is rapid, the application occasion is wider, and the method can be widely applied to industrial occasions such as coal transportation, tobacco processing, grain transportation, chemical production and the like.
In the description of the invention, a "first feature" or "second feature" may include one or more of such features.
In the description of the present invention, "plurality" means two or more.
In the description of the invention, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.
In the description of the invention, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.
Other configurations and operations of the apparatus for measuring the solid phase flow in the pipe of the gas-solid two-phase flow and the method for measuring the solid phase flow in the gas-solid two-phase flow according to the embodiment of the present invention are known to those skilled in the art, and will not be described in detail herein.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A method for measuring solid phase flow in a gas-solid two-phase flow, the method comprising the steps of:
s1, pre-fitting under preset conditions to obtain parameters K1, K2 and b1, wherein the preset conditions are that the gas-solid two-phase flow which is the same as the pipeline is conveyed under the condition that the local resistance pipe section is in accordance with the preset solid-phase flow and gas-phase flow;
s2, introducing a gas-solid two-phase flow to be detected 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, calculating solid phase flow C in the gas-solid two-phase flow to be detected by applying a preset formula according to the pressure difference PA and the pressure difference PB, wherein the preset formula comprises: c=k2 (PB-k1 PA) +b1,
wherein K1 is more than or equal to 0.5 and less than or equal to 0.8, K2 is more than or equal to-0.001 and less than or equal to-20, b1 is more than or equal to 0 and less than or equal to 500, and the step S1 comprises:
s11, under the preset condition, fixing solid phase flow C in the gas-solid two-phase flow, and detecting pressure difference PA and pressure difference PB in the local resistance pipe section by adjusting different gas phase flows;
s12, fitting a straight line corresponding to the solid phase flow C in a coordinate system taking the differential pressure PA as a horizontal axis and the differential pressure PB as a vertical axis;
s13, repeating the steps S11-S12, enabling the solid phase flow C of each group to be different, and fitting to obtain straight lines corresponding to the solid phase flow C of different groups;
s14, slope average fitting is carried out on the straight lines corresponding to the different groups of solid phase flow C obtained in the step S13 through an approach algorithm, so as to obtain a first slope and intercept values of the straight lines corresponding to the different groups of solid phase flow C, wherein the first slope is a parameter K1, and the step S1 further comprises:
s15, fitting different groups of solid phase flow rates and intercept values corresponding to the solid phase flow rates in the step S14 to obtain straight lines in a coordinate system with the intercept as a horizontal axis and the solid phase flow rate as a vertical axis;
s16, calculating second slopes of straight lines obtained by fitting different groups of solid phase flow and intercept values corresponding to the solid phase flow, wherein the second slopes are parameters K2;
s17, calculating the intercept values of the vertical axes of the straight lines obtained by fitting different groups of solid phase flow and the intercept values corresponding to the solid phase flow, wherein the intercept values are the parameter b1.
2. The method according to claim 1, wherein the partial 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 provided at a resistance front section of the partial resistance pipe section, and the third detection port is provided at a resistance rear section of the partial resistance pipe section.
3. The method of claim 2, wherein the local resistance pipe section is a reducer pipe section or an orifice pipe section.
4. The method according to claim 3, wherein when the partial resistance pipe section is a reducer pipe section, the first detection port and the second detection port are located in a first section of the reducer pipe section, the third detection port is located in a second section of the reducer pipe section, and a diameter of the first section is larger than a diameter of the second section.
5. The method according to claim 4, wherein the partial resistance pipe section is a venturi pipe section or a direct reducer pipe section.
6. The method according to claim 5, wherein when the partial resistance pipe section is an orifice pipe section, the first detection port and the third detection port are located on two sides of an orifice plate of the orifice pipe section, respectively, and the second detection port and the first detection port are located on the same side of an orifice plate of the orifice pipe section.
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| CN104406646A (en) * | 2014-10-29 | 2015-03-11 | 水煤浆气化及煤化工国家工程研究中心 | Measurement device of pulverized coal mass flow meter |
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| DD209089A3 (en) * | 1981-07-17 | 1984-04-18 | Horst Kretschmer | MEASURING METHOD FOR THE DETERMINATION OF THE MASS FLOW OF DUST-SOUND AND FINE-COMBUSTIBLE FUELS |
| JPS6076621A (en) * | 1983-10-04 | 1985-05-01 | Denka Consult & Eng Co Ltd | Solid-flow-rate measuring method in mixed phase stream of solid |
| CN1021083C (en) * | 1989-01-03 | 1993-06-02 | 浙江大学 | Gas-liquid fixed double phase flow measuring method |
| CN1026354C (en) * | 1992-01-30 | 1994-10-26 | 武汉空军雷达学院科技开发部 | Gas-solid double phase powder flow device |
| US5600073A (en) * | 1994-11-02 | 1997-02-04 | Foster-Miller, Inc. | Method and system for analyzing a two phase flow |
| CN102141423B (en) * | 2010-01-29 | 2014-08-06 | 通用电气公司 | System and method for measuring solid mass flow in solid-gas mixture in real time |
| CN104897222B (en) * | 2014-03-07 | 2018-03-02 | 华东理工大学 | The solid flow measuring system and measuring method of During Dense Phase Pneumatic Transportation |
| CN106197588B (en) * | 2016-06-23 | 2019-01-18 | 华东理工大学 | A method of assessment Dense Phase Pneumatic Conveying System solid phase mass flow |
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