CN216283709U - Device for measuring solid phase flow in pipeline of gas-solid two-phase flow - Google Patents
Device for measuring solid phase flow in pipeline of gas-solid two-phase flow Download PDFInfo
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Abstract
The utility model discloses a device for measuring solid phase flow in a pipeline of gas-solid two-phase flow, which comprises a local resistance pipe section, a first detection port, a second detection port and a third detection port, wherein the local resistance pipe section is a reducing pipe section or a pore plate pipe section; the first pressure sensor is used for measuring a pressure difference PA between 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; and the data processor is respectively connected with the first pressure sensor and the second pressure sensor. The measuring device provided by the embodiment of the utility model has the advantages of simple structure, few components and convenience in use.
Description
Technical Field
The utility model relates to the field of flow measurement of pneumatic transmission, in particular to a device for measuring solid phase flow in a pipeline of 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 transportation 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 delivery parameters and to direct further production. At present, the solid phase flow is generally measured by methods such as a static weighing method, a differential pressure method, an electromagnetic method, an optical method, an ray method, an ultrasonic method and the like, and the methods have different degrees of difficulty in the aspects of measurement accuracy and real-time performance due to different measurement principles. The static weighing method realizes mass flow measurement by sampling static weighing, and has slow measurement time response and poor real-time performance, and has poor accuracy under the condition of rapid process change; the solid phase flow is calculated by the gas-solid ratio, the gas-solid phase cross section flow velocity and the like in the conventional differential pressure method, and is corrected by a correction coefficient, in the method, the gas-solid ratio or the gas-solid phase cross section flow velocity is a quantity which is difficult to accurately measure, so that the accuracy of the conventional differential pressure method is poor; the electromagnetic method adopts weak electrification on the surface of the material to realize induction, the larger the material flow is, the stronger the induction charge is, but the method has larger difference of charged quantity and larger error of measured material mass flow according to different physical parameters such as material properties, water content, granularity and the like; optical methods, ray methods, ultrasonic methods and the like adopt indirect measurement, materials are different in superposition, dispersity and the like, measurement results are large in difference, and accuracy is very poor. By combining the existing methods, the measurement of the solid phase flow in the gas-solid two-phase flow is a difficult point in the existing measurement technology, and the measurement accuracy of the existing gas phase is greatly influenced due to the existence of the solid phase.
Because the tobacco is carried characteristics such as solid phase material is loose, the velocity of flow is fast, material humidity height, prior art is big to the solid phase flow measurement degree of difficulty, and real-time, accuracy are poor, and current measuring device structure is comparatively complicated usually simultaneously, leads to whole use comparatively inconvenient.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model aims to provide a device for measuring the solid phase flow rate in a pipeline of gas-solid two-phase flow, which has the advantages of simple structure, few components and convenient use.
According to a first aspect of the present invention, there is provided an apparatus for measuring a solid phase flow rate in a pipe for a gas-solid two-phase flow, the apparatus comprising: the local resistance pipe section is suitable for being communicated with a gas-solid two-phase flow pipeline, and is a variable diameter pipe section or a pore plate pipe section; the first detection port and the second detection port are both arranged at the resistance front section of the local resistance pipe section; a first pressure sensor, a first end of which is communicated with the first detection port and a second end of which is communicated with the atmosphere, for measuring a pressure difference PA between the first detection port and the atmosphere; the third detection port is arranged at the resistance rear section of the local resistance pipe section; the pressure sensor comprises a first pressure sensor and a data processor, wherein the first end of the first pressure sensor is communicated with the first detection port, the second end of the first pressure sensor is communicated with the second detection port, the second end of the first pressure sensor is communicated with the third detection port, and the data processor is used for measuring the pressure difference PB between the first detection port and the third detection port.
According to the device for measuring the solid phase flow in the pipeline of the gas-solid two-phase flow, disclosed by the embodiment of the utility model, the local resistance pipe section is arranged, the first detection port, the second detection port and the third detection port are arranged on the local resistance pipe section, the pressure sensor is communicated with different detection ports for performing differential pressure measurement, and then the solid phase flow is measured through the data processor.
According to some embodiments of the utility model, when the local resistance pipe section is a reducing pipe section, the first detection port and the second detection port are located in a first section of the reducing pipe section, the third detection port is located in a second section of the reducing pipe section, and the diameter of the first section is larger than that of the second end.
According to some embodiments of the utility model, the local resistance tube section is a venturi tube section or a directly variable diameter tube section.
According to some embodiments of the utility model, 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 two sides of an 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 pipe section.
According to some embodiments of the utility model, the measuring device further comprises an automatic cleaning device in communication with the orifice plate of the orifice plate tube section for cleaning the orifice plate.
Additional aspects and advantages of the utility model 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 utility model.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a device for measuring the flow rate of a solid phase in a pipe for a gas-solid two-phase flow according to one embodiment of the present invention;
FIG. 2 is a schematic view of a device for measuring the flow rate of a solid phase in a line for a gas-solid two-phase flow according to another embodiment of the present invention;
FIG. 3 is a schematic view of a device for measuring the solid phase flow rate in a line for a gas-solid two-phase flow according to yet another embodiment of the present invention;
FIG. 4 is a schematic diagram 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 diagram 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 process of a method for measuring solid phase flow rate in a gas-solid two-phase flow according to an embodiment of the present invention.
Reference numerals:
1. local resistance pipeline section, 2, flow measurement system, 3, data processor, 4, first detection mouth, 5, second detection mouth, 6, third detection mouth, 7, first pressure sensor, 8, second pressure sensor, 9, self-cleaning system, 10, venturi, 11, direct reducing pipe, 12, orifice plate.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The following describes an apparatus for measuring a solid phase flow rate in a pipe for a gas-solid two-phase flow according to an embodiment of the present invention with reference to fig. 1 to 3.
The device for measuring the solid phase flow in the pipeline of the gas-solid two-phase flow 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 processor.
The local resistance pipe section can be suitable for being communicated with a gas-solid two-phase flow pipeline to be detected and used for generating local resistance, the first detection port and the second detection port are both positioned at the front resistance 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 for measuring the pressure difference PA between the pressure at the first detection port and the atmospheric pressure.
The third detects the mouth and locates the resistance back end of local resistance pipeline section, and the third detects the mouth promptly and locates the pipeline section after local resistance pipeline section produced the resistance, and second pressure sensor's first end and second detect the mouth intercommunication, and the second end detects the mouth with the third intercommunication for measure the second and detect the mouth not produce the pressure before the resistance loss and the pressure after the resistance loss differential PB between the pressure.
Further, the data processor is respectively connected with the first pressure sensor and the second pressure sensor to receive the measurement data differential pressure PA and PB of the first pressure sensor and the second pressure sensor, and calculates the solid phase flow by using the differential pressure PA and PB.
Through setting up the local resistance pipeline section, and set up first detection mouth at the local resistance pipeline section, second detection mouth and third detection mouth, utilize pressure sensor and different detection mouth intercommunications to carry out differential pressure measurement, and then carry out solid phase flow measurement through data processor, compare in the measuring device structure of the solid phase flow among the correlation technique complicated, awkward condition, this measuring device simple structure, the component part is less and the use occasion is wider, can extensively apply to in industrial occasions such as coal transport, tobacco processing, grain transport, chemical production, it is comparatively convenient to use.
As shown in fig. 1-3, in some embodiments of the utility model, the local resistance tube segments are variable diameter tube segments or orifice plate tube segments.
In some examples, as shown in fig. 1-2, when the local resistance pipe section is a reducing pipe section, the first detection port and the second detection port are located in a first section of the reducing pipe section, the third detection port is located in a second section of the reducing pipe section, and the diameter of the first section is larger than that of the second end, wherein the local resistance pipe section is a venturi pipe section or a direct reducing pipe section.
In other examples, as shown in fig. 3, 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 two sides of an 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 pipe section.
Further, in order to avoid blocking the pore plate by materials, dust and the like, the pore plate cleaning device further comprises an automatic cleaning device, and the automatic cleaning device is communicated with the pore plate of the pore plate pipe section so as to clean the pore plate.
In some embodiments, the data processor may be a computer host, or a data analysis component, and the host or the data analysis component calculates the solid phase flow rate C by using a preset formula C = K2 (PB-K1 PA) + b1, wherein K1, K2 and b1 are parameters predetermined according to preset conditions before communicating with the gas-solid two-phase flow pipeline to be measured, wherein K1 is 0.5 or more and 0.8 or less, K2 or less and-20 is 0.001 or more and b1 or less and 500 is or less.
According to some embodiments of the utility model, the data processor comprises a fitting component, and the fitting component performs fitting in advance under preset conditions to obtain a parameter K1, a parameter K2 and a parameter b1, where the preset conditions are that the local resistance pipe section conveys the same gas-solid two-phase flow as the pipeline under preset conditions of solid phase flow and gas phase flow, that is, the parameters K1, K2 and b1 are measured before the measurement 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, under the condition of known preset solid phase flow, the gas phase flow, such as the flow rate of gas, is adjusted, and the parameters K1, the parameters K2 and the parameters b1 are measured in a fitting manner.
According to some embodiments of the present invention, the fitting assembly includes a first fitting unit, and the first fitting unit fits straight lines corresponding to different sets of solid-phase flow rates respectively in a coordinate system formed by the differential pressure PA and the differential pressure PB according to different sets of solid-phase flow rates and the differential pressure PA and the differential pressure PB of each set of solid-phase flow rates at different gas-phase flow rates under the preset condition, and performs average fitting on slopes of the different straight lines to obtain a first slope and intercept values of the straight lines corresponding to the different sets of solid-phase flow rates, where the first slope is the parameter k 1.
The specific fitting process comprises the following steps: s11, fixing solid phase flow C in the gas-solid two-phase flow under a preset condition, and detecting differential pressure PA and differential pressure PB in the local resistance pipe section by adjusting different gas phase flow;
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 rates C of each group to be different, and fitting to obtain straight lines corresponding to the solid phase flow rates C of different groups;
and S14, performing slope average fitting on the straight lines corresponding to the different groups of solid phase flow rates C obtained in the step S13, and fitting to obtain a first slope and intercept values of the straight lines corresponding to the different groups of solid phase flow rates, wherein the first slope is a parameter K1.
According to some embodiments of the present invention, the fitting assembly further includes a second fitting unit, wherein the second fitting unit fits the intercept values corresponding to the different sets of solid phase flow rates and the corresponding solid phase flow rate C, which are fitted by the first fitting unit, 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 b 1.
The specific fitting process further comprises: s15, in a coordinate system with the intercept as a horizontal axis and the solid phase flow as a vertical axis, fitting the solid phase flow of different groups and the intercept value corresponding to the solid phase flow in the step S14 to obtain a straight line;
s16, calculating a second slope of a straight line obtained by fitting the solid phase flow of different groups and intercept values corresponding to the solid phase flow, wherein the second slope is a parameter K2;
s17, calculating the intercept value of the vertical axis of the straight line obtained by fitting the intercept values corresponding to the solid phase flow of different groups and the solid phase flow, wherein the intercept value is the parameter b 1.
In some embodiments, the data processor further includes a regulation 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 measured by being communicated 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 actual zero setting is performed according to the working condition, temperature and the like of the site through the correction parameter b 2.
The following describes an apparatus for measuring a solid phase flow rate in a pipe for a gas-solid two-phase flow according to an embodiment of the present invention with reference to a specific embodiment.
Referring to fig. 1, 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 1 (venturi tube 10), a flow measurement system 2 and a data processor 3. The flow measurement system 2 comprises a first detection port 4, a second detection port 5, a third detection port 6, a first pressure sensor 7 and a second pressure sensor 8, and the local resistance pipe section 1 is a venturi tube which contracts first and then expands gradually. A first detection port 4 and a second detection port 5 are arranged at the position before the pipe diameter of the Venturi tube 10 is contracted, a third detection port 6 is arranged at the position after the pipe diameter of the Venturi tube is contracted to the narrowest throat part, and the first detection port 4, the first pressure sensor 7 and the atmosphere are connected through a pipeline to measure the differential pressure PA and the corresponding pressure fluctuation; the second detection port 5, the second pressure sensor 8 and the third detection port 6 are connected through pipelines to measure the pressure difference PB and the corresponding pressure fluctuation to form a sampling pipeline. The sampled signals are connected to the data processor 3 via a circuit. When gas-solid two-phase flow flows through the pipeline, resistance loss can be generated, due to the amplification effect of the local resistance pipe section 1 (the Venturi tube 10), the generated pressure difference A, B has a more obvious linear relation, the slope and intercept of the curve have a certain linear relation with the material flow, real-time fitting parameters are generated through the principle and are packaged into the data processor 3, the pressure difference A, B is collected into the data processor through the sampling pipeline in real time, and calculation is carried out to obtain the material flow in the pipeline. Meanwhile, the material flow is calibrated by methods of filtering value, averaging, comparison iteration and the like, and is output to a display screen.
Referring to fig. 2, the solid phase flow rate measuring device 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 pipe section with a perforated plate 12 is used as a local resistance pipe section 1, and due to the characteristics of the perforated plate, the pipe section is easily blocked, so that the measuring device of the perforated plate is optimized by using an automatic cleaning device, the automatic cleaning system is an air pump, which can generate high-pressure air, the air pump is connected to the perforated plate 12 through a three-way valve and a pipe, one way of the three-way valve connected to the air pump is in a normally closed state, when the measuring device stops working, one way of the valve of the air pump is opened, the air pump is started to generate high-pressure air, the air pump blows the perforated plate 12 at high pressure, and the materials and dust attached to the perforated plate 12 are cleaned.
The method for measuring the solid phase flow rate in the gas-solid two-phase flow according to the second aspect of the utility model comprises the following steps:
s1, pre-fitting under preset conditions to obtain a parameter K1, a parameter K2 and a parameter b1, wherein the preset conditions are that gas-solid two-phase flow identical to the pipeline is conveyed in a local resistance pipe section according to preset solid phase flow and gas phase flow conditions;
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 front resistance section and the rear resistance section of the local resistance pipe section;
s5, calculating the solid phase flow C in the gas-solid two-phase flow to be measured by applying a preset formula according to the pressure difference PA and the pressure difference PB, wherein the preset formula comprises: c = k2 (PB-k 1 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, fixing solid phase flow C in the gas-solid two-phase flow under a preset condition, and detecting differential pressure PA and differential pressure PB in the local resistance pipe section by adjusting different gas phase flow;
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 rates C of each group to be different, and fitting to obtain straight lines corresponding to the solid phase flow rates C of different groups;
s14, performing slope average fitting on the straight lines corresponding to the different groups of solid phase flow rates C obtained in the step S13 to obtain a first slope and intercept values of the straight lines corresponding to the different groups of solid phase flow rates, wherein the first slope is a parameter K1;
s15, in a coordinate system with the intercept as a horizontal axis and the solid phase flow as a vertical axis, fitting the solid phase flow of different groups and the intercept value corresponding to the solid phase flow in the step S14 to obtain a straight line;
s16, calculating a second slope of a straight line obtained by fitting the solid phase flow of different groups and intercept values corresponding to the solid phase flow, wherein the second slope is a parameter K2;
s17, calculating the intercept value of the vertical axis of the straight line obtained by fitting the intercept values corresponding to the solid phase flow of different groups and the solid phase flow, wherein the intercept value is the parameter b 1.
Specifically, after the local resistance pipe section is selected, different material quantities are weighed by using an electronic scale, for example, 5 to 6 groups are weighed, and a parameter measurement experiment is performed. Uniformly feeding materials, adjusting different gas phase speeds so as to change the gas-solid ratio of gas-solid two-phase flow, recording different pressure differences PA and PB, performing linear fitting once according to different material flow rates, selecting a maximum slope and a minimum slope, performing linear fitting again according to different slopes within the range, and finely adjusting the slopes until the average value of fitting degrees of all fitting straight lines is minimum, wherein the slope at the moment is calibrated K1; at the moment, the intercepts of all the fitting straight lines are linearly fitted with the material flow for one time, the slope is the calibrated K2, and the intercept is the calibrated b 1. B1 needs to be used in different environments, and fine tuning is carried out through setting experiments to ensure the accuracy of the system.
As shown in fig. 4, when the solid phase flow rates of different groups are different, for example, the solid phase flow rate C1=100kg/h, the gas phase flow rate (wind speed) is adjusted, the pressure differences PA and PB at that time are recorded, and a straight line of the solid phase flow rate C1=100kg/h is drawn, and similarly, straight lines of the solid phase flow rate C2=200kg/h, C3=300kg/h, and C4=400kg/h are drawn in this order.
Fitting is carried out by an approach algorithm (taking the maximum value of the slope, taking the minimum value as the upper and lower limits of the interval, then continuously adjusting the slope in the range, using the slope to inversely fit the points obtained by the experiment until the average fitting degree of the straight line is the best) so that the average fitting degree of the straight line of the solid phase flow rate C1=100kg/h, C2=200kg/h, C3=300kg/h and C4=400kg/h is the best, and the slope of the straight line obtained at this moment is the first slope, namely k 1. And the points obtained by the experiment were re-fitted using the slope k1 to obtain fitted straight lines, which were plotted, as shown in fig. 5, when the corresponding vertical axis intercept values at each solid phase flow rate of C1=100kg/h, C2=200kg/h, C3=300kg/h, C4=400kg/h were recorded.
As shown in fig. 6, the intercept of all the fitted straight lines is taken as the x-axis, the solid phase flow represented by all the straight lines is taken as the y-axis, and the slope of the straight line is the second slope K2, and the intercept value corresponding to the vertical axis is the calculated b 1.
Therefore, according to the method for measuring the solid phase flow in the gas-solid two-phase flow, parameters K1, K2 and b1 are fitted in advance under preset conditions through experiments, then the local resistance pipe section is communicated with the gas-solid two-phase flow pipeline to be measured, the differential pressure PA and the differential pressure PB at the moment are detected, and the measurement of the solid phase flow is realized by applying a preset formula C = K2 (PB-K1 × PA) + b 1.
In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.
In the description of the present invention, "a plurality" means two or more.
In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.
In the description of the utility model, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means 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 rate in a pipe of a gas-solid two-phase flow and the method for measuring the solid phase flow rate in a gas-solid two-phase flow according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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 utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. A device for measuring solid phase flow in a pipeline of gas-solid two-phase flow is characterized by comprising:
the local resistance pipe section is suitable for being communicated with a gas-solid two-phase flow pipeline, and is a variable diameter pipe section or a pore plate pipe section;
the first detection port and the second detection port are both arranged at the resistance front section of the local resistance pipe section;
a first pressure sensor, a first end of which is communicated with the first detection port and a second end of which is communicated with the atmosphere, for measuring a pressure difference PA between the first detection port and the atmosphere;
the third detection port is arranged at the resistance rear section of the local resistance pipe section;
a second pressure sensor, a first end of which is communicated with the second detection port and a second end of which is communicated with the third detection port, for measuring a differential pressure PB between the second detection port and the third detection port;
and the data processor is respectively connected with the first pressure sensor and the second pressure sensor.
2. The apparatus for measuring the solid phase flow in a pipe of a gas-solid two-phase flow according to claim 1, wherein when the local resistance pipe section is a variable diameter pipe section, the first detection port and the second detection port are located at a first section of the variable diameter pipe section, the third detection port is located at a second section of the variable diameter pipe section, and the diameter of the first section is larger than that of the second section.
3. The apparatus for measuring the solid phase flow in a gas-solid two-phase flow pipeline according to claim 2, wherein the local resistance pipe section is a venturi pipe section or a directly variable diameter pipe section.
4. The apparatus for measuring the solid phase flow in a pipe for a gas-solid two-phase flow according to claim 1, wherein when the local resistance pipe section is a perforated pipe section, the first detection port and the third detection port are respectively located at both sides of a perforated plate of the perforated pipe section, and the second detection port and the first detection port are located at the same side of the perforated plate of the perforated pipe section.
5. The apparatus for measuring the solid phase flow in a gas-solid two-phase flow pipeline according to claim 4, further comprising an automatic cleaning device, wherein the automatic cleaning device is communicated with the orifice plate of the orifice plate pipe section to clean the orifice plate.
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| CN202120685648 | 2021-04-06 | ||
| CN2021206856482 | 2021-04-06 |
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