Gas-solid two-phase flow monitoring device and method

Abstract

The application discloses a kind of gas-solid two-phase flow flow monitoring devices, including measuring end and monitoring end;The measuring end includes probe, connecting rod, wind speed module and strain gauge, wherein probe is fixed on the inner wall of flow passage by connecting rod, and strain gauge is arranged on the connecting rod;Wind speed module is arranged in flow passage;The monitoring end includes control unit, control unit includes subtracter, first divider and second divider, and strain gauge and wind speed module are electrically connected with the input end of subtracter;The output end of subtracter and probe are electrically connected with the input end of first divider, and the first divider and second divider are electrically connected.The application can continuously monitor large flow particle flow online, and has good air tightness, and will not cause fluid leakage.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power plant performance, and particularly relates to a gas-solid two-phase flow monitoring device and method. BACKGROUND

[0002] When performing power plant performance test, the pulverized coal powder quantity and primary air quantity entering the furnace need to be measured. Generally, the pulverized coal powder entering the furnace is pneumatically transported by primary air. In order to make the combustion sufficient and uniform, the pulverized coal powder is generally injected by multiple layers and multiple points, so the number of coal powder pipes is relatively large. The currently used measurement method is to take isochronous and constant-speed sampling for each coal powder pipe, and then to weigh to estimate the coal powder flow in the coal powder pipe; the Pitot tube is used to measure the pressure drop to calculate the air flow velocity in the pipe.

[0003] The existing solid flow meter can only measure the solid flow, such as the weighing type flow meter, or can only intermittently measure the small flow of solid particles, such as the capacitance type flow meter, such as Chinese patent CN102889909A, or the flow resistance is too large, such as the Coriolis force flow meter.

[0004] Based on the analysis of the above prior art, it can be seen that the prior art has the following disadvantages: unable to simultaneously measure the multiphase flow, no air tightness, unable to continuously measure the large flow and stable particle flow, and the flow resistance is too large, and the measurement data is not accurate. SUMMARY

[0005] In order to solve the problems existing in the gas-solid two-phase flow detection in the prior art, the present application provides a gas-solid two-phase flow monitoring device and method, which can continuously and on-line monitor the large flow particle flow, and has good air tightness and will not cause fluid leakage.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0007] A gas-solid two-phase flow monitoring device, comprising a measurement end and a monitoring end;

[0008] The measurement end comprises a probe, a connecting rod, a wind speed module and a strain gauge, wherein the probe is fixed on the inner wall surface of the flow channel through the connecting rod, and the strain gauge is arranged on the connecting rod; the wind speed module is arranged in the flow channel;

[0009] The monitoring end comprises a control unit, the control unit comprises a subtracter, a first divider and a second divider, the strain gauge and the wind speed module are electrically connected with the input end of the subtracter; the output end of the subtracter and the probe are electrically connected with the input end of the first divider, and the first divider and the second divider are electrically connected.

[0010] As a further improvement of the present application, the probe is a sheet-shaped wear-resistant alloy.

[0011] As a further improvement of the present application, the connecting rod is arranged along the radial direction of the flow channel.

[0012] As a further improvement of the present application, the probe is arranged in the center of the flow channel, and faces the direction of the incoming flow.

[0013] As a further improvement of the present application, the strain gauge is arranged in the middle of the connecting rod.

[0014] As a further improvement of the present application, the wind speed module is arranged on one side of the connecting rod, and the set point of the wind speed module and the set point of the connecting rod are arranged on the same circular arc.

[0015] As a further improvement of the present application, the monitoring end further comprises a display, which is electrically connected with the control unit.

[0016] As a further improvement of the present application, the monitoring end further comprises an alarm, which is electrically connected with the control unit.

[0017] A detection method of a gas-solid two-phase flow flow monitoring device, comprising:

[0018] Obtaining the measurement data of the strain gauge and the wind speed module;

[0019] According to the wind speed measured by the wind speed module, the force F0 of the gas phase fluid on the probe is calculated, the actual force F1 of the probe measured by the strain gauge is the resultant force of the gas phase fluid and the solid phase particles on the probe, and the force F2 of the solid phase particles on the probe is calculated by the subtracter 11.

[0020] Obtaining the data of the output end of the subtracter 11 and the probe 1, and calculating the particle mass Δm hitting the probe per unit time according to f=Δm*v.

[0021] According to the ratio a=S1 / S0 of the probe area S0 and the through-flow area S1, the instantaneous solid phase mass flow Q=Δm*a in the flow channel is calculated.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] The gas-solid two-phase flow flow monitoring device product of the present application can solve many problems existing in previous products by arranging the probe, the wind speed module and the strain gauge in the flow channel: it can continuously monitor the large flow particle flow online, is not limited by sampling difficulties, especially can measure in real time in the flow channel, has the advantages of good air tightness and no fluid leakage. The flow resistance in the flow channel is small, and the disturbance to the flow field is small. The structure of each measurement unit is small, and it will not be blocked and does not need frequent maintenance. Real-time measurement can be performed, and real-time measurement data can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, illustrate preferred embodiments of the application and assist in explaining the application. In the drawings, like reference numerals refer to like parts throughout the several views.

[0025] Figure 1 Arrangement diagram of flow channel in measuring end of the application;

[0026] Figure 2 Schematic diagram of hardware structure of a gas-solid two-phase flow monitoring device of the application;

[0027] Figure 3 Schematic diagram of structure of monitoring end of the application DETAILED DESCRIPTION

[0028] In order for those skilled in the art to better understand the technical solutions in the application, the technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work should belong to the protection scope of the application.

[0029] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustrative purposes only and are not intended to be limiting.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0031] As shown in Figure 1 and Figure 2 The application provides a gas-solid two-phase flow monitoring device, which comprises a measuring end and a monitoring end. The measuring end comprises a probe 1, a connecting rod 2, a wind speed module 3 and a strain gauge 4. The probe 1 is fixed to the wall of the flow channel through the connecting rod 2. The wind speed module 3 is arranged in the flow channel to measure the gas phase flow rate in the flow channel.

[0032] As shown inFigure 1 As shown, probe 1 is fixed to the inner wall of the flow channel by connecting rod 2, strain gauge 4 is set on the connecting rod 2; wind speed module 3 is arranged in the flow channel;

[0033] like Figure 2 As shown, the monitoring terminal includes a control unit 10, which includes a subtractor 11, a first divider 12, and a second divider 13. The strain gauge 4 and the wind speed module 3 are both electrically connected to the input terminal of the subtractor 11. The output terminal of the subtractor 11 and the probe 1 are both electrically connected to the input terminal of the first divider 12. The first divider 12 and the second divider 13 are electrically connected.

[0034] The subtractor 11 acquires the measurement data of the strain gauge 4 and the wind speed module 3. Based on the wind speed measured by the wind speed module, the force F0 exerted by the gaseous fluid on the probe can be calculated. The actual force F1 exerted on the probe by the strain gauge is the resultant force of the gaseous fluid and solid particles on the probe. The force F2 exerted by the solid particles on the probe can be calculated by subtractor 11 by calculating F1-F0.

[0035] The first divider 12 is used to acquire data from the output of the subtractor 11 and the probe 1. The mass Δm of the particles hitting the probe per unit time can be calculated by division according to f = Δm * v.

[0036] The second divider 13 obtains the instantaneous solid mass flow rate Q = Δm*a in the flow channel based on the ratio of probe area S0 to flow area S1, a = S1 / S0.

[0037] The probe 1 is a thin, wear-resistant alloy sheet, positioned at the center of the flow channel, facing the incoming flow direction. Strain gauges 4 are mounted on the connecting rod 2 to measure its strain.

[0038] The wind speed module 3 can select a suitable wind speed measuring device according to the actual application scenario, and is not limited to any specific wind speed measuring device.

[0039] To obtain accurate measurement results, specific installation requirements need to be met for each component. Optionally, the connecting rod 2 is arranged radially along the flow channel. The probe 1 is positioned at the center of the flow channel, directly facing the incoming flow direction. The strain gauge 4 is positioned in the middle of the connecting rod 2.

[0040] The wind speed module 3 is located on one side of the connecting rod 2, and the setting point of the wind speed module 3 and the setting point of the connecting rod 2 are arranged on the same arc. This ensures that the measurement results of the wind speed module and the data of the probe 1 are error-free.

[0041] like Figure 3As shown, as an optional embodiment, the monitoring end comprises a control unit 10 and a display 20, the control unit 10 comprises a subtracter 11, a first divider 12 and a second divider 13; the subtracter 11 is used to calculate the force F0 of the gas phase fluid on the probe according to the wind speed measured by the wind speed module, the actual force F1 of the probe measured by the strain gauge is the resultant force of the gas phase fluid and the solid phase particles on the probe. Therefore, F1-F0 can calculate the force F2 of the solid phase particles on the probe.

[0042] Since the solid phase particles are completely transported by gas force, the solid phase particle flow rate is the same as the gas phase. The first divider 12 is used to calculate the mass of the particles hitting the probe per unit time according to f=Δm*v.

[0043] The second divider 13 is used to calculate the instantaneous solid phase mass flow in the flow passage according to the ratio of the probe area to the flow area.

[0044] The monitoring end also comprises a display 20, which is electrically connected with the control unit 10. Therefore, the signals of the strain gauge and the wind speed module can be collected and transmitted to the control unit 10 to realize real-time online monitoring of the solid phase mass flow, and the display 20 is used for display.

[0045] The monitoring end also comprises an alarm 30, which is electrically connected with the control unit 10, and the alarm is used to alarm when the measurement data deviates seriously. The specific control is to set a threshold value to determine whether the threshold value is exceeded, and the alarm is given when the threshold value is exceeded.

[0046] The present application does not improve the software, wherein the calculation part is realized by purchasing adder and divider, and the integrated adder and divider are purchased, and only the improvement between hardware is made. And for the field, the method of separate adder and divider is also a conventional calculation method, and the present application only combines the units of three sampling ends to realize the gas-solid two-phase flow monitoring, and the hardware improvement is protected.

[0047] The above only describes the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the technical solutions described in the foregoing embodiments can still be revised, or some technical features can be replaced equivalently. Any revision, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A detection method for a gas-solid two-phase flow monitoring device, characterized in that, The gas-solid two-phase flow monitoring device includes a measuring end and a monitoring end; The measuring end includes a probe (1), a connecting rod (2), a wind speed module (3), and a strain gauge (4). The probe (1) is fixed to the inner wall of the flow channel via the connecting rod (2), and the strain gauge (4) is mounted on the connecting rod (2). The wind speed module (3) is arranged inside the flow channel. The monitoring terminal includes a control unit (10), which includes a subtractor (11), a first divider (12), and a second divider (13). The strain gauge (4) and the wind speed module (3) are all electrically connected to the input terminal of the subtractor (11). The output terminal of the subtractor (11) and the probe (1) are both electrically connected to the input terminal of the first divider (12), and the first divider (12) and the second divider (13) are electrically connected. The detection method for a gas-solid two-phase flow monitoring device includes: Acquire measurement data from strain gauge (4) and wind speed module (3); Based on the wind speed measured by the wind speed module, the force F0 of the gaseous fluid on the probe is calculated. The actual force F1 of the probe measured by the strain gauge is the resultant force of the gaseous fluid and solid particles on the probe. By subtracting F1-F0, the force F2 of the solid particles on the probe can be calculated. Obtain the data from the output of the subtractor (11) and the probe (1), and calculate the mass Δm of the particles hitting the probe per unit time by division according to f=Δm*v; Then, based on the ratio of probe area S0 to flow area S1, a = S1 / S0, the instantaneous solid mass flow rate Q = Δm*a in the flow channel is calculated.

2. The detection method of the gas-solid two-phase flow monitoring device according to claim 1, characterized in that, The probe (1) is a thin sheet of wear-resistant alloy.

3. The detection method of the gas-solid two-phase flow monitoring device according to claim 1, characterized in that, The connecting rod (2) is arranged radially along the flow channel.

4. The detection method of the gas-solid two-phase flow monitoring device according to claim 3, characterized in that, The probe (1) is positioned at the center of the flow channel, facing the direction of the incoming flow.

5. The detection method of the gas-solid two-phase flow monitoring device according to claim 1, characterized in that, The strain gauge (4) is arranged in the middle of the connecting rod (2).

6. The detection method of the gas-solid two-phase flow monitoring device according to claim 1, characterized in that, The wind speed module (3) is set on one side of the connecting rod (2), and the setting point of the wind speed module (3) and the setting point of the connecting rod (2) are arranged on the same arc.

7. The detection method of the gas-solid two-phase flow monitoring device according to claim 1, characterized in that, The monitoring terminal also includes a display (20), which is electrically connected to the control unit (10).

8. The detection method of the gas-solid two-phase flow monitoring device according to claim 1, characterized in that, The monitoring terminal also includes an alarm (30), which is electrically connected to the control unit (10).

Images