CN120252867A - Pressure differential flow measurement device and measurement method for cryogenic fluid - Google Patents
Pressure differential flow measurement device and measurement method for cryogenic fluid Download PDFInfo
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- CN120252867A CN120252867A CN202410003564.4A CN202410003564A CN120252867A CN 120252867 A CN120252867 A CN 120252867A CN 202410003564 A CN202410003564 A CN 202410003564A CN 120252867 A CN120252867 A CN 120252867A
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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
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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- Measuring Volume Flow (AREA)
Abstract
本发明提供一种低温流体的压差式流量测量装置及测量方法，包括管道、均流件和压差传感器，管道内沿其长度方向间隔设置多个多孔平衡板，均流件设置在相邻的两个多孔平衡板之间，压力检测装置设置有多个，压力检测装置均与管道连接，用于分别测量每个多孔平衡板的两侧低温流体的压力值；本发明通过在管道中串联的多个多孔平衡板以及多孔平衡板之间的均流件，使流经的气液两相的低温流体的混合更加均匀，管道中低温流体流经各多孔平衡板及均流件时，压差能被多次均匀地降低，每一级产生的压降不足以导致空化，有效的避免了空化效应，提高了管道下游低温流体的流量测量结果的准确性。
The present invention provides a pressure differential flow measurement device and a measurement method for a cryogenic fluid, comprising a pipeline, a flow equalizing member and a pressure differential sensor, wherein a plurality of porous balancing plates are arranged at intervals along the length direction of the pipeline, the flow equalizing member is arranged between two adjacent porous balancing plates, a plurality of pressure detection devices are arranged, and the pressure detection devices are all connected to the pipeline and are used to respectively measure the pressure values of the cryogenic fluid on both sides of each porous balancing plate; the present invention makes the mixing of the gas-liquid two-phase cryogenic fluid flowing through more uniform by connecting a plurality of porous balancing plates in series in the pipeline and the flow equalizing member between the porous balancing plates; when the cryogenic fluid in the pipeline flows through each porous balancing plate and the flow equalizing member, the pressure differential can be uniformly reduced multiple times, and the pressure drop generated at each stage is not enough to cause cavitation, thereby effectively avoiding the cavitation effect and improving the accuracy of the flow measurement result of the cryogenic fluid downstream of the pipeline.
Description
Technical Field
The invention relates to the technical field of low-temperature fluid measurement, in particular to a differential pressure type flow measuring device and a differential pressure type flow measuring method for low-temperature fluid.
Background
At present, the requirements of the rapid development of the technologies such as aerospace, liquid-air energy storage and the like on low-temperature fluid are greatly improved, and further requirements on the technology for measuring the flow of the low-temperature fluid are also met.
The physical properties such as density, viscosity and thermal conductivity of the low-temperature fluid are greatly different from those of the normal-temperature fluid, and particularly, the low-boiling point makes the low-temperature fluid very easy to gasify, and cavitation effect can be generated due to overlarge pressure drop when the low-temperature fluid passes through the throttling piece, so that the existence of gas phase is a main reason for influencing the accuracy and reliability of flow measurement, and in actual measurement, a small amount of gasification of the low-temperature fluid is unavoidable.
The prior flowmeter for low-temperature fluid mainly comprises a turbine flowmeter, a vortex flowmeter, a coriolis flowmeter orifice plate flowmeter and the like, but the flowmeter is provided with moving parts, is complex to install, adopts a separation metering method to divide the whole measuring process into a plurality of independent metering processes, has complex equipment and high cost, is easily interfered by factors such as fluid physical properties, pressure fluctuation, flow field change and the like in the measuring process, and influences the measuring precision and stability.
Disclosure of Invention
The invention provides a differential pressure type flow measurement device and a differential pressure type flow measurement method for low-temperature fluid, which are used for solving the defect that the flow measurement result of the low-temperature fluid of gas-liquid two phases is inaccurate in the prior art.
In a first aspect, the present invention provides a differential pressure type flow measurement device for cryogenic fluid, comprising:
the pipeline is internally provided with a plurality of porous balance plates at intervals along the length direction;
The flow equalization piece is arranged between two adjacent porous balance plates;
The pressure detection devices are respectively connected with the pipelines and are used for respectively measuring the pressure value of the low-temperature fluid at two sides of each porous balance plate.
According to the differential pressure type flow measuring device for the low-temperature fluid, the outer edge of the porous balance plate is connected with the inner wall of the pipeline, and a plurality of through holes are uniformly formed in the porous balance plate.
According to the differential pressure type flow measuring device for the low-temperature fluid, the pressure detecting device is a differential pressure sensor, the number of the differential pressure sensors is the same as that of the porous balance plates, the positions of the differential pressure sensors are in one-to-one correspondence, the differential pressure sensor is provided with a pair of pressure interfaces, and the pressure interfaces are respectively communicated with pipelines on two sides of the porous balance plates through pressure guiding pipes.
According to the differential pressure type flow measuring device for the low-temperature fluid, the pressure taking ports are respectively arranged on the pipelines at two sides of the porous balance plate, and the pressure guiding pipe is connected with the pressure taking ports.
According to the differential pressure type flow measuring device for the low-temperature fluid, the axial direction of the pressure guiding pipe is perpendicular to the axial direction of the pipeline.
According to the differential pressure type flow measuring device for the low-temperature fluid, the pressure guiding pipe is provided with the bending part, and the axial direction of the pressure guiding pipe at two ends of the bending part is perpendicular to the axial direction of the pipeline.
The differential pressure type flow measuring device for the low-temperature fluid further comprises a switching component, wherein one end of the switching component is connected with the pressure taking port, and the other end of the switching component is detachably connected with the pressure guiding pipe.
According to the differential pressure type flow measuring device for the low-temperature fluid, a plurality of flow equalizers are arranged, and the flow equalizers are silk screens or flow equalizers.
According to the differential pressure type flow measuring device for the low-temperature fluid, the heat insulation layer is arranged on the outer side of the pipeline.
In a second aspect, the present invention also provides a differential pressure flow measurement method of a cryogenic fluid, using a differential pressure flow measurement device of a cryogenic fluid as described in the first aspect, comprising:
Introducing a low-temperature fluid with density rho into the pipeline;
The low-temperature liquid sequentially flows through a plurality of porous balance plates and a flow equalizing piece in the pipeline, and pressure difference is generated at two sides of each porous balance plate;
measuring the pressure values of the low-temperature fluids at the two sides of each porous balance plate through a pressure detection device, and calculating the pressure difference delta P of the low-temperature fluids at the two sides of each porous balance plate;
Calculating an equivalent diameter ratio beta of each porous balancing plate, wherein the equivalent diameter ratio beta is the ratio of the sum of the areas of all through holes on each porous balancing plate to the cross sectional area A of the pipeline;
according to the pressure difference delta P and the outflow coefficient C of the low-temperature fluid at two sides of each porous balance plate, the flow q v corresponding to each porous balance plate is calculated, and the calculation formula is as follows:
The invention provides a differential pressure type flow measuring device and a measuring method of low-temperature fluid, wherein the differential pressure type flow measuring device comprises a pipeline, a flow equalization piece and a differential pressure sensor, a plurality of porous balance plates are arranged in the pipeline at intervals along the length direction of the pipeline, the flow equalization piece is arranged between two adjacent porous balance plates, the pressure detecting device is provided with a plurality of pressure detecting devices, the pressure detecting devices are connected with the pipeline and are used for measuring the pressure value of the low-temperature fluid at two sides of each porous balance plate and calculating the differential pressure of the low-temperature fluid at two sides of each porous balance plate according to the pressure value, the arrangement is that the mixture of the low-temperature fluid of gas-liquid two phases flowing through the pipeline is more uniform through the plurality of porous balance plates and the flow equalization piece connected in series in the pipeline, when the low-temperature fluid in the pipeline flows through each porous balance plate and the flow equalization piece, the differential pressure generated by each stage is insufficient to cause cavitation, cavitation effect is effectively avoided, the accuracy of the flow measuring result of the low-temperature fluid at the downstream of the pipeline is improved, and the flow measuring value of the last porous balance plate is selected as the flow measuring result of the low-temperature fluid in the pipeline.
In addition, the invention has no moving parts, simple installation, wide application range and low cost, can directly obtain measurement data, avoids complex equipment and high cost required by a separation metering method, and can effectively detect the existence of gas phase in liquid by comparing flow measurement results at the positions of the porous balance plates.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a pipeline according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a differential pressure type flow measurement device for cryogenic fluid according to an embodiment of the present invention;
Fig. 3 is a flow chart of a differential pressure type flow measurement method for a cryogenic fluid according to an embodiment of the present invention.
Reference numerals:
1. The device comprises a pipeline, a porous balance plate, a flow equalization piece, a differential pressure sensor, a pressure guiding pipe, a pressure taking port, a switching component and a connecting flange, wherein the pipeline, the porous balance plate, the flow equalization piece, the differential pressure sensor, the pressure guiding pipe, the pressure taking port, the switching component and the connecting flange are arranged in sequence.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A differential pressure type flow rate measuring apparatus and a measuring method for a cryogenic fluid according to an embodiment of the present invention are described below with reference to fig. 1 to 2.
The differential pressure type flow measuring device for the low-temperature fluid comprises a pipeline 1, a flow equalization piece 3 and a pressure detecting device.
Wherein, set up a plurality of porous balance plates 2 along its length direction interval in the pipeline 1, flow straightener 3 sets up between two adjacent porous balance plates 2, and pressure detection device is provided with a plurality ofly, and pressure detection device all is connected with pipeline 1 for measure the pressure value of every porous balance plate 2's both sides cryogenic fluid respectively.
According to the scheme, when the low-temperature fluid flow measuring device is used, low-temperature fluid is introduced into the pipeline 1, through the plurality of porous balance plates 2 connected in series in the pipeline 1 and the flow equalization piece 3 between the porous balance plates 2, the low-temperature fluid flow measuring device can be used for mixing the low-temperature fluid flowing through the last stage of porous balance plates 2 more uniformly, as the porous balance plates 2 have the characteristics of symmetrical porous structures, the obstruction to the fluid is small, the fluid distribution can be balanced effectively, vortex flow, vibration and signal noise are reduced, when the low-temperature fluid in the pipeline 1 flows through the porous balance plates 2 and the flow equalization piece 3, the pressure difference can be reduced uniformly for a plurality of times, the pressure drop generated by each stage is insufficient to cause cavitation, the cavitation effect is effectively avoided, the accuracy of the flow measurement result of the low-temperature fluid in the pipeline 1 is improved, the flow measurement result of the low-temperature fluid in the pipeline 1 can be selected as the flow measurement result of the low-temperature fluid in the last stage of the pipeline 2, the device has no moving parts, the installation is simple, the cost is low, complex equipment and high cost required by a separation measuring method is avoided, and the existence of the gas phase in the liquid can be effectively detected through comparing the flow measurement result of the porous balance plates 2.
The low-temperature fluid can be liquid with low boiling point such as liquid nitrogen, liquid hydrogen and the like and easy to gasify or liquid containing gas phase, so that the flow measuring device has wide application range.
Optionally, the pressure detection device measures the pressure of the low-temperature fluid at two sides of the porous balance plate 2 in the pipeline 1, and the flange pressure taking, the angle joint pressure taking, the diameter distance pressure taking and other modes can be adopted, and the modes are all in the prior art and can be selected according to the actual demand precision and the installation requirement. For example, a flange is used for taking pressure, a pressure taking element (such as a pressure gauge or a pressure sensor) is mounted on the flange, then the flange is connected with the pipeline 1, the pressure in the pipeline 1 is measured through the pressure taking element by using bolts or welding, or a diameter distance is used for taking pressure, the pressure in the pipeline 1 is measured by using the distance between the center line of the pressure taking port 6 and a certain specified end surface of the pipeline 1, namely the distance between the pressure taking ports 6, a proper pressure taking position is selected on the pipeline 1, the pressure taking port 6 is mounted, the distance between the pressure taking ports 6 is measured, and the measured distance value is substituted into a related formula or a calculation model to calculate the pressure value in the pipeline 1.
In this embodiment, the outer edge of the porous balancing plate 2 is connected with the inner wall of the pipe 1, for example, the pipe 1 and the porous balancing plate 2 are all circular, the outer diameter of the porous balancing plate 2 is adapted to the inner diameter of the pipe 1, so that the outer peripheral surface of the porous balancing plate 2 is connected with the inner wall of the pipe 1, and a plurality of through holes are uniformly formed in the porous balancing plate 2 for allowing the low-temperature fluid to pass through.
In some embodiments, two porous balancing plates 2 are provided, and two porous balancing plates 2 are respectively disposed at positions close to two ends of the pipeline 1, and of course, three or more porous balancing plates 2 may also be disposed, so that the porous balancing plates 2 located at the upstream of the porous balancing plates 2 in the series connection and the flow equalization member 3 between the porous balancing plates 2 can make the mixing of the low-temperature fluid of the gas-liquid two phases more uniform, and improve the accuracy of the measurement result of the downstream flowmeter.
In this embodiment, the flow equalization member 3 is provided with a plurality of flow equalization members 3, and the flow equalization members 3 may be wire mesh or flow equalization devices, so that the flow equalization members 3 are used to improve the flow state of the fluid in the pipeline 1, so that the fluid can be uniformly dispersed on the section of the pipeline 1 after passing through the flow equalization members 3, thereby reducing the problem of uneven flow velocity distribution, reducing noise and vibration in the pipeline 1, and improving the safety and stability of the transportation of the pipeline 1.
In this embodiment, the pressure detecting device is a differential pressure sensor 4, the number of the differential pressure sensors 4 is the same as that of the porous balance plates 2 and the positions of the differential pressure sensors are in one-to-one correspondence, the differential pressure sensor 4 is provided with a pair of pressure interfaces, the pair of pressure interfaces are respectively communicated with the pipelines 1 on two sides of the porous balance plates 2 through the pressure guiding pipes 5, and the axial direction of the pressure guiding pipes 5 is perpendicular to the axial direction of the pipelines 1, so that the influence of the flow of fluid on the measurement result is avoided, the flow direction of low-temperature fluid in the pipelines 1 is prevented from being not perpendicular to the flow direction of low-temperature fluid in the pressure taking pipes, and the flow of fluid generates certain impulse or vibration to the pressure taking pipes, thereby ensuring the accuracy of the measurement result.
In some embodiments, pressure taking ports 6 are respectively arranged on the pipelines 1 on two sides of the porous balance plates 2, and pressure guiding pipes 5 are connected with the pressure taking ports 6 to enable the low-temperature fluid in the pipelines 1 to be introduced into the differential pressure sensor 4 through the pressure guiding pipes 5, so as to measure the pressure difference of the low-temperature fluid on two sides of each porous balance plate 2.
Preferably, the pressure guiding tube 5 is provided with a bending portion, and the axial direction of the pressure guiding tube 5 at both ends of the bending portion is perpendicular to the axial direction of the pipe 1.
The bending part can be used for buffering the instantaneous impact of the measured medium on the spring tube in the differential pressure sensor 4, so that the mechanical structure of the digital display meter or the differential pressure sensor 4 can be well protected from being damaged, and the service life is prolonged.
Further, in order to facilitate the connection of the pressure guiding tube 5 and the pipeline 1, the pressure guiding tube further comprises a switching component 7, one end of the switching component 7 is connected with the pressure guiding opening 6, the other end of the switching component 7 is detachably connected with the pressure guiding tube 5, in some embodiments, the switching component 7 can be a switching tube and a locking nut which are connected to the pipeline 1, one end of the switching tube is in sealing connection with the pressure guiding opening 6 of the pipeline 1, for example, through welding, so as to ensure the air tightness at the pressure guiding opening 6, the other end of the switching tube is detachably connected with the pressure guiding tube 5, for example, through threaded connection, an external thread is arranged at one end, close to the pipeline 1, of the pressure guiding tube 5, a locking nut is sleeved on the switching tube, the internal thread of the locking nut is matched with the external thread of the pressure guiding tube 5, the pressure guiding tube 5 is in butt joint with the switching tube when in connection, and then the pressure guiding tube 5 is connected with the switching tube by screwing the locking nut.
So set up, through setting up adapter assembly 7 when being connected differential pressure sensor 4 and pipeline 1, only need draw pressure pipe 5 with adapter assembly 7 be connected can, differential pressure sensor 4 easy dismounting has improved use convenience and measurement of efficiency.
In this embodiment, the connecting flanges 8 are disposed at two ends of the pipe 1, so that the differential pressure type flow measuring device can be conveniently connected to the pipe 1 for low-temperature fluid, a heat insulation layer is disposed on the outer side of the pipe 1, and the heat insulation layer can be a heat insulation material with a certain thickness wrapped outside the pipe 1, for example, glass fiber, asbestos, aerogel felt, etc., and is used for reducing heat exchange with the external environment and preventing the low-temperature fluid from generating gas in the flowing process of the pipe 1.
The invention also provides a differential pressure type flow measuring method of the low-temperature fluid, and the differential pressure type flow measuring device of the low-temperature fluid can be used for measuring the flow value of each porous balance plate 2 in the pipeline 1.
Specifically, the measuring step includes:
S1, introducing low-temperature fluid with density rho into a pipeline 1;
s2, low-temperature liquid sequentially flows through the porous balance plates 2 and the flow equalization piece 3 in the pipeline 1, and pressure difference is generated on two sides of each porous balance plate 2;
s3, measuring the pressure values of the low-temperature fluids at the two sides of each porous balance plate 2 through a pressure detection device, and calculating the pressure difference delta P of the low-temperature fluids at the two sides of each porous balance plate 2;
S4, calculating the equivalent diameter ratio beta of each porous balance plate 2, wherein the equivalent diameter ratio beta is 1/2 th power of the ratio of the sum of the areas of all through holes on each porous balance plate 2 to the cross sectional area A of the pipeline 1;
S5, calculating the flow q v corresponding to each porous balance plate 2 according to the pressure difference delta P and the outflow coefficient C of the low-temperature fluid at two sides of each porous balance plate 2, wherein the outflow coefficient C of each porous balance plate 2 is a known technical parameter of the porous balance plate 2, and the calculation formula is as follows:
In some embodiments, a porous balance plate 2 is disposed in the pipeline 1 near two ends, a wire mesh is disposed in the middle of the pipeline 1, the pressure at two sides of each porous balance plate 2 is measured by a differential pressure sensor 4, a flowmeter for measuring fluid is formed by one porous balance plate 2 and the corresponding differential pressure sensor 4, and the existence of gas phase in the liquid can be effectively detected by comparing the corresponding flow values of the front porous balance plate 2 and the rear porous balance plate 2 along the flow direction of the low-temperature fluid, if the two flow values are basically equal, it is indicated that the fluid does not contain gas, if the two flow values are greatly different, it is indicated that the fluid contains gas because the low-temperature fluid has different gas-liquid mixing uniformity when flowing through each porous balance plate 2, so that the flow measurement values are different, and the porous balance plate 2 at the upstream of the pipeline 1 improves the mixing uniformity of the low-temperature fluid at the gas-liquid two phases, so that the flow measurement result at the porous balance plate 2 at the downstream is more accurate, and the flow measurement result of the low-temperature fluid in the pipeline 1 can be selected as the flow measurement result of the low-temperature fluid in the final porous balance plate 2.
The invention has simple installation, can directly obtain measurement data, avoids complex equipment and high cost required by a separation metering method, and can effectively detect the existence of gas phase in liquid by comparing flow measurement results at the positions of the porous balance plates 2.
It should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the technical solution described in the above-mentioned embodiments may be modified or some technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiments of the present invention.
Claims (10)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120507137A (en) * | 2025-07-21 | 2025-08-19 | 成都和鸿科技股份有限公司 | Guide vane flow detection mechanism and use method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120507137A (en) * | 2025-07-21 | 2025-08-19 | 成都和鸿科技股份有限公司 | Guide vane flow detection mechanism and use method |
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