CN111307227A - Crescent pore plate gas-liquid two-phase flow measuring device - Google Patents
Crescent pore plate gas-liquid two-phase flow measuring device Download PDFInfo
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- CN111307227A CN111307227A CN202010240588.3A CN202010240588A CN111307227A CN 111307227 A CN111307227 A CN 111307227A CN 202010240588 A CN202010240588 A CN 202010240588A CN 111307227 A CN111307227 A CN 111307227A
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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
- 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
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/42—Orifices or nozzles
Abstract
The invention relates to a crescent pore plate gas-liquid two-phase flow measuring device, which comprises a crescent pore plate, a pressure transmitter, a front differential pressure transmitter, a rear differential pressure transmitter, a measuring pipeline and an information processor, wherein the outer diameter of the crescent hole plate is matched with the inner diameter of the measuring pipeline and comprises a crescent notch which is fixed on the inner wall of the measuring pipeline downwards when in use, the crescent-shaped pore plate is taken as an interface, the measuring pipeline is divided into an upstream pipeline and a downstream pipeline according to the flowing direction of the fluid, a first pressure taking part is arranged on the upstream pipeline, a second pressure taking part and a third pressure taking part are arranged on the downstream pipeline in sequence, the three pressure taking positions are respectively provided with a pressure taking ring chamber, the main body of each pressure taking ring chamber is an annular cavity arranged on the pipe wall of the measuring pipeline, a plurality of pressure taking holes are formed in the inner wall of each pressure taking ring chamber, and pressure leading ports connected with external pressure leading pipes are formed in the positions of the upper portions of the outer walls of the pressure taking ring chambers. The invention has higher measurement precision.
Description
Technical Field
The invention relates to the technical field of flow measurement, in particular to a crescent pore plate gas-liquid two-phase flow measurement device.
Background
The gas-liquid two-phase flow is one kind of multiphase flow and is widely used in the fields of natural gas, petroleum, chemical industry, nuclear energy, aerospace and the like. Different from single-phase flow, gas and liquid are contained in gas-liquid two-phase flow at the same time, when the gas-liquid two-phase flow and the liquid flow at the same time, because the medium characteristics of two-phase flow have larger difference, the physical parameters such as friction coefficient, fluid density, viscosity and the like are different, and the two-phase flow and the single-phase flow show quite complicated characteristics due to interaction and mutual influence, a plurality of criteria relations and analysis methods in the single-phase flow can not be directly applied to the research of the gas-liquid two-phase flow. Meanwhile, the detection difficulty of the gas-liquid two-phase flow parameters is very high under the influence of various working condition factors such as gravity, temperature, pressure, split-phase flow and the like. In the gas-liquid two-phase flow, different flow rates, pressures, pipeline arrangement conditions and pipeline geometric shapes can cause different shapes of phase interfaces, and different flow patterns are formed. The gas-liquid two-phase flow pattern in the horizontal circular pipeline includes bubble flow, slug flow, plug flow, stratified flow, annular flow, mist flow, and the like.
In China, the majority of natural gas wells are low-yield gas wells, because of low yield, the wellhead flow pattern of the natural gas wells is mainly stratified flow, and cheap and economic gas-liquid two-phase flow meters are needed, while the existing gas-liquid two-phase flow meters in the market are mainly applied to high-yield gas wells because of high price.
The prior art has the following defects: one of the current applications in industrial fields is to directly measure the two-phase fluid with low liquid content by using a single-phase flowmeter, such as a precession vortex or a turbine constant velocity flowmeter, and the measurement precision is obviously influenced by the liquid content, so the measurement precision is poor; the other gas-liquid two-phase flow meter takes differential pressure type flow meters such as a Venturi, an orifice plate and a nozzle as measurement bases, and is designed in an axisymmetric structure, so that higher measurement accuracy can be achieved under the working condition of a high-yield gas well and a low liquid content rate, and the gas-liquid two-phase flow meter is not suitable for the actual pipeline flow field condition under the working condition of a low-yield gas well and a high liquid content rate, and the measurement accuracy is low. This type of gas-liquid two-phase flow meter is often the manufacturing cost higher, is not convenient for daily use.
Disclosure of Invention
The invention aims to provide a structural design of a non-axisymmetric flow-simulating throttling piece according to an interaction rule between gas-liquid two-phase fluids, the throttling piece is named as a crescent orifice plate, and a gas-liquid two-phase flow measuring device is provided on the basis of the throttling piece. The invention can realize accurate measurement of gas-liquid two-phase online inseparable, and solves the problems that the traditional gas-liquid two-phase flow meter is often higher in manufacturing cost, inconvenient to use in daily life, low in measurement precision, poorer in measurement efficiency and the like. The invention adopts the following technical scheme:
a crescent pore plate gas-liquid two-phase flow measuring device comprises a crescent pore plate, a pressure transmitter, a front differential pressure transmitter, a rear differential pressure transmitter, a measuring pipeline and an information processor, wherein the outer diameter of the crescent pore plate is matched with the inner diameter of the measuring pipeline and comprises a crescent notch, the notch is fixed on the inner wall of the measuring pipeline downwards when in use, the crescent pore plate is taken as an interface, the measuring pipeline is divided into an upstream pipeline and a downstream pipeline according to the flow direction of fluid, the upstream pipeline is provided with a first pressure taking part, the downstream pipeline is sequentially provided with a second pressure taking part and a third pressure taking part, three pressure taking parts are respectively provided with a pressure taking ring chamber, the main body of each pressure taking ring chamber is an annular cavity body opened on the pipe wall of the measuring pipeline, the inner wall of each pressure taking ring chamber is provided with a plurality of pressure taking holes, and the outer wall of each pressure taking ring chamber is provided with pressure ports connected with external pressure introducing pipes, get the drain that the outer wall of pressure ring offered the external blow off pipe of connecing by lower position, the blowoff valve is installed to the end department of blow off pipe, the first pressure of getting department and second get the pressure pipe that the department connects out and connect preceding differential pressure transmitter respectively, the second is got the pressure and is managed the pressure pipe that the department and third get the pressure and connect back differential pressure transmitter respectively, the first pressure of getting department connects out and presses the pipe and be connected with pressure transmitter, and two differential pressure transmitter and pressure transmitter's detected signal transmit to information processor.
Preferably, the throttling height of the crescent orifice plate and the inner radius of the measuring pipeline are the same, and the crescent orifice plate is as thin as possible under the condition of meeting the rigidity requirement. The ratio R/h of the excircle radius R and the center distance h of the crescent notch part of the crescent hole plate is 1.07-4.45. The equivalent throttle ratio of the crescent-shaped orifice plate is 0.35-0.65. The distance between the first pressure taking position and the upstream end face of the crescent pore plate is 0.5-1 time of the inner diameter of the pipeline, the distance between the second pressure taking position and the downstream end face of the crescent pore plate is 0.5-2 times of the inner diameter of the pipeline, and the distance between the third pressure taking position and the downstream end face of the crescent pore plate is 5-10 times of the inner diameter of the pipeline. A temperature transmitter is fixed on the pipe wall of the measuring pipeline, and the measuring signal of the temperature transmitter is sent to the information processor.
The invention provides a crescent-hole plate gas-liquid two-phase flow measuring device, which has the following advantages compared with the prior art:
(1) the invention utilizes a non-axisymmetric flow-imitating crescent-shaped orifice plate 10 to throttle gas phase flow, and regulates the liquid phase flow state by gas flow to form two-phase flow with obvious difference, so that the gas phase and the liquid phase have better identifiability, and the aim of widening the measurement range of the volume liquid content can be achieved.
(2) According to the invention, the upstream pipeline and the downstream pipeline where the crescent moon pore plate 10 is located are respectively provided with the first pressure taking part, the second pressure taking part and the third pressure taking part, pressure taking can be respectively carried out through the first pressure taking part, the second pressure taking part and the third pressure taking part, so that the measurement of two different differential pressure values of the front differential pressure and the rear differential pressure is realized, meanwhile, relevant flow parameters of a gas phase and a liquid phase in a gas-liquid two-phase flow can be conveniently and effectively calculated through the two different differential pressure values by utilizing a relevant algorithm, and the non-axisymmetric structure of the crescent moon pore plate 10 is extremely suitable for a stratified flow in the gas-liquid two-phase flow, so that the stability of effective measurement is convenient, and the measurement precision and the measurement efficiency are further ensured.
(3) The invention can realize accurate measurement of gas-liquid two-phase separation on line, and has very important significance for optimizing production process, reducing production development cost and improving control management level.
Drawings
FIG. 1 is a schematic view of the overall structure of a crescent-shaped orifice plate gas-liquid two-phase flow measuring device;
FIG. 2 is an overall left side view of a crescent-orifice plate gas-liquid two-phase flow measuring device;
FIG. 3 is a detailed view of a crescent-shaped pore plate in the crescent-shaped pore plate gas-liquid two-phase flow measuring device;
FIG. 4 is a view showing the structure of a crescent-shaped orifice plate;
FIG. 5 is a sectional view B-B of the third pressure ring extraction chamber 15 of FIG. 1;
FIG. 6 is a view of the orifice plate throttling element;
FIG. 7 is a schematic diagram of a crescent orifice throttling gas-liquid two-phase fluid principle;
FIG. 8 is a flow state diagram of a gas-liquid two-phase fluid before and after passing through a crescent-shaped orifice plate;
FIG. 9 shows the gas-liquid two-phase measurement results (front differential pressure Δ P) of the crescent orifice plate and the segmental orifice plate according to the present invention1) Comparing the images;
FIG. 10 shows the gas-liquid two-phase measurement results (post differential pressure Δ P) of the crescent orifice plate and the segmental orifice plate according to the present invention2) Comparing the images;
fig. 11 is a comparison graph of gas-liquid two-phase measurement results (K values) of the crescent-orifice plate gas-liquid two-phase flow measurement device and the venturi two-phase flow meter of the present invention.
The reference numbers in the figures illustrate: 1, a pressure transmitter; 2 front differential pressure transmitter; 3, a differential pressure transmitter;
4, a temperature transmitter; 5, three valve banks; 6 a first pressure ring taking chamber; 7, a pressure guiding pipe; 8, a sewage discharge pipe; 9 a blowdown valve; 10 crescent hole plate; 11 measuring the pipeline; 12, pressure tapping; 13 information processor 14 second pressure ring taking chamber 15 third pressure ring taking chamber;
t the thickness of the crescent hole plate; r, the excircle radius of the crescent hole plate; r measuring the inner radius of the pipeline; h, the distance between the centers of circles; a, the throttle height of a crescent orifice plate;
ΔP1front differential pressure; delta P2Back differential pressure; k front differential pressure/back differential pressure;
a gas phase flow area; b liquid phase flow area.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1-5, the present invention provides a structural design and corresponding technical solution: a crescent pore plate gas-liquid two-phase flow measuring device comprises a crescent pore plate 10, a pressure transmitter 1, a front differential pressure transmitter 2, a rear differential pressure transmitter 3, a measuring pipeline 11 and an information processor 13, wherein a temperature transmitter 4 is installed at the lower end of the information processor 13, a pipeline at the upper part of the crescent pore plate 10 is provided with a first pressure taking part, a pipeline at the lower part of the crescent pore plate 10 is sequentially provided with a second pressure taking part and a third pressure taking part, pressure leading pipes 7 connected from the first pressure taking part and the second pressure taking part are respectively connected to the front differential pressure transmitter 2, pressure leading pipes 7 connected from the second pressure taking part and the third pressure taking part are respectively connected to the rear differential pressure transmitter 3, a three-valve set 5 is installed at the end of each pressure leading pipe 7, and the high-pressure end of the front differential pressure transmitter 2 is connected with the pressure transmitter 1.
The invention adopts a ring chamber pressure taking mode, a plurality of groups of pressure taking holes 12 are arranged on the upstream pipeline and the downstream pipeline, and a plurality of groups of internal pressure taking holes 12 are respectively structurally connected with a first pressure taking ring chamber 6, a second pressure taking ring chamber 14 and a third pressure taking ring chamber 15 on the periphery. Fig. 5 shows an example of a third pressure extraction ring chamber 15, four pressure extraction holes 12 are provided, and four pressure extraction holes 12 are installed on the pipe wall of the same plane perpendicular to the axis at each pressure extraction position of the upstream pipeline and the downstream pipeline, so that the efficiency and the accuracy of measurement are ensured; two pressure taking holes 12 are arranged at each pressure taking position of the upstream pipeline and the downstream pipeline and the maximum diameter position of the axis in the horizontal direction, and two pressure taking holes 12 are arranged at each pressure taking position of the upstream pipeline and the downstream pipeline and the maximum diameter position of the axis in the vertical direction. The device is characterized in that pressure guiding openings connected with an external pressure guiding pipe 7 are formed in the upper portion of the vertical axis of the ring chamber, a sewage draining opening connected with an external sewage draining pipe 8 is formed in the lower portion of the vertical axis of the ring chamber, and a sewage draining valve 9 is installed at the end of the sewage draining pipe 8.
The throttling part of the crescent hole plate 10 faces to the lower part of the horizontal pipeline, and the equivalent throttling ratio of the crescent hole plate 10 is 0.35-0.7, so that the throttling efficiency is improved; the distance between the first pressure taking position and the upstream end face of the crescent pore plate 10 is 0.5-1 time of the inner diameter of the pipeline, the distance between the second pressure taking position and the downstream end face of the crescent pore plate 10 is 0.5-2 times of the inner diameter of the pipeline, and the distance between the third pressure taking position and the downstream end face of the crescent pore plate 10 is 5-10 times of the inner diameter of the pipeline, so that the measurement precision is effectively ensured.
Crescent hole plate based on the inventionTheoretical analysis such as the theory of operation, the pressure taking mode of gas-liquid two-phase flow measuring device adopts computational fluid dynamics simulation (CFD) method, researches the influence of the cross-sectional shape of crescent orifice plate 10 on measuring pipeline internal flow field and differential pressure signal. As shown in table 1, taking an equivalent throttling ratio of the crescent orifice plate 10 as an example of 0.55, different computational fluid dynamics simulation models are obtained by changing each structural parameter on the cross-sectional shape of the crescent orifice plate 10, flow field simulation is performed on each model, pressure values at a first pressure taking position and a second pressure taking position are extracted, and a front differential pressure Δ P is calculated1The value is obtained. The data in the table are compared to obtain: when the restriction height a of the crescent orifice plate and the inner radius r of the measuring pipeline take the same value and the thickness t of the crescent orifice plate takes a smaller value, the inner flow field of the measuring pipeline is most stable, so that a stronger differential pressure signal is generated.
The invention provides the section parameter values of the crescent-shaped orifice plate 10 with better measurement performance under the pipe diameters of DN50 and DN100, as shown in Table 2. In different measuring pipelines, the throttle height a of the crescent-shaped orifice plate is kept equal to the inner radius R of the measuring pipeline, and when the equivalent throttle ratio is between 0.35 and 0.65, the ratio R/h of the excircle radius R of the crescent-shaped orifice plate and the center distance h is between 1.07 and 4.45, and a good measuring effect can still be achieved.
Since structural parameters such as the crescent hole plate thickness t, the crescent hole plate excircle radius R, the measuring pipeline inner radius R, the centre distance h and the crescent hole plate throttling height a on the section of the crescent hole plate 10 simultaneously influence the measuring performance of the invention, the structural parameters can be correspondingly adjusted according to the actual use condition and the processing technology level.
The working principle is as follows: when the pressure measuring device is used, gas and liquid are driven to circulate in the measuring pipeline 11, under the action of the pressure guiding pipe 7, an initial pressure value in the measuring pipeline 11 is effectively converted into an electric signal through the pressure transmitter 1, the subsequent detection work is conveniently and efficiently carried out, through the crescent-shaped pore plate 10 arranged in the measuring pipeline 11, different differential pressure values are driven to form on two sides of the crescent-shaped pore plate 10 in actual use, then the front differential pressure transmitter 2 and the rear differential pressure transmitter 3 are started, in use, under the auxiliary action of the pressure guiding pipe 7, values are obtained through the two pressure taking holes 12 at each pressure taking position of the upstream pipeline and the downstream pipeline and the maximum diameter position of the axis in the horizontal direction, and then the values are obtained again through the two pressure taking holes 12 at each pressure taking position of the upstream pipeline and the downstream pipeline and the maximum diameter position of the axis in the vertical direction, so that the differential pressure value in the measuring pipeline 11, and the related flow parameters of the gas phase and the liquid phase in the gas-liquid two-phase flow can be conveniently and effectively calculated by using the related algorithm and the information processor 13.
The non-axisymmetric structure of the imitation flow type of the crescent orifice plate 10 is extremely suitable for stratified flow and asymmetric annular flow in gas-liquid two-phase flow, and effectively ensures the measurement accuracy and the measurement efficiency. As shown in fig. 7, the gas-liquid two-phase fluid flows through the pipeline from right to left, under the determined gas phase flow rate and pressure conditions, along with the difference of liquid content, the gas-liquid two-phase flow pattern is basically laminar flow at the upstream of the crescent pore plate 10, the liquid phase is below the pipeline, and the gas phase is above the pipeline; in the process of passing through the crescent orifice plate 10, the liquid phase flow area B in the gas-liquid two-phase fluid is kept unchanged, while the gas phase flow area A is obviously changed, and compared with the throttling action of the crescent orifice plate 10, the change rate of A is obviously increased; according to the fluid mechanics continuity equation and the Bernoulli equation, along with the obvious change of the gas phase flow area A, the gas phase flow velocity can be obviously improved, and the pressure is obviously reduced.
Due to the increase of the flow velocity of the gas phase, the gas phase can also regulate the flow state of the liquid phase, the gas can not only enter the liquid, but also carry the liquid to flow, and the swirling flow of the gas can also generate entrainment effect on the liquid, so that the gas-liquid two-phase fluid presents a bubble flow, annular flow to annular fog flow and other fluid flow patterns with obvious difference along with different influences of the gas on the liquid flow at the downstream of the crescent plate 10, as shown in fig. 8, the pressure is 1MPa, the gas phase flow is 71m3And/h, the flow states of the gas-liquid two-phase fluid before and after passing through the crescent pore plate 10 are obviously and differentially changed under the condition of different volume liquid contents.
The gas phase and the liquid phase generated by throttling the crescent hole plate 10 interact with each other to ensure that the front differential pressure delta P1The liquid content of the liquid increases obviously with the increase of the volume liquid content. When the gas-liquid two-phase fluid flows through the crescent hole plate 10 to enter the pressureAfter the recovery phase, the gas phase and the liquid phase form a deceleration pressurization process, and a back differential pressure delta P is generated2The process is carried out in a constant-diameter pipe without new chokes acting on the flow, so Δ Ρ2Gradually increases with the increase of the liquid phase content and is far below delta P1The experimental data are shown in table 3.
When the section parameters of the crescent-shaped pore plate 10, namely the excircle radius R and the centre distance h of the crescent-shaped pore plate are infinite values, the throttling element can also be called a segmental pore plate, as shown in FIG. 6. The segmental orifice plate throttling element is basically used for single-phase fluid measurement and is firstly used for two-phase fluid measurement in the invention. As shown in fig. 9 and 10, the gas-liquid two-phase measurement results of the crescent pore plate and the round segmental pore plate under the same working condition are compared based on the same measurement pipe diameter and the same installation condition. Under the same gas phase flow velocity, along with the change of the volume liquid content, the output front differential pressure and the output back differential pressure of the crescent pore plate have obvious difference and more stable change trend, so the method has obvious measurement advantages in a larger two-phase flow measurement range, and particularly has great influence on improving the measurement precision of the low liquid content gas-liquid two-phase flow.
As shown in fig. 11, the measurement results of the venturi two-phase flow meter and the present invention in the same gas-liquid two-phase flow range are compared based on the same measurement pipe diameter and the same installation condition. Under the same gas phase flow velocity, the difference of the front differential pressure and the back differential pressure is described by adopting the ratio K of the front differential pressure to the back differential pressure, along with the change of the volume liquid content, the measured K value of the Venturi two-phase flow meter has an obvious inflection point when the volume liquid content is 5-6 percent, but the measured K value of the invention has no inflection point and has more stable change trend, so the invention has obvious measurement advantages in a larger two-phase flow measurement range, and particularly has larger influence on the measurement precision of the high liquid content gas-liquid two-phase flow.
TABLE 1 simulation model and results of different crescent hole plate section shapes
TABLE 2 crescent hole plate section parameter values under different pipe diameters
TABLE 31 MPa pressure Experimental test data for same gas phase flow and different volume liquid contents
Table 4 calibration data of the crescent orifice plate gas-liquid two-phase flow measuring device in DN50 gas-liquid two-phase
The calibration results of the better static test obtained according to the structural parameters of the model 3 are shown in table 4, and the gas phase and the liquid phase in the gas-liquid two-phase flow with the volume liquid content in a wider range (0-15%) can achieve better measurement accuracy, wherein the gas phase flow measurement error is within +/-5%, and the liquid phase flow measurement error is within +/-10%.
Claims (6)
1. A crescent pore plate gas-liquid two-phase flow measuring device comprises a crescent pore plate, a pressure transmitter, a front differential pressure transmitter, a rear differential pressure transmitter, a measuring pipeline and an information processor,
the outer diameter of the crescent pore plate is matched with the inner diameter of the measuring pipeline and comprises a crescent notch, the notch is fixed on the inner wall of the measuring pipeline downwards when in use, the crescent pore plate is taken as an interface, the measuring pipeline is divided into an upstream pipeline and a downstream pipeline according to the fluid flow direction, the upstream pipeline is provided with a first pressure taking part, the downstream pipeline is sequentially provided with a second pressure taking part and a third pressure taking part, three pressure taking parts are respectively provided with a pressure taking ring chamber, the main body of each pressure taking ring chamber is an annular cavity body arranged on the pipe wall of the measuring pipeline, the inner wall of each pressure taking ring chamber is provided with a plurality of pressure taking holes, the upper position of the outer wall of each pressure taking ring chamber is provided with a pressure leading port connected with an external pressure leading pipe, the outer wall of each pressure taking ring chamber is provided with a drain port connected with an external drain pipe close to the lower position, the end of the drain pipe is provided with a drain valve, the pressure leading pipes connected from the first pressure taking part and, the pressure leading pipes connected to the second pressure taking part and the third pressure taking part are respectively connected to the back differential pressure transmitters, the pressure leading pipes connected to the first pressure taking part are connected with the pressure transmitters, and detection signals of the two differential pressure transmitters and the pressure transmitters are transmitted to the information processor.
2. The device according to claim 1, wherein the restriction height of the crescent orifice plate and the inner radius of the measuring pipeline are the same, and the crescent orifice plate is as thin as possible under the condition of meeting the rigidity requirement.
3. The device according to claim 1, wherein the ratio R/h of the outer circle radius R of the crescent-shaped notch part of the crescent-shaped orifice plate to the center distance h is 1.07-4.45.
4. The apparatus of claim 1, wherein the crescent aperture plate has an equivalent throttling ratio of 0.35-0.65.
5. The device according to claim 1, wherein the first pressure taking place is 0.5 to 1 times the inner diameter of the pipeline from the upstream end face of the crescent orifice plate, the second pressure taking place is 0.5 to 2 times the inner diameter of the pipeline from the downstream end face of the crescent orifice plate, and the third pressure taking place is 5 to 10 times the inner diameter of the pipeline from the downstream end face of the crescent orifice plate.
6. The apparatus of claim 1, wherein a temperature transmitter is fixed to a wall of the measuring pipe, and a measurement signal thereof is fed to the information processor.
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| CN112525307A (en) * | 2020-11-18 | 2021-03-19 | 苏州热工研究院有限公司 | Online monitoring device and monitoring method for performance of orifice valve |
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| CN112525307A (en) * | 2020-11-18 | 2021-03-19 | 苏州热工研究院有限公司 | Online monitoring device and monitoring method for performance of orifice valve |
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Effective date of registration: 20220302 Address after: No. 255, Wanglong Road, high tech Industrial Park, Xindu District, Chengdu, Sichuan 610000 Applicant after: Chengdu Houhe Precision Measurement Technology Co.,Ltd. Address before: 300192 1805-1808, Hetong building, north of the middle section of Anshan West Road, Nankai District, Tianjin Applicant before: TIANJIN TJ. UNI TAIHE AUTOMATION CONTROL & INSTRUMENT Co.,Ltd. |