CN109885107B - Method and device for correcting flow coefficient of control valve - Google Patents
Method and device for correcting flow coefficient of control valve Download PDFInfo
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Abstract
A method for modifying a control valve flow coefficient, comprising: step 1, pipeline signals of two pipelines are to be tested through a detection device preset on a first test pipeline; step 2, collecting and storing the signals in the step 1; step 3, the acquired data is stored in a corrected flow coefficient software system, and data processing is carried out to obtain a flow coefficient Kv and an opening and liquid level curve chart under each opening; and 4, correcting the flow coefficient of the control valve according to the obtained data. The invention can quickly correct the flow coefficient of the control valve and reduce the loss caused by the flow coefficient. The invention also comprises a device for implementing the method.
Description
Technical Field
The invention belongs to the field of fluid equipment, and particularly relates to a method and a device for correcting a flow coefficient of a control valve.
Background
The control valve is used as an important execution component in a process control system and is mainly used for controlling the on-off, flow direction, flow rate, pressure, temperature and the like of fluid in a pipeline. The control valve is widely applied to the fields of petroleum, chemical industry, electric power, pharmacy, solar photovoltaic, nuclear energy and the like. The flow coefficient of the control valve is an important process parameter and a technical index in the field of control valves and is a key for ensuring the safe and stable operation of the control valve.
The flow coefficient of the control valve is an index for measuring the flow capacity of the control valve, and the larger the flow coefficient value is, the larger the flow capacity of the control valve is, and the smaller the pressure loss when the fluid flows through the valve is. Therefore, the improper flow coefficient may cause the conditions of excessive throttling loss of the control valve, shaking of the valve body, poor response of the control valve and the like, and finally affect the safety, stability and economy of the operation of the equipment.
At present, the liquid level control effect is poor due to the fact that the flow coefficient of a control valve is abnormal in the operation of a large nuclear power unit, however, the production operation time of a nuclear power plant is reduced due to unexpected emergency shutdown accidents, and huge economic losses are caused. Therefore, the correction of the flow coefficient can ensure the safety and the economical efficiency of the operation of the nuclear power unit.
The existing correction method of the flow coefficient of the control valve is to correct the flow coefficient of a single control valve in a manual mode, however, the mode is not very accurate and can be corrected step by step only by multiple tests; and in the correction process, the uncertainty of artificial correction also increases the risk of inaccurate flow coefficient.
Disclosure of Invention
The present invention overcomes the above-mentioned shortcomings of the prior art and provides a method and apparatus for correcting a flow coefficient of a control valve, which is used for correcting the flow coefficient of the control valve.
The invention discloses a method for correcting a flow coefficient of a control valve, which comprises the following steps:
step 1, pipeline signals of two pipelines are to be tested through a detection device preset on a first test pipeline 1;
specifically, step 1 the pipeline signals of the two pipelines to be tested through the detection device preset on the first test pipeline 1 include:
a first pressure detection device PT1 preset at an inlet of a first control valve 3 in the first test pipeline 1 acquires a pressure signal P1 before the first control valve 3 and a second pressure detection device PT2 at an outlet of the first control valve 3 acquires a pressure signal P2 after the control valve;
a flow detection device FT preset in a first test pipeline 1 collects fluid flow signals Q of two pipelines;
a liquid level detection device LT preset on the fluid storage device S2 collects a liquid level signal L;
flow coefficient Kv of control valve is according to formula
Is calculated to obtain N in the formula1Is constant 0.1, rho/rho0Is the fluid relative density;
according to the ideal control valve flow coefficient Kv preset in the corrected flow coefficient software system0Comparing with the actually measured flow coefficient in the step 31, and calculating the difference value of the Kv value under the same opening degree to obtain delta Kv;
the software automatically generates a delta Kv data table by using the delta Kv and the opening degree signal in the step 2, and the data table is used as a second preset signal module for storing a second preset signal of the second control valve 4 in the software;
generating a curve graph of the opening degree and the liquid level by the opening degree signal and the liquid level signal L in the step 2;
and step 4, correcting the flow coefficient of the control valve, and specifically comprising the following steps:
a first preset opening signal is used for sending a signal to a first control valve 3, a second preset opening signal is used for sending a signal to a second control valve 4, a stop valve 5 positioned on a second fluid storage device S2 is kept fully opened, and the pre-valve pressure P1, the post-valve pressure P2, the fluid flow Q1 and the liquid level signal L under each opening are collected;
calculating the flow coefficient Kv of the control valve at the moment according to a flow coefficient formula;
software automatically generates a flow coefficient data table, wherein the data table is the corrected flow coefficient;
and according to the acquired liquid level signal L and the opening signal, generating an opening and liquid level curve graph by the software system.
In the data processing process, the pre-valve pressure P1, the post-valve pressure P2, the fluid flow Q1 and the liquid level signal L of the control valve, which participate in calculation, are all data acquired when the pipeline is stable in operation. Due to the fact that pipeline fluid fluctuates, the control valve pre-valve pressure P1, the valve post-valve pressure P2, the fluid flow Q1 and the liquid level signal L fluctuate within a certain range in the collection process, and therefore the control valve pre-valve pressure P1, the valve post-valve pressure P2, the fluid flow Q1 and the liquid level signal L are averaged within a certain time.
The invention also provides a device for implementing the method for correcting the flow coefficient of the control valve, which comprises a first test pipeline 1, a second test pipeline 2, a first fluid storage device S1, a second fluid storage device S2, a signal acquisition and transmission device and a software system for correcting the flow coefficient;
the first test pipeline 1 comprises a first centrifugal pump B1, a first control valve 3, a first pressure detection device PT1 positioned at the inlet of the first control valve 3, a second pressure detection device PT2 positioned at the outlet of the first control valve 3 and a flow detection device FT;
the second test conduit 2 comprises a second centrifugal pump B2 and a second control valve 4;
a level detection device LT and a shut-off valve 5 located in the second fluid storage means S2;
the output end of the first pressure detection device PT1, the output end of the second pressure detection device PT2, the output end of the flow detection device FT and the output end of the liquid level detection device LT are all connected to the signal acquisition and sending device;
the signal acquisition and transmission device is a data acquisition system of National Instruments, a first output end OUT1 of the signal acquisition and transmission device is connected to the first control valve 3, a second output end OUT2 of the signal acquisition and transmission device is connected to the second control valve 4, and the signal acquisition and transmission device and the flow coefficient correction software system are in two-way communication through Ethernet; the flow coefficient correcting software system sends valve position signals required to arrive by the first control valve 3 and the second control valve 4 to the signal collecting and sending device, the signal collecting and sending device sends 4-20mA control signals to the first control valve 3 and the second control valve 4 according to the obtained valve position signals, and the opening degree of the two control valves is adjusted; and the flow coefficient correcting software system sends an acquisition signal to the information acquisition and transmission device, and the signal acquisition and transmission device receives the signal acquired by the detection device according to the received data acquisition command and sends the acquired signal back to the flow coefficient correcting software system.
The flow coefficient correcting software system is software written based on LABVIEW, and comprises a data acquisition command sending module, a data acquisition and sending device and a flow coefficient correcting module, wherein the data acquisition command sending module is used for outputting a data acquisition command to the acquisition and sending device; the control valve position control signal setting module is used for sending a set control valve position signal to the information acquisition and sending device; the input end of the data storage module is connected with the signal acquisition and transmission device and stores the data acquired by the detection device; the input end of the data processing and analyzing module is connected with the data storage module, and the data processing and analyzing module carries out the processing process of the data according to the stored data.
In the device, a first control valve 3 and a second control valve 4 are both fluid throttling equipment with intelligent positioners; the above-described installation positions of the first pressure detecting means PT1 at the inlet of the first control valve 3, the second pressure detecting means PT2 at the outlet of the first control valve 3, the flow rate detecting means FT, and the liquid level detecting means LT at the fluid storage means S2 in the piping are strictly performed in accordance with the national standard GB/T17213.9-2005.
The invention has the advantages that: the flow coefficient of the control valve can be corrected quickly and accurately, stable operation of an industrial system is guaranteed in time, and loss caused by equipment shutdown is reduced.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for correcting a flow coefficient of a control valve according to the present invention.
FIG. 2 is a block diagram of a modified control valve flow coefficient software system of the present invention.
FIG. 3 is a schematic diagram of a control valve position control signal module according to the present invention.
Fig. 4 is a schematic structural diagram of a data processing and analyzing module according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the attached drawings, but the present invention is not limited to the embodiments described herein.
As shown in fig. 1, the apparatus for implementing the method for correcting the flow coefficient of the control valve of the present invention includes a first test pipeline 1, a second test pipeline 2, a first fluid storage device S1, a second fluid storage device S2, a signal collecting and transmitting device, and a corrected flow coefficient software system; wherein the first test pipeline 1 comprises a first centrifugal pump B1, a first control valve 3, a first pressure detection device PT1 positioned at the inlet of the first control valve 3, a second pressure detection device PT2 positioned at the outlet of the first control valve 3 and a flow detection device FT; the second test conduit 2 comprises a second centrifugal pump B2 and a second control valve 2; a level detection device LT and a shut-off valve 5 located in the second fluid storage means S2; the output end of the first pressure detection device PT1, the output end of the second pressure detection device PT2, the output end of the flow detection device FT and the output end of the liquid level detection device LT are all connected to the signal acquisition and sending device; the first output end OUT1 of the signal acquisition and transmission device is connected to the first control valve 3, the second output end OUT2 of the signal acquisition and transmission device is connected to the second control valve 4, and the signal acquisition and transmission device and the flow coefficient correction software system are in bidirectional communication through Ethernet; the flow coefficient correcting software system sends valve position signals required to arrive by the first control valve 3 and the second control valve 4 to the signal collecting and sending device, the signal collecting and sending device sends 4-20mA control signals to the first control valve 3 and the second control valve 4 according to the obtained valve position signals, and the opening degree of the two control valves is adjusted; and the flow coefficient correcting software system sends an acquisition signal to the information acquisition and transmission device, and the signal acquisition and transmission device receives the signal acquired by the detection device according to the received data acquisition command and sends the acquired signal back to the flow coefficient correcting software system.
As shown in fig. 2, the corrected flow coefficient software system is software written based on the LABVIEW, and includes a data acquisition command sending module, which outputs a data acquisition command to the acquisition and sending device; the control valve position control signal setting module is used for sending a set control valve position signal to the information acquisition and sending device; the input end of the data storage module is connected with the signal acquisition and transmission device and stores the data acquired by the detection device; the input end of the data processing and analyzing module is connected with the data storage module, and the data processing and analyzing module carries out the processing process of the data according to the stored data.
As shown in fig. 3, the valve position control signal module of the control valve is composed of a first preset opening degree signal module and a second preset opening degree signal module, wherein the second preset opening degree signal module is provided by Δ Kv.
As shown in FIG. 4, the data processing and analyzing module is composed of a Kv calculating module and a preset ideal flow coefficient Kv0The module and the opening signal and liquid level signal curve module, wherein the Kv module is calculated and the ideal flow coefficient Kv is preset0And carrying out difference operation on the data in the module to obtain delta Kv, and sending the value to a second preset opening degree signal module for waiting use.
In one embodiment of the present invention, the step of modifying the flow coefficient of the control valve comprises:
pipeline signals of two pipelines to be tested through a detection device preset on the first test pipeline 1;
collecting and storing the pipeline signals;
the acquired data is stored in a corrected flow coefficient software system, and data processing is carried out to obtain a flow coefficient Kv and an opening and liquid level curve graph under each opening;
correcting the flow coefficient of the control valve according to the obtained data;
specifically, the pipeline signals of the two pipelines to be tested through the detection device preset on the first test pipeline 1 include:
a first pressure detection device PT1 preset at an inlet of a first control valve 3 in the first test pipeline 1 acquires a pressure signal P1 before the first control valve 3 and a second pressure detection device PT2 at an outlet of the first control valve 3 acquires a pressure signal P2 after the control valve;
a flow detection device FT preset in a first test pipeline 1 collects fluid flow signals Q of two pipelines;
a liquid level detection device LT preset on the second fluid storage device S2 collects a liquid level signal L;
the installation position of the detection device in the pipeline is strictly implemented according to the national standard GB/T17213.9-2005.
The signal detection device is connected with the information acquisition and transmission device to acquire data, and is connected with the flow coefficient correction software system through the Ethernet to store the data.
The specific steps for collecting are as follows: giving a signal to the first control valve 3 through a first preset opening degree signal module in a corrected flow coefficient software system, wherein the preset opening degree signal is 0, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100%; keeping a stop valve 5 on a second fluid storage device S2 fully opened, and collecting a pre-valve pressure P1, a post-valve pressure P2, a fluid flow Q and a liquid level signal L under each opening degree;
the collected data is stored in a corrected flow coefficient software system for data processing, and the specific processing process comprises the following steps:
flow coefficient Kv of control valve is according to formula
Is calculated to obtain N in the formula1Is constant 0.1, rho/rho0Is the fluid relative density;
according to the ideal control valve flow coefficient Kv preset in the corrected flow coefficient software system0The actual measured flow coefficient of step 31Comparing, and calculating the difference value of the Kv values to obtain delta Kv under the same opening;
the software automatically generates a delta Kv data table which is used as a preset signal of the second control valve 4 and stored in a second preset signal module in the software;
generating a curve graph of the opening degree and the liquid level by the opening degree signal and the liquid level signal L;
the flow coefficient of the correction control valve comprises the following specific steps:
a first preset opening signal is used for sending a signal to a first control valve 3, a second preset opening signal is used for sending a signal to a second control valve 4, a stop valve on a fluid storage device S2 is kept fully opened, and the pre-valve pressure P1, the post-valve pressure P2, the fluid flow Q1 and the liquid level signal L under each opening are collected;
calculating the flow coefficient Kv of the control valve at the moment according to a flow coefficient formula;
software automatically generates a flow coefficient data table, wherein the data table is the corrected flow coefficient;
and according to the acquired liquid level signal L and the opening signal, generating an opening and liquid level curve graph by the software system.
In the data processing process, the pre-valve pressure P1, the post-valve pressure P2, the fluid flow Q1 and the liquid level signal L of the control valve, which participate in calculation, are all data acquired when the pipeline is stable in operation. Due to the fact that pipeline fluid fluctuates, the control valve pre-valve pressure P1, the valve post-valve pressure P2, the fluid flow Q1 and the liquid level signal L fluctuate within a certain range in the collection process, and therefore the control valve pre-valve pressure P1, the valve post-valve pressure P2, the fluid flow Q1 and the liquid level signal L are averaged within a certain time.
In the above embodiment, the sequence of the signal acquisition and the data processing is not fixed, and it is also one of the embodiments of the present invention that the data acquisition and the data processing are performed simultaneously.
The case contents described in the present specification are only illustrations of implementation forms of the inventive concept, and the scope of protection of the present invention also includes equivalent technical means that can be conceived by those skilled in the art from the inventive concept.
Claims (4)
1. A method for modifying a control valve flow coefficient, comprising the steps of:
step 1, collecting pipeline signals of two pipelines to be tested through a detection device preset on a first test pipeline (1), and specifically comprising the following steps:
11. a first pressure detection device PT1 arranged at an inlet of a first control valve (3) in the first test pipeline (1) in advance collects the pressure P1 before the first control valve (3) and a second pressure detection device PT2 at an outlet of the first control valve (3) collects the pressure P2 after the first control valve (3) is controlled;
12. a flow detection device FT preset in a first test pipeline (1) collects fluid flow signals Q of two pipelines;
13. a liquid level detection device (LT) preset on the second fluid storage device (S2) collects a liquid level signal L;
and 2, acquiring and storing the signals in the step 1, wherein the signal acquisition specifically comprises the following steps:
signals are sent to the first control valve (3) through a first preset opening degree signal module in the corrected flow coefficient software system, and the preset opening degree signals are 0, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%; keeping a stop valve (5) on a second fluid storage device (S2) fully open, and collecting a pre-valve pressure P1, a post-valve pressure P2, a fluid flow Q and a liquid level signal L at each opening;
and 3, storing the acquired data in a corrected flow coefficient software system, and processing the data, wherein the data are specifically as follows:
step 31: flow coefficient Kv of control valve is according to formula
Is calculated to obtain N in the formula1Is constant 0.1, rho/rho0Is the fluid relative density;
step 32: according to the ideal control valve flow coefficient Kv preset in the corrected flow coefficient software system0Comparing with the actually measured flow coefficient in step 31, and calculating the difference between the Kv values at the same opening degree to obtain deltaKv；
Step 33: according to the step 32, calculating delta Kv and the opening signal in the step 2, automatically generating a delta Kv data table by software, wherein the data table is used as a preset signal of a second control valve (4) and stored in a second preset signal module in the software;
step 34: generating a curve graph of the opening degree and the liquid level by the opening degree signal and the liquid level signal L in the step 2, wherein the curve is not an ideal curve;
and 4, step 4: and (3) correcting the flow coefficient of the control valve according to the data obtained in the step (3), and specifically comprising the following steps:
step 41: a first preset opening signal is used for signaling a first control valve (3), a second preset opening signal is used for signaling a second control valve (4), a stop valve on a second fluid storage device (S2) is kept fully opened, and the pre-valve pressure P1, the post-valve pressure P2, the fluid flow Q1 and the liquid level signal L under each opening are collected;
step 42: calculating a flow coefficient Kv of the control valve according to the flow coefficient formula in the step 31;
step 43: according to the flow coefficient Kv of the control valve obtained in the step 42, the software automatically generates a flow coefficient data table, and the data table is the corrected flow coefficient at the moment;
step 44: and generating a curve graph of the opening degree and the liquid level according to the liquid level signal L and the opening degree signal collected in the step 41, wherein the curve graph is an ideal curve.
2. Apparatus for implementing the method of modifying a flow coefficient of a control valve of claim 1, comprising a first test conduit (1), a second test conduit (2), a first fluid storage device (S1), a second fluid storage device (S2), a signal acquisition and transmission device, and a modified flow coefficient software system;
the first test pipeline (1) comprises a first centrifugal pump (B1), a first control valve (3), a first pressure detection device (PT1) positioned at an inlet of the first control valve, a second pressure detection device (PT2) positioned at an outlet of the first control valve (3) and a flow detection device (FT);
the second test conduit (2) comprises a second centrifugal pump (B2) and a second control valve (4);
a level detection device (LT) and a shut-off valve (5) located in the second fluid storage means (S2);
the output end of the first pressure detection device (PT1), the output end of the second pressure detection device (PT2), the output end of the flow detection device (FT) and the output end of the liquid level detection device (LT) are all connected to the signal acquisition and sending device;
a first output end (OUT1) of the signal acquisition and transmission device is connected to a control signal input end of the first control valve (3), a second output end (OUT2) is connected to a control signal input end of the second control valve (4), and the signal acquisition and transmission device and the flow coefficient correction software system are in two-way communication through Ethernet; the flow coefficient correcting software system sends valve position signals required to arrive by the first control valve (3) and the second control valve (4) to the signal collecting and sending device, the signal collecting and sending device sends 4-20mA control signals to the first control valve (3) and the second control valve (4) according to the obtained valve position signals, and the opening degree of the two control valves is adjusted; the correction flow coefficient software system sends acquisition signals to the information acquisition and sending device, and the signal acquisition and sending device receives signals acquired by the first pressure detection device (PT1), the second pressure detection device (PT2), the flow detection device (FT) and the liquid level detection device (LT) according to the received data acquisition commands and sends the acquired signals back to the correction flow coefficient software system;
the flow coefficient correcting software system is software written based on LABVIEW, and comprises a data acquisition command sending module, a data acquisition and sending device and a flow coefficient correcting module, wherein the data acquisition command sending module is used for outputting a data acquisition command to the acquisition and sending device; the control valve position control signal setting module is used for sending a set control valve position signal to the information acquisition and sending device; the input end of the data storage module is connected with the signal acquisition and transmission device and stores the data acquired by the detection device; the input end of the data processing and analyzing module is connected with the data storage module, and the data processing and analyzing module carries out the processing process of the data according to the stored data.
3. The apparatus of claim 2, wherein: the first control valve (3) and the second control valve (4) are provided with fluid throttling equipment with intelligent positioners.
4. The apparatus of claim 2, wherein: the installation positions of the first pressure detection device (PT1) at the inlet of the first control valve (3), the second pressure detection device (PT2) at the outlet of the first control valve (3), the flow rate detection device (FT) and the liquid level detection device (LT) at the fluid storage device (S2) in the pipeline are implemented according to the national standard GB/T17213.9-2005.
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| CN112344072B (en) * | 2020-11-06 | 2023-10-31 | 上海熊猫机械(集团)有限公司 | Water-saving control method |
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Application publication date: 20190614 Assignee: ZHEJIANG JINERTAI TOYS Co.,Ltd. Assignor: JIANG University OF TECHNOLOGY Contract record no.: X2023980037362 Denomination of invention: A method and device for correcting the flow coefficient of control valves Granted publication date: 20211015 License type: Common License Record date: 20230704 |
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Application publication date: 20190614 Assignee: ZHEJIANG DOWAY ADVANCED TECHNOLOGY Co.,Ltd. Assignor: JIANG University OF TECHNOLOGY Contract record no.: X2023980037737 Denomination of invention: A method and device for correcting the flow coefficient of control valves Granted publication date: 20211015 License type: Common License Record date: 20230707 |
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