Method and system for acquiring flow coefficient of regulating valve

Abstract

The invention discloses a regulating valve flow coefficient obtaining method and system, and relates to the technical field of regulating valve parameter measurement. The method comprises the steps that the inlet and outlet pressure difference of a standard throttling hole is controlled to change according to a first preset condition, the first inlet and outlet pressure difference of the standard throttling hole and the first flow corresponding to each first inlet and outlet pressure difference are continuously collected in real time, the flow coefficient corresponding to each second inlet and outlet pressure difference is calculated according to the first inlet and outlet pressure difference and the first flow corresponding to each first inlet and outlet pressure difference, and then the correction coefficient corresponding to each first inlet and outlet pressure difference is calculated; controlling the opening degree of the to-be-tested regulating valve to change according to a second preset condition, continuously collecting second inlet and outlet pressure differences of the to-be-tested regulating valve and second flow corresponding to each second inlet and outlet pressure difference in real time, calculating to obtain a flow coefficient corresponding to each second inlet and outlet pressure difference, and correcting by using a corresponding correction coefficient to obtain a flow coefficient corresponding to each second inlet and outlet pressure difference; the calculated flow coefficient of the measured regulating valve is corrected through the correction coefficient, and the accuracy of the final flow coefficient can be improved.

Description

Background Art

[0002] At present, when measuring and calculating the Cv (flow coefficient) curve of a control valve (such as a fuel control valve), the method used is: first, several points are taken within the working range of the control valve, and then the pressure, flow and other parameters of each point are measured to calculate the Cv value of the fuel control valve. Finally, these points are connected together by curve fitting to draw the Cv curve of the control valve. The precision and accuracy of the Cv curve depends entirely on the number of points taken and the accuracy of the measurement system.

[0003] The following is an explanation of the fuel regulating valve of a gas turbine:

[0004] In actual application, the gas turbine calculates the fuel regulating valve opening corresponding to the required fuel under various working conditions of the gas turbine according to the Cv curve given by the fuel regulating valve, and controls the fuel regulating valve to open to the calculated opening, thereby controlling the fuel flow entering the combustion chamber. Due to the poor precision and accuracy of the traditional method of taking points to calculate the Cv curve of the fuel regulating valve, after the gas turbine controls the fuel regulating valve to open to the calculated opening, the actual fuel supplied is very different from the fuel required by the gas turbine, which eventually leads to the failure of the gas turbine to start due to insufficient or excessive fuel supply. In severe cases, the gas turbine may be damaged. It is necessary to repeatedly correct and adjust the Cv curve of the fuel regulating valve in the gas turbine control system. Only after multiple corrections and adjustments can the use requirements be met. Due to the influence of factors such as processing errors, the Cv curve of each fuel regulating valve of the same fuel regulating valve is different, so the Cv curve needs to be repeatedly corrected in the system each time. These factors seriously affect the testing, maintenance and use of gas turbines. Summary of the invention

[0005] The technical problem to be solved by the present invention is to address the deficiencies of the prior art and specifically provide a method and system for obtaining the flow coefficient of a regulating valve, as follows:

[0006] 1) In the first aspect, the present invention provides a method for obtaining a flow coefficient of a regulating valve, and the specific technical solution is as follows:

[0007] The inlet and outlet pressure difference of the standard throttle hole is controlled to change according to the first preset condition, the first inlet and outlet pressure difference of the standard throttle hole and the first flow corresponding to each first inlet and outlet pressure difference are collected in real time and continuously, and the flow coefficient corresponding to each first inlet and outlet pressure difference and each first inlet and outlet pressure difference are calculated according to each first inlet and outlet pressure difference and the first flow corresponding to each first inlet and outlet pressure difference, and the correction coefficient corresponding to each first inlet and outlet pressure difference is calculated based on the flow coefficient corresponding to each first inlet and outlet pressure difference and the standard flow coefficient corresponding to each first inlet and outlet pressure difference, wherein the first flow refers to: the flow of the medium flowing through the standard throttle hole;

[0008] The opening of the tested regulating valve is controlled to change according to the second preset condition, and the second inlet and outlet pressure differences of the tested regulating valve and the second flow corresponding to each second inlet and outlet pressure difference are continuously collected in real time. According to each second inlet and outlet pressure difference and the second flow corresponding to each second inlet and outlet pressure difference, the flow coefficient corresponding to each second inlet and outlet pressure difference is calculated, and the corresponding correction coefficient is used to correct it to obtain the final flow coefficient corresponding to each second inlet and outlet pressure difference, wherein the second flow refers to: the flow of the medium flowing through the tested regulating valve.

[0009] The beneficial effects of the method for obtaining the flow coefficient of a regulating valve provided by the present invention are as follows:

[0010] By correcting the calculated flow coefficient of the measured regulating valve through the correction coefficient, the accuracy of the final flow coefficient can be improved. The present invention can effectively solve the technical problem that the Cv curve cannot be quickly and accurately measured and calculated during the maintenance or research and development process of the fuel regulating valve of the gas turbine.

[0011] On the basis of the above scheme, a method for obtaining a flow coefficient of a regulating valve of the present invention can also be improved as follows.

[0012] Further, the method further includes: determining a time difference between a first moment and a second moment, wherein the first moment refers to the moment when a control signal for controlling the opening of the measured regulating valve is issued, and the second moment refers to the moment when the measured regulating valve moves to a position corresponding to the opening of the control signal;

[0013] Before calculating the flow coefficient corresponding to each second inlet and outlet pressure difference, it also includes:

[0014] According to the time difference, all the second flow rates are translated to obtain a new second flow rate corresponding to each second inlet and outlet pressure difference;

[0015] According to each second inlet and outlet pressure difference and the second flow rate corresponding to each second inlet and outlet pressure difference, the flow coefficient corresponding to each second inlet and outlet pressure difference is calculated, including:

[0016] According to each second inlet and outlet pressure difference and the new second flow rate corresponding to each second inlet and outlet pressure difference, the flow coefficient corresponding to each second inlet and outlet pressure difference is calculated.

[0017] The beneficial effect of adopting the above further solution is that the accuracy of the final flow coefficient can be further improved by combining the correction based on the time difference and the correction based on the correction coefficient.

[0018] Furthermore, it also includes: generating a flow coefficient curve according to all second inlet and outlet pressure differences and the final flow coefficient corresponding to each second inlet and outlet pressure difference, wherein the horizontal axis of the flow coefficient curve is the second inlet and outlet pressure difference, and the vertical axis of the flow coefficient curve is the final flow coefficient.

[0019] The beneficial effect of adopting the above further solution is that it is convenient for users to intuitively view the corresponding relationship between the second inlet and outlet pressure difference and the final flow coefficient through the curve.

[0020] Further, the standard throttle hole is installed in the main test system, and the inlet and outlet pressure difference of the standard throttle hole is controlled by the main test system to change according to the first preset condition;

[0021] The control valve to be tested is installed in the main test system, and the opening of the control valve to be tested is controlled by the main test system to change according to the second preset condition.

[0022] Furthermore, the medium is softened water.

[0023] 2) In the second aspect, the present invention also provides a control valve flow coefficient acquisition system, and the specific technical solution is as follows:

[0024] It includes a correction coefficient determination module and a final flow coefficient calculation module;

[0025] The correction coefficient determination module is used to: control the inlet and outlet pressure difference of the standard throttle hole to change according to the first preset condition, collect the first inlet and outlet pressure difference of the standard throttle hole and the first flow corresponding to each first inlet and outlet pressure difference in real time and continuously, and calculate the flow coefficient corresponding to each first inlet and outlet pressure difference according to each first inlet and outlet pressure difference and the first flow corresponding to each first inlet and outlet pressure difference, and calculate the correction coefficient corresponding to each first inlet and outlet pressure difference based on the flow coefficient corresponding to each first inlet and outlet pressure difference and the standard flow coefficient corresponding to each first inlet and outlet pressure difference, wherein the first flow refers to: the flow of the medium flowing through the standard throttle hole;

[0026] The final flow coefficient calculation module is used to: control the opening of the tested regulating valve to change according to the second preset condition, collect the second inlet and outlet pressure differences of the tested regulating valve and the second flow corresponding to each second inlet and outlet pressure difference in real time and continuously, and calculate the flow coefficient corresponding to each second inlet and outlet pressure difference according to each second inlet and outlet pressure difference and the second flow corresponding to each second inlet and outlet pressure difference, and use the corresponding correction coefficient to correct it to obtain the final flow coefficient corresponding to each second inlet and outlet pressure difference, wherein the second flow refers to: the flow of the medium flowing through the tested regulating valve.

[0027] On the basis of the above scheme, the control valve flow coefficient acquisition system of the present invention can also be improved as follows.

[0028] Furthermore, it also includes a time difference determination module and a data translation module;

[0029] The time difference determination module is used to determine the time difference between a first moment and a second moment, the first moment refers to the moment when the control signal for controlling the opening of the measured regulating valve is issued, and the second moment refers to the moment when the measured regulating valve moves to the position corresponding to the control signal of the opening;

[0030] The data translation module is used to: before calculating the flow coefficient corresponding to each second inlet and outlet pressure difference, translate all the second flow rates according to the time difference to obtain a new second flow rate corresponding to each second inlet and outlet pressure difference;

[0031] The final flow coefficient calculation module is also specifically used to calculate the flow coefficient corresponding to each second inlet and outlet pressure difference according to each second inlet and outlet pressure difference and the new second flow corresponding to each second inlet and outlet pressure difference.

[0032] Furthermore, it also includes a curve generating module, which is used to generate a flow coefficient curve according to all second inlet and outlet pressure differences and the final flow coefficient corresponding to each second inlet and outlet pressure difference, wherein the horizontal axis of the flow coefficient curve is the second inlet and outlet pressure difference, and the vertical axis of the flow coefficient curve is the final flow coefficient.

[0033] Furthermore, the standard throttle orifice is installed in the main test system, and the correction coefficient determination module controls the inlet and outlet pressure difference of the standard throttle orifice through the main test system to change according to the first preset condition; the controlled valve to be tested is installed in the main test system, and the final flow coefficient calculation module controls the opening of the controlled valve to be tested through the main test system to change according to the second preset condition.

[0034] Furthermore, the medium is softened water.

[0035] 3) In a third aspect, the present invention further provides an electronic device, comprising a processor, the processor being coupled to a memory, the memory storing at least one computer program, the at least one computer program being loaded and executed by the processor so that the electronic device implements any of the above-mentioned methods for obtaining the flow coefficient of a regulating valve.

[0036] 4) In a fourth aspect, the present invention further provides a computer-readable storage medium, in which at least one computer program is stored, and the at least one computer program is loaded and executed by a processor so that a computer implements any of the above-mentioned methods for obtaining a flow coefficient of a regulating valve.

[0037] It should be noted that the beneficial effects achieved by the technical solutions of the second to fourth aspects of the present invention and the corresponding possible implementation methods can be found in the above-mentioned technical effects of the first aspect and its corresponding possible implementation methods, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0039] Figure 1 A schematic flow chart of a method for obtaining a flow coefficient of a regulating valve according to an embodiment of the present invention;

[0040] Figure 2 is a schematic structural diagram of a main test system according to an embodiment of the present invention;

[0041] Figure 3 It is a structural schematic diagram of a system for obtaining a flow coefficient of a regulating valve according to an embodiment of the present invention;

[0042] Figure 4 The figure is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0044] like Figure 1 As shown, a method for obtaining a flow coefficient of a regulating valve according to an embodiment of the present invention includes the following steps:

[0045] S1. Calculate the correction factor:

[0046] The inlet and outlet pressure difference of the standard throttle hole is controlled to change according to the first preset condition, the first inlet and outlet pressure difference of the standard throttle hole and the first flow corresponding to each first inlet and outlet pressure difference are collected in real time and continuously, and the flow coefficient corresponding to each first inlet and outlet pressure difference and each first inlet and outlet pressure difference are calculated according to each first inlet and outlet pressure difference and the first flow corresponding to each first inlet and outlet pressure difference, and the correction coefficient corresponding to each first inlet and outlet pressure difference is calculated based on the flow coefficient corresponding to each first inlet and outlet pressure difference and the standard flow coefficient corresponding to each first inlet and outlet pressure difference, wherein the first flow refers to: the flow of the medium flowing through the standard throttle hole;

[0047] Among them, the first preset condition is: to increase the inlet and outlet pressure difference (the pressure difference between the inlet and outlet) of the standard throttle hole from 0psid to 730psid at a rate of 0.01psid, and then reduce it to 0psid. The first preset condition can also be set according to actual conditions.

[0048] The flow coefficient corresponding to each first inlet and outlet pressure difference is calculated using the first formula, and the first formula is: Wherein, △P1 represents: any first inlet and outlet pressure difference, Q1 represents: the first flow rate corresponding to △P1, and Cv1 represents: the flow coefficient corresponding to △P1.

[0049] Among them, the flow coefficient corresponding to the inlet and outlet pressure difference of the standard throttle hole is accurately calibrated in advance as the standard flow coefficient, and then the flow coefficient corresponding to each first inlet and outlet pressure difference is compared with the standard flow coefficient corresponding to each first inlet and outlet pressure difference. Calculate the correction coefficient corresponding to each first inlet and outlet pressure difference, Cv 1,标准 Indicates: △P1 corresponds to the standard flow coefficient, δ1 indicates the correction coefficient corresponding to △P1.

[0050] S2. Calculate the final flow coefficient:

[0051] The opening of the tested regulating valve is controlled to change according to the second preset condition, and the second inlet and outlet pressure differences of the tested regulating valve and the second flow corresponding to each second inlet and outlet pressure difference are continuously collected in real time. According to each second inlet and outlet pressure difference and the second flow corresponding to each second inlet and outlet pressure difference, the flow coefficient corresponding to each second inlet and outlet pressure difference is calculated, and the corresponding correction coefficient is used to correct it to obtain the final flow coefficient corresponding to each second inlet and outlet pressure difference, wherein the second flow refers to: the flow of the medium flowing through the tested regulating valve.

[0052] The second preset condition is: the opening of the regulating valve to be tested is controlled to increase from 0% to 100% and then to 0% at an increase rate of 0.1%.

[0053] The flow coefficient corresponding to each second inlet and outlet pressure difference is calculated using the second formula, and the second formula is: Wherein, △P2 represents any second inlet and outlet pressure difference, Q2 represents the second flow rate corresponding to △P2, and Cv2 represents the flow coefficient corresponding to △P2.

[0054] Among them, the flow coefficient corresponding to each second inlet and outlet pressure difference is calculated, and the corresponding correction coefficient is used to correct it to obtain the final flow coefficient corresponding to each second inlet and outlet pressure difference. The specific implementation process is as follows:

[0055] The final flow coefficient corresponding to each second inlet and outlet pressure difference is calculated using the third formula. The third formula is: Cv 最终 =Cv2×δ2,Cv 最终 It represents the final flow coefficient corresponding to △P2, δ2 represents the correction coefficient corresponding to △P2. It should be noted that the correction coefficient corresponding to each first inlet and outlet pressure difference is fitted into: a curve of the correction coefficient with respect to the inlet and outlet pressure difference. The horizontal axis of the curve is the first inlet and outlet pressure difference, and the horizontal axis can be understood as the inlet and outlet pressure difference in a broad sense (that is, it can refer to any inlet and outlet pressure difference). The vertical axis is the correction coefficient. Through this curve, the correction coefficient corresponding to each second inlet and outlet pressure difference can be obtained.

[0056] In another embodiment, Cv can also be directly calculated by the fourth formula:最终 , the fourth formula is:

[0057] In this embodiment, the calculated flow coefficient of the measured regulating valve is corrected by the correction coefficient, which can improve the accuracy of the final flow coefficient. The present invention can effectively solve the technical problem that the Cv curve cannot be quickly and accurately measured and calculated during the maintenance or research and development of the fuel regulating valve of the gas turbine.

[0058] Optionally, in the above technical solution, it also includes:

[0059] Determine a time difference between a first moment and a second moment, the first moment being the moment when a control signal for controlling the opening of the measured regulating valve is issued, and the second moment being the moment when the measured regulating valve moves to a position corresponding to the opening of the control signal;

[0060] Before calculating the flow coefficient corresponding to each second inlet and outlet pressure difference, it also includes: according to the time difference, all the second flows are translated to obtain a new second flow corresponding to each second inlet and outlet pressure difference; then in S2, according to each second inlet and outlet pressure difference and the second flow corresponding to each second inlet and outlet pressure difference, the flow coefficient corresponding to each second inlet and outlet pressure difference is calculated, including:

[0061] According to each second inlet and outlet pressure difference and the new second flow rate corresponding to each second inlet and outlet pressure difference, the flow coefficient corresponding to each second inlet and outlet pressure difference is calculated. Combining the correction based on the time difference and the correction based on the correction coefficient, the accuracy of the final flow coefficient can be further improved.

[0062] For example, the time difference is 0.1 second, and the collection period is also 0.1 second. The translation can be understood as follows: in S2, the second inlet and outlet pressure differential of the measured regulating valve and the second flow corresponding to each second inlet and outlet pressure differential are collected every 0.1 second. Due to the existence of the time difference, all the second flows need to be shifted backward by 0.1 second as a whole. Specifically: the first second inlet and outlet pressure differential collected corresponds to the second second flow collected, the new second flow corresponding to the first second inlet and outlet pressure differential collected is the second second flow collected, the second second inlet and outlet pressure differential collected corresponds to the third second flow collected, the third second inlet and outlet pressure differential collected corresponds to the fourth second flow collected, and so on, to determine the new second flow corresponding to each second inlet and outlet pressure differential.

[0063] In another embodiment, with the second inlet and outlet pressure difference as the horizontal axis and the second flow rate as the vertical axis, a curve is generated for each collected second inlet and outlet pressure difference and the second flow rate corresponding to each second inlet and outlet pressure difference. The curve is translated based on the time difference. For example, if the time difference is 0.1 second and the collection period is 1 second, the curve is translated in the positive direction of the horizontal axis by 0.1 second. At this time, the flow rate corresponding to any second inlet and outlet pressure difference on the curve is the new second flow rate of the second inlet and outlet pressure difference. △P2 is replaced with the new second flow rate, and the final flow coefficient corresponding to each second inlet and outlet pressure difference is calculated by the second formula and the third formula, or the final flow coefficient corresponding to each second inlet and outlet pressure difference is calculated by the fourth formula.

[0064] Optionally, in the above technical solution, it also includes:

[0065] S3. Generate a flow coefficient curve according to all second inlet and outlet pressure differences and the final flow coefficient corresponding to each second inlet and outlet pressure difference, wherein the horizontal axis of the flow coefficient curve is the second inlet and outlet pressure difference, and the vertical axis of the flow coefficient curve is the final flow coefficient, so that the user can intuitively view the corresponding relationship between the second inlet and outlet pressure difference and the final flow coefficient through the curve.

[0066] Optionally, in the above technical solution, the standard throttle orifice is installed in the main test system, and the inlet and outlet pressure difference of the standard throttle orifice is controlled by the main test system to change according to the first preset condition;

[0067] The control valve to be tested is installed in the main test system, and the opening of the control valve to be tested is controlled by the main test system to change according to the second preset condition.

[0068] Optionally, in the above technical solution, the medium is softened water.

[0069] like Figure 2 As shown, the main test system includes a pressure flow detection subsystem and a temperature control subsystem, specifically:

[0070] 1) Pressure and flow detection subsystem:

[0071] The water tank of the pressure flow detection subsystem is filled with softened water. The first water pump B1 is used to pressurize the softened water in the water tank to the required pressure and transport the softened water to the first filter G1. The first filter G1 is used to filter out impurities in the softened water and send the filtered softened water through the first pressure regulating valve F1 to the measured regulating valve or standard throttle hole. The first pressure regulating valve F1 is used to: adjust the water inlet pressure to the set pressure, the first temperature sensor T1 measures the water inlet temperature, the first differential pressure gauge P1 measures the inlet and outlet pressure difference of the measured regulating valve and the inlet and outlet pressure difference of the standard throttle hole, PV1 represents the measured regulating valve or the standard throttle hole, the back pressure valve F2 adjusts the outlet back pressure, and the flow meter L1 is used to measure the flow through the measured regulating valve and the standard throttle hole.

[0072] By issuing instructions to the pressure flow detection subsystem, the inlet and outlet pressure differential of the standard throttle hole is controlled to change according to the first preset condition, and the first inlet and outlet pressure differential of the standard throttle hole and the first flow corresponding to each first inlet and outlet pressure differential are continuously collected in real time. The opening of the measured regulating valve is controlled to change according to the second preset condition, and the second inlet and outlet pressure differential of the measured regulating valve and the second flow corresponding to each second inlet and outlet pressure differential are continuously collected in real time.

[0073] 2) Temperature control subsystem:

[0074] The second water pump B2 on the cooling pipeline of the temperature control subsystem increases the softened water to the required pressure, and adjusts the water inlet pressure through the second pressure regulating valve F3, filters out impurities in the softened water through the second filter G2, and adjusts the water inlet flow through the flow regulating valve F4. The second temperature sensor T2 is used to: measure the water inlet temperature of the softened water, the second pressure gauge P2 measures the water inlet pressure of the softened water, the heat exchanger R1 is used to adjust the temperature of the softened water in the water tank, and the softened water output by the heat exchanger R1 enters the water tank of the pressure and flow detection subsystem, so that the temperature of the softened water in the water tank is maintained within the range of 20±1℃.

[0075] In another embodiment, comprising:

[0076] 1) Install the standard orifice (the flow coefficient corresponding to the inlet and outlet pressure difference of the standard orifice is accurately calibrated in advance) into the main test system.

[0077] 2) Turn on the power of the main test system and start the first water pump B1 and the second water pump B2.

[0078] 3) Adjust the water inlet pressure of the first pressure regulating valve F1 so that the inlet and outlet pressure difference of the standard throttle orifice increases from 0 psid to 730 psid at a rate of 0.01 psid and then decreases to 0 psid.

[0079] 4) Real-time and continuous collection of the first inlet and outlet pressure difference of the standard throttle hole, the first flow rate corresponding to each first inlet and outlet pressure difference, and the softened water temperature.

[0080] 5) According to each first inlet and outlet pressure difference and the first flow corresponding to each first inlet and outlet pressure difference, the flow coefficient corresponding to each first inlet and outlet pressure difference is calculated; based on the flow coefficient corresponding to each first inlet and outlet pressure difference and the standard flow coefficient corresponding to each first inlet and outlet pressure difference, the correction coefficient corresponding to each first inlet and outlet pressure difference is calculated.

[0081] 6) Reduce the water inlet pressure and remove the standard throttle hole.

[0082] 7) Install the repaired or newly assembled control valve, i.e. the control valve to be tested, into the main test system.

[0083] 8) Start the first water pump B1 and the second water pump B2.

[0084] 9) Adjust the water inlet pressure of the first pressure regulating valve F1, and control the opening of the tested regulating valve from 0% to 100% and then to 0% at an increase rate of 0.1%.

[0085] 10) Real-time and continuous collection of the second inlet and outlet pressure difference of the tested regulating valve and the second flow rate corresponding to each second inlet and outlet pressure difference, as well as the issuance time of each control signal for controlling the opening of the tested regulating valve and the softened water temperature.

[0086] 11) Determine the time difference between a first moment and a second moment, the first moment refers to the moment when a control signal for controlling the opening of the control valve under test is issued, and the second moment refers to the moment when the control valve under test moves to a position corresponding to the opening of the control signal.

[0087] 12) According to the time difference, all the second flow rates are translated to obtain a new second flow rate corresponding to each second inlet and outlet pressure difference, and the flow coefficient corresponding to each second inlet and outlet pressure difference is calculated based on each second inlet and outlet pressure difference and the new second flow rate corresponding to each second inlet and outlet pressure difference. The corresponding correction coefficient is used to correct the flow coefficient to obtain the final flow coefficient corresponding to each second inlet and outlet pressure difference.

[0088] 13) Generate a flow coefficient curve based on all second inlet and outlet pressure differences and the final flow coefficient corresponding to each second inlet and outlet pressure difference and display or output it, wherein the horizontal axis of the flow coefficient curve is the second inlet and outlet pressure difference and the vertical axis of the flow coefficient curve is the final flow coefficient.

[0089] 14) Reduce the pressure to zero, turn off the power supply, and remove the regulating valve under test.

[0090] Among them, the regulating valve under test can be a fuel regulating valve, specifically a fuel regulating valve for gas turbines used in large ships, a fuel regulating valve for gas turbines used in oil and natural gas transportation, a fuel regulating valve for gas turbines used in natural gas and coke oven gas power generation, a fuel regulating valve for the maintenance of gas turbine fuel regulating valves for offshore oil production platforms, or a fuel regulating valve for other purposes.

[0091] The test and calculation methods in the present invention are reasonable, the calculations are rapid and accurate, and the use is convenient and safe. Combined with the correction based on the time difference and the correction based on the correction coefficient, the accuracy of the final flow coefficient can be improved. The present invention can effectively solve the technical problem that the Cv curve cannot be quickly and accurately measured and calculated during the maintenance process or the research and development process of the fuel regulating valve of the gas turbine, and has obvious economic benefits.

[0092] In the above embodiments, although the steps are numbered S1, S2, etc., these are only specific embodiments given by the present invention. Those skilled in the art may adjust the execution order of S1, S2, etc. according to actual conditions, which is also within the protection scope of the present invention. It can be understood that in some embodiments, some or all of the above embodiments may be included.

[0093] like Figure 3 As shown, a control valve flow coefficient acquisition system 200 according to an embodiment of the present invention includes a correction coefficient determination module 201 and a final flow coefficient calculation module 202;

[0094] The correction coefficient determination module 201 is used to: control the inlet and outlet pressure difference of the standard throttle hole to change according to the first preset condition, collect the first inlet and outlet pressure difference of the standard throttle hole and the first flow corresponding to each first inlet and outlet pressure difference in real time and continuously, and calculate the flow coefficient corresponding to each first inlet and outlet pressure difference according to each first inlet and outlet pressure difference and the first flow corresponding to each first inlet and outlet pressure difference, and calculate the correction coefficient corresponding to each first inlet and outlet pressure difference based on the flow coefficient corresponding to each first inlet and outlet pressure difference and the standard flow coefficient corresponding to each first inlet and outlet pressure difference, wherein the first flow refers to: the flow of the medium flowing through the standard throttle hole;

[0095] The final flow coefficient calculation module 202 is used to: control the opening of the tested regulating valve to change according to the second preset condition, collect the second inlet and outlet pressure differences of the tested regulating valve and the second flow corresponding to each second inlet and outlet pressure difference in real time and continuously, and calculate the flow coefficient corresponding to each second inlet and outlet pressure difference according to each second inlet and outlet pressure difference and the second flow corresponding to each second inlet and outlet pressure difference, and use the corresponding correction coefficient to correct it to obtain the final flow coefficient corresponding to each second inlet and outlet pressure difference, wherein the second flow refers to: the flow of the medium flowing through the tested regulating valve.

[0096] Optionally, in the above technical solution, a time difference determination module and a data translation module are also included;

[0097] The time difference determination module is used to determine the time difference between a first moment and a second moment, wherein the first moment refers to the moment when a control signal for controlling the opening of the measured regulating valve is issued, and the second moment refers to the moment when the measured regulating valve moves to a position corresponding to the opening control signal;

[0098] The data translation module is used to: before calculating the flow coefficient corresponding to each second inlet and outlet pressure difference, translate all the second flow rates according to the time difference to obtain a new second flow rate corresponding to each second inlet and outlet pressure difference;

[0099] The final flow coefficient calculation module is also specifically used to calculate the flow coefficient corresponding to each second inlet and outlet pressure difference according to each second inlet and outlet pressure difference and the new second flow corresponding to each second inlet and outlet pressure difference.

[0100] Optionally, the above technical solution also includes a curve generation module, which is used to generate a flow coefficient curve based on all second inlet and outlet pressure differences and the final flow coefficient corresponding to each second inlet and outlet pressure difference, wherein the horizontal axis of the flow coefficient curve is the second inlet and outlet pressure difference, and the vertical axis of the flow coefficient curve is the final flow coefficient.

[0101] Optionally, in the above technical solution, the standard throttle hole is installed in the main test system, and the correction coefficient determination module 201 controls the inlet and outlet pressure difference of the standard throttle hole through the main test system to change according to the first preset condition; the controlled valve to be tested is installed in the main test system, and the final flow coefficient calculation module 202 controls the opening of the controlled valve to be tested through the main test system to change according to the second preset condition.

[0102] Optionally, in the above technical solution, the medium is softened water.

[0103] In another embodiment, a control valve flow coefficient acquisition system according to an embodiment of the present invention includes: a main test system, a control valve control system and a data acquisition calculation correction system, and the specific working process is as follows:

[0104] 1) Install the standard orifice (the flow coefficient corresponding to the inlet and outlet pressure difference of the standard orifice is accurately calibrated in advance) into the main test system.

[0105] 2) Turn on the power of the main test system, start the first water pump B1 and the second water pump B2, integrate the regulating valve control system and the data acquisition calculation correction system into an electronic device such as a computer, and turn on the power of the device.

[0106] 3) The regulating valve control system adjusts the water inlet pressure of the first pressure regulating valve F1 so that the inlet and outlet pressure difference of the standard throttle orifice increases from 0 psid to 730 psid at a rate of 0.01 psid and then decreases to 0 psid.

[0107] 4) The data acquisition, calculation and correction system continuously and in real time acquires the first inlet and outlet pressure difference of the standard throttle hole and the first flow rate corresponding to each first inlet and outlet pressure difference, as well as the softened water temperature.

[0108] 5) The data acquisition, calculation and correction system calculates the flow coefficient corresponding to each first inlet and outlet pressure differential according to each first inlet and outlet pressure differential and the first flow corresponding to each first inlet and outlet pressure differential, and calculates the correction coefficient corresponding to each first inlet and outlet pressure differential based on the flow coefficient corresponding to each first inlet and outlet pressure differential and the standard flow coefficient corresponding to each first inlet and outlet pressure differential.

[0109] 6) The regulating valve control system reduces the water inlet pressure and removes the standard throttle hole.

[0110] 7) Install the repaired or newly assembled control valve, i.e. the control valve to be tested, into the main test system.

[0111] 8) Start the first water pump B1 and the second water pump B2.

[0112] 9) The regulating valve control system adjusts the water inlet pressure of the first pressure regulating valve F1, and controls the opening of the measured regulating valve from 0% to 100% and then to 0% at an increase rate of 0.1%.

[0113] 10) The data acquisition, calculation and correction system continuously collects the second inlet and outlet pressure difference of the measured regulating valve and the second flow corresponding to each second inlet and outlet pressure difference, as well as the issuance time of each control signal for controlling the opening of the measured regulating valve and the softened water temperature in real time.

[0114] 11) The data acquisition calculation correction system determines the time difference between the first moment and the second moment. The first moment refers to the moment when the control signal for controlling the opening of the measured regulating valve is issued, and the second moment refers to the moment when the measured regulating valve moves to the position corresponding to the opening control signal.

[0115] 12) The data acquisition calculation correction system translates all the second flow rates according to the time difference to obtain a new second flow rate corresponding to each second inlet and outlet pressure difference, and calculates the flow coefficient corresponding to each second inlet and outlet pressure difference according to each second inlet and outlet pressure difference and the new second flow rate corresponding to each second inlet and outlet pressure difference. The corresponding correction coefficient is used for correction to obtain the final flow coefficient corresponding to each second inlet and outlet pressure difference.

[0116] 13) The data acquisition calculation correction system generates and displays or outputs a flow coefficient curve based on all second inlet and outlet pressure differentials and the final flow coefficient corresponding to each second inlet and outlet pressure differential. The horizontal axis of the flow coefficient curve is the second inlet and outlet pressure differential, and the vertical axis of the flow coefficient curve is the final flow coefficient.

[0117] 14) Reduce the pressure to zero, turn off the power supply, and remove the regulating valve under test.

[0118] It should be noted that the beneficial effects of the control valve flow coefficient acquisition system 200 provided in the above embodiment are the same as the beneficial effects of the control valve flow coefficient acquisition method described above, which will not be described in detail here. In addition, when the system provided in the above embodiment realizes its functions, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the system can be divided into different functional modules according to actual conditions to complete all or part of the functions described above. In addition, the system and method embodiments provided in the above embodiment belong to the same concept, and the specific implementation process is detailed in the method embodiment, which will not be described in detail here.

[0119] like Figure 4 As shown, an electronic device 300 according to an embodiment of the present invention includes a processor 320, the processor 320 is coupled to a memory 310, and the memory 310 stores at least one computer program 330, and the at least one computer program 330 is loaded and executed by the processor 320, so that the electronic device 300 implements any of the above-mentioned methods for obtaining a flow coefficient of a regulating valve, specifically:

[0120] The electronic device 300 may have relatively large differences due to different configurations or performances, and may include one or more processors 320 (Central Processing Units, CPU) and one or more memories 310, wherein the one or more memories 310 store at least one computer program 330, and the at least one computer program 330 is loaded and executed by the one or more processors 320, so that the electronic device 300 implements any of the methods for obtaining the flow coefficient of the regulating valve provided in the above embodiments. Of course, the electronic device 300 may also have components such as a wired or wireless network interface, a keyboard, and an input and output interface for input and output. The electronic device 300 may also include other components for realizing the functions of the device, which will not be described in detail here. The electronic device may specifically be a computer, etc.

[0121] A computer-readable storage medium according to an embodiment of the present invention stores at least one computer program, and the at least one computer program is loaded and executed by a processor so that a computer implements any of the above-mentioned methods for obtaining a flow coefficient of a regulating valve.

[0122] Optionally, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, and the like.

[0123] In an exemplary embodiment, a computer program product or a computer program is also provided, the computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the electronic device executes any of the above-mentioned methods for obtaining a flow coefficient of a regulating valve.

[0124] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects and represent the definition of a specific order or sequence. The order of use of similar objects can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than the order shown or described.

[0125] Those skilled in the art know that the present invention can be implemented as a system, method or computer program product. Therefore, the present invention can be specifically implemented in the following forms, namely: it can be complete hardware, it can be complete software (including firmware, resident software, microcode, etc.), or it can be a combination of hardware and software, which is generally referred to as "circuit", "module" or "system" herein. In addition, in some embodiments, the present invention can also be implemented in the form of a computer program product in one or more computer-readable media, and the computer-readable medium contains computer-readable program code.

[0126] Any combination of one or more computer-readable media can be used. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present invention, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0127] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for obtaining a flow coefficient of a regulating valve, characterized in that: include: The inlet and outlet pressure difference of the standard throttle hole is controlled to change according to the first preset condition, the first inlet and outlet pressure difference of the standard throttle hole and the first flow corresponding to each first inlet and outlet pressure difference are collected in real time and continuously, and the flow coefficient corresponding to each first inlet and outlet pressure difference and each first inlet and outlet pressure difference are calculated according to each first inlet and outlet pressure difference and the first flow corresponding to each first inlet and outlet pressure difference, and the correction coefficient corresponding to each first inlet and outlet pressure difference is calculated based on the flow coefficient corresponding to each first inlet and outlet pressure difference and the standard flow coefficient corresponding to each first inlet and outlet pressure difference, wherein the first flow refers to: the flow of the medium flowing through the standard throttle hole; The opening of the tested regulating valve is controlled to change according to the second preset condition, and the second inlet and outlet pressure differences of the tested regulating valve and the second flow corresponding to each second inlet and outlet pressure difference are continuously collected in real time. According to each second inlet and outlet pressure difference and the second flow corresponding to each second inlet and outlet pressure difference, the flow coefficient corresponding to each second inlet and outlet pressure difference is calculated, and the corresponding correction coefficient is used to correct it to obtain the final flow coefficient corresponding to each second inlet and outlet pressure difference, wherein the second flow refers to: the flow of the medium flowing through the tested regulating valve.

2. A method for obtaining a flow coefficient of a regulating valve according to claim 1, characterized in that: Also includes: Determine a time difference between a first moment and a second moment, wherein the first moment refers to the moment when a control signal for controlling the opening of the measured regulating valve is issued, and the second moment refers to the moment when the measured regulating valve moves to a position corresponding to the opening of the control signal; Before calculating the flow coefficient corresponding to each second inlet and outlet pressure difference, it also includes: According to the time difference, all second flow rates are translated to obtain a new second flow rate corresponding to each second inlet and outlet pressure difference; According to each second inlet and outlet pressure difference and the second flow rate corresponding to each second inlet and outlet pressure difference, the flow coefficient corresponding to each second inlet and outlet pressure difference is calculated, including: According to each second inlet and outlet pressure difference and the new second flow rate corresponding to each second inlet and outlet pressure difference, the flow coefficient corresponding to each second inlet and outlet pressure difference is calculated.

3. A method for obtaining a flow coefficient of a regulating valve according to claim 2, characterized in that: Also includes: A flow coefficient curve is generated according to all the second inlet and outlet pressure differences and the final flow coefficient corresponding to each second inlet and outlet pressure difference, wherein the horizontal axis of the flow coefficient curve is the second inlet and outlet pressure difference and the vertical axis of the flow coefficient curve is the final flow coefficient.

4. A method for obtaining a flow coefficient of a regulating valve according to any one of claims 1 to 3, characterized in that: The standard throttle orifice is installed in a main test system, and the inlet and outlet pressure difference of the standard throttle orifice is controlled by the main test system to change according to a first preset condition; The control valve under test is installed in the main test system, and the main test system is used to control the opening of the control valve under test to change according to a second preset condition.

5. A method for obtaining a flow coefficient of a regulating valve according to any one of claims 1 to 3, characterized in that: The medium is softened water.

6. A control valve flow coefficient acquisition system, characterized in that: It includes a correction coefficient determination module and a final flow coefficient calculation module; The correction coefficient determination module is used to: control the inlet and outlet pressure difference of the standard throttle hole to change according to the first preset condition, collect the first inlet and outlet pressure difference of the standard throttle hole and the first flow corresponding to each first inlet and outlet pressure difference in real time and continuously, and calculate the flow coefficient corresponding to each first inlet and outlet pressure difference according to each first inlet and outlet pressure difference and the first flow corresponding to each first inlet and outlet pressure difference, and calculate the correction coefficient corresponding to each first inlet and outlet pressure difference based on the flow coefficient corresponding to each first inlet and outlet pressure difference and the standard flow coefficient corresponding to each first inlet and outlet pressure difference, wherein the first flow refers to: the flow of the medium flowing through the standard throttle hole; The final flow coefficient calculation module is used to: control the opening of the tested regulating valve to change according to the second preset condition, collect the second inlet and outlet pressure differences of the tested regulating valve and the second flow corresponding to each second inlet and outlet pressure difference in real time and continuously, and calculate the flow coefficient corresponding to each second inlet and outlet pressure difference according to each second inlet and outlet pressure difference and the second flow corresponding to each second inlet and outlet pressure difference, and use the corresponding correction coefficient to correct it to obtain the final flow coefficient corresponding to each second inlet and outlet pressure difference, wherein the second flow refers to: the flow of the medium flowing through the tested regulating valve.

7. A control valve flow coefficient acquisition system according to claim 6, characterized in that: It also includes a time difference determination module and a data translation module; The time difference determination module is used to determine the time difference between a first moment and a second moment, wherein the first moment refers to the moment when a control signal for controlling the opening of the measured regulating valve is issued, and the second moment refers to the moment when the measured regulating valve moves to a position corresponding to the opening control signal; The data translation module is used to: before calculating the flow coefficient corresponding to each second inlet and outlet pressure difference, translate all the second flow rates according to the time difference to obtain a new second flow rate corresponding to each second inlet and outlet pressure difference; The final flow coefficient calculation module is also specifically used to calculate the flow coefficient corresponding to each second inlet and outlet pressure difference according to each second inlet and outlet pressure difference and the new second flow corresponding to each second inlet and outlet pressure difference.

8. A control valve flow coefficient acquisition system according to claim 7, characterized in that: It also includes a curve generating module, which is used to generate a flow coefficient curve according to all second inlet and outlet pressure differences and the final flow coefficient corresponding to each second inlet and outlet pressure difference, wherein the horizontal axis of the flow coefficient curve is the second inlet and outlet pressure difference, and the vertical axis of the flow coefficient curve is the final flow coefficient.

9. A regulating valve flow coefficient acquisition system according to any one of claims 6 to 8, characterized in that: The standard throttle orifice is installed in the main test system, and the correction coefficient determination module controls the inlet and outlet pressure difference of the standard throttle orifice through the main test system to change according to the first preset condition; the tested regulating valve is installed in the main test system, and the final flow coefficient calculation module controls the opening of the tested regulating valve through the main test system to change according to the second preset condition.

10. A control valve flow coefficient acquisition system according to any one of claims 6 to 8, characterized in that: The medium is softened water.

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