A method and system for testing the response of a water-cooled premix burner valve train

Abstract

This invention belongs to the field of valve testing technology, specifically relating to a method and system for testing the response of a water-cooled premixed burner valve assembly. The method includes: dividing the gas storage space in a series-connected gas valve assembly into gas control volumes; forming a transient gas inventory based on the absolute pressure, absolute temperature, and effective volume of each gas control volume; and obtaining the actual cross-valve mass flow rate of the target valve by combining the mass flow rate at the end of the valve assembly; forming a gas flow driving force term based on the gas state on both sides of the target valve; obtaining the local effective flow parameters of the target valve; determining the local response of the target valve and the gas supply response at the end of the valve assembly; and forming an additional downstream gas path response of the target valve by combining the corresponding response time difference and the cumulative gas inventory change downstream of the target valve. This invention can distinguish between the flow response of the target valve and the gas supply response at the end of the valve assembly, and determine whether the lag in the end response is accompanied by the filling or releasing of gas in the downstream gas storage space, thus improving the accuracy and interpretability of the response test results.

Description

Technical Field

[0001] This invention relates to the field of valve testing technology. More specifically, this invention relates to a method and system for testing the response of a water-cooled premixed burner valve assembly. Background Technology

[0002] During start-up, shutdown, load switching, and safety interlocking, water-cooled premixed burners require changes in the gas supply state via gas valve assemblies. These valve assemblies consist of multiple valves connected in series along the gas flow direction, with pipelines, joints, and connecting chambers between them. To determine whether the valve assembly's actions meet control requirements, it is necessary to test the response process of the target valve and the valve assembly's end, and record the changes in pressure, temperature, and mass flow rate after the action command is issued.

[0003] Existing testing methods typically rely on the mass flow rate at the valve assembly's end, the end pressure, or the pressure at adjacent locations as the primary basis. By detecting when these parameters begin to change or reach a predetermined proportion, the response time of the valve or valve assembly is determined. Some tests also incorporate upstream and downstream pressure conditions to convert the flow rate, in order to reduce the impact of changes in gas supply conditions.

[0004] However, in a series gas valve assembly, after the target valve actuates, the flow change at the target valve's location is also affected by changes in the gas state in the downstream pipeline, joints, and connecting chambers when it reaches the end of the valve assembly. This causes the actual flow response at the target valve's location to be not completely synchronized with the gas supply response reflected by the mass flow rate or pressure at the end of the valve assembly. Existing testing methods mainly determine the response time based on the valve assembly end parameters or pressure at adjacent locations. This makes it difficult to distinguish between the flow change of the target valve itself and the response difference caused by the downstream gas path. It is easy to directly attribute the lag in the valve assembly end response to the target valve's own slow response, leading to a bias in the judgment of the target valve's actual response performance. Summary of the Invention

[0005] To address the technical problem of accurately distinguishing the response of the target valve itself from the gas supply response at the end of the valve group in the aforementioned series gas valve group, the present invention provides solutions in the following aspects.

[0006] In a first aspect, the present invention provides a method for testing the response of a water-cooled premixed burner valve assembly, comprising: The gas storage space between adjacent valves in the series gas valve group and between the downstream valve and the mass flow detection position at the end of the valve group are divided into gas control volumes, and there are no other open gas branches between the target valve and the mass flow detection position at the end of the valve group. The transient gas inventory of each gas control volume is formed based on the absolute pressure, absolute temperature, and effective volume of each gas control volume over time. The transient gas inventory of each gas control volume downstream of the target valve is added together to form the cumulative gas inventory downstream of the target valve. The actual cross-valve mass flow rate of the target valve is obtained by adding the mass flow rate at the end of the valve group with the first-order rate of change of the cumulative gas inventory downstream of the target valve over time. Based on the upstream absolute pressure, upstream absolute temperature and downstream absolute pressure of the target valve, a gas flow driving force term is formed according to the compressible gas flow relationship, and the ratio of the actual cross-valve mass flow rate of the target valve to the gas flow driving force term is used as the local effective flow parameter of the target valve. The local response of the target valve and the gas supply response at the end of the valve group are determined based on the local effective flow parameters of the target valve and the mass flow rate at the end of the valve group, respectively. The additional response of the downstream gas path of the target valve is formed based on the difference between the corresponding response times and the change in the cumulative gas inventory downstream of the target valve during the corresponding time period.

[0007] Preferably, the gas storage space between adjacent valves in the series gas valve group and between the downstream valve and the mass flow detection position at the end of the valve group are respectively divided into gas control volumes, including: Using the flow control cross-section of each valve in series as the boundary between adjacent gas control volumes, the first... Downstream of the flow control section of the valve to the first The space for storing test gas between the upstream side of the flow control section of each valve is divided into the first... The gas control volume is defined as the space between the downstream side of the flow control section of the downstream valve and the mass flow detection position at the end of the valve assembly that can store test gas. Among them, the valve cavity inside the valve body located downstream of the flow control section and connected to the downstream pipeline is included in the corresponding gas control volume.

[0008] Preferably, the transient gas inventory satisfies the following expression: ; In the formula, Number the gas control volume; For the first The gas control volume at time Transient gas inventory; For the first The gas control volume at time Absolute pressure; For the first The effective volume of the gas control volume; For the first The test gas in the gas control volume at time... The compressibility factor corresponding to the gas state; This is the specific gas constant of the gas currently being tested; For the first The gas control volume at time The absolute temperature.

[0009] Preferably, the step of forming a gas flow driving force term according to the compressible gas flow relationship includes: The ratio of the absolute pressure downstream of the target valve to the absolute pressure upstream of the target valve is used as the pressure ratio. The critical pressure ratio is determined based on the specific heat ratio of the test gas. When the pressure ratio is greater than the critical pressure ratio but less than 1, the gas flow driving force term is formed according to the compressible gas flow relationship corresponding to the non-critical flow state. When the pressure ratio is greater than 0 but not greater than the critical pressure ratio, the gas flow driving force term is formed according to the compressible gas flow relationship corresponding to the critical flow state.

[0010] Preferably, when the pressure ratio is greater than the critical pressure ratio and less than 1, the gas flow driving force term satisfies the expression: ; When the pressure ratio is greater than 0 and not greater than the critical pressure ratio, the gas flow driving force term satisfies the following expression: ; In the formula, For the first The target valve at time The driving force term for gas flow; The absolute pressure upstream of the target valve; The absolute temperature upstream of the target valve; Pressure ratio; This is the specific gas constant of the gas currently being tested; This represents the specific heat ratio of the gas currently being tested.

[0011] Preferably, determining the local response of the target valve and the gas supply response at the end of the valve assembly based on the local effective flow parameters of the target valve and the mass flow rate at the end of the valve assembly, respectively, includes: The arithmetic mean of the local effective flow parameters of the target valve within the effective stable interval before action is taken to form the local effective flow reference before the target valve action; the arithmetic mean of the mass flow rate at the end of the valve group within the effective stable interval before action is taken to form the gas supply reference at the end of the valve group before action; the arithmetic mean of the local effective flow parameters of the target valve within the target state reference interval is taken to form the target state reference reference of the target valve; the arithmetic mean of the mass flow rate at the end of the valve group within the target state reference interval is taken to form the target state reference reference at the end of the valve group. Based on the local effective flow reference before the target valve operates and the target valve target state reference, the local effective flow parameters of the target valve at each sampling time are linearly normalized to obtain the local effective flow normalized response value, and the local effective flow response trajectory of the target valve is constructed according to the sampling time sequence. Based on the gas supply reference before the valve group's end action and the valve group's end target state reference, the mass flow rate of the valve group's end at each sampling time is linearly normalized to obtain the normalized gas supply response value of the valve group's end, and the effective gas supply response trajectory of the valve group's end is constructed according to the sampling time sequence.

[0012] Preferably, it further includes: Set the start response judgment ratio and the completion response judgment ratio. Starting from the moment the target valve is activated, determine the moment when the local effective flow response trajectory of the target valve first reaches the start response judgment ratio and the completion response judgment ratio, and determine the moment when the target valve is locally activated and the moment when the target valve is locally completed. Starting from the moment the target valve is activated, determine the moment when the effective gas supply response trajectory at the end of the valve group first reaches the start response judgment ratio and the completion response judgment ratio, and determine the moment when the valve group is completed.

[0013] Preferably, it further includes: Starting from the moment of the target valve's action command, the cutoff moment corresponding to the maximum allowable response time of the target valve is determined based on the maximum allowable response time of the target valve. When the moment when the target valve partially completes its response is not later than the cutoff moment corresponding to the maximum allowable response time of the target valve, the result of the local response test of the target valve is qualified. When the moment when the target valve partially completes its response is later than the cutoff moment corresponding to the maximum allowable response time of the target valve, or when the effective flow response trajectory of the target valve in the local area has not reached the completion response judgment ratio before the cutoff moment corresponding to the maximum allowable response time of the target valve, the result of the local response test of the target valve is unqualified. Starting from the moment of the target valve's action command, the cutoff time corresponding to the maximum allowable response time at the end of the valve group is determined based on the maximum allowable response time at the end of the valve group. When the completion time of the valve group's response is not later than the cutoff time corresponding to the maximum allowable response time at the end of the valve group, the gas supply response test result at the end of the valve group is qualified. When the completion time of the valve group's response is later than the cutoff time corresponding to the maximum allowable response time at the end of the valve group, or when the effective gas supply response trajectory at the end of the valve group has not reached the completion response judgment ratio before the cutoff time corresponding to the maximum allowable response time at the end of the valve group, the gas supply response test result at the end of the valve group is unqualified.

[0014] Preferably, the step of forming an additional downstream gas path response for the target valve based on the difference between the corresponding response times and the change in the cumulative gas inventory downstream of the target valve during the corresponding time period includes: The start response time difference is formed by the start response time of the valve group end and the start response time of the target valve part. The completion response time difference is formed by the completion response time of the valve group end and the completion response time of the target valve part. The cumulative gas inventory change of the target valve downstream in the two corresponding response periods is determined respectively. The additional response of the downstream gas path of the target valve is formed by the start response time difference, the completion response time difference and the corresponding cumulative gas inventory change of the target valve downstream.

[0015] Secondly, the present invention provides a water-cooled premixed burner valve group response testing system, including a processor and a memory, wherein the memory stores computer program instructions, and when the computer program instructions are executed by the processor, the above-mentioned water-cooled premixed burner valve group response testing method is implemented.

[0016] By adopting the above technical solution, a computer program is generated from the above-mentioned water-cooled premixed burner valve group response test method and stored in the memory so that it can be loaded and executed by the processor. In this way, a terminal device can be made based on the memory and the processor for convenient use.

[0017] The beneficial effects of this invention are as follows: This invention treats the downstream gas storage space of the target valve as a gas control volume, and combines the gas volume changes of each gas control volume with the mass flow rate at the end of the valve group to restore the actual cross-valve mass flow rate of the target valve. Then, based on the gas state on both sides of the target valve, it forms the local effective flow parameters of the target valve, so that the local flow changes of the target valve itself are no longer directly affected by the downstream gas storage process and transient gas state changes. On this basis, the local response of the target valve and the gas supply response at the end of the valve group are formed respectively, and the additional gas path response downstream of the target valve is formed by combining the time difference between the two responses and the cumulative gas volume changes downstream of the target valve. This allows the test results to determine whether the flow response of the target valve itself meets the requirements, as well as whether the actual gas supply response at the end of the valve group meets the requirements. Furthermore, it can identify whether the lag in the response at the end of the valve group is accompanied by the filling or releasing process of the downstream gas storage space of the target valve, thereby improving the accuracy and interpretability of the test results of the series gas valve group response. Attached Figure Description

[0018] Figure 1 This is a flowchart of a water-cooled premixed burner valve group response test method according to the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0021] This invention discloses a method for testing the response of a water-cooled premixed burner valve assembly, referring to... Figure 1 This includes steps S1-S6: S1. Divide the gas storage space in the series gas valve group into gas control volumes, and ensure that there are no other open gas branches between the target valve and the mass flow detection position at the end of the valve group.

[0022] Connect the gas valve assembly to be tested to the valve assembly response test gas path, and sequentially determine the first to the second valves participating in the current test along the normal gas flow direction. There are 10 valves, and one valve to be tested is selected as the current target valve, denoted as the 1st valve. Each valve. One response test corresponds to one opening or one closing action of the target valve, with the normal flow direction of the gas also serving as the positive direction of the subsequent mass flow rate.

[0023] When testing the flow response of the target valve itself, the series valves other than the target valve remain fully open and their positions remain unchanged during the target valve response test.

[0024] After the target valve is activated, the test gas passing through the target valve will not immediately reach the end of the gas valve assembly. This is because there are actual spaces in the pipelines, joints, and valve chambers connected to the gas path between adjacent valves that can store compressible gas. When the mass flow rate flowing into these spaces is not equal to the mass flow rate flowing out of these spaces, the gas mass increases or decreases over time. If only the mass flow rate at the end of the gas valve assembly is observed, the gas accumulating or being released in the gas path between valves will, together with the flow change of the target valve itself, manifest as a change in the end flow rate. Therefore, the actual gas storage space between valves needs to be treated as a gas control volume with its own gas mass state.

[0025] Specifically, the flow control section of each valve in series, where the actual controlled gas flow passes, serves as the boundary between adjacent gas control volumes. The flow control section is the throttling section formed between the valve core, valve plate, or other opening / closing element and the valve body flow channel; its effective flow area changes with valve operation and directly limits the gas flow. For the first... The valve to the first The valve will... Downstream of the flow control section of the valve to the first The space for storing test gas between the upstream side of the flow control section of each valve is divided into the first... Gas control volume ,in, ; will the first The space for storing test gas between the downstream side of the flow control section of each valve and the mass flow detection position at the end of the valve assembly is divided into the following sections: Gas control volume The valve cavity located downstream of the flow control section and connected to the downstream pipeline is included in the corresponding downstream gas control volume. The valve cavity located upstream of the flow control section is not included in the corresponding downstream gas control volume.

[0026] Determine the effective volume corresponding to each gas control volume. The effective volume represents the space within the corresponding gas control volume that is actually occupied by the test gas and participates in transient gas storage. In one embodiment, the internal volume of each component space is determined based on the inner diameter of the pipe, the length of the pipe, the internal dimensions of the connector, and the internal dimensions of the valve cavity located within the corresponding mass boundary of the corresponding gas control volume, and the internal volumes of each component space are added together to obtain the effective volume of the corresponding gas control volume.

[0027] In another embodiment, the effective volume of the gas control volume is obtained through volume calibration. That is, the gas control volume to be calibrated is sealed, and the absolute pressure and absolute temperature of the test gas in it are recorded before calibration. A known mass of the same test gas is added to the gas control volume, and the absolute pressure and absolute temperature after the addition of the test gas are recorded. The effective volume of the gas control volume is calculated based on the difference in gas mass before and after the addition of the gas and the corresponding gas state relationship.

[0028] Pressure and temperature detection positions are configured in each gas control volume to measure the absolute pressure and absolute temperature of the corresponding gas control volume; an upstream gas status detection position is also configured upstream of the first valve to measure the absolute pressure and absolute temperature upstream of the first valve. A terminal mass flow detection device is configured downstream of each gas control volume to measure the terminal mass flow rate of the valve group leaving the valve group response test gas path.

[0029] No other open gas branches are set between the target valve and the mass flow detection position at the end of the valve group, so that the mass flow at the end of the valve group constitutes the only mass outflow downstream of the target valve.

[0030] The upstream of the valve assembly response test gas path is supplied with test gas via a pressure stabilizing device, which maintains a constant set value during a single response test. In one embodiment, the valve assembly terminal uses a fixed throttling element or maintains a fixed opening of the throttling device; in another embodiment, the valve assembly terminal is connected to a back pressure regulating device, which maintains a constant back pressure set value during a single response test.

[0031] Thus, a test gas path is formed before the target valve actuates, which determines the gas control volume, the effective volume, the gas state detection position, and the mass outflow boundary.

[0032] S2. Based on the absolute pressure, absolute temperature, and effective volume of each gas control volume, the transient gas inventory of each gas control volume changes over time.

[0033] After the gas control volume is determined, it is necessary to further determine how much gas has actually increased or decreased in each gas control volume during the operation of the target valve. Therefore, this invention synchronously collects the absolute pressure, absolute temperature and mass flow rate at the end of the valve group of each gas control volume, and converts the absolute pressure and absolute temperature of each gas control volume into the corresponding transient gas mass.

[0034] During a single response test, the type and composition of the test gas remain constant. When using a pre-prepared gas mixture, the molar ratios of each gas component determined during gas mixing are used. When using actual fuel gas, the molar ratios of each gas component are obtained through gas composition analysis. When the test gas is a single gas, the specific gas constant corresponding to that gas is directly used. When the test gas is a mixture, the molar mass of each component is weighted according to its molar ratio to obtain the average molar mass of the mixture. Then, the specific gas constant is obtained by dividing the universal gas constant by the average molar mass of the mixture. .

[0035] To determine whether the gas path has entered a stable state, the response time of each detection device is read from the equipment parameters of the pressure detection device, temperature detection device, and mass flow detection device, and the maximum value of the response time of each detection device is taken as the stable observation time.

[0036] For each pressure detection location, the measurement resolution given in the product technical manual or factory technical data of the corresponding pressure detection device under the current operating range is read, and this measurement resolution is used as the allowable pressure fluctuation value for the corresponding pressure detection location. For each temperature detection location, the measurement resolution given in the product technical manual or factory technical data of the corresponding temperature detection device is read, and this measurement resolution is used as the allowable temperature fluctuation value for the corresponding temperature detection location. For each mass flow detection location, the measurement resolution given in the product technical manual or factory technical data of the corresponding mass flow detection device is read, and this measurement resolution is used as the allowable mass flow fluctuation value for the corresponding mass flow detection location. In other embodiments, the implementer may also set the allowable fluctuation values ​​of pressure, temperature, and mass flow under stable conditions according to the product technical requirements, test procedures, or overall machine factory inspection requirements corresponding to the gas valve assembly to be tested.

[0037] Keeping the upstream pressure regulator's supply pressure, the non-target valve position, and the settings of the valve assembly's fixed throttling device or back pressure regulating device unchanged, the target valve is first positioned in the target state for this response test. The absolute pressure and temperature upstream of the first valve, the absolute pressure and temperature of each gas control volume, and the mass flow rate at the valve assembly's end are continuously collected. The target state for an opening action is the open state, and the target state for a closing action is the closed state. All pressure, temperature, and mass flow rate data, as well as the target valve's action commands, are recorded using the same hardware clock.

[0038] From the continuously collected data, continuous data windows of equal length to the stable observation time are extracted sequentially according to the sampling time. Within each continuous data window, the difference between the maximum and minimum absolute pressure values ​​is calculated for each pressure detection location, the difference between the maximum and minimum absolute temperature values ​​is calculated for each temperature detection location, and the difference between the maximum and minimum mass flow rates at the valve assembly end is calculated. When each difference is not greater than the allowable fluctuation value of the corresponding detection location, the first continuous data window that meets the above conditions is determined as the target state reference interval, and the detection data within this continuous data window is recorded as the target state reference data.

[0039] After establishing the target state reference interval, the target valve is restored to its initial state for this response test. The initial state for opening is closed, and the initial state for closing is open. Absolute pressure and temperature upstream of the first valve, absolute pressure and temperature of each gas control volume, and mass flow rate at the valve assembly terminal are continuously collected. From the continuously collected data, continuous data windows of equal length to the stable observation time are sequentially extracted according to the sampling time. Within each continuous data window, the difference between the maximum and minimum absolute pressure values ​​is calculated for each pressure detection location, the difference between the maximum and minimum absolute temperature values ​​is calculated for each temperature detection location, and the difference between the maximum and minimum mass flow rates at the valve assembly terminal is calculated. When each difference is not greater than the allowable fluctuation value for the corresponding detection location, the first continuous data window that meets the above conditions is determined as the effective stable interval before the action.

[0040] After the effective stable range before operation is formed, the arithmetic mean of the absolute temperatures upstream of the first valve within the effective stable range before operation is used as the property calculation temperature; when the test gas is a single gas, the specific heat ratio of that gas at the property calculation temperature is used. When the test gas is a mixture, the molar isobaric specific heat and molar isovolumic specific heat of each component at the calculated temperature are weighted according to the molar ratio of each gas component to obtain the molar isobaric specific heat and molar isovolumic specific heat of the mixture. The ratio of the two is then used to obtain the specific heat ratio. Then, the corresponding opening or closing command for this test is sent to the target valve, and the time when the target valve action command is issued is recorded as... The official response time starts from Initially, after the target valve is activated, the detection data will continue to be collected synchronously according to the predetermined sampling cycle.

[0041] When the detection device has a fixed channel delay, read the channel delay parameter given by the detection device or use the channel delay value pre-calibrated by the test system to correct the timestamp of the corresponding detection data.

[0042] For the Each gas control volume converts synchronously measured absolute pressure, absolute temperature, and effective volume into time-varying values. Transient gas inventory: ; In the formula, Numbering of gas control volume ; For the first The gas control volume at time Transient gas inventory; For the first The gas control volume at time Absolute pressure; For the first The effective volume of the gas control volume; For the first The test gas in the gas control volume at time... The compressibility factor corresponds to the gas state. The compressibility factor is a dimensionless correction coefficient used to characterize the deviation of the actual gas state from the ideal gas state. This embodiment targets the test conditions of low-pressure gas valve assemblies commonly used in burners. The transient gas volume in each gas control volume is calculated according to the ideal gas state relationship. Therefore, the compressibility factor... Take 1, in embodiments where the influence of actual gas deviation from ideal gas needs to be considered, with the first... The gas control volume at time The absolute pressure obtained by detection and absolute temperature Using this as a query condition, the corresponding compressibility factor is retrieved from the physical property data of the currently tested gas. ; This is the specific gas constant of the gas currently being tested; For the first The gas control volume at time The absolute temperature.

[0043] This results in a transient gas inventory sequence for each gas control volume as the sampling time changes. An increase in transient gas inventory indicates that the corresponding gas control volume is accumulating gas, while a decrease in transient gas inventory indicates that the corresponding gas control volume is releasing gas.

[0044] S3. Obtain the actual cross-valve mass flow rate of the target valve based on the cumulative gas inventory change downstream of the target valve and the mass flow rate at the end of the valve group.

[0045] The transient gas volume of each gas control volume can reflect whether gas is accumulating or being released in the intervalve space. However, the change in the gas volume of a gas control volume depends on both upstream gas inflow and downstream gas outflow. The actual mass flow rate passing through the target valve cannot be determined solely based on the change in volume. Therefore, this invention combines the mass flow rate at the end of the valve group with the change in the total gas volume downstream of the target valve to determine the actual cross-valve mass flow rate of the target valve.

[0046] For the The target valve will be the first The gas control volume up to the first The transient gas inventory of each gas control volume at the same sampling time is added together to form the cumulative gas inventory downstream of the target valve. The cumulative gas inventory downstream of the target valve represents the total mass of test gas that has passed through the target valve, is located in the gas control volume downstream of the target valve, and has not yet flowed out from the mass flow detection position at the end of the valve assembly.

[0047] There are no other open gas branches between the target valve and the mass flow detection position at the end of the valve assembly; therefore, the actual cross-valve mass flow of the target valve satisfies the following: ; In the formula, For the first The target valve at time Actual cross-valve mass flow rate along the normal flow direction of the gas; For a moment The mass flow rate at the valve assembly end; For the first The cumulative gas inventory downstream of the target valve corresponding to each target valve; The cumulative gas inventory downstream of the target valve over time The first rate of change.

[0048] Among them, the cumulative gas inventory downstream of the target valve varies with time. The first-order rate of change is determined using the central difference method, specifically: for the sampling time... Using sampling time The cumulative gas volume downstream of the target valve at the next sampling time minus the sampling time The sampling time is obtained by dividing the cumulative gas volume downstream of the target valve at the previous sampling time by the time interval between the two sampling times. The cumulative gas inventory downstream of the target valve over time The first rate of change.

[0049] When the target valve performs the opening action, after the target valve begins to form actual flow, some of the test gas first enters the gas control volume downstream of the target valve. When the cumulative gas volume downstream of the target valve increases, its first-order rate of change is positive. The actual cross-valve mass flow rate of the target valve is greater than the mass flow rate at the end of the valve group at the same moment, indicating that a portion of the test gas that has passed through the target valve is increasing the gas volume downstream of the target valve.

[0050] When the target valve performs a closing action, after the actual cross-valve mass flow rate of the target valve begins to decrease, the test gas already stored downstream of the target valve can still continue to be released to the mass flow outlet boundary; when the cumulative gas storage downstream of the target valve decreases, its first-order rate of change is negative, and the mass flow rate at the end of the valve group can be greater than the actual cross-valve mass flow rate of the target valve for a period of time.

[0051] In an embodiment where a single test requires obtaining the actual cross-valve mass flow rate of multiple series valves simultaneously, the series gas path maintains that no additional open gas branches are present. First, the mass flow rate at the end of the valve assembly is used as the mass outflow of the downstream gas control volume. The mass flow rate at the end of the valve assembly is then added to the first-order rate of change of the transient gas inventory in the downstream gas control volume over time to obtain the actual cross-valve mass flow rate of the downstream valve. Subsequently, for the upstream gas control volume adjacent to this valve, the already obtained actual cross-valve mass flow rate of the downstream valve is used as the mass outflow of the upstream gas control volume, and then added to the first-order rate of change of the transient gas inventory in the upstream gas control volume over time to obtain the actual cross-valve mass flow rate of the corresponding upstream valve. This recursive relationship is then used to calculate upstream sequentially to obtain the actual cross-valve mass flow rate of each series valve.

[0052] S4. Based on the upstream absolute pressure, upstream absolute temperature and downstream absolute pressure of the target valve, a gas flow driving force term is formed and the local effective flow parameters of the target valve are obtained.

[0053] The actual cross-valve mass flow rate of the target valve can represent the actual gas mass passing through the target valve. However, this mass flow rate is affected by both the local effective flow capacity of the target valve and the gas state on both sides of the target valve. For example, even if the local flow capacity of the target valve remains unchanged, changes in the upstream or downstream absolute pressure can still alter the actual cross-valve mass flow rate. Therefore, this invention generates a gas flow driving force term based on the gas state on both sides of the target valve, and then uses the actual cross-valve mass flow rate of the target valve and the gas flow driving force term to generate the local effective flow parameters of the target valve.

[0054] Specifically, when the first valve is the target valve, the absolute pressure and absolute temperature upstream of the target valve are taken from the detection results of the gas state detection position upstream of the first valve, and the absolute pressure downstream of the target valve is taken from the detection result of the first gas control volume; when the first... The valve is the target valve and At that time, the absolute pressure and absolute temperature upstream of the target valve are taken as the first... The detection results of the gas control volume, the absolute pressure downstream of the target valve is taken as the first... The test results for the gas control volume.

[0055] The first The target valve at time The ratio of downstream absolute pressure to upstream absolute pressure is defined as the pressure ratio. Based on the critical pressure ratio relationship for isentropic flow of compressible gases, the critical pressure ratio of the gas currently being tested is... Due to specific heat ratio It is determined that the critical pressure ratio satisfies: In the formula, This refers to the specific heat ratio of the gas currently being tested. This represents the critical pressure ratio corresponding to the current test gas.

[0056] This embodiment conducts response tests according to the normal gas supply direction, where the test gas flows from upstream to downstream of the gas valve assembly. During the test, the absolute pressure upstream of the target valve is greater than the absolute pressure downstream of the target valve; therefore, the ratio of the absolute pressure downstream of the target valve to the absolute pressure upstream of the target valve is greater than 0 and less than 1.

[0057] Even if the effective flow state of the target valve itself remains unchanged, the actual mass flow rate through the target valve will still change with the absolute pressure upstream of the target valve, the absolute temperature upstream of the target valve, and the pressure ratio across the target valve. Therefore, the actual cross-valve mass flow rate of the target valve cannot be directly calculated. All changes are directly reflected as changes in the flow state of the target valve itself. When the pressure ratio Greater than the critical pressure ratio Furthermore, when the value is less than 1, the gas flow through the target valve is in a noncritical flow state. Changes in the absolute pressure downstream of the target valve will still alter the mass flow rate through the target valve. Therefore, the flow-driving effect formed by the gas states on both sides of the target valve is simultaneously related to the upstream absolute pressure, upstream absolute temperature, and pressure ratio. At this point, the first... The target valve at time The gas flow driving force term satisfies: ; In the formula, For the first The target valve at time The driving force term for gas flow; For the first The target valve at time The absolute pressure upstream; This is the specific gas constant of the gas currently being tested; For the first The target valve at time The absolute temperature upstream; This refers to the specific heat ratio of the gas currently being tested. For the first The pressure ratio of each target valve.

[0058] When the pressure ratio Greater than 0 and not greater than the critical pressure ratio At this point, the gas flow through the target valve is in a critical flow state. Further reducing the absolute pressure downstream of the target valve no longer increases the mass flow rate through the target valve according to a non-critical flow relationship. Therefore, the pressure ratio corresponding to the flow drive section is determined according to a critical flow relationship. At this point, the... The target valve at time The gas flow driving force term satisfies: ; In the formula, For the first The target valve at time The driving force term for gas flow; For the first The target valve at time The absolute pressure upstream; This is the specific gas constant of the gas currently being tested; For the first The target valve at time The absolute temperature upstream; This refers to the specific heat ratio of the gas currently being tested. For the first The pressure ratio of each target valve.

[0059] Gas flow driving force terms obtained in both cases Both are used to represent time. The gas flow driving force resulting from the pressure on both sides of the target valve and the upstream temperature, that is, when the flow state of the target valve itself remains unchanged, the change in the actual cross-valve mass flow rate of the target valve with respect to the upstream pressure, upstream temperature, and pressure on both sides is mainly driven by the gas flow driving force term. reflect.

[0060] The actual cross-valve mass flow rate of the target valve With gas flow driving force term The ratio of these values ​​is used as the effective flow parameter for the target valve in a localized area. ; In the formula, For the first The target valve at time The target valve's local effective flow parameters are used to characterize the target valve's local effective flow capacity under the gas flow driving force at that moment. For the first The target valve at time Actual cross-valve mass flow rate; For the first The target valve at time The driving force term for gas flow.

[0061] S5. Determine the local response of the target valve and the gas supply response at the end of the valve group based on the local effective flow parameters of the target valve and the mass flow rate at the end of the valve group.

[0062] The local effective flow parameters of the target valve characterize the change in the local effective flow capacity at the location of the target valve, while the mass flow rate at the end of the valve group characterizes the actual end gas supply change of the entire gas valve group. The dimensions and numerical ranges before and after the action are different for the two. Therefore, a reference before the action and a reference after the action are established separately, and the two are converted to the same 0 to 1 response process scale.

[0063] Specifically, the arithmetic mean of all local effective flow parameters of the target valve within the effective stable range before actuation is taken to form the local effective flow reference before the target valve actuation. The arithmetic mean of the mass flow rates at the end of all valve groups within the effective stable range before the action is taken is used to form the gas supply reference before the valve group's end action. .

[0064] The arithmetic mean of the local effective flow parameters of all target valves within the target state reference interval is used to form the target valve target state reference benchmark. The arithmetic mean of the mass flow rates at the end of all valve groups within the target state reference interval is used to form the target state reference benchmark for the valve group ends. The start action uses the target state reference range formed by the start state, and the stop action uses the target state reference range formed by the stop state.

[0065] If the target valve's target state reference is equal to the local effective flow reference before the target valve operates, then the target valve's local response test result is unqualified; if the valve group's end target state reference is equal to the valve group's end air supply reference before the valve group operates, then the valve group's end air supply response test result is unqualified.

[0066] For response objects where the target state reference base is not equal to the corresponding pre-action reference base, the pre-action reference base and the target state reference base are respectively used as the 0 state and 1 state of the response trajectory to form the corresponding response trajectory: ; ; In the formula, For the first The target valve at time The local effective normalized response value; For the first The target valve at time The target valve's local effective flow parameters; This serves as the local effective flow reference before the target valve actuates. This serves as a reference point for the target valve's target state. For a moment The normalized response value of the valve group's end air supply; For a moment The mass flow rate at the valve assembly end; This serves as the reference for air supply before the valve assembly's end-stage operation. This serves as a reference for the target state at the end of the valve assembly.

[0067] The local effective flow response trajectory of the target valve at the sampling time The x-axis represents the local effective current normalized response value at that sampling time. The vertical axis represents the effective air supply response trajectory at the valve assembly terminal, with the sampling time as the vertical axis. The x-axis represents the normalized response value of the valve group's end-gas supply at the sampling time. The vertical axis represents the trajectory of the local effective flow response of the target valve, where the local effective flow parameters of the target valve are... Equal to the local effective flow reference before the target valve actuates At that time, based on the above normalization relationship, we obtain ,when Equal to the target valve target state reference base At that time, ,therefore, This indicates that the target valve is in its pre-action state during this response test. This indicates that the target valve has reached the target state of this response test; for the effective air supply response trajectory at the end of the valve group, when the mass flow rate at the end of the valve group... equal to the air supply reference before the valve assembly terminal action At that time, based on the above normalization relationship, we obtain ,when Equal to the target state reference of the valve assembly end At that time, ,therefore, This indicates that the valve assembly is in the pre-operation air supply state before this response test. This indicates that the valve assembly has reached the target gas supply state for this response test.

[0068] Set the start response determination ratio before a response test begins. and completion rate of response judgment The start response determination ratio is greater than 0, the completion response determination ratio is less than 1, and the start response determination ratio is less than the completion response determination ratio; the target valve's local effective flow response trajectory and the valve group's end effective air supply response trajectory use the same set of determination ratios. In a preferred embodiment, Take 0.1, Take 0.9.

[0069] For the established local effective flow response trajectory of the target valve, from the moment of the target valve's action command... Begin by finding the first group that satisfies the condition that the previous sample value is less than 1. The next sample value is greater than or equal to The adjacent sampling points are used, and linear interpolation is performed between two adjacent sampling points to make the response trajectory equal to The moment when the target valve begins to respond locally is determined; continue searching along the time-increasing direction for the first set of values ​​that satisfy the previous sample value being less than... The next sample value is greater than or equal to The adjacent sampling points are used to interpolate the response trajectory to equal the linear interpolation. The moment when the target valve completes its local response is determined.

[0070] For the established effective air supply response trajectory at the end of the valve group, starting from the moment of the target valve action command... Begin by finding the first group whose previous sample value is less than... The next sample value is greater than or equal to Adjacent sampling points are used, and the start time of the valve group's end response is determined by linear interpolation; the search continues to find the first group of samples where the previous sample value is less than... The next sample value is greater than or equal to The adjacent sampling points are used to determine the valve group's end response time through linear interpolation.

[0071] At the time of the target valve action command Starting from this point, when the local effective flow response trajectory of the target valve first reaches the completion response judgment ratio... The target valve partial response test result is qualified when the target valve completes its partial response time no later than the cutoff time corresponding to the target valve's maximum allowable response time; otherwise, the target valve partial effective flow response trajectory does not reach the completion response judgment ratio before the cutoff time corresponding to the target valve's maximum allowable response time. When the test result for the local response of the target valve is found to be unqualified, the maximum permissible response time of the target valve is obtained from the product technical requirements or factory inspection documents corresponding to the target valve under test.

[0072] When the effective gas supply response trajectory at the valve assembly end reaches the completion response judgment ratio for the first time The valve assembly terminal gas supply response test result is qualified when the valve assembly terminal completes its response time no later than the cutoff time corresponding to the maximum allowable response time of the valve assembly terminal; otherwise, the valve assembly terminal effective gas supply response trajectory does not reach the completion response judgment ratio before the cutoff time corresponding to the maximum allowable response time of the valve assembly terminal. If the gas supply response test result at the valve assembly terminal is not met, the maximum permissible response time at the valve assembly terminal should be obtained from the product technical requirements or the factory inspection documents of the gas valve assembly under test.

[0073] This results in the following test results: the local start time of the target valve response, the local completion time of the target valve response, the local response test results of the target valve, the start time of the valve group end response, the completion time of the valve group end response, and the gas supply response test results of the valve group end.

[0074] S6. Based on the time difference between the corresponding response of the local response of the target valve and the gas supply response at the end of the valve group, and the change in the cumulative gas inventory downstream of the target valve during the corresponding time period, an additional response of the downstream gas path of the target valve is formed.

[0075] The start response time difference is calculated by subtracting the local start response time of the target valve from the start response time of the valve assembly's end point; the completion response time difference is calculated by subtracting the local completion response time of the target valve from the completion response time of the valve assembly's end point. Both the start response time difference and the completion response time difference retain their calculated positive or negative signs: a positive value indicates that the corresponding response at the valve assembly's end point is later than the corresponding response at the local point of the target valve; a negative value indicates that the corresponding response at the valve assembly's end point is earlier than the corresponding response at the local point of the target valve; and zero indicates that the corresponding response times at both positions are the same.

[0076] The change in the cumulative gas inventory downstream of the target valve during the initial response interval is calculated by subtracting the cumulative gas inventory downstream of the target valve during the partial initial response interval from the cumulative gas inventory downstream of the target valve at the initial response time at the end of the valve group. Similarly, the change in the cumulative gas inventory downstream of the target valve during the completed response interval is calculated by subtracting the cumulative gas inventory downstream of the target valve during the partial completion response interval from the cumulative gas inventory downstream of the target valve at the final response time at the end of the valve group. When either the initial or completed response time falls between two adjacent sampling times, linear interpolation is performed based on the cumulative gas inventory downstream of the target valve at the two adjacent sampling times to obtain the corresponding cumulative gas inventory downstream of the target valve at the response time.

[0077] The start response time difference, the completion response time difference, the cumulative change in gas inventory downstream of the target valve during the start response interval, and the cumulative change in gas inventory downstream of the target valve during the completion response interval together constitute the additional response of the downstream gas path of the target valve, and serve as the output data of the current response test.

[0078] When the target valve performs its opening action, if the start response time difference or completion response time difference is positive, and the corresponding change in the cumulative gas volume downstream of the target valve is positive, it indicates that the local flow response of the target valve precedes the gas supply response at the end of the valve assembly. Between the local response time of the target valve and the corresponding response time at the end of the valve assembly, some of the test gas that has already passed through the target valve first enters the gas control volumes downstream of the target valve, increasing the cumulative gas volume downstream of the target valve. When the local response test result of the target valve is qualified, but the gas supply response test result at the end of the valve assembly is unqualified, it indicates that the local flow response of the target valve itself has met the response time requirement, but the gas supply response at the end of the gas valve assembly has not met the response time requirement, and this lag in the end response is accompanied by the gas filling process of the gas storage space downstream of the target valve.

[0079] When the target valve performs a closing action, if the start response time difference or completion response time difference is positive, and the corresponding change in the cumulative gas inventory downstream of the target valve is negative, it indicates that the local flow response of the target valve precedes the gas supply response at the end of the valve assembly. Between the local response time of the target valve and the corresponding response time at the end of the valve assembly, the test gas originally stored in the gas control volumes downstream of the target valve continues to be released to the end of the valve assembly, reducing the cumulative gas inventory downstream of the target valve. When the local response test result of the target valve is qualified, but the gas supply response test result at the end of the valve assembly is unqualified, it indicates that the local flow response of the target valve itself has met the response time requirement, but the response of the gas valve assembly to stop supplying gas has not met the response time requirement, and this lag in the end response is accompanied by the gas release process in the gas storage space downstream of the target valve.

[0080] The current response test ultimately generates the target valve's local response test result, the valve group's end gas supply response test result, and the target valve's downstream gas path additional response. For gas valve groups that require sequential testing of multiple valves in series, a complete response test is performed once according to the predetermined target valve sequence, generating the target valve's local response test result, valve group's end gas supply response test result, and target valve's downstream gas path additional response for each target valve.

[0081] This invention also discloses a water-cooled premixed burner valve group response testing system, including a processor and a memory. The memory stores computer program instructions, and when the computer program instructions are executed by the processor, a water-cooled premixed burner valve group response testing method according to the present invention is implemented.

[0082] The system also includes other components well known to those skilled in the art, such as communication buses and communication interfaces, the settings and functions of which are known in the art and will not be described in detail here.

[0083] In the description of this specification, "multiple" or "several" means at least two, such as two, three or more, unless otherwise expressly and specifically defined.

[0084] While this specification has shown and described numerous embodiments of the invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in the practice of this invention.

Claims

1. A method for testing the response of a water-cooled premixed burner valve assembly, characterized in that, include: The gas storage space between adjacent valves in the series gas valve group and between the downstream valve and the mass flow detection position at the end of the valve group are divided into gas control volumes, and there are no other open gas branches between the target valve and the mass flow detection position at the end of the valve group. The transient gas inventory of each gas control volume is formed based on the absolute pressure, absolute temperature, and effective volume of each gas control volume over time. The transient gas inventory of each gas control volume downstream of the target valve is added together to form the cumulative gas inventory downstream of the target valve. The actual cross-valve mass flow rate of the target valve is obtained by adding the mass flow rate at the end of the valve group with the first-order rate of change of the cumulative gas inventory downstream of the target valve over time. Based on the upstream absolute pressure, upstream absolute temperature and downstream absolute pressure of the target valve, a gas flow driving force term is formed according to the compressible gas flow relationship, and the ratio of the actual cross-valve mass flow rate of the target valve to the gas flow driving force term is used as the local effective flow parameter of the target valve. The local response of the target valve and the gas supply response at the end of the valve group are determined based on the local effective flow parameters of the target valve and the mass flow rate at the end of the valve group, respectively. The additional response of the downstream gas path of the target valve is formed based on the difference between the corresponding response times and the change in the cumulative gas inventory downstream of the target valve during the corresponding time period.

2. The method for testing the response of a water-cooled premixed burner valve assembly according to claim 1, characterized in that, The gas storage space between adjacent valves in the series gas valve group and between the downstream valve and the mass flow detection position at the end of the valve group are respectively divided into gas control volumes, including: Using the flow control cross-section of each valve in series as the boundary between adjacent gas control volumes, the first... Downstream of the flow control section of the valve to the first The space for storing test gas between the upstream side of the flow control section of each valve is divided into the first... The gas control volume is defined as the space between the downstream side of the flow control section of the downstream valve and the mass flow detection position at the end of the valve assembly that can store test gas. Among them, the valve cavity inside the valve body located downstream of the flow control section and connected to the downstream pipeline is included in the corresponding gas control volume.

3. The method for testing the response of a water-cooled premixed burner valve assembly according to claim 1, characterized in that, The transient gas inventory satisfies the expression: ； In the formula, Number the gas control volume; For the first The gas control volume at time Transient gas inventory; For the first The gas control volume at time Absolute pressure; For the first The effective volume of the gas control volume; For the first The test gas in the gas control volume at time... The compressibility factor corresponding to the gas state; This is the specific gas constant of the gas currently being tested; For the first The gas control volume at time The absolute temperature.

4. The method for testing the response of a water-cooled premixed burner valve assembly according to claim 1, characterized in that, The process of forming a gas flow driving force term according to the compressible gas flow relationship includes: The ratio of the absolute pressure downstream of the target valve to the absolute pressure upstream of the target valve is used as the pressure ratio. The critical pressure ratio is determined based on the specific heat ratio of the test gas. When the pressure ratio is greater than the critical pressure ratio but less than 1, the gas flow driving force term is formed according to the compressible gas flow relationship corresponding to the non-critical flow state. When the pressure ratio is greater than 0 but not greater than the critical pressure ratio, the gas flow driving force term is formed according to the compressible gas flow relationship corresponding to the critical flow state.

5. The method for testing the response of a water-cooled premixed burner valve assembly according to claim 4, characterized in that, When the pressure ratio is greater than the critical pressure ratio and less than 1, the gas flow driving force term satisfies the following expression: ; When the pressure ratio is greater than 0 and not greater than the critical pressure ratio, the gas flow driving force term satisfies the following expression: ; In the formula, For the first The target valve at time The driving force term for gas flow; The absolute pressure upstream of the target valve; The absolute temperature upstream of the target valve; Pressure ratio; The specific gas constant of the gas currently being tested; This represents the specific heat ratio of the gas currently being tested.

6. The method for testing the response of a water-cooled premixed burner valve assembly according to claim 1, characterized in that, The process of determining the local response of the target valve and the gas supply response at the end of the valve group based on the local effective flow parameters of the target valve and the mass flow rate at the end of the valve group, respectively, includes: The arithmetic mean of the local effective flow parameters of the target valve within the effective stable interval before action is taken to form the local effective flow reference before the target valve action; the arithmetic mean of the mass flow rate at the end of the valve group within the effective stable interval before action is taken to form the gas supply reference at the end of the valve group before action; the arithmetic mean of the local effective flow parameters of the target valve within the target state reference interval is taken to form the target state reference reference of the target valve; the arithmetic mean of the mass flow rate at the end of the valve group within the target state reference interval is taken to form the target state reference reference at the end of the valve group. Based on the local effective flow reference before the target valve operates and the target valve target state reference, the local effective flow parameters of the target valve at each sampling time are linearly normalized to obtain the local effective flow normalized response value, and the local effective flow response trajectory of the target valve is constructed according to the sampling time sequence. Based on the gas supply reference before the valve group's end action and the valve group's end target state reference, the mass flow rate of the valve group's end at each sampling time is linearly normalized to obtain the normalized gas supply response value of the valve group's end, and the effective gas supply response trajectory of the valve group's end is constructed according to the sampling time sequence.

7. The method for testing the response of a water-cooled premixed burner valve assembly according to claim 6, characterized in that, Also includes: Set the start response judgment ratio and the completion response judgment ratio. Starting from the moment the target valve is activated, determine the moment when the local effective flow response trajectory of the target valve first reaches the start response judgment ratio and the completion response judgment ratio, and determine the moment when the target valve is locally activated and the moment when the target valve is locally completed. Starting from the moment the target valve is activated, determine the moment when the effective gas supply response trajectory at the end of the valve group first reaches the start response judgment ratio and the completion response judgment ratio, and determine the moment when the valve group is completed.

8. The method for testing the response of a water-cooled premixed burner valve assembly according to claim 7, characterized in that, Also includes: Starting from the moment of the target valve's action command, the cutoff moment corresponding to the maximum allowable response time of the target valve is determined based on the maximum allowable response time of the target valve. When the moment when the target valve partially completes its response is not later than the cutoff moment corresponding to the maximum allowable response time of the target valve, the result of the local response test of the target valve is qualified. When the moment when the target valve partially completes its response is later than the cutoff moment corresponding to the maximum allowable response time of the target valve, or when the effective flow response trajectory of the target valve in the local area has not reached the completion response judgment ratio before the cutoff moment corresponding to the maximum allowable response time of the target valve, the result of the local response test of the target valve is unqualified. Starting from the moment of the target valve action command, the cutoff time corresponding to the maximum allowable response time of the valve group is determined according to the maximum allowable response time of the valve group end. When the valve group end completes the response time no later than the cutoff time corresponding to the maximum allowable response time of the valve group end, the valve group end air supply response test result is qualified. If the valve assembly terminal completes its response later than the cutoff time corresponding to the maximum allowable response time of the valve assembly terminal, or if the effective gas supply response trajectory of the valve assembly terminal does not reach the completion response judgment ratio before the cutoff time corresponding to the maximum allowable response time of the valve assembly terminal, the gas supply response test result of the valve assembly terminal is unqualified.

9. The method for testing the response of a water-cooled premixed burner valve assembly according to claim 7, characterized in that, The process of generating an additional downstream gas path response for the target valve based on the difference between the corresponding response times and the change in the cumulative gas inventory downstream of the target valve during the corresponding time period includes: The start response time difference is formed by the start response time of the valve group end and the start response time of the target valve part. The completion response time difference is formed by the completion response time of the valve group end and the completion response time of the target valve part. The cumulative gas inventory change of the target valve downstream in the two corresponding response periods is determined respectively. The additional response of the downstream gas path of the target valve is formed by the start response time difference, the completion response time difference and the corresponding cumulative gas inventory change of the target valve downstream.

10. A water-cooled premixed burner valve assembly response testing system, characterized in that, include: A processor and a memory, wherein the memory stores computer program instructions that, when executed by the processor, implement a water-cooled premixed burner valve group response test method according to any one of claims 1-9.

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