Air pressure test system and method

Abstract

The invention relates to an air pressure test system and method, and the system comprises an inflation unit which is used for providing high-pressure air for a target chamber and is sequentially connected with an air source cylinder, a first pressure regulating device, a booster pump, a flowmeter and a second pressure regulating device, and the first pressure regulating device is used for regulating the air inlet pressure entering the booster pump; the booster pump is used for boosting gas pressure to meet the pressurizing requirement; the flow meter and the second pressure regulating device are used for regulating the flow pressure of gas entering the target chamber; the operation gas supply unit comprises an operation gas cylinder and a third pressure regulating device, is connected to the booster pump and is used for providing operation gas for the booster pump and controlling the pressurization rate; the control unit comprises a PLC (Programmable Logic Controller) control module and an upper computer, is in signal connection with each pressure regulating device, the flow meter and the booster pump, and is used for automatically regulating each component; and the pressure relief protection unit comprises a pressure relief device and is used for releasing the gas pressure of the target chamber when the gas pressure test is finished. The device is convenient to operate, high in automation degree and comprehensive in protection measures, and the test efficiency and the operation safety and convenience are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of SCO2 Brayton power generation, and specifically relates to a gas pressure test system and method. More specifically, it relates to a system and method for gas pressure test of a SCO2 Brayton power generation system compression turbine integrated unit. Background Art

[0002] The SCO2 Brayton cycle power generation system is a power system device based on closed Brayton cycle power generation technology, which converts various forms of energy into electrical energy by configuring different heat sources. The compressor-turbine integrated unit, as the core equipment of the power generation system, consists of a compressor, a turbine, an integrated motor, bearings, dry gas seals, etc., and has the functions of compressing, expanding, and generating electricity for the working fluid. In order to ensure the safe and stable operation of the unit, an air pressure test is carried out before the unit is put into production to check whether the structural strength and sealing of the unit meet the use requirements.

[0003] The dry gas seal is a key sealing component for the unit to prevent leakage of working fluid. It is composed of a rotating dynamic ring, a static ring, a spring, a spring seat, a sealing ring, and a sleeve. As a new type of non-contact seal, the gap value formed by the dynamic ring and the static ring in the working state is determined by special design and experimental research for working fluid units in different operating states, and is a very important parameter. In order to ensure that the gap value operates within the working range required by the design, there are specific requirements for the air supply flow of the dry gas seal. If the conventional air pressure test method is used to perform a pressure test on the unit, the spring may be overloaded or fail due to improper pressure filling method and pressure control, thereby causing the gap value between the dynamic and static rings to be damaged under the corresponding pressure, making it unable to work within the normal design range. In order to avoid the above situation, a set of air pressure test systems specifically for this type of unit is required to meet the air pressure test requirements due to the special structure of the unit. Summary of the invention

[0004] In view of the above technical problems, the purpose of the present invention is to provide a gas pressure test system and method to support the implementation of the gas pressure test of the compression turbine integrated unit of the SCO2 Brayton cycle power generation system to meet the testing requirements of the gas pressure test; it has the characteristics of convenient operation, high degree of automation and comprehensive protection measures, which can improve the safety and convenience of the test operation, while also improving the efficiency of the gas pressure test of the compression turbine integrated unit, and effectively protecting the dry gas sealing device during the pressure test.

[0005] According to a first aspect of the present invention, there is provided a pneumatic test system, comprising:

[0006] The gas charging unit is used to provide high-pressure gas to the target chamber, and includes a gas source cylinder, a first pressure regulating device, a booster pump, a flow meter, and a second pressure regulating device connected in sequence, wherein:

[0007] The first pressure regulating device is used to regulate the intake pressure of the booster pump;

[0008] The booster pump is used to increase the gas pressure to meet the charging pressure requirement of the target chamber;

[0009] The flow meter and the second pressure regulating device are used to regulate and monitor the flow rate and pressure of the gas entering the target chamber;

[0010] an operating gas supply unit, comprising an operating gas cylinder and a third pressure regulating device, connected to the booster pump through a pipeline, for providing operating gas to the booster pump and controlling the boosting rate of the booster pump;

[0011] The control unit, including the PLC control module and the host computer, is connected to the signals of each pressure regulating device, flow meter and booster pump to monitor the pressure and flow in real time during the test and to automatically adjust each component;

[0012] The pressure relief protection unit includes a pressure relief device connected to the target chamber, which is used to release the gas pressure in the target chamber at the end of the air pressure test to ensure system safety.

[0013] In some technical solutions, the first pressure regulating device includes a first pressure gauge and a first pressure regulating valve, the first pressure gauge is used to monitor the pressure of the gas flowing out of the gas source cylinder, and the first pressure regulating valve is used to adjust the pressure of the gas entering the booster pump to prevent excessively high or low intake pressure from affecting the operation of the booster pump; and / or,

[0014] The second pressure regulating device includes a second pressure gauge and a second pressure regulating valve, the second pressure gauge is used to monitor the gas pressure in the target chamber, and the second pressure regulating valve is used to adjust the gas flow and pressure flowing out of the target chamber to ensure that the pressure demand of the target chamber is met; and / or,

[0015] The third pressure regulating device includes a pressure reducing valve, a third pressure gauge and a third pressure regulating valve. The pressure reducing valve is used to reduce the initial high pressure of the operating gas cylinder, the third pressure gauge is used to monitor the pressure of the operating gas provided to the boosting pump, and the third pressure regulating valve is used to adjust the pressure and flow of the operating gas, thereby accurately controlling the boosting rate of the boosting pump.

[0016] In some technical solutions, the outlet of the target chamber is connected to the air inlet pipe of the booster pump through a loop pipe to form a closed circulation structure, so that the test gas circulates between the target chamber and the booster pump.

[0017] In some technical solutions, a pressure stabilizing tank is provided on the connecting pipeline between the boosting pump and the flow meter, and the pressure stabilizing tank is used to buffer the pressure fluctuation of the boosting pump output to ensure the stability of the gas pressure entering the flow meter and the target chamber.

[0018] In some technical solutions, the system further includes a plurality of filters, namely:

[0019] A first filter disposed between the gas source cylinder and the first pressure regulating device, for filtering particulate matter and impurities in the gas entering the booster pump;

[0020] The second filter disposed between the booster pump and the flow meter is used to further filter the gas entering the target chamber to ensure that the cleanliness of the gas meets the test requirements;

[0021] The third filter arranged between the operating gas cylinder and the third pressure regulating device is used to filter impurities in the operating gas entering the booster pump.

[0022] In some technical solutions, the inflation unit further includes a safety valve, which is arranged at the outlet of the booster pump and is used to release excess gas when the system pressure exceeds a set value; and / or,

[0023] The inflation unit further comprises a one-way valve, which is arranged on a connecting pipeline between the booster pump and the flow meter to prevent the gas from flowing back to the booster pump.

[0024] In some technical solutions, the pressure relief device includes a pressure relief valve and a pressure relief pipeline. The pressure relief pipeline is connected to the target chamber and gradually releases the gas pressure in the target chamber through the pressure relief valve provided thereon.

[0025] In some technical solutions, the system is applied to the air pressure test of the supercritical carbon dioxide Brayton cycle compression turbine integrated unit to verify the sealing performance and structural strength of the unit within the target pressure range.

[0026] According to a second aspect of the present invention, there is further provided a pneumatic test method, which is applicable to the pneumatic test system described above, and comprises the following steps:

[0027] Inspection before air pressure test, including checking the connection of each interface, the effectiveness of pressure gauge and flow meter and the status of system equipment, to confirm that the system has the conditions for air pressure test;

[0028] Set the test target parameters, including the target chamber pressure and flow value, manually adjust the pressure reducing valve to adjust the pressure after the valve to the initial value, and start the air pressure test system;

[0029] Multi-stage inflation, gradually increasing the pressure of the target chamber to the set value;

[0030] Maintain the target chamber pressure and flow for a period of time and complete a leak check to confirm the test results;

[0031] Multi-stage pressure relief, by adjusting the pressure relief valve to gradually reduce the target chamber pressure until the pressure is emptied to complete the air pressure test.

[0032] In some technical solutions, the multi-stage inflation process of gradually increasing the pressure of the target chamber to a set value is specifically as follows:

[0033] Phase 1: By adjusting the first pressure regulating valve to control the flow meter reading to reach the set flow rate, the target chamber pressure is gradually increased;

[0034] The second stage: the booster pump starts to work, and the flow meter reading and chamber pressure stability are maintained by adjusting the opening of the third pressure regulating valve and the booster pump frequency;

[0035] Stage 3: After the target chamber pressure reaches the set value, the second pressure regulating valve starts to adjust, allowing the gas to flow from the target chamber to the front of the booster pump to form a flow cycle. At the same time, the third pressure regulating valve continues to adjust according to the flow signal feedback from the flow meter to ensure the stability of the gas flow and pressure in the target chamber.

[0036] and / or,

[0037] The multi-stage pressure relief described above is a process of gradually reducing the target chamber pressure by adjusting the pressure relief valve until the pressure is exhausted. Specifically, the process is as follows:

[0038] Phase 1: Slowly open the pressure relief valve to gradually reduce the pressure in the target chamber while controlling the flow meter flow;

[0039] The second stage: when the pressure of the target chamber drops to a certain value, the booster pump is stopped, and the flow meter flow is controlled by adjusting the opening of the first pressure regulating valve;

[0040] Stage 3: When the pressure in the target chamber further drops to a preset low value, the flow meter flow is no longer controlled, and the pressure relief valve is closed after the pressure in the target chamber is emptied.

[0041] The present invention adopts the above technical solution to have at least the following beneficial effects:

[0042] 1. The present invention realizes a high degree of coordination among the units through the overall architecture including the inflation unit, the operating gas supply unit, the control unit and the pressure relief protection unit; in particular, the control unit is combined with the PLC module to realize the real-time monitoring and automatic adjustment of the test parameters, greatly improving the stability, efficiency and safety of the test process; in addition, by clarifying the role and connection relationship of each unit, the system has stronger operability and flexibility;

[0043] 2. The present invention designs multi-stage pressurization, which gradually increases the pressure of the target chamber to the set value by controlling the pressure in stages, while maintaining the flow rate stable, ensuring the safety and accuracy of the test; in the first stage, the pressure regulating valve is used to accurately control the initial flow rate, steadily increase the chamber pressure, and avoid the impact of pressure fluctuations on the equipment; in the second stage, the frequency adjustment of the booster pump and the linkage control of the valve are used to maintain the stability of the flow rate and pressure; in the third stage, after the chamber reaches the target pressure, a flow cycle is formed, and the opening of the booster pump and the valve is dynamically adjusted to achieve an accurate balance between the flow rate and the pressure; this control logic significantly improves the safety and stability of the test process and the reliability of the results;

[0044] 3. The present invention designs multi-stage pressure relief, which ensures the safety and controllability of the pressure relief process by gradually reducing the pressure of the target chamber in stages, while avoiding impact on equipment and pipelines; in the first stage, the pressure relief valve is adjusted to open slowly, the flow meter flow is controlled, and the initial pressure release is achieved; in the second stage, when the pressure drops to a certain value, the valve control logic is switched, and the flow rate is maintained stable by accurately adjusting the opening of the pressure regulating valve to further reduce the chamber pressure; in the third stage, when the pressure is close to being exhausted, the valve is gradually closed to complete the complete release of the chamber pressure; the control logic ensures the stability and safety of the system during the pressure release process by dynamically adjusting the pressure relief rate;

[0045] 4. The present invention is provided with a multi-stage filter: a first filter, a second filter and a third filter, which are used for purifying the source gas and the operating gas respectively; this multi-stage filtering scheme significantly improves the cleanliness of the gas, effectively protects the equipment, and enhances the reliability of the test results;

[0046] 5. The present invention is not only applicable to the test of integrated compression turbine machines, but also extends to the fields of high-pressure pipelines, pressure vessels, etc. It has wide applicability and economic value and is commercially competitive. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings and their marks required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 This is a flow diagram of a pneumatic test system according to an embodiment of the present invention.

[0049] The meanings of the symbols in the figure are as follows:

[0050] 110—gas source cylinder, 121—first filter, 122—second filter, 131—first pressure gauge, 132—first pressure regulating valve, 140—boosting pump, 150—safety valve, 160—check valve, 170—pressure stabilizing tank, 180—flow meter, 191—second pressure gauge, 192—second pressure regulating valve;

[0051] 210—operating gas cylinder, 221—pressure reducing valve, 222—third pressure gauge, 223—third pressure regulating valve, 230—third filter;

[0052] 310—host computer; 410—pressure relief valve; 500—compression turbine integrated machine. DETAILED DESCRIPTION

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0054] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0055] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0056] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0058] The air pressure test of the integrated compressor turbine is used to verify the sealing performance and structural strength of the unit within the target pressure range. During the test, it often faces problems such as seal damage caused by pressure fluctuations, unstable flow control, system overpressure and waste of gas resources. At the same time, the traditional system lacks precise stage-by-stage regulation during the inflation and depressurization process, which can easily cause equipment safety hazards and inaccurate test results.

[0059] like Figure 1 According to an embodiment of the present invention, the air pressure test system includes an air charging unit, an operating gas supply unit, a control unit and a pressure relief protection unit, wherein the air charging unit is used to provide high-pressure gas to the compressor turbine integrated machine 500, and includes a gas source cylinder 110, a first pressure regulating device, a booster pump 140, a flow meter 180 and a second pressure regulating device connected in sequence. Specifically, the gas source cylinder 110 is a standard nitrogen high-pressure cylinder, which provides a gas source for the air pressure test. The pressure of the cylinder gradually decreases as the nitrogen is output; the first pressure regulating device is used to adjust the intake pressure entering the booster pump 140; the booster pump 140 is used to increase the gas pressure to meet the pressurization demand of the compressor turbine integrated machine 500; the flow meter 180 is used to measure the flow rate of the pressurized nitrogen, and the upstream air charging pressure and the boosting rate of the booster pump 140 are adjusted by monitoring the flow value to ensure that the dynamic and static ring clearances of the dry gas seal are within the set value. The second pressure regulating device is used to adjust and monitor the gas pressure entering the compressor turbine integrated machine 500; the operating gas supply unit includes an operating gas cylinder 210 and a third pressure regulating device, which is connected to the boost pump 140 through a pipeline, and is used to provide the boost pump 140 with operating gas as a power source and control the boosting rate of the boost pump 140; the control unit includes a PLC control module and a host computer 310, which are electrically connected to each pressure regulating device, flow meter 180 and boost pump 140 to establish a signal transmission relationship, and is used to monitor the pressure value of each part and the flow rate of the flow meter 180 during the test in real time, and automatically adjust each component; and the above-mentioned pressure relief protection unit, which includes a pressure relief device connected to the compressor turbine integrated machine 500, which is used to release the gas pressure of the compressor turbine integrated machine 500 at the end of the air pressure test to ensure system safety. In addition, the outlet of the integrated compressor-turbine machine 500 is connected to the air intake pipe of the boost pump 140 via a loop pipe, forming a closed circulation structure, so that the test gas circulates between the integrated compressor-turbine machine 500 and the boost pump 140.

[0060] This embodiment realizes precise control of gas pressure and flow, smooth regulation of multi-stage inflation and pressure relief, and recycling of test gas by designing a system architecture including an inflation unit, an operating gas supply unit, a control unit, and a pressure relief protection unit, combined with real-time monitoring and automatic regulation. This strategy effectively improves the test accuracy and safety of the system, reduces equipment loss and test costs, and ensures the reliability and consistency of the test results.

[0061] According to a specific implementation manner of the present embodiment, the first pressure regulating device includes a first pressure gauge 131 and a first pressure regulating valve 132. The first pressure gauge 131 is used to measure the pressure of nitrogen flowing out of the gas cylinder, and plays a role in monitoring the pressure of gas flowing out of the gas source cylinder 110, which serves as a reference for the subsequent adjustment of the intake pressure of the booster pump 140; the first pressure regulating valve 132 is used to adjust the pressure of the gas entering the booster pump 140 according to the inflation state downstream of the booster pump 140, so as to prevent excessively high or low intake pressure from affecting the operation of the booster pump 140.

[0062] According to a specific implementation manner of the present embodiment, the second pressure regulating device includes a second pressure gauge 191 and a second pressure regulating valve 192. The second pressure gauge 191 is used to monitor the pressure in the chamber of the compressor-turbine integrated machine 500, and the second pressure regulating valve 192 is used to adjust the reference; the second pressure regulating valve 192 is used to adjust the gas flow and pressure flowing out of the compressor-turbine integrated machine 500 to ensure that the charging demand of the compressor-turbine integrated machine 500 is met.

[0063] According to a specific implementation manner of the present embodiment, the third pressure regulating device includes a pressure reducing valve 221, a third pressure gauge 222 and a third pressure regulating valve 223. The pressure reducing valve 221 and the third pressure regulating valve 223 are controlled to provide operating gas within a specified pressure range to the boosting pump 140, which serves as a power source for the reciprocating action of the boosting pump 140 to pressurize the pressurized nitrogen. The boosting rate of the boosting pump 140 is also adjusted by proportionally adjusting the control range of the third pressure regulating valve 223.

[0064] According to a preferred embodiment of the inflation unit of the present invention, a pressure stabilizing tank 170 is provided on the connecting pipeline between the boosting pump 140 and the flow meter 180. The pressure stabilizing tank 170 is used to buffer the pressure fluctuation of the output of the boosting pump 140 and ensure the stability of the gas pressure entering the flow meter 180 and the compressor turbine integrated machine 500.

[0065] In this embodiment, a pressure stabilizing tank 170 is provided between the booster pump 140 and the flow meter 180 to ensure the stability of the downstream gas pressure by buffering the pressure fluctuation. This design not only improves the measurement accuracy of the flow meter 180, but also optimizes the stability and safety during the chamber pressurization process.

[0066] According to a preferred embodiment of the air pressure testing system of the present invention, it also includes multiple filters, namely: a first filter 121 arranged between the gas source cylinder 110 and the first pressure regulating device, for filtering particulate matter and impurities in the gas entering the boost pump 140; a second filter 122 arranged between the boost pump 140 and the flow meter 180, for filtering the nitrogen entering the compression turbine integrated machine chamber to prevent impurities from remaining and clogging the gap between the dynamic and static rings of the dry gas seal when the gas flows through, thereby affecting the subsequent use of the dry gas seal; a third filter 230 arranged between the operating gas cylinder 210 and the third pressure regulating device, for filtering impurities in the operating gas entering the boost pump 140.

[0067] This embodiment significantly improves the cleanliness of the gas through a multi-stage filtration solution, effectively protects the equipment, and enhances the reliability of the test results.

[0068] According to a preferred embodiment of the present invention, the inflation unit also includes a safety valve 150, which is arranged at the outlet of the boosting pump to prevent misoperation or illegal operation from causing pressure relief when the pressure behind the boosting pump is over-pressured, thereby protecting the inflation system; and also includes a one-way valve 160, which is arranged on the connecting pipeline between the boosting pump 140 and the flow meter 180 to prevent the backflow of pressurized gas, so as to avoid reducing the efficiency or failure of the boosting pump 140.

[0069] According to a specific implementation of the present embodiment, the pressure relief device includes a pressure relief valve 410 and a pressure relief pipeline. The pressure relief pipeline is connected to the target chamber and gradually releases the gas pressure in the target chamber through the pressure relief valve 410 provided thereon. The pressure relief protection unit realizes the pressure relief operation after the air pressure test is completed through the action of the pressure relief valve 410. During the air pressure test, the pressure monitoring of the second pressure gauge 191 can also be fed back to the pressure relief valve 410 to cause the action, thereby playing the role of overpressure protection.

[0070] In order to further understand the technical solution and technical effects of the present invention, the method process of the above-mentioned air pressure test system is further provided, and the specific examples are as follows:

[0071] The first step is to check the status before the air pressure test, check whether all interfaces are connected, whether the pressure gauge and flow meter 180 are within the calibration validity period, whether all equipment is in good condition, and whether the conditions for air pressure test are met.

[0072] The second step is to power on the control unit, open the control interface of the control unit host computer, check whether the PLC communication channel is unobstructed, check whether the instrument readings are correct, and test whether the control valve action response is correct.

[0073] Step 3: Input the test target pressure of 25MPa on the control interface and set the flow rate of flow meter 180 to 90L / min. Manually open the pressure reducing valve 221 on site and adjust the pressure after the pressure reducing valve 221 to 0.8MPa. Click Start Inflation on the control interface to start the air pressure test.

[0074] In the fourth step, the air pressure test system starts to inflate. The control logic of inflation is divided into three stages:

[0075] Stage 1: When inflation begins, the first pressure regulating valve 132 is slowly opened until the flow rate of the flow meter 180 reaches 90 L / min. The first pressure regulating valve 132 adjusts the opening according to the flow signal feedback of the flow meter 180 to ensure that the flow meter 180 is maintained at 90 L / min. The pressure in the chamber of the compressor-turbine integrated machine gradually increases from 0 MPa.

[0076] The second stage: as the pressure in the chamber of the compressor turbine integrated machine increases to a certain pressure, and the proportional valve control opening of the first pressure regulating valve 132 is at 70% to control the flow rate of the flow meter 180 at 90L / min, the third pressure regulating valve 223 receives the signal and responds slowly to open, and the boost pump 140 is used to increase the pressure of the chamber upstream to maintain the flow rate of the flow meter 180 at 90L / min, and as the pressure in the chamber of the compressor turbine integrated machine increases, the opening of the third regulating valve gradually increases, and the boost frequency of the boost pump 140 increases to meet the charging flow requirement.

[0077] The third stage: when the pressure in the chamber of the compression turbine integrated machine reaches 25MPa, that is, the pressure measured by the second pressure gauge 191 reaches 25MPa, the pressure signal is fed back to the second pressure regulating valve 192 to slowly open, and the chamber gas flows to the front of the boosting pump 140. The third pressure regulating valve 223 adjusts the opening according to the flow signal of the flow meter 180 to control the boosting frequency of the boosting pump 140 so that the flow of the flow meter 180 is maintained at 90L / min, and the chamber pressure is at 25MPa, forming a flow cycle.

[0078] The fifth step is to maintain the pressure in the chamber of the compressor turbine integrated machine at 25MPa and the flow meter 180 at 90L / min for 10 minutes. Check whether there is any obvious leakage sound or phenomenon on site, and use leak detection agent to spray the joints and welds of the compressor turbine integrated machine 500. If there is no problem, the leak detection is completed and the air pressure test is qualified.

[0079] Step 6: Click Stop Air Pressure Test on the control interface, and the air pressure test system will start to release pressure. The pressure release control logic is divided into three stages:

[0080] Phase 1: The pressure relief valve 410 is slowly opened, the second pressure regulating valve 192 is closed, and the third pressure regulating valve 223 adjusts the opening according to the flow signal feedback from the flow meter 180, and controls the frequency of the boost pump 140 to control the flow rate at 90 L / min.

[0081] The second stage: when the chamber pressure drops to a certain value, the third pressure regulating valve 223 is closed, and the first pressure regulating valve 132 controls the flow rate of the flow meter 180 to be maintained at 90 L / min by adjusting the opening.

[0082] Stage 3: When the chamber pressure is 1 MPa, the first pressure regulating valve 132 is closed and the flow meter 180 flow is no longer controlled until the chamber pressure is exhausted. When the pressure gauge pressure is 0, the pressure relief valve 410 is closed.

[0083] Step 7: Manually close the pressure reducing valve 221 and power off the system to end the test.

[0084] If a leak is found during the inflation process, click to stop the test and release the pressure according to the corresponding logic control. After rectification, repeat the test from the first step until the test is qualified.

[0085] This embodiment provides a gas pressure test method, which is easy to operate, has a high degree of automation, and has comprehensive protection measures, thereby improving the safety and convenience of the test operation, and also improving the efficiency of the gas pressure test of the compressor turbine integrated machine, and effectively protecting the dry gas sealing device during the pressure test.

[0086] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A pneumatic test system, characterized in that: include: The gas charging unit is used to provide high-pressure gas to the target chamber, and includes a gas source cylinder, a first pressure regulating device, a booster pump, a flow meter, and a second pressure regulating device connected in sequence, wherein: The first pressure regulating device is used to regulate the intake pressure of the booster pump; The booster pump is used to increase the gas pressure to meet the charging pressure requirement of the target chamber; The flow meter and the second pressure regulating device are used to regulate and monitor the flow rate and pressure of the gas entering the target chamber; an operating gas supply unit, comprising an operating gas cylinder and a third pressure regulating device, connected to the booster pump through a pipeline, for providing operating gas to the booster pump and controlling the boosting rate of the booster pump; The control unit, including the PLC control module and the host computer, is connected to the signals of each pressure regulating device, flow meter and booster pump to monitor the pressure and flow in real time during the test and to automatically adjust each component; The pressure relief protection unit includes a pressure relief device connected to the target chamber, which is used to release the gas pressure in the target chamber at the end of the air pressure test to ensure system safety.

2. The air pressure test system according to claim 1, characterized in that: The first pressure regulating device comprises a first pressure gauge and a first pressure regulating valve, wherein the first pressure gauge is used to monitor the pressure of the gas flowing out of the gas source cylinder, and the first pressure regulating valve is used to adjust the pressure of the gas entering the booster pump to prevent excessively high or low intake pressure from affecting the operation of the booster pump; and / or, The second pressure regulating device includes a second pressure gauge and a second pressure regulating valve, the second pressure gauge is used to monitor the gas pressure in the target chamber, and the second pressure regulating valve is used to adjust the gas flow and pressure flowing out of the target chamber to ensure that the pressure demand of the target chamber is met; and / or, The third pressure regulating device includes a pressure reducing valve, a third pressure gauge and a third pressure regulating valve. The pressure reducing valve is used to reduce the initial high pressure of the operating gas cylinder, the third pressure gauge is used to monitor the pressure of the operating gas provided to the boosting pump, and the third pressure regulating valve is used to adjust the pressure and flow of the operating gas, thereby accurately controlling the boosting rate of the boosting pump.

3. The air pressure test system according to claim 1, characterized in that: The outlet of the target chamber is connected to the air inlet pipe of the booster pump through a loop pipe to form a closed circulation structure, so that the test gas circulates between the target chamber and the booster pump.

4. The air pressure test system according to claim 1, characterized in that: A pressure stabilizing tank is provided on the connecting pipeline between the booster pump and the flow meter, and the pressure stabilizing tank is used to buffer the pressure fluctuation output by the booster pump and ensure the stability of the gas pressure entering the flow meter and the target chamber.

5. The air pressure test system according to claim 1, characterized in that: It also includes multiple filters, namely: A first filter disposed between the gas source cylinder and the first pressure regulating device, for filtering particulate matter and impurities in the gas entering the booster pump; The second filter disposed between the booster pump and the flow meter is used to further filter the gas entering the target chamber to ensure that the cleanliness of the gas meets the test requirements; The third filter arranged between the operating gas cylinder and the third pressure regulating device is used to filter impurities in the operating gas entering the booster pump.

6. The air pressure test system according to claim 1, characterized in that: The inflation unit further comprises a safety valve, which is arranged at the outlet of the booster pump and is used to release excess gas when the system pressure exceeds a set value; and / or, The inflation unit further comprises a one-way valve, which is arranged on a connecting pipeline between the booster pump and the flow meter to prevent the gas from flowing back to the booster pump.

7. The air pressure test system according to claim 1, characterized in that: The pressure relief device comprises a pressure relief valve and a pressure relief pipeline. The pressure relief pipeline is communicated with the target chamber and gradually releases the gas pressure in the target chamber through the pressure relief valve arranged thereon.

8. The air pressure test system according to any one of claims 1 to 7, characterized in that: Applied to the air pressure test of supercritical carbon dioxide Brayton cycle compression turbine integrated unit to verify the sealing performance and structural strength of the unit within the target pressure range.

9. A pneumatic test method, applicable to the pneumatic test system according to any one of claims 1 to 8, characterized in that: The following steps are involved: Inspection before air pressure test, including checking the connection of each interface, the effectiveness of pressure gauge and flow meter and the status of system equipment, to confirm that the system has the conditions for air pressure test; Set the test target parameters, including the target chamber pressure and flow value, manually adjust the pressure reducing valve to adjust the pressure after the valve to the initial value, and start the air pressure test system; Multi-stage inflation, gradually increasing the pressure of the target chamber to the set value; Maintain the target chamber pressure and flow for a period of time and complete a leak check to confirm the test results; Multi-stage pressure relief, by adjusting the pressure relief valve to gradually reduce the target chamber pressure until the pressure is emptied to complete the air pressure test.

10. The air pressure test method according to claim 9, characterized in that: The process of multi-stage inflation to gradually increase the pressure of the target chamber to a set value is specifically as follows: Phase 1: By adjusting the first pressure regulating valve to control the flow meter reading to reach the set flow rate, the target chamber pressure is gradually increased; The second stage: the booster pump starts to work, and the flow meter reading and chamber pressure stability are maintained by adjusting the opening of the third pressure regulating valve and the booster pump frequency; Stage 3: After the target chamber pressure reaches the set value, the second pressure regulating valve starts to adjust, allowing the gas to flow from the target chamber to the front of the booster pump to form a flow cycle. At the same time, the third pressure regulating valve continues to adjust according to the flow signal feedback from the flow meter to ensure the stability of the gas flow and pressure in the target chamber. and / or, The multi-stage pressure relief described above is a process of gradually reducing the target chamber pressure by adjusting the pressure relief valve until the pressure is exhausted. Specifically, the process is as follows: Phase 1: Slowly open the pressure relief valve to gradually reduce the pressure in the target chamber while controlling the flow meter flow; The second stage: when the pressure of the target chamber drops to a certain value, the booster pump is stopped, and the flow meter flow is controlled by adjusting the opening of the first pressure regulating valve; Stage 3: When the pressure in the target chamber further drops to a preset low value, the flow meter flow is no longer controlled, and the pressure relief valve is closed after the pressure in the target chamber is emptied.

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