Air supply system and method for airtight test of generator

Abstract

The invention relates to a generator airtight test air supply system which comprises a dry air generator, a connecting pipe, a standby to generator air inlet pipeline and an original hydrogen inlet pipeline, one end of the connecting pipe is connected with an air outlet of the dry air generator, and the other end of the connecting pipe is connected with one end of the standby to generator air inlet pipeline. The other end of the standby to generator gas inlet pipeline is connected with one end of the original hydrogen gas inlet pipeline, and the other end of the original hydrogen gas inlet pipeline is connected with a generator; the invention also provides a generator airtight test method by applying the system. When a 6kV power supply cannot be provided in a factory, a dry air generator matched with the volume capacity of the generator is selected, a complete air supply path is constructed through orderly connection of the dry air generator, a connecting pipe, a standby to generator air inlet pipeline and an original hydrogen inlet pipeline, and through standard operation steps, the energy consumption of the generator is reduced. Therefore, a safe and reliable airtight test is carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of generator maintenance, and in particular to a generator airtightness test air supply system and method. Background Art

[0002] During the operation of the steam turbine generator, the sealing inspection of the generator stator is of vital importance, which includes gas leak detection and air tightness test. These inspections need to be carried out during the generator handover acceptance, after overhaul and when necessary.

[0003] Currently, power plants typically use air compressors as the air source for generator air tightness tests. However, air compressors require a 6kV power supply. If all power units in a power plant are shut down and the plant cannot provide 6kV power, the air compressor cannot start and operate. Therefore, air tightness tests cannot be performed without a 6kV power supply. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a generator air tightness test air supply system and method, which ensures that the generator air tightness test is completed according to the construction schedule without affecting the normal startup of the unit.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: A generator airtight test air supply system includes: a dry air generator, a connecting pipe, a spare air intake pipe to the generator and an original hydrogen intake pipe, one end of the connecting pipe is connected to the air outlet of the dry air generator, the other end of the connecting pipe is connected to one end of the spare air intake pipe to the generator, the other end of the spare air intake pipe to the generator is connected to one end of the original hydrogen intake pipe, and the other end of the original hydrogen intake pipe is connected to the generator.

[0006] The present invention has the following beneficial effects: when a 6kV power supply is unavailable within the factory, a dry air generator compatible with the generator's volume and capacity is selected, and the dry air generator is connected to a backup air intake line to the generator via a connecting pipe. By sequentially connecting the dry air generator, the connecting pipe, the backup air intake line to the generator, and the original hydrogen intake line, a complete air supply path is established. The dry air generator generates dry compressed air, which prevents erosion of the generator's internal components by moist air, and prevents problems such as rust and short circuits caused by moisture. This ensures the dryness and purity of the gas during the airtightness test, thereby enabling more accurate testing of the generator's airtightness performance. Furthermore, by connecting the existing original hydrogen intake line, the airtightness test air supply function is achieved without disrupting the generator's original gas supply structure, reducing system modification costs and construction difficulty.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, it also includes a pipeline section and a first adapter, the first adapter is a tee joint, the first end of the tee joint is connected to one end of the original hydrogen intake pipe, the second end of the tee joint is connected to one end of the pipeline section, and the third end of the tee joint is connected to the other end of the backup to generator intake pipe.

[0009] The beneficial effects of adopting the above-mentioned further solution are: flexible diversion of the gas pipeline is achieved by setting a three-way joint. When conducting an airtightness test, the gas can be distributed to different paths according to actual needs, which facilitates separate testing of various parts of the system; at the same time, the setting of one section of the pipeline provides installation space for the subsequent addition of other functional components, thereby enhancing the scalability and functionality of the system.

[0010] Furthermore, a sewage valve is provided at the other end of the pipeline section.

[0011] The beneficial effect of adopting the above-mentioned further scheme is: by setting a drain valve at the other end of one section of the pipeline, impurities, oil stains, accumulated water and other substances remaining in the pipeline can be discharged in time before the air tightness test, so as to prevent these impurities from entering the generator and preventing pollution and damage to the generator, thereby ensuring the cleanliness of the test environment and ensuring the quality of the gas entering the generator, making the air tightness test results more accurate and reliable.

[0012] Furthermore, a first branch pipeline is provided on the first section of the pipeline, and a sampling valve is provided on the first branch pipeline.

[0013] The beneficial effect of adopting the above further scheme is: by setting a sampling valve on the first branch pipeline, it is convenient to sample and test the compressed air before the air tightness test, so as to judge the dryness of the gas, ensure that the gas used for the air tightness test meets the requirements, and avoid the test results being affected by gas moisture.

[0014] Furthermore, it also includes a hygrometer and a first pressure gauge arranged on the connecting pipe at the air outlet of the dry air generator.

[0015] The beneficial effect of adopting the above-mentioned further solution is that by setting up a hygrometer and a first pressure gauge, the humidity and pressure parameters of the output gas can be monitored in real time. The operator can intuitively obtain the key indicators of the gas and adjust the working parameters of the dry air generator in time to ensure that the dryness and pressure of the output gas are stable within an appropriate range, thereby improving the safety and reliability of the airtightness test.

[0016] Furthermore, it also includes multiple oil-water detectors arranged at the bottom of the generator, one end of the multiple oil-water detectors is connected to the casing at the bottom of the generator, and the other end of the multiple oil-water detectors is provided with a detector drain valve.

[0017] The beneficial effect of adopting this further solution is that multiple oil and water detectors and a drain valve are installed at the bottom of the generator to monitor in real time whether there is any oil or water accumulation inside the generator. During the airtightness test, if the oil and water detectors indicate an error or the drain valve discharges oil or water, it can be determined that there is a sealing problem or other fault inside the generator. Inflation can be stopped and corrected immediately. After the fault is corrected, the airtightness test can be carried out again, ensuring the safety of the airtightness test.

[0018] Furthermore, a second branch pipeline is provided on the raw hydrogen inlet pipeline, a pressure transmitter and a monitoring system are provided on the second branch pipeline, and the monitoring system is communicatively connected to the pressure transmitter.

[0019] The beneficial effects of adopting the above-mentioned further scheme are: by setting up a second branch pipeline and installing a pressure transmitter and a monitoring system, and the monitoring system is communicatively connected to the pressure transmitter, the pressure transmitter can accurately measure the internal pressure of the generator in real time and transmit the data to the monitoring system. The operator can remotely and in real time grasp the pressure changes in the generator through the monitoring system; during the airtightness test, abnormal pressure fluctuations can be discovered in time, and it can be determined whether there is a leak point, thereby improving the level of automated monitoring of the test and the timeliness of fault diagnosis.

[0020] Furthermore, it also includes a control valve group, which includes a first valve arranged on the connecting pipe at the air outlet of the dry air generator, a second valve arranged on the spare air intake pipe to the generator, a third valve arranged on the original hydrogen intake pipe and a fourth valve arranged on the second branch pipe.

[0021] The beneficial effect of adopting the above further scheme is: by setting the first valve, the second valve, the third valve and the fourth valve, accurate control of the gas flow and on-off of each pipeline of the gas supply system is achieved, ensuring that the airtightness test is carried out safely and smoothly.

[0022] The present invention also provides a generator air tightness test method, which is implemented using the above-mentioned generator air tightness test air supply system, including: starting the dry air generator, filling compressed air into the connecting pipe, the spare air intake pipe to the generator, the original hydrogen intake pipe and the generator, and detecting whether there are leaks in the spare air intake pipe to the generator, the original hydrogen intake pipe and the generator.

[0023] Furthermore, the generator airtightness test method specifically includes the following steps:

[0024] S1. Purge and clean the connecting pipe, connect the air outlet of the dry air generator to one end of the connecting pipe, and connect the other end of the connecting pipe to one end of the original hydrogen inlet pipe;

[0025] S2. Start the dry air generator, open the first valve, the second valve, and the drain valve, adjust the opening of the first valve so that the outlet pressure of the dry air generator is 0.3 MPa, drain the air from the standby air intake line to the generator, and close the drain valve after draining.

[0026] S3. Open the sampling valve and use a handheld dew point meter to detect the dew point temperature of the compressed air from the end of the first branch pipeline. Adjust the operating parameters of the dry air generator, that is, control the AB adsorption towers of the dry air generator to alternately switch through the PLC for automatically controlling the dry air generator, so that the currently working adsorption tower (such as tower A) continues to adsorb moisture within the set time, ensuring that the dew point temperature of the outlet compressed air of the dry air generator is less than or equal to -50°C. After the set time is reached, the PLC automatically switches to another adsorption tower (such as tower B) to work, and the exiting adsorption tower (tower A) performs heating desorption and cooling regeneration in sequence according to the preset program to prepare for the next cycle; by alternating operation and regeneration of the AB adsorption towers, ensure that the dew point of the compressed air continues to meet the standard, so as to ensure that the maximum dew point temperature of the compressed air is less than or equal to -50°C. After the compressed air dew point is detected to be stable and meet the standard, close the sampling valve;

[0027] S4. Open the third valve and the fourth valve to charge the original hydrogen inlet pipeline and the second branch pipeline, adjust the opening of the first valve and the second valve to control the air intake rate below 0.1 MPa / h, start the sealing oil system of the generator to ensure that the oil-gas pressure difference is 52±20% kPa, and record the dry air generator outlet pressure, humidity value and the generator internal pressure once every hour;

[0028] S5. During the inflation process, check whether the indicator window of the oil-water detector indicates an alarm, and check whether there is oil or water in the drain valve. If the indicator window of the oil-water detector indicates an alarm or the drain valve indicates oil or water, stop inflation and take appropriate measures. If the indicator window of the oil-water detector does not indicate an alarm and the drain valve does not indicate oil or water, continue with subsequent operations.

[0029] S6. Find and fix the leak when the pressure inside the generator is 0.05 MPa, 0.1 MPa, 0.2 MPa and 0.3 MPa, respectively;

[0030] S7. Finally, fill the connecting pipe, the standby air inlet line to the generator, the original hydrogen air inlet line, and the generator with compressed air to a pressure of 0.3 MPa, close the first valve and the second valve, and stop charging. During the pressure maintenance process, observe the pressure drop rate in the generator monitored by the monitoring system to determine whether there are any leaks in the standby air inlet line to the generator, the original hydrogen air inlet line, and the generator.

[0031] The beneficial effects of adopting the above-mentioned further solution are: through the specific steps of the airtightness test, namely, from the purging and cleaning of the connecting pipes, pipeline drainage, gas humidity detection, inflation process control, leak detection and pressure monitoring, etc., the airtightness test process is fully standardized. Each step has clear operating requirements and parameter indicators, making the airtightness test process more standardized and normalized, reducing the risk of inaccurate test results or equipment damage due to improper operation; finding leaks at different pressure stages can comprehensively and accurately detect leaks in the generator and piping system, improving the accuracy and reliability of the test; at the same time, the pressure drop rate is monitored by the monitoring system during the pressure maintenance process, providing a scientific basis for judging the airtightness performance of the generator, facilitating the timely detection of problems and the implementation of appropriate measures to repair them.

[0032] The generator airtightness test gas supply system and method of the present invention can be carried out even when a 6kV power supply cannot be provided in the factory. That is, the test can be carried out by connecting the dry air generator to the original air supply pipeline structure through a connecting pipe. The power supply is convenient to connect, the operation is simple, and the airtightness test steps are standardized, which ensures the safety and stability of the airtightness test, ensures the smooth completion of the airtightness test and improves the efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the air supply system for the generator air tightness test of the present invention.

[0034] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0035] 1. Dry air generator; 2. Connecting pipe; 3. Spare air inlet line to generator; 4. Raw hydrogen inlet line; 5. Generator; 6. Pipeline section 1; 7. Second branch line; 8. Drain valve; 9. First branch line; 10. Sampling valve; 11. First valve; 12. Second valve; 13. Third valve; 14. Fourth valve; 15. Pressure transmitter; 16. Monitoring system. DETAILED DESCRIPTION

[0036] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] Example 1

[0038] like Figure 1As shown, this embodiment provides a generator airtightness test air supply system, including: a dry air generator 1, a connecting pipe 2, a spare air inlet pipeline to the generator 3 and an original hydrogen inlet pipeline 4, one end of the connecting pipe 2 is connected to the air outlet of the dry air generator 1, the other end of the connecting pipe 2 is connected to one end of the spare air inlet pipeline to the generator 3, the other end of the spare air inlet pipeline to the generator 3 is connected to one end of the original hydrogen inlet pipeline 4, and the other end of the original hydrogen inlet pipeline 4 is connected to the generator 5.

[0039] When a 6kV power supply is unavailable within the factory, a dry air generator 1, compatible with the volume and capacity of generator 5, is selected. This is then connected to the backup air intake line 3 to the generator via a connecting pipe 2. The orderly connection of dry air generator 1, connecting pipe 2, backup air intake line 3 to the generator, and the original hydrogen inlet pipe 4 establishes a complete air supply path. The dry air generator 1 generates dry compressed air, preventing humid air from corroding the internal components of generator 5 and preventing problems such as rust and short circuits caused by moisture. This ensures the dryness and purity of the gas during the airtightness test, enabling more accurate testing of the airtightness performance of generator 5. Furthermore, the connection is made based on the existing original hydrogen inlet pipe 4, enabling the airtightness test air supply function to be realized without disrupting the original gas supply structure of generator 5, reducing the cost and difficulty of system modification.

[0040] Specifically, the connecting pipe 2 is a rubber hose.

[0041] In a specific example, the air outlet of the dry air generator 1 and one end of the spare air inlet pipe 3 to the generator are first wrapped with PVC tape, and then the two ends of a Φ33mm high-strength rubber hose are respectively inserted into the air outlet end of the dry air generator 1 and one end of the spare air inlet pipe 3 to the generator, and the insertion length is greater than or equal to 100mm, and two hose clamp joints are used to securely fix it.

[0042] Based on any of the above schemes, it also includes a pipeline section 6 and a first adapter, the first adapter is a tee connector, the first end of the tee connector is connected to one end of the original hydrogen intake pipe 4, the second end of the tee connector is connected to one end of the pipeline section 6, and the third end of the tee connector is connected to the other end of the backup to generator intake pipe 3.

[0043] By setting up a three-way joint, flexible diversion of the gas pipeline is achieved. During the airtightness test, the gas can be distributed to different paths according to actual needs, which facilitates the separate testing of each part of the system. At the same time, the setting of pipeline section 6 provides installation space for the subsequent addition of other functional components, enhancing the scalability and functionality of the system.

[0044] On the basis of any of the above solutions, a sewage valve 8 is provided at the other end of the pipeline section 6 .

[0045] By providing a drain valve 8 at the other end of the pipeline section 6, impurities, oil stains, accumulated water and other substances remaining in the pipeline can be discharged in time before the air tightness test, so as to prevent these impurities from entering the interior of the generator 5, thereby preventing pollution and damage to the generator 5, ensuring the cleanliness of the test environment, and at the same time ensuring the quality of the gas entering the generator 5, making the air tightness test results more accurate and reliable.

[0046] On the basis of any of the above solutions, a first branch pipeline 9 is further provided on the pipeline section 6 , and a sampling valve 10 is provided on the first branch pipeline 9 .

[0047] By setting a sampling valve 10 on the first branch pipeline 9, it is convenient to sample and test the compressed air before the air tightness test, so as to judge the dryness of the gas, ensure that the gas used for the air tightness test meets the requirements, and avoid affecting the test results due to gas moisture.

[0048] On the basis of any of the above solutions, it further includes a hygrometer and a first pressure gauge arranged on the connecting pipe 2 at the air outlet of the dry air generator 1.

[0049] By setting up a hygrometer and a first pressure gauge, the humidity and pressure parameters of the output gas can be monitored in real time. The operator can intuitively obtain the key indicators of the gas and adjust the working parameters of the dry air generator 1 in time to ensure that the dryness and pressure of the output gas are stable within an appropriate range, thereby improving the safety and reliability of the airtightness test.

[0050] Based on any of the above schemes, it also includes multiple oil-water detectors arranged at the bottom of the generator 5, one end of the multiple oil-water detectors is connected to the casing at the bottom of the generator 5, and the other end of the multiple oil-water detectors is provided with a detector drain valve.

[0051] Specifically, the detector drain valve is connected to the drain tank through another connecting pipe.

[0052] Multiple oil and water detectors and a drain valve are installed at the bottom of generator 5 to monitor in real time whether there is any oil or water accumulation inside generator 5. During the airtightness test, if the oil and water detectors indicate an error or the drain valve discharges oil or water, it is determined that there is a sealing problem or other fault inside generator 5. Inflation is stopped and corrected immediately. After the fault is corrected, the airtightness test can be carried out again to ensure the safety of the airtightness test.

[0053] On the basis of any of the above solutions, a second branch pipeline 7 is further provided on the original hydrogen inlet pipeline 4 , and a pressure transmitter 15 and a monitoring system 16 are provided on the second branch pipeline 7 . The monitoring system 16 and the pressure transmitter 15 are communicatively connected.

[0054] By setting up a second branch pipeline 7 and installing a pressure transmitter 15 and a monitoring system 16, and the monitoring system 16 is communicatively connected to the pressure transmitter 15, the pressure transmitter 15 can accurately measure the internal pressure of the generator 5 in real time and transmit the data to the monitoring system 16. The operator can remotely and in real time grasp the pressure changes in the generator 5 through the monitoring system 16; during the airtightness test, abnormal pressure fluctuations can be discovered in time and it can be determined whether there is a leak point, thereby improving the level of automated monitoring of the test and the timeliness of fault diagnosis.

[0055] On the basis of any of the above schemes, it also includes a control valve group, which includes a first valve 11 arranged on the connecting pipe 2 at the air outlet of the dry air generator 1, a second valve 12 arranged on the backup to generator air intake pipe 3, a third valve 13 arranged on the original hydrogen air intake pipe 4 and a fourth valve 14 arranged on the second branch pipe 7.

[0056] By providing the first valve 11, the second valve 12, the third valve 13 and the fourth valve 14, precise control of the gas flow and on-off of each pipeline of the gas supply system is achieved, ensuring that the airtightness test is carried out safely and smoothly.

[0057] Example 2

[0058] This embodiment also provides a generator air tightness test method, which is implemented using the generator air tightness test air supply system of Example 1, including: starting the dry air generator 1, filling compressed air into the connecting pipe 2, the spare air intake pipe to the generator 3, the original hydrogen intake pipe 4 and the generator 5, and detecting whether there are leaks in the spare air intake pipe to the generator 3, the original hydrogen intake pipe 4 and the generator 5.

[0059] Specifically, the test conditions for the generator air tightness test method are: the generator is in a stationary or cranking state; the sealing oil system operates normally; the generator hydrogen cooler is not in operation, and the hydrogen cooler air exhaust valve is open; the generator fixed cooling water is not in operation, and the fixed cooling water drain valve is open.

[0060] Based on any of the above solutions, the generator airtightness test method specifically includes the following steps:

[0061] S1. Purge and clean the connecting pipe 2, connect the air outlet of the dry air generator 1 to one end of the connecting pipe 2, and connect the other end of the connecting pipe 2 to one end of the original hydrogen inlet pipe 4;

[0062] S2. Start the dry air generator 1, open the first valve 11, the second valve 12, and the drain valve 8, adjust the opening of the first valve 11 so that the outlet pressure of the dry air generator 1 is 0.3 MPa, drain the standby to generator air intake pipe 3, and close the drain valve 8 after draining.

[0063] S3. Open the sampling valve 10 and use a handheld dew point meter to detect the dew point temperature of the compressed air from the end of the first branch pipeline 9. Adjust the operating parameters of the dry air generator 1, that is, control the AB adsorption towers of the dry air generator 1 to alternately switch through the PLC for automatically controlling the dry air generator 1, so that the currently working adsorption tower (such as tower A) continuously adsorbs moisture within the set time to ensure that the dew point temperature of the compressed air at the outlet of the dry air generator 1 is less than or equal to -50°C. After the set time is reached, the PLC automatically switches to another adsorption tower (such as tower B) to work, and the exiting adsorption tower (tower A) performs heating desorption and cooling regeneration in sequence according to the preset program to prepare for the next cycle; by alternating operation and regeneration of the AB adsorption towers, ensure that the dew point of the compressed air continues to meet the standard, so as to ensure that the maximum dew point temperature of the compressed air is less than or equal to -50°C. After the dew point of the compressed air is detected to be stable and meet the standard, close the sampling valve 10;

[0064] S4. Open the third valve 13 and the fourth valve 14 to inflate the original hydrogen inlet pipe 4 and the second branch pipe 7. Adjust the openings of the first valve 11 and the second valve 12 to control the air intake rate below 0.1 MPa / h. Start the sealing oil system of the generator 5 to ensure that the oil-gas pressure difference is 52±20% kPa. Record the outlet pressure and humidity of the dry air generator 1 and the pressure inside the generator 5 every hour.

[0065] S5. During the inflation process, check whether the indicator window of the oil-water detector shows an alarm (when the oil-water detector detects that the water content in the oil exceeds the standard or there is an abnormal oil-water mixture, the indicator window will show a corresponding alarm to remind the staff to take appropriate measures to avoid the generator 5 malfunction caused by the oil-water problem). Check whether there is oil or water in the drain valve. If the indicator window of the oil-water detector shows an alarm or the drain valve has oil or water, stop inflation and take appropriate measures. If the indicator window of the oil-water detector does not show an alarm, the drain valve has no oil or water, and continue with subsequent operations.

[0066] S6, finding and treating the leak when the pressure inside the generator 5 is 0.05 MPa, 0.1 MPa, 0.2 MPa and 0.3 MPa respectively;

[0067] S7. Finally, compressed air is charged into the connecting pipe 2, the standby air inlet line to the generator 3, the original hydrogen air inlet pipe 4 and the generator 5 to a pressure of 0.3 MPa, and the first valve 11 and the second valve 12 are closed to stop charging. During the pressure maintenance process, the pressure drop rate in the generator 5 monitored by the monitoring system 16 is observed to determine whether there is a leak in the standby air inlet line to the generator 3, the original hydrogen air inlet pipe 4 and the generator 5.

[0068] The beneficial effects of adopting the above-mentioned further solution are as follows: The specific steps of the airtightness test, namely, purging and cleaning the connecting pipe 2, draining the pipeline, gas humidity detection, inflation process control, leak detection, and pressure monitoring, are comprehensively standardized. Each step has clear operating requirements and parameter indicators, making the airtightness test process more standardized and normalized, reducing the risk of inaccurate test results or equipment damage due to improper operation; finding leaks at different pressure stages can comprehensively and accurately detect leaks in the generator 5 and the pipeline system, improving the accuracy and reliability of the test; at the same time, monitoring the pressure drop rate through the monitoring system 16 during the pressure maintenance process provides a scientific basis for judging the airtightness performance of the generator 5, facilitating the timely detection of problems and the implementation of appropriate measures to repair them.

[0069] Specifically, the power supply voltage of the dry air generator 1 is 380V, the power is 18kW, the working pressure is 0-0.8MPa, the dew point is less than or equal to -40℃, and the flow rate is 120m 3 / h.

[0070] Specifically, the monitoring system 16 is a DCS system (Distributed Control System) or a SIS system (Safety Instrumented System).

[0071] Specifically, in step S6, when the pressure inside the generator 5 is 0.05MPa, 0.1MPa, 0.2MPa and 0.3MPa respectively, all sealing points of the generator 5 and the pipeline (including but not limited to the manhole of the main body, end cover, pipeline flange, valve, etc.) are checked for leaks. Only after confirming that there is no leakage and inflating to the rated pressure can the corresponding valve be closed and the dry air generator 1 be stopped, and the state of maintaining pressure and monitoring can be entered.

[0072] In one specific example, the connecting pipe 2 is heated by the ambient temperature to prevent condensation in the standby to generator air intake pipe 3 and to ensure that the temperature of the section of the compressed air filling the standby to generator air intake pipe 3 does not change drastically, so as to ensure that the gas filled into the entire pipeline system meets the requirements and to ensure that the airtightness test is carried out safely and smoothly.

[0073] The generator airtightness test gas supply system and method of the present invention can be carried out even when a 6kV power supply cannot be provided in the factory. That is, the test can be carried out by connecting the dry air generator 1 to the original air supply pipeline structure through the connecting pipe 2. The power supply is convenient to connect, the operation is simple, the airtightness test steps are standardized, the safety and stability of the airtightness test are guaranteed, and the smooth completion of the airtightness test is guaranteed while improving the efficiency.

[0074] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0076] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0077] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0078] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0079] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A generator air tightness test air supply system, characterized in that: include: A dry air generator (1), a connecting pipe (2), a standby air inlet pipeline to a generator (3), and an original hydrogen air inlet pipeline (4), wherein one end of the connecting pipe (2) is connected to the air outlet of the dry air generator (1), the other end of the connecting pipe (2) is connected to one end of the standby air inlet pipeline to the generator (3), the other end of the standby air inlet pipeline to the generator (3) is connected to one end of the original hydrogen air inlet pipeline (4), and the other end of the original hydrogen air inlet pipeline (4) is connected to the generator (5).

2. A generator airtightness test air supply system according to claim 1, characterized in that: The utility model also comprises a pipeline section (6) and a first adapter, wherein the first adapter is a three-way adapter, wherein a first end of the three-way adapter is connected to one end of the original hydrogen inlet pipeline (4), a second end of the three-way adapter is connected to one end of the pipeline section (6), and a third end of the three-way adapter is connected to the other end of the standby to generator inlet pipeline (3).

3. A generator airtightness test air supply system according to claim 2, characterized in that: The other end of the pipeline section (6) is provided with a sewage discharge valve (8).

4. The generator airtightness test air supply system according to claim 2, characterized in that: A first branch pipeline (9) is also provided on the pipeline section (6), and a sampling valve (10) is provided on the first branch pipeline (9).

5. The generator airtightness test air supply system according to claim 1, characterized in that: It also includes a hygrometer and a first pressure gauge arranged on the connecting pipe (2) at the air outlet of the dry air generator (1).

6. The generator airtightness test air supply system according to claim 1, characterized in that: It also includes a plurality of oil-water detectors arranged at the bottom of the generator (5), one end of each of the plurality of oil-water detectors is connected to the casing at the bottom of the generator (5), and the other end of each of the plurality of oil-water detectors is provided with a detector drain valve.

7. The generator airtightness test air supply system according to claim 1, characterized in that: A second branch pipeline (7) is further provided on the raw hydrogen inlet pipeline (4), and a pressure transmitter (15) and a monitoring system (16) are provided on the second branch pipeline (7), wherein the monitoring system (16) and the pressure transmitter (15) are communicatively connected.

8. The generator airtightness test air supply system according to claim 7, characterized in that: The invention also includes a control valve group, which includes a first valve (11) provided on the connecting pipe (2) at the air outlet of the dry air generator (1), a second valve (12) provided on the standby air inlet pipeline (3) to the generator, a third valve (13) provided on the raw hydrogen air inlet pipeline (4), and a fourth valve (14) provided on the second branch pipeline (7).

9. A generator airtightness test method, characterized in that: The generator airtightness test air supply system according to any one of claims 1 to 8 is implemented, comprising: starting the dry air generator (1), filling compressed air into the connecting pipe (2), the standby air intake line to the generator (3), the original hydrogen air intake pipe (4) and the generator (5), and detecting whether there are leaks in the standby air intake line to the generator (3), the original hydrogen air intake pipe (4) and the generator (5).

10. A generator airtightness test method according to claim 9, characterized in that: The specific steps include: S1. Purging and cleaning the connecting pipe (2), connecting the air outlet of the dry air generator (1) to one end of the connecting pipe (2), and connecting the other end of the connecting pipe (2) to one end of the original hydrogen inlet pipe (4); S2, starting the dry air generator (1), and opening the first valve (11), the second valve (12) and the drain valve (8), adjusting the opening of the first valve (11) so that the outlet pressure of the dry air generator (1) is 0.3 MPa, draining the standby to generator air intake pipeline (3), and closing the drain valve (8) after draining; S3, opening the sampling valve (10), using a handheld dew point meter to detect the dew point temperature of the compressed air from the end of the first branch pipe (9), adjusting and controlling the parameters of the dry air generator (1) to ensure that the maximum dew point temperature of the compressed air is less than or equal to -50°C, and closing the sampling valve (10); S4, opening the third valve (13) and the fourth valve (14), charging the original hydrogen inlet pipe (4) and the second branch pipe (7), adjusting the opening of the first valve (11) and the second valve (12), controlling the air intake rate to be below 0.1 MPa / h, starting the sealing oil system of the generator (5), ensuring that the oil-gas pressure difference is 52±20% kPa, and recording the outlet pressure and humidity value of the dry air generator (1) and the internal pressure of the generator (5) once every hour; S5. During the inflation process, check whether the indicator window of the oil-water detector indicates an alarm, and check whether there is oil or water in the drain valve. If the indicator window of the oil-water detector indicates an alarm or the drain valve indicates oil or water, stop inflation and take appropriate measures. If the indicator window of the oil-water detector does not indicate an alarm and the drain valve does not indicate oil or water, continue with subsequent operations. S6, finding and treating the leak point when the pressure inside the generator (5) is 0.05 MPa, 0.1 MPa, 0.2 MPa and 0.3 MPa in sequence; S7. Finally, compressed air is charged into the connecting pipe (2), the standby air inlet pipe to the generator (3), the original hydrogen air inlet pipe (4) and the generator (5) to a pressure of 0.3 MPa, and the first valve (11) and the second valve (12) are closed to stop charging; during the pressure maintenance process, the pressure drop rate in the generator (5) monitored by the monitoring system (16) is observed to determine whether there is a leak in the standby air inlet pipe to the generator (3), the original hydrogen air inlet pipe (4) and the generator (5).

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