CN217468507U

CN217468507U - Hydrogen circulating pump and ejector performance test system

Info

Publication number: CN217468507U
Application number: CN202221090089.1U
Authority: CN
Inventors: 唐陈; 贺雪强; 段威林; 甘露; 安彩云
Original assignee: Cssc Southwest Equipment Research Institute Co ltd
Current assignee: Cssc Southwest Equipment Research Institute Co ltd
Priority date: 2022-05-09
Filing date: 2022-05-09
Publication date: 2022-09-20
Anticipated expiration: 2032-05-09

Abstract

The utility model discloses a performance test system for a hydrogen circulating pump and an ejector, which comprises a gas supply unit, a working condition control unit, a measurement and acquisition unit, an ejector and a hydrogen circulating pump; the gas supply unit is connected with the working condition control unit, the working condition control unit is connected with the high-pressure gas inlet pipeline, the low-pressure gas inlet pipeline and the hydrogen pump gas inlet pipeline through the opening adjusting valve, the high-pressure gas inlet pipeline, the low-pressure gas inlet pipeline and the hydrogen pump gas inlet pipeline are respectively connected with the high-pressure inlet, the low-pressure inlet and the hydrogen pump inlet of the ejector, the ejector gas exhaust pipeline of the ejector and the hydrogen pump gas exhaust pipeline of the hydrogen pump are connected with the gas exhaust buffer tank, the gas exhaust buffer tank is connected with the main loop through the gas exhaust pipeline, and the main loop is externally connected with the main air release pipeline; the measurement and acquisition unit is connected with the high-pressure air inlet pipeline, the low-pressure air inlet pipeline, the hydrogen pump air inlet pipeline, the ejector exhaust pipeline and the hydrogen pump exhaust pipeline. Has the effects of reducing cost, saving resources and protecting environment.

Description

Hydrogen circulating pump and ejector performance test system

Technical Field

The utility model relates to a fuel cell technical field especially relates to a hydrogen circulating pump and ejector capability test system.

Background

The hydrogen fuel cell can meet the application requirements in the fields of transportation, fixed power supply and the like by virtue of the advantages of cleanness, low working temperature, quick start, high specific power and the like, and is developed into a mainstream technical route of the fuel cell at home and abroad.

As an important component of a hydrogen supply system of a hydrogen fuel cell, a hydrogen circulation system is used for pressurizing unreacted hydrogen from an outlet of a galvanic pile, conveying the pressurized unreacted hydrogen back to an inlet of the galvanic pile, merging with inlet reaction gas and then entering the galvanic pile. On one hand, the hydrogen circulation system brings part of water in the reaction gas tail gas into the galvanic pile to play a role of humidification; on the other hand, the flow velocity of hydrogen in the anode flow channel of the fuel cell is improved, and anode flooding is avoided; meanwhile, the purpose of improving the utilization rate of the hydrogen is achieved. The hydrogen circulating pump is simple to control, wide in flow regulation range and capable of quickly regulating flow, and can meet different working condition parameter requirements and quick response requirements of the galvanic pile. The ejector has the advantages of simple structure, small volume, no parasitic power consumption and the like, but the working range of the ejector is limited. The performance of the hydrogen circulating pump and the ejector directly influences the working performance of the fuel cell stack, and if the performance of the hydrogen circulating pump and the ejector is to be accurately mastered, the performance curve can be obtained only through tests, so that reference is provided for the type selection of a hydrogen supply system of the galvanic pile.

At present, a performance test system of a hydrogen circulating pump and an ejector is constructed basically and separately, investment and repeated construction are increased, various actual operation working conditions of the hydrogen circulating pump cannot be simulated accurately, particularly, complex inlet working conditions of mixed gas of hydrogen, nitrogen and water vapor at different temperatures and pressures are difficult to realize, so that performance parameters of the hydrogen circulating pump and the ejector which pass test tests have certain difference with actual requirements of a fuel cell, and the performance test system is difficult to reasonably match after the fuel cell is assembled to realize efficient and stable operation of the whole machine. Therefore, it is necessary to develop a system having a function of testing the performance of the hydrogen circulation pump and the ejector and perform a test of the hydrogen circulation pump and the ejector.

SUMMERY OF THE UTILITY MODEL

To the not enough of above-mentioned prior art, the technical problem that this patent application will solve provides a hydrogen circulating pump and ejector capability test system, can judge the performance state of survey hydrogen circulating pump and ejector, provides the test data support for the design and the optimization of hydrogen circulating pump and ejector, provides the basis for the lectotype of hydrogen supply system.

In order to solve the technical problem, the utility model discloses a following technical scheme:

a performance test system for a hydrogen circulating pump and an ejector comprises a gas supply unit, a working condition control unit, a measuring and collecting unit, an ejector and a hydrogen circulating pump;

the gas supply unit comprises a hydrogen supply unit and a nitrogen supply unit;

the hydrogen supply unit and the nitrogen supply unit are connected with the working condition control unit, the working condition control unit is connected with the high-pressure air inlet pipeline, the low-pressure air inlet pipeline and the hydrogen pump air inlet pipeline through opening adjusting valves, the high-pressure air inlet pipeline, the low-pressure air inlet pipeline and the hydrogen pump air inlet pipeline are respectively connected with the high-pressure inlet, the low-pressure inlet and the hydrogen pump inlet of the ejector, the ejector exhaust pipeline of the ejector and the hydrogen pump exhaust pipeline of the hydrogen pump are connected with an exhaust buffer tank, ball valves are respectively arranged on the ejector exhaust pipeline and the hydrogen pump exhaust pipeline, the exhaust buffer tank is connected with a main loop through the exhaust pipeline, the main loop is externally connected with a main exhaust pipeline, and the exhaust pipeline is connected with the main exhaust pipeline and is provided with a ball valve; the main loop is provided with a gas component detection unit;

the measurement and acquisition unit is connected with the high-pressure air inlet pipeline, the low-pressure air inlet pipeline, the hydrogen pump air inlet pipeline, the ejector exhaust pipeline and the hydrogen pump exhaust pipeline; the hydrogen pump exhaust pipeline is connected with the exhaust pipeline through a gas detection pipeline, two ball valves and a gas oil content detector are installed on the gas detection pipeline, and the gas oil content detector is located between the two ball valves.

The hydrogen supply unit comprises a hydrogen cylinder, a first pressure reducing valve group and a first ball valve which are connected through a hydrogen inlet pipeline; the nitrogen supply unit comprises a nitrogen bottle, a second pressure reducing valve group and a second ball valve which are connected through a nitrogen inlet pipeline; the hydrogen inlet pipeline and the nitrogen inlet pipeline are converged to form an inlet pipeline; still include the first bypass of being connected with nitrogen gas supply unit, be provided with first governing valve on the first bypass, first governing valve is located between second decompression valves and the second ball valve, air inlet pipe way and first bypass are connected with the major loop, and are provided with the aperture governing valve between air inlet pipe way and the first bypass.

The measuring and collecting unit comprises a temperature sensor and a pressure sensor which are arranged on a high-pressure air inlet pipeline, a low-pressure air inlet pipeline, a hydrogen pump air inlet pipeline, an ejector exhaust pipeline and a hydrogen pump exhaust pipeline, humidity sensors which are arranged on the low-pressure air inlet pipeline and the hydrogen pump air inlet pipeline, and flow sensors which are arranged on the high-pressure air inlet pipeline, the low-pressure air inlet pipeline and the hydrogen pump air inlet pipeline.

The working condition control unit comprises an air pressure control unit and a temperature and humidity control unit;

the air pressure control unit comprises a high-pressure air inlet buffer tank and a low-pressure air inlet buffer tank, air inlets of the high-pressure air inlet pipe flushing tank and the low-pressure air inlet buffer tank are respectively connected with a main loop, a ball valve is arranged on the main loop, an outlet of the high-pressure air inlet buffer tank is connected with a high-pressure air inlet pipeline, an outlet of the low-pressure air inlet buffer tank is connected with a low-pressure air inlet pipeline of an ejector and a hydrogen pump air inlet pipeline, and opening adjusting valves are arranged between the outlet of the high-pressure air inlet buffer tank and the outlet of the low-pressure air inlet buffer tank and at the outlet of the low-pressure air inlet buffer tank;

the temperature and humidity control unit comprises a heating and humidifying module and a gas-liquid separator, the heating and humidifying module is connected with the low-pressure air inlet buffer tank and is provided with a ball valve, the heating and humidifying module is connected with the gas-liquid separator, the gas-liquid separator is connected with an outlet of the low-pressure air inlet buffer tank through a second regulating valve and further comprises a second bypass, and a third regulating valve is installed on the second bypass and the outlet of the heating and humidifying module and the gas-liquid separator and the second bypass.

The high-pressure air inlet buffer tank, the low-pressure air inlet buffer tank, the heating and humidifying module, the gas-liquid separator and the exhaust buffer tank are all connected with a liquid discharge pipeline outwards, and ball valves are mounted on the liquid discharge pipeline.

The gas composition detection unit comprises a gas composition detector, the inlet and the outlet of the gas composition detector are connected with a third ball valve and a fourth ball valve, a fifth ball valve is arranged between the third ball valve and the fourth ball valve, the fifth ball valve is connected with a main emptying pipeline, the inlet of the gas composition detector is connected with a low-pressure air inlet pipeline and a hydrogen pump air inlet pipeline through a detection pipeline, and a sixth ball valve is installed on the detection pipeline.

The hydrogen gas inlet pipeline comprises a hydrogen gas inlet pipeline, a hydrogen gas outlet pipeline and a hydrogen gas outlet pipeline, wherein the hydrogen gas inlet pipeline comprises a hydrogen gas inlet pipeline and a hydrogen gas outlet pipeline, and the hydrogen gas inlet pipeline is arranged on the hydrogen gas inlet pipeline and is connected with the hydrogen gas inlet pipeline through a first pressure reducing valve group; the fire arrestor and the check valve are installed on a main emptying pipeline, the safety valve is installed on a main loop, the test system is grounded through a cable under the ground protection, the combustible gas detector is placed in a laboratory where the test system is located, and the combustible gas detector is connected with the audible-visual alarm, the electromagnetic valve and the electrical control system.

And the hydrogen pump air inlet pipeline and the air inlet pipeline are both provided with pipeline filters.

In conclusion, the hydrogen circulating pump and ejector performance test system is used by matching of the subsystems, can actively adjust and control the gas inlet conditions of the hydrogen circulating pump and the ejector for the hydrogen fuel cell under different gas components, temperatures, pressures and humidity respectively, can simulate the real operating environment of the hydrogen circulating pump and the ejector in the hydrogen fuel cell more accurately, and can be better adapted to the hydrogen fuel cell.

The test system can also test the service performance of the hydrogen circulating pump and the ejector under the condition of parallel connection, and provides valuable data for various application modes of the pile hydrogen supply system. According to test data obtained by a test method, the performance of the designed hydrogen circulating pump and ejector can be effectively judged, support is provided for the optimal design of the hydrogen circulating pump and the ejector, and a reference basis is provided for equipment model selection of the galvanic pile hydrogen supply subsystem. Besides the performance test of the hydrogen circulating pump and the ejector, the test bed can also be used as a reliability test bed to carry out durability and start-stop test on the hydrogen circulating pump. The test system can also meet the test requirements of other gas working medium pumps.

In addition, a closed circulation operation mode is adopted, the test gas can be recycled, and particularly, when the ejector is used for testing, a low-pressure gas source does not need to be added, so that the test cost is favorably reduced, the resources are effectively saved, and the environment is protected.

Drawings

Figure 1 is the utility model discloses a hydrogen circulating pump and ejector capability test system's schematic diagram.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "upper, lower" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

the hydrogen supply unit and the nitrogen supply unit are connected with the working condition control unit, the working condition control unit is connected with a high-pressure air inlet pipeline, a low-pressure air inlet pipeline and a hydrogen pump air inlet pipeline through an opening adjusting valve, the high-pressure air inlet pipeline, the low-pressure air inlet pipeline and the hydrogen pump air inlet pipeline are respectively connected with a high-pressure inlet, a low-pressure inlet and a hydrogen pump inlet of an ejector, an ejector exhaust pipeline of the ejector and a hydrogen pump exhaust pipeline of the hydrogen pump are connected with an exhaust buffer tank, ball valves are respectively arranged on the ejector exhaust pipeline and the hydrogen pump exhaust pipeline, the exhaust buffer tank is connected with a main loop through an exhaust pipeline, the main loop is externally connected with a main vent pipeline, and the exhaust pipeline is connected with the main vent pipeline and is provided with a ball valve; the main loop is provided with a gas component detection unit;

The hydrogen supply unit comprises a hydrogen cylinder, a first pressure reducing valve group and a first ball valve which are connected through a hydrogen inlet pipeline; the nitrogen supply unit comprises a nitrogen bottle, a second pressure reducing valve group and a second ball valve which are connected through a nitrogen inlet pipeline; the hydrogen inlet pipeline and the nitrogen inlet pipeline are converged to form an inlet pipeline; the nitrogen-gas mixing device is characterized by further comprising a first bypass connected with the nitrogen supply unit, a first adjusting valve is arranged on the first bypass, the first adjusting valve is located between the second pressure reducing valve group and the second ball valve, the gas inlet pipeline and the first bypass are connected with the main loop, and an opening adjusting valve is arranged between the gas inlet pipeline and the first bypass.

Wherein, high pressure buffer tank, low pressure buffer tank, heating and humidifying module, vapour and liquid separator and exhaust buffer tank all outwards are connected with drain pipe and install the ball valve on the drain pipe.

In specific implementation, as shown in the attached figure 1 of the specification:

the whole performance test system can be divided into a gas supply unit, a working condition control unit, a measurement and acquisition unit, a safety protection unit, an ejector and a hydrogen circulating pump according to different functions, and further comprises a pipeline unit and an auxiliary unit.

By means of reasonable matching among the units, closed circulation tests of hydrogen circulation, performance tests of the ejector and parallel tests of the hydrogen circulation pump and the ejector can be performed, and test tests of different hydrogen supply systems are achieved.

As shown in fig. 1, the gas supply unit comprises a supply source of hydrogen and nitrogen, the hydrogen source 1 and the nitrogen source 2 are supplied by a standard high-pressure gas cylinder, and are connected to the test system through a gas inlet pipe and a connecting piece. The gas supply unit consists of a hydrogen cylinder 1, a nitrogen cylinder 2, pressure reducing valve groups 3 and 4, an electromagnetic valve 5, ball valves 7 and 8, an adjusting valve 9, a pipeline filter and corresponding pipelines. The gas from the hydrogen and nitrogen sources can realize one-way flow from the gas cylinder to the test system after passing through corresponding valves, and the pressure reducing valve banks 3 and 4 can adjust the pressure of the gas entering the test system; the electromagnetic valve 5 is automatically closed after detecting hydrogen leakage, and the hydrogen source is cut off in time; hydrogen enters the test system through the pressure reducing valve group 3, the electromagnetic valve 5 and the ball valve 7; nitrogen enters the system through the pressure reducing valve group 4 and the ball valve 8, air in the system is purged before the test is started and after the test is finished, and the nitrogen can enter the system through the regulating valve 9 during the mixed gas test; the pipe filter can prevent small particle impurities from entering the test system.

The pipeline unit provides a position for realizing a gas flow passage and also for installing the measuring equipment. The pipeline unit mainly comprises a pipeline and a valve.

(1) Most of pipelines of the pipeline unit adopt 316L stainless steel hard pipes, and the pipeline unit comprises: a gas inlet pipe for connecting a hydrogen source and a nitrogen source to enter the main loop, a main loop pipe for forming a gas source to the emptying pipe during open flow and a circulation during closed flow, an emptying pipe for connecting the main loop pipe to atmosphere, and a liquid discharge pipe for discharging liquid water condensed from moisture-containing gas; the test piece is required to be frequently disassembled and replaced at the connection part of the hydrogen circulating pump and the inlet and the outlet of the ejector,

metal hoses

41, 47, 51, 58 and 65 which are lined with polytetrafluoroethylene and wrapped by woven stainless steel are adopted for connection, and the test piece and a system adopt a chuck type quick connector. The rubber and plastic material heat preservation layer is laid on the outer surface of the pipeline, so that heat loss under the heating working condition is reduced, and contact scalding is prevented. The pipe filter 57 can filter out small particle impurities in the gas, and prevent the small particle impurities from entering the compression cavity of the hydrogen circulating pump to damage the rotor.

(3) The valve comprises a ball valve, an opening regulating valve, a safety valve, a check valve and an electromagnetic valve, wherein the ball valve is mainly used for cutting off, distributing and changing the flowing direction of a medium, the opening regulating valve is mainly used for regulating the pressure and the flow of gas, the safety valve is mainly used for preventing overpressure of the system, the check valve is mainly used for blocking backflow of the medium, and the electromagnetic valve is used for cutting off a hydrogen source in an emergency. As shown in fig. 1, each valve functions specifically as follows:

pressure reducing valve blocks 3, 4: the pressure reducing valve group is a two-stage pressure reducing valve and reduces the pressure of high-pressure gas in the gas cylinder to the pressure required by the test.

Electromagnetic valve 5: the hydrogen safety alarm is used as an emergency cut-off valve, and when the hydrogen safety alarm gives an alarm, a feedback signal is input to the electromagnetic valve 5 to cut off the hydrogen source emergently.

Safety valves 6, 30: and an overpressure protection device of the system in the loop automatically opens the safety valve to release pressure when overpressure occurs.

Check valve 32: and the atmosphere is prevented from flowing back to the pipeline system when the system is exhausted.

Ball valves 7, 8: the flow of hydrogen or nitrogen into the test system was controlled.

Adjusting valve 9: in the ejector mixed gas test, nitrogen is supplied to the system according to the detection result of the gas component detector 36.

Regulating valve 10, ball valve 11: the gas flow direction is controlled, gas can enter the circulating system through the regulating valve 10, the pipeline between the ball valve 10 and the ball valve 31 can be purged by closing the ball valve 17, and hydrogen can be supplemented to the system through the regulating valve 10 during the circulation test. The gas enters the high-pressure buffer tank through the ball valve 11.

Ball valves

13, 16, 21, 26, 68: and discharging the condensed water in the buffer tank, the heating and humidifying module and the steam-water separator.

The regulating valve 14: during the hydrogen circulating pump mixed gas circulation test, dispose the high-pressure gas of required gas composition in advance in the high-pressure buffer tank that admits air, when circulating pump operating mode changes and leads to the inlet pressure not enough, through valve 14 to the system tonifying qi.

Ball valves 17, 18: the ball valve 17 controls the gas to enter the low-pressure gas inlet buffer tank 15; ball valve 18 controls the flow of air into heating and humidifying module 20.

Ball valve 19: water can be added to the heating and humidifying module 20 through the ball valve 19 to ensure a liquid level required for humidification.

Regulating valves 22, 23, 24: closing the regulating valve 22, opening the ball valve 18 for a moisture test, closing the ball valve 18, opening the regulating valve 22, and performing a dry gas test; the regulating valves 22, 23 and 24 can control the temperature and humidity of the hydrogen circulating pump 62 and the ejector 44.

Ball valves 27, 34, 35: the ball valve 27 is a sampling control valve for measuring gas components entering the hydrogen circulating pump and the ejector when the hydrogen circulating pump 62 is open-type test or ejector 44 monomer test and the ejector 44 and circulating 62 pump are parallel test, the ball valve 34 is a sampling control valve for detecting gas components when the system is purged and filled with hydrogen, and the ball valve 35 is an exhaust valve of the gas component analyzer 36.

Ball valve 28: valve 28 is closed when the system is purged.

Ball valve 31: system exhaust and system purge exhaust valves.

Adjusting valves 37, 38: the flow rate of the test gas cycle and the flow rate of the purge are adjusted during the relevant tests of the eductor 44.

The regulating valve 39: the flow and pressure of the high pressure gas into the high pressure inlet of the eductor 44 is regulated.

Ball valves 48, 66, regulating valves 49, 55: and (3) selecting to perform an ejector test or a circulating pump test monomer test, or performing a parallel test of the ejector test and the circulating pump test monomer test. The hydrogen circulation pump 62 monomer test was performed by closing valves 48 and 49 and opening

valves

55 and 66; injector 44 monomer tests were performed by closing

valves

55 and 66 and opening valves 48 and 49; and opening the four valves, and adjusting the opening of the valves to perform a parallel test of the ejector and the circulating pump.

Ball valves 69, 71: the ball valves 69 and 71 are sampling valves of the gas oil content detector, and during the test of the circulating pump 62, the oil content of the exhaust gas of the circulating pump can be detected by the gas oil content detector 70 to evaluate the dynamic sealing performance of the circulating pump.

The regulating valve can be a manual regulating valve or an electric regulating valve.

the gas buffer tank is divided into a high-pressure gas inlet buffer tank 12, a low-pressure gas inlet buffer tank 15 and a gas exhaust buffer tank 67, so that the flowing stability of gas in the test system can be ensured, the fluid pressure fluctuation is reduced, and the function of a similar gas storage tank is realized in a closed cycle test. When the mixed gas test of the hydrogen circulating pump 62 is carried out, the high-pressure air inlet buffer tank 12 can be used as a high-pressure mixed gas storage tank, and when the working condition of the circulating pump changes and the air inlet pressure needs to be increased, air can be supplied and pressurized through the regulating valve 14 or 10. The material of the gas buffer tank is stainless steel, the gas inlet and outlet pipelines are arranged in a 90-degree manner, the gas inlet and outlet pipelines are arranged in a downward-inlet-upward-outlet manner, the bottom of the buffer tank is provided with a water discharge valve 13, 16 and 68, and each buffer tank is provided with a pointer type pressure gauge.

The working condition control unit consists of a valve in the pipeline system, a heating and humidifying module 20 and a steam-water separator 25. The regulation of gas composition, temperature, pressure and flow can be realized by the combination of valves and reasonable opening and closing. The heating and humidifying module 20 can heat water to the temperature required by the test and keep the temperature stable, and the heating temperature is adjustable. The test gas enters the heating and humidifying module to overflow from the small holes distributed at the bottom to exchange heat with hot water in a convection way, and simultaneously, part of water vapor is taken away, so that the test gas is changed into high-temperature high-humidity gas. The heating and humidifying module is a bubbling humidifier and consists of a tank body, a liquid inlet, a liquid outlet, an air inlet, an air outlet, a liquid level meter, an electric heater and a temperature sensor, the power of the electric heater is adjustable, PID control is carried out on the temperature detected by the sensor and the set temperature, the constant water temperature is ensured, the electric heater is arranged at the bottom of the heating and humidifying module, and the whole module adopts an explosion-proof structural design. The steam-water separator 25 is of a baffle type and consists of a tank body, a baffle, an air inlet, an air outlet and a liquid outlet, and the temperature and the humidity of the test gas can be adjusted by the heating and humidifying module 20, the steam-water separator 25 and the operation valves 22, 23 and 24.

The measuring and collecting unit inputs the signals to the data collecting system according to the signals of the sensor, and a collecting module in the data collecting system is connected with a computer to display the measuring result in real time. The measuring and collecting system consists of

temperature sensors

42, 46, 53, 60 and 63,

pressure sensors

43, 45, 54, 61 and 63, humidity sensors 52 and 59, flow sensors 40, 50 and 56, a gas composition detector 36, a gas oil content detector 70, a power analyzer, a data acquisition card and a computer. Each sensor is a voltage type or current type sensor and is connected with the data acquisition card; the gas component detector 36 is a hydrogen-nitrogen-oxygen compound gas detector, and can detect the gas components and the content in the test system on line in real time; the gas oil content detector 70 can detect the content of organic hydrocarbon in gas on line in real time, and the data acquisition card is used for receiving and converting the acquired signals and can realize the real-time data display, acquisition and storage of the measurement and acquisition system by combining with the sensor, the gas detector, the power analyzer and the computer.

The safety protection unit consists of safety valves 6 and 30, a check valve 32, a flame arrester 33, a combustible gas detector, an audible and visual alarm, an electromagnetic valve 5 and a ground protection 29. The safety valves 6 and 30 automatically open to exhaust gas after the gas in the test system is over-pressurized; check valve 32 may prevent reverse flow of gas when the system is empty; flame arrestor 33 prevents flame from flowing back into the test system in the event of accidental combustion of hydrogen; the combustible gas detector detects the hydrogen concentration in a laboratory where the test system is located, when the hydrogen concentration in the air reaches a combustible limit, the audible and visual alarm connected with the combustible gas detector gives an alarm, the electromagnetic valve 5 is a normally open electromagnetic valve and is linked with the alarm, and when the audible and visual alarm gives an alarm, the electromagnetic valve is linked to automatically close and cut off a hydrogen source to stop supplying the gas into the system. The grounding protection is that the whole test system is grounded through a cable, so that static electricity and sparks are avoided.

The accessory unit includes a stand support for power distribution and performance testing system equipment. The power supply and distribution system does the utility model discloses each consumer of capability test system provides and distributes corresponding power and controls it, mainly comprises explosion-proof switch board, explosion-proof adjustable DC power supply etc.. The rack support mainly comprises 40-by-40 aluminum profiles and accessories thereof, and can provide support and fixation for the systems and equipment thereof after being assembled as required.

Second, detailed description of the invention

2.1. System leak detection and purge

The hydrogen circulating pump 62 and the ejector 44 are correctly connected into the test system, the nitrogen pressure reducing valve 4 and the ball valve 8 are opened, the hydrogen pipeline valve 7 is closed, nitrogen is filled into the system, pressure maintaining and leakage detection are carried out on the system according to requirements, a subsequent test can be carried out only when the leakage rate of the system meets relevant requirements, and otherwise, leakage points are processed firstly.

By adopting a segmented purging principle,

valves

10, 14, 28, 38, 49 and 66 are closed, valves 11, 39, 48 and 31 are opened to purge the high-pressure inlet buffer tank 12, the high-pressure inlet of the ejector 44, the mixed gas exhaust port, the exhaust buffer tank 67 and the exhaust pipeline,

valves

34 and 35 are opened, the gas composition is detected by the gas composition detector 36, and when the oxygen content is lower than 0.5%, the pipeline purging is completed. Then the valves 11, 18 and 55 are closed, the valves 10, 17, 22 and 49 are opened, the low-pressure air inlet pipeline of the low-pressure air inlet buffer tank and the ejector 44 is purged, after the purging is finished, the valves 22, 49 and 48 are closed, the

valves

18, 55 and 66 are opened, and the heating and humidifying module 20, the gas-liquid separator 25 and the bypass, the air inlet pipeline and the air outlet pipeline of the hydrogen circulating pump 62 and the subsequent pipeline of the air outlet buffer tank 67 are purged. Finally, valves 17, 37 are closed and valve 28 is opened to purge the remaining lines.

The hydrogen purging process is consistent with the nitrogen purging operation process, the valve 7 is opened by closing the valve 8, the pressure reducing valve group 3 is adjusted to the specified pressure, the corresponding valve is operated according to the nitrogen purging process, and the hydrogen purging is completed when the hydrogen content detected by the gas component detector 36 is higher than 99%.

Nitrogen purging and hydrogen purging are carried out before all tests are started, so that the gas components in the system meet the test requirements; after the test, nitrogen purging is performed to replace the hydrogen in the system with nitrogen.

2.2. Mixed gas preparation

Preparing mixed gas for a hydrogen circulating pump mixed gas closed circulation test: after the hydrogen purging is finished, closing valves 39, 49 and 49 to isolate the ejector system, closing the exhaust valve 31 and the gas inlet valve 34 of the gas composition detector, and opening valves 11 and 14 to fill hydrogen with certain pressure into the system; calculating the nitrogen pressure to be supplemented according to the hydrogen and nitrogen component proportion and the Dalton partial pressure law required by the test, starting a hydrogen circulating pump 62 to fully and uniformly mix the gas after the supplement is finished, opening a valve 34 to detect the components of the mixed gas, carrying out fine adjustment, closing the valve 34 and a gas component detector after the mixed gas is prepared, and then closing the valves 10, 11 and 14.

Preparing mixed gas for ejector test or two parallel tests: because the ejector participates in the test and actually belongs to the semi-open type test, high-pressure hydrogen and low-pressure nitrogen are required to be continuously supplemented, and redundant gas is eliminated, so that a real-time supplementing mode is adopted. After the hydrogen purging of the system is finished, opening valves 27 and 35, closing valve 34, detecting gas components entering a low-pressure inlet of the ejector and an inlet of the hydrogen circulating pump in real time, closing valves 8, 10 and 14, opening valves 7 and 11, adjusting

valves

39, 49, 48, 55, 66, 37 and 38 to start a test, and automatically injecting a certain amount of nitrogen into the system by the adjusting valve 9 according to the detected gas components and the required gas components to enable the gas components to reach the component concentration required by the test.

2.3. Test gas temperature and humidity regulation

The valves 18 and 24 are opened, the valves 22 and 23 are closed, the opening degree of the valve 22 is adjusted to realize temperature adjustment according to the humidity and the temperature measured by the ejector low-pressure inlet humidity sensor 52 and the temperature sensor 53 or the circulating pump inlet humidity sensor 59 and the temperature sensor 60, and the opening degree of the valve 23 is adjusted to realize humidity adjustment.

2.4. Closed cycle test of hydrogen circulating pump

After gas in the system is replaced into required gas according to the purging flow, the valves 10, 11, 14, 48 and 49 are closed during a closed circulation test of the hydrogen circulating pump, the ejector pipeline system is isolated, meanwhile, the valves 22, 23, the exhaust valves 31 and 38 are closed, the

valves

17, 18, 24, 55 and 66 are opened, the heating and humidifying module is opened, the heating temperature is set, the set temperature is higher than the inlet required temperature of the hydrogen circulating pump due to heat dissipation of the pipeline, and the hydrogen circulating pump 62 is started to perform a closed circulation test of heating, humidifying and air inlet of the circulating pump. Under the condition of hydrogen, different pressures can be adjusted through the valve 37, the pressure of the intake air and the exhaust air can be changed after the pressure rise is adjusted, and at the moment, the air supply valve 10, the pressure rise adjusting valve 37 and the exhaust valve 38 are required to be adjusted simultaneously to stabilize the pressure of the intake air and the exhaust air; under the condition of gas mixture, high-pressure gas mixture with certain pressure is stored in the high-pressure gas inlet buffer tank 12 in advance, the valves 10, 14 and 39 are in a closed state, gas can be supplemented through the valve 10 or 14 when the working condition changes, the gas inlet and outlet pressure is adjusted through the valve 37, and the gas is exhausted through the valve 38. After the mixed gas in the high-pressure gas inlet buffer tank 12 is used up, the mixed gas needs to be prepared again, the components of the residual gas are measured firstly, and then the gas pressures which need to be respectively supplemented are calculated according to the current pressure and the Dalton partial pressure law, and the specific preparation method is the same as that described above. At a certain speed, when the measured data of the temperature sensors 60 and 64, the pressure sensors 61 and 63, the humidity sensor 59 and the flowmeter 56 at the inlet and the outlet of the circulating pump are stable, the data are recorded, and then the adjustment of the next working condition is carried out.

2.5. Ejector monomer test

The system had a nitrogen purge and hydrogen purge as required at 2.1 before the start of the test,

valves

55, 66 were closed to isolate the recycle pump system, and valves 10, 14 were closed to isolate the high pressure feed gas from the low pressure feed gas. The valves 11, 39, 48, 37, 28, 17, 18, 24 are opened, the

valves

8, 9, 22, 23, 31, 34, 38 are closed, and the heating and humidifying module 20 is turned on. When a hydrogen test is performed, the pressure of the pressure reducing valve 3 is adjusted, the valve 7 is opened, and the regulating valves 39, 37 and 38 regulate the intake pressure and flow rate and the exhaust gas flow rate to make the high-pressure intake pressure, the low-pressure intake pressure and the exhaust pressure reach the test requirement values, and the regulating valves 22, 23 and 24 make the low-pressure intake temperature and humidity reach the test requirement values. When a mixed gas test is carried out, the pressure of the nitrogen pressure reducing valve group is adjusted, the valves 27 and 35 are opened, the gas component detector is opened to measure the gas components at the inlet of the ejector in real time, the adjusting valve 9 supplements nitrogen to the system, so that the gas components in the system meet the test requirements, and the method for adjusting the gas inlet and outlet pressure, the temperature and the humidity of the ejector is the same as the method 2.3. And recording relevant data when the air inlet and outlet temperature, pressure, humidity and flow of the ejector reach stability. And then adjust to the next operating condition.

2.6. Ejector and hydrogen circulating pump parallel test

In the single injector test, the valves 10 and 14 are closed to isolate high-pressure inlet gas from low-pressure inlet gas, and the

valves

48, 49, 55 and 66 are opened or closed according to the sequence of the operation of the hydrogen circulating pump and the injector. The operation sequence of putting the circulating pump into operation is explained below, the injectors are isolated by closing valves 39, 48 and 49, the circulating pump is started according to the single test flow of the hydrogen circulating pump, then the valve 48 and the regulating valves 39 and 49 are opened at the working point required by the test scheme to put the injectors into the system, meanwhile, the regulating valves 37 and 38 keep the circulating flow and the emptying flow relatively stable, the regulating valves 49 and 55 distribute the flow entering the low-pressure inlet of the injectors and the flow entering the hydrogen circulating pump, and the pressure of the air inlet and the exhaust can reach the value required by the test through the regulating valves 48 and 66. The temperature and humidity of the inlet air are regulated in the same way as the above 2.3, and the mixed gas test and the ejector monomer test are carried out.

Third, test method

3.1 preparation of the test

(1) And (4) inspecting the test bed and the power supply and distribution system, and eliminating the hidden danger of looseness of each interface.

(2) And turning on a main power switch, adjusting each power switch of the electrical control system to enable the control electricity and the instrument to be electrically turned on and the power electricity to be turned off, turning on each measuring and detecting device and debugging to a normal working state.

(3) And (3) opening a power electric switch, and replacing the gas in the test system into hydrogen or a hydrogen-nitrogen mixture according to the methods described in 2.1 and 2.2.

(4) And starting the heating and humidifying module, preheating water to the required temperature, and finishing the preparation work.

3.2 testing

(1) According to different test requirements, the method is operated according to the method 2.4-2.6.

(2) And adjusting the test conditions according to the gas components, the air inlet pressure, the air outlet pressure, the temperature and the humidity according to the test contents.

(3) After the test working condition is adjusted, the upper computer controls the rotating speed of the hydrogen circulating pump, and when the hydrogen circulating pump reaches a stable operation state or a dynamic quasi-stable operation state, test parameter acquisition and storage are started. The acquisition system can respectively acquire parameters such as inlet flow, air inlet and outlet pressure, temperature, humidity, gas components and the like of the hydrogen circulating pump and the ejector, and the power analyzer can measure parameters such as power, voltage, current and the like input and output by the hydrogen circulating pump controller.

(4) And (3) designing a test working condition table according to a single variable principle, and repeating the steps (2) and (3) to test the performance of the hydrogen circulating pump and the ejector under different working conditions.

3.3 end of test

(1) And turning off the heating and humidifying module 20 and other working condition adjusting equipment.

(2) Replacing the gas in the system with nitrogen according to the method 2.2; then the liquid discharge pipeline is opened to discharge liquid water and then closed.

(3) And (3) turning off the power supply of each measuring device, turning off the power supply, the control power supply and the instrument electric switch, and turning off the main power switch.

(4) And checking whether the loop of the test system and each device are intact, and arranging the racks to finish the test.

Finally, it should be noted that: various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, to the extent that such modifications and variations of the present invention fall within the scope of the present claims and their equivalents, it is intended that the present invention encompass such modifications and variations as well.

Claims

1. A performance test system for a hydrogen circulating pump and an ejector is characterized by comprising a gas supply unit, a working condition control unit, a measurement and acquisition unit, an ejector and a hydrogen circulating pump;

2. The system for testing the performance of the hydrogen circulating pump and the ejector as claimed in claim 1, wherein the hydrogen supply unit comprises a hydrogen cylinder, a first pressure reducing valve group and a first ball valve which are connected through a hydrogen inlet pipeline; the nitrogen supply unit comprises a nitrogen bottle, a second pressure reducing valve group and a second ball valve which are connected through a nitrogen inlet pipeline; the hydrogen inlet pipeline and the nitrogen inlet pipeline are converged to form an inlet pipeline; still include the first bypass of being connected with nitrogen gas supply unit, be provided with first governing valve on the first bypass, first governing valve is located between second decompression valves and the second ball valve, air inlet pipe way and first bypass are connected with the major loop, and are provided with the aperture governing valve between air inlet pipe way and the first bypass.

3. The system for testing the performance of the hydrogen circulating pump and the ejector as claimed in claim 2, wherein the measuring and collecting unit comprises a temperature sensor and a pressure sensor which are arranged on the high-pressure air inlet pipeline, the low-pressure air inlet pipeline, the hydrogen pump air inlet pipeline, the ejector exhaust pipeline and the hydrogen pump exhaust pipeline, a humidity sensor which is arranged on the low-pressure air inlet pipeline and the hydrogen pump air inlet pipeline, and a flow sensor which is arranged on the high-pressure air inlet pipeline, the low-pressure air inlet pipeline and the hydrogen pump air inlet pipeline.

4. The system for testing the performance of the hydrogen circulating pump and the ejector according to claim 1, wherein the working condition control unit comprises an air pressure control unit and a temperature and humidity control unit;

5. The system for testing the performance of the hydrogen circulating pump and the ejector according to claim 1, wherein the high-pressure air inlet buffer tank, the low-pressure air inlet buffer tank, the heating and humidifying module, the gas-liquid separator and the exhaust buffer tank are all connected with a liquid discharge pipeline outwards, and a ball valve is arranged on the liquid discharge pipeline.

6. The system for testing the performance of the hydrogen circulating pump and the ejector according to claim 1, wherein the gas component detection unit comprises a gas component detector, an inlet and an outlet of the gas component detector are connected with a third ball valve and a fourth ball valve, a fifth ball valve is arranged between the third ball valve and the fourth ball valve and connected with a main emptying pipeline, an inlet of the gas component detector is connected with the low-pressure air inlet pipeline and the hydrogen pump air inlet pipeline through a detection pipeline, and a sixth ball valve is arranged on the detection pipeline.

7. The system for testing the performance of the hydrogen circulating pump and the ejector as claimed in claim 1, further comprising a safety protection unit, wherein the safety protection unit comprises a safety valve, a flame arrester, a check valve, a combustible gas detector, an audible and visual alarm, a ground protection and an electromagnetic valve arranged between the first pressure reducing valve bank and the first ball valve on the hydrogen inlet pipeline; the fire arrestor and the check valve are installed on a main emptying pipeline, the safety valve is installed on a main loop, the test system is grounded through a cable under the ground protection, the combustible gas detector is placed in a laboratory where the test system is located, and the combustible gas detector is connected with the audible-visual alarm, the electromagnetic valve and the electrical control system.

8. The system for testing the performance of the hydrogen circulating pump and the ejector according to claim 1, wherein pipeline filters are arranged on the hydrogen pump air inlet pipeline and the hydrogen pump air inlet pipeline.