Hydrogen supply system

Abstract

The invention provides a hydrogen supply system, which relates to the technical field of new energy vehicles, and comprises a first gas cylinder and a second gas cylinder which share the same liquid filling port, the same gas return port and the same heat exchanger, the heat exchanger is connected with a heating assembly and communicates with a first air outlet pipeline, and a third valve is arranged on the first air outlet pipeline. The first gas cylinder is communicated with a first pressurizing gas outlet pipeline, a first pressurizing gas return pipeline and a first liquid outlet pipeline, and the second gas cylinder is communicated with a second pressurizing gas outlet pipeline, a second pressurizing gas return pipeline and a second liquid outlet pipeline; the first pressurizing air outlet pipeline and the second pressurizing air return pipeline are communicated with an air inlet of the heat exchanger through a first pipeline; a fourth valve and a fifth valve are arranged between the first pressurizing air return pipeline and the second pressurizing air outlet pipeline, one end of a second pipeline is connected between the fourth valve and the fifth valve, and the other end of the second pipeline is communicated with the first air outlet pipeline. The hydrogen supply system provided by the invention has the advantages of being high in integration degree, capable of meeting the use requirements of the main engine under various working conditions and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a hydrogen supply system. Background Art

[0002] The hydrogen energy industry chain can be divided into three aspects: upstream hydrogen preparation, midstream hydrogen storage and transportation, and downstream hydrogen energy application. Liquid hydrogen, as a form of hydrogen, has a larger storage capacity than gaseous hydrogen. After liquid hydrogen is vaporized and supplied to fuel cells or internal combustion engines, the hydrogen supply system needs to be arranged above the vehicle beam or on the side of the vehicle. According to the vehicle's operating conditions, long-distance transportation, heavy-duty vehicles, high-power hosts and other scenarios require large-capacity hydrogen storage containers. At this time, a single-bottle hydrogen storage container can no longer meet the application requirements. Therefore, the reasonable, efficient and intelligent layout of the double-side or double-layer container system is particularly important for large-capacity hydrogen supply systems. At the same time, the pressurization of cryogenic liquids, especially the pressurization problem before the host is started / at low liquid level / at low pressure, has long plagued the use of the gas supply system. Therefore, a reasonable and effective pressurization method has also become an important problem that the gas supply system needs to solve.

[0003] When using the dual-bottle solution arranged on both sides of the automobile frame, the traditional solution is to use a set of filling, return, vaporization, pressurization, and gas supply pipelines for the single-side gas cylinder alone; the traditional pressurization solution uses the method of returning the liquid medium to the gas cylinder after heat exchange with circulating water, or uses the vaporized gas to return to the gas cylinder and then enter the main engine.

[0004] Therefore, the traditional solution has the following shortcomings: 1. The method of using a single-side gas cylinder alone with a set of pipelines has a low degree of integration and occupies the layout space of the entire vehicle; 2. The boosting method of returning the liquid phase to the gas phase after vaporization prolongs the boosting time at low liquid level / low pressure, affecting the use of the vehicle; 3. The method of using the vaporized gas to return to the gas cylinder usually uses the gas entering the engine to enter the gas cylinder. After heat exchange with the low-temperature liquid in the gas cylinder, the gas is cooled, and then enters the vaporizer to heat up and enters the main engine for use. This method cannot be operated when the vehicle is parked, that is, the boosting cannot be performed when the vehicle is parked, and the boosting effect is poor at low liquid levels, affecting the gas supply to the main engine. Summary of the invention

[0005] The object of the present invention is to provide a hydrogen supply system which has the advantages of high degree of integration and the ability to meet the use requirements of a host under various working conditions.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a hydrogen supply system, comprising a first gas cylinder and a second gas cylinder which share the same liquid filling port, gas return port and heat exchanger;

[0008] The heat exchanger is connected to a heating component for heating the coolant in the heat exchanger, a first air outlet of the heat exchanger is connected to a first air outlet pipeline, a third valve is provided on the first air outlet pipeline, the third valve is used to communicate with the host, a second air outlet of the heat exchanger is connected to a second air outlet pipeline, a third one-way valve is provided on the second air outlet pipeline, and a second circulation pump is connected in parallel on both sides of the third one-way valve;

[0009] The first gas cylinder is connected with a first pressurized gas outlet pipeline, a first pressurized gas return pipeline and a first liquid outlet pipeline, and the second gas cylinder is connected with a second pressurized gas outlet pipeline, a second pressurized gas return pipeline and a second liquid outlet pipeline;

[0010] The first pressurized air outlet pipeline is connected to the second pressurized air return pipeline, and the connecting point between the first pressurized air outlet pipeline and the second pressurized air return pipeline is connected to the air inlet of the heat exchanger through a first pipeline;

[0011] The first pressurized return air pipeline is connected to the second pressurized outlet air pipeline, and a fourth valve and a fifth valve are provided therebetween; one end of the second pipeline is connected between the fourth valve and the fifth valve, and the other end of the second pipeline is connected to the first outlet port of the heat exchanger and the first outlet air pipeline between the third valve;

[0012] The first liquid outlet pipeline and the second liquid outlet pipeline are both in communication with the fuel liquid inlet of the heat exchanger.

[0013] Further, the heating assembly includes an eighth valve, a heater and a circulation pump;

[0014] The inlet and outlet of the eighth valve are respectively connected to the condensate outlet and the condensate inlet of the heat exchanger;

[0015] The heater and the circulation pump are connected in series, and the heater and the circulation pump are connected in parallel with the eighth valve as a whole.

[0016] Furthermore, the first gas cylinder is connected to a first filling pipeline, and the first filling pipeline is provided with a first stop valve;

[0017] The second gas cylinder is connected to a second filling pipeline, a second stop valve is arranged on the second filling pipeline, and an end of the second filling pipeline away from the second gas cylinder and an end of the first filling pipeline away from the first gas cylinder are connected to the same filling port.

[0018] Furthermore, the first gas cylinder is connected to a first gas phase pipeline, and a third stop valve is provided on the first gas phase pipeline;

[0019] The second gas cylinder is connected to a second gas phase pipeline, a fourth stop valve is arranged on the second gas phase pipeline, and an end of the second gas phase pipeline away from the second gas cylinder and an end of the first gas phase pipeline away from the first gas cylinder are connected to the same gas return port.

[0020] Further, the first filling pipeline is connected to the first centralized release port through a first discharge pipeline, and the first discharge pipeline is provided with a first safety valve;

[0021] A second discharge pipeline is connected between the first gas phase pipeline and the first centralized discharge port, and the second discharge pipeline is provided with a second safety valve;

[0022] A third discharge pipeline is connected between the second pipeline and the first centralized discharge port, and the third discharge pipeline is provided with a third safety valve.

[0023] Furthermore, the first liquid outlet pipeline is provided with a first valve component for controlling the on-off and flow state of the first liquid outlet pipeline;

[0024] The end of the first liquid outlet pipeline facing away from the first gas cylinder is connected to the connecting point of the first gas phase pipeline and the second discharge pipeline, and a sixth valve is provided between the connecting point of the first gas phase pipeline and the second discharge pipeline and the end of the first liquid outlet pipeline facing away from the first gas cylinder.

[0025] Furthermore, the second gas phase pipeline is connected to the second centralized release port through a fourth release pipeline, and the fourth release pipeline is provided with a fourth safety valve;

[0026] A fifth discharge pipeline is connected between the second filling pipeline and the second centralized discharge port, and the fifth discharge pipeline is provided with a fifth safety valve.

[0027] Furthermore, the second gas phase pipeline is connected to the fuel liquid inlet of the heat exchanger through an exhaust pipe, and the exhaust pipe is provided with a seventh valve.

[0028] Furthermore, a second valve component for controlling the on-off and flow state of the second liquid outlet pipeline is provided on the second liquid outlet pipeline.

[0029] Furthermore, it also includes a hydrogen supply main line, one end of which is connected to the first gas outlet line and the second gas outlet line, and the other end is provided with a buffer tank and a gas supply valve group in sequence and is used to communicate with the main engine.

[0030] The hydrogen supply system provided by the present invention can produce the following beneficial effects:

[0031] The above hydrogen supply system has at least the following functions:

[0032] 1) System filling function: Cryogenic liquid enters the first gas cylinder and the second gas cylinder from the filling port to complete the filling process.

[0033] 2) System gas return / manual venting function: The overpressure gas in the first gas cylinder and the second gas cylinder is discharged / recovered from the same gas return port to complete the gas return function.

[0034] 3) Cold start gas function: When the vehicle is cold started (pressure meets the requirements), the coolant temperature is not enough to vaporize the low-temperature liquid flowing through the heat exchanger. At this time, the heating component needs to be started. After the coolant temperature and flow rate in the heat exchanger meet the vaporization requirements, the low-temperature liquid in the first gas cylinder and the second gas cylinder is discharged. After the low-temperature liquid is vaporized by the heat exchanger, it becomes a gas that meets the requirements of the main engine, and flows into the subsequent components through the third valve and enters the main engine.

[0035] 4) Normal gas use function: After the coolant temperature in the heat exchanger meets the vaporization requirements, turn off the heating component and use the heat from the main engine circulation to heat the liquid to complete the liquid hydrogen vaporization process.

[0036] 5) Pressurized gas function: When the gas phase pressure in the first gas cylinder and / or the second gas cylinder is low, the pressure after vaporization does not meet the requirements of the host. At this time, the gas cylinder needs to be pressurized, the third valve is closed, the fourth valve and / or the fifth valve are opened (single opening is for single-bottle pressurized gas, double opening is for double-bottle pressurized gas), and the heating component is in a closed state. Taking double opening as an example, after the high-temperature gas vaporized by the heat exchanger flows through the first gas cylinder and the second gas cylinder, the liquid in the two gas cylinders is heated to increase the liquid pressure, thereby increasing the pressure of the two gas cylinders to meet the pressure required by the host (the temperature of the gas flowing out of the two gas cylinders is reduced at this time), and the low-temperature gas is heated by the heat exchanger and then flows into the subsequent components into the host through the third one-way valve to complete the pressurized gas function (both pressurizing the gas cylinder and continuously supplying gas to the host). The third valve can also be opened for pressurization, but the pressurization efficiency is worse than closing the third valve.

[0037] 6) Cold start boost function: When the vehicle is cold started, if the pressure in the cylinder is insufficient, the above 3) cold start gas use function and 5) boost gas use function cannot be performed. At this time, the cold start boost function is turned on: the third valve, the fourth valve and the fifth valve are opened, the first gas cylinder and the second gas cylinder do not discharge low-temperature liquid, the heating component is started, and after the coolant temperature in the heat exchanger meets the vaporization requirements, the second circulation pump is turned on, and the gas in the first boost outlet pipeline, the first boost return pipeline, the second boost outlet pipeline and the second boost return pipeline circulates internally to complete the "low-temperature gas enters the heat exchanger and then heats up - high-temperature gas enters at least one of the two gas cylinders - corresponding gas cylinder is pressurized - gas cools down - gas enters the heat exchanger and then heats up" cycle. After the cylinders are pressurized, normal gas use can be carried out.

[0038] Compared with the prior art, the first gas cylinder and the second gas cylinder in the hydrogen supply system provided by the present invention can share the same filling port, gas return port, centralized release port and heat exchanger, and the structure is compact, the degree of integration is high, and the whole vehicle layout is convenient. In addition, the above hydrogen supply system uses gas heating to pressurize the gas cylinder, which can meet the host use requirements under various working conditions of the whole vehicle, especially the cold start pressurization function, which can meet the corresponding working conditions at low liquid level / low pressure / cold start. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A schematic structural diagram of a hydrogen supply system provided in an embodiment of the present invention.

[0041] Icons: 1-filling port; 2-return port; 3-heat exchanger; 31-first air outlet; 32-second air outlet; 33-fuel inlet; 34-air inlet; 4-first gas cylinder; 5-second gas cylinder; 6-heating assembly; 61-eighth valve; 62-heater; 63-circulating pump; 7-first air outlet pipeline; 8-third valve; 9-second air outlet pipeline; 10-third non-return valve; 011-second circulating pump; 012-first boost outlet pipeline; 013-first boost return pipeline; 014-second boost outlet pipeline; 015-second boost return pipeline; 016-first pipeline; 017-fourth valve; 018-fifth valve; 019-second pipeline; 020-first filling pipeline; 021-first stop valve; 022-second filling pipeline; 023-second stop valve; 02 4-first gas phase pipeline; 025-third stop valve; 026-second gas phase pipeline; 027-fourth stop valve; 028-first centralized release port; 029-first discharge pipeline; 030-first safety valve; 031-second discharge pipeline; 032-second safety valve; 033-third discharge pipeline; 034-third safety valve; 035-first liquid outlet pipeline; 036-first valve assembly; 037-sixth valve; 038-second centralized release port; 039-fourth discharge pipeline; 040-fourth safety valve; 041-fifth discharge pipeline; 042-fifth safety valve; 043-exhaust pipeline; 044-seventh valve; 045-second liquid outlet pipeline; 046-second valve assembly; 047-hydrogen supply main pipeline; 048-buffer tank; 049-gas supply valve group; 050-host. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0046] This embodiment provides a hydrogen supply system. Figure 1 As shown, it includes a first gas cylinder 4 and a second gas cylinder 5 which share the same liquid filling port 1, gas return port 2 and heat exchanger 3;

[0047] The heat exchanger 3 is connected to a heating assembly 6 for heating the coolant in the heat exchanger 3. The first air outlet 31 of the heat exchanger 3 is connected to a first air outlet pipeline 7. The first air outlet pipeline 7 is provided with a third valve 8. The third valve 8 is used to communicate with the host 050. The second air outlet 32 ​​of the heat exchanger 3 is connected to a second air outlet pipeline 9. The second air outlet pipeline 9 is provided with a third one-way valve 10. The second circulating pump 011 is connected in parallel on both sides of the third one-way valve 10.

[0048] The first gas cylinder 4 is connected with a first pressurized gas outlet pipeline 012, a first pressurized gas return pipeline 013 and a first liquid outlet pipeline 035, and the second gas cylinder 5 is connected with a second pressurized gas outlet pipeline 014, a second pressurized gas return pipeline 015 and a second liquid outlet pipeline 045;

[0049] The first pressurized air outlet pipeline 012 is connected to the second pressurized air return pipeline 015, and the connecting point between the first pressurized air outlet pipeline 012 and the second pressurized air return pipeline 015 is connected to the air inlet 34 of the heat exchanger 3 through the first pipeline 016;

[0050] The first pressurized return air pipeline 013 is connected to the second pressurized outlet air pipeline 014, and a fourth valve 017 and a fifth valve 018 are provided therebetween. The fourth valve 017 and the fifth valve 018 are connected to one end of the second pipeline 019, and the other end of the second pipeline 019 is connected to the first outlet port 31 of the heat exchanger 3 and the first outlet air pipeline 7 between the third valve 8.

[0051] The first liquid outlet pipeline 035 and the second liquid outlet pipeline 045 are both connected to the fuel liquid inlet 33 of the heat exchanger 3 .

[0052] In the hydrogen supply system provided in the above embodiment, firstly, the first gas cylinder 4 and the second gas cylinder 5 can share the same filling port 1, gas return port 2 and heat exchanger 3, and can even share the same centralized discharge port, which makes the two gas cylinders need to share more pipelines, thereby improving the utilization rate of pipelines. Compared with the method in the prior art where each gas cylinder uses a set of pipelines separately, the structure is more compact, which is convenient for hydrogen supply system integration and vehicle layout, and is conducive to the lightweight of the vehicle. At the same time, the electrical components can be centrally controlled, thereby improving the degree of integration.

[0053] The above hydrogen supply system has the following functions when used:

[0054] 1) System filling function: cryogenic liquid enters the first gas cylinder 4 and the second gas cylinder 5 respectively from the same filling port 1, completing the filling process of liquid hydrogen.

[0055] 2) System gas return / manual venting function: The overpressure gas in the first gas cylinder 4 and the second gas cylinder 5 can be discharged / recovered from the same gas return port 2 to complete the gas return function.

[0056] 3) Cold start gas function: When the vehicle is cold started (when the pressure meets the requirements), the temperature of the coolant in the heat exchanger 3 is not enough to vaporize the low-temperature liquid flowing through the heat exchanger 3. At this time, the fourth valve 017 and the fifth valve 018 are closed, and the heating component 6 is started. The heating component 6 heats the coolant in the heat exchanger 3. After the temperature and flow rate of the coolant in the heat exchanger 3 meet the vaporization requirements, the low-temperature liquid in the first gas cylinder 4 and the second gas cylinder 5 are discharged from the first liquid outlet pipeline 035 and the second liquid outlet pipeline 045 respectively, and enter the fuel inlet 33 of the heat exchanger 3. After the low-temperature liquid is vaporized by the heat exchanger 3, it becomes gas that meets the requirements of the main engine 050, and is discharged to the first gas outlet pipeline 7 through the first gas outlet 31, and flows into the subsequent components through the third valve 8 on the first gas outlet pipeline 7 and enters the main engine 050.

[0057] 4) Normal gas use function: After the coolant temperature in the heat exchanger 3 meets the vaporization requirements, the heating component 6 is turned off, and the heat of the main engine 050 circulation is used to heat the liquid to complete the liquid hydrogen vaporization process.

[0058] 5) Pressurized gas function: When the gas pressure in the first gas cylinder 4 and / or the second gas cylinder 5 is low, the pressure after vaporization does not meet the requirements of the host, and the gas cylinder needs to be pressurized. Close the third valve 8, open the fourth valve 017 and / or the fifth valve 018 (opening one valve for single-bottle pressurized gas, opening two valves for double-bottle pressurized gas), and the heating component 6 is in a closed state.

[0059] Taking double opening as an example, the cryogenic liquid in the first gas cylinder 4 and the second gas cylinder 5 is discharged from the first liquid outlet pipeline 035 and the second liquid outlet pipeline 045 respectively, and enters the fuel liquid inlet 33 of the heat exchanger 3. The cryogenic liquid is vaporized by the heat exchanger 3 to become gas that meets the requirements of the host 050, and is discharged to the first gas outlet pipeline 7 through the first gas outlet 31. Subsequently, the vaporized gas passes through the second pipeline 019, the fourth valve 017 on the first booster return gas pipeline 013, and the fifth valve 018 on the second booster outlet pipeline 014 to enter the first gas cylinder 4 and the second gas cylinder 5 respectively, so as to regulate the liquid in the two gas cylinders. Heating increases the liquid pressure, thereby increasing the pressure of the two gas cylinders to meet the pressure required by the main engine 050 (at this time, the temperature of the gas flowing out of the two gas cylinders decreases due to the heat exchange between the vaporized gas and the liquid in the two gas cylinders). The low-temperature gas flowing out of the first pressurized gas outlet pipeline 012 and the second pressurized gas return pipeline 015 enters the heat exchanger 3 through the air inlet 34 for heating, then flows out from the second gas outlet 32, enters the second gas outlet pipeline 9, and then flows into the subsequent components through the third one-way valve 10 and enters the main engine 050, completing the pressurized gas function (both pressurizing the gas cylinders and continuously supplying gas to the main engine 050).

[0060] Taking the single-open fourth valve 017 as an example, the low-temperature liquid in the first gas cylinder 4 is discharged from the first liquid outlet pipeline 035 and enters the fuel liquid inlet 33 of the heat exchanger 3. The high-temperature gas vaporized by the heat exchanger 3 flows through the first gas cylinder 4 through the second pipeline 019 and the fourth valve 017, heating the liquid in the first gas cylinder 4 to increase the liquid pressure, thereby increasing the pressure of the first gas cylinder 4 to meet the pressure required by the host 050 (at this time, the temperature of the gas flowing out of the first gas cylinder 4 is reduced), and the low-temperature gas flowing out of the first booster gas outlet pipeline 012 reaches the gas inlet 34 through the first pipeline 016, enters the heat exchanger 3 for heating and temperature rise, and then flows out from the second gas outlet 32, enters the second gas outlet pipeline 9, and then flows into the subsequent components through the third one-way valve 10 and enters the host 050, completing the booster gas function (both pressurizing the gas cylinder and continuously supplying gas to the host 050).

[0061] In the above function, the third valve 8 can also be opened to increase pressure, but the pressure increase efficiency is lower than that when the third valve 8 is closed.

[0062] 6) Cold start boost function: When the vehicle is cold started, if the pressure in the cylinder is insufficient, the above 3) cold start gas use function and 5) boost gas use function cannot be performed. At this time, the cold start boost function is turned on: the third valve 8, the fourth valve 017 and the fifth valve 018 are opened, the first gas cylinder 4 and the second gas cylinder 5 do not discharge low-temperature liquid, the inlet of the buffer tank 048 is closed, and then the heating component 6 is started. After the coolant temperature in the heat exchanger 3 meets the vaporization requirement, the second circulation pump 011 is turned on, and the gas in the first boost outlet pipeline 012, the first boost return pipeline 013, the second boost outlet pipeline 014 and the second boost return pipeline 015 circulates internally, completing the "low-temperature gas enters the heat exchanger and then heats up - high-temperature gas enters the two gas cylinders - two gas cylinders are pressurized - gas cools down - gas enters the heat exchanger and then heats up" cycle. After the cylinders are pressurized, normal gas use can be carried out.

[0063] The following is a specific introduction to the process of "low-temperature gas enters the heat exchanger and then heats up - high-temperature gas enters the two gas cylinders - the two gas cylinders are pressurized - the gas is cooled - the gas enters the heat exchanger and then heats up": the low-temperature gas in the first gas cylinder 4 and the second gas cylinder 5 enters the first pipeline 016 through the first pressurized gas outlet pipeline 012 and the second pressurized gas return pipeline 015 respectively, and enters the heat exchanger 3 through the air inlet 34. After the gas is heated up, the high-temperature gas discharged from the second gas outlet 32 ​​enters the second pipeline 019 through the second circulation pump 011 and the third valve 8, and enters the first gas cylinder 4 and the second gas cylinder 5 through 017 and 018 respectively. The first gas cylinder 4 and the second gas cylinder 5 are pressurized and the gas is cooled. Subsequently, the low-temperature gas in the first gas cylinder 4 and the second gas cylinder 5 enters the first pipeline 016 through the first pressurized gas outlet pipeline 012 and the second pressurized gas return pipeline 015 respectively, and the cycle continues.

[0064] In the above functions, the third valve 8 is located between the heat exchanger 3 and the main unit 050, and its function is to control whether the first air outlet 31 of the heat exchanger 3 is connected to the main unit 050; the third one-way valve 10 is located on the second air outlet pipeline 9, and its function is to enable the gas discharged from the second air outlet 32 ​​of the heat exchanger 3 to flow to the main unit 050 in one direction; the fourth valve 017 corresponds to the first gas cylinder 4, and is used to control the connection and disconnection of the second pipeline 019 and the first pressurized return air pipeline 013; the fifth valve 018 corresponds to the second gas cylinder 5, and is used to control the connection and disconnection of the second pipeline 019 and the second pressurized outlet pipeline 014.

[0065] In summary, the hydrogen supply system in the above embodiment has system filling function, system air return / manual venting function, cold start gas function, normal gas function, boost gas function, cold start boost function, etc., and can use engine circulation heat or electric heating circulation heat for vaporization or boosting, and is suitable for a variety of working conditions, especially cold start boost function, and can meet the corresponding working conditions requirements at low liquid level / low pressure / cold start.

[0066] In some embodiments, Figure 1 As shown, the heating component 6 includes an eighth valve 61, a heater 62 and a circulation pump 63. The inlet and outlet of the eighth valve 61 are respectively connected to the condensate outlet and the condensate inlet of the heat exchanger 3; the heater 62 and the circulation pump 63 are connected in series, and the heater 62 and the circulation pump 63 are connected in parallel with the eighth valve 61 as a whole. The heater 62 can heat the condensate discharged from the heat exchanger 3.

[0067] Specifically, when in use, the condensate discharged from the condensate outlet of the heat exchanger 3 first enters the pipeline between the eighth valve 61 and the heater 62. A part of the condensate can flow back from the eighth valve 61 to the condensate inlet of the heat exchanger 3, and the other part enters the circulation pump 63 from the heater 62, and then enters the condensate inlet of the heat exchanger 3, thereby achieving the function of heating the condensate in the cold start gas function and the cold start boost function. After the temperature and flow rate of the coolant in the heat exchanger meet the vaporization requirements, the eighth valve 61, the heater 62 and the circulation pump 63 are closed, and the heat of the main engine 050 circulation is used to heat the condensate to complete the vaporization process.

[0068] When the heating component 6 is in use, the eighth valve 61 can be in an open state or a closed state, so as to adjust the heating effect of the heating component 6 on the condensate. When the eighth valve 61 is in a closed state, the heating effect is best.

[0069] The eighth valve 61 may be a solenoid valve, which is convenient for personnel to control.

[0070] In some embodiments, Figure 1As shown, the first gas cylinder 4 is connected to a first filling pipeline 020 , and a first stop valve 021 is provided on the first filling pipeline 020 . The first stop valve 021 can control the opening and closing of the first filling pipeline 020 .

[0071] When the first stop valve 021 is closed, liquid hydrogen cannot enter the first gas cylinder 4 from the liquid filling port 1 ; when the first stop valve 021 is opened, liquid hydrogen can enter the first gas cylinder 4 from the liquid filling port 1 .

[0072] In some embodiments, Figure 1 As shown, the second gas cylinder 5 is connected to a second filling pipeline 022 , and a second stop valve 023 is provided on the second filling pipeline 022 . The second stop valve 023 can control the opening and closing of the second filling pipeline 022 .

[0073] When the second stop valve 023 is closed, liquid hydrogen cannot enter the second gas cylinder 5 from the liquid filling port 1 ; when the second stop valve 023 is opened, liquid hydrogen can enter the second gas cylinder 5 from the liquid filling port 1 .

[0074] When the first gas cylinder 4 is connected to the first filling pipeline 020 and the second gas cylinder 5 is connected to the second filling pipeline 022, as shown in FIG. Figure 1 As shown, the end of the second filling pipeline 022 away from the second gas cylinder 5 and the end of the first filling pipeline 020 away from the first gas cylinder 4 are connected to the same filling port 1, and the cryogenic liquid can enter the first gas cylinder 4 and the second gas cylinder 5 respectively from the filling port 1 through the first stop valve 021 and the second stop valve 023 to complete the filling process.

[0075] In the above embodiment, the first filling pipeline 020 and the second filling pipeline 022 share the same filling port 1, which can simplify the pipeline structure, increase the system integration level, and facilitate the layout of the entire vehicle.

[0076] In some embodiments, Figure 1 As shown, the first gas cylinder 4 is connected to the first gas phase pipeline 024 , and the first gas phase pipeline 024 is provided with a third stop valve 025 , and the third stop valve 025 can control the on-off of the first gas phase pipeline 024 .

[0077] When the third stop valve 025 is closed, the overpressure gas in the first gas cylinder 4 cannot be discharged / recovered from the first gas return port 2; when the third stop valve 025 is opened, the overpressure gas in the first gas cylinder 4 can be discharged / recovered from the first gas return port 2.

[0078] In some embodiments, Figure 1 As shown, the second gas cylinder 5 is connected to a second gas phase pipeline 026 , and a fourth stop valve 027 is provided on the second gas phase pipeline 026 . The fourth stop valve 027 can control the on-off of the second gas phase pipeline 026 .

[0079] When the fourth stop valve 027 is closed, the overpressure gas in the second gas cylinder 5 cannot be discharged / recovered from the first return gas port 2; when the fourth stop valve 027 is opened, the overpressure gas in the second gas cylinder 5 can be discharged / recovered from the first return gas port 2.

[0080] When the first gas cylinder 4 is connected to the first gas phase pipeline 024 and the second gas cylinder 5 is connected to the second gas phase pipeline 026, the end of the second gas phase pipeline 026 facing away from the second gas cylinder 5 and the end of the first gas phase pipeline 024 facing away from the first gas cylinder 4 are connected to the same return gas port 2, and the overpressure gas in the first gas cylinder 4 and the second gas cylinder 5 is discharged / recovered from the return gas port 2 through the third stop valve 025 and the fourth stop valve 027 respectively, completing the gas return function.

[0081] In the above embodiment, the first gas phase pipeline 024 and the second gas phase pipeline 026 share the same gas return port 2, which can also simplify the pipeline structure and facilitate the layout of the entire vehicle.

[0082] In some embodiments, when the first gas cylinder 4 includes a first filling pipeline 020, the first filling pipeline 020 is connected to the first centralized release port 028 through a first discharge pipeline 029, and the first discharge pipeline 029 is provided with a first safety valve 030. When the gas pressure in the first filling pipeline 020 exceeds a preset value, the gas can be discharged from the first centralized release port 028 through the first safety valve 030.

[0083] The first safety valve 030 can ensure the stability of the air pressure in the first filling pipeline 020 and avoid overpressure in the first filling pipeline 020 .

[0084] In some embodiments, a second discharge pipeline 031 is connected between the first gas phase pipeline 024 and the first centralized discharge port 028, and the second discharge pipeline 031 is provided with a second safety valve 032. The second safety valve 032 can play a role in ensuring the stability of the gas pressure in the first gas phase pipeline 024. When the gas pressure in the first gas phase pipeline 024 exceeds a preset value, the gas can be discharged from the first centralized discharge port 028 through the second safety valve 032.

[0085] In some embodiments, a third discharge pipeline 033 is connected between the second pipeline 019 and the first centralized discharge port 028, and the third discharge pipeline 033 is provided with a third safety valve 034. The third safety valve 034 can play a role in ensuring the stability of the air pressure in the second pipeline 019. When the air pressure in the second pipeline 019 exceeds a preset value, the gas can be discharged from the first centralized discharge port 028 through the third safety valve 034.

[0086] In the above embodiments, the first discharge pipeline 029, the second discharge pipeline 031 and the third discharge pipeline 033 are all connected to the first centralized discharge port 028, and the gas discharge is controlled by the safety valves on each of them, so that the pipeline structure of the above hydrogen supply system is simpler and the safe operation of the system is ensured.

[0087] In some embodiments, Figure 1 As shown, the first liquid outlet pipeline 035 is provided with a first valve assembly 036 for controlling the on-off and flow state of the first liquid outlet pipeline 035 , and the end of the first liquid outlet pipeline 035 away from the first gas cylinder 4 is connected to the fuel inlet 33 of the heat exchanger 3 .

[0088] In the normal gas use function state, the third valve 8 is opened, and the fourth valve 017 and the fifth valve 018 are closed. The cryogenic liquid in the first gas cylinder 4 can enter the fuel liquid inlet 33 of the heat exchanger 3 from the first valve assembly 036 in the first liquid outlet pipeline 035. The cryogenic liquid is vaporized by the heat exchanger 3 to become gas that meets the requirements of the host 050, and is discharged to the first gas outlet pipeline 7 through the first gas outlet 31, and then supplies gas to the host 050 through the third valve 8.

[0089] Among them, the first valve assembly 036 may include a first valve, a first one-way valve and a first overflow valve, and the first valve, the first one-way valve and the first overflow valve are arranged in sequence on the first liquid outlet pipeline 035 in a direction gradually approaching the fuel inlet 33.

[0090] When the first valve is opened, the cryogenic liquid in the first liquid outlet pipeline 035 is allowed to pass through, and when the first valve is closed, the cryogenic liquid in the first liquid outlet pipeline 035 is not allowed to pass through; the first one-way valve can prevent the cryogenic liquid from flowing back to the first gas cylinder 4; the first overflow valve can allow the over-pressure cryogenic liquid to leak out from the bypass.

[0091] In some embodiments, Figure 1 As shown, when the first gas cylinder 4 is connected with the first liquid outlet pipeline 035, the end of the first liquid outlet pipeline 035 away from the first gas cylinder 4 can be connected to the connection point between the first gas phase pipeline 024 and the second discharge pipeline 031, and a sixth valve 037 is provided between the connection point between the first gas phase pipeline 024 and the second discharge pipeline 031 and the end of the first liquid outlet pipeline 035 away from the first gas cylinder 4. The sixth valve 037 can control the connection state between the first gas phase pipeline 024 and the first liquid outlet pipeline 035. When the gas cylinder is over-pressured, in a safe situation, manual emptying can be omitted first, and the sixth valve 037 can be opened, and the over-pressure gas in the first gas phase pipeline 024 and the low-temperature liquid in the first liquid outlet pipeline 035 are mixed and then vaporized through the heat exchanger 3 and enter the main unit for use.

[0092] The above method makes the hydrogen supply system more economical and practical, and reduces the waste of resources.

[0093] Among them, the sixth valve 037 can be a solenoid valve, which is convenient for personnel to control it.

[0094] In some embodiments, Figure 1 As shown, when the second gas cylinder 5 includes the second gas phase pipeline 026, the second gas phase pipeline 026 is connected to the second centralized release port 038 through the fourth discharge pipeline 039, and the fourth discharge pipeline 039 is provided with a fourth safety valve 040. When the gas pressure in the second gas phase pipeline 026 exceeds a preset value, the gas can be discharged from the second centralized release port 038 through the fourth safety valve 040.

[0095] The arrangement of the first centralized relief port 028 and the second centralized relief port 038 can realize automatic pressure relief of the system. The second centralized relief port 038 can be the same relief port as the first centralized relief port 028, or different relief ports can be used.

[0096] In some embodiments, when the second gas cylinder 5 includes a second filling pipeline 022, a fifth discharge pipeline 041 is connected between the second filling pipeline 022 and the second centralized release port 038, and the fifth discharge pipeline 041 is provided with a fifth safety valve 042. When the gas pressure in the second filling pipeline 022 exceeds a preset value, the gas can be discharged from the second centralized release port 038 through the fifth safety valve 042.

[0097] In the above embodiments, the fourth discharge pipeline 039 and the fifth discharge pipeline 041 are both connected to the second centralized discharge port 038, and the gas discharge is controlled by the safety valves on each of them, so that the pipeline structure of the above hydrogen supply system is simpler and the safe operation of the system is ensured.

[0098] In some embodiments, Figure 1 As shown, when the second gas cylinder 5 includes the second gas phase pipeline 026 , the second gas phase pipeline 026 is connected to the fuel liquid inlet 33 of the heat exchanger 3 through the exhaust pipeline 043 , and the exhaust pipeline 043 is provided with a seventh valve 044 .

[0099] When the gas cylinder is over-pressured, under safe conditions, you can open the sixth valve 037 / seventh valve 044 (or open them at the same time, as needed) without manually venting it. When the sixth valve 037 is opened, close the third stop valve 025 and the second safety valve 032 to prevent the first gas phase pipeline 024 from returning gas and releasing gas; when the seventh valve 044 is opened, close the fourth stop valve 027 and the fourth safety valve 040 to prevent the second gas phase pipeline 026 from returning gas and releasing gas. Take the simultaneous opening of the sixth valve 037 and the seventh valve 044 as an example: the over-pressure gas in the first gas phase pipeline 024 and the second gas phase pipeline 026 is mixed with the low-temperature liquid in the first liquid outlet pipeline 035 and the second liquid outlet pipeline 045 respectively, and then is vaporized by the upper vaporizer in the heat exchanger 3 and enters the main engine 050 for use. This is an economical gas use function.

[0100] The above method makes the hydrogen supply system more economical and practical, and reduces the waste of resources.

[0101] It should be noted that, in the cold start gas use function and the normal gas use function state, the sixth valve 037 and the seventh valve 044 are both in the closed state.

[0102] In some embodiments, Figure 1 As shown, the second liquid outlet pipeline 045 is provided with a second valve assembly 046 for controlling the on-off and flow state of the second liquid outlet pipeline 045 , and the end of the second liquid outlet pipeline 045 away from the second gas cylinder 5 is connected to the fuel inlet 33 of the heat exchanger 3 .

[0103] When in use, the cryogenic liquid in the second gas cylinder 5 can enter the fuel liquid inlet 33 of the heat exchanger 3 from the second valve assembly 046 in the second liquid outlet pipeline 045 .

[0104] The second valve assembly 046 may include a second valve, a second one-way valve and a second overflow valve, which are arranged in sequence on the second liquid outlet pipeline 045 in a direction gradually approaching the fuel inlet 33 .

[0105] When the second valve is opened, the cryogenic liquid in the second liquid outlet pipeline 045 is allowed to pass through, and when the second valve is closed, the cryogenic liquid in the second liquid outlet pipeline 045 is not allowed to pass through; the second one-way valve can prevent the cryogenic liquid from flowing back to the second gas cylinder 5; the second overflow valve can allow the over-pressure cryogenic liquid to leak out from the bypass.

[0106] In some embodiments, Figure 1 As shown, the hydrogen supply system also includes a hydrogen supply main line 047, one end of which is connected to the first gas outlet line 7 and the second gas outlet line 9, and the other end is provided with a buffer tank 048 and a gas supply group valve 049 in sequence and is used to communicate with the main engine 050.

[0107] Since the second circulation pump 011 is connected in parallel on both sides of the third one-way valve 10 , the second circulation pump 011 is also connected to the end of the hydrogen supply main line 047 away from the main engine 050 .

[0108] Among them, the gas supply valve group 049 may include a pressure sensor, a solenoid valve, a pressure regulating valve and a temperature sensor, and the pressure sensor, the solenoid valve, the pressure regulating valve and the temperature sensor are spaced apart on the hydrogen supply main line 047 in a direction gradually away from the buffer tank 048 .

[0109] Among them, the pressure sensor can measure the gas pressure in the hydrogen supply main line 047, the solenoid valve can control the on-off of the hydrogen supply main line 047; the pressure regulating valve can adjust the pressure of the gas output from the hydrogen supply main line 047; and the temperature sensor can measure the gas temperature in the hydrogen supply main line 047.

[0110] The pressure sensor, solenoid valve, pressure regulating valve and temperature sensor can be integrated into the same component to improve the system integration.

[0111] It should be noted that usually the third valve 8, the fourth valve 017 and the fifth valve 018 are not closed at the same time. In order to avoid safety hazards under malfunction or misoperation conditions, the above hydrogen supply system is provided with a third safety valve 034 to vent overpressure gas.

[0112] The hydrogen supply system provided in the above embodiment has the following advantages:

[0113] 1. The hydrogen supply system of the above embodiment can be arranged on both sides of the automobile frame or on the upper side of the frame, and a double gas cylinder arrangement is adopted to meet the requirements of long-distance transportation and heavy load.

[0114] 2. The first gas cylinder 4 and the second gas cylinder 5 share the filling, gas return, vaporization, pressurization, gas supply and other pipelines, which effectively improves the pipeline utilization rate, facilitates the integration of the hydrogen supply system and the layout of the whole vehicle, and the electrical components are centrally controlled, which also improves the degree of integration;

[0115] 3. The hydrogen supply system of the above embodiment uses circulating gas to control the liquid hydrogen pressure in the gas cylinder, which can be controlled by two cylinders or one cylinder, thus solving the problem of pressurizing the gas cylinder;

[0116] 4. The hydrogen supply system of the above embodiment uses the engine cycle heat or electric heating cycle heat for vaporization or pressurization, and is applicable to various working conditions;

[0117] 5. The hydrogen supply system of the above embodiment is highly versatile and can be applied to double-side / double-layer / single-layer + single-side system, and three-bottle system. Similarly, the above-mentioned pressurization method No. 4 is also applicable to the single-bottle system.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrogen supply system, characterized in that: It comprises a first gas cylinder (4) and a second gas cylinder (5) which share the same liquid filling port (1), gas return port (2) and heat exchanger (3); The heat exchanger (3) is connected to a heating component (6) for heating the coolant in the heat exchanger (3); the first air outlet (31) of the heat exchanger (3) is connected to a first air outlet pipeline (7); a third valve (8) is provided on the first air outlet pipeline (7); the third valve (8) is used to communicate with the main engine (050); the second air outlet (32) of the heat exchanger (3) is connected to a second air outlet pipeline (9); a third one-way valve (10) is provided on the second air outlet pipeline (9); and a second circulation pump (011) is connected in parallel on both sides of the third one-way valve (10); The first gas cylinder (4) is connected to a first pressurized gas outlet pipeline (012), a first pressurized gas return pipeline (013) and a first liquid outlet pipeline (035); the second gas cylinder (5) is connected to a second pressurized gas outlet pipeline (014), a second pressurized gas return pipeline (015) and a second liquid outlet pipeline (045); The first pressurized air outlet pipeline (012) is connected to the second pressurized air return pipeline (015), and the connection point between the first pressurized air outlet pipeline (012) and the second pressurized air return pipeline (015) is connected to the air inlet (34) of the heat exchanger (3) through the first pipeline (016); The first pressurized return air pipeline (013) is in communication with the second pressurized outlet air pipeline (014), and a fourth valve (017) and a fifth valve (018) are provided therebetween; one end of the second pipeline (019) is connected between the fourth valve (017) and the fifth valve (018); the other end of the second pipeline (019) is in communication with the first outlet port (31) of the heat exchanger (3) and the first outlet air pipeline (7) between the third valve (8); The first liquid outlet pipeline (035) and the second liquid outlet pipeline (045) are both in communication with the fuel liquid inlet (33) of the heat exchanger (3).

2. The hydrogen supply system according to claim 1, characterized in that: The heating component (6) comprises an eighth valve (61), a heater (62) and a circulation pump (63); The inlet and outlet of the eighth valve (61) are respectively connected to the condensate outlet and the condensate inlet of the heat exchanger (3); The heater (62) and the circulation pump (63) are connected in series, and the heater (62) and the circulation pump (63) are connected in parallel with the eighth valve (61) as a whole.

3. The hydrogen supply system according to claim 1, characterized in that: The first gas cylinder (4) is connected to a first filling pipeline (020), and the first filling pipeline (020) is provided with a first stop valve (021); The second gas cylinder (5) is connected to a second filling pipeline (022), on which a second stop valve (023) is provided; an end of the second filling pipeline (022) facing away from the second gas cylinder (5) and an end of the first filling pipeline (020) facing away from the first gas cylinder (4) are connected to the same liquid filling port (1).

4. The hydrogen supply system according to claim 3, characterized in that: The first gas cylinder (4) is connected to a first gas phase pipeline (024), and a third stop valve (025) is provided on the first gas phase pipeline (024); The second gas cylinder (5) is connected to a second gas phase pipeline (026), on which a fourth stop valve (027) is provided. The end of the second gas phase pipeline (026) facing away from the second gas cylinder (5) and the end of the first gas phase pipeline (024) facing away from the first gas cylinder (4) are connected to the same gas return port (2).

5. The hydrogen supply system according to claim 4, characterized in that: The first filling pipeline (020) is connected to the first centralized release port (028) through a first discharge pipeline (029), and the first discharge pipeline (029) is provided with a first safety valve (030); A second discharge pipeline (031) is connected between the first gas phase pipeline (024) and the first centralized discharge port (028), and the second discharge pipeline (031) is provided with a second safety valve (032); A third discharge pipeline (033) is connected between the second pipeline (019) and the first centralized discharge port (028), and the third discharge pipeline (033) is provided with a third safety valve (034).

6. The hydrogen supply system according to claim 5, characterized in that: The first liquid outlet pipeline (035) is provided with a first valve assembly (036) for controlling the on / off state and flow state of the first liquid outlet pipeline (035); The end of the first liquid outlet pipeline (035) facing away from the first gas cylinder (4) is connected to the connecting point of the first gas phase pipeline (024) and the second discharge pipeline (031), and a sixth valve (037) is provided between the connecting point of the first gas phase pipeline (024) and the second discharge pipeline (031) and the end of the first liquid outlet pipeline (035) facing away from the first gas cylinder (4).

7. The hydrogen supply system according to claim 4, characterized in that: The second gas phase pipeline (026) is connected to the second centralized release port (038) via a fourth release pipeline (039), and the fourth release pipeline (039) is provided with a fourth safety valve (040); A fifth discharge pipeline (041) is connected between the second filling pipeline (022) and the second centralized discharge port (038), and the fifth discharge pipeline (041) is provided with a fifth safety valve (042).

8. The hydrogen supply system according to claim 4, characterized in that: The second gas phase pipeline (026) is connected to the fuel liquid inlet (33) of the heat exchanger (3) through an exhaust pipe (043), and the exhaust pipe (043) is provided with a seventh valve (044).

9. The hydrogen supply system according to claim 1, characterized in that: The second liquid outlet pipeline (045) is provided with a second valve assembly (046) for controlling the on / off state and flow state of the second liquid outlet pipeline (045).

10. The hydrogen supply system according to any one of claims 1 to 9, characterized in that: It also includes a main hydrogen supply line (047), one end of which is connected to the first gas outlet line (7) and the second gas outlet line (9), and the other end of which is provided with a buffer tank (048) and a gas supply valve group (049) in sequence and is used to communicate with the main engine (050).

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