Hydrogen supply system

Abstract

The application provides a hydrogen supply system and relates to the technical field of new energy vehicles.The hydrogen supply system comprises a first gas cylinder and a second gas cylinder which share a same liquid filling port, a gas return port and a heat exchanger;the heat exchanger is connected with a heating assembly;the heat exchanger is connected with a first gas outlet pipeline;the first gas outlet pipeline is provided with a third valve;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;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;the first pressurized gas outlet pipeline and the second pressurized gas return pipeline are connected with the gas inlet of the heat exchanger through a first pipeline;the first pressurized gas return pipeline and the second pressurized gas outlet pipeline are provided with a fourth valve and a fifth valve;the fourth valve and the fifth valve are connected with one end of a second pipeline;the other end of the second pipeline is connected with the first gas outlet pipeline.The hydrogen supply system has the advantages of high integration degree and can meet the use requirements of the main machine under various working conditions.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, and in particular to a hydrogen supply system. Background Technology

[0002] The hydrogen energy industry chain can be divided into three aspects: upstream hydrogen production, 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 vaporizing liquid hydrogen, it is supplied to fuel cells or internal combustion engines, requiring the hydrogen supply system to be positioned above the vehicle's frame or on its side. Depending on the vehicle's operating conditions, scenarios such as long-distance transportation, heavy-duty vehicles, and high-power generators place high demands on the hydrogen storage capacity of hydrogen storage containers. In these cases, single-cylinder hydrogen storage containers are insufficient. Therefore, the rational, efficient, and intelligent arrangement of dual-side or double-layer container systems is particularly important for large-capacity hydrogen supply systems. Simultaneously, the pressurization of cryogenic liquids, especially before generator startup / at low liquid levels / low pressure, has long plagued the use of gas supply systems. Therefore, a reasonable and effective pressurization method has also become an important issue that gas supply systems need to address.

[0003] When using a dual-cylinder system with cylinders arranged on both sides of the vehicle frame, the traditional solution is to use a separate set of filling, return, vaporization, pressurization, and supply pipelines for each cylinder. The traditional pressurization solution uses a liquid medium to exchange heat with circulating water and then return the gas to the cylinder, or uses vaporized gas to return the gas to the cylinder and then enter the main unit.

[0004] Therefore, the traditional solution has the following shortcomings: 1. The method of using a separate pipeline for a single gas cylinder has low integration and occupies space in the vehicle layout; 2. The pressurization method of returning the liquid phase to the gas phase after vaporization prolongs the pressurization 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 exchanging heat with the low-temperature liquid in the gas cylinder, the gas cools down and then enters the carburetor to be heated before entering the main unit. This method cannot be operated when the vehicle is stopped, that is, pressurization cannot be performed when the vehicle is stopped, and the pressurization effect is poor at low liquid level, affecting the gas supply of the main unit. Summary of the Invention

[0005] The purpose of this invention is to provide a hydrogen supply system that has advantages such as high integration and the ability to meet the needs of the host machine under various operating conditions.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a hydrogen supply system, comprising a first gas cylinder and a second gas cylinder sharing the same filling port, return port, and heat exchanger;

[0008] The heat exchanger is connected to a heating component for heating the coolant inside the heat exchanger. The first outlet of the heat exchanger is connected to a first outlet pipeline. A third valve is provided on the first outlet pipeline. The third valve is used to connect to the main unit. The second outlet of the heat exchanger is connected to a second outlet pipeline. A third check valve is provided on the second outlet pipeline. A second circulation pump is connected in parallel on both sides of the third check valve.

[0009] The first gas cylinder is connected to a first pressurized gas outlet line, a first pressurized gas return line, and a first liquid outlet line; the second gas cylinder is connected to a second pressurized gas outlet line, a second pressurized gas return line, and a second liquid outlet line.

[0010] The first pressurized gas outlet pipeline is connected to the second pressurized gas return pipeline, and the connection between the first pressurized gas outlet pipeline and the second pressurized gas return pipeline is connected to the gas inlet of the heat exchanger through the first pipeline.

[0011] The first pressurized return gas pipeline is connected to the second pressurized outlet gas pipeline and is provided with a fourth valve and a fifth valve between them. The fourth valve and the fifth valve are connected to one end of the second pipeline, and the other end of the second pipeline is connected to the first outlet gas pipeline between the first outlet of the heat exchanger and the third valve.

[0012] Both the first liquid outlet pipe and the second liquid outlet pipe are connected to the fuel inlet of the heat exchanger.

[0013] Furthermore, 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 condensate inlet of the heat exchanger;

[0015] The heater and the circulating pump are connected in series, and the heater and the circulating pump are connected in parallel with the eighth valve.

[0016] Furthermore, the first gas cylinder is connected to a first filling pipeline, and a first shut-off valve is provided on the first filling pipeline;

[0017] The second gas cylinder is connected to a second filling pipeline, which is equipped with a second shut-off valve. The end of the second filling pipeline opposite to the second gas cylinder and the end of the first filling pipeline opposite to 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 shut-off valve is provided on the first gas phase pipeline;

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

[0020] Furthermore, the first filling pipeline is connected to the first centralized vent through the first venting pipeline, and the first venting pipeline is equipped with a first safety valve;

[0021] A second venting pipeline is connected between the first gas phase pipeline and the first centralized vent, and the second venting pipeline is equipped with a second safety valve;

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

[0023] Furthermore, the first outlet pipeline is provided with a first valve assembly for controlling the opening and closing of the first outlet pipeline and the flow rate.

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

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

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

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

[0028] Furthermore, the second outlet pipeline is equipped with a second valve assembly for controlling the on / off state of the second outlet pipeline and the flow rate.

[0029] Furthermore, it also includes a hydrogen supply main pipeline, one end of which is connected to the first and second gas outlet pipelines, and the other end is provided with a buffer tank and a gas supply valve in sequence for connecting to the main unit.

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

[0031] The aforementioned 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 return gas / manual venting function: Overpressure gas in the first and second gas cylinders is discharged / recovered from the same return gas port to complete the return gas function.

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

[0035] 4) Normal gas usage function: After the temperature of the coolant in the heat exchanger meets the vaporization requirements, the heating components are turned off, and the heat from the main unit circulation is used to heat the liquid to complete the liquid hydrogen vaporization process.

[0036] 5) Gas Boosting Function: When the gas phase pressure in the first and / or second gas cylinders is low, the pressure after vaporization does not meet the requirements of the main unit. In this case, the gas cylinders need to be pressurized. The third valve is closed, and the fourth and / or fifth valves are opened (single-valve pressurization for a single cylinder, double-valve pressurization for both cylinders). The heating components are in the off state. Taking double-valve pressurization as an example, the high-temperature gas vaporized by the heat exchanger flows through the first and second gas cylinders, heating the liquids inside and increasing their pressure. This increases the pressure in both cylinders to meet the pressure requirements of the main unit (at this time, the gas temperature flowing out of the two cylinders decreases). The low-temperature gas, after being heated by the heat exchanger, flows through the third one-way valve into subsequent components and then into the main unit, completing the gas boosting function (both boosting the gas cylinders and continuously supplying gas to the main unit). Pressurization can also be achieved by opening the third valve, but the boosting efficiency is lower than that by closing the third valve.

[0037] 6) Cold Start Boost Function: When the vehicle is cold-started, if the pressure inside the cylinder is insufficient, the above-mentioned 3) Cold Start Gas Use Function and 5) Boost Gas Use Function cannot be performed. At this time, the Cold Start Boost Function is activated: the third valve, the fourth valve, and the fifth valve are opened, the first gas cylinder and the second gas cylinder do not discharge cryogenic liquid, the heating component is activated, and after the temperature of the coolant in the heat exchanger meets the vaporization requirements, the second circulation pump is activated, and the gas in the first boost gas outlet line, the first boost gas return line, the second boost gas outlet line, and the second boost gas return line circulates internally, completing the cycle of "cryogenic gas enters the heat exchanger and heats up - high temperature gas enters at least one of the two gas cylinders - corresponding gas cylinder is pressurized - gas is cooled down - gas enters the heat exchanger and heats up". After the gas cylinder is pressurized, normal gas use can be performed.

[0038] Compared to existing technologies, the hydrogen supply system provided by this invention allows the first and second gas cylinders to share the same filling port, return port, centralized venting port, and heat exchanger. Its compact structure and high degree of integration facilitate vehicle layout. Furthermore, the aforementioned hydrogen supply system uses gas heating to pressurize the cylinders, meeting the main unit's operating requirements under various vehicle conditions. In particular, the cold start pressurization function can meet the corresponding operating conditions under low liquid level / low pressure / cold start conditions. Attached Figure Description

[0039] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

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

[0041] Icons: 1 - Filling port; 2 - Return gas port; 3 - Heat exchanger; 31 - First gas outlet; 32 - Second gas outlet; 33 - Fuel inlet; 34 - Gas inlet; 4 - First gas cylinder; 5 - Second gas cylinder; 6 - Heating assembly; 61 - Eighth valve; 62 - Heater; 63 - Circulation pump; 7 - First gas outlet pipeline; 8 - Third valve; 9 - Second gas outlet pipeline; 10 - Third check valve; 011 - Second circulation pump; 012 - First pressurized gas outlet pipeline; 013 - First pressurized return gas pipeline; 014 - Second pressurized gas outlet pipeline; 015 - Second pressurized return gas pipeline; 016 - First pipeline; 017 - Fourth valve; 018 - Fifth valve; 019 - Second pipeline; 020 - First filling pipeline; 021 - First shut-off valve; 022 - Second filling pipeline; 023 - Second shut-off valve; 02 4 - First gas phase pipeline; 025 - Third shut-off valve; 026 - Second gas phase pipeline; 027 - Fourth shut-off valve; 028 - First centralized vent; 029 - First vent pipeline; 030 - First safety valve; 031 - Second vent pipeline; 032 - Second safety valve; 033 - Third vent pipeline; 034 - Third safety valve; 035 - First liquid outlet pipeline; 036 - First valve assembly; 037 - Sixth valve; 038 - Second centralized vent; 039 - Fourth vent pipeline; 040 - Fourth safety valve; 041 - Fifth vent 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 group valve; 050 - Main unit. Detailed Implementation

[0042] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

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

[0047] The heat exchanger 3 is connected to a heating component 6 for heating the coolant inside the heat exchanger 3. The first outlet 31 of the heat exchanger 3 is connected to a first outlet pipe 7. A third valve 8 is provided on the first outlet pipe 7. The third valve 8 is used to connect to the main unit 050. The second outlet 32 ​​of the heat exchanger 3 is connected to a second outlet pipe 9. A third check valve 10 is provided on the second outlet pipe 9. A second circulation pump 011 is connected in parallel on both sides of the third check valve 10.

[0048] The first gas cylinder 4 is connected to the first pressurized gas outlet line 012, the first pressurized gas return line 013 and the first liquid outlet line 035, and the second gas cylinder 5 is connected to the second pressurized gas outlet line 014, the second pressurized gas return line 015 and the second liquid outlet line 045.

[0049] The first booster outlet pipe 012 is connected to the second booster return pipe 015, and the connection between the first booster outlet pipe 012 and the second booster return pipe 015 is connected to the air inlet 34 of the heat exchanger 3 through the first pipe 016.

[0050] The first pressurized return gas pipeline 013 is connected to the second pressurized outlet gas pipeline 014 and is provided with a fourth valve 017 and a fifth valve 018 between them. 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 gas pipeline 7 between the first outlet 31 of the heat exchanger 3 and the third valve 8.

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

[0052] In the hydrogen supply system provided in the above embodiments, the first gas cylinder 4 and the second gas cylinder 5 can share the same filling port 1, return gas port 2, and heat exchanger 3, and can even share the same centralized vent. This requires the two gas cylinders to share more pipelines, improving pipeline utilization. Compared to the existing technology where each gas cylinder uses a separate set of pipelines, the structure is more compact, facilitating the integration of the hydrogen supply system and the overall vehicle layout, which is beneficial for vehicle weight reduction. At the same time, electrical components can be centrally controlled, improving the degree of integration.

[0053] The aforementioned hydrogen supply system has the following functions in practical use:

[0054] 1) System filling function: Cryogenic liquid enters the first gas cylinder 4 and the second gas cylinder 5 from the same filling port 1 to complete the liquid hydrogen filling process.

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

[0056] 3) Cold Start Gas Function: When the vehicle is cold started (assuming the pressure meets the requirements), the coolant temperature in the heat exchanger 3 is insufficient to vaporize the cryogenic 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 activated. The heating component 6 heats the coolant in the heat exchanger 3. Once the coolant temperature and flow rate in the heat exchanger 3 meet the vaporization requirements, the cryogenic liquid in the first gas cylinder 4 and the second gas cylinder 5 is discharged from the first liquid outlet pipe 035 and the second liquid outlet pipe 045, respectively, and enters the fuel inlet 33 of the heat exchanger 3. After being vaporized by the heat exchanger 3, the cryogenic liquid becomes a gas that meets the requirements of the main unit 050. It is discharged through the first gas outlet 31 to the first gas outlet pipe 7, and flows into the subsequent components and into the main unit 050 through the third valve 8 on the first gas outlet pipe 7.

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

[0058] 5) Gas pressurization function: When the gas phase 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 main unit, and the gas cylinder needs to be pressurized. Close the third valve 8 and open the fourth valve 017 and / or the fifth valve 018 (single opening is for single-cylinder gas pressurization, double opening is for double-cylinder gas pressurization), and the heating component 6 is in the off state.

[0059] Taking a double-cylinder configuration as an example, the cryogenic liquid in the first cylinder 4 and the second cylinder 5 is discharged from the first liquid outlet pipe 035 and the second liquid outlet pipe 045 respectively, and enters the fuel inlet 33 of the heat exchanger 3. After being vaporized by the heat exchanger 3, the cryogenic liquid becomes a gas that meets the requirements of the main unit 050, and is discharged through the first gas outlet 31 to the first gas outlet pipe 7. Subsequently, the vaporized gas enters the first cylinder 4 and the second cylinder 5 respectively through the second pipe 019, the fourth valve 017 on the first pressurized return gas pipe 013, and the fifth valve 018 on the second pressurized outlet pipe 014, thereby purifying the liquid in the two cylinders. Heating increases the liquid pressure, thereby increasing the pressure in both gas cylinders to meet the pressure requirements of the main unit 050 (at this time, due to heat exchange between the vaporized gas and the liquid in the two gas cylinders, the temperature of the gas flowing out of the two gas cylinders decreases). The low-temperature gas flowing out of the first pressurized gas outlet pipe 012 and the second pressurized gas return pipe 015 enters the heat exchanger 3 through the inlet 34, is heated, and then flows out from the second outlet 32, enters the second outlet pipe 9, and then flows into the subsequent components through the third one-way valve 10 and into the main unit 050, completing the pressurized gas supply function (both pressurizing the gas cylinders and continuously supplying gas to the main unit 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 pipe 035 and enters the fuel inlet 33 of the heat exchanger 3. The high-temperature gas vaporized in the heat exchanger 3 flows through the second pipe 019 and the fourth valve 017 through the first gas cylinder 4 to heat the liquid in the first gas cylinder 4, thereby increasing the liquid pressure and thus increasing the pressure of the first gas cylinder 4 to meet the pressure required by the main unit 050 (at this time, the temperature of the gas flowing out of the first gas cylinder 4 decreases). The low-temperature gas flowing out of the first pressurized gas outlet pipe 012 reaches the inlet 34 through the first pipe 016, enters the heat exchanger 3 for heating, and then flows out from the second outlet 32 ​​into the second outlet pipe 9, and then flows through the third one-way valve 10 into the subsequent components and into the main unit 050, completing the function of pressurizing gas (both pressurizing the gas cylinder and continuously supplying gas to the main unit 050).

[0061] Of the functions mentioned above, the third valve 8 can also be opened to increase pressure, but the pressure increase efficiency is worse than that of closing the third valve 8.

[0062] 6) Cold Start Boost Function: When the vehicle is cold-started, if the pressure inside the cylinder is insufficient, the above-mentioned 3) Cold Start Gas Use Function and 5) Boost Gas Use Function cannot be performed. At this time, the cold start boost function is activated: open the third valve 8, the fourth valve 017 and the fifth valve 018, 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 temperature of the coolant in the heat exchanger 3 meets the vaporization requirements, the second circulation pump 011 is started, and the gas in the first boost gas outlet pipe 012, the first boost gas return pipe 013, the second boost gas outlet pipe 014 and the second boost gas return pipe 015 circulate internally, completing the cycle of "low-temperature gas enters the heat exchanger and heats up - high-temperature gas enters the two gas cylinders - the two gas cylinders are pressurized - the gas cools down - the gas enters the heat exchanger and heats up". After the gas cylinder is pressurized, normal gas use can be performed.

[0063] The following is a detailed description of the process of "low-temperature gas entering the heat exchanger and heating up – high-temperature gas entering the two gas cylinders – pressurization of the two gas cylinders – gas cooling down – gas entering the heat exchanger and heating up again": 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 outlet pipeline 012 and the second pressurized return pipeline 015, respectively, and enters the heat exchanger 3 through the inlet 34. After the gas is heated up, the high-temperature gas discharged from the second 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 down. Then 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 outlet pipeline 012 and the second pressurized return pipeline 015, and so on.

[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 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 outlet pipeline 9, and its function is to allow the gas discharged from the second outlet 32 ​​of the heat exchanger 3 to flow unidirectionally to the main unit 050; the fourth valve 017 corresponds to the first gas cylinder 4 and is used to control the opening and closing of the second pipeline 019 and the first pressurized return gas pipeline 013; the fifth valve 018 corresponds to the second gas cylinder 5 and is used to control the opening and closing of the second pipeline 019 and the second pressurized outlet gas pipeline 014.

[0065] In summary, the hydrogen supply system in the above embodiments has functions such as system filling, system return / manual venting, cold start gas supply, normal gas supply, boosting gas supply, and cold start boosting. It can use engine circulating heat or electric heating circulating heat for vaporization or boosting, and is suitable for various operating conditions. In particular, the cold start boosting function can meet the requirements of the corresponding operating conditions when the liquid level / low pressure / cold start is low.

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

[0067] In practical use, the condensate discharged from the condensate outlet of heat exchanger 3 first enters the pipe between the eighth valve 61 and the heater 62. A portion of the condensate can flow back from the eighth valve 61 to the condensate inlet of heat exchanger 3, while the other portion enters the circulation pump 63 from the heater 62, and then enters the condensate inlet of heat exchanger 3. This achieves the heating of the condensate in the cold start gas supply and cold start pressurization functions. Once the coolant temperature and flow rate in the heat exchanger meet the vaporization requirements, the eighth valve 61, heater 62, and circulation pump 63 are closed. The heat from the main unit 050 circulation is then used to heat the condensate, completing the vaporization process.

[0068] When the heating component 6 is in use, the eighth valve 61 can be in either an open or closed state, thereby adjusting the heating effect of the heating component 6 on the condensate. The heating effect is best when the eighth valve 61 is in the closed state.

[0069] Among them, the eighth valve 61 can be a solenoid valve, which is convenient for personnel to control.

[0070] In some embodiments, such as Figure 1As shown, the first gas cylinder 4 is connected to the first filling pipeline 020, and the first filling pipeline 020 is equipped with a first shut-off valve 021, which can control the opening and closing of the first filling pipeline 020.

[0071] When the first shut-off valve 021 is closed, liquid hydrogen cannot enter the first gas cylinder 4 through the filling port 1; when the first shut-off valve 021 is open, liquid hydrogen can enter the first gas cylinder 4 through the filling port 1.

[0072] In some embodiments, such as Figure 1 As shown, the second gas cylinder 5 is connected to the second filling pipeline 022, and the second filling pipeline 022 is equipped with a second shut-off valve 023, which can control the opening and closing of the second filling pipeline 022.

[0073] When the second shut-off valve 023 is closed, liquid hydrogen cannot enter the second gas cylinder 5 through the filling port 1; when the second shut-off valve 023 is open, liquid hydrogen can enter the second gas cylinder 5 through the 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, such as 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. The cryogenic liquid can enter the first gas cylinder 4 and the second gas cylinder 5 from the filling port 1 through the first shut-off valve 021 and the second shut-off valve 023 respectively, to complete the filling process.

[0075] In the above embodiments, the first filling pipeline 020 and the second filling pipeline 022 share the same filling port 1, which simplifies the pipeline structure, increases the system integration level, and facilitates the overall vehicle layout.

[0076] In some embodiments, such as 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 equipped with a third shut-off valve 025, which can control the opening and closing of the first gas phase pipeline 024.

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

[0078] In some embodiments, such as Figure 1 As shown, the second gas cylinder 5 is connected to the second gas phase pipeline 026, and the second gas phase pipeline 026 is equipped with a fourth shut-off valve 027, which can control the opening and closing of the second gas phase pipeline 026.

[0079] When the fourth shut-off valve 027 is closed, the overpressure gas in the second gas cylinder 5 cannot be discharged / recovered from the first return port 2; when the fourth shut-off valve 027 is open, the overpressure gas in the second gas cylinder 5 can be discharged / recovered from the first return 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 away from the second gas cylinder 5 and the end of the first gas phase pipeline 024 away from the first gas cylinder 4 are connected to the same return gas port 2. 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 shut-off valve 025 and the fourth shut-off valve 027, respectively, to complete the return gas function.

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

[0082] In some embodiments, when the first gas cylinder 4 includes a first filling pipeline 020, the first filling pipeline 020 is connected to a first centralized vent 028 via a first vent pipeline 029, and the first vent 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 vent 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 prevent overpressure in the first filling pipeline 020.

[0084] In some embodiments, a second venting pipe 031 is connected between the first gas phase pipeline 024 and the first centralized venting port 028, and the second venting pipe 031 is equipped with a second safety valve 032. The second safety valve 032 can ensure 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 venting port 028 through the second safety valve 032.

[0085] In some embodiments, a third venting pipe 033 is connected between the second pipe 019 and the first centralized vent 028, and the third venting pipe 033 is equipped with a third safety valve 034. The third safety valve 034 can ensure the stability of the gas pressure in the second pipe 019. When the gas pressure in the second pipe 019 exceeds a preset value, the gas can be discharged from the first centralized vent 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 vent 028, and the gas discharge is controlled by the safety valve on each pipeline, which makes the pipeline structure of the hydrogen supply system simpler and ensures the safe operation of the system.

[0087] In some embodiments, such as Figure 1 As shown, the first liquid outlet pipeline 035 is provided with a first valve assembly 036 for controlling the opening and closing of the first liquid outlet pipeline 035 and the flow status. 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] Under normal gas usage conditions, the third valve 8 is open, 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 inlet 33 of the heat exchanger 3 through the first valve assembly 036 in the first liquid outlet pipeline 035. After being vaporized by the heat exchanger 3, the cryogenic liquid becomes a gas that meets the requirements of the main unit 050, and is discharged through the first gas outlet 31 to the first gas outlet pipeline 7, and then supplies gas to the main unit 050 through the third valve 8.

[0089] The first valve assembly 036 may include a first valve, a first check valve, and a first overflow valve. The first valve, the first check valve, and the first overflow valve are arranged sequentially at intervals on the first liquid outlet pipeline 035 in a direction that gradually approaches the fuel inlet 33.

[0090] When the first valve is open, cryogenic liquid in the first outlet line 035 is allowed to pass through; when the first valve is closed, cryogenic liquid in the first outlet line 035 is not allowed to pass through. The first check valve can prevent cryogenic liquid from flowing back to the first gas cylinder 4. The first overflow valve can allow overpressurized cryogenic liquid to leak out from the bypass.

[0091] In some embodiments, such as Figure 1 As shown, when the first gas cylinder 4 is connected to the first liquid outlet pipe 035, the end of the first liquid outlet pipe 035 away from the first gas cylinder 4 can be connected to the connection point of the first gas phase pipe 024 and the second vent pipe 031. A sixth valve 037 is provided between the connection point of the first gas phase pipe 024 and the second vent pipe 031 and the end of the first liquid outlet pipe 035 away from the first gas cylinder 4. The sixth valve 037 can control the connection state between the first gas phase pipe 024 and the first liquid outlet pipe 035. When the gas cylinder is overpressurized, under safe conditions, manual venting can be avoided initially. The sixth valve 037 can be opened, and the overpressurized gas in the first gas phase pipe 024 mixes with the cryogenic liquid in the first liquid outlet pipe 035, vaporizes after passing through the heat exchanger 3, and then enters the main unit for use.

[0092] The above methods make the hydrogen supply system more economical and practical, reducing resource waste.

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

[0094] In some embodiments, such as Figure 1 As shown, when the second gas cylinder 5 includes a second gas phase pipeline 026, the second gas phase pipeline 026 is connected to the second centralized vent 038 via a fourth vent pipeline 039, and the fourth vent pipeline 039 is equipped 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 vent 038 through the fourth safety valve 040.

[0095] The configuration of the first centralized vent 028 and the second centralized vent 038 enables automatic pressure relief of the system. The second centralized vent 038 can be the same vent as the first centralized vent 028, or it can be a different vent.

[0096] In some embodiments, when the second gas cylinder 5 includes a second filling pipeline 022, a fifth venting pipeline 041 is connected between the second filling pipeline 022 and the second centralized venting port 038, and the fifth venting 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 venting port 038 through the fifth safety valve 042.

[0097] In the above embodiments, the fourth venting pipeline 039 and the fifth venting pipeline 041 are both connected to the second centralized venting port 038, and the gas discharge is controlled by the safety valve on each pipeline, which makes the pipeline structure of the hydrogen supply system simpler and ensures the safe operation of the system.

[0098] In some embodiments, such as 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 inlet 33 of the heat exchanger 3 through the exhaust pipe 043, and the exhaust pipe 043 is equipped with a seventh valve 044.

[0099] When a gas cylinder is overpressurized, under safe conditions, manual venting can be delayed. Open the sixth valve 037 / seventh valve 044 (or both simultaneously, as needed). When the sixth valve 037 is open, close the third shut-off valve 025 and the second safety valve 032 to prevent backflow and venting in the first gas phase pipeline 024. When the seventh valve 044 is open, close the fourth shut-off valve 027 and the fourth safety valve 040 to prevent backflow and venting in the second gas phase pipeline 026. Taking the simultaneous opening of the sixth valve 037 and the seventh valve 044 as an example: the overpressurized gas in the first gas phase pipeline 024 and the second gas phase pipeline 026 mixes with the cryogenic liquid in the first liquid outlet pipeline 035 and the second liquid outlet pipeline 045, respectively. After vaporization in the upper vaporizer of the heat exchanger 3, the mixture enters the main unit 050 for use; this is the economical gas consumption function.

[0100] The above methods make the hydrogen supply system more economical and practical, reducing resource waste.

[0101] It should be noted that in both cold start and normal gas usage modes, valves 037 and 044 are closed.

[0102] In some embodiments, such as Figure 1 As shown, the second liquid outlet pipeline 045 is provided with a second valve assembly 046 for controlling the opening and closing of the second liquid outlet pipeline 045 and the flow status. 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] During use, the cryogenic liquid in the second gas cylinder 5 can enter the fuel inlet 33 of the heat exchanger 3 through 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 check valve, and a second overflow valve. The second valve, the second check valve, and the second overflow valve are sequentially spaced on the second liquid outlet pipeline 045 in a direction that gradually approaches the fuel inlet 33.

[0105] When the second valve is open, the cryogenic liquid in the second outlet line 045 is allowed to pass through; when the second valve is closed, the cryogenic liquid in the second outlet line 045 is not allowed to pass through. The second check valve can prevent the cryogenic liquid from flowing back to the second gas cylinder 5. The second overflow valve can allow the overpressurized cryogenic liquid to leak out from the bypass.

[0106] In some embodiments, such as Figure 1 As shown, the hydrogen supply system also includes a main hydrogen supply pipeline 047. One end of the main hydrogen supply pipeline 047 is connected to the first gas outlet pipeline 7 and the second gas outlet pipeline 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 connect with the main unit 050.

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

[0108] The gas supply valve 049 may include a pressure sensor, a solenoid valve, a pressure regulating valve, and a temperature sensor. The pressure sensor, solenoid valve, pressure regulating valve, and temperature sensor are distributed at intervals along the hydrogen supply main pipeline 047 in a direction that gradually moves away from the buffer tank 048.

[0109] Among them, the pressure sensor can measure the gas pressure in the hydrogen supply main pipeline 047, the solenoid valve can control the opening and closing of the hydrogen supply main pipeline 047, the pressure regulating valve can adjust the pressure of the gas output from the hydrogen supply main pipeline 047, and the temperature sensor can measure the gas temperature in the hydrogen supply main pipeline 047.

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

[0111] It should be noted that the third valve 8, the fourth valve 017, and the fifth valve 018 are usually not closed at the same time. To avoid safety hazards under fault or misoperation conditions, the above-mentioned hydrogen supply system is equipped with a third safety valve 034, which can release overpressure gas.

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

[0113] 1. The hydrogen supply system in the above embodiment can be arranged on both sides of the vehicle frame or on the top of the frame, using a dual-cylinder arrangement to meet the requirements of long-distance transportation and heavy loads.

[0114] 2. The first gas cylinder 4 and the second gas cylinder 5 share the filling, return, vaporization, pressurization and supply 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 centralized control of electrical components also improves the degree of integration.

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

[0116] 4. The hydrogen supply system in the above embodiments uses engine cycle heat or electric heating cycle heat for vaporization or pressurization, and is suitable for various operating conditions;

[0117] 5. The hydrogen supply system described in the above embodiments is highly versatile and can be applied to dual-side / dual-layer / single-layer + single-side systems, as well as three-cylinder systems. Similarly, the pressurization method described in point 4 above is also applicable to single-cylinder systems.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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, The first gas cylinder (4) and the second gas cylinder (5) share the same filling port (1), return gas port (2) and heat exchanger (3); The heat exchanger (3) is connected to a heating assembly (6) for heating the coolant inside the heat exchanger (3). The first outlet (31) of the heat exchanger (3) is connected to a first outlet pipe (7). A third valve (8) is provided on the first outlet pipe (7). The third valve (8) is used to connect to the main unit (050). The second outlet (32) of the heat exchanger (3) is connected to a second outlet pipe (9). A third check valve (10) is provided on the second outlet pipe (9). A second circulation pump (011) is connected in parallel on both sides of the third check valve (10). The first gas cylinder (4) is connected to a first pressurized gas outlet line (012), a first pressurized gas return line (013) and a first liquid outlet line (035), and the second gas cylinder (5) is connected to a second pressurized gas outlet line (014), a second pressurized gas return line (015) and a second liquid outlet line (045). The first pressurized outlet pipe (012) is connected to the second pressurized return pipe (015), and the connection between the first pressurized outlet pipe (012) and the second pressurized return pipe (015) is connected to the air inlet (34) of the heat exchanger (3) through the first pipe (016). The first pressurized return gas pipeline (013) is connected to the second pressurized outlet gas pipeline (014) and a fourth valve (017) and a fifth valve (018) are provided between them. 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 gas pipeline (7) between the first outlet gas port (31) of the heat exchanger (3) and the third valve (8). Both the first liquid outlet pipe (035) and the second liquid outlet pipe (045) are connected to the fuel inlet (33) of the heat exchanger (3); The heating assembly (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 coolant outlet and coolant inlet of the heat exchanger (3). The heater (62) and the circulating pump (63) are connected in series, and the heater (62) and the circulating pump (63) are connected in parallel with the eighth valve (61).

2. 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 a first shut-off valve (021) is provided on the first filling pipeline (020). The second gas cylinder (5) is connected to a second filling pipeline (022), and a second shut-off valve (023) is provided on the second filling pipeline (022). 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 liquid filling port (1).

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

4. The hydrogen supply system according to claim 3, characterized in that, The first filling pipeline (020) is connected to the first centralized vent (028) through the first venting pipeline (029), and the first venting pipeline (029) is equipped with a first safety valve (030). A second venting pipeline (031) is connected between the first gas phase pipeline (024) and the first centralized vent (028), and the second venting pipeline (031) is equipped with a second safety valve (032). A third discharge pipeline (033) is connected between the second pipeline (019) and the first centralized vent (028), and the third discharge pipeline (033) is equipped with a third safety valve (034).

5. The hydrogen supply system according to claim 4, characterized in that, The first liquid outlet pipeline (035) is provided with a first valve assembly (036) for controlling the opening and closing of the first liquid outlet pipeline (035) and the flow status. The end of the first liquid outlet pipe (035) away from the first gas cylinder (4) is connected to the connection point of the first gas phase pipe (024) and the second discharge pipe (031), and a sixth valve (037) is provided between the connection point of the first gas phase pipe (024) and the second discharge pipe (031) and the end of the first liquid outlet pipe (035) away from the first gas cylinder (4).

6. The hydrogen supply system according to claim 3, characterized in that, The second gas phase pipeline (026) is connected to the second centralized vent (038) through the fourth vent pipeline (039), and the fourth vent pipeline (039) is equipped with a fourth safety valve (040). A fifth discharge pipeline (041) is connected between the second filling pipeline (022) and the second centralized vent (038), and the fifth discharge pipeline (041) is equipped with a fifth safety valve (042).

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

8. 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 opening and closing of the second liquid outlet pipeline (045) and the flow status.

9. The hydrogen supply system according to any one of claims 1-8, characterized in that, It also includes a hydrogen supply main pipeline (047), one end of which is connected to the first gas outlet pipeline (7) and the second gas outlet pipeline (9), and the other end is provided with a buffer tank (048) and a gas supply group valve (049) and is used to connect to the host (050).

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