Liquid ammonia fuel storage and supply integrated device for mobile equipment

Abstract

The invention provides a liquid ammonia fuel storage and supply integrated device for mobile equipment, which comprises a liquid ammonia storage cabin, a fuel supply module and a double cut-off release DBB valve group, the liquid ammonia storage cabin is used for providing and storing liquid ammonia; the fuel supply module is used for carrying out stepped pressurization and temperature increase on the liquid ammonia fuel obtained from the liquid ammonia storage cabin, providing released cold energy to the liquid ammonia refrigeration air conditioning system and conveying the liquid ammonia fuel subjected to pressurization and temperature increase to the double-stop release DBB valve group; and the double-stop release DBB valve group conveys ammonia fuel to an ammonia engine for combustion, and meanwhile, the surplus ammonia fuel is recollected to a liquid ammonia storage cabin through the ammonia capture and absorption system and the ammonia gas liquefaction and collection system for recycling. According to the liquid ammonia fuel storage and supply integrated device for the mobile equipment, the fuel supply module is connected with the liquid ammonia refrigeration air conditioning system, and cold energy released in the fuel supply process can be provided for the air conditioning refrigeration system of the mobile equipment.

Description

Technical Field

[0001] The invention belongs to the field of ammonia fuel engines, and in particular relates to a liquid ammonia fuel storage and supply integrated device for mobile equipment. Background Art

[0002] At present, clean, environmentally friendly, green and low-carbon have become the hot spots for development in various countries. The application of ammonia fuel started early, and all countries are actively developing ammonia fuel applications covering vehicles, ships and other mobile equipment. Under the general background of green and emission-reduction development in the transportation industry, in order to comply with international, national and local regulations and reduce sulfur oxides (SOx), nitrogen oxides (NOx), particulate matter (PM), carbon and greenhouse gas (GHG) emissions from vehicles and ships, it is necessary not only to improve the energy efficiency of vehicles and ships from the technical and operational aspects, but also to apply clean energy to achieve the medium- and long-term carbon reduction goals. Ammonia is a zero-carbon fuel. It is a colorless and flammable liquid at room temperature with a pungent and foul odor and a gas density of 0.77g / L. Ammonia fuel has the advantages of high energy density, clean combustion, high calorific value, easy storage and transportation, a sound industrial foundation, and low production cost. It is easier to use on mobile equipment. According to the fuel characteristics of ammonia, ammonia fuel is usually stored and transported in the form of liquid ammonia. In terms of mobile equipment power applications, ammonia can be used directly as engine fuel or as fuel for fuel cells. Ammonia fuel internal combustion engines provide kinetic energy by directly burning liquid ammonia in the internal combustion engine. Under the action of a catalyst, ammonia fuel can achieve a power density similar to that of hydrogen fuel at the same temperature, and is considered to be an ideal fuel that can replace hydrogen for fuel cells.

[0003] At present, the application of ammonia fuel in the mobile equipment industry still faces the following challenges:

[0004] (1) The overall design and operating cost of ammonia fuel tanks. Compared with traditional fuel oil, the storage of ammonia fuel requires a larger space, which affects the storage and transportation of personnel and goods. Therefore, from the perspective of the entire life cycle, it is necessary to comprehensively consider multiple factors such as fuel consumption, transportation economy, and nitrogen oxide emissions.

[0005] (2) Safety protection and storage of ammonia fuel. Since ammonia fuel is toxic and alkaline, it is more prone to stress corrosion and is corrosive to certain materials. Detailed calculations are required to determine the selection of storage and transportation materials and to set up corresponding protection measures.

[0006] (3) Ammonia fuel is stored in the form of liquid ammonia. At present, there is still a large gap in the domestic standards for the entire industry chain involving liquid ammonia fuel storage, filling, transportation, application, maintenance, etc.

[0007] (4) The temperature of the "liquid ammonia" currently stored on mobile equipment is -33°C. It needs to be heated to 40°C before being sent to the power unit for combustion. In this process, cold energy will be released. Usually, this part of cold energy cannot be used, resulting in a waste of cold energy. The reuse of the cold energy released by liquid ammonia fuel also needs to be solved. Summary of the invention

[0008] In view of this, the present invention aims to propose a liquid ammonia fuel storage and supply integrated device for mobile equipment to solve the problem of cold energy waste caused by the liquid ammonia heating process.

[0009] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0010] A liquid ammonia fuel storage and supply integrated device for mobile equipment, comprising a liquid ammonia storage tank, a fuel supply module, a double cut-off release DBB valve group,

[0011] Liquid ammonia storage tank, used to provide and store liquid ammonia;

[0012] The fuel supply module is used to step-by-step pressurize and heat the liquid ammonia fuel obtained from the liquid ammonia storage tank, and at the same time provide the released cold energy to the liquid ammonia refrigeration and air-conditioning system, and transport the pressurized and heated liquid ammonia fuel to the double-blocking release DBB valve group;

[0013] The double-stop release DBB valve group delivers the ammonia fuel to the ammonia engine for combustion, and at the same time collects the surplus ammonia fuel into the liquid ammonia storage tank for recycling through the ammonia capture absorption system and the ammonia liquefaction collection system.

[0014] Furthermore, the liquid ammonia storage tank includes a low-pressure pump, which is used to transport the liquid ammonia fuel to the fuel supply module.

[0015] Furthermore, the liquid ammonia storage tank is in a semi-cold and semi-pressurized form, and the storage tank volume is calculated by the following formula:

[0016] Q = 12.7 × 10 6 ×(1+10%)V,

[0017] Where Q is the total calorific value of the fuel required for the maximum cruising range of the mobile equipment, 12.7X10 6 is the volume calorific value of ammonia, V is the capacity of the storage tank. Taking into account the thermal expansion of buffer fuel, accommodating oil residue, reserving buffer time from high-level alarm to cabin overflow, and storing evaporated gas in the upper space, the volume of the storage tank is artificially increased by 10% to ensure safety.

[0018] Furthermore, the fuel supply module comprises a high-pressure pump, a fuel heat exchanger and a filter which are connected in sequence by pipelines, and the filter outlet is connected to the inlet of the double-blocking release DBB valve group and the inlet of the ammonia capture absorption system.

[0019] Furthermore, the liquid ammonia fuel is delivered to the double-blocking release DBB valve group, and the liquid ammonia fuel, during the circulation supply process, involves reflux and re-entry into the pipeline, which requires hydraulic calculation, calculated by the following formula:

[0020] In hydrodynamics, the conservation of energy and mass is followed in multi-branch pipes;

[0021] Mass conservation: The sum of the fuel flow rates at each cross-sectional node is 0.

[0022]

[0023] Where Q n Indicates the fuel mass flow rate of each section at the intersection of the pipeline,

[0024] Energy conservation: For any two cross sections on a branch, the energy relationship between their nodes should comply with:

[0025]

[0026] The Bernoulli equation for the constant C is:

[0027]

[0028] Where P is the pressure at the node, MPa; ρ i1 , i2 is the fuel density at two points, kg / m3; v is the flow velocity, m / s; h is the potential height, m; g is the gravitational acceleration, m / s2; h i1-i2 is the energy loss between two points.

[0029] Furthermore, the liquid ammonia refrigeration and air-conditioning system includes a circulation pump and a heat exchanger. The inlet of the heat exchanger is connected to the outlet of the fuel heat exchanger. The outlet of the circulation pump is connected to the inlet of the fuel heat exchanger. The liquid ammonia fuel releases cold energy during the step-by-step pressurization and temperature increase process in the fuel supply module, and the cold energy is transferred to the liquid ammonia refrigeration and air-conditioning system or other refrigeration systems. The refrigeration process involves heat load calculation, which needs to be calculated for the low-temperature fuel supply module and the liquid ammonia refrigeration and air-conditioning system respectively. The formula is as follows:

[0030] Heat load of the fuel supply module:

[0031] Q = Q1 + Q2 + Q3;

[0032] Q1 is the heat transfer load, Q2 is the heat load of the equipment in the fuel supply module, and Q3 is the ventilation heat load. The design temperature of the supply module is -20℃, and the external environment temperature is 35℃;

[0033] Total heat load of liquid ammonia refrigeration and air conditioning system:

[0034] QAC =Q a +Q b ;

[0035] Where Q a is the cab heat transfer load, Q b is the fresh air heat load;

[0036] After calculating the heat load, The efficiency reflects the utilization of liquid ammonia refrigeration by the system, and the formula is as follows:

[0037]

[0038] Where E x.in Effective benefits for the system , E x.out Contribution to the system .

[0039] Furthermore, the double-stop release DBB valve group includes a supply control valve unit and a collection control valve unit that are independent of each other. A nitrogen unit and an exhaust unit are also provided on the pipeline between the supply control valve unit and the ammonia engine. The liquid ammonia fuel is divided into two paths after coming out of the fuel supply module. The first path directly enters the ammonia capture and absorption system, and the second path enters the ammonia engine after passing through the supply control valve unit, the nitrogen storage unit and the exhaust unit. The unused ammonia fuel flows into the collection control valve unit through the ammonia engine and is collected by the ammonia capture and absorption system together with the ammonia leaked from other places in the system.

[0040] Furthermore, the control valve unit is composed of a plurality of supply control valves; and the collection control valve unit is composed of a plurality of collection control valves.

[0041] Furthermore, the ammonia capture and absorption system has a spray absorption device.

[0042] Furthermore, the ammonia liquefaction collection system includes an ammonia filter, a condenser, a liquid ammonia collection tank and a circulation pump which are connected in sequence by pipelines. The ammonia filter is connected to the outlet of the ammonia capture and absorption system, and the circulation pump is connected to the liquid ammonia storage tank. The ammonia captured and absorbed by the ammonia capture and absorption system flows through the ammonia filter and the condenser in sequence for reliquefaction, and is stored in the liquid ammonia collection tank, and is re-delivered to the liquid ammonia storage tank through the circulation pump for recycling.

[0043] Compared with the prior art, the liquid ammonia fuel storage and supply integrated device for mobile equipment described in the present invention has the following advantages:

[0044] (1) The liquid ammonia fuel storage and supply integrated device for mobile equipment described in the present invention connects the fuel supply module with the liquid ammonia refrigeration and air-conditioning system, and can provide the cold energy released during the fuel supply process to the air-conditioning and refrigeration system of the mobile equipment.

[0045] (2) The liquid ammonia fuel storage and supply integrated device for mobile equipment described in the present invention has an ammonia capture and absorption system that uniformly collects leaked and surplus ammonia, and then recycles the fuel through an ammonia liquefaction collection system. The overall pipeline structure is simple, without too many branch pipelines, thereby avoiding the risk of branch pipeline leakage and improving the safety and operating economy of the system.

[0046] (3) The liquid ammonia fuel storage and supply integrated device for mobile equipment described in the present invention can accurately control the flow direction and flow rate of liquid ammonia in the liquid ammonia storage tank through a low-pressure pump, so that the liquid ammonia is step-by-step pressurized and heated in the fuel supply module and then flows through the double-shutoff release DBB valve group to supply the ammonia engine. During the pressurization and heating process of the liquid ammonia, the released cold energy can be supplied to the air-conditioning refrigeration system of the mobile equipment for utilization. At the same time, the ammonia capture and absorption system can spray and absorb the ammonia fuel leaked from the storage tank and the supply module. The excess fuel of the engine flows into the ammonia capture and absorption system through the DBB valve group. The absorbed ammonia fuel is re-liquefied through the ammonia liquefaction collection system and circulated to the storage tank for reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0048] Figure 1 This is a schematic diagram of an integrated liquid ammonia fuel storage and supply device for mobile equipment according to an embodiment of the present invention.

[0049] Description of reference numerals:

[0050] 1-liquid ammonia storage tank; 11-low-pressure pump; 2-fuel supply module; 21-high-pressure pump; 22-fuel heat exchanger; 23-filter; 3-double-stop release DBB valve group; 31-supply control valve unit; 32-collection control valve unit; 33-nitrogen inerting unit; 34-exhaust unit; 4-ammonia engine; 5-ammonia capture and absorption system; 6-liquid ammonia refrigeration and air-conditioning system; 61-circulating pump; 62-heat exchanger; 7-ammonia liquefaction collection system; 71-liquid ammonia collection tank; 72-condenser; 73-ammonia filter; 74-circulating pump. DETAILED DESCRIPTION

[0051] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0053] 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 by specific circumstances.

[0054] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0055] A liquid ammonia fuel storage and supply integrated device for mobile equipment, such as Figure 1 As shown, it includes a liquid ammonia storage tank 1, a fuel supply module 2, a double cut-off release DBB valve group 3, an ammonia engine 4, an ammonia capture absorption system 5, a liquid ammonia refrigeration and air conditioning system 6, and an ammonia liquefaction collection system 7.

[0056] Liquid ammonia storage tank 1, used for providing and storing liquid ammonia;

[0057] The fuel supply module 2 is used to step-by-step pressurize and heat the liquid ammonia fuel obtained from the liquid ammonia storage tank 1, and at the same time provide the released cold energy to the liquid ammonia refrigeration and air-conditioning system 6, and transport the pressurized and heated liquid ammonia fuel to the double-blocking release DBB valve group 3;

[0058] The double cut-off release DBB valve group 3 delivers the ammonia fuel to the ammonia engine 4 for combustion, and at the same time, the surplus ammonia fuel is collected again into the liquid ammonia storage tank 1 through the ammonia capture absorption system 5 and the ammonia liquefaction collection system 7 for recycling.

[0059] The overall structure of this solution is simple, and there is no additional branch pipeline, which avoids leakage of ammonia fuel from the branch pipeline.

[0060] A low-pressure pump 11 is arranged on the liquid ammonia storage tank 1 , and the low-pressure pump 11 is used to transport the liquid ammonia fuel to the fuel supply module 2 .

[0061] Liquid ammonia storage tank 1 is in a semi-cold and semi-pressurized form. The volume of the storage tank is calculated by the following formula:

[0062] Q = 12.7 × 10 6 ×(1+10%)V,

[0063] Where Q is the total calorific value of the fuel required for the maximum cruising range of the mobile equipment, 12.7X10 6 is the volume calorific value of ammonia, V is the capacity of the storage tank. Taking into account the thermal expansion of buffer fuel, accommodating oil residue, reserving buffer time from high-level alarm to cabin overflow, and storing evaporated gas in the upper space, the volume of the storage tank is artificially increased by 10% to ensure safety.

[0064] The liquid ammonia fuel is transported to the fuel supply module 2 via a low-pressure pump 11 arranged in the liquid ammonia storage tank 1, and the storage tank 1 is connected to the ammonia capture and absorption system 5 and the ammonia liquefaction collection system 7, so that the surplus or leaked ammonia captured by the engine can be re-stored and utilized.

[0065] The fuel supply module 2 includes a high-pressure pump 21, a fuel heat exchanger 22 and a filter 23 which are connected in sequence by pipelines. The liquid ammonia fuel delivered by the low-pressure pump 11 is pressurized and heated in a step-by-step manner after passing through the high-pressure pump 21, the fuel heat exchanger 22 and the filter 23 in sequence. The outlet of the filter 23 is connected to the inlet of the double-shutoff release DBB valve group 3 and the inlet of the ammonia capture absorption system 5, so that the leaked liquid ammonia fuel flows into the ammonia capture absorption system 5 for collection.

[0066] Preferably, the liquid ammonia is then transported to the double-blocking release DBB valve group 3, and the liquid ammonia fuel, during the circulation supply process, involves reflux and re-entry into the pipeline, which requires hydraulic calculation, calculated by the following formula: In hydrodynamics, the conservation of energy and mass are followed in multi-branch pipelines.

[0067] Conservation of mass: The sum of the fuel flow rates at each cross-sectional node is 0.

[0068]

[0069] Where Q n Indicates the fuel mass flow rate of each section at the intersection of the pipeline.

[0070] Energy conservation: For any two cross sections on a branch, the energy relationship between their nodes should comply with:

[0071]

[0072] The Bernoulli equation for the constant C is:

[0073]

[0074] Where P is the pressure at the node, MPa; ρ i1 , i2 is the fuel density at two points, kg / m3; v is the flow velocity, m / s; h is the potential height, m; g is the gravitational acceleration, m / s2; h i1-i2 is the energy loss between two points. Substituting the known parameters, the equation can be used for calculation.

[0075] The liquid ammonia refrigeration and air conditioning system 6 includes a circulation pump 61 and a heat exchanger 62. The inlet of the heat exchanger 62 is connected to the outlet of the fuel heat exchanger 22, and the outlet of the circulation pump 61 is connected to the inlet of the fuel heat exchanger 22.

[0076] During the step-by-step pressurization and temperature increase process in the fuel supply module 2, the liquid ammonia fuel will release cold energy, which will be transferred to the liquid ammonia refrigeration and air conditioning system 6 or other refrigeration systems through the circulation pump 61 and the heat exchanger 62 for effective utilization. The refrigeration process involves heat load calculation, which needs to be calculated for the low-temperature fuel supply module 2 and the air conditioning system respectively. The formula is as follows:

[0077] Heat load of fuel supply module 2:

[0078] Q = Q1 + Q2 + Q3;

[0079] Q1 is the heat transfer load, Q2 is the heat load of the equipment in the fuel supply module, and Q3 is the ventilation heat load. The design temperature of the supply module is -20℃, and the external environment temperature is 35℃.

[0080] Total heat load of liquid ammonia refrigeration and air conditioning system 6:

[0081] Q AC =Q a +Q b ;

[0082] Where Q a is the cab heat transfer load, Q b It is the fresh air heat load.

[0083] After calculating the heat load, The efficiency reflects the utilization of liquid ammonia refrigeration by the system, and the formula is as follows:

[0084]

[0085] Where E x.in Effective benefits for the system , E x.out Contribution to the system .

[0086] The double-stop release DBB valve group 3 includes a supply control valve unit 31 and a collection control valve unit 32 that are independent of each other. A nitrogen storage unit 33 and an exhaust fan 34 are also provided on the pipeline between the supply control valve unit 31 and the ammonia engine 4. The liquid ammonia fuel is divided into two paths from the filter 23. The first path directly enters the ammonia capture and absorption system 5, and the second path enters the ammonia engine 4 after passing through the supply control valve unit 31, the nitrogen storage unit 33 and the exhaust fan 34. The unused ammonia fuel flows into the collection control valve unit 32 through the ammonia engine 4 and is collected by the ammonia capture and absorption system 5 together with the ammonia leaked from other parts of the system. Since ammonia is toxic, a nitrogen inerting unit 33 (nitrogen) and an exhaust unit 34 (exhaust fan) are required to ensure the safe operation of the system. At the same time, the surplus fuel flows through the ammonia engine 4 and flows through the collection control valve unit 32 for recycling. The supply control valve unit 31 and the collection control valve unit 32 can accurately control the flow rate of the ammonia fuel, and in case of emergency leakage, the pipeline can be closed in time for evacuation.

[0087] Preferably, the control valve unit 31 is composed of a plurality of supply control valves; and the collection control valve unit 32 is composed of a plurality of collection control valves.

[0088] The ammonia capture and absorption system 5 has a spray absorption device, which can capture the ammonia leaked from the system and the excess ammonia from the engine to ensure the safe operation of the system.

[0089] The ammonia liquefaction collection system 7 includes an ammonia filter 73, a condenser 72, a liquid ammonia collection tank 71 and a circulation pump 74 which are connected in sequence by pipelines. The ammonia filter 73 is connected to the outlet of the ammonia capture and absorption system 5, and the circulation pump 74 is connected to the liquid ammonia storage tank 1. The ammonia captured and absorbed by the ammonia capture and absorption system 5 flows through the ammonia filter 73 and the condenser 72 in sequence for reliquefaction, and is stored in the liquid ammonia collection tank 71, and is re-delivered to the liquid ammonia storage tank 1 through the circulation pump 74 for recycling, thereby improving the economy of the system.

[0090] The working principle of a liquid ammonia fuel storage and supply integrated device for mobile equipment is:

[0091] The liquid ammonia fuel stored in the liquid ammonia storage tank 1 is transported to the fuel supply module 2 through the low-pressure pump 11. The liquid ammonia is pressurized and heated in a step-by-step manner in the fuel supply module 2 through the high-pressure pump 21, the fuel heat exchanger 22 and the filter 23. During the pressurization and heating process of the liquid ammonia, the released cold energy can be supplied to the liquid ammonia refrigeration and air-conditioning system 6 of the mobile equipment for utilization, and then transported to the double-cutoff release DBB valve group 3. The supply control valve unit 31 inside it transports the ammonia fuel to the ammonia engine 4 for combustion through the nitrogen inerting unit and the exhaust unit. The collection control valve unit 32 collects the surplus ammonia fuel through the ammonia capture absorption system 5 and the ammonia liquefaction collection system 7 to the liquid ammonia storage tank 1 for recycling. The ammonia capture absorption system 5 absorbs and captures the ammonia fuel leaked from each system to prevent fuel leakage, and flows back to the liquid ammonia storage tank 1 after secondary liquefaction collection for reuse, thereby ensuring the normal and economical operation of the ammonia fuel storage and supply integrated device.

[0092] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid ammonia fuel storage and supply integrated device for mobile equipment, characterized in that: Including liquid ammonia storage tank, fuel supply module, double cut-off release DBB valve group, Liquid ammonia storage tank, used to provide and store liquid ammonia; The fuel supply module is used to step-by-step pressurize and heat the liquid ammonia fuel obtained from the liquid ammonia storage tank, and at the same time provide the released cold energy to the liquid ammonia refrigeration and air-conditioning system, and transport the pressurized and heated liquid ammonia fuel to the double-blocking release DBB valve group; The double-stop release DBB valve group delivers the ammonia fuel to the ammonia engine for combustion, and at the same time collects the surplus ammonia fuel into the liquid ammonia storage tank for recycling through the ammonia capture absorption system and the ammonia liquefaction collection system.

2. The liquid ammonia fuel storage and supply integrated device for mobile equipment according to claim 1, characterized in that: The liquid ammonia storage tank includes a low-pressure pump, which is used to transport the liquid ammonia fuel to the fuel supply module.

3. The liquid ammonia fuel storage and supply integrated device for mobile equipment according to claim 1, characterized in that: The liquid ammonia storage tank is semi-cold and semi-pressurized. The volume of the storage tank is calculated by the following formula: Q=12.7×10 6 ×(1+10%)V, Where Q is the total calorific value of the fuel required for the maximum cruising range of the mobile equipment, 12.7X10 6 is the volume calorific value of ammonia, V is the capacity of the storage tank. Taking into account the thermal expansion of buffer fuel, accommodating oil residue, reserving buffer time from high-level alarm to cabin overflow, and storing evaporated gas in the upper space, the volume of the storage tank is artificially increased by 10% to ensure safety.

4. The liquid ammonia fuel storage and supply integrated device for mobile equipment according to claim 1, characterized in that: The fuel supply module comprises a high-pressure pump, a fuel heat exchanger and a filter which are connected in sequence by pipelines, and the filter outlet is connected to the inlet of the double-blocking release DBB valve group and the inlet of the ammonia capture absorption system.

5. The liquid ammonia fuel storage and supply integrated device for mobile equipment according to claim 4, characterized in that: Liquid ammonia fuel is delivered to the double-blocking release DBB valve group, and during the circulation supply process of liquid ammonia fuel, it involves reflux and re-entry into the pipeline, which requires hydraulic calculation, calculated by the following formula: In hydrodynamics, multi-branch pipelines follow the conservation of energy and mass; Mass conservation: The sum of the fuel flow rates at each cross-sectional node is 0. Where Q n Indicates the fuel mass flow rate of each section at the intersection of the pipeline, Energy conservation: For any two cross sections on a branch, the energy relationship between their nodes should comply with: The Bernoulli equation for the constant C is: Where P is the pressure at the node, MPa; ρ i1 , i2 is the fuel density at two points, kg / m3; v is the flow velocity, m / s; h is the potential height, m; g is the gravitational acceleration, m / s2; h i1-i2 is the energy loss between two points.

6. The liquid ammonia fuel storage and supply integrated device for mobile equipment according to claim 4, characterized in that: The liquid ammonia refrigeration and air-conditioning system includes a circulation pump and a heat exchanger. The inlet of the heat exchanger is connected to the outlet of the fuel heat exchanger, and the outlet of the circulation pump is connected to the inlet of the fuel heat exchanger. The liquid ammonia fuel releases cold energy during the step-by-step pressurization and heating process in the fuel supply module, and transfers this part of cold energy to the liquid ammonia refrigeration and air-conditioning system or other refrigeration systems. The refrigeration process involves heat load calculation, which needs to be calculated for the low-temperature fuel supply module and the liquid ammonia refrigeration and air-conditioning system respectively. The formula is as follows: Heat load of the fuel supply module: Q = Q1 + Q2 + Q3; Q1 is the heat transfer load, Q2 is the heat load of the equipment in the fuel supply module, and Q3 is the ventilation heat load; the design temperature of the supply module is -20°C, and the external environment temperature is 35°C; Total heat load of liquid ammonia refrigeration and air conditioning system: Q AC =Q a +Q b ; Where Q a is the cab heat transfer load, Q b is the fresh air heat load; After calculating the heat load, The efficiency reflects the utilization of liquid ammonia refrigeration by the system, and the formula is as follows: Where E x.in Effective benefits for the system E x.out Contribution to the system 7. The liquid ammonia fuel storage and supply integrated device for mobile equipment according to claim 1, characterized in that: The double-stop release DBB valve group includes a supply control valve unit and a collection control valve unit that are independent of each other. A nitrogen unit and an exhaust unit are also provided on the pipeline between the supply control valve unit and the ammonia engine. The liquid ammonia fuel is divided into two paths after coming out of the fuel supply module. The first path directly enters the ammonia capture and absorption system, and the second path enters the ammonia engine after passing through the supply control valve unit, the nitrogen storage unit and the exhaust unit. The unused ammonia fuel flows into the collection control valve unit through the ammonia engine and is collected by the ammonia capture and absorption system together with the ammonia leaked from other places in the system.

8. The liquid ammonia fuel storage and supply integrated device for mobile equipment according to claim 7, characterized in that: The control valve unit is composed of a plurality of supply control valves; the collection control valve unit is composed of a plurality of collection control valves.

9. The liquid ammonia fuel storage and supply integrated device for mobile equipment according to claim 1, characterized in that: There is a spray absorption device in the ammonia capture absorption system.

10. The liquid ammonia fuel storage and supply integrated device for mobile equipment according to claim 1, characterized in that: The ammonia liquefaction collection system includes an ammonia filter, a condenser, a liquid ammonia collection tank and a circulation pump which are connected in sequence by pipelines. The ammonia filter is connected to the outlet of the ammonia capture and absorption system, and the circulation pump is connected to the liquid ammonia storage tank. The ammonia captured and absorbed by the ammonia capture and absorption system flows through the ammonia filter and the condenser in sequence for reliquefaction, and is stored in the liquid ammonia collection tank, and is transported back to the liquid ammonia storage tank for recycling through the circulation pump.

Images