Ammonia fuel supply system, engine system and engine system starting method

Abstract

The invention discloses an ammonia fuel supply system, an engine system and an engine system starting method. The ammonia fuel supply system comprises a liquid ammonia tank, a main pipeline, a first branch, a second branch, a first gasification device and a second gasification device. The liquid ammonia tank is provided with a first pressure sensor and used for storing liquid ammonia. And the main pipeline is connected with the liquid ammonia tank in an on-off manner. The inlet end of the first branch is connected with the main pipeline, the outlet end of the first branch is connected with the liquid ammonia tank, and the first branch can be arranged in an on-off mode. The inlet end of the second branch is connected with the main pipeline, and the outlet end of the second branch is used for being connected with an engine and an ammonia decomposition device. The first gasification device is connected with the first branch and is used for pressurizing and gasifying the liquid ammonia into the ammonia gas. And the second gasification device is connected with the second branch and is used for gasifying the liquid ammonia into ammonia gas. The ammonia fuel supply system can pressurize the liquid ammonia tank when the pressure in the liquid ammonia tank is low.

Description

Technical Field

[0001] This application relates to the field of ammonia-hydrogen engines, and particularly to an ammonia fuel supply system, an engine system, and an engine system starting method. Background Art

[0002] An ammonia-hydrogen engine is a new type of internal combustion engine that uses ammonia and hydrogen as fuels and can reduce carbon emissions.

[0003] In the prior art, when the ambient temperature is too low, the pressure in the liquid ammonia tank is low, resulting in the inability to meet the engine startup requirements and thus affecting the cold startup of the engine. Summary of the Invention

[0004] The purpose of this application is to at least solve the problem that the pressure in the liquid ammonia tank is low when the ambient temperature is too low.

[0005] To this end, in the first aspect, this application proposes an ammonia fuel supply system that can boost the pressure of the liquid ammonia tank when the pressure in the liquid ammonia tank is low.

[0006] In the second aspect, this application also proposes an engine system including the ammonia fuel supply system of the first aspect.

[0007] In the third aspect, this application also proposes an engine system starting method applied to the engine system of the second aspect.

[0008] The ammonia fuel supply system of the first aspect of this application includes a liquid ammonia tank, a main pipeline, a first branch, a second branch, a first gasification device, and a second gasification device. The liquid ammonia tank is used to store liquid ammonia and is provided with a first pressure sensor; the main pipeline is connected to the liquid ammonia tank in a way that can be switched on and off; the inlet end of the first branch is connected to the main pipeline, the outlet end of the first branch is connected to the liquid ammonia tank, and the first branch can be switched on and off; the inlet end of the second branch is connected to the main pipeline, and the outlet end of the second branch is used to be connected to an engine and an ammonia decomposition device; the first gasification device is connected to the first branch and is between the inlet end and the outlet end of the first branch, and the first gasification device is used to pressurize and gasify the liquid ammonia into ammonia gas and input the ammonia gas into the liquid ammonia tank through the outlet end of the first branch; the second gasification device is connected to the second branch and is between the inlet end and the outlet end of the second branch, and is used to gasify the liquid ammonia into ammonia gas.

[0009] For the ammonia fuel supply system of the present application, when the engine is cold started, the pressure in the liquid ammonia tank is obtained through the first pressure sensor. When the pressure in the liquid ammonia tank is too low, the main pipeline is controlled to be connected, and the first branch is controlled to be connected. The liquid ammonia discharged from the liquid ammonia tank is pressurized and gasified into ammonia gas through the first gasification device, and the ammonia gas is transported into the liquid ammonia tank through the first branch, so that the pressure in the liquid ammonia tank increases rapidly, making the pressure in the liquid ammonia tank reach a reasonable range, thus avoiding affecting the cold start of the engine. The liquid ammonia discharged from the liquid ammonia tank can be gasified through the second gasification device to form ammonia gas, and the ammonia gas can be transported to the engine and the ammonia decomposition device through the second branch.

[0010] In some embodiments of the present application, the first gasification device includes a liquid ammonia pump and a heating component. Both the liquid ammonia pump and the heating component are connected to the first branch. The liquid ammonia pump is used to pressurize the liquid ammonia, and the heating component is used to gasify the liquid ammonia into the ammonia gas.

[0011] In some embodiments of the present application, the heating component includes a first heater and a first heat exchanger. The first heat exchanger is used to be connected to the cooling water pipeline of the engine and is connected to the first branch to heat and gasify the liquid ammonia through the cooling water of the engine. The first heater is arranged in the first heat exchanger and is used to heat and gasify the liquid ammonia.

[0012] In some embodiments of the present application, the first branch is provided with a first on-off valve and a second on-off valve. The first gasification device is connected to the inlet end of the first branch in a way that can be switched on and off through the first on-off valve, and the first gasification device is connected to the outlet end of the first branch in a way that can be switched on and off through the second on-off valve.

[0013] In some embodiments of the present application, the second gasification device includes a second heater and a second heat exchanger. The second heat exchanger is used to be connected to the cooling water pipeline of the engine and is connected to the second branch to heat and gasify the liquid ammonia through the cooling water of the engine. The second heater is arranged in the second branch and is used to heat and gasify the liquid ammonia.

[0014] The engine system of the second aspect of the present application includes the ammonia fuel supply system, the engine and the ammonia decomposition device as described in the first aspect above. The engine is connected to the outlet end of the second branch; the ammonia decomposition device is connected to the outlet end of the second branch and can decompose ammonia gas to generate hydrogen and nitrogen gas. The ammonia decomposition device is also connected to the engine to be able to introduce the hydrogen and nitrogen gas into the engine.

[0015] In some embodiments of the present application, the engine system further includes a gas mixer. The gas mixer is connected to the outlet end of the second branch through a first intake pipe. The first intake pipe is provided with a third on-off valve and a first injection valve. The third on-off valve is used to control the on-off of the first intake pipe, and the first injection valve is used to introduce ammonia gas into the gas mixer after the third on-off valve is opened.

[0016] The gas mixer is connected to the ammonia decomposition device through a second intake pipe. The second intake pipe is provided with a fourth on-off valve and a second injection valve. The fourth on-off valve is used to control the on-off of the second intake pipe, and the second injection valve is used to introduce hydrogen-nitrogen gas into the gas mixer after the fourth on-off valve is opened. The gas mixer is used to mix the hydrogen-nitrogen gas and the ammonia gas into a mixed gas. The gas mixer is connected to the engine through an outlet pipe and can introduce the mixed gas into the engine.

[0017] The engine system starting method of the third aspect of the present application is applied to the engine system described in the second aspect above. The engine system starting method includes:

[0018] In response to a cold start of the engine, obtain the pressure of the liquid ammonia tank and compare the pressure of the liquid ammonia tank with a predetermined value;

[0019] According to the pressure of the liquid ammonia tank being less than the predetermined value, control the main pipeline to be connected, control the first branch to be connected, and control the first vaporization device to pressurize and vaporize the liquid ammonia into ammonia gas, so that the ammonia gas enters the liquid ammonia tank through the first pipeline and increases the pressure of the liquid ammonia tank;

[0020] Control the second vaporization device to vaporize the liquid ammonia into ammonia gas.

[0021] In some embodiments of the present application, the engine system starting method further includes:

[0022] According to the pressure of the liquid ammonia tank being greater than or equal to the predetermined value, control the main pipeline to be connected and control the disconnection of the connection of the first branch;

[0023] Control the second vaporization device to vaporize the liquid ammonia into ammonia gas.

[0024] In some embodiments of the present application, the engine system further includes a radiator. The radiator is connected to the engine in a way that can be turned on and off. The radiator is used to dissipate heat from the cooling water of the engine.

[0025] The engine system starting method further includes:

[0026] In response to a hot start of the engine, obtain the temperature of the cooling water of the engine;

[0027] Compare the temperature of the cooling water with a preset value;

[0028] According to the temperature of the cooling water being greater than the preset value, control the radiator to be connected to the engine;

[0029] Control the main pipeline to be connected, control the connection of the first branch to be disconnected, and control the second vaporization device to vaporize the liquid ammonia into ammonia;

[0030] According to the temperature of the cooling water being less than or equal to the preset value, control the disconnection of the radiator from the engine;

[0031] Control the main pipeline to be connected, control the connection of the first branch to be disconnected, and control the second vaporization device to vaporize the liquid ammonia into ammonia. Description of the Drawings

[0032] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. Among them:

[0033] Figure 1 is a schematic diagram of an engine system according to some embodiments of the present application.

[0034] Figure 2 is a method for starting an engine system according to some embodiments of the present application.

[0035] The reference numerals in the drawings are as follows:

[0036] 100, engine system;

[0037] 110, ammonia fuel supply system; 120, engine; 121, cooling water sensor; 122, cooling water outlet pipe; 123, cooling water return pipe; 130, ammonia decomposition device; 131, third heater; 132, ammonia decomposition device sensor; 140, gas mixer; 141, first intake pipe; 142, third on-off valve; 143, first injection valve; 144, second intake pipe; 145, fourth on-off valve; 146, second injection valve; 147, third intake pipe; 150, radiator; 151, fourth on-off valve;

[0038] 1, liquid ammonia tank; 11, first pressure sensor; 12, temperature sensor; 13, liquid level gauge;

[0039] 2, main pipeline; 21, third on-off valve;

[0040] 3. First branch; 31. First on-off valve; 32. Second on-off valve;

[0041] 4. Second branch; 41. Second pressure sensor; 42. Safety valve; 43. First pressure stabilizing valve; 44. Second pressure stabilizing valve;

[0042] 5. First gasification device; 51. Liquid ammonia pump; 52. Heating assembly; 521. First heater; 522. First heat exchanger;

[0043] 6. Second gasification device; 61. Second heater; 62. Second heat exchanger. Detailed implementation manners

[0044] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0045] It should be understood that the terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to be limiting. Unless otherwise clearly specified in the context, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0046] Although terms such as first, second, and third may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first" and "second" and other numerical terms do not imply an order or sequence when used herein. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0047] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is rotated, an element described as "below" or "beneath" another element or feature will then be oriented as "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both the upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are to be interpreted accordingly.

[0048] In the description of the application, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", "height direction", "first direction", "second direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed, operated, or used in a specific orientation, and thus should not be construed as a limitation on the embodiments of the present application.

[0049] In this application, unless otherwise clearly specified or limited, terms such as "install", "connect", "couple", "fix", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] An ammonia-hydrogen engine is a new type of internal combustion engine. The ammonia-hydrogen engine uses ammonia and hydrogen as fuels and can reduce carbon emissions.

[0051] In the prior art, in the case of too low ambient temperature, the pressure in the liquid ammonia tank is low, resulting in the inability to meet the engine startup requirements, thus affecting the cold startup of the engine.

[0052] In order to at least solve the problem that the pressure in the liquid ammonia tank is low when the ambient temperature is too low.

[0053] For this reason, an embodiment of this application proposes an ammonia fuel supply system 110 that can boost the pressure of the liquid ammonia tank 1 when the pressure in the liquid ammonia tank 1 is low.

[0054] This application also proposes an engine system 100 including the ammonia fuel supply system 110 as described in the above embodiment.

[0055] This application also proposes an engine system startup method applied to the engine system 100 as described in the above embodiment.

[0056] The following describes the ammonia fuel supply system 110, the engine system 100, and the engine system startup method of the embodiments of this application with reference to the drawings.

[0057] As Figure 1As shown in the figure, the ammonia fuel supply system 110 according to the embodiment of the present application includes an ammonia liquid tank 1, a main pipeline 2, a first branch 3, a second branch 4, a first gasification device 5, and a second gasification device 6. The ammonia liquid tank 1 is used for storing ammonia liquid and is provided with a first pressure sensor 11; the main pipeline 2 is connected to the ammonia liquid tank 1 in a way that can be switched on and off; the inlet end of the first branch 3 is connected to the main pipeline 2, and the outlet end of the first branch 3 is connected to the ammonia liquid tank 1, and the first branch 3 can be switched on and off; the inlet end of the second branch 4 is connected to the main pipeline 2, and the outlet end of the second branch 4 is used to be connected to an engine 120 and an ammonia decomposition device 130; the first gasification device 5 is connected to the first branch 3 and is between the inlet end and the outlet end of the first branch 3, and the first gasification device 5 is used for pressurizing and gasifying ammonia liquid into ammonia gas, and inputting the ammonia gas into the ammonia liquid tank through the outlet end of the first branch 3; the second gasification device 6 is connected to the second branch 4 and is between the inlet end and the outlet end of the second branch 4, and is used for gasifying ammonia liquid into ammonia gas.

[0058] The outlet end of the first branch 3 is the end of the first branch 3 with an outlet, and the inlet end of the first branch 3 is the end of the first branch 3 with an inlet. The outlet end of the second branch 4 is the end of the second branch 4 with an outlet, and the inlet end of the second branch 4 is the end of the second branch 4 with an inlet.

[0059] When the engine is cold-started, the pressure in the ammonia liquid tank 1 is obtained through the first pressure sensor 11. When the pressure in the ammonia liquid tank 1 is too low, the main pipeline 2 is controlled to be connected, and the first branch 3 is controlled to be connected. The ammonia liquid discharged from the ammonia liquid tank 1 is pressurized and gasified into ammonia gas through the first gasification device 5, and the ammonia gas is transported into the ammonia liquid tank 1 through the first branch 3, so that the pressure in the ammonia liquid tank 1 increases rapidly, making the pressure in the ammonia liquid tank 1 reach a reasonable range, thereby avoiding affecting the cold start of the engine. The ammonia liquid discharged from the ammonia liquid tank 1 can be gasified through the second gasification device 6 to form ammonia gas, and the ammonia gas can be transported to the engine 120 and the ammonia decomposition device 130 through the second branch 4.

[0060] When the pressure in the ammonia liquid tank 1 is normal, the main pipeline 2 is controlled to be connected, and the first branch 3 is controlled to be disconnected. The ammonia liquid discharged from the ammonia liquid tank 1 can be gasified through the second gasification device 6 to form ammonia gas, and the ammonia gas can be transported to the engine 120 and the ammonia decomposition device 130 through the second branch 4.

[0061] As Figure 1 As shown in the figure, in some embodiments, the first gasification device 5 includes an ammonia liquid pump 51 and a heating component 52. Both the ammonia liquid pump 51 and the heating component 52 are connected to the first branch 3. The ammonia liquid pump 51 is used for pressurizing ammonia liquid, and the heating component 52 is used for gasifying ammonia liquid into ammonia gas.

[0062] The liquid ammonia pump 51 can boost the pressure of the liquid ammonia, so that after the liquid ammonia enters the heating component 52, ammonia gas with a relatively high pressure is formed, making it easier for the ammonia gas to enter the liquid ammonia tank 1 from the first branch 3 and enabling the pressure in the liquid ammonia tank 1 to increase rapidly when the ammonia gas enters the liquid ammonia tank 1.

[0063] The heating component 52 can heat the liquid ammonia to vaporize it and form ammonia gas.

[0064] As Figure 1 shown, in some embodiments, the heating component 52 includes a first heater 521 and a first heat exchanger 522. The first heat exchanger 522 is used to be connected to the cooling water pipeline of the engine 120 and is connected to the first branch 3 to heat and vaporize the liquid ammonia through the cooling water of the engine 120. The first heater 521 is arranged inside the first heat exchanger 522 and is used to heat and vaporize the liquid ammonia.

[0065] The first heater 521 can heat the liquid ammonia to vaporize it into ammonia gas. The first heat exchanger 522 can heat the liquid ammonia through the cooling water of the engine 120, thereby cooling the cooling water of the engine 120 and recovering the heat of the cooling water of the engine 120 to increase the energy utilization rate. Through the first heat exchanger 522, the heat generation amount of the first heater 521 can also be reduced, making the heating component 52 of this embodiment more energy-saving.

[0066] As Figure 1 shown, in some embodiments, the first branch 3 is provided with a first on-off valve 31 and a second on-off valve 32. The first gasification device 5 is connected to the inlet end of the first branch 3 in a switchable manner through the first on-off valve 31, and the first gasification device 5 is connected to the outlet end of the first branch 3 in a switchable manner through the second on-off valve 32.

[0067] When the first on-off valve 31 and the second on-off valve 32 are closed, the first on-off valve 31 can prevent the liquid ammonia from entering the first gasification device 5 from the inlet end of the first branch 3. The second on-off valve 32 can prevent the liquid ammonia from entering the first gasification device 5 from the outlet end of the first branch 3. Thus, the on-off performance of the first branch 3 can be improved through the first on-off valve 31 and the second on-off valve 32. When the first branch 3 is disconnected, the liquid ammonia can be prevented from entering the first gasification device 5.

[0068] As Figure 1 shown, in some embodiments, the second gasification device 6 includes a second heater 61 and a second heat exchanger 62. The second heat exchanger 62 is used to be connected to the cooling water pipeline of the engine 120 and is connected to the second branch 4 to heat and vaporize the liquid ammonia through the cooling water of the engine 120. The second heater 61 is arranged in the second branch 4 and is used to heat and vaporize the liquid ammonia.

[0069] The liquid ammonia can be preliminarily heated by the second heat exchanger 62 to vaporize part of the liquid ammonia into ammonia gas. The liquid ammonia can be further heated by the second heater 61 to vaporize the liquid ammonia into ammonia gas.

[0070] In addition, the second heat exchanger 62 can heat the liquid ammonia through the cooling water of the engine 120, thereby cooling the cooling water of the engine 120 and recovering the heat of the cooling water of the engine 120 to increase the energy utilization rate. Through the second heat exchanger 62, the heat generation amount of the second heater 61 can also be reduced, so that the second vaporization device 6 of this embodiment is more energy-saving.

[0071] As Figure 1 shown, specifically, the cooling water pipeline includes a cooling water inlet pipe 122 and a cooling water return pipe 123. The water inlet of the first heat exchanger 522 and the water inlet of the second heat exchanger 62 are both connected to the cooling water inlet pipe 122, and the water outlet of the first heat exchanger 522 and the water outlet of the second heat exchanger 62 are both connected to the cooling water return pipe 123.

[0072] A cooling water circulation loop is formed between the engine 120 and the first heat exchanger 522, and between the engine 120 and the second heat exchanger 62 through the cooling water inlet pipe 122 and the cooling water return pipe 123, so as to facilitate heat exchange of the cooling water of the engine 120.

[0073] The engine system 100 of the embodiment of the present application includes the ammonia fuel supply system 110, the engine 120, and the ammonia decomposition device 130 as described in the above embodiment. The engine 120 is connected to the outlet end of the second branch 4; the ammonia decomposition device 130 is connected to the outlet end of the second branch 4 and can decompose ammonia gas to generate hydrogen-nitrogen gas. The ammonia decomposition device 130 is also connected to the engine 120 to be able to introduce hydrogen-nitrogen gas into the engine 120.

[0074] For the engine system 100 of the embodiment of the present application, when the engine is cold-started, the pressure in the liquid ammonia tank 1 is obtained through the first pressure sensor 11. When the pressure in the liquid ammonia tank 1 is too low, the main pipeline 2 is controlled to be connected, and the first branch 3 is controlled to be connected. The liquid ammonia discharged from the liquid ammonia tank 1 is pressurized and vaporized into ammonia gas by the first vaporization device 5, and the ammonia gas is transported into the liquid ammonia tank 1 through the first branch 3, so that the pressure in the liquid ammonia tank 1 increases rapidly, and the pressure in the liquid ammonia tank 1 reaches a reasonable range, thereby avoiding affecting the cold start of the engine. The liquid ammonia discharged from the liquid ammonia tank 1 can be vaporized by the second vaporization device 6 to form ammonia gas, and the ammonia gas can be transported to the engine 120 and the ammonia decomposition device 130 through the second branch 4.

[0075] Hydrogen-nitrogen gas refers to a mixture of hydrogen and nitrogen gas. When preparing hydrogen gas from ammonia gas, ammonia gas decomposes into hydrogen gas and nitrogen gas, and the hydrogen gas and nitrogen gas are mixed to form hydrogen-nitrogen gas. Hydrogen gas is a colorless, odorless, and flammable gas with strong reducibility. Nitrogen gas is a colorless, odorless gas with relatively stable chemical properties.

[0076] When the pressure in the liquid ammonia tank 1 is normal, control the main pipeline 2 to be connected and control the first branch 3 to be disconnected. The second vaporization device 6 can vaporize the liquid ammonia discharged from the liquid ammonia tank 1 to form ammonia gas, and the second branch 4 can supply ammonia gas to the engine 120 and the ammonia decomposition device 130.

[0077] As Figure 1 shown, in some embodiments, the engine system 100 further includes a gas mixer 140. The gas mixer 140 is connected to the outlet end of the second branch 4 through a first intake pipe 141. The first intake pipe 141 is provided with a third on-off valve 142 and a first injection valve 143. The third on-off valve 142 is used to control the on-off of the first intake pipe 141, and the first injection valve 143 is used to introduce ammonia gas into the gas mixer 140 after the third on-off valve 142 is opened.

[0078] The gas mixer 140 is connected to the ammonia decomposition device 130 through a second intake pipe 144. The second intake pipe 144 is provided with a fourth on-off valve 145 and a second injection valve 146. The fourth on-off valve 145 is used to control the on-off of the second intake pipe 144, and the second injection valve 146 is used to introduce hydrogen-nitrogen gas into the gas mixer 140 after the fourth on-off valve 145 is opened. The gas mixer 140 is used to mix hydrogen-nitrogen gas and ammonia gas into a mixed gas. The gas mixer 140 is connected to the engine 120 through an outlet pipe and can introduce the mixed gas into the engine 120.

[0079] The gas mixer 140 can make the ammonia gas and hydrogen-nitrogen gas mix more evenly, thereby increasing the combustion effect of the engine 120. The third on-off valve 142 can control the on-off of the first intake pipe 141, and the first injection valve 143 can control the flow rate of the first intake pipe 141 to make the amount of ammonia gas entering the gas mixer 140 more accurate.

[0080] The fourth on-off valve 145 can control the on-off of the second intake pipe 144, and the second injection valve 146 can control the flow rate of the second intake pipe 144 to make the intake amount of hydrogen-nitrogen gas in the gas mixer 140 more accurate.

[0081] As Figure 1As shown, specifically, the ammonia decomposition device 130 is connected to the outlet end of the second branch 4 through the third intake pipe 147. The engine system 100 further includes a first pressure stabilizing valve 43 and a second pressure stabilizing valve 44. The first pressure stabilizing valve 43 is disposed at the outlet end of the second branch 4, and the second pressure stabilizing valve 44 is disposed in the third intake pipe 147. That is to say, the second branch 4 is provided with the first pressure stabilizing valve 43 and the second pressure stabilizing valve 44. The second branch 4 is connected to the gas mixer 140 through the first pressure stabilizing valve 43, and the second branch 4 is connected to the ammonia decomposition device 130 through the second pressure stabilizing valve 44.

[0082] Through the first pressure stabilizing valve 43 and the second pressure stabilizing valve 44, the pressure of ammonia gas can be regulated so that the flow rates of ammonia gas entering the gas mixer 140 and the ammonia decomposition device 130 are within a reasonable range.

[0083] As Figure 1 shown, in some embodiments, the engine system 100 further includes a radiator 150. The radiator 150 is connected to the engine 120 in a way that can be switched on and off. The radiator 150 is used to dissipate heat from the cooling water of the engine 120 so that the cooling water of the engine 120 can be cooled in time.

[0084] As Figure 1 shown, in some embodiments, the liquid ammonia tank 1 is provided with a temperature sensor 12. The temperature sensor 12 is used to detect the temperature of the liquid ammonia in the liquid ammonia tank 1 to facilitate monitoring the state of the liquid ammonia in the liquid ammonia tank 1.

[0085] As Figure 1 shown, in some embodiments, a liquid level gauge 13 is provided in the liquid ammonia tank 1. The liquid level gauge 13 is used to detect the liquid level in the liquid ammonia tank 1. Through the liquid level gauge 13, it can be determined whether there is remaining liquid ammonia in the liquid ammonia tank 1, and the remaining amount of liquid ammonia in the liquid ammonia tank 1 can be obtained.

[0086] As Figure 1 shown, in some embodiments, the second branch 4 is provided with a safety valve 42. The second vaporization device 6 is connected to the outlet end of the second branch 4 through the safety valve 42.

[0087] The safety valve 42 can provide overpressure protection for the second branch 4 to prevent the second branch 4 from bursting due to excessive pressure.

[0088] As Figure 1 shown, in some embodiments, the second branch 4 is provided with a second pressure sensor 41. The second pressure sensor 41 is located between the outlet of the second vaporization device 6 and the outlet end of the second branch 4 and is used to detect the air pressure of ammonia gas to monitor the air pressure in the second branch 4.

[0089] As Figure 1As shown, in some embodiments, the main pipeline 2 is provided with a third on-off valve 21, and the on-off of the main pipeline 2 can be controlled through the third on-off valve 21.

[0090] As Figure 1 shown, in some embodiments, the radiator 150 is connected to the engine 120 through a fourth on-off valve 151. The on-off between the radiator 150 and the engine 120 can be controlled through the fourth on-off valve 151.

[0091] As Figure 1 shown, in some embodiments, the engine 120 is provided with a cooling water sensor 121, and the temperature of the cooling water can be obtained through the cooling water sensor 121 to monitor the temperature of the cooling water.

[0092] As Figure 1 shown, in some embodiments, the ammonia decomposition device 130 is provided with a third heater 131 and an ammonia decomposition device sensor 132. The ammonia decomposition device 130 can be heated through the third heater 131 so that the ammonia decomposition device 130 can be adapted to a suitable working temperature. The temperature of the ammonia decomposition device 130 can be obtained through the ammonia decomposition device sensor 132 to adjust the ammonia decomposition device 130 according to the temperature of the ammonia decomposition device 130.

[0093] As Figure 2 shown, the engine system starting method of the embodiment of the present application is applied to the engine system in the above embodiments. The engine system starting method includes:

[0094] S100. In response to a cold start of the engine, obtain the pressure of the liquid ammonia tank and compare the pressure of the liquid ammonia tank with a predetermined value;

[0095] S200. According to the pressure of the liquid ammonia tank being less than the predetermined value, control the main pipeline to be connected, control the first branch to be connected, control the first gasification device to gasify liquid ammonia into ammonia gas, so that the ammonia gas enters the liquid ammonia tank through the first pipeline and increases the pressure of the liquid ammonia tank;

[0096] S300. Control the second gasification device to gasify liquid ammonia into ammonia gas.

[0097] The pressure state of the liquid ammonia tank can be judged through the relationship between the pressure in the liquid ammonia tank and the predetermined value. When the pressure in the liquid ammonia tank is lower than the predetermined value, the pressure of the liquid ammonia tank is too low. When the pressure in the liquid ammonia tank is greater than or equal to the predetermined value, the pressure of the liquid ammonia tank is in a reasonable range. As an example, the preset value is 0.8 MPa (MegaPascal).

[0098] According to the pressure of the liquid ammonia tank being less than a predetermined value, by connecting the main pipeline and the first branch pipeline, the liquid ammonia in the liquid ammonia tank can enter the first gasification device. The first gasification device pressurizes and gasifies the liquid ammonia into ammonia gas, and the pressurized and gasified ammonia gas enters the liquid ammonia tank, so that the pressure in the liquid ammonia tank increases rapidly, making the pressure in the liquid ammonia tank reach a reasonable range, thus avoiding affecting the cold start of the engine.

[0099] The second gasification device can gasify the liquid ammonia discharged from the liquid ammonia tank to form ammonia gas, and the second branch pipeline can deliver the ammonia gas to the engine and the ammonia decomposition device.

[0100] In some embodiments, the engine system starting method further includes:

[0101] According to the pressure of the liquid ammonia tank being greater than or equal to the predetermined value, control the connection of the main pipeline and control the disconnection of the connection of the first branch pipeline;

[0102] Control the second gasification device to gasify the liquid ammonia into ammonia gas.

[0103] When the pressure in the liquid ammonia tank is greater than or equal to the predetermined value and the pressure in the liquid ammonia tank is in a reasonable range, there is no need for the first gasification device to pressurize the liquid ammonia tank. Control the disconnection of the connection of the first branch pipeline, and the second gasification device can gasify the liquid ammonia discharged from the liquid ammonia tank to form ammonia gas, and the second branch pipeline can deliver the ammonia gas to the engine and the ammonia decomposition device.

[0104] In some embodiments, the engine system further includes a radiator. The radiator is connected to the engine in a connectable and disconnectable manner. The radiator is used to dissipate heat from the cooling water of the engine. The engine system starting method further includes:

[0105] In response to a hot start of the engine, obtain the temperature of the cooling water of the engine;

[0106] Compare the temperature of the cooling water with a preset value;

[0107] According to the temperature of the cooling water being greater than the preset value, control the connection of the radiator and the engine;

[0108] Control the connection of the main pipeline, control the disconnection of the connection of the first branch pipeline, and control the second gasification device to gasify the liquid ammonia into ammonia gas;

[0109] According to the temperature of the cooling water being less than or equal to the preset value, control the disconnection of the connection of the radiator and the engine;

[0110] Control the connection of the main pipeline, control the disconnection of the connection of the first branch pipeline, and control the second gasification device to gasify the liquid ammonia into ammonia gas.

[0111] The temperature state of the cooling water can be judged by the relationship between the temperature of the cooling water and the preset value. When the temperature of the cooling water is greater than the preset value, the temperature of the cooling water is too high, and the cooling water is cooled to increase the cooling effect of the cooling water. The control main pipeline is connected, the connection of the first branch is controlled to be disconnected, and the second vaporization device is controlled to vaporize liquid ammonia into ammonia, thereby starting the engine system.

[0112] When the temperature of the cooling water is less than or equal to the preset value, the temperature of the cooling water is within a suitable range. The control main pipeline is connected, the connection of the first branch is controlled to be disconnected, and the second vaporization device is controlled to vaporize liquid ammonia into ammonia, thereby starting the engine system.

[0113] As an example, the preset value is 80 °C (degrees Celsius).

[0114] As mentioned above, only the preferred specific embodiments of the present application are described, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the technical field of the present application within the technical scope disclosed by the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An ammonia fuel supply system, characterized in that, Comprising: A liquid ammonia tank for storing liquid ammonia and provided with a first pressure sensor; A main pipeline connected to the liquid ammonia tank in a switchable manner; A first branch, the inlet end of the first branch is connected to the main pipeline, the outlet end of the first branch is connected to the liquid ammonia tank, and the first branch is provided to be switchable; A second branch, the inlet end of the second branch is connected to the main pipeline, and the outlet end of the second branch is used to be connected to an engine and an ammonia decomposition device; A first gasification device connected to the first branch and between the inlet end and the outlet end of the first branch, the first gasification device is used to pressurize and gasify the liquid ammonia into ammonia gas, and input the ammonia gas into the liquid ammonia tank through the outlet end of the first branch; A second gasification device connected to the second branch and between the inlet end and the outlet end of the second branch, and used to gasify the liquid ammonia into ammonia gas.

2. The ammonia fuel supply system according to claim 1, characterized in that, The first gasification device includes a liquid ammonia pump and a heating component, both the liquid ammonia pump and the heating component are connected to the first branch, the liquid ammonia pump is used to pressurize the liquid ammonia, and the heating component is used to gasify the liquid ammonia into the ammonia gas.

3. The ammonia fuel supply system according to claim 2, wherein The heating component includes a first heater and a first heat exchanger, the first heat exchanger is used to be connected to the cooling water pipeline of the engine and connected to the first branch to heat and gasify the liquid ammonia through the cooling water of the engine, and the first heater is arranged in the first heat exchanger and used to heat and gasify the liquid ammonia.

4. The ammonia fuel supply system according to claim 1, characterized in that, The first branch is provided with a first on-off valve and a second on-off valve, the first gasification device is connected to the inlet end of the first branch in a switchable manner through the first on-off valve, and the first gasification device is connected to the outlet end of the first branch in a switchable manner through the second on-off valve.

5. The ammonia fuel supply system according to claim 1, wherein, The second gasification device includes a second heater and a second heat exchanger, the second heat exchanger is used to be connected to the cooling water pipeline of the engine and connected to the second branch to heat and gasify the liquid ammonia through the cooling water of the engine, and the second heater is arranged in the second branch and used to heat and gasify the liquid ammonia.

6. An engine system, characterized in that, Comprising: The ammonia fuel supply system according to any one of claims 1 to 5; An engine connected to the outlet end of the second branch; An ammonia decomposition device connected to the outlet end of the second branch and capable of decomposing ammonia gas to generate hydrogen and nitrogen gas, and the ammonia decomposition device is also connected to the engine to be able to introduce the hydrogen and nitrogen gas into the engine.

7. According to the engine system of claim 6, characterized in that The engine system further includes a gas mixer, the gas mixer is connected to the outlet end of the second branch through a first intake pipe, the first intake pipe is provided with a third on-off valve and a first injection valve, the third on-off valve is used to control the on-off of the first intake pipe, and the first injection valve is used to introduce ammonia gas into the gas mixer after the third on-off valve is opened. The gas mixer is connected to the ammonia decomposition device through a second intake pipe. The second intake pipe is provided with a fourth on-off valve and a second injection valve. The fourth on-off valve is used to control the on-off of the second intake pipe. The second injection valve is used to introduce hydrogen-nitrogen gas into the gas mixer after the fourth on-off valve is opened. The gas mixer is used to mix the hydrogen-nitrogen gas and the ammonia gas into a mixed gas. The gas mixer is connected to the engine through an outlet pipe and can introduce the mixed gas into the engine.

8. A method for starting an engine system, characterized in that, Applied to the engine system as described in claim 6 or 7, the method for starting the engine system includes: In response to a cold start of the engine, obtain the pressure of the liquid ammonia tank and compare the pressure of the liquid ammonia tank with a predetermined value; According to the pressure of the liquid ammonia tank being less than the predetermined value, control the main pipeline to be connected, control the first branch to be connected, and control the first gasification device to pressurize and gasify the liquid ammonia into ammonia gas, so that the ammonia gas enters the liquid ammonia tank through the first pipeline and increases the pressure of the liquid ammonia tank; Control the second gasification device to gasify the liquid ammonia into ammonia gas.

9. The engine system starting method according to claim 8, wherein, The method for starting the engine system further includes: According to the pressure of the liquid ammonia tank being greater than or equal to the predetermined value, control the main pipeline to be connected and control the disconnection of the connection of the first branch; Control the second gasification device to gasify the liquid ammonia into ammonia gas.

10. The engine system starting method according to claim 8, wherein The engine system further includes a radiator. The radiator is connected to the engine in a way that can be switched on and off. The radiator is used to dissipate heat from the cooling water of the engine. The method for starting the engine system further includes: In response to a hot start of the engine, obtain the temperature of the cooling water of the engine; Compare the temperature of the cooling water with a preset value; According to the temperature of the cooling water being greater than the preset value, control the radiator to be connected to the engine; Control the main pipeline to be connected, control the disconnection of the connection of the first branch, and control the second gasification device to gasify the liquid ammonia into ammonia gas; According to the temperature of the cooling water being less than or equal to the preset value, control the disconnection of the radiator from the engine; Control the main pipeline to be connected, control the disconnection of the connection of the first branch, and control the second gasification device to gasify the liquid ammonia into ammonia gas.

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