Ammonia combustion system for internal combustion engine

Abstract

An ammonia combustion system for an internal combustion engine according to the present invention corresponds to an ammonia combustion system for an internal combustion engine using ammonia as the sole fuel. The present invention comprises: an ammonia tank; a plasma cracker unit for decomposing a predetermined portion of ammonia into hydrogen and nitrogen by using electrical energy; a plasma valve; a pyrolysis cracker unit for decomposing a predetermined portion of ammonia into hydrogen and nitrogen at an activation temperature or higher; a pyrolysis valve; and a supply valve for guiding an ammonia mixed gas generated in one of the plasma cracker unit or the pyrolysis cracker unit to an intake pipe of an internal combustion engine.

Description

Ammonia combustion system for internal combustion engines

[0001] The present invention relates to an ammonia combustion system for an internal combustion engine, and more particularly, to an ammonia combustion system for an internal combustion engine that implements a simplified and environmentally friendly system using ammonia as a single fuel.

[0002] Internal combustion engines have traditionally been powered by fossil fuels like gasoline. The use of these fossil fuels has caused serious environmental pollution, and the need to minimize or ban the use of carbon-emitting fossil fuels is growing. Accordingly, various attempts to replace fossil fuels are ongoing.

[0003] While hydrogen is recognized as a leading eco-friendly fuel, it presents various challenges. First, liquefying hydrogen requires extremely low temperatures of -253 degrees Celsius, and transporting liquefied hydrogen is more difficult than transporting LNG gas. Consequently, transportation costs are approximately six times higher than the cost of producing hydrogen.

[0004] Furthermore, when using hydrogen as an internal combustion engine fuel, hydrogen burns seven times faster than gasoline, leading to engine knocking, backfire, and other issues that necessitate a redesign of the internal combustion engine. Furthermore, electric vehicles are being developed that utilize hydrogen in fuel cells and other technologies to replace internal combustion engines, but these vehicles suffer from significant economic and safety issues.

[0005] Ammonia is attracting attention as a hydrogen carrier, offering significant economic advantages over storing or liquefying hydrogen itself at high pressure for transporting blue or green hydrogen to demand locations. Ammonia liquefies at -33°C and remains liquid at around 10 atmospheres, requiring significantly less energy for liquefaction than hydrogen. Transported ammonia can be further decomposed into nitrogen and hydrogen, with the hydrogen purified for use in fuel cells and other applications requiring hydrogen. However, this process poses the problem of additional energy consumption required to produce hydrogen from ammonia.

[0006] Furthermore, ammonia can be directly combusted without being decomposed into hydrogen for easy application in the power generation and transportation sectors. This is preferable because it eliminates the need for energy input to decompose ammonia and storage of hydrogen. However, ammonia burns six times slower than gasoline. Accordingly, existing methods of mixing ammonia with other fuels with faster combustion rates and combusting them have been used to use ammonia as an internal combustion engine fuel. For example, mixing 8 parts of gasoline to 2 parts of ammonia increases the slow combustion rate of ammonia, successfully driving an internal combustion engine. Furthermore, there have been attempts to use a mixture of ammonia and hydrogen as a fuel for internal combustion engines.

[0007] Internal combustion engines using ammonia-based fuels require different types of fuel, necessitating multiple fuel supply systems. Furthermore, this increases manufacturing costs and presents the inconvenience of having to refill different fuel types separately.

[0008] The present invention is intended to satisfy the above-described needs, and its purpose is to provide an ammonia combustion system for an internal combustion engine that uses ammonia as a single fuel.

[0009] In particular, the purpose is to provide an ammonia combustion system for an internal combustion engine that can be used with minimal modification to an existing gasoline internal combustion engine.

[0010] The ammonia combustion system for an internal combustion engine according to the present invention corresponds to an ammonia combustion system for an internal combustion engine that uses ammonia as a single fuel.

[0011] The present invention includes an ammonia tank storing liquid ammonia, a plasma cracker unit that decomposes a portion of the ammonia into hydrogen and nitrogen using electric energy, a plasma valve that opens and closes a passage connecting the ammonia tank and the plasma cracker unit, a pyrolysis cracker unit that decomposes a portion of the ammonia into hydrogen and nitrogen at a temperature higher than an activation temperature, a pyrolysis valve that opens and closes a passage connecting the ammonia tank and the pyrolysis cracker unit, and a supply valve that guides an ammonia mixed gas generated in either the plasma cracker unit or the pyrolysis cracker unit to an intake manifold of an internal combustion engine.

[0012] In addition, the plasma cracker unit may include a plasma cracker that decomposes ammonia using a battery, arc discharge, or dielectric barrier discharge, and a plasma power supply that turns the plasma cracker ON / OFF using electric energy stored in the battery.

[0013] In addition, the thermal decomposition cracker unit may include a thermal decomposition catalyst that activates a decomposition reaction of ammonia at an activation temperature or higher, an exhaust pipe installed adjacent to an exhaust port of an internal combustion engine through which exhaust gas flows, and a thermal decomposition heat exchanger installed so that heat of the exhaust pipe is transferred to the thermal decomposition catalyst.

[0014] In addition, as another embodiment, the pyrolysis cracker unit may include an exhaust pipe installed adjacent to an exhaust port of an internal combustion engine through which exhaust gas flows, a pyrolysis heat exchanger installed so that heat of the exhaust pipe is transferred to ammonia flowing through the pyrolysis valve, and a pyrolysis catalyst that activates a decomposition reaction of ammonia at an activation temperature or higher and decomposes ammonia flowing through the pyrolysis heat exchanger.

[0015] In addition, the method further includes an exhaust temperature sensor that measures the temperature of the exhaust pipe, and when the internal combustion engine is operating in an initial state, the plasma valve is opened and the plasma cracker unit is operated to supply a mixed gas in which a part of ammonia is decomposed into hydrogen and nitrogen to the internal combustion engine, and when the temperature measured by the exhaust temperature sensor is equal to or higher than an activation temperature, the internal combustion engine is converted from an initial state to a normal state, the plasma valve is closed, the operation of the plasma cracker unit is stopped, and the thermal catalyst valve is opened to supply a mixed gas in which a part of ammonia is decomposed into hydrogen and nitrogen to the internal combustion engine, and the supply valve can connect the plasma cracker unit and the intake pipe of the internal combustion engine in the initial state, and can connect the thermal decomposition cracker unit and the intake pipe of the internal combustion engine in the normal state.

[0016] In addition, the ammonia tank may further include a mass flow sensor for measuring the flow rate of ammonia flowing in the ammonia tank, and an ammonia valve for opening and closing a path connecting the mass flow sensor to the ammonia tank.

[0017] In addition, the present invention may further include a mixed gas heat exchanger that cools the high-temperature ammonia mixed gas generated in one of the plasma cracker unit and the thermal decomposition cracker unit that flows through the supply valve to a low temperature and flows into the intake manifold of an internal combustion engine.

[0018] In addition, an ammonia injector may be further included to supply ammonia flowing from the ammonia storage tank to the engine so as to supply separate ammonia to the engine.

[0019] In addition, the hydrogen concentration of the mixed gas passing through the mixed gas heat exchanger can be maintained at a volume concentration of 10% or more and less than 60%.

[0020] The ammonia combustion system for an internal combustion engine according to the present invention utilizes ammonia as its sole fuel, offering the advantage of a simplified and environmentally friendly system. In particular, since only ammonia is required for refueling, it also simplifies fuel supply facilities (gas stations).

[0021] Furthermore, the ammonia combustion system for an internal combustion engine according to the present invention has the advantage of being usable with minimal modifications to existing gasoline internal combustion engines. This is because ammonia has approximately 2.27 times less energy per unit weight than gasoline, and its air-fuel ratio is approximately 2.5 times lower than that of gasoline. In other words, since ammonia's energy density, taking into account the air-fuel ratio, is comparable to that of gasoline, it can be used with minimal modifications to existing gasoline internal combustion engines.

[0022] In addition, the ammonia combustion system for an internal combustion engine of the present invention has the advantage of being able to implement a fuel supply system for an internal combustion engine by increasing the decomposition speed of ammonia using different types of crackers, minimizing external energy required for ammonia decomposition, and simultaneously performing ammonia decomposition without time delay.

[0023] Figure 1 is a schematic diagram of an ammonia combustion system for an internal combustion engine according to one embodiment of the present invention.

[0024] Figure 2 is a drawing showing the initial state in Figure 1.

[0025] Figure 3 is a drawing showing the normal state in Figure 1.

[0026] Figure 4 is a schematic diagram of an ammonia combustion system for an internal combustion engine according to another embodiment of the present invention.

[0027] Figure 5 is a schematic diagram of an ammonia combustion system for an internal combustion engine according to another embodiment of the present invention.

[0028]

[0029] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to the presented embodiments, and those skilled in the art who understand the spirit of the present invention will be able to easily propose other regressive inventions or other embodiments included within the spirit of the present invention by adding, modifying, or deleting other components within the scope of the same spirit. However, this will also be considered to be included within the spirit of the present invention.

[0030] In addition, components having the same function within the same scope of the same idea shown in the drawings of the embodiment are described using the same reference numerals.

[0031] Figure 1 is a schematic diagram of an ammonia combustion system (1) for an internal combustion engine according to one embodiment of the present invention. The ammonia combustion system (1) for an internal combustion engine according to the present invention corresponds to a combustion system that uses ammonia as a sole fuel. That is, the present invention requires only a single fuel tank.

[0032] As illustrated in FIG. 1, the ammonia combustion system (1) for an internal combustion engine of the present invention includes an ammonia tank (10), a plasma cracker unit (20), a pyrolysis cracker unit (40), and a supply valve (60).

[0033] As previously described, a single tank for storing fuel is provided, and the ammonia tank (10) corresponds to this tank. The ammonia tank (10) can store liquid ammonia. Ammonia is an environmentally friendly fuel that does not contain carbon, and thus the combustion system of the present invention and the internal combustion engine connected thereto are environmentally friendly devices that do not emit carbon. In addition, since ammonia is relatively economical and simple to transport and store, fuel charging can be performed efficiently.

[0034] In addition, cracker units for decomposing ammonia are provided in different types. The plasma cracker unit (20) decomposes a certain portion of ammonia into hydrogen and nitrogen using electric energy, and the thermal decomposition cracker unit (40) decomposes a certain portion of ammonia into hydrogen and nitrogen at a temperature above the activation temperature. That is, the present invention includes a plurality of cracker units that decompose ammonia into hydrogen and nitrogen in different ways.

[0035] At this time, the plasma cracker unit (20) and the thermal decomposition cracker unit (40) can be selectively operated. Accordingly, the supply valve (60) can guide the ammonia mixed gas generated in either the plasma cracker unit (20) or the thermal decomposition cracker unit (40) to the intake manifold of the internal combustion engine.

[0036] In addition, the ammonia combustion system (1) for an internal combustion engine of the present invention further includes a plasma valve (30) that opens and closes a passage connecting the ammonia tank (10) and the plasma cracker unit (20), and a thermal decomposition valve (50) that opens and closes a passage connecting the ammonia tank (10) and the thermal decomposition cracker unit (40).

[0037] At this time, the plasma valve (30) and the thermal decomposition valve (50) can be selectively opened and closed. That is, they can be operated in such a way that when one is opened, the other is closed. In summary, when the plasma valve (30) is opened, the thermal decomposition valve (50) is closed and the supply valve (60) can guide the ammonia decomposition gas (mixed gas of ammonia, nitrogen, and hydrogen) generated in the plasma cracker unit (20) to the intake manifold of the internal combustion engine. Conversely, when the thermal decomposition valve (50) is opened, the plasma valve (30) is closed and the supply valve (60) can guide the ammonia mixed gas generated in the thermal decomposition cracker unit (40) to the intake manifold of the internal combustion engine.

[0038] The above plasma cracker unit (20) may include a battery (200), a plasma cracker (210), and a plasma power supply (220).

[0039] The above battery (200) can be understood as a general device that stores a certain amount of electric energy. The plasma cracker (210) corresponds to a device that decomposes ammonia using arc discharge or dielectric barrier discharge. The plasma power supply (220) corresponds to a device that turns the plasma cracker (210) ON / OFF using the electric energy stored in the battery (200). As such, the plasma cracking technology that decomposes ammonia using the electric energy stored in the battery (200) is general, and a detailed description thereof will be omitted.

[0040] The above pyrolysis cracker unit (40) may include a pyrolysis catalyst (400), an exhaust pipe (410), and a pyrolysis heat exchanger (420).

[0041] The above-mentioned thermal decomposition catalyst (400) corresponds to a device that activates the ammonia decomposition reaction at a temperature higher than the activation temperature. For example, the activation temperature may correspond to 600 degrees. The above-mentioned exhaust pipe (410) refers to a predetermined space installed adjacent to the exhaust port of an internal combustion engine and through which exhaust gas flows. The above-mentioned thermal decomposition heat exchanger (420) refers to a device installed so that the heat of the above-mentioned exhaust pipe (410) is transferred to the above-mentioned thermal decomposition catalyst (400).

[0042] At this time, the exhaust pipe (410) and the pyrolysis heat exchanger (420) are described as separate components for convenience of explanation, but may be formed as a single device. For example, the pyrolysis catalyst (400) may be installed at a close distance from the engine exhaust manifold so that heat exchange is performed without lowering the temperature of the exhaust gas. In particular, the exhaust manifold and the pyrolysis catalyst (400) may be formed as an integral body to minimize heat loss.

[0043] In addition, the exhaust gas path and the thermal decomposition catalyst (400) are isolated to prevent the exhaust gas from penetrating into the ammonia path. In this structure, the exhaust pipe (410) and the thermal decomposition heat exchanger (420) may correspond to a portion of the exhaust manifold and an isolated structure.

[0044] The ammonia combustion system (1) for an internal combustion engine of the present invention may further include a mass flow sensor (100) and an ammonia valve (110).

[0045] The mass flow sensor (MFC, 100) above corresponds to a device that measures the flow rate of ammonia flowing in the ammonia tank (10). The mass flow sensor (100) can be controlled so that a mixture of air and ammonia at an appropriate concentration is supplied to the engine. For example, the mass flow sensor (100) can be controlled by an engine control unit (ECU). The ammonia valve (110) can be installed to open and close a flow path connecting the ammonia tank (10) to the mass flow sensor (100).

[0046] The ammonia combustion system (1) for an internal combustion engine of the present invention may further include a mixed gas heat exchanger (70).

[0047] The above mixed gas heat exchanger (70) corresponds to a device that cools the high temperature ammonia mixed gas generated in one of the plasma cracker unit (20) and the thermal decomposition cracker unit (40) through the supply valve (60) to a low temperature and flows it into the intake manifold of an internal combustion engine.

[0048] For example, the above-mentioned mixed gas heat exchanger (70) may be a device that cools ammonia mixed gas using a circulation pump with cooling water of 10 to 60 degrees using a water-cooling method. In addition, the ammonia mixed gas cooled in this way may be mixed with air sucked from the carburetor and supplied to the intake manifold.

[0049] The ammonia combustion system (1) for an internal combustion engine of the present invention may further include various sensors. Specifically, it may further include an exhaust temperature sensor (430) that measures the temperature of the exhaust pipe (410) and a thermal decomposition temperature sensor (440) that measures the temperature of the ammonia mixed gas discharged from the thermal decomposition cracker unit (40).

[0050] The exhaust temperature sensor (430) may also be understood as measuring the temperature of the thermal decomposition catalyst (400). That is, the exhaust temperature sensor (430) may correspond to a device that measures the temperature of the exhaust gas and determines whether it is managed above the activation temperature. In addition, the thermal decomposition temperature sensor (440) may measure the temperature of the ammonia mixed gas partially decomposed in the thermal decomposition catalyst (400) and indirectly determine whether it is heated above the activation temperature.

[0051] In addition, a hydrogen concentration meter (700) and a mixing temperature sensor (710) installed in the mixed gas heat exchanger (70) may be further included. This is to measure the temperature and hydrogen concentration of the ammonia mixed gas flowing in the mixed gas heat exchanger (70) in real time so that an ammonia mixed gas of an appropriate concentration is supplied to the engine.

[0052] At this time, if it is determined that ammonia is being supplied from the mass flow sensor (100), and the temperature of the exhaust temperature sensor (430) is measured to be higher than the activation temperature of the thermal decomposition catalyst (400), and the hydrogen concentration meter (700) measures a hydrogen concentration below a certain level, it can be determined that the life of the thermal decomposition catalyst (400) has ended.

[0053] In addition, the hydrogen concentration of the mixed gas passing through the mixed gas heat exchanger (70) can be maintained at a volume concentration of 10% or more and less than 60%. This is equally applicable to the plasma cracker unit (20) or the thermal decomposition cracker unit (40), and the ammonia decomposition rate is converted into hydrogen concentration, and the hydrogen concentration is maintained at 10% to 60%.

[0054] That is, rather than 100% decomposing ammonia to produce hydrogen to drive an internal combustion engine, only hydrogen of a volume concentration of 10% or more and less than 60% is produced, so that not much energy is consumed in decomposing ammonia. In addition, in the case of the thermal decomposition catalyst (400), it can be implemented as a low-cost catalyst without using expensive metals, thereby further increasing economic efficiency.

[0055] Based on the description of the configuration above, the operation and fuel flow of the ammonia combustion system (1) for an internal combustion engine of the present invention will be described in detail.

[0056] Fig. 2 is a drawing illustrating the initial state in Fig. 1, and Fig. 3 is a drawing illustrating the normal state in Fig. 1. The initial state generally refers to the initial stage after starting the engine, and the normal state refers to the stage to which it transitions after a predetermined period of time has passed from the initial state. In other words, the ammonia combustion system (1) for an internal combustion engine can start in the initial state and transition to the normal state.

[0057] As illustrated in Fig. 2, when the internal combustion engine is operating in its initial state, the plasma valve (30) is opened and the plasma cracker unit (20) is operated to supply a mixed gas in which a portion of ammonia is decomposed into hydrogen and nitrogen to the internal combustion engine. At this time, since the plasma cracker unit (20) immediately decomposes ammonia using electric energy, the internal combustion engine can be operated without any delay.

[0058] In detail, by opening the ammonia valve (110), a certain amount of ammonia flows to the mass flow sensor (100), passes through the plasma valve (30), and moves to the plasma cracker unit (20). The electric energy stored in the battery (200) is converted into the operating power of the plasma cracker (210) in the plasma power supply (220), and the plasma cracker (210) is turned on to decompose ammonia. At this time, the plasma cracker (210) decomposes a certain portion of ammonia into hydrogen and nitrogen, so that the decomposition rate becomes 10 to 60% of the hydrogen concentration.

[0059] The ammonia mixed gas formed in the plasma cracker (210) passes through the supply valve (60) and moves to the mixed gas heat exchanger (70). Then, it passes through the mixed gas heat exchanger (70) and is cooled to a low temperature before being supplied to the intake manifold of an internal combustion engine.

[0060] At this time, the thermal decomposition valve (50) is kept closed, and the supply valve (60) is arranged to guide the ammonia mixed gas generated in the plasma cracker unit (20) to the intake manifold of the internal combustion engine. In this way, when the internal combustion engine is operated and the gas mixed with ammonia and hydrogen begins to combust, the temperature of the exhaust gas gradually rises. Accordingly, when the temperature measured by the exhaust temperature sensor (430) is higher than the activation temperature, the internal combustion engine is converted from the initial state to the normal state.

[0061] As illustrated in Fig. 3, when the internal combustion engine is operating under normal conditions, the thermal decomposition valve (50) is opened and a mixed gas obtained by decomposing a portion of ammonia into hydrogen and nitrogen in the thermal decomposition cracker unit (40) is supplied to the internal combustion engine. At this time, the internal combustion engine can be operated without requiring a separate energy source such as a battery.

[0062] In detail, the plasma valve (30) is closed, the operation of the plasma cracker unit (20) is stopped, and the heat distribution valve (50) is opened. That is, since the plasma cracker unit (20) operates for only a relatively short time in the initial state, the battery (200) can be provided with a relatively small capacity. Accordingly, the combustion system of the present invention can be manufactured to be lighter than a device using an electric vehicle or a hydrogen fuel cell.

[0063] In summary, a constant amount of ammonia continuously flows through the mass flow sensor (100), passes through the thermal decomposition valve (50), and moves to the thermal decomposition cracker unit (40). The thermal decomposition catalyst (400) maintained above the activation temperature decomposes ammonia. At this time, the thermal decomposition catalyst (400) decomposes ammonia into a certain portion of hydrogen and nitrogen, so that the decomposition rate becomes 10 to 60% of the hydrogen concentration.

[0064] The ammonia mixed gas formed in the above thermal decomposition catalyst (400) passes through the supply valve (60) and moves to the mixed gas heat exchanger (70). Then, after passing through the mixed gas heat exchanger (70) and being cooled to a low temperature, it is supplied to the intake manifold of an internal combustion engine.

[0065] The ammonia combustion system (1) for an internal combustion engine of the present invention can operate the engine without any time delay in the initial state, and can be operated without a separate energy source when transitioning to a normal state. In addition, it uses ammonia as a single fuel and, by decomposing a certain portion during operation and providing it as a mixed fuel, it can increase the combustion speed of the ammonia, thereby operating the system effectively.

[0066] Fig. 4 is a schematic diagram of an ammonia combustion system (1a) for an internal combustion engine according to another embodiment of the present invention. The ammonia combustion system (1a) for an internal combustion engine is partially modified from the combustion system (1) described above, and the same components are designated by the same drawing reference numerals, and their descriptions are omitted.

[0067] As shown in Fig. 4, the ammonia combustion system (1a) for the internal combustion engine includes an ammonia tank (10), a plasma cracker unit (20), a plasma valve (30), a pyrolysis cracker unit (40a), a pyrolysis valve (50), and a supply valve (60).

[0068] The above-described pyrolysis cracker unit (40a) may include an exhaust pipe (410) installed adjacent to an exhaust port of an internal combustion engine and through which exhaust gas flows, a pyrolysis heat exchanger (420a) installed so that the heat of the exhaust pipe (410) is transferred to the ammonia flowing through the pyrolysis valve (50), and a pyrolysis catalyst (400) that is provided to activate a decomposition reaction of ammonia at an activation temperature or higher and decomposes the ammonia flowing through the pyrolysis heat exchanger (420a).

[0069] That is, unlike the combustion system (1) described above, the ammonia combustion system (1a) for the internal combustion engine can heat ammonia to a temperature higher than the activation temperature and then supply the high-temperature ammonia to the thermal decomposition catalyst (400). This structure can be formed differently depending on the structure of the internal combustion engine and combustion system.

[0070] Fig. 5 is a schematic diagram of an ammonia combustion system (1b) for an internal combustion engine according to another embodiment of the present invention. The ammonia combustion system (1b) for an internal combustion engine has some additional components compared to the combustion system (1) described above, and the same components are designated by the same drawing reference numerals, and their descriptions are omitted.

[0071] As illustrated in Fig. 5, the ammonia combustion system (1) for an internal combustion engine includes an ammonia tank (10), a plasma cracker unit (20), a plasma valve (30), a pyrolysis cracker unit (40), a pyrolysis valve (50), a supply valve (60), and a mixed gas heat exchanger (70). In addition, the system may further include an ammonia injector (80) that supplies ammonia flowing from the ammonia storage tank (10) to the engine so as to supply separate ammonia to the engine.

[0072] The ammonia injector (80) can supply ammonia to the engine separately from the ammonia mixed gas supplied to the engine through the mixed gas heat exchanger (70). This can increase fuel efficiency and achieve various effects, such as effectively controlling the hydrogen concentration of the ammonia mixed gas.

[0073] Although one embodiment of the present invention has been described in detail above, the scope of the present invention is not limited thereto, and it will be apparent to those skilled in the art that various modifications and variations are possible within a scope that does not depart from the technical spirit of the present invention described in the claims.

Claims

1. In an ammonia combustion system for an internal combustion engine using ammonia as a sole fuel, Ammonia tank where liquid ammonia is stored; A plasma cracker unit that uses electrical energy to decompose a portion of ammonia into hydrogen and nitrogen; A plasma valve for opening and closing a passage connecting the ammonia tank and the plasma cracker unit; A thermal cracker unit that decomposes a portion of ammonia into hydrogen and nitrogen above the activation temperature; A thermal decomposition valve that opens and closes a path connecting the ammonia tank and the thermal decomposition cracker unit; and An ammonia combustion system for an internal combustion engine, comprising a supply valve that guides an ammonia mixture gas generated in one of the plasma cracker unit and the thermal decomposition cracker unit to an intake manifold of the internal combustion engine.

2. In paragraph 1, The above plasma cracker unit, battery; A plasma cracker that decomposes ammonia using arc discharge or dielectric barrier discharge; and A plasma power supply that turns the plasma cracker ON / OFF using electric energy stored in the battery; An ammonia combustion system for an internal combustion engine, characterized by including:

3. In paragraph 2, The above pyrolysis cracker unit, A thermal decomposition catalyst that activates the ammonia decomposition reaction above the activation temperature; An exhaust pipe installed adjacent to the exhaust port of an internal combustion engine and through which exhaust gas flows; and A pyrolysis heat exchanger installed so that the heat of the above exhaust pipe is transferred to the pyrolysis catalyst; An ammonia combustion system for an internal combustion engine, characterized by including:

4. In paragraph 2, The above pyrolysis cracker unit, An exhaust pipe installed adjacent to the exhaust port of an internal combustion engine and through which exhaust gas flows; A pyrolysis heat exchanger installed so that the heat of the exhaust pipe is transferred to the ammonia flowing through the pyrolysis valve; and A thermal decomposition catalyst that is equipped to activate ammonia decomposition reaction above an activation temperature and decomposes ammonia flowing through the thermal decomposition heat exchanger; An ammonia combustion system for an internal combustion engine, characterized by including:

5. In paragraph 3, Further comprising an exhaust temperature sensor for measuring the temperature of the exhaust pipe, When the internal combustion engine is operating in the initial state, the plasma valve is opened and the plasma cracker unit is operated to supply a mixed gas in which a portion of ammonia is decomposed into hydrogen and nitrogen to the internal combustion engine. When the temperature measured by the exhaust temperature sensor is higher than the activation temperature, the internal combustion engine switches from the initial state to the normal state, closes the plasma valve, stops the operation of the plasma cracker unit, and opens the thermal catalyst valve to supply a mixed gas in which a portion of the ammonia is decomposed into hydrogen and nitrogen to the internal combustion engine. An ammonia combustion system for an internal combustion engine, characterized in that the supply valve connects the plasma cracker unit and the intake pipe of the internal combustion engine in the initial state, and connects the pyrolysis cracker unit and the intake pipe of the internal combustion engine in the normal state.

6. In paragraph 5, A mass flow sensor that measures the flow rate of ammonia flowing in the ammonia tank; and An ammonia combustion system for an internal combustion engine further comprising an ammonia valve for opening and closing a passage connecting the mass flow sensor in the ammonia tank.

7. In paragraph 6, An ammonia combustion system for an internal combustion engine further comprising a mixed gas heat exchanger that cools the high-temperature ammonia mixed gas generated in one of the plasma cracker unit and the pyrolysis cracker unit that flows through the supply valve to a low temperature and flows into the intake manifold of the internal combustion engine.

8. In paragraph 7, An ammonia combustion system for an internal combustion engine further comprising an ammonia injector for supplying ammonia flowing from the ammonia storage tank to the engine so as to supply separate ammonia to the engine.

9. In paragraph 7, An ammonia combustion system for an internal combustion engine characterized in that the hydrogen concentration of the mixed gas passing through the above mixed gas heat exchanger is maintained at a volume concentration of 10% or more and less than 60%.

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