Liquid ammonia engine combustion chamber

Abstract

The invention discloses a liquid ammonia engine combustion chamber, which belongs to the technical field of engines and comprises a shell, a combustion chamber assembly arranged in the shell and a spraying assembly arranged at the left end of the shell and inserted into the combustion chamber assembly. A gas collection assembly is arranged outside the combustion chamber assembly and comprises a gas collection pipe arranged outside the combustion chamber assembly in a sleeving mode, and a plurality of exhaust pipes extending into the gas collection pipe are fixedly inserted into the coal combustion chamber assembly in the circumferential direction at equal intervals. Circulating pipes extending into the combustion chamber assembly are inserted into the left side of the gas collecting pipe in the circumferential direction at equal fixed intervals. According to the combustion chamber, through the arrangement of the gas collecting assembly and the circulating pipe, gas in the gas collecting assembly can be guided into the combustion chamber assembly, the entering high-temperature gas can dry liquid ammonia and compressed air which are sprayed and atomized, the moisture content of the liquid ammonia and the moisture content of the compressed air are reduced, and the combustion efficiency is improved. The gas flow speed can be increased, mixing of fuel and air can be promoted, combustion is more sufficient, the flame propagation speed is increased, and therefore the combustion efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a liquid ammonia engine combustion chamber. Background Art

[0002] Ammonia, as an excellent hydrogen carrier, has attracted widespread attention in the international energy sector. Compared to hydrogen, ammonia has a lower liquefaction pressure, making it easier to store and transport. As a mature industrial and agricultural product, ammonia already has a well-established infrastructure for production, storage, and transportation. Ammonia can be synthesized using renewable energy, achieving zero carbon emissions throughout its lifecycle. Ammonia can also be used to replace fossil fuels, addressing energy security and addressing energy crises. In short, ammonia fuel has both the feasibility and value of widespread adoption, and research on its engine applications has become a hot research topic in recent years.

[0003] At present, the common method of using ammonia fuel in research is to pressurize ammonia and store it in liquid phase in a liquid ammonia tank. When ammonia fuel is needed, the liquid ammonia is evaporated into gaseous ammonia through a vaporizer, and the gaseous ammonia is input into the engine combustion chamber through a gas pipeline, a gas flow meter and a gas nozzle.

[0004] The combustion chamber of a liquid ammonia engine is its core part, which is responsible for mixing liquid ammonia with air and igniting it to produce high-temperature and high-pressure gas to drive the piston or turbine to do work.

[0005] After investigation, it was found that in order to solve the pressure generated by the flow of high-temperature gas, the existing liquid ammonia engine combustion chamber will open multiple pressure relief ports on the outer wall of the combustion chamber. Although this can reduce the gas pressure inside the combustion chamber, the discharged high-temperature gas can no longer return to the combustion chamber, which leads to energy loss and is not conducive to energy conservation. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a liquid ammonia engine combustion chamber, which aims to solve the problem of energy loss caused by the high-temperature gas discharged from the existing hydraulic engine combustion chamber under the pressure generated by gas extrusion and cannot be recycled and reused.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: a liquid ammonia engine combustion chamber, comprising:

[0008] shell;

[0009] a combustion chamber assembly disposed within the housing, the combustion chamber assembly comprising a first combustion chamber tube and a third combustion chamber tube respectively fixed to opposite ends of the housing, wherein a plurality of second combustion chamber tubes connected to each other are fixedly connected between the first combustion chamber tube and the third combustion chamber tube; wherein the first combustion chamber tube is provided with a plurality of first pressure relief ports, and the second combustion chamber tube is provided with a plurality of third pressure relief ports on the left side thereof;

[0010] A spray assembly is provided at the left end of the housing and is plugged into the combustion chamber assembly;

[0011] The exhaust pipe is connected to the exhaust gas pipe at the rear of the combustion chamber, and the exhaust pipe is connected to the exhaust gas pipe at a constant distance from the exhaust port.

[0012] The cooling component includes a cooling pipe arranged on the outer shell and a honeycomb ceramic filler filled between the outer shell and the gas collecting component; the honeycomb ceramic filler can absorb heat from the outer wall of the combustion chamber component, and then the absorbed cold air can be used to cool the outer wall of the combustion chamber component. By cooling the outside of the combustion chamber component, the temperature of the local area can be lowered, reducing the danger caused by rapid gasification after ammonia leakage, enhancing safety, improving efficiency, and extending the service life of the equipment.

[0013] Furthermore, the first combustion chamber tube is in an expanded diameter shape, and the internal diameter of the first combustion chamber tube is larger than the diameter of its two end ports; the second combustion chamber tube is in a conical shape, and the diameter of the left end of the second combustion chamber tube is larger than the diameter of the right end; the third combustion chamber tube is in a conical shape, and the diameter of the left end of the third combustion chamber tube is smaller than the diameter of the right end; by utilizing the special shapes of the first combustion chamber tube, the second combustion chamber tube and the third combustion chamber tube, the flow rate of the high-temperature combustion gas can be changed while the extrusion between the gases can be reduced to avoid gas backflow.

[0014] Furthermore, a pressure relief pipe is fixedly connected to the left side of the first combustion chamber tube, and an auxiliary installation pipe is fixedly connected to the inside of the pressure relief pipe. The auxiliary installation pipe is used to position and fix the spray assembly.

[0015] Furthermore, both ends of the pressure relief pipe are tapered, the outside of the pressure relief pipe is U-shaped, and the connection between the auxiliary mounting pipe and the pressure relief pipe is V-shaped, which facilitates damping and guiding the rebounding gas.

[0016] Furthermore, a pressure relief cavity is formed between the pressure relief pipe and the first combustion chamber pipe, a plurality of fourth pressure relief ports are opened circumferentially on the pressure relief pipe, and a plurality of second pressure relief ports are opened circumferentially on the first combustion chamber pipe, and the second pressure relief ports are used to relieve pressure on the gas in the pressure relief cavity to improve the safety of gas combustion.

[0017] Furthermore, turbine blades are rotatably arranged at the connection between the second combustion chamber tube and the third combustion chamber tube. The turbine blades will rotate under the action of high-temperature gas, and then the high-temperature gas can be guided by the turbine blades while also increasing the flow rate of the gas, thereby avoiding the high-temperature gas from staying briefly in the combustion chamber assembly and causing the pressure in the combustion chamber assembly to increase.

[0018] Furthermore, the gas collecting assembly also includes a first gas duct, a second gas duct and a third gas duct. The first gas duct is fixed at the left end of the gas collecting pipe and fixed to the left side of the first combustion chamber pipe. The second gas duct is fixed at the right end of the gas collecting pipe and is sleeved on the outside of the second combustion chamber pipe. The third gas duct is sleeved on the left side of the third combustion chamber pipe and fixed to the right end of the second gas duct.

[0019] Furthermore, the gas collecting pipe is located on the right side outside the first combustion chamber pipe and outside the second combustion chamber pipe.

[0020] Furthermore, the shape of the first air duct is consistent with the shape of the left side of the outside of the first combustion chamber tube, the shape of the second air duct is consistent with the shape of the outside of the second combustion chamber tube, and the shape of the third air duct is consistent with the shape of the left side of the outside of the third combustion chamber tube; it is convenient to guide the high-temperature gas discharged from the combustion chamber assembly into the collecting pipe, and at the same time, the excess gas will flow into the third air duct, and then the high-temperature gas entering the collecting pipe will be introduced into the third combustion chamber tube through the exhaust pipe through the gas drainage in the third combustion chamber tube, thereby accelerating the discharge of the burned high-temperature gas.

[0021] Furthermore, the spray assembly includes a spray pipe, which is installed at the left end of the shell and fixedly inserted in the auxiliary installation pipe, and the left end of the spray pipe is fixedly inserted with a liquid ammonia supply pipe, a combustion-supporting material supply pipe and a compressed air supply pipe, and a combustion-supporting material atomizing pipe connected to the combustion-supporting material supply pipe is opened in the middle of the right end of the spray pipe, and a plurality of liquid ammonia atomizing pipes and compressed air atomizing pipes are opened in the circumferential direction on the right end side of the spray pipe, and the liquid ammonia atomizing pipes and the compressed air atomizing pipes are opened in an staggered manner, and atomizing nozzles are installed at the ports of the atomizing pipes; the atomized combustion-supporting material sprayed out through the combustion-supporting material atomizing pipe located in the middle can effectively ignite the atomized liquid ammonia and compressed air sprayed from the liquid ammonia atomizing pipe and the compressed air atomizing pipe on its surrounding side, and the staggered liquid ammonia atomizing pipe and the compressed air atomizing pipe can accelerate the mixing of the atomized liquid ammonia and the atomized compressed air, improve the mixing reaction of the liquid ammonia and the compressed air, and improve the combustion efficiency.

[0022] The beneficial effects of the present invention are: the combustion chamber of the present invention is equipped with a gas collecting assembly, which facilitates the pressure relief of the high pressure generated by the mutual squeezing of the gas combustion flow, prevents container rupture or explosion accidents caused by excessive pressure, extends the service life of the equipment, and ensures the safety of personnel and facilities; at the same time, by utilizing the exhaust pipe to guide the gas in the third combustion chamber pipe, the high-temperature gas entering the gas collecting pipe can be introduced into the third combustion chamber pipe, thereby accelerating the discharge of the burned high-temperature gas, increasing the output power of the engine, and achieving the purpose of recovering and reusing the burned high-temperature gas.

[0023] Through the circulation pipe provided in the combustion chamber of the present invention, the gas in the gas collecting assembly is introduced into the combustion chamber assembly. The incoming high-temperature gas can dry the sprayed atomized liquid ammonia and compressed air, reduce the moisture content of the liquid ammonia and compressed air, accelerate the gas flow rate, promote the mixing of fuel and oxidant (such as air), make the combustion more complete, increase the flame propagation speed, thereby improving the combustion efficiency, increasing the output power of the engine, enhancing the cooling effect, reducing carbon deposits and deposition, and achieving the purpose of recovering and reusing the burned high-temperature gas.

[0024] By using the cooling component provided in the combustion chamber of the present invention, honeycomb ceramic filler is used to absorb heat from the outer wall of the combustion chamber component, and then the absorbed cold air is used to cool the outer wall of the combustion chamber component. By cooling the outside of the combustion chamber component, the temperature of the local area can be lowered, reducing the danger caused by rapid gasification after ammonia leakage, enhancing safety, improving efficiency, and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the liquid ammonia engine combustion chamber;

[0026] Figure 2 This is the main cross-sectional view of the liquid ammonia engine combustion chamber;

[0027] Figure 3 for Figure 2 Main view of the structure;

[0028] Figure 4 It is the right view of the spray assembly structure;

[0029] Figure 5 This is the right side view of the overall structure of the liquid ammonia engine combustion chamber;

[0030] Figure 6 Schematic diagram of the connection structure between the gas collecting assembly and the combustion chamber assembly;

[0031] Figure 7 Schematic diagram of the combustion chamber assembly structure;

[0032] Figure 8This is the main cross-sectional view of the combustion chamber assembly;

[0033] Figure 9 Schematic diagram of the gas collection assembly structure;

[0034] Figure 10 This is the main cross-sectional view of the structure of the gas collection assembly;

[0035] In the figure: 1. outer shell; 2. combustion chamber assembly; 21. first combustion chamber tube; 211. first pressure relief port; 212. second pressure relief port; 22. second combustion chamber tube; 221. third pressure relief port; 23. third combustion chamber tube; 24. pressure relief pipe; 241. fourth pressure relief port; 25. auxiliary mounting pipe; 26. turbine blade; 3. spray assembly; 31. spray pipe; 32. liquid ammonia supply pipe; 321. liquid ammonia atomization pipe; 33. combustion-supporting material supply pipe; 331. combustion-supporting material atomization pipe; 34. compressed air supply pipe; 341. compressed air atomization pipe; 4. gas collecting assembly; 41. gas collecting pipe; 42. first air duct; 43. second air duct; 44. third air duct; 45. circulation pipe; 46. exhaust pipe; 5. cooling pipe; 6. honeycomb ceramic filler. DETAILED DESCRIPTION

[0036] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] Example 1

[0038] The embodiment of the present invention provides a liquid ammonia engine combustion chamber, such as Figure 1-10 As shown, the combustion chamber includes a shell 1, a combustion chamber assembly 2 arranged in the shell 1, and a spray assembly 3 arranged at the left end of the shell 1 and plugged into the combustion chamber assembly 2;

[0039] The combustion chamber assembly 2 includes a first combustion chamber tube 21 and a third combustion chamber tube 23 respectively fixed at both ends of the housing 1, and a plurality of second combustion chamber tubes 22 connected to each other are fixedly connected between the first combustion chamber tube 21 and the third combustion chamber tube 23;

[0040] Among them, reference Figure 2 、 Figure 3 、 Figure 7 and Figure 8As shown, the first combustion chamber tube 21 is in an expanded diameter shape, and the internal diameter of the first combustion chamber tube 21 is larger than the diameter of its two end ports; the second combustion chamber tube 22 is in a conical shape, and the diameter of the left end of the second combustion chamber tube 22 is larger than the diameter of the right end; the third combustion chamber tube 23 is in a conical shape, and the diameter of the left end of the third combustion chamber tube 23 is smaller than the diameter of the right end; the special shapes of the first combustion chamber tube 21, the second combustion chamber tube 22 and the third combustion chamber tube 23 can change the flow rate of the high-temperature combustion gas while reducing the extrusion between the gases, and avoid the backflow of the gas. At the same time, it can also perform a pressure relief operation on the high pressure generated by the extrusion between the gases by cooperating with the pressure relief port.

[0041] Reference Figure 2 、 Figure 3 and Figure 7 As shown, a plurality of first pressure relief ports 211 are opened on the first combustion chamber tube 21, and a plurality of third pressure relief ports 221 are opened on the left end side of the second combustion chamber tube 22; the port diameter of the first pressure relief port 211 is twice the port diameter of the third pressure relief port 221.

[0042] Reference Figure 2 、 Figure 3 and Figure 8 As shown, a pressure relief pipe 24 is fixedly connected to the left side of the first combustion chamber tube 21, and an auxiliary mounting pipe 25 for positioning and fixing the spray assembly 3 is fixedly connected inside the pressure relief pipe 24; both ends of the pressure relief pipe 24 have conical pipe mouths, the outside of the pressure relief pipe 24 is U-shaped, and the connection between the auxiliary mounting pipe 25 and the pressure relief pipe 24 is V-shaped, which is convenient for damping and guiding the rebounding gas.

[0043] A pressure relief chamber is formed between the pressure relief pipe 24 and the first combustion chamber pipe 21. A plurality of fourth pressure relief ports 241 are opened circumferentially on the pressure relief pipe 24, and a plurality of second pressure relief ports 212 are opened circumferentially on the first combustion chamber pipe 21 for relieving the pressure of the gas in the pressure relief chamber. The fourth pressure relief ports 241 cooperate with the pressure relief chamber to relieve the pressure of the gas caused by the initial combustion, and the second pressure relief ports 212 can be used to relieve the pressure of the high-temperature gas inside the pressure relief chamber, thereby further improving the safety of gas combustion.

[0044] Reference Figure 2 、 Figure 3 and Figure 8 As shown, turbine blades 26 are rotatably provided at the connection between the second combustion chamber tube 22 and the third combustion chamber tube 23; the turbine blades 26 will rotate under the action of the high-temperature gas, and then the turbine blades 26 can guide the high-temperature gas while also increasing the flow rate of the gas, thereby avoiding the high-temperature gas from staying briefly in the combustion chamber assembly 2 and causing the pressure in the combustion chamber assembly 2 to increase.

[0045] The outside of the combustion chamber assembly 2 is provided with a gas collecting assembly 4 for collecting the high-temperature gas discharged from the pressure relief port. The gas collecting assembly 4 includes a gas collecting pipe 41 sleeved on the outside of the combustion chamber assembly 2, and the gas collecting pipe 41 is located on the right side of the outside of the first combustion chamber pipe 21 and the outside of the second combustion chamber pipe 22; a plurality of exhaust pipes 46 extending into the gas collecting pipe 41 are fixedly connected at equal intervals on the left side of the third combustion chamber pipe 23, and the ends of the exhaust pipes 46 correspond to the right end of the outer shell 1; the gas collecting assembly 4 is used to conveniently relieve the high pressure generated by the mutual squeezing of the gas combustion flow, prevent container rupture or explosion accidents caused by excessive pressure, extend the service life of the equipment, ensure the safety of personnel and facilities, and perform reasonable pressure relief operations on the liquid ammonia engine combustion chamber, which is the basis for ensuring the safe, stable and efficient operation of the system, and is also an effective means to maintain the safety of operators and reduce operating costs; at the same time, by utilizing the exhaust pipe 46 to guide the gas in the third combustion chamber pipe 23, the high-temperature gas entering the gas collecting pipe 41 can be introduced into the third combustion chamber pipe 23, thereby accelerating the discharge of the burning high-temperature gas.

[0046] Among them, the gas collecting assembly 4 also includes a first gas guide pipe 42 fixed at the left end of the gas collecting pipe 41 and fixed to the left side of the first combustion chamber pipe 21, the right end of the gas collecting pipe 41 is fixedly connected to a second gas guide pipe 43 which is sleeved on the outside of the second combustion chamber pipe 22, and the left side of the third combustion chamber pipe 23 is fixedly sleeved with a third gas guide pipe 44 which is fixedly connected to the right end of the second gas guide pipe 43.

[0047] The shape of the first air duct 42 is consistent with the shape of the left side of the outside of the first combustion chamber tube 21, the shape of the second air duct 43 is consistent with the shape of the outside of the second combustion chamber tube 22, and the shape of the third air duct 44 is consistent with the shape of the left side of the outside of the third combustion chamber tube 23; it is convenient to guide the high-temperature gas discharged from the combustion chamber assembly 2 into the collecting pipe 41, and at the same time, the excess gas will flow into the third air duct 44, and then through the exhaust pipe 46 through the gas drainage in the third combustion chamber tube 23, the high-temperature gas entering the collecting pipe 41 can be introduced into the third combustion chamber tube 23, thereby accelerating the discharge of the burned high-temperature gas.

[0048] Among them, a number of circulation pipes 45 are inserted at equal fixed intervals on the left side of the gas collecting pipe 41. The circulation pipe 45 is fixedly inserted into the left side of the first combustion chamber pipe 21, and the end of the circulation pipe 45 corresponds to the right end of the shell 1; the gas in the gas collecting pipe 41 can be introduced into the first combustion chamber pipe 21 by using the circulation pipe 45 to drain the gas in the first combustion chamber pipe 21, and the incoming high-temperature gas can dry the sprayed liquid ammonia and compressed air, reduce the moisture content of the liquid ammonia and compressed air, help to form a more stable flame, and improve the stability and efficiency of combustion; reducing the moisture content can reduce corrosion and fouling problems on the combustion equipment, extend the life of the equipment, and reduce safety hazards; the drying process helps to control the humidity during the combustion process, avoid Avoid the adverse effects of moisture, such as condensation, pipe blockage or impact on the fuel injection system; the incoming high-temperature gas can also increase the gas flow rate in the first combustion chamber tube 21. Increasing the gas flow rate can promote the mixing of fuel and oxidant (such as air), make combustion more complete, increase the flame propagation speed, thereby improving combustion efficiency and increasing the engine's output power; fast-flowing gas can more effectively take away the heat generated in the combustion chamber, help maintain the combustion chamber wall temperature within a reasonable range, and prevent overheating, which is crucial to protecting the combustion chamber material and extending its service life; increasing the flow rate can reduce local hot spots in the combustion chamber, reduce the possibility of unburned fuel deposition and carbon deposits, keep the combustion chamber clean, and maintain engine performance.

[0049] The spray assembly 3 includes a spray pipe 31 installed at the left end of the shell 1 and fixedly plugged into the auxiliary installation pipe 25. The left end of the spray pipe 31 is fixedly plugged with a liquid ammonia supply pipe 32, a combustion-supporting material supply pipe 33 and a compressed air supply pipe 34. A combustion-supporting material atomizing pipe 331 connected to the combustion-supporting material supply pipe 33 is opened in the middle of the right end of the spray pipe 31. A plurality of liquid ammonia atomizing pipes 321 and compressed air atomizing pipes 341 are opened circumferentially on the side of the right end of the spray pipe 31, and the liquid ammonia atomizing pipe 321 and the compressed air atomizing pipe 341 are connected to the combustion-supporting material supply pipe 33. 41 are staggered, and atomizing nozzles are installed at the ends of the atomizing pipes; the atomized combustible material sprayed out through the combustible material atomizing pipe 331 located in the middle can effectively ignite the atomized liquid ammonia and compressed air sprayed out from the liquid ammonia atomizing pipe 321 and the compressed air atomizing pipe 341 on its surrounding sides. The staggered liquid ammonia atomizing pipe 321 and the compressed air atomizing pipe 341 can accelerate the mixing of the atomized liquid ammonia and the atomized compressed air, improve the mixing reaction of the liquid ammonia and the compressed air, and improve the combustion efficiency.

[0050] Example 2

[0051] Reference Figure 1 、 Figure 2 and Figure 3As shown, a liquid ammonia engine combustion chamber has a cooling component provided on the outer shell 1. The cooling component includes a cooling pipe 5 fixedly plugged into the outer shell 1, and a honeycomb ceramic filler 6 is filled between the outer shell 1 and the gas collecting component 4. When in use, the cooling pipe 5 is connected to the external cooling system, and the honeycomb ceramic filler 6 can absorb heat from the outer wall of the combustion chamber component 2, and then the absorbed cold air can achieve the effect of cooling the outer wall of the combustion chamber component 2. At the same time, when ammonia leaks, if the ambient temperature is too high, the ammonia vaporization rate may be accelerated, the ammonia concentration may be increased, and the explosion risk may be increased. By cooling the outside of the combustion chamber component, the temperature of the local area can be reduced, reducing the danger caused by the rapid vaporization of ammonia after leakage; maintaining a suitable operating temperature helps to improve the overall efficiency of the engine; cooling can also reduce heat radiation to the external environment, protect surrounding equipment and structures from heat damage, and provide a safer working environment for operators; enhance safety, improve efficiency, and extend the service life of equipment.

[0052] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A liquid ammonia engine combustion chamber, characterized in that: include: Housing (1); A combustion chamber assembly (2) is arranged inside the housing (1), and the combustion chamber assembly (2) comprises a first combustion chamber tube (21) and a third combustion chamber tube (23) respectively fixed to two ends of the housing (1), wherein a plurality of second combustion chamber tubes (22) connected to each other are fixedly connected between the first combustion chamber tube (21) and the third combustion chamber tube (23); wherein the first combustion chamber tube (21) is provided with a plurality of first pressure relief ports (211), and the left side of the second combustion chamber tube (22) is provided with a plurality of third pressure relief ports (221); A spray assembly (3) is arranged at the left end of the housing (1) and inserted into the combustion chamber assembly (2); A gas collecting assembly (4) is arranged outside the housing (1) and is used to collect high-temperature gas discharged from the pressure relief port; the gas collecting assembly (4) includes a gas collecting pipe (41), the gas collecting pipe (41) is sleeved outside the combustion chamber assembly (2), a plurality of exhaust pipes (46) are equidistantly inserted at the left side of the third combustion chamber pipe (23), and the exhaust pipes (46) are in communication with the gas collecting pipe (41); a plurality of circulation pipes (45) are equidistantly inserted at the left side of the first combustion chamber pipe (21), and the circulation pipes (45) are in communication with the gas collecting pipe (41); The cooling component comprises a cooling pipe (5) arranged on the shell (1) and a honeycomb ceramic filler (6) filled between the shell (1) and the gas collecting component (4).

2. The liquid ammonia engine combustion chamber according to claim 1, characterized in that: The first combustion chamber tube (21) is in an expanded diameter shape, and the inner diameter of the first combustion chamber tube (21) is larger than the diameters of the ports at both ends thereof; The second combustion chamber tube (22) is in a conical shape, and the diameter of the left end of the second combustion chamber tube (22) is larger than the diameter of the right end; The third combustion chamber tube (23) is in a conical shape, and the diameter of the left end of the third combustion chamber tube (23) is smaller than the diameter of the right end.

3. The liquid ammonia engine combustion chamber according to claim 1, characterized in that: A pressure relief pipe (24) is fixedly connected to the left side of the first combustion chamber pipe (21), and an auxiliary installation pipe (25) is fixedly connected inside the pressure relief pipe (24). The auxiliary installation pipe (25) is used to position and fix the spray assembly (3).

4. The liquid ammonia engine combustion chamber according to claim 3, characterized in that: Both ends of the pressure relief pipe (24) are in the shape of a tapered pipe mouth, the outside of the pressure relief pipe (24) is in a U shape, and the connection between the auxiliary installation pipe (25) and the pressure relief pipe (24) is in a V shape.

5. The liquid ammonia engine combustion chamber according to claim 4, characterized in that: A pressure relief cavity is formed between the pressure relief pipe (24) and the first combustion chamber pipe (21); a plurality of fourth pressure relief ports (241) are circumferentially opened on the pressure relief pipe (24); a plurality of second pressure relief ports (212) are circumferentially opened on the first combustion chamber pipe (21); the second pressure relief ports (212) are used to relieve pressure on gas in the pressure relief cavity.

6. The liquid ammonia engine combustion chamber according to claim 1, characterized in that: Turbine blades (26) are rotatably arranged in the connection between the second combustion chamber tube (22) and the third combustion chamber tube (23).

7. The liquid ammonia engine combustion chamber according to claim 1, characterized in that: The gas collecting assembly (4) further comprises a first gas guide pipe (42), a second gas guide pipe (43) and a third gas guide pipe (44); the first gas guide pipe (42) is fixed to the left end of the gas collecting pipe (41) and is fixed to the left side of the first combustion chamber pipe (21); the second gas guide pipe (43) is fixed to the right end of the gas collecting pipe (41) and is sleeved on the outside of the second combustion chamber pipe (22); the third gas guide pipe (44) is sleeved on the left side of the third combustion chamber pipe (23) and is fixed to the right end of the second gas guide pipe (43).

8. The liquid ammonia engine combustion chamber according to claim 7, characterized in that: The gas collecting pipe (41) is located on the right side of the outside of the first combustion chamber pipe (21) and outside of the second combustion chamber pipe (22).

9. The liquid ammonia engine combustion chamber according to claim 7, characterized in that: The shape of the first air guide pipe (42) is consistent with the shape of the left side of the outside of the first combustion chamber pipe (21), the shape of the second air guide pipe (43) is consistent with the shape of the outside of the second combustion chamber pipe (22), and the shape of the third air guide pipe (44) is consistent with the shape of the left side of the outside of the third combustion chamber pipe (23).

10. The liquid ammonia engine combustion chamber according to claim 1, characterized in that: The spray assembly (3) comprises a spray pipe (31), which is mounted on the left end of the housing (1) and fixedly plugged into the auxiliary mounting pipe (25); a liquid ammonia supply pipe (32), a combustion-supporting material supply pipe (33) and a compressed air supply pipe (34) are fixedly plugged into the left end of the spray pipe (31); a combustion-supporting material atomizing pipe (321) communicating with the combustion-supporting material supply pipe (33) is provided in the middle of the right end of the spray pipe (31); a plurality of liquid ammonia atomizing pipes (331) and compressed air atomizing pipes (341) are circumferentially provided on the side of the right end of the spray pipe (31), and the liquid ammonia atomizing pipes (331) and the compressed air atomizing pipes (341) are staggered; and atomizing nozzles are installed at the ends of the atomizing pipes.

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