Marine combustion type escape ammonia treatment system and method

Abstract

The invention discloses a marine combustion type escaped ammonia treatment system, which is characterized by comprising an escaped ammonia collection device, an ammonia gas buffer tank, a mixed combustor, a combustor air supply machine, a diesel oil cabin, a nitrogen storage tank, a flue gas mixing cavity, an ammonia fuel main machine and a waste gas boiler. Compared with a water absorption treatment mode, a combustion type escape ammonia treatment mode is adopted, a cabin for storing absorbed ammonia wastewater does not need to be arranged in a ship body structure, most of related equipment can be placed in a cabin shed area above a main deck with relatively redundant space, and a large amount of space in a cabin can be saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of shipbuilding, and in particular relates to a system and method for treating marine combustion-type escaped ammonia. Background Art

[0002] To meet the requirements of the IMO's net-zero emissions roadmap for the shipping industry, the research and development and application of new alternative fuels are receiving increasing attention. Ammonia is an ideal zero-carbon alternative fuel due to its carbon dioxide-free combustion, more flexible storage conditions than LNG, and a well-developed ammonia industry chain.

[0003] WinGD and MAN ES, the world's two leading low-speed engine patent holders, have both launched marine engines using ammonia as fuel. Domestic and international manufacturers have also developed corresponding ammonia fuel supply systems for these engines. However, due to the start-up and shutdown purge processes of ammonia-fueled engines, local pressure fluctuations in the ammonia fuel supply system, and the inherent vaporization of ammonia, the system inevitably produces fugitive ammonia gas during operation that cannot be returned to the supply pipeline as liquid fuel. To prevent personnel harm from leaking ammonia and environmental damage, this fugitive ammonia must be collected and treated. The current mainstream collection method for this fugitive ammonia is a water absorption system, which dissolves the gas in a closed water tank and then discharges it into a sealed compartment after the concentration reaches a certain threshold. A drawback of this approach is that large quantities of fresh water are required to absorb and dilute the ammonia solution. For long-haul vessels, sufficient capture capacity requires ample structural space within the hull, and the compartment walls require special coatings. Furthermore, the ammonia neutralization agent is toxic, posing a risk of exposure to crew members during operation. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and to provide a system and method for treating ship-used combustion-type fugitive ammonia. The method of the present invention adopts a combustion-type fugitive ammonia treatment method. Compared with the water absorption treatment method, there is no need to set up a compartment in the hull structure to store the absorbed ammonia wastewater. Most of the equipment involved can be placed in the engine room shed area above the main deck where there is relatively spare space, which can save a lot of space in the engine room.

[0005] In order to achieve the above invention purpose, the technical solution provided by the patent of this invention is as follows:

[0006] A marine combustion-type fugitive ammonia treatment system, comprising a fugitive ammonia collection device, an ammonia buffer tank, a mixing burner, a burner air supply fan, a diesel tank, a nitrogen storage tank, a flue gas mixing chamber, an ammonia fuel main engine and an exhaust gas boiler;

[0007] The escaped ammonia collection device is connected to the ammonia cache tank through a pipeline, and an ammonia compressor is provided on the pipeline connecting the escaped ammonia collection device and the ammonia cache tank. The ammonia cache tank is connected to the mixed burner inlet through an ammonia supply pipeline, and an ammonia shut-off valve is provided on the ammonia supply pipeline. An ammonia pressure control valve is provided on the ammonia supply pipeline near the mixed burner inlet;

[0008] The diesel tank is connected to the mixed burner inlet through a diesel supply pipeline, a burner diesel supply pump is provided on the diesel supply pipeline, and an oil supply valve is provided on the diesel supply pipeline at the mixed burner inlet. The diesel tank supplies oil to the mixed burner through the burner diesel supply pump;

[0009] The burner air supply fan is connected to the mixed burner inlet through an air supply pipeline. The air supply pipelines at the burner air supply fan outlet and the mixed burner inlet are respectively provided with air supply valves. The burner air supply fan supplies combustion air to the mixed burner through the air supply pipeline.

[0010] The outlet of the mixed burner is connected to the flue gas mixing chamber through a flue gas pipeline. An ammonia concentration sensor and a flue gas outlet valve are provided on the flue gas pipeline. The high-temperature flue gas generated in the mixed burner flows into the flue gas mixing chamber through the flue gas pipeline.

[0011] The ammonia fuel main engine is connected to the flue gas mixing chamber through an exhaust pipe, and the combustion exhaust gas of the ammonia fuel main engine enters the flue gas mixing chamber through the exhaust pipe;

[0012] The flue gas mixing chamber is connected to the exhaust gas boiler. The combustion exhaust gas of the ammonia fuel main engine and the high-temperature flue gas are mixed in the flue gas mixing chamber and then sent to the exhaust gas boiler heat source;

[0013] The nitrogen storage tank is connected to the ammonia supply pipeline, air supply pipeline and flue gas pipeline through purge pipelines, and purge valves are respectively provided on the purge pipelines. The fugitive ammonia collection device is connected to the ammonia supply pipeline, air supply pipeline and flue gas pipeline through ventilation pipelines, and ventilation valves are respectively provided on the ventilation pipelines. The fugitive ammonia collection device collects fugitive ammonia from the ammonia supply pipeline, air supply pipeline and flue gas pipeline.

[0014] Furthermore, the escaped ammonia collection device is also connected to the main engine and the main engine ammonia fuel supply device to collect the escaped ammonia from the main engine and the main engine ammonia fuel supply device.

[0015] Furthermore, two burner air supply fans are arranged in parallel, and the two burner air supply fans serve as backup for each other. The capacity of a single burner air supply fan meets the combustion air supply volume of the mixed burner under 100% load.

[0016] Furthermore, the mixed burner includes a pre-combustion chamber and a main combustion chamber. The bottom of the pre-combustion chamber is connected to the diesel supply pipeline, and the pre-combustion chamber and the main combustion chamber are respectively connected to the air supply pipeline. The ammonia supply pipeline is connected to the main combustion chamber. The ignition oil rain is supplied through the diesel tank. The burner air supply fan provides a part of the pre-combustion air to generate a pre-combustion flame in the pre-combustion chamber. Ammonia is sprayed into the main combustion chamber through the ammonia supply pipeline. At the same time, the burner air supply fan provides combustion air to the main combustion chamber, and the pre-combustion flame ignites and fully burns to form a main combustion flame, and finally generates high-temperature flue gas.

[0017] A method for treating ammonia escaped from combustion in a ship, and a system for treating ammonia escaped from combustion in a ship, the method specifically comprising the following steps:

[0018] S1, the ship control system confirms that the last nitrogen purge procedure is completed and the shut-off valves of each pipeline are in the closed state;

[0019] S2, the control system confirms that the ammonia buffer tank pressure is greater than 8 barg, the nitrogen storage tank pressure is greater than 10 barg, the diesel tank low level alarm is not triggered, and the burner air supply fan and burner diesel supply pump are in standby mode;

[0020] S3, start the burner air supply fan, open the air supply valve near the mixed burner inlet and the air supply valve at the burner air supply fan outlet, and the burner air supply fan supplies air to the mixed burner through the air supply pipeline;

[0021] S4, start the burner diesel supply pump, open the fuel supply valve on the diesel supply pipeline to supply diesel to the mixing burner, form a pre-combustion flame in the pre-combustion chamber of the mixing burner, and open the flue gas outlet valve at the same time;

[0022] S5, after the pre-combustion flame starts for a certain period of time, the ammonia shut-off valve is opened, and the ammonia pressure is adjusted by the ammonia pressure control valve, and then ammonia is sprayed into the main combustion chamber of the mixed burner to form a main combustion flame, and finally generate high-temperature flue gas;

[0023] S6, the ammonia concentration sensor on the flue gas pipeline detects the high-temperature flue gas to determine whether the ammonia concentration in the high-temperature flue gas is higher than 20PPM;

[0024] S7: When the ammonia concentration of the high-temperature flue gas in the flue gas pipeline is lower than 20 PPM, the pressure in the ammonia buffer tank is detected to be lower than 5 barg. When the pressure in the ammonia buffer tank is lower than 5 barg, the system maintains the running state; when the pressure in the ammonia buffer tank is higher than 5 barg, the flue gas outlet valve, the air supply valve, the oil supply valve and the ammonia shut-off valve on the air supply pipeline are disconnected;

[0025] S8, when the ammonia concentration of the high-temperature flue gas in the flue gas pipeline is higher than 20 PPM, disconnect the flue gas outlet valve, the air supply valve, the oil supply valve and the ammonia shut-off valve on the air supply pipeline;

[0026] S9, after the flue gas outlet valve, the air supply valve, the oil supply valve, and the ammonia shut-off valve on the air supply pipeline are disconnected, the purge valve on the purge pipeline and the vent valve on the vent pipeline are opened, and nitrogen is blown from the nitrogen storage tank into the ammonia supply pipeline, the air supply pipeline, and the flue gas pipeline through the purge pipeline, and then discharged into the escaped ammonia collection device through the vent pipeline, completing the collection of the escaped ammonia;

[0027] S10, after purging for 600 seconds, close the purge valve and the vent valve, reset the control system, and return to the standby state.

[0028] Furthermore, 30 seconds after the pre-combustion flame is started, the ammonia shut-off valve is opened, and the ammonia pressure control valve adjusts the ammonia pressure to 3 barg.

[0029] Based on the above technical solution, the present invention's patented system and method for treating marine combustion-type escaped ammonia has achieved the following technical advantages through practical application:

[0030] 1. The present invention is a method for treating ship-used combustion-type fugitive ammonia. By adopting a combustion-type fugitive ammonia treatment method, compared with a water absorption treatment method, there is no need to set up a compartment in the hull structure to store the absorbed ammonia wastewater. Most of the equipment involved can be placed in the engine room shed area above the main deck where there is relatively abundant space, which can save a lot of space in the engine room.

[0031] 2. The present invention provides a method for treating ammonia escape from marine combustion. By mixing the high-temperature flue gas generated by combustion with the low-temperature exhaust gas of the ammonia fuel main engine, the flue gas temperature before entering the exhaust gas boiler can be increased, the boiler heat exchange efficiency can be improved, and it can be used as a means to recover the heat energy generated by itself, thereby reducing the overall energy consumption of the treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The present invention is a schematic diagram of the fugitive ammonia treatment principle in a marine combustion-type fugitive ammonia treatment system.

[0033] Figure 2 This is a structural diagram of a mixed burner in a marine combustion-type escaped ammonia treatment system.

[0034] Figure 3 The present invention is a fugitive ammonia treatment workflow diagram in a method for treating marine combustion-type fugitive ammonia. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific examples shown in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0036] Example 1

[0037] A marine combustion-type fugitive ammonia treatment system, comprising a fugitive ammonia collection device 11, an ammonia buffer tank 13, a mixing burner 4, a burner air supply fan 31, a diesel tank 21, a nitrogen storage tank 61, a flue gas mixing chamber 8, an ammonia fuel main engine 7, and an exhaust gas boiler 9;

[0038] The escaped ammonia collection device 11 is connected to the ammonia buffer tank 13 through a pipeline. An ammonia compressor 12 is provided on the pipeline connecting the escaped ammonia collection device 11 and the ammonia buffer tank 13. The ammonia buffer tank 13 is connected to the inlet of the mixed burner 4 through an ammonia supply pipeline. An ammonia shut-off valve 15 is provided on the ammonia supply pipeline. An ammonia pressure control valve 14 is provided on the ammonia supply pipeline near the inlet of the mixed burner 4.

[0039] The diesel tank 21 is connected to the inlet of the mixed burner 4 through a diesel supply pipeline. A burner diesel supply pump 22 is provided on the diesel supply pipeline. A fuel supply valve 23 is provided on the diesel supply pipeline at the inlet of the mixed burner 4. The diesel tank 21 supplies fuel to the mixed burner 4 through the burner diesel supply pump 22.

[0040] The burner air supply fan 31 is connected to the inlet of the mixing burner 4 through an air supply pipeline. The air supply pipelines at the outlet of the burner air supply fan 31 and the inlet of the mixing burner 4 are respectively provided with air supply valves 32. The burner air supply fan 31 supplies combustion air to the mixing burner 4 through the air supply pipeline.

[0041] The outlet of the mixed burner 4 is connected to the flue gas mixing chamber 8 through a flue gas pipeline. An ammonia concentration sensor 51 and a flue gas outlet valve 52 are provided on the flue gas pipeline. The high-temperature flue gas generated in the mixed burner 4 flows into the flue gas mixing chamber 8 through the flue gas pipeline.

[0042] The ammonia fuel main unit 7 is connected to the flue gas mixing chamber 8 through an exhaust pipe, and the combustion exhaust gas of the ammonia fuel main unit 7 enters the flue gas mixing chamber 8 through the exhaust pipe;

[0043] The flue gas mixing chamber 8 is connected to the exhaust gas boiler 9. The combustion exhaust gas of the ammonia fuel main engine 7 and the high-temperature flue gas are mixed in the flue gas mixing chamber 8 and then sent to the exhaust gas boiler 9 as a heat source;

[0044] The nitrogen storage tank 61 is connected to the ammonia supply pipeline, the air supply pipeline and the flue gas pipeline through purge pipelines, and purge valves 62 are respectively provided on the purge pipelines. The fugitive ammonia collection device 11 is connected to the ammonia supply pipeline, the air supply pipeline and the flue gas pipeline through ventilation pipelines, and ventilation valves 10 are respectively provided on the ventilation pipelines. The fugitive ammonia collection device 11 collects fugitive ammonia from the ammonia supply pipeline, the air supply pipeline and the flue gas pipeline.

[0045] The escape ammonia collecting device 11 is also in communication with the main engine and the main engine ammonia fuel supply device to collect the escape ammonia from the main engine and the main engine ammonia fuel supply device.

[0046] Two burner air supply fans 31 are provided in parallel, and the two burner air supply fans 31 serve as backup for each other. The capacity of a single burner air supply fan 31 satisfies the combustion air supply volume of the mixed burner under 4100% load.

[0047] The mixed burner 4 includes a pre-combustion chamber 41 and a main combustion chamber 42. The bottom of the pre-combustion chamber 41 is connected to the diesel supply pipeline. The pre-combustion chamber 41 and the main combustion chamber 42 are respectively connected to the air supply pipeline. The ammonia supply pipeline is connected to the main combustion chamber 42. The ignition oil rain is supplied through the diesel compartment 21. The burner air supply fan 31 provides a part of the pre-combustion air to generate a pre-combustion flame in the pre-combustion chamber 41. Ammonia is sprayed into the main combustion chamber 42 through the ammonia supply pipeline. At the same time, the burner air supply fan 31 provides combustion air to the main combustion chamber 42, and the pre-combustion flame ignites and fully burns to form a main combustion flame, and finally generates high-temperature flue gas.

[0048] Example 2

[0049] A method for treating marine combustion escaped ammonia, the method specifically comprising the following steps:

[0050] S1, the ship control system confirms that the last nitrogen purge procedure is completed and the shut-off valves of each pipeline are in the closed state;

[0051] S2: The control system confirms that the pressure of the ammonia buffer tank 13 is greater than 8 barg, the pressure of the nitrogen storage tank 61 is greater than 10 barg, the low liquid level alarm of the diesel tank 21 is not triggered, and the burner air supply fan 31 and the burner diesel supply pump 22 are in standby mode;

[0052] S3, start the burner air supply fan 31, open the air supply valve 32 near the inlet of the mixing burner 4 and the air supply valve 32 at the outlet of the burner air supply fan 31, and the burner air supply fan 31 supplies air to the mixing burner 4 through the air supply pipeline;

[0053] S4, start the burner diesel supply pump 22, open the fuel supply valve 23 on the diesel supply pipeline to supply diesel to the mixing burner 4, and form a pre-combustion flame in the pre-combustion chamber of the mixing burner 4. At the same time, open the flue gas outlet valve 52;

[0054] S5, after the pre-combustion flame has been started for a certain period of time, the ammonia shut-off valve 15 is opened, and the ammonia pressure is adjusted by the ammonia pressure control valve 14, and then ammonia is sprayed into the main combustion chamber of the mixing burner 4 to form a main combustion flame, and finally generate high-temperature flue gas;

[0055] S6, the ammonia concentration sensor 51 on the flue gas pipeline detects the high-temperature flue gas to determine whether the ammonia concentration in the high-temperature flue gas is higher than 20 PPM;

[0056] S7: When the ammonia concentration of the high-temperature flue gas in the flue gas pipeline is lower than 20 PPM, the pressure in the ammonia buffer tank 13 is detected to be lower than 5 barg. When the pressure in the ammonia buffer tank 13 is lower than 5 barg, the system maintains the running state; when the pressure in the ammonia buffer tank 13 is higher than 5 barg, the flue gas outlet valve 52, the air supply valve 32, the oil supply valve 23 and the ammonia shut-off valve 15 on the air supply pipeline are disconnected;

[0057] S8, when the ammonia concentration of the high-temperature flue gas in the flue gas pipeline is higher than 20 PPM, the flue gas outlet valve 52, the air supply valve 32, the oil supply valve 23 and the ammonia shut-off valve 15 on the air supply pipeline are disconnected;

[0058] S9, after the flue gas outlet valve 52, the air supply valve 32 on the air supply pipeline, the oil supply valve 23, and the ammonia shut-off valve 15 are disconnected, the purge valve 62 on the purge pipeline and the breather valve 10 on the ventilation pipeline are opened, and the nitrogen storage tank 61 blows nitrogen into the ammonia supply pipeline, the air supply pipeline, and the flue gas pipeline through the purge pipeline, and then discharges nitrogen through the ventilation pipeline into the escaped ammonia collection device 11, completing the collection of the escaped ammonia;

[0059] S10, after purging for 600 seconds, the purge valve 62 and the vent valve 10 are closed, and the control system is reset and restored to the standby state.

[0060] 30 seconds after the pre-combustion flame is started, the ammonia shut-off valve 15 is opened and the ammonia pressure control valve 14 adjusts the ammonia pressure to 3 barg.

[0061] The ammonia concentration sensor is installed on the pipeline between the mixing burner and the flue gas mixing chamber to continuously monitor the residual ammonia concentration in the flue gas after combustion. When the ammonia concentration is detected to be above 20ppm, the control system uses this signal to activate the emergency shut-off procedure, stop the system operation and start the purge procedure.

[0062] The high-temperature flue gas from the ammonia-fueled main engine exhaust pipe and the hybrid burner is thoroughly mixed in the flue gas mixing chamber before entering the exhaust gas boiler, where it is used as a heat source to generate steam for onboard steam users. Because the flue gas from the hybrid burner is directly generated without undergoing any work, its flue gas temperature is higher than the exhaust temperature of the ammonia-fueled main engine. This effectively compensates for the lower exhaust temperature of the ammonia-fueled main engine, increases the steam output of the exhaust gas boiler, and simultaneously recycles its own heat energy.

[0063] The glossary of terms appearing in the present invention is explained as follows:

[0064] Escaped ammonia: Ammonia generated by the pipeline purge procedure during the normal operation of the ammonia fuel main engine, as well as naturally generated due to other reasons. It cannot be recycled as liquid ammonia fuel because it is mixed with impurities such as nitrogen or due to system design reasons.

[0065] Fugitive ammonia collection device: A device that filters and performs gas-liquid separation on the fugitive ammonia collected from each node of the system to remove impurities such as oil and solid particles that may affect the subsequent compression and combustion processes.

[0066] Ammonia compressor: A device that increases the pressure of ammonia in the escaped ammonia collection device and then transports it.

[0067] Ammonia buffer tank: A small storage tank used for temporary pressurized storage of ammonia to be processed.

[0068] Mixed burner: a mixed combustion device, its simple working principle is as follows Figure 2 As shown in the figure, diesel is used as the pilot oil, and a part of the combustion air provided by the burner fan generates a pre-combustion flame. Then ammonia and the remaining combustion air are further sprayed into the combustion chamber, ignited by the pre-combustion flame, and fully burned, finally generating high-temperature flue gas.

[0069] Flue gas mixing chamber: A flue gas mixing device that evenly mixes the high-temperature flue gas generated by the burner with the exhaust gas of the ammonia fuel host.

[0070] Ammonia concentration sensor: A sensor that uses spectral analysis to continuously monitor the residual ammonia concentration in the flue gas and outputs signals to the control system.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present invention. They should all be included in the scope of the technical solutions for which protection is sought in the present invention.

Claims

1. A marine combustion-type escaped ammonia treatment system, characterized in that: The system includes a fugitive ammonia collection device, an ammonia buffer tank, a mixing burner, a burner air supply fan, a diesel tank, a nitrogen storage tank, a flue gas mixing chamber, an ammonia fuel main engine and an exhaust gas boiler; The escaped ammonia collection device is connected to the ammonia cache tank through a pipeline, and an ammonia compressor is provided on the pipeline connecting the escaped ammonia collection device and the ammonia cache tank. The ammonia cache tank is connected to the mixed burner inlet through an ammonia supply pipeline, and an ammonia shut-off valve is provided on the ammonia supply pipeline. An ammonia pressure control valve is provided on the ammonia supply pipeline near the mixed burner inlet; The diesel tank is connected to the mixed burner inlet through a diesel supply pipeline, a burner diesel supply pump is provided on the diesel supply pipeline, and an oil supply valve is provided on the diesel supply pipeline at the mixed burner inlet. The diesel tank supplies oil to the mixed burner through the burner diesel supply pump; The burner air supply fan is connected to the mixed burner inlet through an air supply pipeline. The air supply pipelines at the burner air supply fan outlet and the mixed burner inlet are respectively provided with air supply valves. The burner air supply fan supplies combustion air to the mixed burner through the air supply pipeline. The outlet of the mixed burner is connected to the flue gas mixing chamber through a flue gas pipeline. An ammonia concentration sensor and a flue gas outlet valve are provided on the flue gas pipeline. The high-temperature flue gas generated in the mixed burner flows into the flue gas mixing chamber through the flue gas pipeline. The ammonia fuel main engine is connected to the flue gas mixing chamber through an exhaust pipe, and the combustion exhaust gas of the ammonia fuel main engine enters the flue gas mixing chamber through the exhaust pipe; The flue gas mixing chamber is connected to the exhaust gas boiler. The combustion exhaust gas of the ammonia fuel main engine and the high-temperature flue gas are mixed in the flue gas mixing chamber and then sent to the exhaust gas boiler heat source; The nitrogen storage tank is connected to the ammonia supply pipeline, air supply pipeline and flue gas pipeline through purge pipelines, and purge valves are respectively provided on the purge pipelines. The fugitive ammonia collection device is connected to the ammonia supply pipeline, air supply pipeline and flue gas pipeline through ventilation pipelines, and ventilation valves are respectively provided on the ventilation pipelines. The fugitive ammonia collection device collects fugitive ammonia from the ammonia supply pipeline, air supply pipeline and flue gas pipeline.

2. A marine combustion-type escaped ammonia treatment system according to claim 1, characterized in that: The escape ammonia collection device is also in communication with the main engine and the main engine ammonia fuel supply device, and collects the escape ammonia from the main engine and the main engine ammonia fuel supply device.

3. A marine combustion-type escaped ammonia treatment system according to claim 1, characterized in that: Two burner air supply fans are arranged in parallel, and the two burner air supply fans serve as backup for each other. The capacity of a single burner air supply fan meets the combustion air supply volume of the mixed burner under 100% load.

4. A marine combustion-type escaped ammonia treatment system according to claim 1, characterized in that: The mixed burner includes a pre-combustion chamber and a main combustion chamber. The bottom of the pre-combustion chamber is connected to the diesel supply pipeline. The pre-combustion chamber and the main combustion chamber are respectively connected to the air supply pipeline. The ammonia supply pipeline is connected to the main combustion chamber. The ignition oil rain is supplied through the diesel tank. The burner air supply fan provides a part of the pre-combustion air to generate a pre-combustion flame in the pre-combustion chamber. Ammonia is sprayed into the main combustion chamber through the ammonia supply pipeline. At the same time, the burner air supply fan provides combustion air to the main combustion chamber, and the pre-combustion flame ignites and fully burns to form a main combustion flame, and finally generates high-temperature flue gas.

5. A method for treating ammonia escaped from combustion in a ship, using a system for treating ammonia escaped from combustion in a ship according to any one of claims 1 to 4, characterized in that: The method specifically comprises the following steps: S1, the ship control system confirms that the last nitrogen purge procedure is completed and the shut-off valves of each pipeline are in the closed state; S2, the control system confirms that the ammonia buffer tank pressure is greater than 8 barg, the nitrogen storage tank pressure is greater than 10 barg, the diesel tank low level alarm is not triggered, and the burner air supply fan and burner diesel supply pump are in standby mode; S3, start the burner air supply fan, open the air supply valve near the mixed burner inlet and the air supply valve at the burner air supply fan outlet, and the burner air supply fan supplies air to the mixed burner through the air supply pipeline; S4, start the burner diesel supply pump, open the fuel supply valve on the diesel supply pipeline to supply diesel to the mixing burner, form a pre-combustion flame in the pre-combustion chamber of the mixing burner, and open the flue gas outlet valve at the same time; S5, after the pre-combustion flame starts for a certain period of time, the ammonia shut-off valve is opened, and the ammonia pressure is adjusted by the ammonia pressure control valve, and then ammonia is sprayed into the main combustion chamber of the mixed burner to form a main combustion flame, and finally generate high-temperature flue gas; S6, the ammonia concentration sensor on the flue gas pipeline detects the high-temperature flue gas to determine whether the ammonia concentration in the high-temperature flue gas is higher than 20PPM; S7: When the ammonia concentration of the high-temperature flue gas in the flue gas pipeline is lower than 20 PPM, the pressure in the ammonia buffer tank is detected to be lower than 5 barg. When the pressure in the ammonia buffer tank is lower than 5 barg, the system maintains the running state; when the pressure in the ammonia buffer tank is higher than 5 barg, the flue gas outlet valve, the air supply valve, the oil supply valve and the ammonia shut-off valve on the air supply pipeline are disconnected; S8, when the ammonia concentration of the high-temperature flue gas in the flue gas pipeline is higher than 20 PPM, disconnect the flue gas outlet valve, the air supply valve, the oil supply valve and the ammonia shut-off valve on the air supply pipeline; S9, after the flue gas outlet valve, the air supply valve, the oil supply valve, and the ammonia shut-off valve on the air supply pipeline are disconnected, the purge valve on the purge pipeline and the vent valve on the vent pipeline are opened, and nitrogen is blown from the nitrogen storage tank into the ammonia supply pipeline, the air supply pipeline, and the flue gas pipeline through the purge pipeline, and then discharged into the escaped ammonia collection device through the vent pipeline, completing the collection of the escaped ammonia; S10, after purging for 600 seconds, close the purge valve and the vent valve, reset the control system, and return to the standby state.

6. The method for treating ammonia escape from marine combustion according to claim 5, characterized in that: 30 seconds after the pre-combustion flame is started, the ammonia shut-off valve is opened and the ammonia pressure control valve adjusts the ammonia pressure to 3 barg.

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