Water-cooled marine natural gas incineration device

Abstract

The embodiment of the invention provides a water-cooled natural gas incineration device for a ship. And the flue gas is cooled by combining an air cooling mode and a water cooling mode, so that the aim of quickly cooling the flue gas is fulfilled. A combustor installed on the top is adopted for combusting boil-off gas, combustion air and cooling air are supplied through a draught fan, flue gas generated after the boil-off gas is combusted is subjected to primary cooling, then a combustion chamber and the flue gas are subjected to secondary cooling through a water cooling wall, the cooled flue gas enters a chilling chamber from the lower portion, and the flue gas is subjected to tertiary cooling through a water pool at the bottom of the chilling chamber. And the flue gas is cooled by spraying water in the chilling chamber for four times, and then is discharged from a chimney. The water cooling wall, the chilling chamber and the spray cooling structure are additionally arranged, the water cooling wall is used for cooling and protecting the wall face of the combustion chamber, the chilling chamber and the spray cooling structure are used for spray cooling of flue gas, water cooling and air cooling are combined to conduct multi-stage cooling on the flue gas, and therefore the cooling efficiency of the natural gas incineration device is improved; and the exhaust gas temperature of the natural gas incineration device is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of environmental protection equipment, and in particular to a water-cooled marine natural gas incineration device. Background Art

[0002] In recent years, with the increase in fuel prices, ship power has shifted from fuel oil to gas, and liquefied natural gas (LNG) will be the most ideal alternative fuel to fuel oil. However, in the process of ship fuel conversion, the problem of LNG refueling has become increasingly prominent. Whether it is through LNG tank trucks, LNG container tanks or LNG refueling stations, ships need to travel to docks with corresponding refueling facilities for refueling, which affects the ship's sailing route and cycle.

[0003] Therefore, the ship-to-ship bunkering method came into being. This bunkering method has a high bunkering rate, does not require docking at ports or docks, can be bunkered at any time and place according to customer needs, and is also safer. In 2013, the world's first LNG bunkering ship was born in Norway, and LNG bunkering ships have gradually emerged since then.

[0004] During the voyage and refueling process of the LNG bunkering ship, LNG will absorb heat and gasify to form a large amount of boil-off gas (BOG), which needs to be discharged safely to avoid the increase of LNG cargo tank pressure of the bunkering ship and the receiving ship. Currently, it is mainly treated and discharged by burning through marine natural gas incineration devices.

[0005] According to IMO specifications, when the natural gas incineration device of an LNG bunkering ship processes exhaust gas, the exhaust temperature of the flue gas cannot exceed 250°C. The current existing natural gas incineration device technology is mainly used in LNG carriers, and the required exhaust temperature is not more than 535°C. The existing technology usually uses fans to supply cooling air to cool the flue gas, but if you want to reduce the flue gas temperature to below 250°C, you need to configure a larger cooling fan and provide mixing space. However, since the size of the natural gas incineration device is limited by the ship space, it is impossible to quickly reduce the technical indicator to below 250°C by supplying a large amount of cooling air. Summary of the invention

[0006] The present invention provides a marine natural gas incineration device, which combines air cooling and water cooling to cool the flue gas, and achieves the goal of rapidly cooling the flue gas to below 250°C. The present invention uses a top-mounted burner to burn the evaporation gas, and supplies combustion air and cooling air through a fan to cool the flue gas after the evaporation gas is burned. Then, the combustion chamber and the flue gas are cooled twice through a water-cooled wall. The cooled flue gas enters a quenching chamber from below, and the water pool at the bottom of the quenching chamber cools the flue gas three times. The flue gas is sprayed with water in the quenching chamber for a fourth cooling, and the flue gas is cooled to below 250°C, and then discharged from the chimney.

[0007] The present invention adds a water-cooled wall, a quenching chamber, and a spray cooling structure. The water-cooled wall is used for cooling and protecting the combustion chamber wall surface, the quenching chamber and the spray cooling structure are used for spray cooling of the flue gas. Water cooling and air cooling are combined to perform multi-stage cooling of the flue gas, thereby improving the cooling efficiency of the natural gas incineration device, reducing the exhaust temperature of the natural gas incineration device, and solving the problem that the current product cannot be applied to LNG bunkering ships due to insufficient cooling effect.

[0008] The embodiment of the present invention provides a water-cooled marine natural gas incineration device, which includes the following components:

[0009] Dual fuel burners are used to burn fuel oil or flash gas BOG alone, or both fuel oil and BOG, and the combustion is carried out in the combustion chamber;

[0010] Wind box and air inlet, used to input combustion air and cooling air;

[0011] The water-cooled wall cooling water inlet is used to connect the seawater delivery pump pipeline to provide cooling water for the water-cooled wall;

[0012] The combustion chamber is used to mix fuel oil / BOG and combustion air and burn them to generate high-temperature flue gas. The high-temperature flue gas is mixed with cooling air in the combustion chamber for primary cooling to reduce the temperature of the high-temperature flue gas. The bottom of the combustion chamber is connected to the quenching chamber, and the flue gas is passed into the water pool at the bottom of the quenching chamber for tertiary cooling;

[0013] The water-cooled wall is connected to the inner wall of the combustion chamber. Seawater is introduced into the water-cooled wall as a cooling medium. The water-cooled wall exchanges heat with the inner wall of the combustion chamber to reduce the wall temperature of the combustion chamber and play a protective role, and also reduce the flue gas temperature. The bottom of the water-cooled wall is the cooling water outlet, which is connected to the water pool at the bottom of the quenching chamber.

[0014] The cooling water spray inlet is used to connect the seawater delivery pump pipeline to provide cooling water for the cooling water spray distribution ring;

[0015] The cooling water spray distribution ring has a cooling water atomizing nozzle interface at the bottom, which is arranged in the quenching chamber to spray the flue gas;

[0016] The cooling water atomizing nozzle is installed in the cooling water spray distribution ring. After the nozzle atomizes the cooling water, it sprays downward on the flue gas to cool the flue gas;

[0017] Liquid level detection port, used to connect the liquid level detector to detect the liquid level of the water pool at the bottom of the quenching chamber;

[0018] Bubble breaker a, located at the upper part of the quenching chamber water pool, is used to break large bubbles to avoid significant oscillation in the quenching chamber water pool due to large bubbles;

[0019] Bubble breaker b, located at the bottom of the quenching chamber water pool, is used to break large bubbles to avoid significant oscillation in the quenching chamber water pool due to large bubbles;

[0020] The drain pipe is used for drainage and sewage discharge. A pneumatic valve is installed on the pipe. When the liquid level is higher than the preset liquid level threshold, the pneumatic valve will automatically open to drain water. When maintenance and cleaning are required, the liquid in the quenching chamber can be discharged through the drain pipe;

[0021] The pneumatic valve is used to control whether the sewage pipe is discharged. The liquid level detector and the pneumatic valve will form a linkage;

[0022] Overflow pipe: The overflow pipe is used to control the liquid level. A drain valve is installed on the overflow pipe. When the liquid level exceeds the overflow pipe, the cooling water will flow out through the overflow pipe and enter the ship's drainage system.

[0023] Steam trap, the steam trap is used to prevent the flue gas from being discharged through the overflow pipe, and the steam trap only allows liquid to pass;

[0024] The quenching chamber has a pool formed by seawater at the bottom, multiple sprinklers in the middle, and a flue gas outlet at the top. The height of the pool is controlled by an overflow pipe and a liquid level detector. The bottom of the pool is a sewage pipe. The quenching chamber is connected to the bottom of the combustion chamber. The flue gas leaves the combustion chamber and enters the pool. It is transformed into a large number of small bubbles by the bubble breaker and then enters the quenching chamber channel. The flue gas flows through the quenching chamber to the flue gas outlet and is finally discharged. During the flow of the flue gas in the quenching chamber, it will be cooled by the cooling water spray in the quenching chamber.

[0025] The smoke outlet is used to connect to the chimney to discharge the smoke. The smoke outlet is provided with a temperature detection port to detect and control the temperature of the smoke at the outlet;

[0026] The temperature detection port is used to connect the temperature transmitter. The temperature transmitter detects the flue gas temperature and feeds back the flue gas temperature to the control system. By adjusting the air supply and cooling water supply, the flue gas temperature is ensured to be lower than the preset temperature threshold.

[0027] In some embodiments, after the flash gas BOG is mixed with air for combustion, the device uses excess air to perform primary cooling on the flue gas, and then performs secondary cooling on the flue gas through a water-cooled wall;

[0028] The flue gas is then discharged from below into the quenching chamber. There is cooling water at the bottom of the quenching chamber, and the cooling water level is higher than the flue gas outlet of the combustion chamber. The flue gas is cooled three times by the cooling water pool. When the flue gas passes through the quenching chamber, the cooling water is atomized by the cooling water atomizing nozzle to spray the flue gas, thereby achieving four-time cooling of the flue gas, and finally discharged into the atmosphere through the chimney connected to the flue gas outlet.

[0029] In some embodiments, the cooling water spray distribution ring is an annular ring.

[0030] In some embodiments, the number of the cooling water spray distribution rings ranges from 2 to 5, which are arranged at different heights in the quenching chamber.

[0031] In some embodiments, the number of the cooling water atomizing nozzles ranges from 16 to 48, which are evenly distributed along the circumference of the cooling water spray distribution ring.

[0032] In some embodiments, the preset temperature threshold comprises 250°C.

[0033] In some embodiments, the method for inputting combustion air and cooling air includes:

[0034] It is used to connect the fan air supply channel to input the fan air supply into the combustion chamber as combustion air and cooling air.

[0035] In some embodiments, the liquid level detection port is used to connect a liquid level detector to detect the liquid level of the water pool at the bottom of the quenching chamber, including:

[0036] Under normal circumstances, the water level in the water pool will not rise due to the overflow pipe. If an abnormal liquid level is detected, it means that the overflow pipe is blocked, and the pneumatic valve on the drain pipe will be controlled to open to prevent the liquid level from being too high and causing excessive pressure in the combustion chamber.

[0037] An embodiment of the present invention provides an LNG ship liquid cargo system, comprising a water-cooled marine natural gas incineration device as described in any of the above embodiments.

[0038] An embodiment of the present invention provides a ship, comprising a water-cooled marine natural gas incineration device as described in any of the above embodiments.

[0039] Compared with the prior art, the beneficial effects of the above embodiments of the present invention include:

[0040] 1) Use seawater spray to treat flue gas and increase the cooling rate;

[0041] 2) Water cooling can make up for the deficiency of air cooling, greatly reduce the required air supply, reduce the amount of flue gas, and reduce the size of equipment;

[0042] 3) The combustion chamber is protected by a water-cooled wall, the refractory brick structure is eliminated, and the weight of the equipment is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings illustrate generally, by way of example and not limitation, various embodiments discussed herein.

[0044] Figure 1 This is a schematic structural diagram of a water-cooled marine natural gas incineration device according to an embodiment of the present invention;

[0045] Figure 2 This is a medium flow diagram of a water-cooled marine natural gas incineration device according to an embodiment of the present invention;

[0046] Figure 3 It is a three-dimensional schematic diagram of a water-cooled marine natural gas incineration device according to an embodiment of the present invention.

[0047] Explanation of symbols:

[0048] 1-dual fuel burner; 2-wind box and air inlet; 3-water wall cooling water inlet; 4-combustion chamber; 5-water wall; 6-cooling water spray inlet; 7-cooling water spray distribution ring; 8-cooling water atomizing nozzle; 9-liquid level detection port; 10-bubble breaker a; 11-bubble breaker b; 12-drain pipe; 13-pneumatic valve; 14-overflow pipe; 15-drain valve; 16-quenching chamber; 17-smoke outlet; 18-temperature detection port. DETAILED DESCRIPTION

[0049] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present application, the implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application.

[0050] In the embodiments of the present application, it should be noted that, unless otherwise specified and limited, the term "connection" should be understood in a broad sense. For example, it can be an electrical connection or a connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0051] It should be noted that the terms "first\second\third" involved in the embodiments of the present application are only used to distinguish similar objects, and do not represent a specific order for the objects. It is understandable that the "first\second\third" can be interchanged with a specific order or sequence where permitted. It should be understood that the objects distinguished by "first\second\third" can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0052] like Figure 1-3 Shown are the medium flow diagram, device general diagram and three-dimensional schematic diagram of the water-cooled marine natural gas incineration device.

[0053] Combine the following Figures 1 to 3 The water-cooled marine natural gas combustion device according to the embodiment of the present invention is specifically described. The embodiment of the present invention provides a water-cooled marine natural gas combustion device, such as Figure 1 As shown, it includes a dual-fuel burner 1, a wind box and air inlet 2, a water-cooled wall cooling water inlet 3, a combustion chamber 4, a water-cooled wall 5, a cooling water spray inlet 6, a cooling water spray distribution ring 7, a cooling water atomizing nozzle 8, a liquid level detection port 9, a bubble breaker a10, a bubble breaker b11, a drain pipe 12, a pneumatic valve 13, an overflow pipe 14, a drain valve 15, a quenching chamber 16, a flue gas outlet 17 and a temperature detection port 18. After BOG is mixed with air and burned, the flue gas is cooled once by the excess air, and then the flue gas is cooled twice by the water-cooled wall. The flue gas is then discharged from the bottom to the quenching chamber. The bottom of the quenching chamber is cooling water, and the cooling water level is higher than the flue gas outlet of the combustion chamber. The flue gas is cooled three times by the cooling water pool. When the flue gas passes through the quenching chamber, the cooling water is sprayed by the nozzle to achieve four times of cooling of the flue gas, and finally discharged to the atmosphere through the chimney connected to the exhaust outlet.

[0054] The dual-fuel burner 1 is a burner that can burn fuel oil or flash gas (Boil Off Gas, BOG) alone, or burn fuel oil and BOG simultaneously, and is used to transport fuel oil and BOG for combustion in a combustion chamber.

[0055] The bellows and air inlet 2 are used to connect to the air supply channel of the fan to input the air supplied by the fan into the combustion chamber as combustion air and cooling air.

[0056] The water-cooled wall cooling water inlet 3 is used to connect the seawater delivery pump pipeline to provide cooling water for the water-cooled wall.

[0057] The combustion chamber 4 is used to mix fuel oil / BOG and combustion air and burn them to generate high-temperature flue gas. The high-temperature flue gas is mixed with cooling air in the combustion chamber for primary cooling to reduce the temperature of the high-temperature flue gas. The high-temperature flue gas exchanges heat with the water-cooled wall during the flow in the combustion chamber, and then undergoes secondary cooling to further reduce the temperature of the flue gas. The bottom of the combustion chamber is connected to the quenching chamber, and the flue gas is passed into the water pool at the bottom of the quenching chamber for tertiary cooling.

[0058] The water-cooled wall 5 is connected to the inner wall of the combustion chamber. Seawater is introduced into the water-cooled wall as a cooling medium. The water-cooled wall exchanges heat with the inner wall of the combustion chamber, reduces the wall temperature of the combustion chamber, plays a protective role, and reduces the flue gas temperature. The bottom of the water-cooled wall is a cooling water outlet, which is connected to the water pool at the bottom of the quenching chamber.

[0059] The cooling water spray inlet 6 is used to connect the seawater delivery pump pipeline to provide cooling water for the cooling water spray distribution ring.

[0060] The cooling water spray distribution ring 7 is an annular circular tube, and cooling water atomizing nozzle interfaces are evenly arranged along the circumference of the lower part of the circular tube. According to process requirements, three cooling water spray distribution rings are arranged at different heights in the quenching chamber to spray the flue gas.

[0061] The cooling water atomizing nozzles 8 are installed on the cooling water spray distribution ring, and 16 of them are evenly distributed along the circumference. After the nozzles atomize the cooling water, they spray downward on the flue gas to cool the flue gas.

[0062] The liquid level detection port 9 is used to connect the liquid level detector to detect the liquid level of the water pool at the bottom of the quenching chamber. Under normal circumstances, the liquid level of the water pool will not rise due to the overflow pipe. If an abnormal liquid level is detected, it means that the overflow pipe is blocked, and the pneumatic valve on the drain pipe will be controlled to open to avoid excessive pressure in the combustion chamber due to excessive liquid level.

[0063] The bubble breaker a10 is located at the upper part of the water pool in the quenching chamber and is used to break large bubbles to avoid significant oscillation in the water pool in the quenching chamber due to large bubbles.

[0064] The bubble breaker b11 is located at the lower part of the quenching chamber water pool and is used to break large bubbles to avoid significant oscillation in the quenching chamber water pool due to large bubbles.

[0065] The drain pipe 12 is used for draining water and sewage. A pneumatic valve is arranged on the pipe. When the liquid level is too high, the pneumatic valve will be opened automatically to drain water. When maintenance and cleaning are required, the liquid in the quenching chamber can be discharged through the drain pipe.

[0066] The pneumatic valve 13 is used to control whether the sewage pipe is discharged, and the liquid level detector and the pneumatic valve will form a linkage.

[0067] Overflow pipe 14, the overflow pipe is used to control the liquid level height, and a drain valve is arranged on the overflow pipe. When the liquid level exceeds the overflow pipe, the cooling water will flow out through the overflow pipe and enter the ship's drainage system.

[0068] Steam trap 15, the steam trap is used to prevent smoke from being discharged through the overflow pipe, and the steam trap only allows liquid to pass through.

[0069] The quenching chamber 16 has a pool formed by seawater at the bottom, a plurality of sprinklers in the middle, and a flue gas outlet connected to the top. The height of the pool is controlled by an overflow pipe and a liquid level detector, and the bottom of the pool is a sewage pipe. The quenching chamber is connected to the bottom of the combustion chamber. The flue gas leaves the combustion chamber and enters the pool. After being transformed into a large number of small bubbles by the bubble breaker, it enters the quenching chamber channel. The flue gas flows through the quenching chamber to the flue gas outlet and is finally discharged. During the flow of the flue gas in the quenching chamber, it will be cooled by the cooling water spray in the quenching chamber.

[0070] The smoke outlet 17 is used to connect to the chimney to discharge the smoke. The smoke outlet is provided with a temperature detection port to detect and control the temperature of the outlet smoke.

[0071] The temperature detection port 18 is used to connect a temperature transmitter, which detects the flue gas temperature and feeds back the flue gas temperature to the control system, and ensures that the flue gas temperature is lower than a preset temperature threshold by adjusting the air supply and cooling water supply. Here, the preset temperature threshold may include 250°C.

[0072] An embodiment of the present invention provides an LNG ship liquid cargo system, comprising a water-cooled marine natural gas incineration device as described in any of the above embodiments.

[0073] An embodiment of the present invention provides a ship, comprising a water-cooled marine natural gas incineration device as described in any of the above embodiments.

[0074] The technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0075] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A water-cooled marine natural gas incineration device, characterized in that: The device comprises the following components: Dual fuel burners are used to burn fuel oil or flash gas BOG alone, or both fuel oil and BOG, and the combustion is carried out in the combustion chamber; Wind box and air inlet, used to input combustion air and cooling air; The water-cooled wall cooling water inlet is used to connect the seawater delivery pump pipeline to provide cooling water for the water-cooled wall; The combustion chamber is used to mix fuel oil / BOG and combustion air and burn them to generate high-temperature flue gas. The high-temperature flue gas is mixed with cooling air in the combustion chamber for primary cooling to reduce the temperature of the high-temperature flue gas. The bottom of the combustion chamber is connected to the quenching chamber, and the flue gas is passed into the water pool at the bottom of the quenching chamber for tertiary cooling; The water-cooled wall is connected to the inner wall of the combustion chamber. Seawater is introduced into the water-cooled wall as a cooling medium. The water-cooled wall exchanges heat with the inner wall of the combustion chamber to reduce the wall temperature of the combustion chamber and play a protective role, and also reduce the flue gas temperature. The bottom of the water-cooled wall is the cooling water outlet, which is connected to the water pool at the bottom of the quenching chamber. The cooling water spray inlet is used to connect the seawater delivery pump pipeline to provide cooling water for the cooling water spray distribution ring; The cooling water spray distribution ring has a cooling water atomizing nozzle interface at the bottom, which is arranged in the quenching chamber to spray the flue gas; The cooling water atomizing nozzle is installed in the cooling water spray distribution ring. After the nozzle atomizes the cooling water, it sprays downward on the flue gas to cool the flue gas; Liquid level detection port, used to connect the liquid level detector to detect the liquid level of the water pool at the bottom of the quenching chamber; Bubble breaker a, located at the upper part of the quenching chamber water pool, is used to break large bubbles to avoid significant oscillation in the quenching chamber water pool due to large bubbles; Bubble breaker b, located at the bottom of the quenching chamber water pool, is used to break large bubbles to avoid significant oscillation in the quenching chamber water pool due to large bubbles; The drain pipe is used for drainage and sewage discharge. A pneumatic valve is installed on the pipe. When the liquid level is higher than the preset liquid level threshold, the pneumatic valve will automatically open to drain water. When maintenance and cleaning are required, the liquid in the quenching chamber can be discharged through the drain pipe; The pneumatic valve is used to control whether the sewage pipe is discharged. The liquid level detector and the pneumatic valve will form a linkage; Overflow pipe: The overflow pipe is used to control the liquid level. A drain valve is installed on the overflow pipe. When the liquid level exceeds the overflow pipe, the cooling water will flow out through the overflow pipe and enter the ship's drainage system. Steam trap, the steam trap is used to prevent the flue gas from being discharged through the overflow pipe, and the steam trap only allows liquid to pass; The quenching chamber has a pool formed by seawater at the bottom, multiple sprinklers in the middle, and a flue gas outlet at the top. The height of the pool is controlled by an overflow pipe and a liquid level detector. The bottom of the pool is a sewage pipe. The quenching chamber is connected to the bottom of the combustion chamber. The flue gas leaves the combustion chamber and enters the pool. It is transformed into a large number of small bubbles by the bubble breaker and then enters the quenching chamber channel. The flue gas flows through the quenching chamber to the flue gas outlet and is finally discharged. During the flow of the flue gas in the quenching chamber, it will be cooled by the cooling water spray in the quenching chamber. The smoke outlet is used to connect to the chimney to discharge the smoke. The smoke outlet is provided with a temperature detection port to detect and control the temperature of the smoke at the outlet; The temperature detection port is used to connect the temperature transmitter. The temperature transmitter detects the flue gas temperature and feeds back the flue gas temperature to the control system. It ensures that the flue gas temperature is lower than the preset temperature threshold by adjusting the air supply and cooling water supply.

2. The water-cooled marine natural gas incineration device according to claim 1, characterized in that: After the flash gas BOG is mixed with air and burned, the device uses the excess air to cool the flue gas once, and then uses the water-cooled wall to cool the flue gas twice; The flue gas is then discharged from below into the quenching chamber. There is cooling water at the bottom of the quenching chamber, and the cooling water level is higher than the flue gas outlet of the combustion chamber. The flue gas is cooled three times by the cooling water pool. When the flue gas passes through the quenching chamber, the cooling water is atomized by the cooling water atomizing nozzle to spray the flue gas, thereby achieving four-time cooling of the flue gas, and finally discharged into the atmosphere through the chimney connected to the flue gas outlet.

3. The water-cooled marine natural gas incineration device according to claim 1, characterized in that: The cooling water spray distribution ring is an annular ring.

4. The water-cooled marine natural gas incineration device according to claim 3, characterized in that: The number of the cooling water spray distribution rings ranges from 2 to 5, which are arranged at different heights in the quenching chamber.

5. The water-cooled marine natural gas incineration device according to claim 3, characterized in that: The number of the cooling water atomizing nozzles ranges from 16 to 48, and they are evenly distributed along the circumference and installed on the cooling water spray distribution ring.

6. The water-cooled marine natural gas incineration device according to claim 1, characterized in that: The preset temperature threshold includes 250°C.

7. The water-cooled marine natural gas incineration device according to claim 1, characterized in that: The device for inputting combustion air and cooling air comprises: It is used to connect the fan air supply channel to input the fan air supply into the combustion chamber as combustion air and cooling air.

8. The water-cooled marine natural gas incineration device according to claim 1, characterized in that: The liquid level detection port is used to connect a liquid level detector to detect the liquid level of the water pool at the bottom of the quenching chamber, including: Under normal circumstances, the water level in the water pool will not rise due to the overflow pipe. If an abnormal liquid level is detected, it means that the overflow pipe is blocked, and the pneumatic valve on the drain pipe will be controlled to open to prevent the liquid level from being too high and causing excessive pressure in the combustion chamber.

9. An LNG carrier liquid cargo system, characterized in that: It comprises the water-cooled marine natural gas incineration device as described in claims 1 to 8.

10. A ship, characterized in that: It comprises the water-cooled marine natural gas incineration device as described in claims 1 to 8.

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