Ship liquid cargo tank boil-off gas combustion device

Abstract

The invention provides a boil-off gas combustion device for a ship liquid cargo tank. One end of the collecting assembly is connected to the top of the liquid cargo tank, and the other end of the collecting assembly is connected with the gas collecting tank; the gas valve group comprises a gas conveying main pipeline and a gas conveying auxiliary pipeline, and the gas conveying main pipeline and the gas conveying auxiliary pipeline are both used for conveying gas; the combustion-supporting mixing chamber, the gas transmission main pipeline and the gas transmission auxiliary pipeline are connected with the combustion-supporting mixing chamber, and gas inlets of the gas transmission main pipeline and the gas transmission auxiliary pipeline are connected to the gas collecting tank in parallel; the air blowing assembly is connected with the combustion-supporting mixing chamber so that air can enter the combustion-supporting mixing chamber to be mixed with the fuel gas; and the combustion assembly communicates with the combustion-supporting mixing chamber and is used for igniting the mixed gas for combustion. The device can achieve the purposes of actively controlling liquefied natural gas, stabilizing cabin pressure and reducing greenhouse gas emission.

Description

Technical Field

[0001] The present invention relates to the field of liquefied natural gas boil-off gas treatment, and particularly to a combustion device for the evaporation gas of a ship's liquid cargo tank. Background Art

[0002] During the transportation of liquefied natural gas, due to the change of temperature and pressure, part of the natural gas no longer remains in a liquid state but becomes gaseous. This phenomenon is called "boil off gas", abbreviated as BOG. With the continuous generation of gasification gas, if it accumulates continuously, it will cause the pressure in the liquid cargo tank to rise and lead to safety accidents. In this context, regarding how to eliminate the adverse effects brought by the excess gasification gas, there have been relevant studies. For example, a breather mast for reducing the tank pressure is set. When the gas at the top of the liquid cargo tank accumulates to form a certain pressure, the excess gas is led out of the liquid cargo tank and discharged into the air to keep the tank pressure stable. This method is a passive treatment of gas and cannot achieve long-term stable control. Summary of the Invention

[0003] In view of the above-mentioned disadvantages of the related technologies, the purpose of the present invention is to provide a combustion device for the evaporation gas of a ship's liquid cargo tank.

[0004] To achieve the above purpose and other related purposes, the present invention provides a combustion device for the evaporation gas of a ship's liquid cargo tank, including: a gas collecting tank; a collecting assembly, one end of which is configured to be connected to the top of the liquid cargo tank for collecting the excess evaporated gas, and the other end of the collecting assembly is connected to the gas collecting tank; a gas valve group, including a main gas pipeline and an auxiliary gas pipeline, both the main gas pipeline and the auxiliary gas pipeline are used for transporting gas, and the inlets of the main gas pipeline and the auxiliary gas pipeline are connected in parallel to the gas collecting tank; a combustion-supporting mixing chamber, both the main gas pipeline and the auxiliary gas pipeline are connected to the combustion-supporting mixing chamber; a blowing assembly, connected to the combustion-supporting mixing chamber to allow air to enter the combustion-supporting mixing chamber and mix with the gas; a combustion assembly, communicating with the combustion-supporting mixing chamber, and the combustion assembly is used to ignite the mixed gas for combustion; wherein, a small amount of gas is introduced into the combustion-supporting mixing chamber through the auxiliary gas pipeline, and at the same time, a small amount of air is sent into the combustion-supporting mixing chamber by the blowing assembly for mixing. After the combustion assembly pre-ignites and ignites the mixed gas, the main gas pipeline and the blowing assembly introduce gas and air into the combustion-supporting mixing chamber in proportion for mixing, and the combustion assembly conducts main ignition to ignite the mixed gas.

[0005] Optionally, the gas valve group includes a conveying valve, a main gas valve, and a quick-closing valve. The conveying valve, the main gas valve, and the quick-closing valve are sequentially connected in series through a gas pipe to form the main gas pipeline. The outlet of the quick-closing valve is connected to the combustion-supporting mixing chamber through a gas pipe. The main gas valve is used to control and regulate the transportation of gas, and the quick-closing valve is used to cut off the gas transportation emergently.

[0006] Optionally, the gas valve group further includes a purge valve and a breather valve. The purge valve and the breather valve are respectively connected to the pipeline between the quick-closing valve and the combustion-supporting mixing chamber through gas pipes, and the breather valve is located between the quick-closing valve and the purge valve. The purge valve is used to open during purging to convey purge gas, and the breather valve is used to open during purging to discharge gas.

[0007] Optionally, the gas valve group further includes a delivery valve and a main gas valve. The auxiliary gas pipeline is composed of the delivery valve and the main gas valve. The intake port of the delivery valve on the auxiliary gas pipeline is in parallel connection with the intake port of the delivery valve on the main gas pipeline to the gas collecting tank. The outlet port of the main gas valve on the auxiliary gas pipeline is connected to the pipeline between the quick-closing valve and the combustion assembly on the main gas pipeline.

[0008] Optionally, the combustion assembly includes a combustion chamber, an ignition component, and a photosensor. The combustion chamber is in communication with the combustion-supporting mixing chamber. The ignition component is arranged in the combustion chamber and is used for pre-ignition and main ignition. The photosensor is arranged in the combustion chamber and is used to detect whether the ignition is successful.

[0009] Optionally, the combustion assembly further includes a fixing component. The fixing component includes a support frame, a cylinder, and a connecting web. The support frame is fixed to the top of the combustion chamber. One end of the cylinder is fixed to the support frame, and the other end of the cylinder is connected to the connecting web. The connecting web is configured to be fixed to the enclosure structure.

[0010] Optionally, the combustion assembly further includes a fine-tuning component. The fine-tuning component includes a limiting frame, a movable rod, and a fire baffle. There are multiple limiting frames, and the multiple limiting frames are evenly arranged on the top of the combustion chamber. Each limiting frame is slidably inserted with a movable rod. There are gaps between the horizontal two sides of the movable rod and the limiting frame. The end of each movable rod away from the corresponding limiting frame is connected to the fire baffle. The fire baffle is located in the combustion chamber and is used to adjust the position of the flame.

[0011] Optionally, the evaporation gas combustion device for a ship's liquid cargo tank further includes an exhaust component. The exhaust component includes an exhaust chamber, and the exhaust chamber is in communication with the combustion assembly and is used to discharge waste gas.

[0012] Optionally, the exhaust component further includes a temperature sensor. The temperature sensor is arranged on the side wall of the exhaust chamber, and the temperature sensor is used to detect the temperature of the waste gas.

[0013] Optionally, the exhaust component further includes a hydrocarbon content sensor. The hydrocarbon content sensor is arranged on the side wall of the exhaust chamber, and the hydrocarbon content sensor is used to detect the hydrocarbon content in the waste gas.

[0014] As described above, the evaporation gas combustion device for a ship's liquid cargo tank of the present invention has the following beneficial effects: The device of the present invention can collect the excess evaporated gas, store the gas in the gas collection tank, and then transport the gas evaporated from the liquefied natural gas collected to the combustion assembly for combustion. Since the device can store the excess gas first, the excess gas can be stably transported to the combustion assembly for combustion, thereby actively controlling the excess gas and achieving a stable pressure in the liquid cargo tank. Since the excess gas is ignited in the combustion assembly, greenhouse gas emissions are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It shows a schematic diagram of the evaporation gas combustion device for a ship's liquid cargo tank in an embodiment of the present invention.

[0016] Figure 2 It shows a schematic diagram of the fine-tuning component and the fixing component in an embodiment of the present invention.

[0017] Figure 3 It shows a schematic diagram of the exhaust component in an embodiment of the present invention.

[0018] DESCRIPTION OF REFERENCE NUMERALS

[0019] 1. Delivery valve; 2. Main gas valve; 3. Quick closing valve; 4. Purge valve; 5. Vent valve; 6. Fan; 7. Combustion support mixing chamber; 8. Combustion chamber; 9. Ignition component; 10. Light sensor; 11. Support frame; 12. Cylinder; 13. Connecting web; 14. Limiting plate; 15. Limiting rod; 16. Moving rod; 17. Fire baffle; 18. Exhaust chamber; 19. Temperature sensor; 20. Hydrocarbon content sensor. DETAILED DESCRIPTION OF THE INVENTION

[0020] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0021] When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally in a non-general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention here. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0022] For convenience of description, spatial relationship terms such as "below", "beneath", "lower", "under", "above", "on" may be used herein to describe the relationship of one element or feature shown in the drawings to other elements or features. It will be understood that these spatial relationship terms are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the drawings. Further, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers or there can be one or more intervening layers. As used herein, "between... and..." means including the endpoint values.

[0023] In the context of the present application, the structure in which the first feature is "above" the second feature as described may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0024] It should be noted that the diagrams provided in this embodiment only schematically illustrate the basic concept of the present invention. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0025] As Figure 1 shown, the present invention provides a combustion device for the evaporation gas of a ship's liquid cargo tank. The device uses the evaporated liquefied natural gas as fuel, actively collects the evaporated gas and burns it to reduce greenhouse gas emissions. The device includes a controller, a gas collection tank, a collection component, a gas valve group, a blower component, and a combustion mechanism. One end of the collection component is configured to be connected to the top of the liquid cargo tank for collecting the excess evaporated gas. The other end of the collection component is connected to the gas collection tank. The collection component can suck the excess evaporated gas inside the liquid cargo tank into the gas collection tank for storage. The collection component includes a gas-liquid separator, which can block the liquid phase when sucking the excess gas. The gas valve group is used to transport the collected excess gas to the combustion assembly. Among them, the gas valve group can control the transport volume of the gas, so as to control the proportional control of the gas intake volume. The blower component is used to supplement air into the combustion mechanism to enable the gas to burn in the combustion mechanism.

[0026] The gas valve group includes a delivery valve 1, a main gas valve 2, a quick - closing valve 3, a purging valve 4, and a vent valve 5. The delivery valve 1, the main gas valve 2, and the quick - closing valve 3 are connected in series in sequence through gas pipes to form a main gas transmission pipeline. The outlet of the quick - closing valve 3 is connected to the combustion mechanism through a gas pipe. The vent valve 5 and the purging valve 4 are connected to the pipeline between the combustion mechanism and the quick - closing valve 3 through gas pipes. The number of purging valves 4 is two. The outlets of the two purging valves 4 are respectively connected to the pipeline between the quick - closing valve 3 and the combustion mechanism through gas pipes, and the inlets of the two purging valves 4 are connected in parallel to the same nitrogen gas supply mechanism through gas pipes. Among them, the gas pipe is a double - wall pipe, and there are two spaces for transporting gas inside the double - wall pipe. The inner space of the double - wall pipe is used for transporting gas, and the outer space is used for transporting air.

[0027] Among them, the delivery valve 1 is used to control the on - off between the gas valve group and the pipeline in the front section of the gas valve group. For example, when there is a pipeline leak and emergency maintenance is required, the delivery valve 1 can be manually closed to interrupt the gas transmission.

[0028] The main gas valve 2 is used to control the gas transmission. For example, when it is necessary to adjust the gas transmission volume, the opening degree of the main gas valve 2 can be adjusted to change the gas transmission ratio; when it is necessary to stop the device from working, the main gas valve 2 can be closed to stop the gas transmission.

[0029] The quick - closing valve 3 plays a role in security - cut - off of gas transmission. When an emergency alarm occurs during the operation of the device, in order to avoid risks such as gas explosion, the quick - closing valve 3 will quickly close to cut off the gas transmission at this time.

[0030] In this embodiment, the vent valve 5 and the purging valve 4 are used to realize the purging work of the gas pipes in the gas valve group and the combustion mechanism. For example, when an emergency alarm occurs, the quick - closing valve 3 will urgently cut off the gas supply. When the alarm is lifted and gas supply needs to continue, there will be an explosive mixed gas in the gas pipes in the gas valve group at this time. To remove the mixed gas, the purging valve 4 is opened to allow nitrogen gas to enter the gas pipes in the gas valve group. At the same time, the vent valve 5 is in the open state. At this time, a part of the nitrogen gas is discharged through the vent valve 5 and the mixed gas is discharged from the gas valve group, and another part of the nitrogen gas will enter the combustion mechanism and be discharged from the exhaust chamber 18, so as to discharge the residual mixed gas in the combustion mechanism. Since two purging valves 4 are provided in this embodiment, the purging efficiency is improved.

[0031] In this embodiment, a secondary gas pipeline is also connected to the main gas pipeline. The secondary gas pipeline is formed by connecting a conveying valve 1 and a main gas valve 2 in series. The gas pipe connecting the conveying valve 1 and the main gas valve 2 is also a double-wall pipe. The inlet of the conveying valve 1 on the secondary gas pipeline and the inlet of the conveying valve 1 on the main gas pipeline are connected in parallel to the gas collecting tank. The outlet of the main gas valve 2 on the secondary gas pipeline is connected to the pipeline between the quick-closing valve 3 and the combustion mechanism on the main gas pipeline. The secondary gas pipeline is used for pre-ignition. When the combustion mechanism is working, a small amount of gas is first conveyed through the secondary gas pipeline. At this time, the air blowing assembly blows a small amount of air, and the ignition assembly 9 performs pre-ignition. After the pre-ignition is completed, the main gas pipeline transports gas normally, the air blowing assembly blows air normally, and the ignition assembly 9 performs main ignition.

[0032] The air blowing assembly includes a plurality of fans 6. In this embodiment, there are three fans 6. The three fans 6 are arranged around the circumference of the combustion assembly. The three fans 6 are all connected to the combustion assembly through air ducts. The three fans 6 transport air to the combustion assembly to assist in the combustion of gas. Among them, the air delivery volume of the three fans 6 can be adjusted by controlling the rotation speed of the controller or a regulating valve is provided at the air outlet of each fan 6. The controller adjusts the air delivery volume by controlling the opening degree of the regulating valve. When the combustion mechanism is in the pre-ignition stage, one of the fans 6 blows air. When the combustion mechanism is in the main ignition stage, at least two fans 6 blow air. When two fans 6 are used to blow air, the third fan 6 is used as a backup.

[0033] As Figure 1 and Figure 2 shown, the combustion mechanism includes a combustion-supporting mixing chamber 7, a fixing component, a combustion assembly, a fine-tuning component, and an exhaust component. The combustion-supporting mixing chamber 7 is communicated with the three fans 6. The outlet of the quick-closing valve 3 is connected to the combustion-supporting mixing chamber 7 through a gas pipe. In addition, the combustion-supporting mixing chamber 7 is communicated with the gas valve group. The gas conveyed by the gas valve group and the air conveyed by the fans 6 are mixed in the combustion-supporting mixing chamber 7 to facilitate more complete combustion of the gas and more stable combustion. In the prior art, the structural design of the combustion-supporting mixing chamber 7 has been mature and will not be described in detail here.

[0034] The combustion assembly of this embodiment is fixed to the bulkhead structure on the ship through a fixing component. The combustion assembly is arranged above the combustion-aid mixing chamber 7 and the two are connected. The gas mixed in the combustion-aid mixing chamber 7 enters the combustion assembly for combustion. The combustion assembly includes a combustion chamber 8, an ignition component 9, and a photosensor 10. The combustion chamber 8 is connected to the combustion-aid mixing chamber 7 and is located above the combustion-aid mixing chamber 7. The ignition component 9 is connected to the inner side wall of the combustion chamber 8, and the controller can control the ignition component 9 to ignite the mixed gas in the combustion chamber 8. The photosensor 10 is connected to the inner side wall of the combustion chamber 8 and is used to detect whether the combustion flame of pre-ignition is normal. In the pre-ignition stage, when the photosensor 10 detects a flame, it indicates that the pre-ignition in the combustion chamber 8 is successful; otherwise, the pre-ignition fails. The photosensor 10 sends the detected data to the controller. If the ignition fails, the controller gives an alarm prompt and the staff conducts maintenance; if the ignition is successful, the controller controls the main gas valve 2 to open for gas supply, and at the same time increases the air supply volume of the blower 6 and increases the number of working blowers 6.

[0035] The fixing component includes a support frame 11, a cylinder 12, and a connecting web 13. The support frame 11 is fixed to the top of the combustion chamber 8. One end of the cylinder 12 is fixed to the support frame 11, and the other end of the cylinder 12 is connected to the connecting web 13. The connecting web 13 is fixed to the bulkhead structure by welding. The cylinder 12 plays a buffering role to prevent potential hazards caused by deflagration vibration. The number of fixing components in this embodiment is multiple, depending on the specific situation. The combustion chamber 8 is fixed to the bulkhead structure through the fixing component.

[0036] The fine-tuning component includes a limit frame, a movable rod 16, and a fire baffle 17. There are four limit frames and four movable rods 16. The limit frames are evenly arranged on the top of the combustion chamber 8 and are spaced apart from the support frame 11 of the fixing device. The limiting member includes two limiting plates 14 and a limiting rod 15. The two limiting plates 14 are oppositely arranged in the combustion chamber 8, and the limiting rod 15 is connected to the tops of the two limiting plates 14. The four movable rods 16 are evenly arranged on the circumferential side of the fire baffle 17. One end of each movable rod 16 is connected to the fire baffle 17, and the other end of each movable rod 16 is slidably inserted radially along the combustion chamber 8 (cylindrical in this embodiment) between the two limiting plates 14 of each limiting member. The limiting rod 15 is located above the movable rod 16, and there are gaps between the horizontal two side surfaces of the movable rod 16 and the corresponding two limiting plates 14, so that the movable rod 16 can make a small amount of movement between the two limiting plates 14 and along the direction parallel to the limiting rod 15. When the four movable rods 16 are respectively inserted into the corresponding four limiting members, the fire baffle 17 is located at the central part of the combustion chamber 8. In this embodiment, each movable rod 16 is connected to a power component, and the power component is connected to the top of the combustion chamber 8. For example, the power component includes a motor and a gear transmission structure. The motor and the gear transmission structure are connected, the movable rod 16 and the corresponding gear transmission structure are connected, and the motor drives the movable rod 16 to make a small amount of movement radially along the combustion chamber 8 through the gear transmission structure. When the flame is not at the central position of the combustion chamber 8, the positions of the four movable rods 16 can be adjusted respectively to adjust the position of the fire baffle 17 at this time.

[0037] As Figure 1 and Figure 3 shown, the exhaust component includes an exhaust chamber 18, a temperature sensor 19, and a hydrocarbon content sensor 20. The exhaust chamber 18 is connected above the combustion chamber 8 and is in communication with the combustion chamber 8. The temperature sensor 19 and the hydrocarbon content sensor 20 are both arranged on the side wall of the exhaust chamber 18. The temperature sensor 19 is used to detect the temperature of the waste gas. When the temperature of the gas discharged from the exhaust chamber 18 is too high, it indicates that there is a problem with the gas-to-air volume ratio. At this time, the operator repairs the device. The hydrocarbon content sensor 20 is used to detect the quality of the waste gas. If the hydrocarbon content sensor detects that the hydrocarbon content exceeds the standard, it indicates that there is a problem with the gas-to-air volume ratio. At this time, the controller can automatically control the main gas valve 2 and the blower 6 for ratio adjustment or the staff can perform maintenance.

[0038] In summary, the implementation process of the evaporation gas combustion device for a ship's liquid cargo tank in this embodiment is as follows: Before the device starts working, a fault inspection needs to be carried out. First, control the actions of each valve in the gas valve group to check whether the valves are normal. Then, allow gas to be transported in the main gas pipeline and the auxiliary gas pipeline, and check the air in the outer space of the double-wall pipe in the main gas pipeline and the auxiliary gas pipeline. If there is a leakage in the double-wall pipe, the gas in the inner space of the double-wall pipe will enter the air in the outer space. At this time, by checking the hydrocarbon content in the air in the outer space, it can be known whether there is a leakage in the double-wall pipe. Then, send a simulated fault signal of the fan 6 to the controller. If the controller displays a fault in the fan 6 and starts the standby fan 6, the fault debugging of the fan 6 is completed. By sending different simulated fault signals to the controller according to the same operation, for example, the main gas valve 2 fault signal and the breather valve 5 fault signal, when the controller can give an alarm and interrupt the work, the fault debugging of the main gas valve 2 and the breather valve 5 is completed.

[0039] After the inspection and debugging are completed, the valve on the auxiliary gas pipeline is opened. First, a small amount of gas is transported through the auxiliary gas pipeline into the combustion-supporting mixing chamber 7, and at the same time, one of the fans 6 is turned on to send a small amount of air for combustion-supporting mixing in the combustion-supporting mixing chamber 7 to mix with the gas. Then, the mixed gas enters the combustion chamber 8, and the ignition assembly 9 performs pre-ignition. If the photosensor 10 detects a flame, the pre-ignition is successful. At this time, the conveying valve 1, the main gas valve 2, and the quick-closing valve 3 on the main gas pipeline are opened, and the purge valve 4 and the breather valve 5 are closed to normally transport gas to the combustion-supporting mixing chamber 7, and at the same time, other fans 6 are turned on to send air. When the gas burns, the exhaust gas is discharged from the exhaust chamber 18. At this time, the temperature sensor 19 and the hydrocarbon content sensor 20 on the exhaust chamber 18 detect the exhaust gas to check whether the exhaust gas temperature and hydrocarbon content meet the requirements.

[0040] The above embodiments only illustrate the principles and effects of the present invention by way of example, and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A combustion device for the evaporation gas of a ship's liquid cargo tank, characterized in that, Comprising: Gas collecting tank; A collecting component, one end of which is configured to be connected to the top of the liquid cargo tank for collecting excess evaporated gas, and the other end of the collecting component is connected to the gas collecting tank; A gas valve group, including a main gas pipeline and an auxiliary gas pipeline, both the main gas pipeline and the auxiliary gas pipeline are used for transporting gas, and the inlets of the main gas pipeline and the auxiliary gas pipeline are connected in parallel to the gas collecting tank; A combustion-supporting mixing chamber, both the main gas pipeline and the auxiliary gas pipeline are connected to the combustion-supporting mixing chamber; A blast component, connected to the combustion-supporting mixing chamber to enable air to enter the combustion-supporting mixing chamber to mix with the gas; A combustion assembly, communicating with the combustion-supporting mixing chamber, and the combustion assembly is used for igniting the mixed gas for combustion; Wherein, a small amount of gas is introduced into the combustion-supporting mixing chamber through the auxiliary gas pipeline, and a small amount of air is sent into the combustion-supporting mixing chamber by the blast component at the same time for mixing. After the combustion assembly pre-ignites and ignites the mixed gas, the main gas pipeline and the blast component introduce gas and air into the combustion-supporting mixing chamber in proportion for mixing, and the combustion assembly conducts main ignition to ignite the mixed gas.

2. The evaporation gas combustion device for a ship's liquid cargo tank according to claim 1, characterized in that: The gas valve group includes a conveying valve, a main gas valve and a quick-closure valve. The conveying valve, the main gas valve and the quick-closure valve are sequentially connected in series through a gas pipe to form the main gas pipeline. The outlet of the quick-closure valve is connected to the combustion-supporting mixing chamber through a gas pipe. The main gas valve is used for controlling and regulating the transportation of gas, and the quick-closure valve is used for emergency cutting off of gas transportation.

3. The evaporation gas combustion device for a ship's liquid cargo tank according to claim 2, wherein: The gas valve group further includes a purging valve and a venting valve. The purging valve and the venting valve are respectively connected to the pipeline between the quick-closure valve and the combustion-supporting mixing chamber through a gas pipe, and the venting valve is located between the quick-closure valve and the purging valve. The purging valve is used for opening during purging to transport purging gas, and the venting valve is used for opening during purging to discharge gas.

4. The evaporation gas combustion device for a ship's liquid cargo tank according to claim 2, characterized in that: The gas valve group further includes one said conveying valve and one said main gas valve. The auxiliary gas pipeline is composed of the conveying valve and the main gas valve. The inlet of the conveying valve on the auxiliary gas pipeline is connected in parallel to the gas collecting tank with the inlet of the conveying valve on the main gas pipeline. The outlet of the main gas valve on the auxiliary gas pipeline is connected to the pipeline between the quick-closure valve and the combustion assembly on the main gas pipeline.

5. The evaporation gas combustion device for a ship's liquid cargo tank according to claim 1, characterized in that: The combustion assembly includes a combustion chamber, an ignition component and a light sensor. The combustion chamber communicates with the combustion-supporting mixing chamber. The ignition component is arranged in the combustion chamber for pre-ignition and main ignition. The light sensor is arranged in the combustion chamber for detecting whether the ignition is successful.

6. The evaporation gas combustion device for a ship's liquid cargo tank according to claim 5, wherein: The combustion assembly further includes a fixing component. The fixing component includes a support frame, a cylinder and a connecting web. The support frame is fixed to the top of the combustion chamber. One end of the cylinder is fixed to the support frame, and the other end of the cylinder is connected to the connecting web. The connecting web is configured to be fixed to the bulkhead structure.

7. The evaporation gas combustion device for a ship's liquid cargo tank according to claim 5, characterized in that: The combustion assembly further includes a fine-tuning component, which includes a limiting frame, a movable rod, and a fire baffle. There are multiple limiting frames, and the multiple limiting frames are evenly arranged on the top of the combustion chamber. A movable rod is slidably inserted into each limiting frame. There is a gap between the horizontal two side surfaces of the movable rod and the limiting frame. The end of each movable rod away from the corresponding limiting frame is connected to the fire baffle. The fire baffle is located inside the combustion chamber and is used to adjust the position of the flame.

8. The evaporation gas combustion device for a ship's liquid cargo tank according to claim 1, characterized in that: The evaporation gas combustion device for a ship's liquid cargo tank further includes an exhaust component, which includes an exhaust chamber. The exhaust chamber is communicated with the combustion assembly and is used to discharge waste gas.

9. The evaporation gas combustion device for a ship's liquid cargo tank according to claim 8, characterized in that: The exhaust component further includes a temperature sensor, which is arranged on the side wall of the exhaust chamber. The temperature sensor is used to detect the temperature of the waste gas.

10. The evaporation gas combustion device for a ship's liquid cargo tank according to claim 8, characterized in that: The exhaust component further includes a hydrocarbon content sensor, which is arranged on the side wall of the exhaust chamber. The hydrocarbon content sensor is used to detect the hydrocarbon content in the waste gas.

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