A marine natural gas combustion device

Abstract

This invention discloses a marine natural gas combustion device, comprising a bellows, a furnace support cylinder, a burner, a combustion chamber, a Venturi air distribution structure, and an outer cylinder. A blower is connected to the bottom of the bellows. The furnace support cylinder is positioned above the bellows, and the burner is coaxially mounted on the upper surface of the furnace support cylinder, partially embedded within it, with a radius smaller than the furnace support cylinder. The combustion chamber is coaxially positioned above the furnace support cylinder, with a radius larger than the burner but smaller than the furnace support cylinder. The combustion chamber and the furnace support cylinder enclose the burner inside the combustion chamber, and the sealed space between the furnace support cylinder and the combustion chamber forms a primary cooling air channel. The top of the combustion chamber slopes inward and connects to the bottom of the Venturi air distribution structure, while the top of the Venturi air distribution structure communicates with the external environment. The burner is equipped with a BOG (Bottle-Off Gas) intake channel and a combustion air channel. The outer cylinder is positioned along the outer circumference of the combustion device. This invention solves the problems of poor cooling performance and bulky, cumbersome nature of existing equipment.

Description

Technical Field

[0001] This invention belongs to the field of marine technology, specifically relating to a marine natural gas combustion device. Background Technology

[0002] Liquefied natural gas (LNG) carriers use cargo tanks to store LNG. During transportation, because it's impossible to completely prevent heat exchange between the cargo tanks and the outside environment, the LNG inevitably absorbs heat and vaporizes into natural gas; this gas is commonly referred to as boil-off gas (BOG). While BOG can be utilized by dual-fuel engines, dual-fuel generators, and boilers, it cannot be completely consumed. The continuous generation of BOG increases the pressure in the cargo tanks. To control the pressure and ensure the safe storage and transportation of LNG, BOG needs to be released to reduce the tank pressure.

[0003] In the past, BOG (Bloody Bulk Gas) was directly emitted into the atmosphere. However, in recent years, to avoid the large-scale emission of methane from BOG exacerbating the greenhouse effect, it is usually necessary to burn BOG before emission. Furthermore, according to the IGC (International Code for the Construction and Equipment of Liquefied Gas Ships in Bulk) regulations, the flue gas outlet temperature of the emission devices for LNG carriers needs to be controlled below 450°C. To achieve low-temperature emissions, existing technologies all involve increasing the air supply to cool the flue gas. However, a significant increase in air supply would result in bulky and cumbersome equipment.

[0004] Due to limited internal space and restrictions on maximum ship height, the design dimensions of marine equipment have always been an important technical indicator. Excessively large evaporative gas treatment equipment will increase the design difficulty and manufacturing cost of the ship. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a marine natural gas combustion device that employs a Venturi-type staged air distribution structure. It utilizes combustion to process BOG from LNG carriers, achieving complete combustion of BOG and zero methane emissions. The generated flue gas is cooled before being discharged, increasing the mixing and cooling rate of the flue gas with air, thus achieving rapid cooling of the flue gas and improving the compactness of the equipment.

[0006] The objective of this invention is achieved through the following technical solution: a marine natural gas combustion device, comprising a bellows, a furnace support cylinder, a burner, a combustion chamber, a Venturi air distribution structure, and an outer cylinder.

[0007] The bottom of the bellows is connected to the blower.

[0008] The furnace body support cylinder is located above the air box, and the burner is coaxially mounted on the upper surface of the furnace body support cylinder. The burner part is embedded in the furnace body support cylinder, and the burner radius is smaller than that of the furnace body support cylinder.

[0009] The combustion chamber is coaxially positioned above the furnace support cylinder. The radius of the combustion chamber is larger than that of the burner but smaller than that of the furnace support cylinder. The combustion chamber and the furnace support cylinder enclose the burner inside the combustion chamber. The sealed space inside the furnace support cylinder and the combustion chamber forms a primary cooling air channel.

[0010] The top of the combustion chamber slopes inward and connects to the bottom of the Venturi air distribution structure, while the top of the Venturi air distribution structure is connected to the external environment.

[0011] The burner is equipped with a BOG intake passage and a combustion air passage.

[0012] The outer cylinder is arranged along the outer circumference of the incineration device and extends to the top of the Venturi air distribution structure.

[0013] Preferably, the height of the furnace body support cylinder H3 is 1.9m-2.2m.

[0014] Preferably, the burner is a dual-fuel burner, which uses fuel oil for ignition and has a combustion-supporting function. The diameter D5 of the burner is determined according to the maximum BOG throughput Q, and the average flow velocity at the burner outlet is 10m / s-20m / s.

[0015] Preferably, the combustion chamber diameter D4 and the burner diameter D5 satisfy D4:D5=1.4-1.7; the combustion chamber height H2=(1.5-2.5)D4; the combustion chamber outlet diameter D3 satisfies D3=(0.6-0.8)D4; and the combustion chamber narrowing angle α1=30°-60°.

[0016] Preferably, the Venturi air distribution structure includes an air inlet section, an inclined section, a branch inlet, a throat section, an ejector nozzle, a flared section, and a stabilizing section. The air inlet section is connected to the furnace support cylinder along its circumference, and the inner side of the inlet section forms a secondary cooling air channel with the outer side of the combustion chamber. The lower end of the inclined section is connected to the top of the air inlet section, and the upper end of the inclined section slopes inward at an angle equal to the angle of inclination at the top of the combustion chamber. The branch inlets are evenly distributed on the circumference of the inclined section. The throat section is connected to the top of the inclined section and is a straight pipe section. An ejector nozzle is provided on the wall of the throat section, extending towards the center. The flared section is connected to the upper end of the throat section and slopes outward upward until it expands to the same radius as the air inlet section. The stabilizing section is connected to the upper end of the flared section and is a straight cylindrical structure, with the upper part of the stabilizing section communicating with the atmosphere.

[0017] Preferably, the diameter of the air inlet section is equal to the diameter of the flow stabilization section, D1, which is determined based on the maximum BOG capacity and the flue gas velocity under standard conditions of 8m / s-12m / s.

[0018] Preferably, the inclination angle α2 of the beveled section is 30°-60°.

[0019] Preferably, the height of the flared section H5 is greater than or equal to 1.5D1, and the height of the steady flow section H4 is greater than or equal to D1.

[0020] Preferably, the diameter of the throat segment D2 = (0.5-0.6)D1, and the height of the throat segment H6 ≥ 0.5D2.

[0021] Preferably, the length H9 of the ejector nozzle extending towards the center is (0.1-0.3)D2.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] This invention provides a marine natural gas combustion device that collects air from a fan via a bellows and distributes it through a combustion chamber. The burner, in conjunction with a Venturi air distribution structure, divides the fan-supplied air into three parts: combustion air, primary cooling air, and secondary cooling air. The combustion air and the BOG (Bottle-Off Gas) injected by the burner combine to form high-temperature flue gas (approximately 1500°C). This high-temperature flue gas is mixed and cooled (to 800-1000°C) with the primary cooling air in the combustion chamber, and then enters the venturi throat through a constriction, forming a high-speed jet of high-temperature flue gas. The secondary cooling air... The flue gas enters the Venturi structure through the outer channel and, under the influence of a high-speed jet, is divided into two parts to mix with the flue gas. One part flows inward through the Venturi oblique channel, mixing while protecting the metal wall from high temperatures. The other part flows directly into the center of the high-temperature flue gas through the diversion port of the oblique section and the ejector nozzle of the throat section, under the low-pressure ejection effect formed by the high-speed jet, achieving efficient cooling of the high-temperature flue gas. Then, it undergoes enhanced cooling through the flared section of the Venturi structure, achieving uniform temperature distribution. Finally, it is discharged into the atmosphere through the stabilization section. The staged air distribution cooling method adopted in this invention can enhance the mixing of flue gas and air, improve the cooling rate, and the device diameter of this invention can be reduced by 20% compared with similar products, improving the device compactness. This invention is applied to the field of marine safety emission devices, which can enhance the mixing capacity of flue gas and cooling air, achieve rapid cooling, and improve the compactness of natural gas combustion devices, solving the problem of large and cumbersome equipment caused by poor cooling effect in current products. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a marine natural gas combustion device according to the present invention;

[0025] Figure 2 This is a schematic diagram of the Venturi air distribution structure in an embodiment of the present invention;

[0026] Figure 3 This is a cross-sectional view of the throat segment in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram illustrating the air supply principle of the marine natural gas combustion device in an embodiment of the present invention.

[0028] In the diagram, 1 is the bellows; 2 is the furnace support cylinder; 3 is the burner; 4 is the combustion chamber; 5 is the Venturi air distribution structure; 6 is the outer cylinder; 7 is the primary cooling air passage; 8 is the secondary cooling air passage; 9 is the BOG air inlet passage; 10 is the combustion air passage; 11 is the air inlet; 5.1 is the air inlet section; 5.2 is the inclined section; 5.3 is the diversion port; 5.4 is the throat section; 5.5 is the ejector nozzle; 5.6 is the flaring section; and 5.7 is the flow stabilization section. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0030] like Figure 1 As shown, the technical solution of the present invention provides a marine natural gas combustion device, including a bellows 1, a furnace support cylinder 2, a burner 3, a combustion chamber 4, a Venturi air distribution structure 5, and an outer cylinder 6.

[0031] The bottom of the air box 1 is connected to a fan, which collects the air supplied by the fan. The air enters the interior of the air box 1 from the air inlets 11 on both sides of the air box 1, and then supplies air to the marine natural gas combustion device from bottom to top. The height H10 of the air box 1 is determined according to the actual available space.

[0032] The furnace body support cylinder 2 is set above the air box 1, and the burner 3 is coaxially set on the upper surface of the furnace body support cylinder 2. The burner 3 is partially embedded in the furnace body support cylinder 2, and the radius of the burner 3 is smaller than that of the furnace body support cylinder 2.

[0033] The combustion chamber 4 is coaxially positioned above the furnace support cylinder 2. The radius of the combustion chamber 4 is larger than that of the burner 3 and smaller than that of the furnace support cylinder 2. The combustion chamber 4 and the furnace support cylinder 2 enclose the burner 3 inside the combustion chamber 4. The sealed space inside the furnace support cylinder 2 and the combustion chamber 4 forms a primary cooling air channel 7.

[0034] The top of the combustion chamber 4 is tilted inward and connected to the bottom of the venturi air distribution structure 5. The top of the venturi air distribution structure 5 is connected to the external environment.

[0035] The burner 3 is equipped with a BOG air intake channel 9 and a combustion air channel 10.

[0036] The outer cylinder 6 is arranged along the outer circumference of the incineration device and extends to the top of the Venturi air distribution structure 5. The outer cylinder 6 is the outer shell of the incineration device to prevent gas leakage inside the device and to allow all flue gas to be discharged into the atmosphere from above through the outlet.

[0037] In some embodiments of the present invention, the furnace body support cylinder 2 is used to connect the bellows 1 and the furnace body, to support the furnace body, to provide a space between the furnace body and the bellows 1, as a fluid development section for the air supplied by the bellows 1, and as a maintenance space for the equipment; since it is used for manual maintenance of the equipment, unless otherwise specified, the height H3 of the furnace body support cylinder 2 is 1.9m-2.2m.

[0038] In some embodiments of the present invention, the burner 3 is a dual-fuel burner that uses fuel oil for ignition and has a combustion-supporting function. It is used to inject BOG into the combustion chamber, mix it with air, and burn it. The diameter D5 of the burner 3 is determined according to the maximum BOG throughput Q, and the average flow velocity at the burner outlet is 10m / s-20m / s.

[0039] In some embodiments of the present invention, the combustion chamber 4 serves as the reaction space for the BOG combustion process and is vented with primary cooling air to cool the flue gas after combustion; the diameter D4 of the combustion chamber 4 and the burner diameter D5 satisfy D4:D5 = 1.4-1.7; the height H2 of the combustion chamber 4 is 1.5-2.5D4; the outlet diameter D3 of the combustion chamber 4 satisfies D3 = 0.6-0.8D4; and the narrowing angle α1 of the combustion chamber 4 is 30°-60°.

[0040] like Figures 2 to 3 As shown, in some embodiments of the present invention, the Venturi air distribution structure 5 includes an inlet section 5.1, an inclined section 5.2, a diverter 5.3, a throat section 5.4, an ejector nozzle 5.5, a flared section 5.6, and a flow stabilizing section 5.7; wherein, the inlet section 5.1 is connected to the furnace body support cylinder 2 along the circumference of the furnace body support cylinder 2, and the inner side of the inlet section 5.1 and the outer side of the combustion chamber 4 form a secondary cooling air channel 8; the lower end of the inclined section 5.2 is connected to the top end of the inlet section 5.1, and the upper end of the inclined section 5.2 is inclined inward, with the inclination angle equal to the inclination angle of the top end of the combustion chamber 4; the diverter 5.3 consists of circular holes evenly distributed on the circumference of the inclined section 5.2 for passing through part of the ejected secondary cooling air; the throat section 5.4 is connected to the top end of the inclined section 5.2, and the throat section 5.4 is the middle straight section of the Venturi air distribution structure 5. The pipe section is used to increase the jet velocity, form a low-pressure zone, and achieve the ejection effect. The throat section 5.4 is equipped with an ejector nozzle 5.5 on its wall, which extends towards the center to guide part of the secondary cooling air to the center of the jet for cooling the high-temperature part at the center. The flared section 5.6 is the mixing area of ​​the Venturi air distribution structure 5. The air ejected through the throat section 5.4 is mixed in the flared section 5.6. The stabilizing section 5.7 is used to stabilize the cooled flue gas, so that the flue gas is stably discharged into the atmosphere. The flared section 5.6 is connected to the upper end of the throat section 5.4. The flared section 5.6 is inclined upward and outward until it expands to the same radius as the air inlet section 5.1. The stabilizing section 5.7 is connected to the upper end of the flared section 5.6 and is a straight cylindrical structure. The upper part of the stabilizing section 5.7 is open to the atmosphere.

[0041] In some embodiments of the present invention, the dimensional requirements of each section in the Venturi air distribution structure 5 are as follows: the diameter of the inlet section 5.1 is equal to the diameter D1 of the flow stabilizing section 5.7, where D1 is determined based on the maximum BOG throughput and the flue gas velocity under standard conditions of 8 m / s-12 m / s; the height H8 of the inlet section 5.1 is determined based on the height H2 of the combustion chamber 4 to ensure that the size of the secondary cooling air passage remains unchanged. The inclination angle α2 of the inclined section 5.2 is 30°-60°, and the height H7 of the inclined section 5.2 is determined based on the height of the combustion chamber 4 to ensure that the size of the secondary cooling air passage remains unchanged. The height H5 of the flared section 5.6 is ≥1.5D1, and the height H4 of the flow stabilizing section 5.7 is ≥D1. The diameter D2 of the throat section 5.4 is 0.5-0.6D1, and the height H6 of the throat section 5.4 is ≥0.5D2. The length H9 of the ejector nozzle 5.5 extending towards the center is 0.1-0.3D2. The total height H1 of the Venturi wind distribution structure 5 is H4 + H5 + H6 + H7 + H8.

[0042] like Figure 4 As shown, the incineration device collects air from the blower through the air box 1, which is divided into three parts: combustion air, primary cooling air, and secondary cooling air. The combustion air and the BOG injected by the burner 3 combine to form high-temperature flue gas (approximately 1500°C). The high-temperature flue gas is mixed and cooled with the primary cooling air (approximately 800-1000°C flue gas) in the combustion chamber 4, and then enters the throat section 5.4 through the narrowing of the inclined section 5.2, forming a high-speed jet of high-temperature flue gas. The secondary cooling air enters the Venturi air supply structure through the outer ring channel, and under the guidance of the high-speed jet, it is divided into two parts and mixes with the flue gas. The gas is mixed, and part of it flows from the outside to the inside of the flue gas through the Venturi inclined section 5.2, protecting the metal wall surface from high temperature while mixing. The other part flows directly into the center of the high-temperature flue gas through the diversion port 5.3 of the inclined section 5.2 and the ejector nozzle 5.5 of the throat section 5.4. Under the low-pressure ejection effect formed by the high-speed jet, it directly enters the center of the high-temperature flue gas, achieving efficient cooling of the high-temperature flue gas. Then, it is further cooled through the flared section 5.6 of the Venturi air supply structure 5 to achieve uniform temperature distribution. Finally, it is discharged into the atmosphere through the stabilizing section 5.7.

[0043] The following specific example further illustrates the marine natural gas combustion device provided in the technical solution of this invention:

[0044] This embodiment provides a Venturi-type marine natural gas combustion device, designed for a BOG (Boiled Air Gas) processing capacity of 3600 kg / h and an exhaust gas temperature requirement of ≤450℃. The device includes a wind box 1, a furnace support cylinder 2, a burner 3, a combustion chamber 4, a Venturi air distribution structure 5, and an outer cylinder 6. The Venturi air distribution structure includes 5.1 an air inlet section, 5.2 an inclined section, 5.3 a diversion port, 5.4 a throat section, 5.5 an ejector nozzle, 5.6 a flaring section, and 5.7 a flow stabilizing section; the total height H1 of the Venturi air distribution structure 5 is 14.5 m.

[0045] The air inlet section 5.1 and the combustion chamber 4 form a secondary cooling air channel. The diameter of the air inlet section 5.1 is the furnace body diameter (i.e., the flow stabilizing section 5.7) D1 = 3500mm; the height is H8 = 3300mm.

[0046] The inclined section 5.2 is used to guide the secondary cooling air to mix with the high-temperature flue gas, and a diversion port 5.3 is set on the inclined section 5.2 so that part of the air is drawn by the high-speed jet of the throat section 5.4 and enters the center of the high-temperature flue gas through the ejector nozzle 5.5; the inclined angle α2 of the inclined section 5.2 is 45°, which is consistent with the constriction angle of the combustion chamber 4; the height of the inclined section 5.2 is H7 = 1200mm.

[0047] The diversion port 5.3 is a circular hole opened on the inclined section 5.2, evenly distributed around the circumference, used to pass through part of the ejected secondary cooling air.

[0048] The throat section 5.4 is a straight pipe section in the Venturi air distribution structure 5, used to increase the jet velocity, form a low-pressure zone, and achieve the ejection effect; the diameter of the throat section 5.4 is D2 = 2000 mm; the height of the throat section 5.4 is H6 = 1000 mm.

[0049] The ejector nozzle 5.5 is located on the wall of the throat section 5.4 and extends towards the center with an extension length H9 = 250 mm; it is used to guide part of the secondary cooling air of the ejector to the center of the jet to cool the high-temperature part in the center.

[0050] The flared section 5.6 is the mixing area of ​​the Venturi air distribution structure 5. The air ejected through the throat section 5.4 will be mixed in the flared section 5.6. The height of the flared section 5.6 is H5 = 5500mm.

[0051] The flow stabilization section 5.7 is used to stabilize the cooled flue gas, so that the flue gas can be discharged stably into the atmosphere; the length of the flow stabilization section 5.7 is H4 = 3500 mm.

[0052] The air box 1 is used to connect to the blower, collect the air supplied by the blower, and then supply air to the marine natural gas combustion device from bottom to top; the height of the air box 1, H10, is 5000mm.

[0053] The furnace body support cylinder 2 is used to connect the air box 1 and the furnace body, to support the furnace body, to provide a space between the furnace body and the air box 1, to serve as the fluid development section for the air supplied by the air box 1, and to serve as the maintenance space for the equipment; since it is used for manual maintenance of the equipment, the height H3 of the furnace body support cylinder 2 is 2000mm.

[0054] Burner 3 is a dual-fuel burner that uses fuel oil for ignition and has an auxiliary combustion function. It is used to inject BOG into the combustion chamber, mix it with air, and burn it. The diameter of burner 3 is D5 = 1200 mm.

[0055] Combustion chamber 4 serves as the reaction space for the BOG combustion process and is vented with primary cooling air to cool the flue gas after combustion. The diameter of combustion chamber 4 is D4 = 2200 mm, the height of combustion chamber 4 is H2 = 4000 mm, and the outlet diameter is D3 = 1600 mm. The constriction angle of combustion chamber 4 is α1 = 45°.

[0056] The outer cylinder 6 is the outer shell of the combustion device, which prevents gas leakage inside the device and allows all flue gas to be discharged into the atmosphere from the top through the outlet.

[0057] It is understood that the dimensions and angles of the components in the incineration device can be adjusted accordingly to accommodate different BOG processing volumes and flue gas temperature requirements, and these adjustments should be considered within the scope of protection of this invention.

[0058] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A marine natural gas combustion device, characterized in that: The incineration device includes a bellows (1), a furnace support cylinder (2), a burner (3), a combustion chamber (4), a Venturi air distribution structure (5), and an outer cylinder (6). The bottom of the air box (1) is connected to a fan; The furnace body support cylinder (2) is located above the air box (1), and the burner (3) is coaxially located on the upper surface of the furnace body support cylinder (2). The burner (3) is partially embedded in the furnace body support cylinder (2), and the radius of the burner (3) is smaller than that of the furnace body support cylinder (2). The combustion chamber (4) is coaxially arranged above the furnace body support cylinder (2). The radius of the combustion chamber (4) is larger than that of the burner (3) and smaller than that of the furnace body support cylinder (2). The combustion chamber (4) and the furnace body support cylinder (2) enclose the burner (3) inside the combustion chamber (4). The furnace body support cylinder (2) and the sealed space inside the combustion chamber (4) form a primary cooling air channel (7). The top of the combustion chamber (4) is inclined inward and connected to the bottom of the Venturi air distribution structure (5). The top of the Venturi air distribution structure (5) is connected to the external environment. The burner (3) is provided with a BOG air intake channel (9) and a combustion air channel (10). The outer cylinder (6) is arranged along the outer circumference of the incineration device and extends to the top of the Venturi air distribution structure (5); The Venturi air distribution structure (5) includes an air inlet section (5.1), an inclined section (5.2), a diversion port (5.3), a throat section (5.4), an ejector nozzle (5.5), a flared section (5.6), and a flow stabilizing section (5.7). The air inlet section (5.1) is connected to the furnace support cylinder (2) along its circumference, and the inner side of the air inlet section (5.1) forms a secondary cooling air channel (8) with the outer side of the combustion chamber (4). The lower end of the inclined section (5.2) is connected to the top end of the air inlet section (5.1), and the upper end of the inclined section (5.2) is inclined inwards at an angle equal to the inclination angle of the top end of the combustion chamber (4). The diversion ports (5.3) are evenly distributed on the circumference of the inclined section (5.2); the throat section (5.4) is connected to the top of the inclined section (5.2) and is a straight pipe section. The ejector nozzle (5.5) is provided on the wall of the throat section (5.4) and extends towards the center; the flared section (5.6) is connected to the upper end of the throat section (5.4) and the flared section (5.6) expands outwards until it expands outwards to the same radius as the air inlet section (5.1); the stabilizing section (5.7) is connected to the upper end of the flared section (5.6) and is a straight cylindrical structure. The upper part of the stabilizing section (5.7) is connected to the atmosphere.

2. The marine natural gas combustion device as described in claim 1, characterized in that: The height H3 of the furnace body support cylinder (2) is 1.9m-2.2m.

3. The marine natural gas combustion device as described in claim 1, characterized in that: The burner (3) is a dual-fuel burner that uses fuel oil for ignition and has combustion-supporting function. The diameter D5 of the burner (3) is determined according to the maximum BOG throughput Q, and the average flow velocity at the burner outlet is 10m / s-20m / s.

4. A marine natural gas combustion device as described in claim 1, characterized in that: The diameter D4 of the combustion chamber (4) and the diameter D5 of the burner satisfy D4:D5=1.4-1.7; the height H2 of the combustion chamber (4) is 1.5-2.5D4; the outlet diameter D3 of the combustion chamber (4) satisfies D3=0.6-0.8D4; the constriction angle α1 of the combustion chamber (4) is 30°-60°.

5. A marine natural gas combustion device as described in claim 1, characterized in that: The diameter of the air inlet section (5.1) is equal to the diameter D1 of the flow stabilization section (5.7). D1 is determined based on the maximum BOG capacity and the flue gas velocity under standard conditions of 8m / s-12m / s.

6. A marine natural gas combustion device as described in claim 1, characterized in that: The inclined angle α2 of the oblique section (5.2) is 30°-60°.

7. A marine natural gas combustion device as described in claim 1, characterized in that: The height H5 of the flared section (5.6) is ≥1.5D1, and the height H4 of the stabilizing section (5.7) is ≥D1.

8. A marine natural gas combustion device as described in claim 1, characterized in that: The diameter of the throat segment (5.4) is D2 = 0.5-0.6D1, and the height of the throat segment (5.4) is H6 ≥ 0.5D2.

9. A marine natural gas combustion device as described in claim 8, characterized in that: The length H9 of the ejector nozzle (5.5) extending toward the center is 0.1-0.3D2.

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