Direct-fired marine inert gas generator

Abstract

The utility model discloses a direct combustion type marine inert gas generator relates to the technical field of inert gas generator, include: combustion chamber, combustion subassembly is set up in the inside one end of combustion chamber, cooling subassembly is set up in the other end of combustion chamber, and is used for recycling the heat that direct combustion type marine inert gas generator generates, inert gas export subassembly is set up in the top of cooling subassembly, drainage subassembly is set up in the bottom of cooling subassembly, support block is set up in the bottom of combustion chamber near combustion subassembly, control panel is set up in the outside of combustion chamber. The utility model not only can efficiently, continuously produce the inert gas for the safety of marine cargo oil tank, still can have flue gas cooling and waste heat recovery function, can heat domestic water while reducing flue gas temperature efficiently, improve energy utilization efficiency.

Description

Technical Field

[0001] This utility model relates to the field of inert gas generator technology, and more specifically, to a direct-fired marine inert gas generator. Background Technology

[0002] Direct-fired inert gas generators are critical safety devices that produce low-oxygen inert gases through the direct combustion of fuel, and are widely used in tankers, chemical tankers, and other vessels. Their core function is to consume oxygen from the air during combustion, generating inert gases primarily composed of nitrogen and carbon dioxide. After cooling, washing, and dehumidification, these gases are delivered to the ship's cargo oil tanks, effectively replacing the air and reducing the oxygen concentration to a safe threshold. This prevents the formation of flammable or explosive mixtures between cargo oil vapors and air, ensuring the inherent safety of the ship throughout the loading, unloading, navigation, and berthing processes. Therefore, designing direct-fired marine inert gas generators specifically suited to the complex operating conditions of ships is of paramount importance.

[0003] However, existing marine inert gas generators generally cool and scrub the flue gas produced by combustion by spraying seawater or fresh water, lacking effective utilization of the waste heat of the high-temperature flue gas after combustion. This results in a significant amount of heat energy being directly lost, leading to energy waste. Secondly, due to the high flow velocity and short residence time of the flue gas in the combustion chamber and scrubbing tower, and the lack of an effective flow field control structure, the contact time between the sprayed water and the flue gas is insufficient, resulting in low heat exchange efficiency. This leads to inadequate cooling and scrubbing effects, easily causing the outlet flue gas temperature to be too high, affecting the quality of subsequent inert gas and the safety of the cargo oil tanks.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes a direct-fired marine inert gas generator to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows: A direct-fired marine inert gas generator includes: a combustion chamber; a combustion assembly disposed inside one end of the combustion chamber; a cooling assembly disposed at the other end of the combustion chamber and used to recover heat generated by the direct-fired marine inert gas generator; an inert gas outlet assembly disposed at the top of the cooling assembly; a drainage assembly disposed at the bottom of the cooling assembly; a support block disposed at the bottom of the combustion chamber near the combustion assembly; and a control panel disposed outside the combustion chamber.

[0007] Furthermore, in order to achieve complete combustion of fuel, the spiral plate can guide and throttle the airflow, effectively reducing the flow velocity of fuel and gas mixture, enhancing flame stability, and prolonging the residence time of high-temperature flue gas in the combustion chamber, thereby improving combustion efficiency. The combustion assembly includes a spiral plate disposed inside one end of the combustion chamber, with an ignition assembly penetrating the combustion chamber at the top of the spiral plate, and a fuel nozzle penetrating the combustion chamber at the end of the spiral plate near the combustion assembly. Several air inlets are opened at one end of the combustion chamber, and a fuel tank is disposed on one side of the air inlets and at the end of the fuel nozzle. A fan is disposed at the end of the fuel tank away from the fuel nozzle. The air inlets are evenly arranged and circumferentially distributed at one end of the combustion chamber.

[0008] Furthermore, to achieve heat recovery from the flue gas, the flow path of the flue gas is effectively extended by the obstruction effect of the baffles. The baffles not only participate in heat exchange but also reduce the flue gas velocity through their structural design, preventing it from directly entering the inert gas outlet pipe, thereby extending the residence time of the flue gas in the cooling zone. The inclined arrangement of the baffles, their spiral structure, and the synergistic effect of the through holes guide the sprayed washing water to form a multi-stage flow path, enhancing water-air contact and improving washing and cooling efficiency. The cooling assembly includes a connecting pipe located at the other end of the combustion chamber. A first water inlet pipe is installed at the bottom of the connecting pipe away from the combustion assembly. A spiral tube is installed at one end of the first water inlet pipe and inside the connecting pipe. The top of the spiral tube is connected to a liquid outlet pipe. A heat-conducting plate is connected to the outside of the spiral tube, and a baffle plate is connected to the inside of the spiral tube. Several through holes are opened at the top of the baffle plate. The heat-conducting plate has a spiral structure, and the bottom surface of the heat-conducting plate and the bottom surface of the spiral tube form an acute angle. The baffle plate has a spiral structure, and the width of the baffle plate is greater than the width of the heat-conducting plate. Several through holes are evenly arranged and spirally distributed at the top of the baffle plate.

[0009] Furthermore, in order to achieve the washing and cooling of flue gas, the flue gas can be directly washed and cooled by the downward spraying action of the nozzles to remove impurities such as soot and sulfides from the flue gas and reduce the flue gas temperature, ensuring that the output inert gas meets the safety filling requirements of the ship's cargo oil tanks. The inert gas outlet assembly includes: an inert gas outlet pipe, located at the top of the cooling assembly; a second water inlet pipe, which runs through and is located inside one side of the inert gas outlet pipe; a nozzle, located at the bottom of the second water inlet pipe; and a demister plate, located at the top of the second water inlet pipe and inside the inert gas outlet pipe.

[0010] Furthermore, to prevent the accumulation of water in the inert gas generator, the water level in the measuring tube can be automatically monitored by a water level sensor, and wastewater can be discharged through a drain pipe to prevent overflow and ensure continuous and reliable operation of the generator. The drainage component includes: a measuring tube, located at the bottom of the cooling component; a water level sensor, located at the top inside the measuring tube; and a drain pipe, which runs through the bottom of the measuring tube.

[0011] The beneficial effects of this utility model are as follows: 1. This utility model, through the coordinated arrangement of a combustion chamber, combustion components, cooling components, inert gas outlet components, drainage components, support blocks, and control panel, can not only efficiently and continuously generate inert gas for the safety of ship cargo oil tanks, but also has the functions of flue gas cooling and waste heat recovery. While efficiently reducing the flue gas temperature, it can also heat domestic water, thereby improving energy utilization efficiency.

[0012] 2. Through the cooling components, the flow path of the flue gas is effectively extended by the obstruction of the baffle. The baffle not only participates in heat exchange, but also reduces the flue gas velocity through its structural design, preventing it from directly entering the inert gas outlet pipe, thereby extending the residence time of the flue gas in the cooling zone. Furthermore, the inclined arrangement of the baffle, the spiral structure of the baffle, and the synergistic effect of the through holes guide the sprayed washing water to form a multi-stage flow path, enhancing water-air contact and improving washing and cooling efficiency.

[0013] 3. The spiral plate can guide and throttle the airflow, effectively reducing the flow velocity of fuel and gas mixture, enhancing flame stability, and prolonging the residence time of high-temperature flue gas in the combustion chamber, thereby improving combustion efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a direct-fired marine inert gas generator according to an embodiment of the present utility model; Figure 2 This is one of the cross-sectional views of a direct-fired marine inert gas generator according to an embodiment of the present utility model; Figure 3 This is a second cross-sectional view of a direct-fired marine inert gas generator according to an embodiment of the present utility model; Figure 4This is one of the partial cross-sectional views of a direct-fired marine inert gas generator according to an embodiment of the present utility model; Figure 5 This is a second partial cross-sectional view of a direct-fired marine inert gas generator according to an embodiment of the present utility model; Figure 6 This is one of the partial schematic diagrams of the cooling component in a direct-fired marine inert gas generator according to an embodiment of the present utility model; Figure 7 This is a second partial schematic diagram of the cooling component in a direct-fired marine inert gas generator according to an embodiment of the present invention.

[0016] In the picture: 1. Combustion chamber; 2. Combustion assembly; 201. Spiral plate; 202. Ignition assembly; 203. Fuel nozzle; 204. Air inlet; 205. Fuel tank; 206. Fan; 3. Cooling assembly; 301. Connecting pipe; 302. First water inlet pipe; 303. Spiral tube; 304. Liquid outlet pipe; 305. Heat-conducting plate; 306. Baffle plate; 307. Through hole; 4. Inert gas outlet assembly; 401. Inert gas outlet pipe; 402. Second water inlet pipe; 403. Nozzle; 404. Demisting plate; 5. Drainage assembly; 501. Measuring tube; 502. Water level sensor; 503. Drainage pipe; 6. Support block; 7. Control panel. Detailed Implementation

[0017] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0018] According to an embodiment of the present invention, a direct-fired marine inert gas generator is provided.

[0019] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-7 As shown, the direct-fired marine inert gas generator according to an embodiment of the present invention includes: a combustion chamber 1; a combustion assembly 2 disposed inside one end of the combustion chamber 1; a cooling assembly 3 disposed at the other end of the combustion chamber 1 and used to recover the heat generated by the direct-fired marine inert gas generator; an inert gas outlet assembly 4 disposed at the top of the cooling assembly 3; a drainage assembly 5 disposed at the bottom of the cooling assembly 3; a support block 6 disposed at the bottom of the combustion chamber 1 near the combustion assembly 2; and a control panel 7 disposed on the outside of the combustion chamber 1.

[0020] In one embodiment, the combustion assembly 2 includes a spiral plate 201 disposed inside one end of the combustion chamber 1. An ignition assembly 202 penetrating the combustion chamber 1 is disposed at the top of the spiral plate 201. A fuel nozzle 203 penetrating the combustion chamber 1 is disposed at the end of the spiral plate 201 near the combustion assembly 2. A plurality of air inlets 204 are provided at one end of the combustion chamber 1. A fuel tank 205 is disposed on one side of the air inlets 204 and at the end of the fuel nozzle 203. A fan 206 is disposed at the end of the fuel tank 205 away from the fuel nozzle 203. The air inlets 204 are evenly arranged and circumferentially distributed at one end of the combustion chamber 1. The spiral plate 201 can guide and throttle the airflow, effectively reducing the flow velocity of fuel and gas mixture, enhancing flame stability, and prolonging the residence time of high-temperature flue gas in the combustion chamber, thereby improving combustion efficiency.

[0021] In one embodiment, the cooling assembly 3 includes a connecting pipe 301 disposed at the other end of the combustion chamber 1. A first water inlet pipe 302 is disposed through the bottom of the end of the connecting pipe 301 away from the combustion assembly 2. A spiral tube 303 is disposed at one end of the first water inlet pipe 302 and inside the connecting pipe 301. A liquid outlet pipe 304 is connected to the top end of the spiral tube 303. A heat-conducting plate 305 is connected to the outside of the spiral tube 303, and a baffle plate 306 is connected to the inside of the spiral tube 303. A plurality of through holes 307 are opened at the top end of the baffle plate 306. The heat-conducting plate 305 has a spiral structure, and the bottom surface of the heat-conducting plate 305 and the bottom surface of the spiral tube 303 form an acute angle. The baffle plate 306 has a spiral structure, and its width is greater than that of the heat-conducting plate 305. Several through holes 307 are evenly arranged and spirally distributed at the top of the baffle plate 306. Under the blocking effect of the baffle plate 306, the flow path of the flue gas is effectively extended. The baffle plate 306 not only participates in heat exchange, but also reduces the flue gas velocity through its structural design, preventing it from directly entering the inert gas outlet pipe 401, thereby extending the residence time of the flue gas in the cooling zone. The inclined arrangement of the baffle plate 306, the spiral structure of the baffle plate 306, and the through holes 307 work together to guide the sprayed washing water to form a multi-stage flow path, enhance water-air contact, and improve washing and cooling efficiency.

[0022] In one embodiment, the inert gas outlet assembly 4 includes: an inert gas outlet pipe 401 disposed at the top of the cooling assembly 3; a second water inlet pipe 402, which passes through and is disposed inside one side of the inert gas outlet pipe 401; a nozzle 403 disposed at the bottom of the second water inlet pipe 402; and a demister plate 404 disposed at the top of the second water inlet pipe 402 and located inside the inert gas outlet pipe 401. Under the downward spraying action of the nozzle 403, the flue gas can be directly washed and cooled to remove impurities such as soot and sulfides from the flue gas and reduce the flue gas temperature, ensuring that the output inert gas meets the safety filling requirements of the ship's cargo oil tanks.

[0023] In one embodiment, the drainage assembly 5 includes: a measuring tube 501 disposed at the bottom of the cooling assembly 3; a water level sensor 502 disposed at the top inner part of the measuring tube 501; and a drain pipe 503 disposed through the bottom of the measuring tube 501. Under the action of the water level sensor 502, the water level in the measuring tube 501 can be automatically monitored, and wastewater can be discharged through the drain pipe 503 to prevent overflow and ensure continuous and reliable operation of the generator.

[0024] In addition, it should be noted that the aforementioned fan 206 consists of a fan casing, a motor and an impeller. By starting the motor, the impeller is driven to rotate, which allows the fan to introduce air into the combustion chamber 1 to achieve fuel combustion. This fan is existing technology and will not be elaborated on further here.

[0025] In addition, it should be noted that both the first water inlet pipe 302 and the second water inlet pipe 402 are supplied with water by a water inlet pump. This water inlet pump is existing technology and will not be elaborated on here.

[0026] In addition, it should be noted that the above-mentioned drain pipe 503 is connected to a drain pump to realize drainage. This drain pump is existing technology and will not be elaborated on here.

[0027] In addition, it should be noted that the control panel 7 consists of a human-machine interface (HMI) and a programmable logic control panel (PLC), and the control panel 7 is electrically connected to the combustion assembly 2, the water pump, and the drainage assembly 5; the control panel 7 is prior art, and will not be elaborated on further here.

[0028] In addition, it should be noted that the ignition component 202 mentioned above can be used as an ignition gun in specific applications. The ignition gun can be composed of an ignition electrode and a high-voltage cable. The working principle of the ignition gun is to generate an electric spark through high-voltage discharge, which ignites the mixture of fuel and air sprayed from the fuel nozzle 203, thereby starting the combustion process.

[0029] In addition, it should be noted that the fuel tank 205 is equipped with a fuel pump, which delivers the fuel in the fuel tank 205 into the fuel nozzle 203. The fuel can be light diesel oil, marine distillate oil or other clean liquid fuels suitable for marine combustion equipment. The fuel pump is existing technology and will not be elaborated on here.

[0030] In addition, it should be noted that the medium introduced into the second water inlet pipe 402 can be seawater or fresh water, which is used to wash the flue gas generated by combustion to remove impurities such as soot and sulfides from the flue gas, and to reduce the flue gas temperature, so as to ensure that the output inert gas meets the safety filling requirements of the ship's cargo oil tanks.

[0031] In addition, it should be noted that the medium introduced into the first water inlet pipe 302 can be domestic fresh water or water from the ship's fresh water supply system. It flows through the spiral tube 303 in the cooling component 3 and is heated by heat conduction with the high-temperature flue gas to achieve waste heat recovery and utilization. The heated hot water can be supplied to the ship's living system, such as for bathing and kitchen, thereby improving energy utilization efficiency.

[0032] In addition, it should be noted that the spiral tube 303, the baffle 306 and the heat-conducting plate 305 mentioned above are all metal materials with high thermal conductivity, specifically stainless steel, titanium alloy or copper-nickel alloy; used to absorb heat from flue gas.

[0033] Furthermore, it should be noted that the aforementioned demister plate 404 is used to remove excess moisture carried by inert gas. The demister plate 404 can adopt a labyrinthine or corrugated plate structure and is made of corrosion-resistant materials. In specific applications, it can be stainless steel, polypropylene, or fiberglass. When the wet inert gas passes through the narrow and tortuous channel, the water mist condenses into droplets under the action of inertial collision, interception, and gravity and flows down along the plate surface, thereby achieving gas-liquid separation and ensuring that the moisture content of the output inert gas meets the requirements of ship safety regulations. The demister plate 404 is existing technology and will not be elaborated on further here.

[0034] Furthermore, it should be noted that the aforementioned water level sensor 502 is a radar water level sensor, suitable for humid and dusty marine environments. This sensor transmits the detected water level signal to the control panel 7 in real time. The control panel 7 performs logical judgment and automatic control based on preset water level thresholds. When the water level is detected to reach or exceed the preset high water level, the control panel 7 starts or increases the operating power of the drainage pump to accelerate the drainage speed. When the water level is detected to drop to the preset low water level, the control panel 7 shuts off the drainage pump to prevent damage from idling. At the same time, if the water level continues to rise and approaches the high limit alarm value, the control panel 7 can also adjust the operating frequency of the water inlet pump on the second water inlet pipe 402 to appropriately reduce the amount of washing water entering the system, achieving a balance between water intake and drainage and preventing overflow.

[0035] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0036] In practical applications, the fan 206, fuel pump, and ignition assembly 202 are activated via the control panel 7, causing the ignition assembly 202 to ignite the fuel-air mixture ejected from the fuel nozzle 203, thus initiating the combustion process. During combustion, the air entering the system is guided to form a swirling aerodynamic field by the synergistic action of several air inlets 204 and the spiral plate 201, promoting thorough mixing of air and fuel. Simultaneously, the spiral plate 201 guides and throttles the airflow, effectively reducing the flow velocity of fuel and mixture, enhancing flame stability, and extending the residence time of high-temperature flue gas in the combustion chamber, thereby improving combustion efficiency and effectively suppressing the generation of nitrogen oxides. At the same time, the water pump is activated via the control panel 7, sending domestic freshwater or water from the ship's freshwater supply system into the spiral tube 303 within the cooling assembly 3 through the first water inlet pipe 302, achieving indirect cooling and waste heat recovery of the high-temperature flue gas. Meanwhile, seawater or freshwater is sent into the washing zone through the second water inlet pipe 402 and sprayed downwards through the nozzles 403 to directly wash and cool the flue gas. During the cooling and washing process, the flue gas flows through the baffle 306, effectively extending its flow path. The baffle 306 not only participates in heat exchange but also reduces the flue gas velocity through its structural design, preventing it from directly entering the inert gas outlet pipe 401, thereby extending the residence time of the flue gas in the cooling zone. The inclined arrangement of the baffle 306, its spiral structure, and the through holes 307 work together to guide the sprayed washing water to form a multi-stage flow path, enhancing water-air contact and improving washing and cooling efficiency. After cooling, the wastewater collects and flows into the measuring pipe 501, where the water level sensor 502 is activated. The detected water level signal is transmitted to the control panel 7, which controls the drainage pump to drain water, which is discharged through the drainage pipe 503. At the same time, the cooled inert gas passes through the demister plate 404 to remove excess moisture carried by the inert gas. The dry inert gas is output through the inert gas outlet pipe 401 and delivered to the ship's cargo oil tank. The inert gas accumulates in the cargo oil tank, forming a positive pressure inert atmosphere, which effectively replaces the air in the tank and reduces the oxygen concentration to a safe level. This prevents cargo oil vapor from mixing with air to form a flammable environment, ensuring the inherent safety of the ship during loading, unloading, and navigation.

[0037] In summary, by utilizing the above-mentioned technical solution of this utility model, through the coordinated arrangement of the combustion chamber 1, combustion assembly 2, cooling assembly 3, inert gas outlet assembly 4, drainage assembly 5, support block 6, and control panel 7, not only can inert gas for the safety of ship cargo oil tanks be generated efficiently and continuously, but it can also have the functions of flue gas cooling and waste heat recovery. While efficiently reducing the flue gas temperature, it can also heat domestic water, improving energy utilization efficiency. Through the cooling assembly 3, the flue gas flow path is effectively extended under the obstruction of the baffle 306. The baffle 306 not only participates in heat exchange, Furthermore, its structural design reduces the flue gas velocity, preventing it from directly entering the inert gas outlet pipe 401, thereby extending the residence time of the flue gas in the cooling zone. The inclined arrangement of the baffle 306, the spiral structure of the baffle 306, and the through hole 307 work together to guide the sprayed washing water to form a multi-stage flow path, enhancing water-air contact and improving washing and cooling efficiency. Through the spiral plate 201, the airflow can be guided and throttled, effectively reducing the flow velocity of fuel and gas mixture, enhancing flame stability, and extending the residence time of high-temperature flue gas in the combustion chamber, thereby improving combustion efficiency.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A direct-fired marine inert gas generator, characterized in that, include: Combustion chamber (1); Combustion assembly (2) is disposed inside one end of combustion chamber (1); A cooling assembly (3) is located at the other end of the combustion chamber (1) and is used to recover the heat generated by the direct-fired marine inert gas generator. An inert gas outlet assembly (4) is disposed at the top of the cooling assembly (3); A drainage component (5) is disposed at the bottom end of the cooling component (3); A support block (6) is disposed at the bottom end of the combustion chamber (1) near the combustion assembly (2); The control panel (7) is located on the outside of the combustion chamber (1).

2. A direct-fired marine inert gas generator according to claim 1, characterized in that, The combustion assembly (2) includes a spiral plate (201) disposed inside one end of the combustion chamber (1), an ignition assembly (202) that penetrates the combustion chamber (1) is disposed at the top of the spiral plate (201), and a fuel nozzle (203) that penetrates the combustion chamber (1) is disposed at one end of the spiral plate (201) near the combustion assembly (2). The combustion chamber (1) has a plurality of air inlets (204) at one end, and a fuel tank (205) is provided on one side of the plurality of air inlets (204) and at one end of the fuel injector (203). A fan (206) is provided at the end of the fuel tank (205) away from the fuel injector (203).

3. A direct-fired marine inert gas generator according to claim 1, characterized in that, The cooling assembly (3) includes a connecting pipe (301) disposed at the other end of the combustion chamber (1). A first water inlet pipe (302) is provided through the bottom of the end of the connecting pipe (301) away from the combustion assembly (2). A spiral pipe (303) is provided at one end of the first water inlet pipe (302) and inside the connecting pipe (301). A liquid outlet pipe (304) is connected to the top end of the spiral pipe (303). A heat-conducting plate (305) is connected to the outside of the spiral tube (303), and a baffle plate (306) is connected to the inside of the spiral tube (303). Several through holes (307) are opened at the top of the baffle plate (306).

4. A direct-fired marine inert gas generator according to claim 1, characterized in that, The inert gas outlet assembly (4) includes: An inert gas outlet pipe (401) is disposed at the top of the cooling assembly (3); The second water inlet pipe (402) is installed inside one side of the inert gas outlet pipe (401); The nozzle (403) is located at the bottom end of the second water inlet pipe (402); The demister plate (404) is disposed at the top of the second water inlet pipe (402) and located inside the inert gas outlet pipe (401).

5. A direct-fired marine inert gas generator according to claim 1, characterized in that, The drainage assembly (5) includes: A measuring tube (501) is disposed at the bottom end of the cooling assembly (3); A water level sensor (502) is disposed at the inner top of the measuring tube (501); A drain pipe (503) is installed through the bottom of the measuring pipe (501).

6. A direct-fired marine inert gas generator according to claim 2, characterized in that, The intake holes (204) are evenly arranged and circumferentially distributed at one end of the combustion chamber (1).

7. A direct-fired marine inert gas generator according to claim 3, characterized in that, The heat-conducting plate (305) has a spiral structure, and the bottom surface of the heat-conducting plate (305) and the bottom surface of the spiral tube (303) form an acute angle.

8. A direct-fired marine inert gas generator according to claim 3, characterized in that, The spoiler (306) has a spiral structure, and the width of the spoiler (306) is greater than the width of the heat-conducting plate (305).

9. A direct-fired marine inert gas generator according to claim 3, characterized in that, The through holes (307) are evenly arranged and spirally distributed at the top of the spoiler (306).

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