Novel natural gas gasifier tail gas collection and treatment system

Abstract

The invention discloses a novel natural gas gasifier tail gas collection and treatment system, and belongs to the technical field of gasifier tail gas treatment. A novel natural gas gasifier tail gas collection and treatment system comprises a waste gas collection and replacement system and a waste gas conveying and resource utilization treatment system. Dispersed waste gas source points (a plurality of sedimentation tanks and an underground water tank) are collected, conveyed and treated in a centralized mode, a complete safety control system comprising an anti-explosion fan, a flame arrester, an oxygen content online monitor and the like is arranged, a complete, reliable and efficient closed-loop technological process is formed, a controller, an inductor and an ignition device are matched for linkage ignition, and the safety of the waste gas source points is improved. A fire retardant plate and a one-way valve are used for preventing backfire, a pressure detection device and a pressure regulating valve are used for interlocking protection, an auxiliary fuel pipe and a sealing strip are combined for sealing and leakage prevention, an ultraviolet flame detector and observation glass are used for monitoring flames, and potential safety hazards are prevented; waste gas recycling is achieved, benefits are improved, and safe operation of the device is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of gasifier tail gas treatment technology, and in particular to a novel natural gas gasifier tail gas collection and treatment system. Background Technology

[0002] Currently, the production of acetylene from natural gas is relatively rare in China, with most methods using partial oxidation. This process generates wastewater and waste gas that are discharged irregularly after the production of acetylene and byproducts. As the country imposes increasingly stringent environmental protection requirements on chemical enterprises, the partial oxidation of natural gas is now required to centrally collect and treat wastewater and waste gas. Therefore, existing operating facilities need to consider comprehensive wastewater and waste gas treatment to reduce environmental pollution.

[0003] When the existing natural gas gasification furnace tail gas collection and treatment system is in use: after the natural gas is partially oxidized and cracked, it is quenched and cooled by water and washed. Some of the cracked gas dissolves in the quenching water and is carried into the black water return water along with the black water produced during the reaction. After entering the black water separation tank, it is separated out, causing frequent GDS alarms in the unit area and posing safety hazards to the unit system. During use, there is no device for centralized recovery and treatment of waste gas. The generated waste gas is directly discharged or simply incinerated, and resource recovery cannot be achieved, resulting in energy waste.

[0004] Therefore, a novel natural gas gasification furnace tail gas collection and treatment system is provided to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to solve the problems mentioned in the background art and to propose a novel natural gas gasification furnace tail gas collection and treatment system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A novel natural gas gasification furnace tail gas collection and treatment system includes a waste gas collection and replacement system comprising a gas collection hood installed above an open-air black water settling tank to collect the desorption waste gas generated from multiple settling tanks into a VOCs collection manifold; for an underground closed black water circulating tank, inert gas is continuously introduced into its top space to prevent the accumulation of combustible gases; through continuous purging, combustible gases that may leak or dissolve and then desorb are replaced and incorporated into the aforementioned waste gas manifold.

[0007] The waste gas transportation and resource utilization treatment system includes a gas-liquid separator installed on the pipeline before the waste gas enters the fan to separate and remove liquid droplets entrained in the waste gas. The fan outlet pipeline is equipped with a flashback arrestor (flame arrestor) with a fire resistance rating of IIC (for dangerous gases such as acetylene and hydrogen). The pretreated waste gas is transported to the tail gas treatment furnace for combustion as supplementary fuel.

[0008] For unified collection, transportation, and centralized processing, preferably, the exhaust gas treatment furnace has a combustion chamber, a sensor installed on the inner wall of the combustion chamber, an ignition device installed on the inner wall of the combustion chamber, a controller installed on the exhaust gas treatment furnace, the controller being used to control the ignition device, a flame arrestor plate installed inside the combustion chamber, a gas collection chamber separated from the combustion chamber by the flame arrestor plate, a connecting port opened on the gas collection chamber, an exhaust gas inlet pipe installed on the connecting port, and a safety valve installed on the top of the exhaust gas treatment furnace.

[0009] To stabilize the combustion chamber temperature, preferably, a heat insulation plate is installed inside the combustion chamber, and multiple flow guide holes are evenly formed on the heat insulation plate, with a heat insulation cavity formed inside the heat insulation plate.

[0010] To enhance the safety of ignition control, preferably, an isolation chamber is provided inside the exhaust gas treatment furnace. An ignition switch is installed in the isolation chamber between the controller and the sensor. The ignition switch is electrically connected to the controller. When the sensor detects that the combustion chamber temperature has reached a specified temperature, the controller triggers the ignition switch to start the ignition device. An igniter is installed on the ignition device.

[0011] To achieve auxiliary fuel regulation and monitor the pressure in the gas collecting chamber, preferably, an auxiliary fuel pipe is installed on the tail gas treatment furnace. The auxiliary fuel pipe is connected to the gas collecting chamber through a connecting port on the tail gas treatment furnace. A control valve is installed at the connection between the auxiliary fuel pipe and the gas collecting chamber. An installation groove one is opened at the bottom of the auxiliary fuel pipe, and a sealing strip is installed in the installation groove one. An installation groove two is opened on the inner wall of the gas collecting chamber at the connection between the auxiliary fuel pipe and the gas collecting chamber, and a pressure detection device is installed in the installation groove two.

[0012] To ensure continuous and stable combustion, preferably, the auxiliary fuel pipe is connected to the main fuel tank, and automatically switches to the main fuel tank when the exhaust gas supply is unstable.

[0013] To monitor the flame status, preferably, the exhaust gas treatment furnace is provided with a flame detection port, an ultraviolet flame detector is installed on the flame detection port, and an observation glass is installed on the ultraviolet flame detector.

[0014] Compared with existing technologies, this invention provides a novel natural gas gasification furnace tail gas collection and treatment system, which has the following beneficial effects: by unifying the collection, transportation and centralized treatment of dispersed waste gas sources (multiple settling tanks, underground water tanks), and equipping it with a complete safety control system including explosion-proof fans, flame arresters, and online oxygen content monitoring, a complete, reliable and efficient closed-loop process is formed. This is achieved through the coordinated ignition of the controller, sensors, and ignition device; the flame arrester and one-way valve prevent backfire; the pressure detection device and pressure regulating valve are interlocked for protection; the auxiliary fuel pipe and sealing strip prevent leakage; and the ultraviolet flame detector and observation glass monitor the flame to prevent safety hazards. This system enables waste gas recovery and utilization, improves efficiency and ensures the safe operation of the equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure proposed in this invention; Figure 2 The cross-section proposed in this invention Figure 1 ; Figure 3 The cross-section proposed in this invention Figure 2 ; Figure 4 The cross-section proposed in this invention Figure 3 ; Figure 5 The cross-section proposed in this invention Figure 1 Part A; Figure 6 The cross-section proposed in this invention Figure 1 Part B; Figure 7 The cross-section proposed in this invention Figure 2 Part C; Figure 8 The cross-section proposed in this invention Figure 3 Part D.

[0016] In the diagram: 1. Exhaust gas treatment furnace; 101. Exhaust gas inlet pipe; 102. Auxiliary fuel pipe; 1021. Mounting slot one; 1022. Sealing strip; 103. Controller; 104. Isolation chamber; 105. Heat insulation plate; 1051. Guide hole; 1052. Heat insulation chamber; 106. Control valve; 107. Mounting slot two; 1071. Pressure detection device; 108. Safety valve; 2. Sensor; 201. Ignition switch; 3. Ignition device; 301. Ignition head; 4. Combustion chamber; 5. Flame arrestor plate; 501. Flow chamber; 502. One-way valve; 6. Gas collection chamber; 8. Observation glass. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] Example 1: Reference Figure 1-8 A novel natural gas gasification furnace tail gas collection and treatment system includes waste gas collection from a settling tank. During collection, a gas collection hood is installed above the open-air black water settling tank. The hood is made of fiberglass reinforced plastic (FRP) or reinforced polypropylene (PP), possessing both corrosion resistance, weather resistance, and sufficient structural strength. The edge of the hood is softly sealed to the settling tank wall using oil-resistant and corrosion-resistant rubber or silicone sealing strips. The desorption waste gas from multiple settling tanks (typically 3-5 series) is collected into a single VOCs (Volatile Oxide Gas Collector) main pipe. The diameter of the VOCs main pipe is based on a total gas volume of 6000-10000 Nm³ / h and a flow velocity of 10-15 m / s; a recommended pipe diameter is DN400-DN500. The pipe has a slope of at least 0.5% towards the blower, and a condensate discharge port is installed at the lowest point. The edges of the hood and the tank body are sealed with corrosion-resistant soft sealing materials to ensure airtightness. Key process parameters are as follows: 1. Single-series exhaust gas volume: approximately 2000 Nm³ / h; 2. Gas flow rate in the main collection pipe: approximately 6000-10000 Nm³ / h (calculated based on 3-5 series); 3. Slight negative pressure inside the gas collection hood: The control range is from -50 to -100 Pa to ensure that the exhaust gas can be effectively drawn in, while avoiding excessive suction that may affect the normal operation of the sedimentation tank; 4. Pipe Material: It is recommended to use fiberglass (FRP) or UPVC to resist the corrosive components in black water exhaust gas.

[0019] When the gas in a closed water tank is replaced: For underground closed black water circulation tanks, to prevent the accumulation of combustible gases, an inert gas (such as nitrogen) is continuously introduced into the top space. Through continuous purging, combustible gases (such as acetylene, CO, etc.) that may leak or dissolve and then decompose are replaced and connected to the above-mentioned exhaust gas main pipe. The key process parameters are as follows: 1. Inert gas flow rate: Based on the volume of the water tank, maintain the replacement flow rate at 50-150 Nm³ / h; 2. Oxygen concentration monitoring: An online oxygen analyzer is installed at the exhaust port at the top of the pool to ensure that the oxygen content in the gas after replacement is less than 2% (vol), thereby fundamentally eliminating the risk of backfire and explosion.

[0020] The oxygen analyzer is installed on the exhaust pipe at the top of the black water circulating pool, with a measurement range of 0~25%vol; the alarm value is set to oxygen content >2%, and it can be interlocked with audible and visual alarms, and even increase the nitrogen purging volume; the explosion-proof rating is at least ExdIICT4Gb, and it is suitable for acetylene hazardous environments.

[0021] Before entering the incinerator, the collected waste gas needs to undergo flow stabilization and preliminary safety treatment. A gas-liquid separator is installed on the pipeline before the waste gas enters the exhaust gas fan to separate and remove liquid droplets entrained in the waste gas. The exhaust gas fan outlet pipeline is equipped with a flashback arrestor (flame arrestor) with a fire resistance rating of IIC (for hazardous gases such as acetylene and hydrogen). Pressure detection points are also installed at the fan inlet or after the separator. Key process parameters are as follows: 1. Blower pressurization: The outlet pressure is increased to ~10kPa(G) to overcome the resistance of the subsequent pipelines and incinerator head; 2. Safety Interlock: A low-pressure interlock is set up so that when the system pressure is lower than 10 kPa(G), the fuel supply is automatically cut off to prevent backfire; 3. Gas temperature: The gas temperature before entering the fan is below 80°C to protect the fan and prevent the gas from overheating.

[0022] The exhaust fan type is an explosion-proof centrifugal fan with an explosion-proof rating of ExdIICT4 (due to the presence of acetylene and hydrogen in the medium). The design flow rate is ~8000 Nm³ / h (the maximum capacity of 15000 Nm³ / h can be selected with a margin). The total pressure is ≥12 kPa (to overcome pipeline and equipment resistance and ensure sufficient pressure at the furnace head). The materials used for the flow parts in contact with the medium (impeller, casing) are stainless steel 304 or 316L.

[0023] The gas-liquid separator is vertical and equipped with a wire mesh demister made of carbon steel lined with plastic or 316L stainless steel. It is designed for atmospheric pressure and a temperature of ~120℃. The top is the exhaust gas outlet, the side is the exhaust gas inlet, and the bottom is equipped with a level gauge and a condensate drain valve.

[0024] The flame arrester is rated IIC (for hydrogen and acetylene). It is installed on the blower outlet pipe and is made of carbon steel for the shell and 316L stainless steel for the flame arrestor core.

[0025] End-of-pipe incineration and resource utilization: This involves the harmless treatment and resource utilization of waste gas. The pretreated waste gas is transported to tail gas treatment furnace 1 as supplementary fuel for combustion. To ensure stable combustion, an automatic pressure regulation system is installed at the inlet of tail gas treatment furnace 1, and the amount of combustion air is adjusted according to the calorific value of the waste gas. The key process parameters are as follows: 1. The calorific value of the exhaust gas is approximately 13,944 kcal / Nm³ (equivalent to ~16.2 MJ / Nm³), which has good recycling value; 2. Combustion temperature: The temperature inside the exhaust gas treatment furnace 1 must be higher than 850℃ to ensure complete decomposition of harmful substances; 3. Air distribution control: Adjust the amount of combustion air in real time according to the exhaust gas flow and composition to control the oxygen content of the flue gas at 3%-6%, ensuring combustion efficiency while reducing heat loss.

[0026] The exhaust gas treatment furnace 1 has a combustion chamber 4 inside, providing space for the combustion of exhaust gas. A sensor 2 is installed on the inner wall of the combustion chamber 4 to monitor the temperature inside. An ignition device 3 is also installed on the inner wall of the combustion chamber 4 to ignite the exhaust gas entering the combustion chamber 4. A controller 103 is installed on the exhaust gas treatment furnace 1, electrically connected to the sensor 2 and the ignition device 3, to control the start and stop of the ignition device 3. A flame arrestor plate 5 is installed inside the combustion chamber 4 to prevent backfire during combustion. The flame arrestor plate 5 has a fire resistance rating of IIC and multiple flow chambers 501 are evenly distributed on it. A one-way valve 502 is installed inside the flow chamber 501. The one-way valve 502 only allows the exhaust gas in the gas collection chamber 6 to flow unidirectionally to the combustion chamber 4, further enhancing the backfire prevention effect and ensuring that the exhaust gas smoothly enters the combustion zone. The combustion chamber 4 is separated from the combustion chamber 4 by the flame arrestor plate 5, and the gas collection chamber 6 is used to store the pre-treated exhaust gas to be burned. A connecting port is opened on the gas collection chamber 6, and an exhaust gas inlet pipe 101 is installed on the connecting port. The exhaust gas inlet pipe 101 is used to connect the exhaust gas collected and replaced at the front end. A safety valve 108 is installed on the top of the exhaust gas treatment furnace 1. The safety valve 108 is used to ensure the system pressure safety. An auxiliary fuel pipe 1 is installed on the exhaust gas treatment furnace 1. 02. The auxiliary fuel pipe 102 is connected to the gas collecting chamber 6 through a connecting port to supplement fuel and maintain stable combustion. A mounting groove 1021 is provided at the bottom of the auxiliary fuel pipe 102, and a sealing strip 1022 is installed in the mounting groove 1021 to enhance the sealing at the connection between the auxiliary fuel pipe 102 and the gas collecting chamber 6. A mounting groove 107 is provided on the inner wall of the gas collecting chamber 6 at the connection between the auxiliary fuel pipe 102 and the gas collecting chamber 6, and a pressure detection device 1071 is installed in the mounting groove 107 to monitor the pressure inside the gas collecting chamber 6 in real time. An isolation chamber 1 is provided inside the tail gas treatment furnace 1. 04; An ignition switch 201 is installed inside the isolation chamber 104. The ignition switch 201 is electrically connected to the controller 103 and the ignition device 3. An igniter 301 is installed on the ignition device 3. A control valve 106 is installed at the connection between the auxiliary fuel pipe 102 and the gas collection chamber 6. The control valve 106 is electrically connected to the controller 103 and is used to control the supply of auxiliary fuel. A flame detection port is opened on the exhaust gas treatment furnace 1. An ultraviolet flame detector (not shown in the figure) is installed on the flame detection port. The ultraviolet flame detector is used to monitor the flame status in the combustion chamber 4. An observation glass 8 is installed on the ultraviolet flame detector for visual observation of the combustion situation.

[0027] During installation, first, fix the flame arrestor plate 5 inside the exhaust gas treatment furnace 1. Then, embed a one-way valve 502 into the flow cavity 501 of the flame arrestor plate 5, ensuring that the flow direction of the one-way valve 502 faces the combustion chamber 4. Next, seal the flame arrestor plate 5 against the inner wall of the furnace, dividing the combustion chamber 4 into a gas collection chamber 6 and a combustion area. The sensor 2 and ignition device 3 are installed at corresponding positions on the inner wall of the combustion chamber 4, with the detection end of the sensor 2 facing the combustion area and the ignition end of the ignition device 3 facing the combustion area. The igniter 301 is fixed to the front end of the ignition device 3. An ignition switch 201 is installed inside the isolation chamber 104 and connected to the controller 103 and the ignition device 3 via wires. The controller 103 is fixed... Installed outside the exhaust gas treatment furnace 1, it is electrically connected to the sensor 2, ignition device 3, pressure detection device 1071, control valve 106, and ultraviolet flame detector via wires; the exhaust gas inlet pipe 101 is connected through the communication port of the gas collection chamber 6, and the pressure detection device 1071 is fixed in the second mounting slot 107, with the detection end of the pressure detection device 1071 in direct contact with the exhaust gas; the auxiliary fuel pipe 102 has a sealing strip 1022 embedded in the first mounting slot 1021 at the bottom, and the sealing strip 1022 is sealed and connected to the corresponding communication port of the gas collection chamber 6, and the control valve 106 is fixed on the auxiliary fuel pipe 102; a safety valve 108 is installed on the top of the exhaust gas treatment furnace 1, and the safety valve 108 is connected to the inside of the combustion chamber 4; the observation glass 8 and the ultraviolet flame detector are installed at the flame detection port.

[0028] During operation, the exhaust gas, after being collected, replaced, and pretreated at the front end, enters the gas collection chamber 6 through the exhaust gas inlet pipe 101. It then flows into the combustion chamber 4 in one direction through the flow chamber 501 of the flame arrestor plate 5 and the one-way valve 502. The sensor 2 monitors the temperature inside the combustion chamber 4 and transmits it to the controller 103. When the temperature reaches the ignition condition and the exhaust gas input is stable, the controller 103 triggers the ignition switch 201, and the igniter 301 generates a spark to ignite the exhaust gas. The safety valve 108 monitors the system pressure in real time, and the ultraviolet flame detector monitors the flame status, thus realizing the resource utilization of exhaust gas.

[0029] Example 2: Reference Figure 1-3 A novel natural gas gasifier tail gas collection and treatment system is basically the same as that in Embodiment 1, but with the following additional features: a heat insulation plate 105 is installed inside the combustion chamber 4. The heat insulation plate 105 is used to reduce heat loss in the combustion chamber 4 without affecting the exhaust gas from the exhaust end after combustion; multiple guide holes 1051 are evenly opened on the heat insulation plate 105 to allow the gas after combustion to pass smoothly and flow to the exhaust end; a heat insulation cavity 1052 is opened inside the heat insulation plate 105 to enhance the heat insulation effect; the heat insulation plate 105 is installed in the combustion chamber 4 near the exhaust end, located between the combustion area and the exhaust end, to avoid interference with the left exhaust pipe.

[0030] During installation, the heat insulation plate 105 is fixed to the inner wall of the combustion chamber 4 near the exhaust end, ensuring a tight seal with the inner wall and without obstructing the exhaust passage. The guide hole 1051 faces the exhaust end. During operation, the heat insulation plate 105 effectively reduces heat loss to the exhaust end. The combusted gas flows smoothly to the exhaust pipe through the guide hole 1051 and is discharged. Combined with the stable supply of exhaust gas at the front end, the backfire protection of the flame arrestor plate 5 and the one-way valve 502, the temperature inside the combustion chamber 4 is maintained above the specified temperature, ensuring the complete decomposition of harmful substances.

[0031] Example 3: Reference Figure 1-3 A novel natural gas gasification furnace tail gas collection and treatment system is basically the same as that in Example 1, but with the following additional features: a pressure detection device 1071 is installed on the inner wall of the gas collection chamber 6, which is used to detect the exhaust gas pressure in the gas collection chamber 6 in real time; the pressure detection device 1071 is electrically connected to the controller 103, and a pressure regulating valve is installed on the tail gas inlet pipe 101, which is electrically connected to the controller 103 to form a pressure regulating system.

[0032] During installation, the pressure detection device 1071 is fixed to the inner wall of the gas collection chamber 6, with the detection end in direct contact with the exhaust gas. The pressure regulating valve is installed on the exhaust gas inlet pipe 101 near the gas collection chamber 6 and connected to the controller 103 via a wire. During operation, the pressure detection device 1071 transmits pressure data to the controller 103 in real time. When the pressure is lower than the specified value, the controller 103 automatically activates the safety protection action, either adjusting the pressure regulating valve to increase the exhaust gas input and raise the pressure, or cutting off the fuel supply. Combined with the dual backfire prevention function of the flame arrestor 5 and the one-way valve 502, the risk of backfire is prevented.

[0033] Example 4: Reference Figure 1-8 A novel natural gas gasification furnace tail gas collection and treatment system is basically the same as that in Example 1, but with the following additional feature: the mounting groove 1021 at the bottom of the auxiliary fuel pipe 102 is adapted to the sealing strip 1022 to ensure the sealing of the connection and prevent leakage of exhaust gas or auxiliary fuel.

[0034] During installation, apply high-temperature resistant sealant to the sealing strip 1022 and embed it into the mounting groove 1021, ensuring that the sealing strip 1022 completely covers the inner wall of the mounting groove 1021. Then, connect the auxiliary fuel pipe 102 to the connection port of the gas collecting chamber 6 and tighten the flange to compress and deform the sealing strip 1022. During operation, the sealing strip 1022 effectively blocks gas leakage and ensures sealing performance.

[0035] Example 5: Reference Figure 1-3A novel natural gas gasification furnace tail gas collection and treatment system is basically the same as that in Example 1, but with a further improvement: the ultraviolet flame detector works in conjunction with the observation glass 8, the controller 103, and the control valve 106. When the detector detects that the flame in the combustion chamber 4 has been extinguished or that the combustion is unstable as observed through the observation glass 8, the ultraviolet flame detector sends a signal to the controller 103.

[0036] During installation, the detection end of the ultraviolet flame detector faces the combustion area and cooperates with the observation glass 8. The detector is connected to the controller 103 through wires. During operation, if the flame detector detects an abnormality, the controller 103 reacts by adjusting the control valve 106 to increase the auxiliary fuel supply and simultaneously controlling the ignition device 3 to re-ignite, ensuring continuous and stable combustion. The staff can observe the combustion status through the observation glass 8, with the safety protection of the flame arrestor plate 5 and the one-way valve 502.

[0037] Example 6: Reference Figure 1-8 A novel natural gas gasification furnace tail gas collection and treatment system is basically the same as that in Example 1, but with the following additional feature: the isolation chamber 104 is filled with insulating and heat-insulating material to enhance the protection of the ignition switch 201 and the wires, and to prevent the high-temperature environment from affecting the service life of electrical components.

[0038] By unifying the collection, transportation, and centralized treatment of dispersed waste gas sources (multiple settling tanks and underground water tanks), and equipping them with a complete safety control system including explosion-proof fans, flame arresters, and online oxygen content monitoring, a complete, reliable, and efficient closed-loop process is formed. This is achieved through the coordinated ignition of controller 103, sensor 2, and ignition device 3; backfire prevention via flame arrestor 5 and one-way valve 502; interlocking protection between pressure detection device 1071 and pressure regulating valve; leak-proof sealing via auxiliary fuel pipe 102 and sealing strip 1022; and flame monitoring via ultraviolet flame detector and observation glass 8, preventing potential safety hazards. This process enables waste gas recovery and utilization, improves efficiency, and ensures safe operation of the equipment.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A novel natural gas gasification furnace tail gas collection and treatment system, characterized in that, This includes waste gas collection and replacement systems and waste gas transportation and resource utilization treatment systems; The exhaust gas collection and replacement system includes a gas collection hood installed above the open-air black water settling tank, which collects the desorption exhaust gas generated by multiple settling tanks into a VOCs collection manifold; for the underground closed black water circulating tank, inert gas is continuously introduced into its top space to prevent the accumulation of combustible gas; through continuous purging, combustible gas that may leak or dissolve and then desorb is replaced and connected to the above-mentioned exhaust gas manifold. The waste gas transportation and resource utilization treatment system includes a gas-liquid separator installed on the pipeline before the waste gas enters the fan to separate and remove liquid droplets entrained in the waste gas. The fan outlet pipeline is equipped with a flashback arrestor with a fire resistance rating of IIC. The pretreated waste gas is transported to the tail gas treatment furnace (1) as supplementary fuel for combustion.

2. The novel natural gas gasification furnace tail gas collection and treatment system according to claim 1, characterized in that, The exhaust gas treatment furnace (1) has a combustion chamber (4) inside. A sensor (2) is installed on the inner wall of the combustion chamber (4). An ignition device (3) is installed on the inner wall of the combustion chamber (4). A controller (103) is installed on the exhaust gas treatment furnace (1). The controller (103) is used to control the ignition device (3). A flame arrestor plate (5) is installed inside the combustion chamber (4). The combustion chamber (4) is separated by the flame arrestor plate (5) into a gas collection chamber (6). A connecting port is opened on the gas collection chamber (6). An exhaust gas inlet pipe (101) is installed on the connecting port. A safety valve (108) is installed on the top of the exhaust gas treatment furnace (1).

3. The novel natural gas gasification furnace tail gas collection and treatment system according to claim 1, characterized in that, A heat insulation plate (105) is installed inside the combustion chamber (4). Multiple flow guide holes (1051) are evenly opened on the heat insulation plate (105), and a heat insulation cavity (1052) is opened inside the heat insulation plate (105).

4. The novel natural gas gasification furnace tail gas collection and treatment system according to claim 2, characterized in that, An isolation chamber (104) is provided inside the exhaust gas treatment furnace (1). An ignition switch (201) is installed in the isolation chamber (104) between the controller (103) and the sensor (2). The ignition switch (201) is electrically connected to the controller (103). When the sensor (2) detects that the temperature of the combustion chamber (4) reaches the specified temperature, the controller (103) triggers the ignition switch (201) to start the ignition device (3). An igniter (301) is installed on the ignition device (3).

5. A novel natural gas gasification furnace tail gas collection and treatment system according to claim 2, characterized in that, The fire arrestor plate (5) is provided with multiple flow chambers (501) evenly distributed, and a one-way valve (502) is installed in the flow chamber (501).

6. A novel natural gas gasification furnace tail gas collection and treatment system according to claim 2, characterized in that, An auxiliary fuel pipe (102) is installed on the tail gas treatment furnace (1). The auxiliary fuel pipe (102) is connected to the gas collection chamber (6) through a communication port opened on the tail gas treatment furnace (1). A control valve (106) is installed at the connection between the auxiliary fuel pipe (102) and the gas collection chamber (6).

7. A novel natural gas gasification furnace tail gas collection and treatment system according to claim 6, characterized in that, The auxiliary fuel pipe (102) has an installation groove (1021) at the bottom, and a sealing strip (1022) is installed in the installation groove (1021).

8. A novel natural gas gasification furnace tail gas collection and treatment system according to claim 6, characterized in that, The inner wall of the gas collecting chamber (6) is provided with an installation groove (107) at the connection between the auxiliary fuel pipe (102) and the gas collecting chamber (6), and a pressure detection device (1071) is installed in the installation groove (107).

9. A novel natural gas gasification furnace tail gas collection and treatment system according to claim 2, characterized in that, The auxiliary fuel pipe (102) is connected to the external main fuel tank and automatically switches to the main fuel function when the exhaust gas supply is unstable.

10. A novel natural gas gasification furnace tail gas collection and treatment system according to claim 6, characterized in that, The tail gas treatment furnace (1) is provided with a flame detection port, an ultraviolet flame detector is installed on the flame detection port, and an observation glass (8) is installed on the ultraviolet flame detector.

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