Toxic gas treatment system for vehicle fire scene

Abstract

The application provides a toxic gas treatment system for a vehicle fire scene, comprising: an air inlet unit for collecting and preliminarily filtering the air in the fire scene; a core treatment unit connected with the air inlet unit, the core treatment unit being used for multi-stage purification and physical treatment of the air; a water circulation unit connected with the core treatment unit, the water circulation unit being used for collecting, treating and recycling waste liquid generated by the system; and an air outlet unit connected with the core treatment unit, the air outlet unit being used for directional discharge of the purified air; wherein the core treatment unit comprises a first treatment section, a second treatment section and a terminal treatment section in sequence along the air flow direction. The application can effectively treat the toxic gas in the vehicle fire scene through continuous multi-stage treatment process by virtue of integrated, modular and targeted design.

Description

Technical Field

[0001] This invention relates to the field of fire protection, environmental protection and emergency rescue equipment technology, and in particular to a toxic gas treatment system for vehicle fire scenes. Background Technology

[0002] In existing technologies, conventional fire-fighting smoke extraction equipment and fixed industrial waste gas treatment devices have significant limitations in handling vehicle battery fires, mainly in the following four aspects: First, there is a lack of effective purification methods for the complex and highly toxic fumes released during battery thermal runaway. Lithium battery combustion produces mixed pollutants such as hydrogen fluoride (HF), hydrogen cyanide (HCN), carbon monoxide (CO), and heavy metal particles. These pollutants are complex in composition, highly toxic, and occur at high temperatures, making it difficult for existing single adsorption or ordinary ventilation technologies to achieve deep and comprehensive purification. Second, there is insufficient adaptability and mobility on-site. The fire scene environment changes rapidly, and fixed large-scale equipment cannot be quickly deployed to the core area of ​​the fire source, leading to missed opportunities for optimal toxicity control. Third, the system has poor anti-clogging capabilities and ease of maintenance. The large amount of smoke and molten debris generated during combustion easily clogs the air inlet and filter unit, and traditional bolt-fixed filters are time-consuming and labor-intensive to disassemble and replace in emergency situations. Finally, there is a risk of secondary pollution. Direct discharge of toxic waste liquid generated during the treatment process will seriously pollute the soil and water bodies, violating environmental protection principles. Summary of the Invention

[0003] The purpose of this invention is to provide a toxic gas treatment system for vehicle fire scenes, which can effectively treat toxic gases at vehicle fire scenes through integrated, modular and targeted design and continuous multi-stage treatment processes.

[0004] To achieve the above objectives, the present invention provides a toxic gas treatment system for vehicle fire scenes, comprising:

[0005] An air intake unit that collects and initially filters gases at the fire scene;

[0006] A core processing unit, connected to the air intake unit, performs multi-stage purification and physical treatment on the gas. The core processing unit comprises, sequentially along the gas flow direction, the following components:

[0007] The primary treatment section includes a spraying device that sprays cooling liquid downwards.

[0008] The secondary treatment section includes a water tank filled with a chemical solution, and a U-shaped pipe array is installed inside the water tank. The pipes of the U-shaped pipe array are densely arranged in the middle area and sparsely arranged in the two side areas.

[0009] The end-of-line treatment section includes a condenser network, a drying chamber, and an activated carbon filter element.

[0010] A water circulation unit is connected to the core processing unit, and the water circulation unit collects, processes and recycles the waste liquid generated by the system.

[0011] An exhaust unit, connected to the core processing unit, directs the emission of purified gas.

[0012] In one embodiment of the present invention, the air intake unit includes an air collection port, a filter screen, and a long duct.

[0013] The air collection port has a conical structure with multiple air holes on the conical surface;

[0014] The filter screen is made of high-temperature resistant material and is detachably connected to the main body of the air intake unit through a rotating snap-fit ​​structure.

[0015] In one embodiment of the present invention, the rotating snap-fit ​​structure is configured to rotate the filter screen by 90 degrees to achieve quick insertion and removal.

[0016] In one embodiment of the present invention, the primary processing section further includes:

[0017] The spraying device is located at the top of the primary treatment section;

[0018] A filter screen is installed below the spray device to collect the precipitate formed by the reaction.

[0019] A collection tank is connected to the filter screen, and the collection tank discharges the sediment to the waste liquid pool.

[0020] In one embodiment of the present invention, the chemical solution filled in the secondary treatment section is an alkaline absorbent or an oxidizing solution with a specific catalyst added.

[0021] The gas forms bubbles in the middle region of the secondary treatment section and reacts fully with the chemical solution, while forming a circulation in the lateral regions that facilitates the accumulation of precipitates.

[0022] In one embodiment of the present invention, a one-way valve structure for discharging precipitates is provided at the bottom of the secondary treatment section, wherein the aperture of the one-way valve structure is larger on the outside and smaller on the inside.

[0023] In one embodiment of the present invention, the condensation network condenses water vapor in the gas;

[0024] The drying chamber is located after the condenser pipe network;

[0025] The activated carbon filter element is placed in the drying chamber to adsorb residual harmful gases.

[0026] In one embodiment of the present invention, the water circulation unit includes a waste liquid tank and a water level gauge;

[0027] The waste liquid tank is connected to the waste liquid outlet of the core treatment unit through a wastewater pipe, and the waste liquid tank is connected to the spray device pipeline of the primary treatment section through a water inlet pipe, forming a circulating water circuit.

[0028] The water level gauge controls the replenishment of water to the waste liquid tank or the diversion of waste liquid.

[0029] In one embodiment of the present invention, the outlet direction of the exhaust unit is adjustable, configured to discharge purified gas to the left or right.

[0030] In one embodiment of the present invention, the system is a mobile integrated device.

[0031] The present invention has the following beneficial effects:

[0032] This invention achieves significant technical results through integrated, modular, and targeted design: via a continuous multi-stage treatment process, it can remove particulate matter, acidic gases, soluble toxic substances, and residual gaseous pollutants in stages, resulting in highly clean exhaust gas that significantly improves air quality at accident sites and ensures the safety of rescue personnel. The system is integrated into a mobile device, allowing for rapid deployment and proximity to the fire scene. The design of the intake and exhaust units fully considers the site layout, with adjustable exhaust direction to prevent purified gas from interfering with rescue operations, enabling "simultaneous rescue and purification" and effectively enhancing the adaptability and mobility of on-site operations. The system utilizes a conical air intake with a rationally distributed pore pattern to prevent large particles from directly clogging the air passages. Combined with a 90-degree rotating snap-on filter, the filter can be quickly inserted and replaced within seconds without tools, significantly improving the system's continuous operation and maintenance efficiency under harsh conditions, and providing excellent anti-clogging and rapid maintenance capabilities. This system employs a honeycomb-shaped U-shaped tube layout. The unique arrangement, with densely packed tubes in the middle and open sections on both sides, not only increases the gas-liquid contact area and reaction time but also utilizes hydraulic characteristics to create circulation on both sides, guiding the reacted precipitates towards the collection area. Simultaneously, a one-way valve (larger on the outside, smaller on the inside) ensures the precipitates are smoothly discharged under gravity, preventing backflow of liquid and gas and enhancing the gas-liquid reaction and solid-liquid separation effects. The system constructs a closed-loop water circulation unit, centrally purifying and reusing spray wastewater and treated waste liquid, significantly reducing fresh water consumption and on-site wastewater discharge, achieving environmental protection and resource recycling, and practicing the concept of green emergency response. The system's various treatment units have clearly defined functions and seamless connections. Automatic level control ensures the balance of the water circulation unit. The overall system design is compact, with clear operating logic, and possesses stable and reliable operating performance. Attached Figure Description

[0033] Figure 1A structural diagram of a toxic gas treatment system for a vehicle fire scene according to an embodiment of the present invention is disclosed.

[0034] Figure 2 A structural diagram of the air intake unit of a toxic gas treatment system for vehicle fire scenes, according to an embodiment of the present invention, is disclosed.

[0035] Figure 3 The diagram shows a detailed structural diagram of a toxic gas treatment system for vehicle fire scenes according to an embodiment of the present invention.

[0036] Figure Labels

[0037] 1. Air intake unit; 11. Air collection port; 12. Filter screen; 13. Long duct; 2. Core processing unit; 21. Primary processing section; 211. Spray device; 212. Spray device pipeline; 213. Filter screen; 214. Collection tank; 22. Secondary processing section; 221. Water tank; 222. U-shaped pipeline array; 223. One-way valve structure; 23. Terminal processing section; 231. Condensation network; 232. Drying chamber; 233. Activated carbon filter element; 3. Water circulation unit; 31. Waste liquid pool; 32. Wastewater pipe; 33. Water inlet pipe; 34. Water level gauge; 4. Exhaust unit. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0039] like Figure 1 As shown, a toxic gas treatment system for vehicle fire scenes includes an intake unit 1, a core processing unit 2, a water circulation unit 3, and an exhaust unit 4.

[0040] The air intake unit 1 collects and performs preliminary filtration of gases at the fire scene.

[0041] The core processing unit 2 is connected to the air intake unit 1. The core processing unit 2 performs multi-stage purification and physical treatment on the gas. The core processing unit 2 includes a primary processing section 21, a secondary processing section 22, and a final processing section 23 along the gas flow direction.

[0042] The primary treatment section 21 includes a spray device 211 that sprays cooling liquid downwards. The secondary treatment section 22 includes a water tank 221 filled with a chemical solution. A U-shaped pipe array 222 is installed inside the water tank 221. The pipes in the U-shaped pipe array 222 are densely arranged in the middle area and sparsely arranged on both sides. Preferably, in this embodiment, rows of U-shaped pipes are arranged inside the water tank 221. The U-shaped pipe array 222 consists of multiple interconnected U-shaped pipes forming an integrated gas guiding channel. These U-shaped pipes are made of corrosion-resistant material. The air inlet of the U-shaped pipe array 222 is connected to the gas outlet of the primary treatment section 21, and multiple air outlets are provided on the middle section of the U-shaped pipe array 222 to allow toxic gases to be discharged into the external chemical solution. The arrangement of the U-shaped pipes presents a "dense in the middle, sparse on both sides" pattern. Furthermore, in the middle region, the U-shaped tubes are arranged closely, with the spacing between them possibly only 1-2 times the tube diameter, forming a dense reaction zone. In the lateral regions, the number of U-shaped tubes is significantly reduced or completely vacant, forming flow channels. Furthermore, an exhaust port is provided at the upper rear side of the water tank 221, which is physically connected to the air inlet of the condenser network 231 of the end-treatment section 23 via a rigid pipe or a direct flange interface. The end-treatment section 23 includes the condenser network 231, the drying chamber 232, and the activated carbon filter element 233. The water circulation unit 3 is connected to the core treatment unit 2, and collects, treats, and recycles the waste liquid generated by the system. The exhaust unit 4 is connected to the core treatment unit 2, and the exhaust unit 4 discharges the purified gas in a directed manner.

[0043] In this embodiment, as Figure 2 As shown, the air intake unit 1 includes an air collection port 11, a filter screen 12, and a long duct 13.

[0044] The air collection port 11 has a conical structure with multiple air holes on its surface. Preferably, in this embodiment, the air collection port 11 is designed as a frustum-shaped cone with multiple air holes evenly distributed along the circumference and axial direction. The diameter of the air holes has been experimentally optimized and can be set to 2 mm, 3 mm, or a stepped combination selected according to the actual particle size distribution of the debris. This conical design ensures that large combustion residue particles primarily impact the conical surface rather than directly clogging the channels during intake, and can slide down the conical surface under gravity or airflow, eventually entering the debris collection chamber at the bottom for temporary storage. Compared to a planar screen, this design increases the effective air intake area and reduces the probability of the channels being blocked from the front.

[0045] The filter screen 12 is made of a high-temperature resistant material and is detachably connected to the main body of the intake unit 1 via a rotating snap-fit ​​structure. Preferably, in this embodiment, the filter screen 12 is made of high-temperature resistant and corrosion-resistant 316L stainless steel wire mesh or aluminum alloy honeycomb panel. Symmetrical "L"-shaped slots are provided on the edge of its mounting frame. Correspondingly, a locking pin matching the slot is provided on the mounting base of the intake unit 1.

[0046] In this embodiment, the rotating snap-fit ​​structure is configured to rotate the filter screen 12 90 degrees for quick insertion and removal. Preferably, during installation, the slot on the filter screen 12 frame is aligned with the locking pin, and then rotated clockwise approximately 90 degrees. The locking pin slides into the horizontal portion of the "L"-shaped slot, securely locking the filter screen 12. A 90-degree reverse rotation unlocks and removes the filter screen 12. The entire process requires no tools and can be completed within seconds. This rotating snap-fit ​​structure ensures a tight connection while enabling rapid disassembly and replacement, making it suitable for disaster sites requiring frequent maintenance.

[0047] In this embodiment, as Figure 3 As shown, the primary processing section 21 also includes:

[0048] The spray device 211 is located at the top of the primary treatment section 21. In this preferred embodiment, multiple sets of shower heads are evenly distributed inside the upper cover of the primary treatment unit. The shower heads are solid conical or fan-shaped nozzles. The nozzles are arranged in a matrix to cover the entire cross-section of the tank, ensuring no dead spots in the spray.

[0049] A filter screen 213 is positioned below the spray device 211 to collect the precipitate formed during the reaction. Preferably, in this embodiment, one or more inclined stainless steel filter screens 213 are arranged directly below the spray area. The filter screen 213 is used to intercept and collect the reaction products and solid impurities washed down by the chemical solution. These substances form a precipitate slurry on the filter screen 213.

[0050] The collection tank 214 is connected to the filter screen 213, and the collection tank 214 discharges the sediment to the waste liquid tank 31.

[0051] In this embodiment, the chemical solution filled in the secondary treatment section 22 is an alkaline absorbent or an oxidizing solution with a specific catalyst. Preferably, the water tank 221 is filled with a special chemical absorbent solution formulated for the target gas. Further, the target gas is hydrogen fluoride (HF), hydrogen cyanide (HCN), volatile organic compounds (VOCs), etc. The gas forms bubbles in the middle region of the secondary treatment section 22 and reacts fully with the chemical solution, forming a circulation on both sides that facilitates the accumulation of precipitates. Preferably, in this embodiment, after the toxic gas enters and flows inside the U-shaped pipe array 222, it is discharged into the chemical solution in the water tank from the outlet in the middle of the array. The toxic gas makes large-area contact with the chemical solution in the form of bubbles, and the dissolved toxic components are fully absorbed or react to form precipitates. The working principle of the circulation and sediment collection of toxic gases in the secondary treatment section 22 is as follows: Based on the U-shaped tube arrangement design of "dense in the middle and sparse on both sides," the dense U-shaped tubes in the middle area cause the large amount of discharged toxic gases to cause the bubbles to rise violently, forming a low-density gas-liquid mixing zone. Under the drag force of the large number of rising bubbles, the liquid is driven upward. On the sides, due to the sparse or empty arrangement of U-shaped tubes, there is basically no bubble generation, which is a high-density relatively static zone. Based on the principle of communicating vessels and gravity, the liquid naturally flows downward. Therefore, a stable vertical circulation with the middle rising and the sides falling is naturally formed on both sides of the water tank 221. This vertical circulation not only promotes solution mixing and mass transfer, but also, through the combined effect of the directional circulation of the liquid flow and gravity sedimentation, slowly pushes the precipitates generated by the reaction to the static flow zone on both sides and settles to the bottom of the water tank, thereby achieving effective collection of the precipitates for subsequent discharge. Furthermore, in the secondary treatment section 22, the gas, after secondary treatment, rises as bubbles and escapes from the surface of the chemical solution, then collects in a sealed gas collection space above the water tank 221. Subsequently, driven by the airflow pressure, the collected gas is directed into the air inlet of the final treatment section 23 via a connecting pipe. Further, the airflow pressure is driven by adding a continuous suction device at the front end of the air inlet unit or an exhaust fan at the rear end of the exhaust unit, creating a total system pressure differential.

[0052] In this embodiment, a one-way valve structure 223 for discharging sediment is provided at the bottom of the secondary treatment section 22. The orifice of the one-way valve structure 223 is larger on the outside and smaller on the inside. Preferably, in this embodiment, the end of the one-way valve structure 223 connected to the collection tank 214 has a larger opening to facilitate the collection of sediment slurry; the end leading to the external slag discharge pipe has a smaller diameter flow-limiting outlet and is equipped with a gravity valve or elastic duckbill valve that can only be opened outwards. The working process is as follows: when the sediment in the collection tank 214 accumulates to a certain amount, the static pressure overcomes the internal resistance of the one-way valve structure 223, the valve opens, and the thick slurry is discharged to the waste liquid tank 31 under the action of gravity.

[0053] In this embodiment, the condenser network 231 condenses water vapor in the gas. Preferably, the condenser network 231 adopts a multi-row finned tube or serpentine coil layout to maximize the heat exchange area. A low-temperature cooling medium provided by an independent cooling module flows inside the network. When gas from the secondary treatment, which is close to room temperature but still rich in water vapor, flows across the surface of the cooling network, the gas temperature is further reduced, and a large amount of water vapor rapidly condenses into liquid water. The condensate drips down the surface of the network, collects in a condensate collection pan below the network, and is then piped into the waste liquid pool of the water circulation system for water resource recovery. A drying chamber 232 is located after the condenser network 231. An activated carbon filter element 233 is located in the drying chamber 232 to adsorb residual harmful gases. Preferably, the activated carbon undergoes special treatment to enhance its effectiveness against specific residual harmful gases. Gas penetrates the activated carbon layer at a low flow rate, and residual pollutant molecules are firmly captured on the large microporous surface area of ​​the activated carbon.

[0054] In this embodiment, the water circulation unit 3 includes a waste liquid tank 31 and a water level gauge 34.

[0055] Waste liquid tank 31 is connected to the waste liquid outlet of core treatment unit 2 via wastewater pipe 32. Waste liquid tank 31 is connected to the spray device pipeline 212 of primary treatment section 21 via water inlet pipe 33, forming a circulating water circuit. In this preferred embodiment, all liquid wastewater generated in the system is collected into the waste liquid tank through the pipeline network. These waste liquids mainly include: spray wastewater: a mixture from the primary treatment section containing neutralization reaction products and a large amount of solid impurities. Process wastewater: carry-on liquid from the sediment discharge of the secondary treatment section, and condensate generated by the end treatment unit. All waste liquids are introduced into the waste liquid tank through corrosion-resistant pipes by gravity or slight negative pressure. Furthermore, the waste liquid tank is connected to a wastewater purification system for wastewater treatment.

[0056] The water level gauge 34 controls the replenishment of water to the waste liquid tank 31 or the diversion of waste liquid. Preferably, in this embodiment, the waste liquid tank 31 can be used to purify the waste liquid before recycling it. Furthermore, when the water level in the cleaning water tank falls below a set lower limit, the control system automatically activates the external water supply valve to replenish the system with clean water until the water level returns to normal.

[0057] In this embodiment, the outlet direction of the exhaust unit 4 is adjustable, configured to discharge purified gas to the left or right. Preferably, in this embodiment, the exhaust unit 4 is an upwardly curved chimney-shaped structure.

[0058] In this embodiment, the system is a mobile integrated device.

[0059] In one embodiment of the present invention, the toxic gas connection flow path between the various treatment sections of the system is as follows: S1, high-temperature toxic gas from the fire scene is drawn in by the air intake unit 1 and smoothly introduced into the primary treatment section 21 for physical spray cooling and large particle washing. S2, the gas is guided to the interior of the U-shaped pipe array in the secondary treatment section 22 and discharged into the chemical solution through the air outlet of the U-shaped pipe array. During the process of bubble rising and fluid circulation, chemical reaction and toxicity absorption are completed. The residual gas after the reaction escapes from the liquid surface, collects in the sealed gas collection space at the top of the water tank, and is transferred to the final treatment section 23 under the guidance of the overall system operating pressure difference. S3, the gas after the reaction passes through the condenser network 231 for water removal, the drying chamber 232 for dehumidification, and the activated carbon filter element 233 for deep adsorption of toxic gases and odors, and finally becomes clean gas that is directionally discharged by the exhaust unit. Within the entire system, the flow of gas between each process relies on the smooth connection between the sealed enclosure and the connecting pipeline, forming a complete closed loop of "intake collection - physical pretreatment - chemical treatment - physical retreatment - directional exhaust".

[0060] The present invention has the following beneficial effects:

[0061] This invention achieves significant technical results through integrated, modular, and targeted design: via a continuous multi-stage treatment process, it can remove particulate matter, acidic gases, soluble toxic substances, and residual gaseous pollutants in stages, resulting in highly clean exhaust gas that significantly improves air quality at accident sites and ensures the safety of rescue personnel. The system is integrated into a mobile device, allowing for rapid deployment and proximity to the fire scene. The design of the intake and exhaust units fully considers the site layout, with adjustable exhaust direction to prevent purified gas from interfering with rescue operations, enabling "simultaneous rescue and purification" and effectively enhancing the adaptability and mobility of on-site operations. The system utilizes a conical air intake with a rationally distributed pore pattern to prevent large particles from directly clogging the air passages. Combined with a 90-degree rotating snap-on filter, the filter can be quickly inserted and replaced within seconds without tools, significantly improving the system's continuous operation and maintenance efficiency under harsh conditions, and providing excellent anti-clogging and rapid maintenance capabilities. This system employs a honeycomb-shaped U-shaped tube layout. The unique arrangement, with densely packed tubes in the middle and open sections on both sides, not only increases the gas-liquid contact area and reaction time but also utilizes hydraulic characteristics to create circulation on both sides, guiding the reacted precipitates towards the collection area. Simultaneously, a one-way valve (larger on the outside, smaller on the inside) ensures the precipitates are smoothly discharged under gravity, preventing backflow of liquid and gas and enhancing the gas-liquid reaction and solid-liquid separation effects. The system constructs a closed-loop water circulation unit, centrally purifying and reusing spray wastewater and treated waste liquid, significantly reducing fresh water consumption and on-site wastewater discharge, achieving environmental protection and resource recycling, and practicing the concept of green emergency response. The system's various treatment units have clearly defined functions and seamless connections. Automatic level control ensures the balance of the water circulation unit. The overall system design is compact, with clear operating logic, and possesses stable and reliable operating performance.

[0062] The embodiments described above are merely further illustrations of the present invention and are not intended to limit the present invention in any other way. The present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding modifications and changes based on the present invention, but all such modifications and changes should fall within the protection scope of the present invention.

Claims

1. A toxic gas treatment system for vehicle fire scenes, characterized in that, include: An air intake unit that collects and initially filters gases at the fire scene; A core processing unit, connected to the air intake unit, performs multi-stage purification and physical treatment on the gas. The core processing unit comprises, sequentially along the gas flow direction, the following components: The primary treatment section includes a spraying device that sprays cooling liquid downwards. The secondary treatment section includes a water tank filled with a chemical solution, and a U-shaped pipe array is installed inside the water tank. The pipes of the U-shaped pipe array are densely arranged in the middle area and sparsely arranged in the two side areas. The end-of-line treatment section includes a condenser network, a drying chamber, and an activated carbon filter element. A water circulation unit is connected to the core processing unit, and the water circulation unit collects, processes and recycles the waste liquid generated by the system. An exhaust unit is connected to the core processing unit, and the exhaust unit discharges the purified gas in a directional manner. The U-shaped pipe array consists of multiple interconnected U-shaped pipes forming an integrated gas-guiding channel. Multiple air outlets are located on the central section of the U-shaped pipe array. In the central region, the U-shaped pipes are closely arranged, with a spacing of 1-2 times the pipe diameter, forming a dense reaction zone. In the two side regions, the number of U-shaped pipes is significantly reduced or completely vacant, forming a flow channel. The large amount of toxic gas discharged causes the bubbles in the central region to rise violently, forming a low-density gas-liquid mixing zone. Under the drag force of the large number of rising bubbles, the liquid flows upward. In the two side regions, almost no bubbles are generated, forming a high-density, relatively static region. Based on the principle of communicating vessels and gravity, the liquid naturally flows downward, thus naturally forming a stable vertical circulation on both sides of the tank, with the central part rising and the sides falling. This vertical circulation, relying on the combined effect of directional liquid flow and gravity settling, pushes the precipitates generated by the reaction towards the static flow zones on both sides and allows them to settle to the bottom of the tank.

2. The toxic gas treatment system for vehicle fire scenes according to claim 1, characterized in that, The air intake unit includes an air collection port, a filter screen, and a long duct. The air collection port has a conical structure with multiple air holes on the conical surface; The filter screen is made of high-temperature resistant material and is detachably connected to the main body of the air intake unit through a rotating snap-fit ​​structure.

3. The toxic gas treatment system for vehicle fire scenes according to claim 2, characterized in that, The rotating snap-fit ​​structure is configured to rotate the filter screen 90 degrees, enabling quick insertion and removal.

4. The toxic gas treatment system for vehicle fire scenes according to claim 1, characterized in that, The primary processing section also includes: The spraying device is located at the top of the primary treatment section; A filter screen is installed below the spray device to collect the precipitate formed by the reaction. A collection tank is connected to the filter screen, and the collection tank discharges the sediment to the waste liquid pool.

5. The toxic gas treatment system for vehicle fire scenes according to claim 1, characterized in that, The chemical solution filled in the secondary treatment section is an alkaline absorbent or an oxidizing solution with a specific catalyst added. The gas forms bubbles in the middle region of the secondary treatment section and reacts fully with the chemical solution, while forming a circulation in the lateral regions that facilitates the accumulation of precipitates.

6. The toxic gas treatment system for vehicle fire scenes according to claim 5, characterized in that, The bottom of the secondary treatment section is equipped with a one-way valve structure for discharging precipitates, and the aperture of the one-way valve structure is larger on the outside and smaller on the inside.

7. The toxic gas treatment system for vehicle fire scenes according to claim 1, characterized in that, In the terminal processing section, The condensation network condenses water vapor in the gas. The drying chamber is located after the condenser pipe network; The activated carbon filter element is placed in the drying chamber to adsorb residual harmful gases.

8. The toxic gas treatment system for vehicle fire scenes according to claim 1, characterized in that, The water circulation unit includes a waste liquid tank and a water level gauge; The waste liquid tank is connected to the waste liquid outlet of the core treatment unit through a wastewater pipe, and the waste liquid tank is connected to the spray device pipeline of the primary treatment section through a water inlet pipe, forming a circulating water circuit. The water level gauge controls the replenishment of water to the waste liquid tank or the diversion of waste liquid.

9. The toxic gas treatment system for vehicle fire scenes according to claim 1, characterized in that, The exhaust unit has an adjustable outlet direction, configured to discharge purified gas to the left or right.

10. The toxic gas treatment system for a vehicle fire scene according to any one of claims 1 to 9, characterized in that, The system is a mobile integrated device.

Images