Tunnel jet type waste gas purification system

Abstract

The invention relates to a tunnel jet type waste gas purification system. The system comprises a jet fan, a first purification device and a second purification device which are mounted at the top of a tunnel, the jet fan is used for forming jet airflow in the axial direction of the tunnel; the first purification device is arranged at the downstream of the jet fan and is adjacent to the jet fan; the first purification device comprises a rear-end air inlet, a first purification module and a first jet nozzle; the second purification device and the jet fan are arranged in a non-adjacent manner; the second purification device comprises a lower air inlet, a second purification module and a second jet nozzle; and the first jet flow nozzle and the second jet flow nozzle face the driving direction of the tunnel and form an included angle not smaller than 15 degrees with the driving direction, so that the sprayed clean air flow can disturb air in the lower layer of the tunnel, and circulating purification is achieved. Waste gas in the lower space of the tunnel is actively disturbed and purified through the jet technology, the purification efficiency is improved, and the air quality of a personnel activity area in the tunnel is improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel ventilation and purification, and specifically to a tunnel jet-type exhaust gas purification system. Background Technology

[0002] With the rapid pace of urbanization, the number of underground transportation facilities such as subways and highway tunnels is increasing rapidly, and the air quality inside tunnels is receiving increasing attention. Vehicles operating in tunnels emit large amounts of exhaust fumes containing pollutants such as particulate matter, nitrogen oxides, carbon monoxide, and hydrocarbons. These pollutants easily accumulate in enclosed or semi-enclosed spaces, and if not promptly discharged or purified, they not only affect the air quality inside the tunnel but also threaten the health and safety of drivers and maintenance personnel. Therefore, tunnel ventilation and exhaust gas purification systems have become crucial supporting facilities in tunnel operation. Currently, to improve tunnel air quality, exhaust gas purification devices are often installed on the tunnel ceiling or sidewalls. These devices purify the gas through filtration, electrostatic adsorption, and catalytic oxidation, removing some pollutants before discharge or recycling, thus achieving the dual goals of energy conservation and environmental protection.

[0003] However, existing tunnel exhaust gas purification devices are mostly concentrated in the upper part of the tunnel, and the purified gas is mainly distributed in the upper space of the tunnel, making it difficult to effectively cover the lower part of the driving area. Since vehicle exhaust outlets are usually located at a low position, and particulate matter is denser and more prone to settling, the concentration of pollutants in the air at the bottom of the tunnel is often higher. Furthermore, the upper purification airflow cannot adequately disturb the lower area, resulting in significant purification dead zones. Existing solutions generally suffer from uneven distribution of purification airflow, low efficiency of lower-level air replacement, and difficulty in capturing settled particles, leading to unsatisfactory improvement in the air quality of the lower tunnel, and even a stratification phenomenon of "clean upper layer, polluted lower layer." Therefore, there is an urgent need to develop a jet-type exhaust gas purification system that can actively disturb and purify the air in the lower part of the tunnel to achieve overall airflow circulation and efficient purification within the tunnel. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention provides a tunnel jet-type exhaust gas purification system, which aims to actively disturb and purify exhaust gas in the lower space of the tunnel through jet technology, thereby improving purification efficiency and air quality in areas where people are active within the tunnel.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A tunnel jet-type exhaust gas purification system includes a jet fan installed at the top of the tunnel, a first purification device, and a second purification device; the jet fan is used to form a jet airflow along the tunnel axis. The first purification device is located downstream of and adjacent to the jet fan. The first purification device includes a rear air inlet, a first purification module and a first jet nozzle. The rear air inlet is located at the rear end of the first purification device, so that the airflow enters the purification module parallel to the tunnel axis and is ejected through the jet nozzle. The second purification device is not arranged adjacent to the jet fan. The second purification device includes a lower air inlet, a second purification module, and a second jet nozzle. The lower air inlet is located at the lower part of the second purification device and is used to directly draw in exhaust gas containing particulate matter and harmful gases from the lower area of ​​the tunnel. Both the first jet nozzle and the second jet nozzle are oriented toward the tunnel's driving direction and form an angle of not less than 15° with the driving direction, so that the ejected clean airflow can disturb the lower layer of air in the tunnel and achieve circulation and purification.

[0006] Preferably, both the first purification module and the second purification module include a fan and one or more combinations of a primary filter unit, an electrostatic purification unit, an activated carbon adsorption layer, or a backwashing device.

[0007] Preferably, the outlet cross-sectional area of ​​the first jet nozzle and the second jet nozzle is smaller than the inlet cross-sectional area, so as to increase the outlet wind speed and increase the jet distance.

[0008] Preferably, the first jet nozzle and the second jet nozzle are provided with guide ribs arranged along the airflow direction to suppress turbulence and maintain laminar flow when the airflow changes from the parallel tunnel direction to the oblique downward direction.

[0009] Preferably, the guide rib is disposed at the upper part of the first jet nozzle and the second jet nozzle, and can be driven by an electric actuator to move up and down vertically inside the first jet nozzle and the second jet nozzle; when the outlet wind speed is higher than a first preset threshold, the electric actuator drives the guide rib to descend to the middle position to enhance the airflow guidance and rectification effect; when the outlet wind speed is lower than the first preset threshold, the electric actuator drives the guide rib to return to the upper position to reduce airflow resistance and maintain jet stability.

[0010] Preferably, it also includes a control device, wherein the first jet nozzle and the second jet nozzle are respectively provided with wind speed sensors, and the control device controls the electric actuator that drives the guide ribs to rise and fall based on the wind speed signal of the wind speed sensor.

[0011] Preferably, a concealed air guide plate is provided on the bottom outer side of the first jet nozzle and the second jet nozzle. When the outlet wind speed is higher than the second preset threshold, the concealed air guide plate extends to guide the high-speed airflow.

[0012] Preferably, the second preset threshold is greater than the first preset threshold.

[0013] Preferably, the concealed air guide plate can be extended or retracted via a slide rail or hinge mechanism.

[0014] Preferably, an air quality sensor is installed in the tunnel, and the control device controls the fan speed of the jet fan, the first purification device, and the second purification module based on the signal from the air quality sensor, to ensure that the outlet wind speed of the first jet nozzle and the second jet nozzle is not less than the piston wind speed. Compared with the prior art, the advantages of the present invention are as follows: (1) This invention, by arranging the jet nozzles obliquely downwards and utilizing high-speed clean jets to actively disturb the air in the lower layer of the tunnel, causes particulate matter and polluted gases deposited at the bottom to be drawn into the purification path. This overcomes the limitation of traditional top-mounted purification devices that cannot reach the bottom settling area, achieving precise purification of the air in the tunnel's personnel activity area and significantly improving air quality and ventilation efficiency. The system can select either a rear-end parallel air intake mode or a lower-end vertical air intake mode based on the relative position of the purification device and the jet fan. The former fully utilizes the momentum effect of the jet fan to improve airflow delivery efficiency, while the latter directly extracts polluted air from the lower layer of the tunnel to enhance the adaptability of the purification system to different tunnel cross sections and airflow conditions.

[0015] (2) The guide ribs inside the jet nozzle can effectively maintain the laminar flow state of the airflow, reduce the formation of turbulence, ensure the stability of the jet direction and the concentration of energy, thereby expanding the disturbance range, improving the airflow delivery distance and purification effect. Moreover, the guide ribs inside the jet nozzle adopt a liftable arrangement and are dynamically adjusted according to the real-time monitoring signal of the outlet wind speed. When the wind speed is high, the guide ribs descend to the middle of the nozzle to enhance guidance and rectification; when the wind speed is low, they rise to the top to reduce air resistance and maintain jet stability. This structure realizes adaptive adjustment based on airflow feedback, which significantly improves the aerodynamic performance and energy-saving effect of the system.

[0016] (3) The system is equipped with a control device that combines the real-time signals from the wind speed sensor and the air quality sensor to dynamically coordinate the jet fan, purification module, guide ribs, and hidden air guide plate. Based on the wind speed, the airflow speed and guidance are intelligently controlled to ensure that the wind speed at the jet nozzle outlet is always not lower than the piston wind speed, so that the overall airflow in the tunnel remains in a continuous circulation and highly efficient purification state, thereby realizing the closed-loop operation of "detection-control-optimization" and effectively improving the stability and intelligence level of the system operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the tunnel jet exhaust gas purification system according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the installation of the concealed air guide plate according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of the first purification device according to an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the control connection of the tunnel jet exhaust gas purification system according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached drawings: 1-Jet fan; 2-First purification device; 21-Rear air inlet; 22-First purification module; 23-First jet nozzle; 3-Second purification device; 31-Lower air inlet; 32-Second purification module; 33-Second jet nozzle; 4-Guide ribs; 5-Electric actuator; 6-Control device; 7-Wind speed sensor; 8-Hidden air guide plate; 81-Storage space; 9-Air quality sensor. Detailed Implementation

[0022] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the present invention.

[0023] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0024] like Figure 1-4 As shown, this embodiment discloses a tunnel jet-type exhaust gas purification system, including a jet fan 1 installed at the top of the tunnel, a first purification device 2, and a second purification device 3. The jet fan 1 is used to form a jet airflow along the tunnel axis, establishing a longitudinal airflow channel inside the tunnel through high-pressure air delivery, providing a kinetic energy basis for subsequent purification modules, and promoting air circulation and uniform flow field distribution inside the tunnel, thereby creating favorable aerodynamic conditions for the collection and treatment of pollutants.

[0025] The first purification device 2 is located downstream of and adjacent to the jet fan 1. The first purification device 2 includes a rear air inlet 21, a first purification module 22, and a first jet nozzle 23. The rear air inlet 21 is located at the rear end of the first purification device 2, allowing airflow to enter the first purification module 22 parallel to the tunnel axis and exit through the first jet nozzle 23. This parallel air inlet structure fully utilizes the airflow generated by the jet fan 1, achieving unidirectional gas flow and rapid purification, while avoiding the formation of airflow vortices.

[0026] The second purification device 3 is arranged non-adjacent to the jet fan 1. The second purification device 3 includes a lower air inlet 31, a second purification module 32, and a second jet nozzle 33. The lower air inlet 31 is located at the bottom of the second purification device 3 and is used to directly draw in exhaust gas containing particulate matter and harmful gases from the lower layer of the tunnel. This arrangement allows the system to actively capture polluted gases deposited at the bottom of the tunnel, avoiding long-term stagnation of lower-layer air and thus improving the overall purification coverage. The second purification module 32 has the same purification principle as the first purification module 22, but the air intake direction is different to adapt to the pollution characteristics of different flow field areas.

[0027] Both the first jet nozzle 23 and the second jet nozzle 33 face the tunnel's travel direction, forming an angle of at least 15° with it. This allows the ejected clean airflow to disturb the lower layer of air in the tunnel and achieve circulation and purification. This jet angle design ensures that the airflow has sufficient longitudinal thrust while also creating a suitable downward angle, thereby maximizing coverage of the lower space of the travel area and avoiding purification dead zones. Through the synergistic effect of the above structures, the tunnel jet-type exhaust gas purification system achieves a purification pattern of "upper air supply, lower suction, and full-area circulation," effectively improving the tunnel's air circulation efficiency and the quality of the lower layer of air.

[0028] Furthermore, both the first purification module 22 and the second purification module 32 include a fan and one or more combinations of a pre-filter unit, an electrostatic purification unit, an activated carbon adsorption layer, or a backwashing device. By installing a fan inside the purification module, a stable airflow driving force can be provided under different operating conditions, allowing polluted air to pass smoothly through each stage of the purification structure and achieving continuous purification. The pre-filter unit is mainly used to capture large dust particles in the air and prevent downstream devices from clogging; the electrostatic purification unit uses a high-voltage electric field to adsorb fine particulate matter, further improving the air purification accuracy; the activated carbon adsorption layer can effectively remove organic gases and odor components in the exhaust gas, improving the air quality inside the tunnel; the backwashing device can periodically clean accumulated dust and maintain stable purification efficiency. The multi-unit combination design allows the system to be flexibly configured according to the tunnel pollution characteristics, ensuring both particulate matter removal capacity and the adsorption and purification effect of harmful gases.

[0029] Furthermore, the outlet cross-sectional area of ​​the first jet nozzle 23 and the second jet nozzle 33 is smaller than the inlet cross-sectional area to increase the outlet air velocity and the jet distance. By reducing the nozzle cross-sectional area, the purified airflow can be accelerated at the outlet, forming a high-speed jet zone, allowing the clean air to more powerfully impact the lower tunnel area, thereby creating air turbulence. The high-speed jet not only helps to lift the particles deposited at the bottom and re-enter the purification cycle, but also enhances the diffusion capacity of the airflow, making the purification area more uniform.

[0030] In this embodiment, the first jet nozzle 23 and the second jet nozzle 33 are internally provided with guide ribs 4 arranged along the airflow direction. These guide ribs are used to suppress turbulence and maintain laminar flow when the airflow changes from a parallel tunnel direction to an oblique downward jet. The guide ribs 4 enable the jet airflow to maintain a stable velocity distribution during deflection, avoiding turbulence and energy loss caused by changes in direction, thereby ensuring that the airflow forms a uniform jet surface upon ejection. Through reasonable rib spacing and angle design, the airflow is fully rectified before ejection, allowing the jet airflow to maintain strong momentum and controllability when disturbing the lower air layer, thereby improving air circulation efficiency and purification range.

[0031] Furthermore, the guide ribs 4 are positioned at the upper part of the first jet nozzle 23 and the second jet nozzle 33, and can be driven by the electric actuator 5 to move vertically up and down inside the first jet nozzle 23 and the second jet nozzle 33. When the outlet wind speed is higher than a first preset threshold, the electric actuator 5 drives the guide ribs 4 to descend to the middle position to enhance airflow guidance and rectification; when the outlet wind speed is lower than the first preset threshold, the electric actuator 5 drives the guide ribs 4 back to the upper position to reduce airflow resistance and maintain jet stability. Through the dynamic adjustment function of the electric actuator 5, the guide ribs 4 can adjust their spatial position inside the nozzle in real time according to the wind speed, so that the system can automatically balance the airflow kinetic energy and jet diffusion angle under different operating conditions. When the airflow speed is high, the guide ribs 4 are in the middle position to enhance the guiding effect and prevent excessive airflow divergence; while under low wind speed conditions, the upward movement of the ribs can reduce channel resistance and maintain the continuity of the jet flow field. This dynamic airflow guiding structure enables adaptive adjustment of the jet airflow, allowing the purification system to maintain good aerodynamic performance and purification effect across multiple wind speed ranges.

[0032] This embodiment also includes a control device 6. Wind speed sensors 7 are respectively installed inside the first jet nozzle 23 and the second jet nozzle 33. The control device 6 controls the electric actuator 5 that drives the guide ribs 4 to rise and fall based on the wind speed signals from the wind speed sensors 7. By arranging wind speed sensors 7 inside each jet nozzle, the system can monitor the wind speed changes at the nozzle outlet in real time, thereby accurately reflecting the current airflow state and load conditions. After receiving the wind speed signal, the control device 6 dynamically analyzes the airflow speed and outputs control commands to the electric actuator 5, enabling the guide ribs 4 to achieve intelligent lifting and lowering adjustment, realizing adaptive jet adjustment under different operating conditions.

[0033] Furthermore, concealed air guide plates 8 are provided on the bottom outer sides of the first jet nozzle 23 and the second jet nozzle 33. A storage space 81, closely attached to the nozzle housing, is also provided on the bottom outer sides of the first jet nozzle 23 and the second jet nozzle 33. The concealed air guide plates 8 can be hidden within this storage space 81 without affecting the overall appearance. When the outlet wind speed exceeds a second preset threshold, the concealed air guide plates 8 extend to guide the high-speed airflow. If the second preset threshold is greater than the first preset threshold, the action of the concealed air guide plates 8 is only triggered when the airflow speed further increases, thus avoiding frequent opening and closing under normal operating conditions that could cause mechanical damage or increased energy consumption. Normally, the concealed air guide plates 8 are stored inside the storage space 81, not affecting the airflow across the tunnel cross-section. When the wind speed exceeds the second preset threshold, the air guide plates 8 automatically extend, causing the jet airflow to form a downward deflection angle, thereby expanding the airflow disturbance range and enhancing the air entrainment effect at the bottom. The concealed air guide plate 8 can be extended and retracted via a slide rail or hinge mechanism, and is also controlled by the control device 6. After receiving the real-time wind speed signal transmitted by the wind speed sensor 7, the control device 6 determines whether the outlet wind speed is higher than the second preset threshold. When the detected value is higher than the threshold, the control device 6 issues a drive command to make the concealed air guide plate 8 automatically extend along the slide rail or hinge structure. When the outlet wind speed is lower than the threshold, the control device 6 controls the air guide plate 8 to retract to the concealed state.

[0034] In this embodiment, an air quality sensor 9 is installed in the tunnel. The control device 6 controls the fan speed of the jet fan 1, the first purification device 2, and the second purification module 32 based on the signal from the air quality sensor 9, ensuring that the outlet air velocity of the first jet nozzle 23 and the second jet nozzle 33 is not less than the piston speed. The air quality sensor 9 is arranged at typical cross-sectional positions in the tunnel's driving area or personnel activity area to monitor the concentration of pollutants, particulate matter, and harmful gases inside the tunnel in real time, providing a comprehensive reflection of the tunnel's air conditions. After receiving the detection signal from the air quality sensor 9, the control device 6 dynamically adjusts the operating power and speed of the jet fan 1 and the fans of each purification device according to changes in the concentration of pollutants in the air. When a decrease in air quality or an increase in pollutant concentration is detected, the speed of the jet fan 1 and the fans of the purification modules is automatically increased to enhance airflow delivery and exhaust gas entrainment capabilities; when the air quality improves, the speed is reduced to decrease energy consumption and achieve energy-saving operation. Through this intelligent adjustment method, the control device 6 can ensure that the outlet wind speed of the first jet nozzle 23 and the second jet nozzle 33 is always not less than the piston wind speed generated by the operation of the tunnel train, so that the air flow inside the tunnel is continuously in an active circulation state, effectively preventing local airflow stagnation, improving purification efficiency and ventilation stability, and realizing the dynamic balance and efficient operation of the purification system.

[0035] In summary, this invention discloses a tunnel jet-type exhaust gas purification system, including a jet fan 1 installed at the top of the tunnel, a first purification device 2 arranged downstream of the jet fan 1, and a second purification device 3 arranged away from the jet fan 1. The first purification device 2 and the second purification device 3 respectively achieve multi-directional exhaust gas intake through the rear air inlet 21 and the lower air inlet 31. The internal purification module performs multi-stage purification treatment on dust-containing and harmful gases, and sprays clean air obliquely downward at a certain angle through the first jet nozzle 23 and the second jet nozzle 33, forming a turbulent jet to achieve full-area circulation purification of the tunnel space. The system is equipped with core components such as guide ribs 4, electric actuators 5, control devices 6, wind speed sensors 7, concealed air guide plates 8, and air quality sensors 9. Through the linkage of multi-sensor signals and the control module, the airflow guidance and purification efficiency are optimized in real time. This invention, through the synergistic effect of jet perturbation and intelligent control, constructs a novel integrated technology system suitable for tunnel ventilation and environmental management. This system not only significantly improves the air quality in the lower tunnel levels and the overall purification efficiency but also reduces system energy consumption and operational complexity. This technical solution can be widely applied in urban subways, highway tunnels, and underground transportation hubs, providing new engineering ideas and technical pathways for the intelligent, energy-saving, and efficient development of tunnel ventilation and purification systems, and has significant value for widespread application.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above. For the sake of brevity, they are not provided in detail. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tunnel jet exhaust gas purification system, characterized in that, It includes a jet fan (1) installed on the top of the tunnel, a first purification device (2) and a second purification device (3); the jet fan (1) is used to form a jet airflow along the tunnel axis. The first purification device (2) is located downstream of and adjacent to the jet fan (1). The first purification device (2) includes a rear air inlet (21), a first purification module (22) and a first jet nozzle (23). The rear air inlet (21) is located at the rear end of the first purification device (2), so that the airflow enters the purification module (22) parallel to the tunnel axis and is ejected through the jet nozzle (23). The second purification device (3) is not adjacent to the jet fan (1). The second purification device (3) includes a lower air inlet (31), a second purification module (32), and a second jet nozzle (33). The lower air inlet (31) is located at the lower part of the second purification device (3) and is used to directly suck up exhaust gas containing particulate matter and harmful gases from the lower area of ​​the tunnel. The first jet nozzle (23) and the second jet nozzle (33) are both oriented toward the tunnel driving direction and form an angle of not less than 15° with the driving direction, so that the ejected clean airflow can disturb the air in the lower layer of the tunnel and achieve circulation purification.

2. The tunnel jet exhaust gas purification system according to claim 1, characterized in that, The first purification module (22) and the second purification module (32) both include a fan and one or more combinations of a primary filter unit, an electrostatic purification unit, an activated carbon adsorption layer, or a backwashing device.

3. The tunnel jet exhaust gas purification system according to claim 1, characterized in that, The outlet cross-sectional area of ​​the first jet nozzle (23) and the second jet nozzle (33) is smaller than the inlet cross-sectional area to increase the outlet wind speed and increase the jet distance.

4. The tunnel jet exhaust gas purification system according to claim 1, characterized in that, The first jet nozzle (23) and the second jet nozzle (33) are provided with guide ribs (4) arranged along the airflow direction to suppress turbulence and maintain laminar flow when the airflow changes from parallel tunnel direction to oblique downward jet.

5. The tunnel jet exhaust gas purification system according to claim 4, characterized in that, The guide rib (4) is located at the upper part of the first jet nozzle (23) and the second jet nozzle (33), and can be driven by the electric actuator (5) to move up and down in the vertical direction inside the first jet nozzle (23) and the second jet nozzle (33); When the outlet wind speed is higher than the first preset threshold, the electric actuator (5) drives the guide rib (4) to descend to the middle position to enhance the airflow guidance and rectification effect; when the outlet wind speed is lower than the first preset threshold, the electric actuator (5) drives the guide rib (4) to return to the upper position to reduce airflow resistance and maintain jet stability.

6. The tunnel jet exhaust gas purification system according to claim 5, characterized in that, It also includes a control device (6), in which wind speed sensors (7) are respectively provided inside the first jet nozzle (23) and the second jet nozzle (33). The control device (6) controls the electric actuator (5) that drives the guide rib (4) to rise and fall based on the wind speed signal of the wind speed sensor (7).

7. The tunnel jet exhaust gas purification system according to claim 6, characterized in that, The bottom outer sides of the first jet nozzle (23) and the second jet nozzle (33) are provided with hidden air guide plates (8). When the outlet wind speed is higher than the second preset threshold, the hidden air guide plates (8) extend to guide the high-speed airflow.

8. The tunnel jet exhaust gas purification system according to claim 7, characterized in that, The second preset threshold is greater than the first preset threshold.

9. The tunnel jet exhaust gas purification system according to claim 7, characterized in that, The concealed air guide plate (8) can be extended and retracted via a slide rail or hinge mechanism.

10. The tunnel jet exhaust gas purification system according to claim 6, characterized in that, An air quality sensor (9) is installed in the tunnel. The control device (6) controls the fan speed of the jet fan (1), the first purification device (2), and the second purification module (32) based on the signal from the air quality sensor (9), so as to ensure that the outlet wind speed of the first jet nozzle (23) and the second jet nozzle (33) is not less than the piston wind speed.

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