A tail gas pretreatment device and a tail gas pretreatment method

Abstract

This invention relates to the technical field of exhaust gas sampling and treatment, and discloses an exhaust gas pretreatment device and method. The exhaust gas pretreatment device includes an exhaust gas channel, a permeation chamber, and a manually operated flexible gas chamber. An inlet check valve is installed at the inlet of the exhaust gas channel, which is connected to an exhaust gas source. An outlet check valve is installed at the outlet of the exhaust gas channel. One end of the permeation chamber is connected to the outlet of the exhaust gas channel, and a water-removing permeation membrane is fixed inside the permeation chamber. The other end of the permeation chamber is used to discharge the pretreated exhaust gas. The manually operated flexible gas chamber is connected to the middle of the exhaust gas channel. The manually operated flexible gas chamber is used to draw the exhaust gas into the exhaust gas channel under external compression and pump the exhaust gas out to the permeation chamber. By repeatedly compressing the manually operated flexible gas chamber, in conjunction with the two check valves, the exhaust gas to be treated is continuously introduced and discharged into the permeation chamber. After water removal by the water-removing permeation membrane, the pretreatment is completed. The use of a manually operated flexible gas chamber instead of a motor reduces the dependence on power supply.

Description

Technical Field

[0001] This invention relates to the technical field of exhaust gas sampling and treatment, and in particular to an exhaust gas pretreatment device and an exhaust gas pretreatment method. Background Technology

[0002] Currently, trackless rubber-tired vehicles are explosion-proof special transport vehicles that do not require fixed tracks and rely on rubber tires for propulsion. They are the main transportation tools in underground engineering projects such as mines and tunnels. The emission concentration of engine exhaust from trackless rubber-tired vehicles is a key indicator for assessing the safety and environmental performance of the working environment.

[0003] However, unlike ordinary vehicles, the limited space and inconvenient power supply in the mining environment restrict the size and power supply of the testing equipment.

[0004] Therefore, for exhaust emission testing of trackless rubber-wheeled vehicles, how to reduce the size of the equipment and the dependence on power supply has become an urgent technical problem to be solved. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to reduce the size of the equipment and reduce the dependence on power supply for exhaust emission testing of trackless rubber-wheeled vehicles.

[0006] To address the aforementioned technical problems, this invention provides an exhaust gas pretreatment device and an exhaust gas pretreatment method.

[0007] In a first aspect, the present invention provides an exhaust gas pretreatment device, comprising: an exhaust gas passage, wherein an inlet check valve is installed at the inlet of the exhaust gas passage and the inlet of the exhaust gas passage is connected to an exhaust gas source, and an outlet check valve is installed at the outlet of the exhaust gas passage; a permeation chamber, one end of the permeation chamber being connected to the outlet of the exhaust gas passage, wherein a water-removing permeation membrane is fixed inside the permeation chamber, and the other end of the permeation chamber is used to discharge the pretreated exhaust gas; and a manually operated elastic chamber, which is connected to the middle of the exhaust gas passage and is used to draw the exhaust gas into the exhaust gas passage under external compression and pump the exhaust gas out to the permeation chamber.

[0008] In one embodiment, the manual elastic air chamber includes an airbag shell, an airbag, a push slider, a positioning shaft, and a return spring; one end of the airbag shell is open, the airbag and several positioning shafts are installed inside the airbag shell, the positioning shafts are parallel to the extension and retraction direction of the airbag, the return spring is sleeved on the positioning shaft, the push slider is installed at the open end of the airbag shell, one end of the airbag abuts against the inner wall of the airbag shell, the other end of the airbag abuts against the push slider, and the end of the airbag away from the push slider is provided with an air inlet and outlet, which are connected to the middle of the exhaust gas channel.

[0009] In one embodiment, a rack is fixedly connected to the sliding block, the length direction of the rack is parallel to the sliding direction of the sliding block, the rack meshes with a spur gear, the spur gear drives a first rotating shaft to rotate through a ratchet mechanism, the first rotating shaft is provided with a first bevel gear, the first bevel gear meshes with a second bevel gear, the second bevel gear is fixed on a second rotating shaft, the second rotating shaft is provided with a negative pressure fan blade; the rack and spur gear are located outside the exhaust gas passage, the first bevel gear, the second bevel gear and the negative pressure fan blade are located inside the exhaust gas passage, the first rotating shaft is rotatably connected to the motor frame, and the motor frame forms a seal with the side wall of the exhaust gas passage.

[0010] In one embodiment, the second rotating shaft is also provided with a water-splashing fan blade, which is located near the air outlet check valve, and the negative pressure fan blade is located near the air inlet check valve.

[0011] In one embodiment, a water storage box is provided below the permeation chamber, and the water storage box is connected to the permeation chamber.

[0012] In one embodiment, the water-removing permeation membrane is tubular, with one end of the membrane being flared and the other end being constricted. The flared end is fixed at one end of the permeation chamber near the exhaust gas passage, and the constricted end is fixed at the other end of the permeation chamber.

[0013] In one embodiment, the airbag is a corrugated tubular airbag.

[0014] In one embodiment, the intake check valve and the exhaust check valve are flexible check valves.

[0015] In one embodiment, the exhaust gas pretreatment device according to claim 1 is characterized in that the opening pressure of the inlet check valve and the outlet check valve is less than or equal to 1 kPa.

[0016] A second aspect of the present invention provides a method for pre-treating exhaust gas, the method comprising: S1, squeezing a manually operated elastic air chamber to discharge gas in the exhaust gas channel through an outlet check valve to create a negative pressure environment; S2, releasing the manually operated elastic air chamber, allowing exhaust gas to enter the exhaust gas channel through an inlet check valve under negative pressure; S3, squeezing the manually operated elastic air chamber again to discharge exhaust gas in the exhaust gas channel through an outlet check valve to a permeation chamber, creating a negative pressure environment; S4, pre-treating the exhaust gas through a water-removing permeation membrane, and exporting the pre-treated exhaust gas from the other end of the permeation chamber; S5, determining whether the pre-treated exhaust gas collected from the other end of the permeation chamber is sufficient; if sufficient, stopping the exhaust gas pre-treatment device; if insufficient, repeating steps S2-S4.

[0017] Compared with the prior art, the exhaust gas pretreatment device and method of this invention have the following advantages: By compressing the manually operated elastic air chamber to reduce the volume within the exhaust gas passage, and coordinating with the exhaust one-way valve to discharge gas, a negative pressure is created within the exhaust gas passage. Upon release, the manually operated elastic air chamber rebounds, and the negative pressure environment opens the intake one-way valve, allowing the exhaust gas to be treated to enter. Repeated compression discharges the exhaust gas to the permeation chamber, where water vapor in the exhaust gas passes through the dehydration permeation membrane and dissipates. The remaining gas is discharged and collected as pre-treated exhaust gas. Using a manually operated elastic air chamber instead of a motor reduces dependence on power. Compared to methods such as electric heating and condensation for water removal, using a dehydration permeation membrane significantly reduces power dependence and does not introduce other impurities. This is suitable for exhaust emission testing in trackless rubber-wheeled vehicles in environments with limited power supply, such as underground mines. The manual mechanism is compact and easy to transport from the ground downwards. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an exhaust gas pretreatment device exemplarily shown in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the internal structure of the manual elastic air chamber of an exhaust gas pretreatment device, as exemplarily shown in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram illustrating the gear and rack meshing of an exhaust gas pretreatment device according to an exemplary embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the internal structure of the exhaust gas passage of an exhaust gas pretreatment device, as exemplarily shown in an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the internal structure of the permeation chamber of an exhaust gas pretreatment device, as exemplarily shown in an embodiment of the present invention.

[0023] Figure 6 This is a schematic flowchart illustrating an exhaust gas pretreatment method according to an embodiment of the present invention.

[0024] Figure label: 1. Manually operated elastic air chamber; 2. Exhaust gas passage; 3. Permeation chamber; 4. Water storage box; 5. Inlet one-way valve; 6. Outlet one-way valve; 101. Airbag shell; 102. Airbag; 103. Press slider; 104. Positioning shaft; 105. Return spring; 201. Spur gear; 202. Ratchet mechanism; 203. Rack; 204. First bevel gear; 205. First rotating shaft; 206. Second bevel gear; 207. Second rotating shaft; 208. Negative pressure fan blade; 209. Water-spraying fan blade; 210. Motor frame; 301. Water removal and permeation membrane; 302. First chamber; 303. Second chamber; 3011. Flared opening; 3012. Narrowed opening. Detailed Implementation

[0025] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0026] It should be understood that although the terms first, second, third, etc., may be used in this invention to describe various shafts, these shafts should not be limited to these terms. These terms are only used to distinguish shafts of the same type from each other. For example, a first shaft may also be referred to as a second shaft without departing from the scope of this invention, and similarly, a second shaft may also be referred to as a first shaft. Depending on the context, the word "if" as used herein can be interpreted as "when," "when," or "in response to determination."

[0027] Currently, trackless rubber-tired vehicles are a type of explosion-proof special transport vehicle that does not require the laying of fixed tracks and relies on rubber tires to travel. They are the main transport tools in underground engineering projects such as mines and tunnels.

[0028] Controlling harmful gases in mines is more stringent than in conventional environments. Detecting the concentration of engine exhaust emissions is a key indicator for assessing the safety and environmental performance of the working environment. Excessive emissions can seriously threaten the health of underground workers and damage the underground ecosystem. Therefore, accurate detection of exhaust emission concentrations is crucial.

[0029] During exhaust gas testing, due to the high humidity and poor ventilation in underground environments such as mines and tunnels, the exhaust gas from the trackless rubber-wheeled vehicle engine carries a large amount of water vapor. If this water vapor directly enters the testing module, it will cause the detection sensor to become damp, reduce its sensitivity, or even damage the detection components, seriously affecting the accuracy and reliability of the exhaust gas emission concentration detection data, and also shortening the service life of the testing equipment.

[0030] Therefore, effective pretreatment must be carried out before the exhaust gas is formally tested, and water removal pretreatment is one of the core steps.

[0031] In existing exhaust gas pretreatment technologies, water removal pretreatment mainly adopts methods such as condensation water removal and adsorption water removal. Condensation water removal requires the use of cooling devices to achieve water vapor liquefaction and separation, while adsorption water removal relies on adsorbents to adsorb water vapor. However, these existing water removal pretreatment devices are often complex in structure and large in size, and some devices require additional power to drive cooling or adsorption regeneration, which increases the energy consumption and size of the equipment.

[0032] However, unlike ordinary vehicles, the mining environment is characterized by limited space and inconvenient power supply, which restricts the size and power supply of testing equipment. Existing testing equipment not only struggles to meet the miniaturization requirements, but its accompanying pretreatment devices further increase the equipment size and power load.

[0033] Therefore, for exhaust emission testing of trackless rubber-wheeled vehicles, how to reduce the size of the equipment and the dependence on power supply while achieving effective exhaust pretreatment has become an urgent technical problem to be solved.

[0034] Therefore, such as Figure 1 As shown, a preferred embodiment of the present invention provides an exhaust gas pretreatment device, which includes an exhaust gas channel 2, a permeation chamber 3, and a manually operated elastic gas chamber 1.

[0035] An intake check valve 5 is installed at the inlet of exhaust gas passage 2, which is connected to the exhaust gas source. An outlet check valve 6 is installed at the outlet of exhaust gas passage 2. Figure 5 As shown, one end of the permeation chamber 3 is connected to the outlet of the exhaust gas channel 2. A water-removing permeation membrane 301 is fixed inside the permeation chamber 3. The other end of the permeation chamber 3 is used to export the pretreated exhaust gas. The manual elastic air chamber 1 is connected to the middle of the exhaust gas channel 2. The manual elastic air chamber 1 is used to draw the exhaust gas into the exhaust gas channel 2 under external compression and pump the exhaust gas out to the permeation chamber 3.

[0036] It is understandable that the operating temperature of the water removal membrane 301 is lower than that of conventional exhaust gas. However, due to the explosion-proof requirements of trackless rubber-wheeled vehicles in mines, their exhaust gas undergoes explosion-proof treatment before emission. The explosion-proof treatment reduces the exhaust gas temperature, and the reduced exhaust gas temperature falls within the operating temperature range of the water removal membrane 301. This invention cleverly utilizes this point by applying the water removal membrane 301 to the exhaust gas pretreatment of trackless rubber-wheeled vehicles, thus saving on electricity requirements.

[0037] Simultaneously, by squeezing the manual elastic air chamber 1 to reduce the volume of the exhaust gas channel 2, and cooperating with the exhaust one-way valve 6 to discharge gas, a negative pressure is generated in the exhaust gas channel 2. After releasing, the manual elastic air chamber 1 rebounds, and the negative pressure environment causes the intake one-way valve 5 to open, introducing the exhaust gas to be treated. Repeated squeezing can discharge the exhaust gas to be treated to the permeation chamber 3. The water vapor in the exhaust gas to be treated passes through the water removal permeation membrane 301 and is dispersed. The remaining gas is discharged and collected as pretreated exhaust gas. Using the manual elastic air chamber 1 instead of the motor reduces the dependence on power supply.

[0038] The subsequent processing is the same as that for conventional exhaust gas testing, and will not be described in detail here.

[0039] The manual elastic air chamber 1 can be in various shapes, such as the spherical airbag 102 commonly used for air pressure detection.

[0040] Accordingly, the present invention also provides an exemplary structure of a manually operated elastic air chamber 1 to stably achieve exhaust gas treatment. For example... Figure 2 As shown, the manual elastic air chamber 1 includes an airbag shell 101, an airbag 102, a push slider 103, a positioning shaft 104, and a return spring 105.

[0041] One end of the airbag housing 101 is open. The airbag 102 and several positioning shafts 104 are installed inside the airbag housing 101. The positioning shafts 104 are parallel to the extension and retraction direction of the airbag 102. The return spring 105 is sleeved on the positioning shaft 104. The push slider 103 is installed at the open end of the airbag housing 101. One end of the airbag 102 abuts against the inner wall of the airbag housing 101, and the other end of the airbag 102 abuts against the push slider 103. The end of the airbag 102 away from the push slider 103 is provided with an air inlet and outlet, which are connected to the middle of the exhaust gas channel 2.

[0042] With this design, the airbag 102, which is the main part, is placed inside the airbag shell 101 and is equipped with a positioning shaft 104. Therefore, the direction and compression amount are specific each time it is pressed. Due to the limitation of the airbag shell 101, each rebound also rebounds to the designated position. This makes the amount of inhaled gas and the amount of exhaled gas more uniform with each press, thereby controlling the gas flow to the permeation chamber 3 to be more uniform, so as to better cooperate with the work of the water removal permeation membrane 301, maximize the utilization of the water removal permeation membrane 301's water removal capacity, and avoid overload at one time and insufficient air supply at another time.

[0043] Moreover, compared to self-rebound, the return spring 105 can quickly rebound to the initial state, which means that the exhaust gas can be quickly introduced into the exhaust gas channel 2 so as to quickly enter the next cycle of gas supply, reduce the working interval, and improve the uniformity of gas flow.

[0044] Furthermore, in order to increase the conveying pressure and promote the collision between the exhaust gas to be treated and the water removal membrane 301, in one embodiment of the present invention, as follows: Figure 3 As shown, a rack 203 is fixedly connected to the movable slider 103. The length direction of the rack 203 is parallel to the sliding direction of the movable slider 103. The rack 203 meshes with a spur gear 201. The spur gear 201 drives the first rotating shaft 205 to rotate through a ratchet mechanism 202. Figure 4 As shown, a first bevel gear 204 is provided on the first rotating shaft 205, and the first bevel gear 204 meshes with a second bevel gear 206. The second bevel gear 206 is fixed on the second rotating shaft 207, and the second rotating shaft 207 is provided with a negative pressure fan blade 208. The rack 203 and the spur gear 201 are located outside the exhaust gas passage 2, and the first bevel gear 204, the second bevel gear 206 and the negative pressure fan blade 208 are located inside the exhaust gas passage 2. The first rotating shaft 205 is rotatably connected to the motor frame 210, and the motor frame 210 forms a seal with the side wall of the exhaust gas passage 2.

[0045] Because the direction of each press is defined by the positioning shaft 104, the direction of the press is stable and controllable. After connecting the rack 203, the movement direction and stroke of the rack 203 are also controllable.

[0046] Based on this, the rack 203 drives the spur gear 201 to rotate, and the spur gear 201 drives the first bevel gear 204, which is coaxial and located in the exhaust gas passage 2, to rotate. The first bevel gear 204 and the second bevel gear 206 form a reversing mechanism, which changes the rotation of the vertical exhaust gas passage 2 into a rotation coaxial with the axis of the exhaust gas passage 2. By setting the negative pressure fan blade 208, it can play a role in promoting airflow exchange.

[0047] It is understood that the negative pressure fan blade 208 required in this invention is to guide the airflow from the intake one-way valve 5 to the one-way valve. Therefore, its rotation direction depends on the shape of its fan blade. Accordingly, the ratchet mechanism 202 can utilize both the progress and return strokes of the rack 203.

[0048] The rack 203, ratchet, and negative pressure fan blade 208 form multiple adjustable variables and have various combinations. No matter how any variable changes, as long as the negative pressure fan blade 208 can guide the airflow from the intake one-way valve 5 to the one-way valve, it falls within the protection scope of this invention.

[0049] The structures provided in the accompanying drawings of this invention are merely illustrative. In actual products, gear guards can be used to protect structures such as gear racks 203. This invention omits this conventional structure for ease of understanding, but this does not mean that this conventional structure or other conventional structures cannot be applied to this invention.

[0050] In addition, the present invention provides further embodiments to improve the efficiency of airflow exchange. For example, in one embodiment, a water-spraying fan blade 209 is provided on the second rotating shaft 207. The water-spraying fan blade 209 is located near the outlet one-way valve 6, and the negative pressure fan blade 208 is located near the inlet one-way valve 5.

[0051] The negative pressure fan blade 208 is responsible for pushing the airflow into the exhaust gas channel 2, while the water-splashing fan blade 209 is responsible for pressing the airflow from the exhaust gas channel 2 into the permeation chamber 3, pushing the exhaust gas to collide with the water removal permeation membrane 301, improving the water molecule permeation efficiency and improving the water removal effect.

[0052] Furthermore, when the moisture in the exhaust gas to be treated condenses into liquid water in the exhaust gas channel 2 due to the large temperature difference, the water-spinning fan blade 209 is also used to directly spin the moisture onto the water removal permeation membrane 301 to achieve the water removal effect.

[0053] It is understandable that the water-spraying fan blade 209 and the negative pressure fan blade 208 are coaxial and both drive the exhaust gas into the permeation chamber 3, so the fan blades of the water-spraying fan blade 209 and the negative pressure fan blade 208 have similar shapes.

[0054] Considering the possibility of liquid water, in one embodiment of the present invention, a water storage box 4 is provided below the permeation cavity 3, and the water storage box 4 is connected to the permeation cavity 3.

[0055] The water storage box 4 is connected to the permeation chamber 3. When the water passing through the water permeation membrane condenses into liquid water, it can flow into the water storage box 4. The water storage box 4 and the permeation chamber 3 can be designed to be detachably connected, which makes it easy to empty the liquid water in the water storage box 4, reduce the chance of liquid water contacting the water removal permeation membrane 301, and maintain the good permeation capacity of the water removal permeation membrane 301.

[0056] When setting up a disassembly structure, in order to reduce the leakage of liquid water, a sealing structure, such as a sealing ring or sealing ring, can be set at the disassembly interface.

[0057] To balance the efficiency of exhaust gas flow and the water removal efficiency of the water-removing membrane 301, such as Figure 5 As shown, in one embodiment of the present invention, the water removal permeation membrane 301 is tubular, with one end of the water removal permeation membrane 301 being an flared end 3011 and the other end being a constricted end 3012. The flared end 3011 is fixed at one end of the permeation chamber 3 near the exhaust gas channel 2, and the constricted end 3012 of the water removal permeation membrane 301 is fixed at the other end of the permeation chamber 3.

[0058] When the exhaust gas enters the permeation chamber 3, the inner diameter of the tubular structure of the water removal permeation membrane 301 gradually contracts, gathering the exhaust gas and colliding with the side wall of the water removal permeation membrane 301. Combined with the water-spraying fan blade 209, pressure is generated, pushing the water in the exhaust gas through the water removal permeation membrane 301 into the water storage box 4.

[0059] Understandably, when the water-spinning fan blade 209 is working, the resulting cyclone travels along the inner wall, and the exhaust gas also presents an almost hollow effect. The tubular water-removing permeation membrane 301 perfectly matches the shape of the exhaust gas.

[0060] like Figure 5 As shown, since the flared end 3011 of the water-removing permeation membrane 301 experiences greater force while the constricted end 3012 experiences almost no force, in one embodiment, the permeation chamber 3 can be divided into two parts: a first chamber 302 and a second chamber 303. The first chamber 302 is a cylindrical cavity with one open end and a through hole at the other end for discharging pretreated exhaust gas. The second chamber 303 is a perforated circular plate. The second chamber 303 presses against the edge of the flared end 3011 of the water-removing permeation membrane 301 and abuts against the first chamber 302, thereby fixing the water-removing permeation membrane 301.

[0061] It is understood that this fixing structure is merely exemplary, and those skilled in the art can use other fixing methods, all of which fall within the protection scope of this invention.

[0062] Furthermore, through repeated use and testing, the inventors discovered that the folding path of the airbag 102 is irregular when it is compressed. For example, when it was pressed last time, the airbag 102 formed a crease at one-third of the way, while when it was pressed this time, the crease may appear at one-quarter or one-half of the way, which is somewhat random. Such randomness will cause some airflow fluctuations.

[0063] To eliminate this error, in a further embodiment of the invention, the airbag 102 may be a corrugated tubular airbag 102.

[0064] The corrugated tubular airbag 102 has multiple pre-set creases. When compressed, the folding of the corrugated tubular airbag 102 always occurs at the pre-set creases, so that the amount of exhaust gas entering and exiting the exhaust pipe is always constant each time it is pressed and rebounded, thereby reducing airflow fluctuations and ensuring the stability of the pretreatment effect.

[0065] It is understood that the pressure of the exhaust gas will change after passing through the treatment device of the present invention. In order to reduce the chance of valve jamming, in one embodiment of the present invention, the intake one-way valve 5 and the exhaust one-way valve 6 are flexible one-way valves.

[0066] Exhaust gas has a low emission pressure, which further decreases when it passes through the pretreatment unit. This results in a longer opening time for the one-way valve, causing blockage in the airflow path. Flexible one-way valves, on the other hand, typically open at even lower pressures. Operating in this low-pressure environment, they open more smoothly and quickly, reducing obstruction to the exhaust gas flow.

[0067] It is understood that the level of pressure described in this invention is relative and limited to a specific language scenario of a particular embodiment, and does not follow the strict classification standards in other technical fields.

[0068] In a preferred embodiment, the intake check valve 5 and the exhaust check valve 6 can be selected as check valves with an opening pressure of less than 1 kPa.

[0069] Accordingly, the present invention also provides a method for exhaust gas pretreatment, such as... Figure 6 As shown, exhaust gas pretreatment methods may include: S1. Squeeze the manual elastic air chamber 1 to discharge the gas in the exhaust passage 2 through the exhaust one-way valve 6 to create a negative pressure environment.

[0070] S2. Release the manual elastic air chamber 1, and the exhaust gas enters the exhaust gas passage 2 through the intake one-way valve 5 under negative pressure.

[0071] S3. Squeeze the manual elastic air chamber 1 again to discharge the exhaust gas in the exhaust gas passage 2 from the exhaust one-way valve 6 to the permeation chamber 3 and form a negative pressure environment.

[0072] S4. The exhaust gas is pretreated by the water removal permeation membrane 301, and the pretreated exhaust gas is discharged from the other end of the permeation chamber 3.

[0073] S5. Determine whether the pretreated exhaust gas collected from the other end of the permeation chamber 3 is sufficient; if it is sufficient, stop the exhaust gas pretreatment device; if it is insufficient, repeat steps S2-S4.

[0074] By compressing the manual elastic gas chamber 1 to reduce the volume of the exhaust gas passage 2, and using the outlet check valve 6 to discharge the gas while maintaining a negative pressure state, the inlet check valve 5 is opened to introduce the exhaust gas to be treated. Repeated compression can discharge the exhaust gas to the permeation chamber 3. Water vapor passes through the water removal permeation membrane 301 and dissipates, while the remaining gas is discharged and collected as pretreated exhaust gas.

[0075] It is understood that the exhaust gas pretreatment method of the present invention is applicable to the exhaust gas pretreatment device in any embodiment of the present invention. Therefore, any embodiment, combined embodiment, extended embodiment of the exhaust gas pretreatment device and its beneficial effects are applicable to the exhaust gas pretreatment method of the present invention.

[0076] In summary, this invention provides an exhaust gas pretreatment device and method for testing exhaust emissions from trackless rubber-tired vehicles. The core structure includes a manually operated elastic air chamber, a water-removing permeation membrane, and an airbag. By compressing the manually operated elastic air chamber to reduce the exhaust gas passage volume, and using a one-way valve to maintain negative pressure, uniform gas discharge is achieved. When the exhaust gas enters the permeation chamber, water vapor passes through the water-removing permeation membrane and dissipates, while the remaining gas is collected as pretreated gas. The device employs a corrugated tubular airbag structure to ensure uniform gas flow, while the flexible inlet and outlet one-way valves reduce equipment size and power supply requirements. Furthermore, the airbag structure is optimized to regularize the folding path, reducing airflow fluctuations and improving the pretreatment effect.

[0077] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A tail gas pretreatment device, characterized in that, include: The exhaust gas passage (2) is equipped with an intake check valve (5) at its inlet, and the inlet of the exhaust gas passage (2) is connected to the exhaust gas source. The exhaust gas passage (2) is equipped with an outlet check valve (6) at its outlet. The permeation chamber (3) has one end connected to the outlet of the exhaust gas channel (2), and a water-removing permeation membrane (301) is fixed inside the permeation chamber (3). The other end of the permeation chamber (3) is used to export the pretreated exhaust gas. Manually operated elastic air chamber (1) is connected to the middle part of the exhaust gas channel (2). The manually operated elastic air chamber (1) is used to draw exhaust gas into the exhaust gas channel (2) under external compression and pump the exhaust gas out to the permeation chamber (3).

2. The exhaust gas pretreatment device according to claim 1, characterized in that, The manual elastic air chamber (1) includes an airbag shell (101), an airbag (102), a push slider (103), a positioning shaft (104), and a return spring (105); one end of the airbag shell (101) is open, the airbag (102) and several positioning shafts (104) are installed inside the airbag shell (101), the positioning shafts (104) are parallel to the extension and retraction direction of the airbag (102), and the return spring (105) is sleeved on... On the positioning shaft (104), the push slider (103) is installed on the open end of the airbag shell (101). One end of the airbag (102) abuts against the inner wall of the airbag shell (101), and the other end of the airbag (102) abuts against the push slider (103). The end of the airbag (102) away from the push slider (103) is provided with an air inlet and outlet, which is connected to the middle of the exhaust gas channel (2).

3. The exhaust gas pretreatment device according to claim 2, characterized in that, The push-button slider (103) is fixedly connected to a rack (203). The length direction of the rack (203) is parallel to the sliding direction of the push-button slider (103). The rack (203) meshes with a spur gear (201). The spur gear (201) drives the first rotating shaft (205) to rotate through a ratchet mechanism (202). The first rotating shaft (205) is provided with a first bevel gear (204). The first bevel gear (204) meshes with a second bevel gear (206). 6) Fixed on the second rotating shaft (207), the second rotating shaft (207) is provided with negative pressure fan blades (208); the rack (203) and the spur gear (201) are located outside the exhaust gas channel (2), the first bevel gear (204), the second bevel gear (206) and the negative pressure fan blades (208) are located inside the exhaust gas channel (2), the first rotating shaft (205) is rotatably connected to the motor frame (210), and the motor frame (210) forms a seal with the side wall of the exhaust gas channel (2).

4. The exhaust gas pretreatment device according to claim 3, characterized in that, The second rotating shaft (207) is also provided with a water-spraying fan blade (209), which is located near the air outlet check valve (6), and the negative pressure fan blade (208) is located near the air inlet check valve (5).

5. The exhaust gas pretreatment device according to claim 4, characterized in that, A water storage box (4) is provided below the permeation chamber (3), and the water storage box (4) is connected to the permeation chamber (3).

6. The exhaust gas pretreatment device according to claim 4, characterized in that, The water-removing permeation membrane (301) is tubular, with one end of the water-removing permeation membrane (301) being an flared end (3011) and the other end of the water-removing permeation membrane (301) being a constricted end (3012). The flared end (3011) is fixed to one end of the permeation chamber (3) near the exhaust gas channel (2), and the constricted end (3012) of the water-removing permeation membrane (301) is fixed to the other end of the permeation chamber (3).

7. The exhaust gas pretreatment device according to claim 2, characterized in that, The airbag (102) is a corrugated tubular airbag (102).

8. The exhaust gas pretreatment device according to claim 1, characterized in that, The intake check valve (5) and the exhaust check valve (6) are flexible check valves.

9. The exhaust gas pretreatment device according to claim 1, characterized in that, The opening pressure of the inlet check valve (5) and the outlet check valve (6) is less than or equal to 1 kPa.

10. A method for pretreating exhaust gas, characterized in that, The exhaust gas pretreatment method includes: S1. Squeeze the manual elastic air chamber (1) to discharge the gas in the exhaust passage (2) through the exhaust one-way valve (6) to form a negative pressure environment; S2. Release the manual elastic air chamber (1), and the exhaust gas enters the exhaust gas passage (2) through the intake one-way valve (5) under negative pressure. S3. Squeeze the manual elastic air chamber (1) again to discharge the exhaust gas in the exhaust gas passage (2) from the exhaust one-way valve (6) to the permeation chamber (3) and form a negative pressure environment; S4. The exhaust gas is pretreated by passing through a water-removing permeation membrane (301), and the pretreated exhaust gas is discharged from the other end of the permeation chamber (3). S5. Determine whether the pretreated exhaust gas collected from the other end of the permeation chamber (3) is sufficient; if it is sufficient, stop the exhaust gas pretreatment device; if it is insufficient, repeat steps S2-S4.

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