A method of tail gas treatment

Abstract

The application provides a tail gas treatment method, comprising a tail gas treatment device, which is provided with a flap valve, an oil filter layer, a water filter layer and a one-way valve. A wind guide tube guides wind to a dust suction filter cylinder. A dust brush is arranged opposite to the dust suction filter cylinder in a sealed cabin. A dust collection bag is arranged outside the sealed cabin. The bottom of the sealed cabin is communicated with the dust collection bag. A fan is communicated with the dust suction filter cylinder and arranged outside the sealed cabin. An air outlet pipe is connected to the outlet of the fan. A wind pressure detector is arranged in the air outlet pipe. The dust suction filter cylinder is further provided with an inclined partition. The flap valve, the fan and the wind pressure detector are respectively controlled by an intelligent control module. The fan is a forward and reverse fan. Forward air suction and reverse air blowing can both rotate the dust suction filter cylinder. The surface of the filter cylinder is brushed by the dust brush when the filter cylinder rotates. The device can be self-cleaned while treating tail gas. When the device fails, the device can avoid tail gas backflow damage to the engine. The device can be further self-cleaned by using the fan reverse blowing. The device is intelligently controlled, easy to use and cost-saving.

Description

Technical Field

[0001] This invention relates to exhaust gas purification and treatment, and more specifically, to an exhaust gas treatment method. Background Technology

[0002] This invention is a divisional application of the original application number: 201810380947.8, application date: 2018.04.25, entitled "An exhaust gas treatment device with self-cleaning function".

[0003] The increasing number of cars, while bringing convenience, also pollutes the atmosphere and impacts the living environment. Especially during tunnel construction, exhaust fumes from equipment inside the tunnel cannot be quickly and effectively discharged, severely deteriorating the working environment, reducing efficiency, and endangering personnel health. Therefore, exhaust gas treatment is particularly important. Existing automotive exhaust systems mainly use catalytic reduction reactions to convert toxic and harmful gases such as carbon monoxide, nitrogen oxides, and nitrogen-hydrogen compounds into harmless substances like carbon dioxide and water, which are then released into the air. However, due to the use of fuel or lubricating oil, the conversion efficiency of the catalytic reduction reaction decreases, and oily particles and carbon particles cannot be adequately filtered. Furthermore, while some external exhaust gas filters can further purify exhaust gases, they lack consideration for preventing exhaust gas from flowing back into the engine, self-cleaning processes, and ensuring the original system continues to function normally when the filter malfunctions. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and provides an exhaust gas treatment method, which is expected to solve the problem that external exhaust gas treatment devices cannot self-clean during use, causing device malfunctions, and that exhaust gas flows back to the engine, causing the original exhaust gas treatment system of automobiles and other products to malfunction.

[0005] To solve the above-mentioned technical problems, one embodiment of the present invention adopts the following technical solution:

[0006] A self-cleaning exhaust gas treatment device includes an exhaust pipe, a guide duct, a dust collection filter cartridge, a fan, a sealed chamber, and an intelligent control module. The exhaust pipe has a bend at its end, with a flap valve installed on the outside. An oil filter layer and a water filter layer are sequentially arranged from top to bottom inside the bend. The bend connects to the guide duct, and a one-way valve is installed at the connection point. The other end of the guide duct faces the dust collection filter cartridge, which is horizontally positioned along its central axis. Both the guide duct and the dust collection filter cartridge are housed within the sealed chamber. A dust brush is installed inside the sealed chamber facing the dust collection filter cartridge. A dust collection bag is installed outside the sealed chamber, with the bottom of the sealed chamber communicating with the dust collection bag. The fan is located outside the sealed chamber. The system connects to the dust collection filter cartridge via a connecting duct, and the fan outlet is connected to an outlet duct. An air pressure detector is installed inside the outlet duct. The dust collection filter cartridge includes an outer filter layer and an inner filter layer arranged coaxially. Several baffles are inclinedly arranged between the outer and inner filter layers. The flap valve, fan, and air pressure detector are controlled by an intelligent control module. The fan is a forward and reverse fan. When the fan blows air in the forward direction, the airflow in the duct blows the baffles, causing the dust collection filter cartridge to rotate automatically. At the same time, a dust brush washes the surface of the dust collection filter cartridge. When the fan blows air in the reverse direction, the airflow in the connecting duct blows the baffles, causing the dust collection filter cartridge to rotate automatically. At the same time, a dust brush washes the surface of the dust collection filter cartridge.

[0007] The vacuum filter cartridge of the aforementioned exhaust gas treatment device with self-cleaning function has a set of fan blades fixed at both ends of its internal cavity.

[0008] The dust collection filter cartridge of the aforementioned exhaust gas treatment device with self-cleaning function is positioned by being connected to the sealed chamber by a bearing. The bearing and the dust collection filter cartridge are movably connected, and the dust collection filter cartridge can rotate around the bearing.

[0009] The dust collection filter cartridge of the aforementioned exhaust gas treatment device with self-cleaning function is movably connected to the connecting air duct, and the dust collection filter cartridge can rotate around the connecting air duct.

[0010] The dust collection bag is made of filter cloth.

[0011] In the aforementioned exhaust gas treatment device with self-cleaning function, the oil filter layer is a mesh structure layer that is detachably installed in the bend pipe, and the oil filter layer contains oil mist removal material.

[0012] In the aforementioned exhaust gas treatment device with self-cleaning function, the water filter layer is a mesh structure layer that is detachably installed in the bend pipe, and the water filter layer is made of water-absorbing material.

[0013] In the aforementioned exhaust gas treatment device with self-cleaning function, the intelligent control module stores a wind pressure threshold. When the wind pressure detector detects that the wind pressure in the air outlet duct is lower than the threshold, the intelligent control module controls the flap valve to open and simultaneously controls the fan to blow air in reverse.

[0014] This device can be installed on the exhaust systems of automobiles and other products. Through the combined action of two filtration zones, it further cleans the exhaust gas, filtering out oily particles, water vapor, and carbon particles, making the exhaust gas cleaner and more environmentally friendly. While purifying the exhaust gas, the device can also self-clean the dust collection filter cartridge, ensuring that the exhaust gas purification effect remains good. In addition, the device has a system emergency protection function. When the wind pressure detector detects that the air pressure in the exhaust duct is lower than the threshold, the system emergency protection function can be activated to prevent exhaust gas from flowing back into the engine, thus avoiding damage to the car engine and exhaust system in the event of a device malfunction.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] 1. Self-cleaning of the dust collection filter cartridge during operation. This invention cleverly achieves the purpose of self-rotation of the dust collection filter cartridge and self-cleaning of the outer wall of the filter cartridge by setting up a negative pressure fan, dust brush, air guide duct structure and dust collection filter cartridge partition angle.

[0017] 2. Fan Backflushing Self-Cleaning. When the dust filter cartridge becomes clogged, the fan blows air into the cartridge, carrying some of the dust out and allowing it to be filtered through the dust collection bag. This process, driven by the airflow propelling the fan blades and rotating the filter cartridge, along with the action of the dust brush, further achieves self-cleaning, extending the filter cartridge's lifespan and improving suction efficiency.

[0018] 3. Intelligent Control. The system connects a fan, air pressure detector, flap valve, and intelligent control module. When the air pressure detector detects that the air pressure is lower than a preset value, the intelligent control flap valve opens, allowing exhaust gas to be directly discharged into the atmosphere, ensuring the original system functions normally. The one-way valve effectively controls the backflow of exhaust gas after entering the filter cartridge, preventing damage to the engine.

[0019] 4. This device can be used continuously for a long time without manual cleaning, saving costs. Attached Figure Description

[0020] Figure 1 A schematic diagram of the exhaust gas treatment device with self-cleaning function of the present invention in normal working condition.

[0021] Figure 2 This is a schematic diagram of the exhaust gas treatment device with self-cleaning function of the present invention when it enters the system protection state.

[0022] Figure 3 This is a cross-sectional schematic diagram of the dust collection filter cartridge of an exhaust gas treatment device with self-cleaning function. Detailed Implementation

[0023] 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 merely illustrative and not intended to limit the invention.

[0024] Under normal operating conditions, the exhaust gas treatment device with self-cleaning function works in conjunction with the exhaust gas treatment system of automobiles and other products to further purify the exhaust gas. Its structure is as follows: Figure 1 As shown. The device includes an exhaust pipe 1, a duct 7, a dust collection filter cartridge 8, a fan 10, a sealed chamber 16, and an intelligent control module. A bend 2 is installed at the end of the exhaust pipe 1, and a flap valve 3 is installed on the outside of the bend 2. Under normal operating conditions, the flap valve 3 is closed, ensuring an airtight connection between the exhaust pipe, the bend, and the duct. The first filtration zone is located inside the end of the bend 2. This filtration zone consists of an oil filter layer 4 and a water filter layer 5, arranged sequentially from top to bottom. The oil filter layer is a mesh structure layer, detachably installed in the bend, and contains de-mist material. The water filter layer is also a mesh structure layer, detachably installed in the bend, and is made of absorbent material. Both the de-mist material and the absorbent material are commercially available. When the exhaust gas passes through the bend, most of the oily substances and water vapor are filtered out. The dust collection filter cartridge is the second filtration zone, primarily filtering carbon particles and other dust. The end of the bend 2 connects to the air guide duct 7, and a one-way valve 6 is installed at the connection point. The air guide duct 7 directs the air from the exhaust pipe to the dust collection filter cartridge 8. The one-way valve 6 only allows exhaust gas to enter the air guide duct from the exhaust pipe, but does not allow exhaust gas to flow back into the exhaust pipe from the air guide duct. Backflow of exhaust gas can enter the engine and damage it. The one-way valve can prevent exhaust gas from flowing back into the engine, especially when the dust collection filter cartridge becomes clogged after long-term use, thus preventing exhaust gas from damaging the engine. The other end of the air guide duct 7 is directly opposite the filter layer on the dust collection filter cartridge 8, which is horizontally positioned along its central axis. Figure 3As shown, the dust collection filter cartridge 8 includes an outer filter layer 17 and an inner filter layer 18 arranged coaxially. Several baffles 19 are inclinedly arranged between the outer filter layer 17 and the inner filter layer 18. The inclination angle of the baffles 19 can be adjusted according to the exhaust gas force. The inclination angle should be such that when the baffles 19 are blown by the exhaust gas, they can drive the dust collection filter cartridge to rotate. Simultaneously, when the fan blows air in the opposite direction, the airflow hitting the baffles 19 can also cause the dust collection filter cartridge to rotate. A set of fan blades 20 can be fixed to each end of the cavity inside the dust collection filter cartridge 8. These fan blades 20 are used to increase the driving force of the airflow when the fan blows air in the opposite direction, driving the dust collection filter cartridge to rotate in the opposite direction. The fan blades can be selectively arranged as needed. Both the air guide duct 7 and the dust collection filter cartridge 8 are housed in the sealed chamber 16. The function of the sealed chamber is to prevent exhaust gas from being discharged into the atmosphere without passing through the dust collection filter cartridge, and the sealed chamber also serves to collect dust particles such as carbon particles. Inside the sealed chamber, a dust brush 13 is positioned directly opposite the dust filter cartridge. The dust brush is aligned with the axis of the dust filter cartridge, and its length is approximately equal to the length of the cartridge. The dust brush can be positioned below the dust filter cartridge and fixed to the sealed chamber. When the dust filter cartridge rotates, the dust brush cleans its surface, sweeping away solid particles such as carbon particles. A dust collection bag 14 is located outside the sealed chamber, with the bottom of the chamber communicating with it. Dust particles such as carbon particles in the sealed chamber can leak into the dust collection bag. The dust collection bag is made of filter cloth with a certain degree of porosity, which prevents dust particles such as carbon particles from leaking out while allowing air to pass through. The air permeability of the filter cloth can be controlled by selectively adjusting the pore size. The fan 10 is located outside the sealed chamber 16 and is connected to the dust collection filter cartridge 8 via the connecting duct 9. The fan is a reversible fan, capable of both forward and reverse airflow. During normal operation, the fan draws air in the forward direction; when the system enters protection mode, the fan reverses airflow. The fan outlet is connected to the outlet duct 11, and a wind pressure detector 12 is installed inside the outlet duct. The flap valve 3, fan 10, and wind pressure detector 12 are controlled separately by an intelligent control module. The dust collection filter cartridge is positioned on the sealed chamber by a bearing 15. The bearing and the dust collection filter cartridge are movably connected, allowing the dust collection filter cartridge to rotate around the bearing. The dust collection filter cartridge is also movably connected to the connecting duct, allowing the dust collection filter cartridge to rotate around the connecting duct. Figure 1 The intelligent control module is not shown. Figure 2This is a schematic diagram of the device during system protection. The intelligent control module stores wind pressure thresholds. When the wind pressure detector detects that the wind pressure in the outlet duct is lower than the threshold, the intelligent control module controls the flap valve to open and simultaneously controls the fan to blow air in reverse, causing the dust collection filter cartridge 8 to rotate in reverse. A wind pressure in the outlet duct lower than the threshold indicates a blockage in the device and a blockage in the exhaust pipe 1. Opening the flap valve allows the exhaust gas in the exhaust pipe 1 to bypass the device and be directly discharged into the atmosphere, preventing backflow into the engine. The fan's reverse blowing causes the dust collection filter cartridge to rotate in reverse, and the dust brush sweeps the dust collection filter cartridge in reverse to further remove particulate matter. Furthermore, the fan blowing causes the dust adsorbed on the dust collection filter cartridge to be carried by the airflow into the sealed chamber, where it is then collected by the dust collection bag. The dust collection bag has a certain degree of permeability, allowing the gas in the sealed chamber to be discharged into the atmosphere from there. When the fan blows air in reverse, the one-way valve prevents the gas in the sealed chamber from flowing back into the exhaust pipe and damaging the engine.

[0025] The device described in this application can be installed at the rear of a vehicle, but is not limited to use on vehicles. This device can be used in various types of exhaust gas treatment equipment.

[0026] The working principle of this application is as follows: Under normal conditions, a fan is used to draw air in, creating a negative pressure in the dust collection filter cartridge. The exhaust gas from the exhaust pipe is sequentially drawn into the oil filter layer and the water filter layer. After the exhaust gas is de-oiled and dried, it is then guided into the dust collection filter cartridge through a one-way valve and an air guide pipe. The dust collection filter cartridge is equipped with multiple layers of filter screens and various adsorption and filtration media. The airflow is transmitted to the baffles of the dust collection filter cartridge. Since the baffles are set at a certain angle, it can ensure that the airflow drives the dust collection filter cartridge to rotate. Therefore, the airflow enters the dust collection filter cartridge and is filtered. Carbon particles are adsorbed and filtered on the surface of the dust collection filter cartridge. The cleaned gas is discharged through the air outlet pipe. During the rotation of the dust collection filter cartridge, it is cleaned by the dust brush placed at the bottom and collected into the dust collection bag. The intelligent control module has a pre-set control program. When the air pressure detector detects that the air pressure in the exhaust duct is lower than the preset value (threshold), it indicates that the device is blocked, and there will inevitably be air trapped in the exhaust pipe, posing a risk of exhaust gas backflow into the engine and damaging it. At this time, the intelligent control module opens the flap valve, allowing the exhaust gas to be directly discharged into the atmosphere from the flap valve. Simultaneously, the intelligent control module starts the fan to blow air in reverse. The airflow drives the filter cartridge to rotate through the fan blades (the fan blades are optional; if the fan blades are not installed, the tilt angle of the baffle and the airflow of the fan should be adjusted to ensure that the filter cartridge rotates). The back-blown air, after passing through the dust collection filter cartridge, contains a large amount of dust and other impurities. When the airflow is discharged from the dust collection bag, it carries the dust into the dust collection bag. The dust collection bag prevents dust from flowing into the atmosphere but allows clean air to pass through. The one-way valve prevents the back-blown airflow from flowing back into the exhaust pipe and damaging the engine. This design allows the dust collection filter cartridge to self-repair, effectively extending the service life of the dust collection filter cartridge. The intelligent control module can set the reverse airflow time of the fan. After the set reverse airflow time is reached, the intelligent control module closes the flap valve again and starts the fan for forward airflow. If the air pressure detector still detects that the air pressure is below the threshold, the above steps are repeated until the device can purify the exhaust gas normally. The connection between the air duct, the dust collection filter cartridge, and the fan is a sealed connection to ensure that the airflow during reverse airflow can carry the dust off the dust collection filter cartridge and into the dust collection bag.

[0027] Although the invention has been described herein with reference to illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of this disclosure. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A method for treating exhaust gas, characterized in that, The treatment method is implemented using a tail gas treatment device with self-cleaning function. The tail gas treatment device includes a tail gas pipe (1), a guide tube (7), a dust collection filter (8), a fan (10), a sealed chamber (16), and an intelligent control module. The tail gas pipe (1) is equipped with a bend (2) at the end. A flap valve (3) is installed on the outside of the bend (2). An oil filter layer (4) and a water filter layer (5) are arranged from top to bottom inside the end of the bend (2). The end of the bend is connected to the guide tube (7). A one-way valve (6) is installed at the connection between the two. The other end of the guide tube (7) is directly opposite the dust collection filter (8). The dust collection filter (8) is set horizontally along its central axis. The guide tube (7) and the dust collection filter (8) are both set in the sealed chamber (16). A dust brush (13) is set inside the sealed chamber directly opposite the dust collection filter. A dust collection bag (14) is set outside the sealed chamber. The bottom of the sealed chamber is connected to the dust collection bag. The fan (10) 0) Set outside the sealed chamber (16), connected to the dust collection filter cartridge (8) through the connecting air duct (9), the fan outlet is connected to the air outlet duct (11), and the air pressure detector (12) is installed in the air outlet duct; the dust collection filter cartridge (8) includes a filter cartridge outer layer (17) and a filter cartridge inner layer (18) arranged coaxially, and several partitions (19) are inclinedly arranged between the filter cartridge outer layer and the filter cartridge inner layer. The flap valve (3), the fan (10) and the air pressure detector (12) are controlled by the intelligent control module respectively; the fan (10) is a forward and reverse fan. When the fan blows air in the forward direction, the airflow in the air duct blows the partitions (19) to drive the dust collection filter cartridge (8) to rotate automatically, and at the same time the dust brush (13) washes the surface of the dust collection filter cartridge (8). When the fan blows air in the reverse direction, the airflow in the connecting air duct blows the partitions (19) to drive the dust collection filter cartridge (8) to rotate automatically, and at the same time the dust brush (13) washes the surface of the dust collection filter cartridge (8); The processing method is as follows: Under normal conditions, the fan (10) draws air to form a negative pressure in the dust filter cartridge, and the exhaust gas in the exhaust pipe is sequentially drawn into the oil filter layer and the water filter layer. After the exhaust gas is de-oiled, it is dried and then introduced into the dust filter cartridge by the one-way valve and the air guide pipe. The dust filter cartridge is equipped with multiple layers of filter screens and various adsorption and filtration media. The airflow is transmitted to the partition of the dust filter cartridge. Since the partition is set at a certain angle, it can ensure that the airflow drives the dust filter cartridge to rotate. The airflow enters the dust filter cartridge and is filtered. The gas after the carbon particles adsorbed and filtered on the surface of the dust filter cartridge are cleaned by the air outlet pipe. During the rotation of the dust filter cartridge, it is cleaned by the dust brush placed at the bottom and collected into the dust collection bag. The intelligent control module has a pre-set control program. When the wind pressure detector detects that the air pressure in the exhaust pipe is less than the preset value, it indicates that the exhaust gas treatment device is blocked, and there will inevitably be air trapped in the exhaust pipe. There is a risk that the exhaust gas will backflow into the engine and damage it. At this time, the intelligent control module opens the flap valve, and the exhaust gas is directly discharged into the atmosphere from the flap valve. At the same time, the intelligent control module starts the fan to blow air in reverse. The airflow drives the filter cartridge to rotate through the fan blades. The back-blown air contains dust and impurities after passing through the dust collection filter cartridge. When the airflow is discharged from the dust collection bag, it carries the dust into the dust collection bag. The dust collection bag prevents the dust from flowing into the atmosphere, but allows clean gas to pass through. The one-way valve prevents the back-blown airflow from flowing back into the exhaust pipe and damaging the engine, thereby enabling the dust collection filter cartridge to self-repair. The intelligent control module can set the time for the fan to blow air in reverse. When the reverse blowing reaches the set time, the intelligent control module closes the flap valve again and starts the fan to draw air in forward. If the wind pressure detector still detects that the wind pressure is lower than the threshold, the above steps are repeated until the device can purify exhaust gas normally. The connection between the air duct, the dust collection filter cartridge, and the fan is a sealed connection, ensuring that when the fan blows back, the airflow can carry the dust off the dust collection filter cartridge and into the dust collection bag.

2. The exhaust gas treatment method according to claim 1, characterized in that, A set of fan blades (20) is fixed at each end of the cavity inside the dust collection filter cartridge.

3. The exhaust gas treatment method according to claim 1, characterized in that, The dust filter cartridge is positioned by being connected to the sealed chamber by a bearing (15). The bearing and the dust filter cartridge are movably connected, and the dust filter cartridge can rotate around the bearing.

4. The exhaust gas treatment method according to claim 1, characterized in that, The dust collection filter cartridge and the connecting air duct are movably connected, and the dust collection filter cartridge can rotate around the connecting air duct.

5. The exhaust gas treatment method according to claim 1, characterized in that, The dust collection bag is made of filter cloth.

6. The exhaust gas treatment method according to claim 1, characterized in that, The oil filter layer is a mesh structure layer that is detachably installed in the bend pipe, and contains oil mist removal material.

7. The exhaust gas treatment method according to claim 1, characterized in that, The filter layer is a mesh structure layer that is detachably installed in the bend pipe and is made of absorbent material.

8. The exhaust gas treatment method according to claim 1, characterized in that, The intelligent control module stores wind pressure thresholds. When the wind pressure detector detects that the wind pressure in the air outlet duct is lower than the threshold, the intelligent control module controls the flap valve to open and simultaneously controls the fan to blow air in the opposite direction.

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