An exhaust gas internal circulation filtration system

Abstract

The present invention discloses an internal circulation filtration system for exhaust gas, which relates to the technical field of spray exhaust gas purification, including a spray cabinet, a cyclone centrifugal purification tower, a venturi filter water cabinet and a circulating air cabinet connected in sequence. The exhaust gas performs centrifugal motion in the cyclone centrifugal purification tower, which is used to centrifugally attach solid matter in the exhaust gas to the cyclone centrifugal purification tower. The exhaust gas is subjected to water film filtration in the venturi filter water cabinet to filter solid matter in the exhaust gas. A part of the exhaust gas entering the circulating air cabinet is sent to the spray cabinet through a first air supply port to continue spraying, and the other part is sent to the next treatment system through a second air supply port for treatment. When the present invention separates and filters the solid matter in the exhaust gas generated by spraying, it is mainly completed by wind speed and water, and it is not easy for the channel to be blocked by the solid matter in the exhaust gas. By improving the exhaust gas purification method, the production efficiency is effectively improved while ensuring a good purification effect on the exhaust gas.

Description

Technical Field

[0001] The present invention relates to the technical field of spraying waste gas purification, in particular to a waste gas internal circulation filtering system. Background Art

[0002] As we all know, in terms of environmental protection, the main problem of spraying waste gas is the volatilized solvents and highly dispersed paint mist, which seriously pollute the environment and endanger human health.

[0003] In the treatment of solvents volatilized in spraying waste gas, currently the main methods are activated carbon adsorption and desorption + RCO catalytic combustion, or zeolite wheel + RTO catalytic combustion, so that the solvents volatilized in the spraying waste gas (mainly VOC) are burned through thermal storage oxidation to generate water and carbon dioxide, which can basically solve the pollution of the solvents volatilized in the spraying waste gas to the environment.

[0004] Because the primary pollutants in the highly dispersed paint mist in spray exhaust are solid matter (particulate matter), they are currently primarily treated through filter plates. Continuous innovation has led to the development of multi-layer filtration methods for solid matter. While filter plates are undeniably effective in filtering solid matter, clogging is unavoidable. This means that over a certain period of use, the air intake surface of the filter plate can become covered with large areas of solid matter, significantly reducing the gas flow rate and negatively impacting power consumption. This necessitates regular manual replacement and cleaning of the filter plates, suspending the entire spray exhaust system and slowing production. Therefore, in the treatment of spray exhaust, especially when filtering solid matter from paint mist, there is a constant dilemma between achieving effective filtration and high production efficiency. Summary of the Invention

[0005] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution that can solve the above-mentioned problems.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an exhaust gas internal circulation filtration system, comprising a spray booth, a cyclone centrifugal purification tower, a Venturi filter water cabinet and a circulating air cabinet; the spray booth has a fresh air inlet, a spray return air port and a spray exhaust port; the cyclone centrifugal purification tower has a cyclone air inlet and a cyclone air outlet; the Venturi filter water cabinet has a water cabinet air inlet and a water cabinet air outlet; the circulating air cabinet has an air cabinet air inlet, a first air supply port and a second air supply port; the spray exhaust port of the spray booth is connected to the cyclone air inlet of the cyclone centrifugal purification tower, the cyclone air outlet of the cyclone centrifugal purification tower is connected to the water cabinet air inlet of the Venturi filter water cabinet, the water cabinet air outlet of the Venturi filter water cabinet is connected to the air cabinet air inlet of the circulating air cabinet, and the first air supply port of the circulating air cabinet The outlet is connected to the spray return air outlet of the spray cabinet; the exhaust gas generated by spraying in the spray cabinet is sent to the cyclone centrifugal purification tower through the spray exhaust outlet, and the exhaust gas undergoes centrifugal motion in the cyclone centrifugal purification tower, which is used to centrifugally attach solid matter in the exhaust gas to the cyclone centrifugal purification tower; after completing the centrifugal motion in the cyclone centrifugal purification tower, the exhaust gas reaches the Venturi filter water cabinet through the cyclone air outlet, and the exhaust gas is subjected to water film filtering in the Venturi filter water cabinet to filter solid matter in the exhaust gas; after being subjected to water film filtering in the Venturi filter water cabinet, the exhaust gas reaches the circulating air cabinet through the air cabinet air inlet, and the exhaust gas entering the circulating air cabinet: one part is sent to the spray cabinet through the first air supply port to continue spraying, and the other part is sent to the next treatment system through the second air supply port for treatment.

[0007] As a further solution of the present invention: 80% of the exhaust gas entering the circulating air cabinet is sent to the spray cabinet through the first air supply port for continued spraying, and 20% is sent to the next treatment system through the second air supply port for treatment.

[0008] As a further solution of the present invention: a first fan is provided at the first air supply port of the circulating air hood, and the volume of exhaust gas sent from the circulating air hood to the spray booth through the first air supply port is controlled by the first fan; a second fan is provided at the second air supply port of the circulating air hood, and the volume of exhaust gas sent from the circulating air hood to the next treatment system through the second air supply port is controlled by the second fan.

[0009] As a further solution of the present invention: the cyclone centrifugal purification tower includes a first centrifugal chamber having a cylindrical inner cavity and a second centrifugal chamber having a cylindrical inner cavity; the cyclone air inlet is located on the first centrifugal chamber; the cyclone air outlet is located on the second centrifugal chamber; a first connecting port is provided on the first centrifugal chamber; a second connecting port is provided on the second centrifugal chamber; the first connecting port is connected to the second connecting port.

[0010] As a further solution of the present invention: the cyclone air inlet is located on the side of the first centrifugal bin; a cyclone reversing tube that cooperates with the cyclone air inlet is fixed in the first centrifugal bin; the exhaust gas enters the first centrifugal bin from the cyclone air inlet and rotates around the outside of the cyclone reversing tube; one end opening of the cyclone reversing tube is a first connecting port, and the other end opening of the cyclone reversing tube is connected to the second connecting port; one end opening of the second centrifugal bin is a second connecting port; the cyclone air outlet is located on the side of the second centrifugal bin, and the cyclone air outlet is tangent to the side of the second centrifugal bin; an adjusting part is fixed in the second centrifugal bin, and the adjusting part has a conical guide surface facing the second connecting port, and the adjusting part also has a cylindrical guide surface; the conical guide surface and the cylindrical guide surface are two continuous surfaces on the adjusting part, and the conical guide surface is located between the cylindrical guide surface and the second connecting port.

[0011] As a further solution of the present invention: the first centrifugal chamber and the second centrifugal chamber are both arranged vertically, and the second centrifugal chamber is located above the first centrifugal chamber; a collecting box is installed at the bottom of the first centrifugal chamber, and the collecting box has a collecting port corresponding to the bottom opening of the first centrifugal chamber, and the collecting box is also provided with a drain outlet and a filter screen; a spray component is installed in the first centrifugal chamber and / or the second centrifugal chamber.

[0012] As a further solution of the present invention: the Venturi filter water tank includes a filter bin, a dehydration bin and a water collection bin, the filter bin is connected to the dehydration bin, and the water collection bin is connected to the filter bin; the water tank air inlet is located on the filter bin; a water film generating device is provided in the filter bin; the water tank air outlet is located on the dehydration bin; a reversing dehydration device is provided in the dehydration bin; the exhaust gas enters the filter bin from the water tank air inlet, and reaches the dehydration bin after passing through the water film produced by the water film generating device; the exhaust gas reaching the dehydration bin is dehydrated by the reversing dehydration device and then sucked out from the water tank air outlet; the water collection bin is used to collect water in the filter bin; a water circulation device is provided on the water collection bin, and the water circulation device is used to supply water in the water collection bin to the water film generating device.

[0013] As a further solution of the present invention: the water film generating device includes a water inlet pipe, a water uniforming trough and a water guide plate, and the water inlet pipe, the water uniforming trough and the water guide plate are all fixed in the filter bin; the water inlet pipe feeds water into the water uniforming trough; the water guide plate is arranged at an angle, and the water guide plate is located below the overflow outlet of the water uniforming trough; the reversing dehydration device includes a baffle fixed in the dehydration bin; the water circulation device includes a water pump fixed on the water collecting bin; the water inlet of the water pump is connected to the water collecting bin, and the water outlet of the water pump is connected to the water inlet pipe; a filtering device is fixed in the water collecting bin, and the water in the water collecting bin reaches the water inlet of the water pump after being filtered by the filtering device.

[0014] As a further solution of the present invention: a third fan is provided at the spray exhaust port of the spray booth, and the exhaust gas is accelerated by the third fan when it reaches the cyclone centrifugal purification tower from the spray booth.

[0015] As a further solution of the present invention: an air cooler is provided, and the cold air outlet of the air cooler is connected to the fresh air inlet of the spray booth.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When the exhaust gas internal circulation filtration system separates and filters the solid matter in the exhaust gas generated by spraying, it mainly uses wind speed and water to complete the separation and filtration, and it is not easy for the channel to be blocked by the solid matter in the exhaust gas; during continuous and long-term operation, the exhaust gas internal circulation filtration system can meet the needs of continuously separating and filtering the solid matter in the exhaust gas, and will not cause the exhaust gas internal circulation filtration system to be in a suspended state due to cleaning of the separated and filtered solid matter, thereby effectively ensuring stable production; the present invention improves the exhaust gas treatment efficiency while ensuring a good purification effect on the exhaust gas by improving the exhaust gas purification method, and reduces the suspension of the exhaust gas internal circulation filtration system, thereby effectively improving production efficiency;

[0018] Second, before the exhaust gas is filtered by the water film in the Venturi filter water tank, it first undergoes centrifugal motion to separate the solid matter in the exhaust gas. Therefore, the solid matter contained in the exhaust gas entering the Venturi filter water tank has been initially separated. When the exhaust gas is filtered by the water film in the Venturi filter water tank, the solid matter that can be filtered by the water film has been reduced, so that the contact time between the exhaust gas and the water film can be effectively shortened, that is, the exhaust gas can be accelerated, which is more conducive to improving the exhaust gas treatment efficiency; the water in the Venturi filter water tank can be reused to make the water film to a certain extent, which is more environmentally friendly;

[0019] 3. Part of the exhaust gas entering the circulating air cabinet is sent to the spray cabinet through the first air supply port to continue spraying. By recycling the exhaust gas generated by spraying, the amount of paint used is effectively reduced, the amount of exhaust gas generated is reduced from the source, and we actively respond to energy conservation and emission reduction and build a beautiful new society. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a structural stereogram of the cyclone centrifugal purification tower of the present invention;

[0022] Figure 3 This is another structural perspective view of the cyclone centrifugal purification tower of the present invention;

[0023] Figure 4 This is a structural front view of the cyclone centrifugal purification tower of the present invention;

[0024] Figure 5 This is a top view of the structure of the cyclone centrifugal purification tower of the present invention;

[0025] Figure 6 yes Figure 5 Schematic diagram of the cross section along the AA direction;

[0026] Figure 7 It is a structural stereogram of the Wenqiuli filtered water cabinet of the present invention;

[0027] Figure 8 This is a structural front view of the Venturi filtered water cabinet of the present invention;

[0028] Figure 9 yes Figure 8 Schematic diagram of the cross section along the BB direction;

[0029] Figure 10 yes Figure 8 Schematic diagram of the cross section along CC direction;

[0030] The reference numerals and names in the figures are as follows:

[0031] Spraying cabinet-1, cyclone centrifugal purification tower-2, Venturi filter water cabinet-3, circulating air cabinet-4, first fan-5, second fan-6, third fan-7, cooling fan-8, next treatment system-9,

[0032] Fresh air inlet-101, spraying return air inlet-102, spraying exhaust outlet-103, cyclone air inlet-201, cyclone air outlet-202, water tank air inlet-301, water tank air outlet-302, wind cabinet air inlet-401, first air supply inlet-402, second air supply inlet-403,

[0033] First centrifugal chamber 2001, second centrifugal chamber 2002, first connecting port 2003, second connecting port 2004, swirl reversing tube 2005, regulating element 2006, conical guide surface 2007, cylindrical guide surface 2008, collecting box 2009, collecting port 2010, spray element 2011, drain port 2012, filter screen 2013, cover plate 2014,

[0034] Filtration chamber-3001, dehydration chamber-3002, water collection chamber-3003, water film generating device-3004, reversing dehydration device-3005, water circulation device-3006, water inlet pipe-3007, water uniforming trough-3008, water guide plate-3009, filtration device-3010, baffle-3011, water pump-3012. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] See also Figure 1-10 An exhaust gas internal circulation filtration system includes a spray booth 1, a cyclone centrifugal purification tower 2, a Venturi filter water cabinet 3, and a circulating air cabinet 4. The spray booth 1 has a fresh air inlet 101, a spray return air inlet 102, and a spray exhaust outlet 103; the cyclone centrifugal purification tower 2 has a cyclone air inlet 201 and a cyclone air outlet 202; the Venturi filter water cabinet 3 has a water cabinet air inlet 301 and a water cabinet air outlet 302; and the circulating air cabinet 4 has an air cabinet air inlet 401, a first air supply inlet 402, and a second air supply inlet 403. The spray exhaust port 103 of the spray cabinet 1 is connected to the cyclone air inlet 201 of the cyclone centrifugal purification tower 2, the cyclone air outlet 202 of the cyclone centrifugal purification tower 2 is connected to the water tank air inlet 301 of the Venturi filter water cabinet 3, the water tank air outlet 302 of the Venturi filter water cabinet 3 is connected to the wind cabinet air inlet 401 of the circulating wind cabinet 4, and the first air supply port 402 of the circulating wind cabinet 4 is connected to the spray return air port 102 of the spray cabinet 1.

[0037] The waste gas generated by spraying in the spray booth 1 is sent to the cyclone centrifugal purification tower 2 through the spraying exhaust port 103. The waste gas undergoes centrifugal motion in the cyclone centrifugal purification tower 2 to centrifugally attach solid matter in the waste gas to the cyclone centrifugal purification tower 2.

[0038] After completing centrifugal motion in the cyclone centrifugal purification tower 2, the exhaust gas reaches the Venturi filter water tank 3 through the cyclone outlet 202. The exhaust gas is filtered by a water membrane in the Venturi filter water tank 3 to filter out solid matter in the exhaust gas.

[0039] The exhaust gas is filtered by a water film in the Venturi filter water cabinet 3 and reaches the circulating air cabinet 4 through the air cabinet air inlet 401. The exhaust gas entering the circulating air cabinet 4: part of it is sent to the spray cabinet 1 through the first air supply port 402 to continue spraying, and the other part is sent to the next treatment system 9 through the second air supply port 403 for treatment.

[0040] The solid matter in the exhaust gas generated by spraying in the spray booth 1 is centrifugally separated and filtered with a water membrane, which greatly reduces the solid matter contained in the exhaust gas reaching the circulating air cabinet 4. The improvement benefits include:

[0041] 1) The waste gas is supplied to the next treatment system 9 through the second gas supply port 403 and finally discharged, with the solid matter reduced, thus significantly reducing the pollution to the environment;

[0042] 2) The reduction of solid matter makes the concentration of other substances in the exhaust gas higher, which is more conducive to reducing the power consumption of the next treatment system 9 (such as combustion, when the exhaust gas reaches a concentration that can be used as fuel).

[0043] The exhaust gas generated by spraying in spray booth 1 passes through cyclonic centrifugal purification tower 2 and Venturi filter tank 3 in sequence. Before the exhaust gas undergoes water film filtration in Venturi filter tank 3, it undergoes centrifugal motion to separate solid matter from the exhaust gas. Therefore, the solid matter contained in the exhaust gas entering Venturi filter tank 3 has already been initially separated. When the exhaust gas undergoes water film filtration in Venturi filter tank 3, the amount of solid matter that can be filtered by the water film is reduced. The resulting improvements include:

[0044] 1) The contact time between the exhaust gas and the water film can be effectively shortened, that is, the exhaust gas can be accelerated, which is more conducive to improving the treatment efficiency of the exhaust gas;

[0045] 2) The water in the Venturi filter water tank can be reused to make water film to a certain extent, which is more environmentally friendly.

[0046] Part of the exhaust gas entering the circulating air cabinet 4 is sent to the spray cabinet 1 through the first air supply port 402 to continue spraying. By recycling the exhaust gas generated by spraying, the amount of paint used is effectively reduced, the amount of exhaust gas generated is reduced from the source, and energy conservation and emission reduction are actively responded to build a beautiful new society.

[0047] When the present invention separates and filters the solid matter in the waste gas generated by spraying, it is mainly accomplished by wind speed and water, and it is not easy for the channel to be blocked by the solid matter in the waste gas. Therefore, during continuous and long-term operation, the waste gas internal circulation filtration system can meet the needs of continuously separating and filtering the solid matter in the waste gas, and the waste gas internal circulation filtration system will not be suspended due to the cleaning of the separated and filtered solid matter, thereby effectively ensuring the stable production. The present invention improves the waste gas purification method, effectively improves the waste gas treatment efficiency while ensuring a good purification effect on the waste gas, and reduces the suspension of the waste gas internal circulation filtration system, thereby effectively improving production efficiency.

[0048] Preferably, 80% of the exhaust gas entering the circulating air cabinet 4 is delivered to the spray booth 1 through the first air supply port 402 for continued spraying, and 20% is delivered to the next treatment system 9 through the second air supply port 403 for treatment. 20% of fresh air (the volume of the exhaust gas discharged from the second air supply port) can continuously enter the spray booth 1 through the fresh air inlet 101 for pressurized spraying, ensuring spraying pressure and spraying quality. 80% of the exhaust gas is recycled, separated, and filtered, resulting in better filtration effect and greater energy saving.

[0049] As a type of air volume control, a first fan 5 is provided at the first air supply port 402 of the circulating fume hood 4. The volume of exhaust gas delivered from the circulating fume hood 4 to the spray booth 1 through the first air supply port 402 is controlled by the first fan 5. A second fan 6 is provided at the second air supply port 403 of the circulating fume hood 4. The volume of exhaust gas delivered from the circulating fume hood 4 to the subsequent treatment system 9 through the second air supply port 403 is controlled by the second fan 6. Those skilled in the art may achieve the aforementioned air volume control function by using gas delivery equipment such as an air compressor or air pump, or by changing the opening ratio of the first and second air supply ports, and all such functions fall within the scope of protection of the present invention.

[0050] Preferably, the spray exhaust port 103 of the spray booth 1 is provided with a third fan 7. When the exhaust gas reaches the cyclone centrifugal purification tower 2 from the spray booth 1, it is accelerated by the third fan 7, which has a better centrifugal separation effect on solid matter in the exhaust gas.

[0051] During cold spraying operations, this exhaust gas internal circulation filtration system is also equipped with an air cooler 8, whose cold air outlet is connected to the fresh air inlet 101 of the spray booth 1. By recycling the exhaust gas, the amount of cold air delivered by the air cooler 8 to the spray booth 1 is also reduced, and the power consumption of the air cooler is also reduced, thus saving energy. The reduced cold air delivery volume of the air cooler 8 allows for a smaller model of the air cooler to be used, which reduces the overall cost investment and is more conducive to promotion.

[0052] Taking the cooling air of the cooling tower as an example, compared with other exhaust gas treatment systems without exhaust gas recycling, the exhaust gas internal circulation system has exhaust gas recycling, and when the exhaust gas circulation volume is 80%, the energy consumption of the air cooler is reduced by more than 60%.

[0053] The above-mentioned next treatment system can be an activated carbon adsorption and desorption + RCO catalytic combustion treatment system, or a zeolite rotor + RTO catalytic combustion treatment system.

[0054] Please refer to the following for details: Figure 2-6 In an embodiment of the present invention, the cyclone centrifugal purification tower includes a first centrifugal chamber 2001 having a cylindrical inner cavity and a second centrifugal chamber 2002 having a cylindrical inner cavity. The cyclone air inlet 201 is located in the first centrifugal chamber 2001, and the cyclone air outlet 201 is located in the second centrifugal chamber 2002. The first centrifugal chamber 2001 is provided with a first connecting port 2003, and the second centrifugal chamber 2002 is provided with a second connecting port 2004, and the first connecting port 2003 and the second connecting port 2004 are connected.

[0055] The exhaust gas enters the first centrifugal chamber 2001 from the cyclone air inlet 201 and undergoes centrifugal motion, so that the solid matter in the exhaust gas is centrifugally attached to the inner wall of the first centrifugal chamber 2001 during the centrifugal motion; the exhaust gas reaches the second connecting port 2004 from the first connecting port 2003 and continues to undergo centrifugal motion in the second centrifugal chamber 2002, so that the solid matter in the exhaust gas is centrifugally attached to the inner wall of the second centrifugal chamber 2002 during the centrifugal motion; finally, the exhaust gas is discharged from the cyclone air outlet 202. After the second centrifugal motion, the solid matter in the exhaust gas is separated more cleanly.

[0056] The flow direction of the exhaust gas in the first centrifugal chamber 2001 and the second centrifugal chamber 2002 is as follows: Figure 6 Indicated by the arrow line.

[0057] Preferably, the cyclone air inlet 201 is located on the side of the first centrifugal chamber 2001. A swirl reversing tube 2005 is fixed in the first centrifugal chamber 2001 to cooperate with the cyclone air inlet 201; the exhaust gas enters the first centrifugal chamber 2001 from the cyclone air inlet 201 and rotates around the outer side of the swirl reversing tube 2005.

[0058] One end opening of the swirl reversing tube 2005 is the first communication port 2003 , and the other end opening of the swirl reversing tube 2005 is connected to the second communication port 2004 .

[0059] Exhaust gas enters the first centrifugal chamber 2001 from the cyclone inlet 201, swirls around the outside of the swirl reversing tube 2005, and finally enters the swirl reversing tube 2005 from the first connecting port 2003. It then passes through the swirl reversing tube 2005 and reaches the second connecting port 2004. As the exhaust gas swirls within the first centrifugal chamber 2001, it is guided by the swirl reversing tube 2005, which reduces the risk of relative airflow and ensures smoother rotation.

[0060] The axial center line of the swirl reversing tube 2005 coincides with the axial center line of the first centrifugal chamber 2001, so that the guiding effect is better.

[0061] The centrifugal motion of the exhaust gas in the first centrifugal chamber 2001 includes:

[0062] 1) Rotation around the outer side of the swirl reversing tube 2005;

[0063] 2) Reversing from the outside of the swirl reversing tube 2005 into the swirl reversing tube 2005.

[0064] To ensure that the exhaust gas can smoothly enter the swirl reversing tube 2005 from the outside of the swirl reversing tube 2005, the exhaust gas entering the first centrifugal chamber 2001 from the cyclone air inlet 201 rotates around the outside of the swirl reversing tube 2005 in a spiral manner and moves toward the end of the swirl reversing tube 2005 having the first communication port 2003. Figure 6 As shown, this embodiment provides a cover plate 2014 on the first centrifugal chamber 2001, so that the exhaust gas can only flow downward and eventually reach the second connecting port 2004 from the first connecting port 2003. There are many technical means to achieve this purpose, such as: arranging the cyclone air inlet obliquely downward, etc., which are not listed here one by one.

[0065] One end of the second centrifugal chamber 2002 is open to form a second communication port 2004. The cyclone outlet 202 is located on the side of the second centrifugal chamber 2002 and is tangential to the side of the second centrifugal chamber 2002. An adjusting member 2006 is fixed within the second centrifugal chamber 2002. The adjusting member 2006 has a conical guide surface 2007 facing the second communication port 2003. The adjusting member 2006 also has a cylindrical guide surface 2008. The conical guide surface 2007 and the cylindrical guide surface 2008 are two continuous surfaces on the adjusting member 2006, and the conical guide surface 2007 is located between the cylindrical guide surface 2008 and the second communication port 2004.

[0066] After the exhaust gas enters the second centrifugal chamber 2002 from the second connecting port 2004 , the exhaust gas hits the conical guide surface 2007 and flows evenly toward the rear of the conical guide surface 2007 , that is, the exhaust gas flows in a conical shape under the action of the conical guide surface. Figure 4 The second communication port 2004 is located below the tapered guide surface 2007. The flow behind the tapered guide surface 2007 is Figure 4 Upward flow in.

[0067] On a plane perpendicular to the axial centerline of the second centrifugal chamber 2001: the exhaust gas in the second centrifugal chamber 2002 near the cyclone outlet 202 is quickly discharged from the second centrifugal chamber 2002 from the cyclone outlet 202. At this time, the exhaust gas still in the second centrifugal chamber 2002 flows toward the cyclone outlet 202 under negative pressure; the cyclone outlet 202 is tangent to the side of the second centrifugal chamber 2002, so that when the exhaust gas in the second centrifugal chamber 2002 flows toward the cyclone outlet 202 under negative pressure, it rotates around the cylindrical guide surface 2008 with the cylindrical guide surface 2008 as the rotation center, and when it turns to the cyclone outlet 202, it is discharged from the second centrifugal chamber 2002 from the cyclone outlet 202.

[0068] The centrifugal motion of the exhaust gas in the second centrifugal chamber 2002 includes:

[0069] 1) Reversing by impact on the conical guide surface 2007;

[0070] 2) Rotation around the cylindrical guide surface 2008.

[0071] The cyclone centrifugal purification tower of this embodiment is used to centrifugally separate solid matter in the exhaust gas, and the separation effect is better.

[0072] The design of the conical guide surface 2007 and the cylindrical guide surface 2008 enables the exhaust gas entering the second centrifugal chamber 2002 from the second connecting port 2004 to be diverted in a conical shape and evenly, and to rotate around the cylindrical guide surface 2008 after diversion; that is, relative airflow is not easily generated in the process from the exhaust gas entering the second centrifugal chamber 2002 to the exhaust gas being discharged from the second centrifugal chamber 2002, thereby greatly improving the centrifugal purification effect of the second centrifugal chamber 2002.

[0073] To facilitate the cleaning of the first centrifugal chamber 2001 and the second centrifugal chamber 2002, and the collection of solid matter after centrifugal separation: the first centrifugal chamber 2001 and the second centrifugal chamber 2002 are both arranged vertically, and the second centrifugal chamber 2002 is located above the first centrifugal chamber 2001; a collecting box 2009 is installed at the bottom of the first centrifugal chamber 2001, and the collecting box 2009 has a collecting port 2010 corresponding to the bottom opening of the first centrifugal chamber 2001, and the collecting box 2009 is also provided with a drain port 2012 and a filter screen 2013; a spray part 2011 is installed in the first centrifugal chamber 2001 and / or the second centrifugal chamber 2002.

[0074] Spray element 2011 is connected to an external high-pressure water source to spray the inner walls of first centrifugal chamber 2001 and second centrifugal chamber 2002 with high pressure. Solid matter adhering to the inner walls of first centrifugal chamber 2001 and second centrifugal chamber 2002 is flushed to collection tank 2009. After being filtered by filter screen 2013 for solid-liquid separation, liquid is collected from drain port 2012, and solid matter is collected from collection tank 2009. Solid and liquid matter in second centrifugal chamber 2002 first pass through swirl guide tube 2005 before reaching collection tank 2009.

[0075] After spraying, the moisture on the inner wall of the first centrifugal bin 2001 and the inner wall of the second centrifugal bin 2002 is more conducive to the attachment of solid matter.

[0076] To save installation space, one collecting box 2009 can correspond to multiple first centrifugal chambers 2001 .

[0077] Please refer to the following for details: Figure 7-10In this embodiment of the present invention, the Venturi filtration water tank includes a filter chamber 3001, a dehydration chamber 3002, and a water collection chamber 3003. The filter chamber 3001 is connected to the dehydration chamber 3002, and the water collection chamber 3003 is connected to the filter chamber 3001. The water tank air inlet 301 is located on the filter chamber 3001, and a water film generating device 3004 is installed in the filter chamber 3001. The water tank air outlet 302 is located on the dehydration chamber 3002, and a reversing dehydration device 3005 is installed in the dehydration chamber 3002. Exhaust gas enters the filter chamber 3001 from the water tank air inlet 301, passes through the water film generated by the water film generating device 3004, and then reaches the dehydration chamber 3002. The exhaust gas reaching the dehydration chamber 3002 is dehydrated by the reversing dehydration device 3005 and then is sucked out of the water tank air outlet 302. The water collection chamber 3003 is used to collect water in the filter chamber 3001. The water collection chamber 3003 is provided with a water circulation device 3006, which is used to supply the water in the water collection chamber 3003 to the water film generating device 3004. The water circulation device 3006 allows the water in the filter chamber 3001 and the water collection chamber 3003 to be recycled, which is more environmentally friendly.

[0078] After the exhaust gas passes through the water film produced by the water film generating device 3004, the solid matter in the exhaust gas is filtered by the water film, so that the exhaust gas sucked out from the water tank outlet 302 is cleaner and contains less solid matter; after the exhaust gas passes through the water film, it is dehydrated in the dehydration bin 3002, and the water content of the exhaust gas can be better controlled, which is more conducive to subsequent recycling, discharge or combustion.

[0079] The flow direction of the exhaust gas in the filter chamber 3001 and the dehydration chamber 3002 is as follows: Figure 10 Indicated by the arrow line.

[0080] If it is necessary to collect the water in the dehydration bin 3002, the water tank outlet 302 can be positioned above the reversing dehydration device 3005. The connection between the dehydration bin 3002 and the filter bin 3001 is located below the reversing dehydration device 3005, and the connection between the filter bin 3001 and the water collection bin 3003 is located below the connection between the dehydration bin 3002 and the filter bin 3001. The water in the dehydration bin 3002 eventually flows into the water collection bin 3003 due to gravity.

[0081] Preferably, the water film generating device 3004 includes a water inlet pipe 3007, a water distribution trough 3008, and a water guide plate 3009. The water inlet pipe 3007, the water distribution trough 3008, and the water guide plate 3009 are all fixed in the filter chamber 3001. The water inlet pipe 3007 feeds water into the water distribution trough 3008. The water guide plate 3009 is arranged at an angle and is located below the overflow port of the water distribution trough 3008. The water in the water distribution trough 3008 evenly falls onto the water guide plate 3009 from the overflow port of the water distribution trough 3008. The water slides down the water guide plate 3009 at an angle and forms a water film. The thickness of the water film is relatively uniform, effectively ensuring the filtration effect.

[0082] The reversing dehydration device 3005 includes a baffle 3011 fixed in the dehydration chamber 3002. The exhaust gas will carry some water after passing through the water film. The baffle 3011 is used to change the flow direction of the exhaust gas so that when the exhaust gas reverses direction, some of the water in the exhaust gas adheres to the baffle 3011, thereby reducing the water content of the exhaust gas.

[0083] The water circulation device 3006 includes a water pump 3012 fixed to the water collection chamber 3003. The water inlet of the water pump 3012 is connected to the water collection chamber 3003, and the water outlet of the water pump 3012 is connected to the water inlet pipe 3007. The water in the water collection chamber 3003 is supplied to the water inlet pipe 3007 by the water pump 3012, so that the water in the filter chamber 3001 and the water collection chamber 3003 can be recycled. The structure is simple and the operation is convenient.

[0084] A filter device 3010 is fixed in the water collection bin 3003. The water in the water collection bin 3003 is filtered by the filter device 3010 and reaches the water inlet of the water pump 3012. The filter device 3010 filters the solid matter in the water, so that the cleanliness of the water supplied to the water inlet pipe 3007 can be effectively guaranteed.

[0085] It should be noted that centrifugal motion, as used throughout this article, refers to the tendency of solid matter in exhaust gas to gradually deviate from its path during rotation and / or reversal, due to the relative mass of the solid matter itself being greater than that of other matter in the exhaust gas. This refers to the movement of solid matter in the exhaust gas as it moves along a specific path, causing it to deviate from that path. For ease of explanation, this type of movement will be referred to as centrifugal motion of exhaust gas throughout this article.

[0086] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An exhaust gas internal circulation filtration system, characterized by: Including spray booth, cyclone centrifugal purification tower, Venturi filter water cabinet and circulating air cabinet; The spray booth has fresh air inlet, spray air return inlet and spray exhaust inlet; The cyclone centrifugal purification tower has a cyclone air inlet and a cyclone air outlet; The Venturi filter water tank has a water tank air inlet and a water tank air outlet; The circulating air cabinet has an air cabinet air inlet, a first air supply port and a second air supply port; The spray exhaust port of the spray booth is connected to the cyclone air inlet of the cyclone centrifugal purification tower, the cyclone air outlet of the cyclone centrifugal purification tower is connected to the water tank air inlet of the Venturi filter water tank, the water tank air outlet of the Venturi filter water tank is connected to the air cabinet air inlet of the circulating air cabinet, and the first air supply port of the circulating air cabinet is connected to the spray return air port of the spray booth; The waste gas generated by spraying in the spray booth is sent to the cyclone centrifugal purification tower through the spraying exhaust port. The waste gas undergoes centrifugal motion in the cyclone centrifugal purification tower to centrifugally attach the solid matter in the waste gas to the cyclone centrifugal purification tower; After the exhaust gas completes the centrifugal motion in the cyclone centrifugal purification tower, it reaches the Venturi filter water tank through the cyclone outlet. The exhaust gas is filtered by a water membrane in the Venturi filter water tank to filter out solid matter in the exhaust gas. The exhaust gas is filtered by water film in the Venturi filter water cabinet and then reaches the circulating air cabinet through the air cabinet air inlet. Part of the exhaust gas entering the circulating air cabinet is sent to the spray cabinet through the first air supply port to continue spraying, and the other part is sent to the next treatment system through the second air supply port for treatment; The cyclone centrifugal purification tower comprises a first centrifugal chamber having a cylindrical inner cavity and a second centrifugal chamber having a cylindrical inner cavity; the cyclone air inlet is located on the first centrifugal chamber; The cyclone outlet is located on the second centrifugal chamber; the first centrifugal chamber is provided with a first communication port; the second centrifugal chamber is provided with a second communication port; the first communication port is connected to the second communication port; The cyclone air inlet is located on the side of the first centrifugal chamber; a swirl reversing pipe that cooperates with the cyclone air inlet is fixed in the first centrifugal chamber; The exhaust gas enters the first centrifugal chamber from the cyclone air inlet and rotates around the outer side of the swirl reversing tube; one end opening of the swirl reversing tube is the first connecting port, and the other end opening of the swirl reversing tube is connected to the second connecting port; one end opening of the second centrifugal chamber is the second connecting port; the cyclone air outlet is located on the side of the second centrifugal chamber, and the cyclone air outlet is tangent to the side of the second centrifugal chamber; an adjusting member is fixed in the second centrifugal chamber, and the adjusting member has a conical guide surface facing the second connecting port, and the adjusting member also has a cylindrical guide surface; the conical guide surface and the cylindrical guide surface are two continuous surfaces on the adjusting member, and the conical guide surface is located between the cylindrical guide surface and the second connecting port; After the exhaust gas enters the second centrifugal chamber from the second connecting port, the exhaust gas hits the conical guide surface and flows evenly to the rear of the conical guide surface. The second connecting port is located below the conical guide surface, and the flow to the rear of the conical guide surface is upward flow.

2. The exhaust gas internal circulation filtration system according to claim 1, characterized in that: The exhaust gas entering the circulating air cabinet: 80% is sent to the spray cabinet through the first air supply port for further spraying, and 20% is sent to the next treatment system through the second air supply port for treatment.

3. The exhaust gas internal circulation filtration system according to claim 2, characterized in that: The first air supply port of the circulating air cabinet is provided with a first fan, and the amount of exhaust gas sent from the circulating air cabinet to the spray booth through the first air supply port is controlled by the first fan; The second air supply port of the circulating air cabinet is provided with a second fan, and the amount of exhaust gas sent from the circulating air cabinet to the next treatment system through the second air supply port is controlled by the second fan.

4. The exhaust gas internal circulation filtration system according to any one of claims 1 to 3, characterized in that: The first centrifugal chamber and the second centrifugal chamber are both arranged vertically, and the second centrifugal chamber is located above the first centrifugal chamber; A collecting box is installed at the bottom of the first centrifugal bin, and the collecting box has a collecting port corresponding to the bottom opening of the first centrifugal bin, and is also provided with a drain port and a filter screen; A spraying component is installed in the first centrifugal bin and / or the second centrifugal bin.

5. The exhaust gas internal circulation filtration system according to any one of claims 1 to 3, characterized in that: The Venturi filtered water tank includes a filtering chamber, a dehydration chamber and a water collection chamber. The filtering chamber is connected to the dehydration chamber, and the water collection chamber is connected to the filtering chamber. The air inlet of the water tank is located on the filter bin; A water film generating device is provided in the filter chamber; The air outlet of the water tank is located on the dehydration bin; The dehydration bin is equipped with a reversing dehydration device; The waste gas enters the filter chamber from the air inlet of the water tank, passes through the water film produced by the water film generating device and reaches the dehydration chamber; the waste gas reaching the dehydration chamber is dehydrated by the reversing dehydration device and then sucked out from the air outlet of the water tank; The water collection tank is used to collect water in the filter tank; A water circulation device is provided on the water collection bin, and the water circulation device is used to supply the water in the water collection bin to the water film generating device.

6. The exhaust gas internal circulation filtration system according to claim 5, characterized in that: The water film generating device includes a water inlet pipe, a water uniformity trough and a water guide plate, which are all fixed in the filter chamber; the water inlet pipe flows into the water uniformity trough; the water guide plate is arranged obliquely and is located below the overflow port of the water uniformity trough; The reversing dehydration device includes a baffle fixed in the dehydration bin; The water circulation device includes a water pump fixed on the water collection tank; the water inlet of the water pump is connected to the water collection tank, and the water outlet of the water pump is connected to the water inlet pipe; A filtering device is fixed in the water collection bin, and the water in the water collection bin is filtered by the filtering device before reaching the water inlet of the water pump.

7. The exhaust gas internal circulation filtration system according to claim 1, 2, 3 or 6, characterized in that: A third fan is provided at the spray exhaust port of the spray booth, and the exhaust gas is accelerated by the third fan when it reaches the cyclone centrifugal purification tower from the spray booth.

8. The exhaust gas internal circulation filtration system according to claim 1, 2, 3 or 6, characterized in that: An air cooler is provided, and the cold air outlet of the air cooler is connected to the fresh air inlet of the spray booth.

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