Complete industrial waste gas treatment system

Abstract

The utility model provides a complete industrial waste gas treatment system which comprises a first-stage absorption tower, a second-stage photo-Fenton oxidation tower, a third-stage absorption tower and an exhaust funnel, the primary absorption tower is used for carrying out primary treatment on the waste gas, transferring particulate matters in the waste gas to a water phase and absorbing part of water-soluble substances in the waste gas; the primary absorption tower is connected with the secondary photo-Fenton oxidation tower through a first gas inlet pipe; the secondary photo-Fenton oxidation tower is in countercurrent contact with the waste gas through a Fenton reagent, absorbs malodorous substances in the oxidized waste gas and accelerates the reaction under the photocatalysis effect; the second-stage photo-Fenton oxidation tower is connected with a third-stage absorption tower through a second gas inlet pipe; the third-stage absorption tower is used for further treating the waste gas oxidized by the photo-Fenton oxidation tower; an induced draft fan is arranged in the exhaust funnel; the third-stage absorption tower is connected with the induced draft fan through a third gas inlet pipe; and the waste gas treated by the third-stage absorption tower can be transported to an exhaust funnel through an induced draft fan for up-to-standard emission.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a complete set of industrial waste gas treatment system. Background Art

[0002] Industrial enterprises will generate a certain amount of waste gas during the production process. The main components of the waste gas are acidic and alkaline inorganic substances, and also contain a small amount of organic matter and particulate matter. The composition is complex and difficult to treat.

[0003] Waste gas treatment equipment mainly refers to an environmental protection equipment that uses different process technologies to recycle or remove and reduce harmful components in exhaust gas emissions to protect the environment and purify the air, so that our environment is not polluted.

[0004] However, in the prior art, most of the waste gas treatment equipment only treats the waste gas through a single treatment process or method, so the treatment efficiency is low, and the complex waste gas components cannot be completely treated, resulting in many devices needing to be repeatedly operated to barely achieve the cleaning of the waste gas;

[0005] In view of the problems existing in the prior art, there is an urgent need for a complete set of industrial waste gas treatment system that can perform multiple targeted treatments on the complex components in the waste gas, which can not only further improve the waste gas treatment efficiency but also save the operating cost of the device. Utility Model Content

[0006] In order to solve the problems existing in the prior art, the utility model provides a complete industrial waste gas treatment system. The complete industrial waste gas treatment system of the present application includes multiple absorption tower equipment and photo-Fenton oxidation tower equipment, which can further carry out targeted and repeated treatment of complex components in the waste gas, improve the waste gas treatment efficiency, and ensure that the waste gas can meet the relevant national standards for a long time and stably after being treated by the equipment. The present application can also further save operating costs and optimize the waste gas treatment process by developing a new easy-to-operate and high-efficiency waste gas treatment device.

[0007] In order to achieve the above purpose, the utility model proposes a complete set of industrial waste gas treatment system, including a primary absorption tower, a secondary light Fenton oxidation tower, a tertiary absorption tower, and an exhaust pipe;

[0008] The primary absorption tower is used to perform preliminary treatment on the waste gas, transfer the particulate matter in the waste gas to the water phase and absorb some of the substances that are easily soluble in water;

[0009] The primary absorption tower is connected to the secondary photo-Fenton oxidation tower through a first air inlet pipe; the secondary photo-Fenton oxidation tower contacts the exhaust gas in countercurrent through a Fenton reagent and absorbs and oxidizes malodorous substances in the exhaust gas and accelerates the reaction under the action of photocatalysis;

[0010] The secondary photo-Fenton oxidation tower is connected to the tertiary absorption tower through a second air inlet pipe; the tertiary absorption tower is used to further process the waste gas oxidized by the photo-Fenton oxidation tower;

[0011] An induced draft fan is arranged in the exhaust chimney; the three-stage absorption tower is connected to the induced draft fan through a third air inlet pipe; the waste gas treated by the three-stage absorption tower can be transported to the exhaust chimney through the induced draft fan for emission that meets the standards.

[0012] Preferably, the primary absorption tower comprises a first air outlet, a first manhole sight glass, a first demisting device, a first spray system, a first swirl plate, a first downcomer, a first air inlet, a first shell, and a first circulating water tank;

[0013] A first air outlet is provided on the top of the first shell, and a first air inlet is opened at a tangential position on the outer side of the first shell; the first swirl plate is provided inside the first shell, the first spray system is located above the first swirl plate, and the first defogger is located above the first spray system; a pair of identical, inclined first downcomers are symmetrically provided below the first swirl plate, one end of each of the first downcomers is connected to the first swirl plate and the inner wall of the first shell, and the other end is inclined downward close to the central axis of the first shell; a first circulating water tank is also provided on one side of the first shell, and the first circulating water tank is connected to the bottom of the first shell; a plurality of first manhole sight glasses for observing the situation inside the tower are provided on the side of the first shell.

[0014] Preferably, the first demisting device is a reverse cyclone plate; and the first spraying system is a spray pipe spraying system.

[0015] Preferably, the secondary light Fenton oxidation tower comprises a second air outlet, a second manhole sight glass, a second demisting device, a filler absorption device, a second air inlet, a second shell, and a second circulating water tank;

[0016] A second air outlet is provided on the top of the second shell, and a second air inlet is opened on the outer side of the second shell; the filler absorption device is arranged inside the second shell, and a second defogger is arranged between the filler absorption device and the second air outlet; a second circulating water tank is also provided on one side of the second shell, and the second circulating water tank is connected to the bottom of the second shell; a plurality of second manhole sight glasses for observing the situation inside the tower are provided on the side of the second shell.

[0017] The Fenton reagent used in the secondary light Fenton oxidation tower is hydrogen peroxide and ferrous sulfate;

[0018] Preferably, the filler absorption device comprises at least two groups of filler absorption modules, and each group of the filler absorption modules comprises a second spray system, a filler layer, and a filler support plate;

[0019] The second spray system is located above the packing layer, and a packing support plate is provided below the packing layer;

[0020] An electrodeless ultraviolet lamp group is provided below the filler support plate and below the second demisting device.

[0021] Preferably, the second demisting device adopts a Φ25 ball ring; the second spray system includes a spray pipe and a plurality of spiral nozzles; and the packing layer adopts a Φ73 Taylor rosette.

[0022] Preferably, the three-stage absorption tower includes a third air outlet, a third manhole sight glass, a third demisting device, a third spray system, a third swirl plate, a third downcomer, a third air inlet, a third shell, and a third circulating water tank;

[0023] A third air outlet is provided on the top of the third shell, and a third air inlet is opened at a tangential position on the outer side of the third shell; the third swirl plate is provided inside the third shell, the third spray system is located above the third swirl plate, and the third defogger is located above the third spray system; a pair of identical, inclined third downcomers are symmetrically provided below the third swirl plate, one end of each of the third downcomers is connected to the third swirl plate and the inner wall of the third shell, and the other end is obliquely downward close to the central axis of the third shell; a third circulating water tank is also provided on one side of the third shell, and the third circulating water tank is connected to the bottom of the third shell; a plurality of third manhole sight glasses for observing the situation inside the tower are provided on the side of the third shell.

[0024] Preferably, the third demisting device is a reverse cyclone plate; and the third spraying system is a spray pipe spraying system.

[0025] Preferably, the primary absorption tower and the tertiary absorption tower are both cyclone plate towers.

[0026] Preferably, the primary absorption tower, the secondary photo-Fenton oxidation tower and the tertiary absorption tower are all connected with a circulating water pump for circulating the absorption liquid.

[0027] The waste gas collected by a complete set of industrial waste gas treatment system of the present application enters a primary absorption tower, which adopts a cyclone plate tower to transfer particulate matter in the waste gas to the water phase and absorb some water-soluble substances such as acids and alkalis; the waste gas then enters a secondary photo-Fenton oxidation tower, which adopts a packed tower, in which the Fenton reagent can countercurrently contact with the waste gas to absorb and oxidize malodorous substances in the waste gas and accelerate the reaction under the action of photocatalysis; after pre-treatment in the primary absorption tower and the secondary photo-Fenton oxidation tower, the waste gas then enters a tertiary absorption tower, which adopts a cyclone plate absorption tower to oxidize the front section into small molecular pollutants for absorption; the waste gas is passed into a demisting device for gas-liquid separation; the treated waste gas is sent to a 15m exhaust chimney through an induced draft fan to meet the emission standards; the absorption liquid in the primary absorption tower comes from the water in the secondary photo-Fenton oxidation tower, which countercurrently contacts the process gas to absorb the hydrophilic organic matter in the waste gas and transfer it from the gas to the water phase. Then the absorption liquid is continuously discharged and put into the wastewater regulating tank; the primary absorption tower and the secondary photo-Fenton oxidation tower of the present application can absorb the hydrophilic organic matter in the waste gas and transfer it from the gas to the water phase through the countercurrent contact of the effluent from the aerobic tank of the sewage station with the process gas; the absorption liquid is continuously discharged into the primary absorption tower; the absorption liquid can be circulated by a circulating pump, and the absorption liquid is regularly discharged from the absorption tower;

[0028] Among them, the first and third absorption towers are cyclone plate towers with cyclone plates inside. After the gas enters the absorption tower tangentially, the liquid is sprayed from the top of the tower from top to bottom through the spray system, and the liquid is dispersed through the receiving plate under the spray system, so that the gas and liquid are fully mixed and reacted;

[0029] The secondary light Fenton oxidation tower is equipped with a packing support plate inside, and the packing is placed on the support plate in a random or integral manner. The liquid is sprayed onto the packing from the tower top spray system and flows down along the surface of the packing. The gas enters from the lower part of the tower, in a countercurrent state relative to the liquid, and continuously passes through the gaps of the packing. On the surface of the packing, the gas and liquid are in close contact for mass transfer. The secondary light Fenton oxidation tower is provided with two sets of demisting devices near the second air outlet, one set of packing demisting device and one set of wire mesh demisting device; the packing tower is provided with an electrodeless ultraviolet lamp group;

[0030] The Fenton reagent uses hydrogen peroxide and ferrous sulfate;

[0031] The first, second and third demisting devices are located at the lower end of the absorption tower outlet and above the spray system.

[0032] The primary absorption tower and the secondary photo-Fenton oxidation tower can utilize the effluent from the aerobic pool of the sewage station as the absorption liquid, thereby improving the absorption efficiency, saving water resources, and saving operation costs.

[0033] Compared with the prior art, the utility model has the following beneficial effects:

[0034] 1. The complete industrial waste gas treatment system of the present application includes multiple absorption tower equipment and photo-Fenton oxidation tower equipment, which can further carry out targeted and repeated treatment of complex components in the waste gas, improve the waste gas treatment efficiency, and ensure that the waste gas can meet the relevant national standards for a long time and stably after being treated by the equipment. The present application can also further save operating costs and optimize the waste gas treatment process by developing new easy-to-operate and high-efficiency waste gas treatment devices.

[0035] 2. The primary absorption tower and the secondary photo-Fenton oxidation tower of the present application can utilize the effluent from the aerobic pool of the sewage station as the absorption liquid, thereby improving the absorption efficiency, saving water resources, and saving operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 This is a schematic diagram of the planar structure of a complete set of industrial waste gas treatment system of the utility model;

[0038] Figure 2 It is a schematic diagram of the planar structure of the primary absorption tower of the utility model;

[0039] Figure 3 It is a schematic diagram of the plan structure of the two-stage light Fenton oxidation tower of the utility model;

[0040] Figure 4 It is a schematic diagram of the plan structure of the three-stage absorption tower of the utility model;

[0041] As shown in the figure: a primary absorption tower 1, a first air outlet 11, a first manhole mirror 12, a first demister 13, a first spray system 14, a first cyclone plate 15, a first downcomer 16, a first air inlet 17, a first shell 18, a first circulating water tank 19, a secondary light Fenton oxidation tower 2, a second air outlet 21, a second manhole mirror 22, a second demister 23, a second spray system 24, a packing layer 25, a packing support plate 26, The second air inlet 27, the second shell 28, the second circulating water tank 29, the electrodeless ultraviolet lamp group 210, the three-stage absorption tower 3, the third air outlet 31, the third manhole sight glass 32, the third defogger 33, the third spray system 34, the third swirl plate 35, the third downcomer 36, the third air inlet 37, the third shell 38, the third circulating water tank 39, the exhaust pipe 4, the first air inlet pipe 5, the second air inlet pipe 6, the induced draft fan 7, the third air inlet pipe 8, and the circulating water pump 9. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0043] Embodiment 1

[0044] like Figure 1-4 As shown, this embodiment proposes a complete industrial waste gas treatment system, characterized in that it includes a primary absorption tower 1, a secondary light Fenton oxidation tower 2, a tertiary absorption tower 3, and an exhaust pipe 4;

[0045] The primary absorption tower 1 is used to perform preliminary treatment on the waste gas, transfer the particulate matter in the waste gas to the water phase and absorb some of the substances that are easily soluble in water;

[0046] The primary absorption tower 1 is connected to the secondary photo-Fenton oxidation tower 2 through the first air inlet pipe 5; the secondary photo-Fenton oxidation tower 2 is in countercurrent contact with the exhaust gas through the Fenton reagent and absorbs and oxidizes the malodorous substances in the exhaust gas and accelerates the reaction under the action of photocatalysis;

[0047] The secondary photo-Fenton oxidation tower 2 is connected to the tertiary absorption tower 3 through the second air inlet pipe 6; the tertiary absorption tower 3 is used to further process the waste gas oxidized by the photo-Fenton oxidation tower;

[0048] An induced draft fan 7 is provided in the exhaust chimney 4; the three-stage absorption tower 3 is connected to the induced draft fan 7 via a third air inlet pipe 8; the waste gas treated by the three-stage absorption tower 3 can be transported to the exhaust chimney 4 via the induced draft fan 7 for emission up to standard.

[0049] like Figure 2 As shown, the primary absorption tower 1 includes a first air outlet 11, a first manhole mirror 12, a first demisting device 13, a first spray system 14, a first swirl plate 15, a first downcomer 16, a first air inlet 17, a first shell 18, and a first circulating water tank 19;

[0050] A first air outlet 11 is provided on the top of the first shell 18, and a first air inlet 17 is opened at a tangential position on the outer side of the first shell 18; the first swirl plate 15 is arranged inside the first shell 18, the first spray system 14 is located above the first swirl plate 15, and the first defogger 13 is located above the first spray system 14; a pair of identical, inclined first downcomers 16 are symmetrically provided below the first swirl plate 15, one end of each of the first downcomers 16 is connected to the first swirl plate 15 and the inner wall of the first shell 18, and the other end is inclined downward close to the central axis of the first shell 18; a first circulating water tank 19 is also provided on one side of the first shell 18, and the first circulating water tank 19 is connected to the bottom of the first shell 18; a plurality of first manhole sight glasses 12 for observing the situation inside the tower are provided on the side of the first shell 18.

[0051] The first demisting device 13 is a reverse cyclone plate; the first spraying system 14 is a spray pipe spraying system.

[0052] like Figure 3 As shown, the secondary light Fenton oxidation tower 2 includes a second air outlet 21, a second manhole sight glass 22, a second demisting device 23, a filler absorption device, a second air inlet 27, a second shell 28, and a second circulating water tank 29;

[0053] A second air outlet 21 is provided on the top of the second shell 28, and a second air inlet 27 is opened on the outer side of the second shell 28; the filler absorption device is arranged inside the second shell 28, and a second defogger 23 is arranged between the filler absorption device and the second air outlet 21; a second circulating water tank 29 is also provided on one side of the second shell 28, and the second circulating water tank 29 is connected to the bottom of the second shell 28; a plurality of second manhole mirrors 22 for observing the situation inside the tower are provided on the side of the second shell 28.

[0054] The filler absorption device comprises at least two groups of filler absorption modules, each group of the filler absorption modules comprises a second spray system 24, a filler layer 25, and a filler support plate 26;

[0055] The second spray system 24 is located above the packing layer 25, and a packing support plate 26 is provided below the packing layer 25;

[0056] An electrodeless ultraviolet lamp group 210 is provided below the filler support plate 26 and below the second demisting device 23 .

[0057] The second demisting device 23 adopts a Φ25 ball ring; the second spraying system 24 includes a spraying pipe and a plurality of spiral nozzles; the packing layer 25 adopts a Φ73 Taylor rosette.

[0058] like Figure 4 As shown, the three-stage absorption tower 3 includes a third air outlet 31, a third manhole mirror 32, a third demisting device 33, a third spray system 34, a third swirl plate 35, a third downcomer 36, a third air inlet 37, a third shell 38, and a third circulating water tank 39;

[0059] A third air outlet 31 is provided on the top of the third shell 38, and a third air inlet 37 is opened at a tangential position on the outer side of the third shell 38; the third swirl plate 35 is arranged inside the third shell 38, the third spray system 34 is located above the third swirl plate 35, and the third defogger 33 is located above the third spray system 34; a pair of identical and inclined third downcomers 36 are symmetrically provided below the third swirl plate 35, one end of each of the third downcomers 36 is connected to the third swirl plate 35 and the inner wall of the third shell 38, and the other end is inclined downward close to the central axis of the third shell 38; a third circulating water tank 39 is also provided on one side of the third shell 38, and the third circulating water tank 39 is connected to the bottom of the third shell 38; a plurality of third manhole sight glasses 32 for observing the situation inside the tower are provided on the side of the third shell 38.

[0060] The third demisting device 33 is a reverse cyclone plate; the third spraying system 34 is a spray pipe spraying system.

[0061] The primary absorption tower 1 and the tertiary absorption tower 3 are both cyclone plate towers.

[0062] The primary absorption tower 1 , the secondary photo-Fenton oxidation tower 2 , and the tertiary absorption tower 3 are all connected with a circulating water pump 9 for circulating the absorption liquid.

[0063] A method of using a complete set of industrial waste gas treatment system in this embodiment is as follows:

[0064] Step 1: The collected waste gas enters the primary absorption tower 1, which uses a cyclone plate tower to transfer the particulate matter in the waste gas to the water phase and absorb some of the alcohols, aldehydes, and acids that are easily soluble in water;

[0065] Step 2: the waste gas enters the secondary photo-Fenton oxidation tower 2. The secondary photo-Fenton oxidation tower 2 adopts a packed tower. The Fenton reagent contacts the gas in countercurrent to absorb and oxidize the malodorous substances in the waste gas and accelerates the reaction under the action of photocatalysis.

[0066] Step 3: After the exhaust gas passes through the photo-Fenton oxidation tower 2, it enters the tertiary absorption tower 3. The tertiary absorption tower 3 adopts a cyclone plate absorption tower to further treat the exhaust gas oxidized by the photo-Fenton oxidation tower 2;

[0067] Step 4: passing the exhaust gas into the third demisting device 33 for gas-liquid separation;

[0068] Step 5: The treated waste gas is sent to the 15m exhaust chimney 4 through the induced draft fan 7 to meet the discharge standards;

[0069] Step 6: The absorption liquid in the primary absorption tower 1 comes from the water in the secondary photo-Fenton oxidation tower 2 and contacts the process gas in countercurrent to absorb the hydrophilic organic matter in the exhaust gas and transfer it from the gas to the water phase; the absorption liquid is continuously discharged and put into the wastewater regulating tank;

[0070] Step 7: The secondary photo-Fenton oxidation tower 2 absorbs the hydrophilic organic matter in the waste gas and transfers it from the gas to the water phase through the countercurrent contact of the effluent from the aerobic pool of the sewage station with the process gas; the absorption liquid is continuously discharged into the primary absorption tower 1

[0071] Step 8: The absorption liquid can be circulated through the circulating water pump 9, and the absorption liquid is discharged from the absorption tower regularly;

[0072] The primary absorption tower 1 described in step 1 is a cyclone plate tower, which has a first cyclone plate 15 inside. The gas enters the absorption tower tangentially, and the liquid is sprayed from the top of the tower from the first spray system 14 to the bottom. The liquid is dispersed through the first cyclone plate 15 and the first downcomer 16 below the first spray system 14, so that the gas and liquid are fully mixed and reacted;

[0073] The secondary light Fenton oxidation tower 2 described in step 2 is equipped with a packing support plate 26 inside, and the packing is placed on the packing support plate 26 in a random or neat manner. The liquid is sprayed onto the packing from the second spray system 24 at the top of the tower and flows down along the surface of the packing. The gas enters from the lower part of the tower, in a countercurrent state relative to the liquid, and continuously passes through the gaps in the packing. On the surface of the packing, the gas and liquid are in close contact for mass transfer. The absorption tower is provided with two sets of demisting devices near the second air outlet 21, one set of packing demisting device and one set of wire mesh demisting device; the packing tower is provided with an electrodeless ultraviolet lamp group 210;

[0074] The Fenton reagent described in step 2 uses hydrogen peroxide and ferrous sulfate;

[0075] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

[0076] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A complete industrial waste gas treatment system, characterized in that: It comprises a primary absorption tower (1), a secondary light Fenton oxidation tower (2), a tertiary absorption tower (3), and an exhaust pipe (4); The primary absorption tower (1) is used to perform preliminary treatment on the waste gas, transfer particulate matter in the waste gas to the water phase and absorb some of the substances therein that are easily soluble in water; The primary absorption tower (1) is connected to the secondary photo-Fenton oxidation tower (2) via a first air inlet pipe (5); the secondary photo-Fenton oxidation tower (2) is in countercurrent contact with the exhaust gas via a Fenton reagent and absorbs and oxidizes malodorous substances in the exhaust gas and accelerates the reaction under the action of photocatalysis; The secondary photo-Fenton oxidation tower (2) is connected to the tertiary absorption tower (3) via a second air inlet pipe (6); the tertiary absorption tower (3) is used to further process the waste gas oxidized by the photo-Fenton oxidation tower; An induced draft fan (7) is provided in the exhaust pipe (4); the three-stage absorption tower (3) is connected to the induced draft fan (7) via a third air inlet pipe (8); the waste gas treated by the three-stage absorption tower (3) can be transported to the exhaust pipe (4) via the induced draft fan (7) for emission in compliance with the standards; The primary absorption tower (1) comprises a first air outlet (11), a first manhole sight glass (12), a first demisting device (13), a first spray system (14), a first swirl plate (15), a first downcomer (16), a first air inlet (17), a first shell (18), and a first circulating water tank (19); A first air outlet (11) is provided at the top of the first shell (18), and a first air inlet (17) is provided at a tangential position on the outer side surface of the first shell (18); the first swirl plate (15) is provided inside the first shell (18), the first spray system (14) is located above the first swirl plate (15), and the first demisting device (13) is located above the first spray system (14); a pair of identical and inclined first downcomers (16) are symmetrically provided below the first swirl plate (15), one end of each of the first downcomers (16) is connected to the first swirl plate (15) and the inner wall of the first shell (18), and the other end is inclined downward close to the central axis of the first shell (18); a first circulating water tank (19) is also provided on one side of the first shell (18), and the first circulating water tank (19) is connected to the bottom of the first shell (18); and a plurality of first manhole sight glasses (12) for observing the situation inside the tower are provided on the side of the first shell (18).

2. A complete industrial waste gas treatment system according to claim 1, characterized in that: The first demisting device (13) is a reverse cyclone plate; the first spraying system (14) is a spray pipe spraying system.

3. A complete industrial waste gas treatment system according to claim 1, characterized in that: The secondary light Fenton oxidation tower (2) comprises a second air outlet (21), a second manhole sight glass (22), a second demisting device (23), a filler absorption device, a second air inlet (27), a second shell (28), and a second circulating water tank (29); A second air outlet (21) is provided at the top of the second shell (28), and a second air inlet (27) is provided on the outer side of the second shell (28); the filler absorption device is arranged inside the second shell (28), and a second defogger (23) is arranged between the filler absorption device and the second air outlet (21); a second circulating water tank (29) is also provided on one side of the second shell (28), and the second circulating water tank (29) is connected to the bottom of the second shell (28); and a plurality of second manhole sight glasses (22) for observing the situation inside the tower are provided on the side of the second shell (28).

4. A complete industrial waste gas treatment system according to claim 3, characterized in that: The filler absorption device comprises at least two groups of filler absorption modules, and each group of the filler absorption modules comprises a second spray system (24), a filler layer (25), and a filler support plate (26); The second spray system (24) is located above the packing layer (25), and a packing support plate (26) is provided below the packing layer (25); An electrodeless ultraviolet lamp group (210) is provided below the filler support plate (26) and below the second demisting device (23).

5. A complete industrial waste gas treatment system according to claim 4, characterized in that: The second demisting device (23) adopts a Φ25 ball ring; the second spraying system (24) includes a spraying pipe and a plurality of spiral nozzles; and the packing layer (25) adopts a Φ73 Taylor rosette.

6. A complete industrial waste gas treatment system according to claim 1, characterized in that: The three-stage absorption tower (3) comprises a third air outlet (31), a third manhole sight glass (32), a third demisting device (33), a third spray system (34), a third swirl plate (35), a third downcomer (36), a third air inlet (37), a third shell (38), and a third circulating water tank (39); The third shell (38) is provided with a third air outlet (31) at the top, and a third air inlet (37) is provided at a tangential position on the outer side of the third shell (38); the third swirl plate (35) is arranged inside the third shell (38), the third spray system (34) is located above the third swirl plate (35), and the third demisting device (33) is located above the third spray system (34); a pair of identical and inclined third downcomers (36) are symmetrically arranged below the third swirl plate (35), one end of each of the third downcomers (36) is connected to the third swirl plate (35) and the inner wall of the third shell (38), and the other end is inclined downward close to the central axis of the third shell (38); a third circulating water tank (39) is also provided on one side of the third shell (38), and the third circulating water tank (39) is connected to the bottom of the third shell (38); and a plurality of third manhole sight glasses (32) for observing the situation inside the tower are provided on the side of the third shell (38).

7. A complete industrial waste gas treatment system according to claim 6, characterized in that: The third demisting device (33) is a reverse cyclone plate; the third spraying system (34) is a spray pipe spraying system.

8. A complete industrial waste gas treatment system according to claim 1, characterized in that: The first-stage absorption tower (1) and the third-stage absorption tower (3) are both cyclone plate towers.

9. A complete industrial waste gas treatment system according to claim 1, characterized in that: The primary absorption tower (1), the secondary photo-Fenton oxidation tower (2) and the tertiary absorption tower (3) are all connected to a circulating water pump (9) for circulating the absorption liquid.

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