A waste gas treatment tower and a waste gas treatment method for zinc powder production

Abstract

The application discloses a waste gas treatment tower for zinc powder production and a waste gas treatment method, which comprises a tower body, a mixed water tank and a lye tank, wherein the upper and lower partition plates are horizontally fixed in the tower body from top to bottom, a spraying cavity is arranged below the lower partition plate in the tower body, a transition cavity is arranged between the upper and lower partition plates in the tower body, and a fine filtering cavity is arranged above the upper partition plate in the tower body. Different ways are used to treat waste gas generated in different processes, acid mist type waste gas in the pickling process is treated by adopting the way of alkali washing neutralization, and flue gas type waste gas generated in the hot dipping process is treated by adopting the way of removing large particle solid impurities by adopting the way of cyclone dust removal, the treatment is more targeted, the alkali washing is only for the acid mist type waste gas, and the control on the pH value is facilitated. After the large particle impurities in the flue gas are removed, fine filtering is carried out on the filter cartridge, and the phenomenon that the filtering structure is blocked by the large particle impurities during filtering can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas treatment equipment in zinc powder production process, in particular to a waste gas treatment tower for zinc powder production and a waste gas treatment method. BACKGROUND

[0002] Zinc powder is a dark gray powder of metallic zinc, which can be used as a pigment, has very strong hiding power, and has good rust prevention and atmospheric corrosion resistance. It is commonly used to make rust-proof paint, strong reducing agent, etc. Zinc powder produces waste gas during production, which contains a large amount of zinc particles, acid mist, etc. and needs to be treated before it can meet the emission standard. At present, a large amount of waste gas is generated and discharged during the production of zinc powder, mainly in the pickling process and the hot dipping process. The waste gas generated in the pickling process is acid mist type containing water vapor, and the waste gas generated in the hot dipping process contains zinc-containing flue gas with a large amount of large particle impurities.

[0003] To this end, a zinc oxide production flue gas treatment tower is disclosed in Chinese Utility Model Patent No. CN216986945U, which comprises a treatment tower shell, a water storage tank fixedly connected to the upper surface of the treatment tower shell, a dustproof cover plate attached to the upper surface of the water storage tank, an air inlet hole penetratingly provided at the lower end of the circumferential side of the treatment tower shell, an air inlet pipe fixedly connected to the lower end of the circumferential side of the treatment tower shell, an air outlet hole symmetrically penetratingly provided at the upper end edge of the circumferential side of the treatment tower shell, and a misting nozzle fixedly connected to the lower surface of the water storage tank. The inner wall of the treatment tower shell is fixedly connected with filter plates at equal intervals in the vertical direction, the lower surface of the treatment tower shell is fixedly connected with a support base, and the inner wall of the support base is fixedly connected with a motor.

[0004] The flue gas treatment tower uniformly treats the waste gas without classifying the flue gas. The acid mist and zinc-containing flue gas enter the tower together, are treated by water washing, and are discharged after filtration. Since the proportion of acid mist and flue gas is difficult to control, it is difficult to control the pH value during water washing treatment. In addition, the large particles in the flue gas are not pretreated, which can easily cause the filter plate to be blocked. This blocking phenomenon also often occurs when a bag-type dust collector is used to treat zinc-containing flue gas.

[0005] Therefore, a waste gas treatment tower for zinc powder production and a waste gas treatment method are proposed to solve the above problems. SUMMARY

[0006] The present application aims to provide a waste gas treatment tower for zinc powder production to solve the problems raised in the background.

[0007] In order to achieve the above object, the present application provides the following technical scheme: a waste gas treatment tower for zinc powder production and a waste gas treatment method, comprising a tower body, a mixed water tank and a lye tank, the tower body is internally horizontally fixed with an upper partition plate and a lower partition plate from top to bottom, a spraying cavity is arranged below the lower partition plate in the tower body, a transition cavity is arranged between the upper partition plate and the lower partition plate in the tower body, and a fine filtering cavity is arranged above the upper partition plate in the tower body;

[0008] An acid mist inlet is fixed to the side wall of the tower body at the same height position of the spraying cavity, the acid mist inlet is communicated with the spraying cavity, a cyclone dust removal assembly is fixed in the transition cavity, the cyclone dust removal assembly comprises an air induction fan fixed to the outer side wall of the tower body, and the air induction fan is communicated with and fixed with a smoke dust inlet;

[0009] A spraying plate is fixed horizontally to the top surface of the spraying cavity, a plurality of spraying heads are uniformly fixed to and communicated with the bottom surface of the spraying plate, a fine filtering cylinder and a coarse filtering cylinder are rotatably connected horizontally in the fine filtering cavity, the bottom surfaces of the fine filtering cylinder and the coarse filtering cylinder are both open structures, the diameter of the coarse filtering cylinder is smaller than that of the fine filtering cylinder, and the coarse filtering cylinder is gap-fitted on the inner side of the bottom surface of the fine filtering cylinder.

[0010] Preferably, a mixing cavity is arranged on the bottom surface in the mixed water tank, one end of a liquid inlet pipe is fixed to the bottom surface of the mixed water tank, the other end of the liquid inlet pipe penetrates through the side wall of the tower body and is fixed to the spraying plate, one end of the liquid inlet pipe is communicated with the mixing cavity, the other end is communicated with the spraying plate, and a liquid inlet pump is fixed to and communicated with the liquid inlet pipe.

[0011] Preferably, the lye tank is communicated with one end of a lye pipe, the other end of the lye pipe is fixed to the side wall of the mixed water tank, the lye pipe is communicated with the inside of the mixed water tank, an acid-base detector is fixedly embedded in the side wall of the mixed water tank, an alkali-resistant pump is fixed to and communicated with the lye pipe, a stirring shaft is rotatably connected in the mixing cavity, a plurality of stirring paddles are uniformly fixed to the circumferential side of the stirring shaft, a first speed reducer is fixed to the lower part of the side wall of the mixed water tank, and the end of the rotating shaft of the first speed reducer is fixed to the end of the stirring shaft.

[0012] Preferably, the cyclone dust removal assembly further comprises a straight cylinder part fixed in the transition cavity, a tapered part is fixed to and communicated with the bottom surface of the straight cylinder part, a dust collecting part is fixed to and communicated with the bottom end of the tapered part, a spiral air inlet pipe is fixed to the side wall of the straight cylinder part, the end of the spiral air inlet pipe penetrates through the side wall of the tower body and is communicated with the air induction fan, the spiral air inlet pipe is communicated with the inside of the straight cylinder part, an air outlet is fixed to and communicated with the top surface of the straight cylinder part, and the top end of the air outlet penetrates through the upper partition plate and is located at the inner center position of the bottom part of the coarse filtering cylinder.

[0013] Preferably, a plurality of air pipes are fixedly and vertically arranged on the circumferential side of the cyclone dust removal assembly in the transition cavity, the top ends of the plurality of air pipes penetrate through the upper partition plate and are communicated with a plurality of L-shaped pipes, the top ends of the L-shaped pipes are located in the bottom part of the coarse filtering cylinder, and the bottom ends of the air pipes are communicated with the spraying cavity.

[0014] Preferably, a filler frame is horizontally fixed below the spray plate in the spray chamber, the filler frame is filled with filler, a fixed ring is fixedly sleeved on the peripheral side of the tower body, a plurality of supporting legs are uniformly fixed on the bottom surface of the fixed ring, a second speed reducer is fixed on the top surface of the tower body, a shaft rod is fixed on the end of the rotating shaft of the second speed reducer, a fine filter cartridge and a coarse filter cartridge are fixed on the center position of the shaft rod, an exhaust pipe is fixed on the side wall of the top surface of the tower body and communicates with the fine filter chamber, and an exhaust fan is fixed on the exhaust pipe and communicates with the exhaust pipe.

[0015] Preferably, the bottom end of the tower body is fixedly connected with one end of a liquid return pipe, the other end of the liquid return pipe is fixedly connected with the top surface of a mixed water tank, a liquid return pump is fixedly connected with and communicates with the liquid return pipe, one end of the liquid return pipe communicates with the spray chamber, and the other end of the liquid return pipe communicates with the inside of the mixed water tank, and a filter plate is horizontally fixed in the inside of the mixed water tank and located above the mixing chamber.

[0016] The application also provides a waste gas treatment tower and a waste gas treatment method for zinc powder production.

[0017] Step one: alkali solution adjustment: water is added into the mixed water tank, an alkali-resistant pump is started to deliver the alkali solution into the mixed water tank, and when the pH value detected by the acid-alkali detector is 10-12, the alkali-resistant pump is stopped;

[0018] Step two: pipeline connection: the waste gas pipe in the zinc powder pickling process is connected to the acid mist inlet, and the waste gas pipe in the zinc powder hot dipping process is connected to the smoke dust inlet;

[0019] Step three: acid mist pretreatment: the acid mist generated in the pickling process enters the spray chamber, at this time, the alkali solution enters the spray plate under the action of the liquid inlet pump and is sprayed out of the spray head to perform alkali washing treatment on the acid mist, absorption and neutralization are performed, the acid mist pretreatment is completed, and the pretreated acid mist enters the fine filter chamber through the gas pipe;

[0020] Step four: smoke gas pretreatment: the zinc-containing smoke gas generated in the hot dipping process enters the cyclone dust removal assembly under the action of the induced draft fan, and large particles with a particle size greater than 10 μm are removed, the large particles enter the dust collection part, and the pretreated smoke gas enters the fine filter chamber through the gas outlet;

[0021] Step five: final filtration: the pretreated smoke gas and the pretreated acid mist enter the fine filter chamber, small particle impurities are removed under the filtration of the coarse filter cartridge and the fine filter cartridge, and clean gas is obtained, the clean gas is discharged from the exhaust pipe under the negative pressure action of the exhaust fan, and the waste gas treatment is completed;

[0022] Step six waste liquid circulation: in the whole treatment process, the waste liquid after the alkali washing in the spray cavity is under the action of the liquid return pump into the liquid return pipe, and then enters the mixing water tank from the upper part of the mixing water tank, and falls into the mixing cavity after filtering through the filter plate and mixing with the original liquid. During the whole mixing process, the acid-base detector detects the pH value of the mixed liquid all the time, when the pH value is lower than 7, the alkali-resistant pump is started to add alkali to the mixing cavity, when the pH value is higher than 9, the alkali-resistant pump is closed, so that the pH value is kept between 7 and 9.

[0023] Compared with the prior art, the beneficial effects of the present application are:

[0024] The present application uses different ways to treat waste gas generated in different processes. The acid mist type waste gas in the pickling process is treated by alkali washing and neutralization, and the flue gas type waste gas generated in the hot dipping process is treated by removing large particle solid impurities by cyclone dust removal. The treatment is more targeted, and the alkali washing is only for the acid mist type waste gas, which is convenient for controlling the pH value. After removing the large particle impurities in the flue gas, fine filtration is carried out, which can avoid the phenomenon that the filter structure is blocked by large particle impurities during filtration. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the main body structure schematic diagram in the first embodiment of the present application;

[0026] Figure 2 It is the tower body cut structure schematic diagram in the first and second embodiments of the present application;

[0027] Figure 3 It is the main body structure schematic diagram in the first embodiment of the present application; Figure 2 It is the structure schematic diagram of the structure at A in the first embodiment of the present application;

[0028] Figure 4 It is the main body structure schematic diagram in the first embodiment of the present application; Figure 2 It is the structure schematic diagram of the structure at B in the first embodiment of the present application;

[0029] Figure 5 It is the structure schematic diagram of the cyclone dust removal assembly in the second embodiment of the present application;

[0030] Figure 6 It is the cut structure schematic diagram of the mixing water tank and alkali tank in the second embodiment of the present application.

[0031] In the figure: 1, tower body; 2, mixed water tank; 3, lye tank; 4, spraying cavity; 5, transition cavity; 6, fine filtering cavity; 7, cyclone dust removal assembly; 11, lower partition; 12, upper partition; 13, fixed ring; 14, support leg; 15, acid mist inlet; 21, mixing cavity; 22, stirring shaft; 23, stirring paddle; 24, first speed reducer motor; 25, liquid inlet pipe; 26, liquid inlet pump; 27, liquid return pipe; 28, liquid return pump; 29, filter plate; 210, acid-base detector; 31, lye pipe; 32, alkali-resistant pump; 41, filler frame; 42, filler; 43, spraying plate; 44, spraying head; 51, air pipe; 52, L-shaped pipe; 61, fine filter cartridge; 62, coarse filter cartridge; 63, shaft; 64, second speed reducer motor; 65, exhaust pipe; 66, exhaust fan; 71, straight cylinder part; 72, conical part; 73, dust collecting part; 74, gas outlet; 75, spiral air inlet pipe; 76, air induction fan; 77, smoke dust inlet. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. EMBODIMENT

[0033] Please refer to Figures 1-4 The present application provides a technical solution: a waste gas treatment tower for zinc powder production, comprising a tower body 1, a mixed water tank 2 and a lye tank 3, the tower body 1 is horizontally fixed with an upper partition 12 and a lower partition 11 from top to bottom, a spraying cavity 4 is formed below the lower partition 11 in the tower body 1, the spraying cavity 4 is used for treating acid mist type waste gas generated in the pickling process, a transition cavity 5 is formed between the upper partition 12 and the lower partition 11 in the tower body 1, and a fine filtering cavity 6 is formed above the upper partition 12 in the tower body 1, the fine filtering cavity 6 is used for removing smaller impurity particles in the waste gas;

[0034] An acid mist inlet 15 is fixed at the same height position of the spraying cavity 4 on the side wall of the tower body 1, the acid mist inlet 15 communicates with the spraying cavity 4, a cyclone dust removal assembly 7 is fixed in the transition cavity 5, the cyclone dust removal assembly 7 comprises an air induction fan 76 fixed on the outer side wall of the tower body 1, the air induction fan 76 communicates with and is fixed with a smoke dust inlet 77, the cyclone dust removal assembly 7 is specially used for treating zinc-containing flue gas generated in the hot dipping process, there are a large number of large particle impurities in the zinc-containing flue gas, the large particle impurities are conveniently removed by the cyclone dust removal assembly 7, which also avoids the situation that the filtering structure is easily blocked during fine filtering later;

[0035] The top surface of the spraying cavity 4 is fixedly connected with a spraying plate 43, the bottom surface of the spraying plate 43 is uniformly fixedly connected with a plurality of spraying heads 44, the fine filtering cavity 6 is rotationally connected with a fine filtering cylinder 61 and a coarse filtering cylinder 62, the bottom surface of the fine filtering cylinder 61 and the coarse filtering cylinder 62 is an open structure, the diameter of the coarse filtering cylinder 62 is smaller than that of the fine filtering cylinder 61, and the coarse filtering cylinder 62 is gap-fitted on the inner side of the bottom surface of the fine filtering cylinder 61, so that the double-filtering cylinder structure can better remove small impurity particles. Embodiment

[0036] Please refer to Figures 2-6 For the second embodiment of the present application, which is based on the previous embodiment, a mixing cavity 21 is formed in the inner bottom surface of the mixing water tank 2, one end of a liquid inlet pipe 25 is fixedly connected to the bottom surface of the mixing water tank 2, the other end of the liquid inlet pipe 25 penetrates through the side wall of the tower body 1 and is fixedly connected with the spraying plate 43, one end of the liquid inlet pipe 25 is connected with the mixing cavity 21, and the other end is connected with the spraying plate 43, an inlet pump 26 is fixedly connected to the liquid inlet pipe 25 and is connected with the liquid inlet pipe 25, and the prepared alkali solution is introduced into the spraying cavity 4 through the inlet pump 26 to perform an alkali washing process on the acid mist type waste gas.

[0037] The alkali solution tank 3 is connected with one end of an alkali solution pipe 31, the other end of the alkali solution pipe 31 is fixedly connected with the side wall of the mixing water tank 2, the alkali solution pipe 31 is connected with the inside of the mixing water tank 2, an acid-base detector 210 is fixedly embedded in the side wall of the mixing water tank 2, the acid-base detector 210 is used for real-time detection of pH value, so that the pH value of the alkali washing solution in the mixing water tank 2 is kept at an appropriate value, an alkali-resistant pump 32 is fixedly connected to the alkali solution pipe 31, a stirring shaft 22 is rotationally connected to the inside of the mixing cavity 21, a plurality of stirring blades 23 are uniformly fixedly connected to the side of the stirring shaft 22, a first speed reducer motor 24 is fixedly connected to the lower part of the side wall of the mixing water tank 2, one end of the stirring shaft 22 is fixedly connected to the end of the rotating shaft of the first speed reducer motor 24, and the liquid in the mixing water tank 2 is mixed by stirring, so that the mixing is more uniform.

[0038] The cyclone dust removal assembly 7 further comprises a straight cylinder portion 71 fixedly connected to the inside of the transition cavity 5, the bottom surface of the straight cylinder portion 71 is fixedly connected with and communicates with a conical portion 72, the bottom end of the conical portion 72 is fixedly connected with and communicates with a dust collecting portion 73, the side wall of the straight cylinder portion 71 is fixedly connected with a spiral air inlet pipe 75, the end of the spiral air inlet pipe 75 penetrates through the side wall of the tower body 1 and communicates with an air inlet fan 76, the spiral air inlet pipe 75 communicates with the inside of the straight cylinder portion 71, the top surface of the straight cylinder portion 71 is fixedly connected with and communicates with an air outlet 74, the top end of the air outlet 74 penetrates through the upper partition plate 12 and is located at the inner center position of the bottom of the coarse filtering cylinder 62, the cyclone dust removal assembly 7 is used for removing impurity particles with a particle size greater than 5 μm, mainly to avoid large particles entering the fine filtering cavity 6 and to avoid the phenomenon that the filter cylinders in the fine filtering cavity 6 are blocked by large impurity particles.

[0039] A plurality of air pipes 51 are uniformly and vertically fixedly connected to the side of the cyclone dust removal assembly 7 in the transition cavity 5, the top ends of the plurality of air pipes 51 penetrate through the upper partition plate 12 and communicate with a plurality of L-shaped pipes 52, the top ends of the L-shaped pipes 52 are located at the bottom of the coarse filtering cylinder 62, and the bottom ends of the air pipes 51 communicate with the spraying cavity 4.

[0040] The packing frame 41 is horizontally fixed below the spray plate 43 in the spray cavity 4, the packing frame 41 is filled with the packing 42, the fixed ring 13 is fixedly sleeved on the peripheral side of the tower body 1, the plurality of supporting legs 14 are uniformly fixed on the bottom surface of the fixed ring 13, the second speed reducer 64 is fixed on the top surface of the tower body 1, the shaft rod 63 is fixed on the end of the rotating shaft of the second speed reducer 64, the shaft rod 63 is fixed on the center position of the fine filter cylinder 61 and the coarse filter cylinder 62, the exhaust pipe 65 is fixed on the side wall of the top surface of the tower body 1, the exhaust pipe 65 is communicated with the fine filter cavity 6, the exhaust fan 66 is fixed on the exhaust pipe 65 and is communicated with the exhaust pipe 65, and the exhaust fan 66 generates negative pressure, so that the treated waste gas is discharged through the exhaust pipe 65.

[0041] The liquid return pipe 27 is fixed at one end of the bottom end of the tower body 1, the other end of the liquid return pipe 27 is fixed on the top surface of the mixed water tank 2, the liquid return pump 28 is fixed on and communicated with the liquid return pipe 27, one end of the liquid return pipe 27 is communicated with the spray cavity 4, the other end of the liquid return pipe 27 is communicated with the inside of the mixed water tank 2, and the filter plate 29 is horizontally fixed on the inside of the mixed water tank 2 and located above the mixing cavity 21. Embodiment

[0042] Please refer to Figures 1-6 For the third embodiment of the present application, the embodiment is based on the above two embodiments, and the embodiment provides a waste gas treatment tower for zinc powder production and a waste gas treatment method, including the following steps:

[0043] Step one: alkali solution adjustment: water is added to the mixed water tank 2, the alkali pump 32 is started to deliver the alkali solution into the mixed water tank 2, when the pH value detected by the acid-base detector 210 is 9, the alkali pump 32 is stopped;

[0044] Step two: pipeline connection: the waste gas pipe in the zinc powder pickling process is connected to the acid mist inlet 15, and the waste gas pipe in the zinc powder hot dipping process is connected to the smoke dust inlet 77;

[0045] Step three: acid mist pretreatment: the acid mist generated in the pickling process enters the spray cavity 4, at this time, the alkali solution enters the spray plate 43 under the action of the liquid inlet pump 26 and is sprayed out by the spray head 44 to perform alkali washing treatment on the acid mist, absorption and neutralization are performed, the acid mist pretreatment is completed, and the pretreated acid mist enters the fine filter cavity 6 through the gas pipe 51;

[0046] Step four: smoke gas pretreatment: the zinc-containing smoke gas generated in the hot dipping process enters the cyclone dust removal assembly 7 under the action of the induced draft fan 76, and large particles with a particle size greater than 5 μm can be removed, the large particles enter the dust collection part 73, and the pretreated smoke gas enters the fine filter cavity 6 through the gas outlet 74;

[0047] Step five: final filtration: after the pretreated smoke gas and the pretreated acid mist enter the fine filter cavity 6, small particle impurities are removed under the filtration of the coarse filter cylinder 62 and the fine filter cylinder 61, and clean gas is obtained, which is discharged from the exhaust pipe 65 under the negative pressure of the exhaust fan 66, and the treatment of the waste gas is completed.

[0048] Step six waste liquid circulation: during the whole process, the waste liquid after the alkali washing in the spray chamber 4 enters the liquid return pipe 27 under the action of the liquid return pump 28, then enters the mixing tank 2 from the upper part of the mixing tank 2, and falls into the mixing chamber 21 after being filtered by the filter plate 29, and the whole mixing process, the acid-base detector 210 detects the pH value of the mixed liquid all the time, when the pH value is lower than 7, the alkali-resistant pump 32 is started to add alkali to the mixing chamber 21, when the pH value is higher than 9, the alkali-resistant pump 32 is closed, so that the pH value is kept between 7-9. Embodiment

[0049] Please refer to Figures 1-6 For the fourth embodiment of the present application, which is based on the above three embodiments, the first step of the present application is to adjust the alkali in the mixing tank 2: add water to the mixing tank 2, and start the alkali-resistant pump 32 to deliver alkali to the mixing tank 2, when the acid-base detector 210 detects that the pH value is 9, stop the alkali-resistant pump 32; Step two pipeline connection: connect the waste gas pipe in the zinc powder pickling process to the acid mist inlet 15, and connect the waste gas pipe in the zinc powder hot dipping process to the smoke inlet 77; Step three acid mist pretreatment: the acid mist generated in the pickling process enters the spray chamber 4, at this time the alkali in the liquid inlet pump 26 enters the spray plate 43 and is sprayed out by the spray head 44, the acid mist is treated by alkali washing, absorption and neutralization, the pretreatment is completed, the pretreated acid mist enters the fine filter chamber 6 through the gas pipe 51; Step four smoke pretreatment: the zinc-containing smoke generated in the hot dipping process enters the cyclone dust removal assembly 7 under the action of the induced draft fan 76, which can remove large particles with a particle size greater than 5 μm, the large particles enter the dust collection part 73, and the pretreated smoke enters the fine filter chamber 6 through the gas outlet 74; Step five final filtration: after the pretreated smoke and the pretreated acid mist enter the fine filter chamber 6, small particle impurities are removed by the coarse filter cylinder 62 and the fine filter cylinder 61, becoming clean gas, which is discharged from the exhaust pipe 65 under the negative pressure of the exhaust fan 66, completing the treatment of waste gas. The present application uses different ways to treat waste gas generated in different processes, the acid mist type waste gas in the pickling process is treated by alkali washing and neutralization, and the smoke type waste gas generated in the hot dipping process is treated by cyclone dust removal to remove large particle solid impurities, the treatment is more targeted, the alkali washing is only for the acid mist type waste gas, and the pH value is easy to control. And after removing the large particle impurities in the smoke, the filter cylinder is fine filtered, which can avoid the phenomenon that the filter structure is blocked by large particle impurities during filtration.

[0050] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste gas treatment tower for zinc powder production, comprising a tower body (1), a mixed water tank (2) and a lye tank (3), wherein the mixed water tank (2) and the lye tank (3) are arranged outside the tower body (1), characterized in that: the lye tank (3) is communicated with one end of a lye pipe (31), the other end of the lye pipe (31) is fixedly connected with the side wall of the mixed water tank (2), the tower body (1) is fixedly connected with an upper baffle (12) and a lower baffle (11) from top to bottom, a spraying cavity (4) is arranged below the lower baffle (11) in the tower body (1), a transition cavity (5) is arranged between the upper baffle (12) and the lower baffle (11) in the tower body (1), and a fine filtering cavity (6) is arranged above the upper baffle (12) in the tower body (1); an acid mist inlet (15) is fixedly connected with the side wall of the tower body (1) at the same height position of the spraying cavity (4), the acid mist inlet (15) is communicated with the spraying cavity (4), a cyclone dust removal assembly (7) is fixedly connected in the transition cavity (5), and the cyclone dust removal assembly (7) comprises an induced draft fan (76) fixedly connected with the outer side wall of the tower body (1), wherein the induced draft fan (76) is communicated with and fixedly connected with a smoke dust inlet (77); a spraying plate (43) is fixedly connected with the top surface of the spraying cavity (4), one end of a liquid inlet pipe (25) is fixedly connected with the bottom surface of the mixed water tank (2), the other end of the liquid inlet pipe (25) penetrates through the side wall of the tower body (1) and is fixedly connected with the spraying plate (43), a plurality of spraying heads (44) are uniformly fixedly connected with and communicated with the bottom surface of the spraying plate (43), a fine filtering cylinder (61) and a coarse filtering cylinder (62) are rotatably connected with the fine filtering cavity (6) and the coarse filtering cavity (6) in a horizontal manner, the bottom surfaces of the fine filtering cylinder (61) and the coarse filtering cylinder (62) are both open structures, the diameter of the coarse filtering cylinder (62) is smaller than that of the fine filtering cylinder (61), the coarse filtering cylinder (62) is gap-fitted on the inner side of the bottom surface of the fine filtering cylinder (61), and the fine filtering cavity (6) is used for performing final filtering on gas from the spraying cavity (4) and the cyclone dust removal assembly (7). a mixing cavity (21) is arranged on the bottom surface in the mixed water tank (2), one end of the liquid inlet pipe (25) is communicated with the mixing cavity (21) and the other end thereof is communicated with the spraying plate (43), and an inlet pump (26) is fixedly connected with and communicated with the liquid inlet pipe (25). the lye pipe (31) is communicated with the inside of the mixed water tank (2), an acid-alkali detector (210) is fixedly embedded with the side wall of the mixed water tank (2), an alkali-resistant pump (32) is fixedly connected with and communicated with the lye pipe (31), a stirring shaft (22) is rotatably connected with the mixing cavity (21) in a horizontal manner, a plurality of stirring paddles (23) are uniformly fixedly connected with the circumferential side of the stirring shaft (22), a first speed reducer motor (24) is fixedly connected with the lower part of the side wall of the mixed water tank (2), and the end of the rotating shaft of the first speed reducer motor (24) is fixedly connected with the end of the stirring shaft (22).

2. The waste gas treatment tower for zinc powder production according to claim 1, characterized in that: ​ 3. A waste gas treatment tower for zinc powder production according to claim 2, characterized in that: ​ 4. The off-gas treatment tower for zinc dust production according to claim 3, characterized in that: The cyclone dust removal assembly (7) further comprises a straight cylinder (71) fixed inside the transition chamber (5), the bottom surface of the straight cylinder (71) is fixedly connected and communicated with a conical part (72), the bottom end of the conical part (72) is fixedly connected and communicated with a dust collecting part (73), the side wall of the straight cylinder (71) is fixedly connected with a spiral air inlet pipe (75), the end of the spiral air inlet pipe (75) penetrates through the side wall of the tower body (1) and is communicated with an air blower (76), the spiral air inlet pipe (75) is communicated with the inside of the straight cylinder (71), the top surface of the straight cylinder (71) is fixedly connected and communicated with an air outlet (74), and the top end of the air outlet (74) penetrates through the upper baffle (12) and is located at the inside center position of the bottom of the rough filter cylinder (62).

5. A waste gas treatment tower for zinc dust production according to claim 4, characterized in that: A plurality of air pipes (51) are fixedly connected at the circumferential side of the cyclone dust removal assembly (7) in the transition chamber (5), the top end of the air pipe (51) penetrates through the upper baffle (12) and is communicated with a plurality of L-shaped pipes (52), the top end of the L-shaped pipe (52) is located at the bottom of the rough filter cylinder (62), and the bottom end of the air pipe (51) is communicated with the spray chamber (4).

6. A waste gas treatment tower for zinc dust production according to claim 5, characterized in that: A filler frame (41) is fixedly connected horizontally below the spray plate (43) in the spray chamber (4), the filler frame (41) is filled with a filler (42), the tower body (1) is fixedly sleeved with a fixing ring (13), the bottom surface of the fixing ring (13) is fixedly connected with a plurality of supporting legs (14), the top surface of the tower body (1) is fixedly connected with a second speed reducer (64), the rotating shaft end of the second speed reducer (64) is fixedly connected with a shaft rod (63), the shaft rod (63) is fixedly connected with a fine filter cylinder (61) and a rough filter cylinder (62) at the center position, the top surface of the tower body (1) is fixedly connected with an exhaust pipe (65), the exhaust pipe (65) is communicated with a fine filter chamber (6), and the exhaust pipe (65) is fixedly connected and communicated with an air blower (66).

7. A waste gas treatment tower for zinc dust production according to claim 6, characterized in that: The bottom end of the tower body (1) is fixedly connected with one end of a liquid return pipe (27), the other end of the liquid return pipe (27) is fixedly connected with the top surface of the mixed water tank (2), the liquid return pipe (27) is fixedly connected and communicated with a liquid return pump (28), one end of the liquid return pipe (27) is communicated with the spray chamber (4), the other end is communicated with the inside of the mixed water tank (2), and the inside of the mixed water tank (2) is fixedly connected with a filter plate (29) horizontally at the position above the mixing chamber (21).

8. The off-gas treatment method for the off-gas treatment tower for zinc dust production according to claim 7, characterized by The method comprises the following steps: Step one: alkali solution adjustment: water is added into the mixed water tank (2), the alkali solution is transported into the mixed water tank (2) by starting the alkali-resistant pump (32), and when the pH value detected by the acid-base detector (210) is 9, the alkali-resistant pump (32) is stopped; Step two: pipeline connection: the waste gas pipe in the zinc powder pickling process is connected to the acid mist inlet (15), and the waste gas pipe in the zinc powder hot dipping process is connected to the smoke dust inlet (77); Step three: acid mist pretreatment: the acid mist generated in the pickling process enters the spray chamber (4), at this time, the alkali solution enters the spray plate (43) under the action of the liquid inlet pump (26) and is sprayed out by the spray head (44) to perform alkali washing treatment on the acid mist, absorption and neutralization are performed, the acid mist pretreatment is completed, and the pretreated acid mist enters the fine filter chamber (6) through the air pipe (51); Step four flue gas pretreatment: the zinc-containing flue gas generated in the hot dipping process enters the cyclone dust removal assembly (7) under the action of the induced draft fan (76), and the large particles with a particle size greater than 5 μm are removed, the large particles enter the dust collection part (73), and the pretreated flue gas enters the fine filter cavity (6) through the gas outlet (74); Step five final filtration: after the pretreated flue gas and the pretreated acid mist enter the fine filter cavity (6), small particle impurities are removed under the filtration of the coarse filter cylinder (62) and the fine filter cylinder (61), and clean gas is obtained, which is discharged from the exhaust pipe (65) under the negative pressure action of the exhaust fan (66), and the treatment of the waste gas is completed; Step six waste liquid circulation: during the entire treatment process, the waste liquid after the alkali washing in the spraying cavity (4) enters the liquid return pipe (27) under the action of the liquid return pump (28), then enters the mixing water tank (2) from the upper part of the mixing water tank (2), and falls into the mixing cavity (21) after being filtered by the filter plate (29) to be mixed with the original liquid. During the entire mixing process, the acid-base detector (210) detects the pH value of the mixed liquid all the time, when the pH value is lower than 7, the alkali-resistant pump (32) is started to add alkali to the mixing cavity (21), and when the pH value is higher than 9, the alkali-resistant pump (32) is closed, so that the pH value is maintained between 7 and 9.

Images