Basic zinc carbonate production waste gas purification equipment and purification method

Abstract

The invention belongs to the technical field of waste gas treatment, and particularly relates to basic zinc carbonate production waste gas purification equipment and a purification method. The outer wall of the purification tower is fixedly connected with a gas inlet pipe; a first water pump is fixedly connected to the surface of a supporting plate above the outer wall of the purification tower; the basic zinc carbonate production waste gas purification equipment effectively treats production waste gas and improves air quality through a multi-stage reaction and recovery system, and has the technical advantages that resource recovery is achieved, specifically, a dilute sulphuric acid solution circulation recovery system is utilized, waste of dilute sulphuric acid is greatly reduced, and the production cost is reduced; efficient reaction: the first spraying frame and the second spraying frame alternately react in two stages, so that the reaction effect is remarkably improved; in conclusion, by means of efficient recovery, multi-stage reaction and intelligent maintenance, the equipment achieves precise purification of production waste gas, pollution emission reduction and resource utilization rate improvement, and has remarkable environmental protection and economic benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a waste gas purification device and a purification method for basic zinc carbonate production. Background Art

[0002] Basic zinc carbonate is an important inorganic compound, commonly used in industries such as rubber, ceramics and coatings. Its main raw materials are zinc salts and carbonates. During the production of basic zinc carbonate, a mixed waste gas such as ammonia, carbon dioxide and water vapor will be generated. Through appropriate waste gas treatment measures, the impact on the environment can be effectively reduced.

[0003] A patent application with publication number CN118179194A discloses a waste gas treatment spray washing spray tower, comprising: a tower body, wherein sealing frames are fixedly connected on all four sides of the tower body, and the bottom of the tower body is connected to a sewer pipe, and the bottom of the sewer pipe is connected to a treatment box; when treating waste gas, the spray tower of this application mainly cooperates with an air distribution component and a filter component to perform cyclonic air distribution and reciprocating dynamic filtration treatment in the tower body, and performs uniform and comprehensive spray sedimentation and aeration reaction treatment on the stratified waste gas in the tower body, thereby improving the treatment effect of impurity particles.

[0004] When purifying waste gas generated by basic zinc carbonate production, the aforementioned spray tower can spray solution to effectively treat impurity particles in the waste gas. However, in the process of spraying dilute sulfuric acid solution to react with ammonia in the waste gas, in order to ensure that ammonia emissions meet standards, the amount of dilute sulfuric acid solution sprayed is large and the cost is high. In addition, some unreacted dilute sulfuric acid solution will remain in the aqueous ammonium sulfate solution produced by the reaction, resulting in waste of the dilute sulfuric acid solution.

[0005] To this end, the present invention provides a basic zinc carbonate production waste gas purification device and purification method. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is: the basic zinc carbonate production waste gas purification equipment described in the present invention includes a purification tower; the outer wall of the purification tower is fixedly connected to an air inlet pipe; the surface of the support plate above the outer wall of the purification tower is fixedly connected to a water pump; the input end and output end of the No. 1 water pump are respectively fixedly connected to a liquid inlet pipe and a liquid outlet pipe, the No. 1 liquid inlet pipe is located outside the purification tower, and the No. 1 liquid outlet pipe is located inside the purification tower; the end of the No. 1 liquid outlet pipe away from the No. 1 water pump is fixedly connected to a guide ring; the bottom end of the guide ring is rotatably connected to a No. 1 spray rack; a No. 2 spray rack is arranged inside the purification tower and below the No. 1 spray rack; a recovery mechanism is arranged inside the purification tower, and the recovery mechanism is used to recover part of the unreacted dilute sulfuric acid solution after spraying by the No. 1 spray rack and return it to the No. 2 spray rack for secondary spraying.

[0008] Preferably, the recovery mechanism includes a fixed plate, a collecting cylinder, a guide block and a guide assembly; the fixed plate is fixedly connected to the middle inner wall of the purification tower; the collecting cylinder is fixedly connected to the inner wall of the fixed plate, the bottom inner wall of the collecting cylinder is sloped, and an air flow groove is formed between the fixed plate and the collecting cylinder; the guide block is fixedly connected to the end of the fixed plate; the guide assembly is arranged on the purification tower, and the guide assembly is used to send the liquid collected in the collecting cylinder to the No. 2 spray rack for spraying.

[0009] Preferably, the diversion assembly includes a No. 2 water pump, a No. 2 liquid inlet pipe and a No. 2 liquid outlet pipe; the No. 2 water pump is fixedly connected to the support plate below the outer wall of the purification tower; the No. 2 liquid inlet pipe is fixedly connected to the input end of the No. 2 water pump, and the end of the No. 2 liquid inlet pipe away from the No. 2 water pump is fixedly connected to the middle bottom end of the collecting cylinder; the No. 2 liquid outlet pipe is fixedly connected to the output end of the No. 2 water pump, and the end of the No. 2 liquid outlet pipe away from the No. 2 water pump is fixedly connected to the end of the No. 2 spray rack.

[0010] Preferably, the bottom outer wall of the purification tower is fixedly connected to a support frame; the bottom outer wall of the purification tower is fixedly connected to a No. 1 servo motor, and the No. 1 servo motor is located between the purification tower and the support frame; the output end of the No. 1 servo motor is fixedly connected to a rotating disk, and a plurality of circular grooves are provided on the rotating disk; storage barrels are respectively placed in the plurality of circular grooves of the rotating disk; a funnel opening is provided inside the purification tower and above the rotating disk, and the funnel opening corresponds to the circular grooves.

[0011] Preferably, a guide pipe is fixedly connected to one end of the air inlet pipe close to the purification tower; a No. 3 spray rack is fixedly connected to the top of one end of the guide pipe away from the air inlet pipe, and the No. 3 spray rack is arranged opposite to the No. 2 spray rack.

[0012] Preferably, a filter screen is fixedly connected to the inner wall of the collecting cylinder; and a storage groove is provided on the filter screen.

[0013] Preferably, a No. 2 servo motor is fixedly connected to the top of the purification tower; a rotating rod is fixedly connected to the output end of the No. 2 servo motor, and a No. 1 spray rack is fixedly connected to the rotating rod; a scraper is fixedly connected to the outer wall of the rotating rod, and the scraper is attached to the upper surface of the filter plate; an exhaust fan blade is fixedly connected to the outer wall of the rotating rod and located above the guide ring.

[0014] Preferably, the central outer walls of the No. 2 spray rack and the No. 3 spray rack are both equipped with large-diameter nozzles through pressure relief valves; and a discharge pipe is fixed to the top of the purification tower.

[0015] A method for purifying waste gas from the production of basic zinc carbonate, which uses the above-mentioned waste gas purification equipment for basic zinc carbonate production, and the method comprises the following steps: S1: First, the waste gas generated by the production of basic zinc carbonate is introduced into the interior of the purification tower through the air inlet pipe. The No. 1 water pump extracts dilute sulfuric acid solution through the No. 1 liquid inlet pipe and sends it to the bottom of the No. 1 spray rack connected to the guide ring through the No. 1 liquid outlet pipe for spraying. The ammonia in the waste gas reacts with the dilute sulfuric acid solution to form ammonium sulfate, which falls. The ammonium sulfate and some unreacted dilute sulfuric acid solution are collected in the collection cylinder; S2: The No. 2 water pump then extracts the liquid from the collection cylinder through the No. 2 liquid inlet pipe and sends it to the bottom of the No. 2 spray rack for spraying. The exhaust gas is evenly distributed through the guide pipe and the No. 3 spray rack and discharged into the interior of the purification tower. Some unreacted dilute sulfuric acid solution reacts with the incoming exhaust gas first; S3: The ammonium sulfate produced by the final multiple reactions falls into the storage barrel through the funnel mouth. The No. 1 servo motor controls the rotation of the rotating disk according to the inflow of the dilute sulfuric acid solution at the No. 1 liquid inlet pipe, and transfers and replaces the storage barrel containing a large amount of ammonium sulfate. Finally, the waste gas after the purification reaction is discharged from the exhaust pipe.

[0016] Preferably, after the No. 1 spray rack in S1 sprays the dilute sulfuric acid solution to react with the exhaust gas, the filter plate filters the liquid, and the output end of the No. 2 servo motor drives the scraper and the exhaust fan blades on the rotating rod to rotate simultaneously. The scraper scrapes and collects the impurities on the filter plate in the storage tank, and the exhaust fan blades rotate to pump the exhaust gas and accelerate it to be discharged from the exhaust pipe.

[0017] The beneficial effects of the present invention are as follows: 1. The present invention discloses a basic zinc carbonate production waste gas purification device and method. The basic zinc carbonate production waste gas purification device effectively treats production waste gas and improves air quality through a multi-stage reaction and recovery system. The technical advantages thereof include: Resource recovery: Utilize the recycling system of dilute sulfuric acid solution to significantly reduce the waste of dilute sulfuric acid and lower production costs; High-efficiency reaction: The reaction is carried out alternately by spray racks 1 and 2, and is divided into two stages. In the first stage, dilute sulfuric acid is first used to contact the waste gas to generate a mixed ammonium sulfate aqueous solution. In the second stage, the ammonium sulfate aqueous solution is first used to react with the waste gas, and then the dilute sulfuric acid is used to contact the waste gas for a second reaction, which significantly improves the reaction effect. Filtration and impurity cleaning: The filter screen filters impurities and collects them in the storage tank. The second servo motor drives the scraper to remove impurities, preventing pollution and reducing the residue of particulate impurities. In summary, the equipment achieves precise purification of production waste gas through efficient recovery, multi-stage reaction and intelligent maintenance, reduces pollution emissions, improves resource utilization, and has significant environmental and economic benefits.

[0018] 2. The basic zinc carbonate production waste gas purification equipment and purification method described in the present invention also have the following technical advantages: Improved filtration efficiency: Regularly replace filter plates and storage barrels to extend the life of the equipment and reduce filtration system maintenance; Large flow treatment: equipped with large-caliber nozzles, using guide pipes and spray racks to increase the exhaust gas spray area, effectively treating large volumes of exhaust gas; Intelligent maintenance: Through the intermittent operation of servo motors 1 and 2, the dilute sulfuric acid solution can be effectively recovered and replaced, ensuring the continuous operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a perspective view of the present invention; Figure 2 It is a partial structural cross-sectional view of the purification tower in the present invention; Figure 3 It is a partial structural cross-sectional view of the collecting cylinder in the present invention; Figure 4 It is a structural schematic diagram of the No. 1 spray rack in the present invention; Figure 5 It is a structural diagram of the storage tank in the present invention; Figure 6 The present invention is a flow chart of a method for purifying waste gas from the production of basic zinc carbonate.

[0021] In the figure: 1. Purification tower; 11. Air inlet pipe; 12. Water pump No. 1; 13. Liquid inlet pipe No. 1; 14. Liquid outlet pipe No. 1; 15. Guide ring; 16. Spray rack No. 1; 17. Spray rack No. 2; 2. Fixing plate; 21. Collecting cylinder; 22. Guide block; 3. Water pump No. 2; 31. Liquid inlet pipe No. 2; 32. Liquid outlet pipe No. 2; 4. Support frame; 41. Servo motor No. 1; 42. Rotating disk; 43. Storage bucket; 44. Funnel mouth; 5. Guide pipe; 51. Spray rack No. 3; 6. Filter screen; 61. Storage tank; 7. Servo motor No. 2; 71. Rotating rod; 72. Scraper; 73. Exhaust fan blade; 8. Large-diameter nozzle; 81. Discharge pipe. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] like Figures 1 to 5As shown, a basic zinc carbonate production waste gas purification device according to an embodiment of the present invention includes a purification tower 1; an air inlet pipe 11 is fixedly connected to the outer wall of the purification tower 1; a No. 1 water pump 12 is fixedly connected to the surface of the support plate above the outer wall of the purification tower 1; the input end and output end of the No. 1 water pump 12 are respectively fixedly connected to a No. 1 liquid inlet pipe 13 and a No. 1 liquid outlet pipe 14, the No. 1 liquid inlet pipe 13 is located outside the purification tower 1, and the No. 1 liquid outlet pipe 14 is located inside the purification tower 1; the No. 1 liquid outlet pipe 14 is away from the No. 1 liquid pump 12. One end of the water pump 12 is fixedly connected to a guide ring 15; the bottom end of the guide ring 15 is rotatably connected to a No. 1 spray rack 16; a No. 2 spray rack 17 is provided inside the purification tower 1 and below the No. 1 spray rack 16; a recovery mechanism is provided inside the purification tower 1 for recovering some unreacted dilute sulfuric acid solution after spraying the No. 1 spray rack 16 to the No. 2 spray rack 17 for secondary spraying; when purifying the waste gas generated by the production of basic zinc carbonate, the air inlet pipe 11 is first connected to the waste gas vent. The exhaust gas is injected into the purification tower 1 through the pipeline connection. During the first stage of exhaust gas purification, the exhaust gas rises to the No. 1 spray rack 16 through the recovery mechanism. The No. 1 water pump 12 is started to cooperate with the No. 1 liquid inlet pipe 13 to extract the dilute sulfuric acid solution through the No. 1 liquid outlet pipe 14 to the guide ring 15. The guide ring 15 guides the dilute sulfuric acid solution to the bottom of the No. 1 spray rack 16 for spraying. The dilute sulfuric acid solution first reacts with the ammonia in the exhaust gas, and the ammonium sulfate aqueous solution formed by the reaction is mixed with part of the unreacted dilute sulfuric acid solution and falls to the recovery mechanism. The recovery mechanism sends the mixed aqueous solution to the No. 2 spray rack 17 to start the second stage of exhaust gas purification. The No. 2 spray rack 17 uses the recovered mixed aqueous solution to conduct a preliminary reaction on the introduced exhaust gas to reduce the waste of dilute sulfuric acid solution. Subsequently, the exhaust gas from the preliminary reaction rises to the No. 1 spray rack 16 for a secondary spray reaction. Finally, the purified exhaust gas is discharged from the top of the purification tower 1, which has the effect of recycling the unreacted dilute sulfuric acid solution and reducing the spraying amount and cost of the dilute sulfuric acid solution.

[0024] like Figures 1 to 3 、 Figure 5As shown, the recovery mechanism includes a fixed plate 2, a collecting cylinder 21, a guide block 22 and a guide assembly; the fixed plate 2 is fixedly connected to the middle inner wall of the purification tower 1; the collecting cylinder 21 is fixedly connected to the inner wall of the fixed plate 2, the bottom inner wall of the collecting cylinder 21 is set as a slope, and an air flow groove is formed between the fixed plate 2 and the collecting cylinder 21; the guide block 22 is fixedly connected to the end of the fixed plate 2; the guide assembly is set on the purification tower 1, and the guide assembly is used to send the liquid collected in the collecting cylinder 21 to the second spray rack 17 for spraying Spraying; when the dilute sulfuric acid solution sprayed on the No. 1 spray rack 16 is recovered, the guide block 22 is used to guide the mixed aqueous solution to flow down to the inside of the collecting cylinder 21, and the mixed aqueous solution is drained into the guide assembly through the sloped inner wall at the bottom of the collecting cylinder 21. The guide assembly sends the mixed aqueous solution to the No. 2 spray rack 17 for spraying. The waste gas after the reaction at the No. 2 spray rack 17 rises to the No. 1 spray rack 16 through the air flow groove between the fixed plate 2 and the collecting cylinder 21 to react again, thereby serving as a container for the mixed aqueous solution.

[0025] The diversion assembly includes a No. 2 water pump 3, a No. 2 liquid inlet pipe 31 and a No. 2 liquid outlet pipe 32; the No. 2 water pump 3 is fixedly connected to the support plate below the outer wall of the purification tower 1; the No. 2 liquid inlet pipe 31 is fixedly connected to the input end of the No. 2 water pump 3, and the end of the No. 2 liquid inlet pipe 31 away from the No. 2 water pump 3 is fixedly connected to the middle bottom end of the collecting cylinder 21; the No. 2 liquid outlet pipe 32 is fixedly connected to the output end of the No. 2 water pump 3, and the end of the No. 2 liquid outlet pipe 32 away from the No. 2 water pump 3 is fixedly connected to the end of the No. 2 spray rack 17; when the mixed aqueous solution in the collecting cylinder 21 is recycled, the input end of the No. 2 water pump 3 cooperates with the No. 2 liquid inlet pipe 31 to extract the mixed aqueous solution inside from the bottom end of the collecting cylinder 21, and then the No. 2 liquid outlet pipe 32 sends the mixed aqueous solution to the No. 2 spray rack 17 for spraying. The sprayed mixed aqueous solution undergoes a first preliminary reaction with the waste gas just introduced, which has the effect of recycling the mixed aqueous solution and reducing the waste of resources.

[0026] like Figures 1 to 3As shown, the bottom outer wall of the purification tower 1 is fixedly connected to a support frame 4; the bottom outer wall of the purification tower 1 is fixedly connected to a servo motor 41, and the servo motor 41 is located between the purification tower 1 and the support frame 4; the output end of the servo motor 41 is fixedly connected to a rotating disk 42, and a plurality of circular grooves are provided on the rotating disk 42; storage barrels 43 are respectively placed in the plurality of circular grooves of the rotating disk 42; a funnel opening 44 is provided inside the purification tower 1 and above the rotating disk 42, and the funnel opening 44 corresponds to the circular groove; when the dilute sulfuric acid solution is sprayed to react with the ammonia in the exhaust gas, The ammonium sulfate aqueous solution formed by the reaction falls through the funnel mouth 44 and is temporarily stored in the storage barrel 43. The No. 1 servo motor 41 rotates intermittently according to the liquid inflow of the dilute sulfuric acid solution at the No. 1 liquid inlet pipe 13. The output end of the No. 1 servo motor 41 drives the rotating disk 42 supported on the support frame 4 to rotate, and the storage barrel 43 filled with the ammonium sulfate aqueous solution is transferred out of the purification tower 1, and at the same time, another empty storage barrel 43 is sent into the interior of the purification tower 1. Then, the storage barrel 43 filled with the ammonium sulfate aqueous solution is recovered and stored and replaced with an empty storage barrel 43, thereby recovering the ammonium sulfate aqueous solution.

[0027] like Figure 1 and Figure 2 As shown, the air inlet pipe 11 is fixedly connected to the guide pipe 5 at one end close to the purification tower 1; the guide pipe 5 is fixedly connected to the top of the end away from the air inlet pipe 11 with the No. 3 spray rack 51, and the No. 3 spray rack 51 is arranged opposite to the No. 2 spray rack 17; when the exhaust gas enters the interior of the purification tower 1 from the air inlet pipe 11, the No. 3 spray rack 51 is used to cooperate with the guide pipe 5 to connect with the air inlet pipe 11, and the exhaust gas entering the air inlet pipe 11 flows through the guide pipe 5 to the No. 3 spray rack 51 and is evenly dispersed and discharged, and is discharged from multiple exhaust holes on the top of the No. 3 spray rack 51, and the No. 2 spray rack 17 evenly sprays the mixed aqueous solution for reaction, thereby improving the purification reaction effect of the exhaust gas.

[0028] like Figure 1 、 Figure 2 and Figure 5 As shown, a filter screen plate 6 is fixedly connected to the inner wall of the collecting cylinder 21; a storage tank 61 is opened on the filter screen plate 6; when the No. 1 spray rack 16 sprays the dilute sulfuric acid solution to react with the ammonia in the exhaust gas, if the raw materials are impure, the reaction conditions are inappropriate or the equipment material is not corrosion-resistant, some particulate impurities are likely to be generated, such as ammonium sulfate crystals, metal ions and insoluble particles, etc. The filter screen plate 6 is used to filter the solution after the reaction to reduce the particulate impurities in the mixed solution, and the impurities are temporarily stored in the storage tank 61 waiting for cleaning.

[0029] like Figures 1 to 3As shown, the top of the purification tower 1 is fixedly connected to a No. 2 servo motor 7; the output end of the No. 2 servo motor 7 is fixedly connected to a rotating rod 71, and the No. 1 spray rack 16 is fixedly connected to the rotating rod 71; the outer wall of the rotating rod 71 is fixedly connected to a scraper 72, and the scraper 72 is attached to the upper surface of the filter screen 6; the outer wall of the rotating rod 71 and the position above the guide ring 15 are fixedly connected to the exhaust fan blade 73; when particulate impurities adhere to the filter screen 6, the output end of the No. 2 servo motor 7 is used to drive The rotating rod 71 rotates slowly, and the scraper 72 scrapes the impurities on the filter screen 6 as the rotating rod 71 rotates, and the impurities are scraped off and temporarily stored in the storage tank 61, thereby cleaning the impurities on the surface of the filter screen 6. At the same time, the No. 1 spray rack 16 rotates at the bottom of the guide ring 15 as the rotating rod 71 rotates, and the No. 1 spray rack 16 evenly sprays the dilute sulfuric acid solution for reaction, thereby improving the effect of exhaust gas purification, and the exhaust fan blades 73 also rotate synchronously with the rotating rod 71, and the exhaust fan blades 73 draw air to accelerate the discharge of exhaust gas.

[0030] like Figures 1 to 3 、 Figure 5 As shown, the central outer walls of the No. 2 spray rack 17 and the No. 3 spray rack 51 are both equipped with large-diameter nozzles 8 through pressure relief valves; a discharge pipe 81 is fixedly connected to the top of the purification tower 1; when a small amount of exhaust gas is purified, the exhaust gas is discharged through the exhaust holes on the periphery of the No. 3 spray rack 51, and reacts with the mixed water solution sprayed on the periphery of the No. 2 spray rack 17. When a large amount of exhaust gas is purified, the power of the No. 2 water pump 3 is increased to open the pressure relief valve inside the No. 2 spray rack 17, and a large amount of exhaust gas is sent into the interior of the purification tower 1. The pressure relief valve inside the No. 3 spray rack 51 is also opened. Relying on the large-diameter nozzles 8 installed on the No. 2 spray rack 17 and the No. 3 spray rack 51, the synchronous spraying and exhaust reaction of the periphery is coordinated, the spraying mode is changed according to the amount of exhaust gas, and the reaction effect on the exhaust gas is improved. The discharge pipe 81 guides the purified exhaust gas for discharge, and can also introduce the exhaust gas into the purifier to purify other gases.

[0031] like Figure 6 As shown, a method for purifying waste gas from the production of basic zinc carbonate is provided. The method uses the waste gas purification equipment for the production of basic zinc carbonate described above for purification. The method comprises the following steps: S1: First, the waste gas generated by the production of basic zinc carbonate is introduced into the interior of the purification tower 1 through the air inlet pipe 11. The No. 1 water pump 12 extracts dilute sulfuric acid solution through the No. 1 liquid inlet pipe 13 and sends it through the No. 1 liquid outlet pipe 14 to the bottom of the No. 1 spray rack 16 connected to the guide ring 15 for spraying. The ammonia in the waste gas reacts with the dilute sulfuric acid solution to form ammonium sulfate, which falls. The ammonium sulfate and some unreacted dilute sulfuric acid solution are collected in the collection cylinder 21. S2: Then, the No. 2 water pump 3 extracts the liquid in the collecting cylinder 21 through the No. 2 liquid inlet pipe 31, and sends it to the bottom of the No. 2 spray rack 17 through the No. 2 liquid outlet pipe 32 for spraying. The exhaust gas is evenly distributed through the guide pipe 5 and the No. 3 spray rack 51 and discharged into the interior of the purification tower 1. Some unreacted dilute sulfuric acid solution reacts with the incoming exhaust gas first. S3: Finally, the ammonium sulfate produced by multiple reactions falls into the interior of the storage barrel 43 along the funnel mouth 44. The No. 1 servo motor 41 controls the rotation of the rotating disk 42 according to the liquid inflow of the dilute sulfuric acid solution at the No. 1 liquid inlet pipe 13, and transfers and replaces the storage barrel 43 containing a large amount of ammonium sulfate. Finally, the waste gas after the purification reaction is discharged from the exhaust pipe 81.

[0032] After the No. 1 spray rack 16 in S1 sprays the dilute sulfuric acid solution to react with the exhaust gas, the filter plate 6 filters the liquid, and the output end of the No. 2 servo motor 7 drives the scraper 72 and the exhaust fan blade 73 on the rotating rod 71 to rotate simultaneously. The scraper 72 scrapes and collects the impurities on the filter plate 6 into the storage tank 61, and the exhaust fan blade 73 rotates to pump the exhaust gas and accelerate it to be discharged from the exhaust pipe 81.

[0033] Working process: When purifying the waste gas generated by the production of basic zinc carbonate, first connect the air inlet pipe 11 to the waste gas channel to inject the waste gas into the purification tower 1. During the first stage of waste gas purification, the waste gas rises to the No. 1 spray rack 16 through the recovery mechanism. The No. 1 water pump 12 is started and cooperates with the No. 1 liquid inlet pipe 13 to extract the dilute sulfuric acid solution through the No. 1 liquid outlet pipe 14 and send it to the guide ring 15. The guide ring 15 guides the dilute sulfuric acid solution to the bottom of the No. 1 spray rack 16 for spraying. The dilute sulfuric acid solution first reacts with the ammonia in the waste gas. , the ammonium sulfate aqueous solution formed by the reaction is mixed with part of the unreacted dilute sulfuric acid solution and falls at the recovery mechanism. The recovery mechanism sends the mixed aqueous solution to the No. 2 spray rack 17 to start the second stage of exhaust gas purification. The recycled mixed aqueous solution is used at the No. 2 spray rack 17 to perform a preliminary reaction on the introduced exhaust gas to reduce the waste of dilute sulfuric acid solution. Subsequently, the exhaust gas of the preliminary reaction rises to the No. 1 spray rack 16 for a secondary spray reaction. The purified exhaust gas is finally discharged from the top of the purification tower 1, which has the effect of recycling the unreacted dilute sulfuric acid solution and reducing the spraying amount and cost of the dilute sulfuric acid solution. When the dilute sulfuric acid solution sprayed on the No. 1 spray rack 16 is recovered, the guide block 22 is used to guide the mixed aqueous solution to flow down to the inside of the collecting cylinder 21. The mixed aqueous solution is drained into the guide assembly through the sloped inner wall at the bottom of the collecting cylinder 21. The guide assembly sends the mixed aqueous solution to the No. 2 spray rack 17 for spraying. The exhaust gas after the reaction at the No. 2 spray rack 17 passes through the air flow groove between the fixed plate 2 and the collecting cylinder 21. It rises to the No. 1 spray rack 16 to react again, which plays the role of collecting the mixed aqueous solution. When the mixed aqueous solution in the collecting cylinder 21 is recycled, the input end of the No. 2 water pump 3 cooperates with the No. 2 liquid inlet pipe 31 to extract the mixed aqueous solution from the bottom end of the collecting cylinder 21, and then the mixed aqueous solution is sent to the No. 2 spray rack 17 for spraying through the No. 2 liquid outlet pipe 32. The sprayed mixed aqueous solution undergoes a first preliminary reaction with the newly introduced exhaust gas, which plays the role of recycling the mixed aqueous solution and reducing the waste of resources. After the sprayed dilute sulfuric acid solution reacts with the ammonia in the exhaust gas, the ammonium sulfate aqueous solution formed by the reaction falls through the funnel mouth 44 and is temporarily stored in the storage barrel 43. The No. 1 servo motor 41 rotates intermittently according to the liquid inflow of the dilute sulfuric acid solution at the No. 1 liquid inlet pipe 13. The output end of the No. 1 servo motor 41 drives the rotating disk 42 supported on the support frame 4 to rotate, and the storage barrel 43 filled with the ammonium sulfate aqueous solution is transferred out of the purification tower 1, and at the same time, another empty storage barrel 43 is sent into the interior of the purification tower 1. Subsequently, the storage barrel 43 filled with the ammonium sulfate aqueous solution is recycled and stored and replaced with the empty storage barrel 43, thereby recovering the ammonium sulfate aqueous solution. When the exhaust gas enters the interior of the purification tower 1 from the air inlet pipe 11, the No. 3 spray rack 51 is used to cooperate with the guide pipe 5 to connect with the air inlet pipe 11. The exhaust gas entering the air inlet pipe 11 flows through the guide pipe 5 to the No. 3 spray rack 51 and is evenly dispersed and discharged from the multiple exhaust holes at the top of the No. 3 spray rack 51. The No. 2 spray rack 17 evenly sprays the mixed aqueous solution for reaction, thereby improving the purification reaction effect of the exhaust gas. When the No. 1 spray rack 16 sprays the dilute sulfuric acid solution to react with the ammonia in the exhaust gas, if the raw materials are impure, the reaction conditions are inappropriate, or the equipment material is not corrosion-resistant, some particulate impurities, such as ammonium sulfate crystals, metal ions, and insoluble particles, are easily generated. The filter plate 6 is used to filter the solution after the reaction to reduce the particulate impurities in the mixed solution, and the impurities are temporarily stored in the storage tank 61 for cleaning. When the particulate impurities adhere to the filter plate 6, the output end of the No. 2 servo motor 7 drives the rotating rod 71 to rotate slowly, and the scraper 72 rotates with the rotating rod 71 to scrape the impurities on the filter plate 6, and the impurities are temporarily stored in the storage tank 61, which plays a role in cleaning the impurities on the surface of the filter plate 6. At the same time, the No. 1 spray rack 16 rotates at the bottom of the guide ring 15 with the rotating rod 71, and the No. 1 spray rack 16 evenly sprays the dilute sulfuric acid solution to react, thereby improving the exhaust gas purification effect, and the exhaust fan blades 73 also rotate synchronously with the rotating rod 71, and the exhaust fan blades 73 exhaust air to accelerate the exhaust of the exhaust gas. When purifying a small amount of exhaust gas, the exhaust gas is discharged through the exhaust holes on the periphery of the No. 3 spray rack 51, and reacts with the mixed water solution sprayed on the periphery of the No. 2 spray rack 17. When purifying a large amount of exhaust gas, the power of the No. 2 water pump 3 is increased to open the pressure relief valve inside the No. 2 spray rack 17, and a large amount of exhaust gas is sent into the interior of the purification tower 1. The pressure relief valve inside the No. 3 spray rack 51 is also opened. Relying on the large-caliber nozzles 8 installed on the No. 2 spray rack 17 and the No. 3 spray rack 51, the synchronous spraying and exhaust reaction of the periphery is coordinated, and the spraying mode is changed according to the amount of exhaust gas to improve the reaction effect on the exhaust gas. The exhaust pipe 81 guides the purified exhaust gas to be discharged, and can also introduce the exhaust gas into the purifier to purify other gases.

[0034] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste gas purification device for the production of basic zinc carbonate, characterized by: It includes a purification tower; an air inlet pipe is fixedly connected to the outer wall of the purification tower; a water pump is fixedly connected to the surface of the support plate above the outer wall of the purification tower; the input end and output end of the water pump are respectively fixedly connected to a liquid inlet pipe and a liquid outlet pipe, the No. 1 liquid inlet pipe is located outside the purification tower, and the No. 1 liquid outlet pipe is located inside the purification tower; the end of the No. 1 liquid outlet pipe away from the No. 1 water pump is fixedly connected to a guide ring; the bottom end of the guide ring is rotatably connected to a spray rack No. 1; a No. 2 spray rack is arranged inside the purification tower and below the No. 1 spray rack; a recovery mechanism is arranged inside the purification tower, and the recovery mechanism is used to recover part of the unreacted dilute sulfuric acid solution after spraying by the No. 1 spray rack and return it to the No. 2 spray rack for secondary spraying.

2. A basic zinc carbonate production waste gas purification device according to claim 1, characterized in that: The recovery mechanism includes a fixed plate, a collecting tube, a guide block and a guide assembly; the fixed plate is fixedly connected to the middle inner wall of the purification tower; the collecting tube is fixedly connected to the inner wall of the fixed plate, the bottom inner wall of the collecting tube is sloped, and an air flow groove is formed between the fixed plate and the collecting tube; the guide block is fixedly connected to the end of the fixed plate; the guide assembly is arranged on the purification tower, and the guide assembly is used to send the liquid collected in the collecting tube to the No. 2 spray rack for spraying.

3. A basic zinc carbonate production waste gas purification device according to claim 2, characterized in that: The diversion assembly includes a No. 2 water pump, a No. 2 liquid inlet pipe and a No. 2 liquid outlet pipe; the No. 2 water pump is fixedly connected to the support plate below the outer wall of the purification tower; the No. 2 liquid inlet pipe is fixedly connected to the input end of the No. 2 water pump, and the end of the No. 2 liquid inlet pipe away from the No. 2 water pump is fixedly connected to the middle bottom end of the collecting cylinder; the No. 2 liquid outlet pipe is fixedly connected to the output end of the No. 2 water pump, and the end of the No. 2 liquid outlet pipe away from the No. 2 water pump is fixedly connected to the end of the No. 2 spray rack.

4. The exhaust gas purification equipment for basic zinc carbonate production according to claim 1, characterized in that: The bottom outer wall of the purification tower is fixedly connected to a support frame; the bottom outer wall of the purification tower is fixedly connected to a No. 1 servo motor, and the No. 1 servo motor is located between the purification tower and the support frame; the output end of the No. 1 servo motor is fixedly connected to a rotating disk, and a plurality of circular grooves are provided on the rotating disk; storage barrels are respectively placed in the plurality of circular grooves of the rotating disk; a funnel opening is provided inside the purification tower and above the rotating disk, and the funnel opening corresponds to the circular grooves.

5. The exhaust gas purification equipment for basic zinc carbonate production according to claim 1, characterized in that: The end of the air inlet pipe close to the purification tower is fixedly connected to a guide pipe; the top of the end of the guide pipe away from the air inlet pipe is fixedly connected to a No. 3 spray rack, and the No. 3 spray rack is arranged opposite to the No. 2 spray rack.

6. The exhaust gas purification equipment for basic zinc carbonate production according to claim 2, characterized in that: A filter screen is fixedly connected to the inner wall of the collecting cylinder; and a storage slot is provided on the filter screen.

7. The exhaust gas purification equipment for basic zinc carbonate production according to claim 6, characterized in that: A No. 2 servo motor is fixedly connected to the top of the purification tower; a rotating rod is fixedly connected to the output end of the No. 2 servo motor, and a No. 1 spray rack is fixedly connected to the rotating rod; a scraper is fixedly connected to the outer wall of the rotating rod, and the scraper is attached to the upper surface of the filter plate; an exhaust fan blade is fixedly connected to the outer wall of the rotating rod and located above the guide ring.

8. The exhaust gas purification equipment for basic zinc carbonate production according to claim 5, characterized in that: The central outer walls of the No. 2 spray rack and the No. 3 spray rack are both equipped with large-diameter nozzles through pressure relief valves; and a discharge pipe is fixedly connected to the top of the purification tower.

9. A method for purifying waste gas from the production of basic zinc carbonate, the method using the waste gas purification equipment for the production of basic zinc carbonate according to any one of claims 1 to 8, characterized in that: The steps of this method are as follows: S1: First, the waste gas generated by the production of basic zinc carbonate is introduced into the interior of the purification tower through the air inlet pipe. The No. 1 water pump extracts dilute sulfuric acid solution through the No. 1 liquid inlet pipe and sends it to the bottom of the No. 1 spray rack connected to the guide ring through the No. 1 liquid outlet pipe for spraying. The ammonia in the waste gas reacts with the dilute sulfuric acid solution to form ammonium sulfate, which falls. The ammonium sulfate and some unreacted dilute sulfuric acid solution are collected in the collection cylinder; S2: The No. 2 water pump then extracts the liquid from the collection cylinder through the No. 2 liquid inlet pipe and sends it to the bottom of the No. 2 spray rack for spraying. The exhaust gas is evenly distributed through the guide pipe and the No. 3 spray rack and discharged into the interior of the purification tower. Some unreacted dilute sulfuric acid solution reacts with the incoming exhaust gas first; S3: The ammonium sulfate produced by the final multiple reactions falls into the storage barrel through the funnel mouth. The No. 1 servo motor controls the rotation of the rotating disk according to the inflow of the dilute sulfuric acid solution at the No. 1 liquid inlet pipe, and transfers and replaces the storage barrel containing a large amount of ammonium sulfate. Finally, the waste gas after the purification reaction is discharged from the exhaust pipe.

10. The method for purifying waste gas from the production of basic zinc carbonate according to claim 9, characterized in that: After the No. 1 spray rack in S1 sprays the dilute sulfuric acid solution to react with the exhaust gas, the filter plate filters the liquid, and the output end of the No. 2 servo motor drives the scraper and the exhaust fan blades on the rotating rod to rotate simultaneously. The scraper scrapes and collects the impurities on the filter plate in the storage tank, and the exhaust fan blades rotate to pump the exhaust gas and accelerate it to be discharged from the exhaust pipe.

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