Wastewater treatment and discharge equipment for alkali recovery boiler

Abstract

The invention discloses wastewater treatment and discharge equipment for an alkali recovery boiler, and belongs to the technical field of wastewater treatment.The wastewater treatment and discharge equipment comprises a main body mechanism used for feeding wastewater, a treatment mechanism used for treating the wastewater is arranged on the main body mechanism, and a filtering mechanism used for filtering and discharging impurities is arranged on the treatment mechanism; according to the main body mechanism, large impurities in wastewater can be filtered firstly, then corresponding acid liquor is added according to the flow of the wastewater for preliminary neutralization, and the subsequent wastewater treatment efficiency is improved; the treatment mechanism provided by the invention can add an acid solution and a flocculant into wastewater for multiple times, and continuously stir the wastewater in the flocculation process to neutralize alkaline wastewater and flocculate flocculatable impurities, so that subsequent filtration and separation are facilitated; the filtering mechanism can separate waste water from flocculation impurities in the waste water, the waste water is finally discharged, the filtered impurities can be scraped off, and the filter screen is prevented from being blocked.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and particularly relates to a wastewater treatment and discharge device for an alkali recovery boiler. Background Art

[0002] An alkali recovery boiler is a device that generates steam by absorbing the heat of high-temperature flue gas. It is an essential industrial device in modern pulp mills. Its use meets the requirements of environmental protection and is also an important device for achieving economical production. However, after long-term operation of the alkali recovery boiler, a large amount of impurities and wastewater will be generated in the furnace. These impurities and wastewater are characterized by high alkalinity, high COD, and high impurities, and need to be specially treated to meet the discharge requirements before they can be discharged. The wastewater treatment and discharge device of the alkali recovery boiler needs to balance efficiency, environmental protection, and economy; when treating the wastewater of the alkali recovery boiler, acid solution needs to be added. In the prior art, the addition of acid solution cannot be automatically matched according to the amount of wastewater, and the automatic separation of other impurities in the wastewater cannot be achieved. Summary of the Invention

[0003] In view of the above technical problems, the technical solution adopted by the present invention is: a wastewater treatment and discharge device for an alkali recovery boiler, including a main body mechanism for feeding wastewater, the main body mechanism includes an alkali recovery boiler, a treatment mechanism for treating wastewater is arranged on the main body mechanism, the treatment mechanism includes a mixing tank, and a filtering mechanism for filtering and discharging impurities is arranged on the treatment mechanism; The main body mechanism includes a water suction pipe, and an acid addition module for adding acid solution is arranged on the water suction pipe; The filtering mechanism includes a liquid inlet pipe, two filter pipes are fixedly installed on the liquid inlet pipe, a filter cylinder is rotatably installed in the filter pipe, and an inner sliding column is slidably installed in the filter pipe.

[0004] Further, the main body mechanism further includes a separation cylinder fixedly installed on the alkali recovery boiler, a switch plate is slidably installed on the separation cylinder, an inclined hole plate is fixedly installed in the separation cylinder, a plurality of holes are arranged on the inclined hole plate, a water pump is fixedly installed on the separation cylinder, and the water pump is fixedly installed with the water suction pipe.

[0005] Further, the acid addition module includes a fan blade shell fixedly installed on the water suction pipe, a fan blade is rotatably installed in the fan blade shell, an impeller gear is fixedly installed on the fan blade, a lower gear is rotatably installed on the fan blade shell, a pushing wheel is fixedly installed on the lower gear, the impeller gear meshes with the lower gear, and teeth are arranged on the impeller gear.

[0006] Further, an acid inlet pipe is fixedly installed on the water extraction pipe. The acid inlet pipe is connected to an external acid liquid tank. A fixed orifice plate is fixedly installed in the acid inlet pipe. A number of liquid inlet holes are provided on the fixed orifice plate. A sliding orifice plate is slidably installed in the acid inlet pipe. A pushing rack is fixedly installed on the sliding orifice plate. Teeth are provided on the pushing rack. The pushing rack is engaged with the impeller gear. A number of liquid through holes are provided on the sliding orifice plate. A return spring is provided between the sliding orifice plate and the acid inlet pipe. When the impeller gear does not push the pushing rack and the sliding orifice plate, the liquid through holes of the sliding orifice plate are offset from the liquid inlet holes of the fixed orifice plate.

[0007] The alkaline waste liquid water in the alkali recovery boiler enters the separation cylinder. Large debris in the waste liquid is isolated by the inclined orifice plate. Then the waste liquid reaches below the inclined orifice plate and is then pumped into the fan blade housing by a water pump. The waste liquid will push the fan blade and the impeller gear to rotate, thereby driving the lower gear and the pushing wheel to rotate. When the impeller gear contacts the teeth of the pushing rack during the rotation of the pushing wheel, it will push the pushing rack and the sliding orifice plate to slide in the acid inlet pipe, and the return spring is compressed. At this time, the liquid through holes on the sliding orifice plate are aligned with the liquid inlet holes of the fixed orifice plate, and the acid liquid enters the water extraction pipe from the acid inlet pipe to preliminarily adjust the pH value of the waste water. When the teeth of the impeller gear are offset from the teeth of the pushing rack, the return spring rebounds, and the liquid through holes on the sliding orifice plate are offset from the liquid inlet holes of the fixed orifice plate. As the fan blade rotates continuously, the pushing wheel rotates continuously, and the sliding orifice plate slides back and forth relative to the fixed orifice plate continuously. The more the number of rotations of the impeller gear per unit time, the more times the liquid through holes of the sliding orifice plate are aligned with the liquid inlet holes of the fixed orifice plate, and the more acid liquid enters the water extraction pipe, that is, the more alkaline waste water, the more acid liquid is added, so that the amount of acid liquid is adapted to the amount of alkaline waste water.

[0008] Further, the treatment mechanism includes a discharge pipe fixedly installed on the mixing tank. The mixing tank is fixedly installed with the water extraction pipe. Four droppers and four pH meters are fixedly installed on the mixing tank. The droppers are electrically connected to the pH meters. Two droppers are filled with acid liquid, and two droppers are filled with flocculant. The discharge pipe is fixedly installed with the inlet pipe.

[0009] Further, a number of partition plates are provided in the mixing tank. A number of stirring impellers are rotatably installed on the mixing tank. Stirring gears are fixedly installed on the stirring impellers. A motor is fixedly installed on the mixing tank. The motor drives the stirring gear to rotate through belt drive.

[0010] The waste liquid after adding acid liquid enters the mixing tank after preliminary neutralization. The waste water flows in the mixing tank. The stirring impeller rotates to stir the waste water. The droppers add acid liquid and flocculant to the waste water to adjust the pH value of the waste water and flocculate the fine impurities in the waste water. The pH value of the waste water is detected by the pH meter to control the amount of acid liquid added to the water by the dropper. The treated waste water enters the inlet pipe through the discharge pipe.

[0011] The filtering mechanism further includes a filtering motor fixedly installed on the filtering pipe. The filtering motor drives the filter cylinder to rotate through a belt drive. A number of filter meshes are fixedly installed on the filter cylinder, and a number of slag discharge grooves are arranged on the filter cylinder.

[0012] Further, an outflow cavity and a slag discharge cavity are arranged inside the filtering pipe. A number of water outlets are arranged on the filtering pipe, and the water outlets are located outside the outflow cavity.

[0013] Further, an electric cylinder is fixedly installed on the filtering pipe. The output end of the electric cylinder is fixedly installed with an inner sliding column. A scraping disc is fixedly installed on the inner sliding column. The scraping disc slides inside the filtering pipe. A top connecting rod is slidably installed inside the scraping disc. An inner spring is arranged between the top connecting rod and the scraping disc. A closing plate is fixedly installed on the top connecting rod. The closing plate slides inside the liquid inlet pipe. The inner sliding column can rotate and slide relative to the filter cylinder.

[0014] After the wastewater enters the liquid inlet pipe, it enters the filter cylinder. The rotation of the filter cylinder drives the filter meshes to rotate together. The flocculated impurities in the wastewater are filtered through the filter meshes. The filtered wastewater enters the outflow cavity and then is discharged from the water outlet. When the electric cylinder extends, it drives the inner sliding column to slide inside the filter cylinder. The impurities filtered by the filter meshes are pushed to the slag discharge groove by the scraping disc. Then the impurities enter the slag discharge cavity and are finally discharged. When the electric cylinder extends, the inner spring drives the top connecting rod and the closing plate to slide together. The closing plate seals the space between the liquid inlet pipe and the filtering pipe, so that the wastewater no longer enters the filtering pipe and the filter cylinder. As the inner sliding column continues to slide, the inner spring is stretched, and the closing plate keeps the liquid inlet pipe and the filtering pipe sealed, improving the filtering effect.

[0015] The beneficial effects of the present invention compared with the prior art are as follows: (1) The main body mechanism provided by the present invention can first filter the large impurities in the wastewater, and then add corresponding acid solution for preliminary neutralization according to the flow rate of the wastewater, improving the subsequent wastewater treatment efficiency; (2) The treatment mechanism provided by the present invention can add acid solution and flocculant to the wastewater multiple times, and continuously stir the wastewater during the flocculation process to neutralize the alkaline wastewater and flocculate the flocculable impurities, facilitating subsequent filtration and separation; (3) The filtering mechanism provided by the present invention can separate the wastewater from the flocculated impurities therein, finally discharge the wastewater, and can scrape off the filtered impurities to prevent the filter meshes from being blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the main body mechanism of the present invention Figure 1 .

[0018] Figure 3 It is a schematic diagram of the structure of the main body mechanism of the present invention Figure 2 .

[0019] Figure 4 Schematic diagram of the main body structure of the present invention Figure 3 。

[0020] Figure 5 Schematic diagram of the processing mechanism structure of the present invention Figure 1 。

[0021] Figure 6 Schematic diagram of the processing mechanism structure of the present invention Figure 2 。

[0022] Figure 7 Schematic diagram of the filtering mechanism structure of the present invention Figure 1 。

[0023] Figure 8 Schematic diagram of the filtering mechanism structure of the present invention Figure 2 。

[0024] Figure 9 Schematic diagram of the filtering mechanism structure of the present invention Figure 3 。

[0025] Figure 10 Schematic diagram of the filtering mechanism structure of the present invention Figure 4 。

[0026] Figure 11 Schematic diagram of the filtering mechanism structure of the present invention Figure 5 。

[0027] Reference numerals in the attached drawings: 101 - Alkali recovery boiler; 102 - Separation cylinder; 103 - Switch plate; 104 - Oblique orifice plate; 105 - Water pump; 106 - Fan blade housing; 107 - Water suction pipe; 108 - Acid inlet pipe; 109 - Fan blade; 110 - Driving wheel; 111 - Impeller gear; 112 - Lower gear; 113 - Sliding orifice plate; 114 - Driving rack; 115 - Fixed orifice plate; 116 - Return spring; 201 - Mixing tank; 202 - Motor; 203 - Dropper; 204 - pH meter; 205 - Discharge pipe; 206 - Stirring impeller; 207 - Stirring gear; 208 - Partition board; 301 - Inner spring; 302 - Filtering motor; 303 - Electric cylinder; 304 - Liquid inlet pipe; 305 - Filtering pipe; 306 - Water outlet; 307 - Filter cartridge; 308 - Filter screen; 309 - Inner sliding column; 310 - Scraping disc; 311 - Top connecting rod; 312 - Sealing plate; 313 - Slag discharge chute; 314 - Slag discharge cavity; 315 - Flow-out cavity. Detailed implementation manners

[0028] The following further describes the detailed implementation manners of the present invention with reference to the accompanying drawings.

[0029] Example: Refer to Figures 1 - 11, A wastewater treatment and discharge device for an alkali recovery boiler, comprising a main body mechanism for feeding wastewater. The main body mechanism includes an alkali recovery boiler 101. A treatment mechanism for treating wastewater is provided on the main body mechanism. The treatment mechanism includes a mixing tank 201. A filtering mechanism for filtering and discharging impurities is provided on the treatment mechanism; The main body mechanism includes a water suction pipe 107, and an acid adding module for adding acid liquid is provided on the water suction pipe 107; The filtering mechanism includes a liquid inlet pipe 304. Two filter pipes 305 are fixedly installed on the liquid inlet pipe 304. A filter cylinder 307 is rotatably installed in the filter pipe 305, and an inner sliding column 309 is slidably installed in the filter pipe 305.

[0030] As Figures 2 - 4 shown, the main body mechanism further includes a separation cylinder 102 fixedly installed on the alkali recovery boiler 101. A switch plate 103 is slidably installed on the separation cylinder 102. An inclined hole plate 104 is fixedly installed in the separation cylinder 102. A number of holes are provided on the inclined hole plate 104. A water pump 105 is fixedly installed on the separation cylinder 102, and the water pump 105 is fixedly installed with the water suction pipe 107.

[0031] As Figures 2 - 4 shown, the acid adding module includes a fan blade housing 106 fixedly installed on the water suction pipe 107. A fan blade 109 is rotatably installed in the fan blade housing 106. An impeller gear 111 is fixedly installed on the fan blade 109. A lower gear 112 is rotatably installed on the fan blade housing 106. A push wheel 110 is fixedly installed on the lower gear 112. The impeller gear 111 meshes with the lower gear 112, and teeth are provided on the impeller gear 111.

[0032] As Figures 2 - 4 shown, an acid inlet pipe 108 is fixedly installed on the water suction pipe 107. The acid inlet pipe 108 is connected to an external acid liquid tank. A fixed orifice plate 115 is fixedly installed in the acid inlet pipe 108. A number of liquid inlet holes are provided on the fixed orifice plate 115. A sliding orifice plate 113 is slidably installed in the acid inlet pipe 108. A push rack 114 is fixedly installed on the sliding orifice plate 113. Teeth are provided on the push rack 114. The push rack 114 cooperates with the impeller gear 111. A number of liquid through holes are provided on the sliding orifice plate 113. A return spring 116 is provided between the sliding orifice plate 113 and the acid inlet pipe 108. When the impeller gear 111 does not push the push rack 114 and the sliding orifice plate 113, the liquid through holes of the sliding orifice plate 113 are staggered from the liquid inlet holes of the fixed orifice plate 115.

[0033] The alkaline waste liquid in the alkali recovery boiler 101 enters the separation cylinder 102, and the large debris in the waste liquid is isolated by the inclined orifice plate 104. The waste liquid reaches the bottom of the inclined orifice plate 104, and then the waste liquid is pumped into the fan blade housing 106 by the water pump 105. The waste liquid will drive the fan blade 109 and the impeller gear 111 to rotate, thereby driving the lower gear 112 and the driving wheel 110 to rotate. When the driving wheel 110 rotates, when the impeller gear 111 contacts the teeth of the driving gear rod 114, it will drive the driving gear rod 114 and the sliding orifice plate 113 to slide in the acid inlet pipe 108, and the return spring 116 is compressed. At this time, the liquid through hole on the sliding orifice plate 113 is aligned with the liquid inlet hole of the fixed orifice plate 115, and the acid enters from the acid inlet pipe 108. To the suction pipe 107, the pH value of the wastewater is preliminarily adjusted. When the teeth of the impeller gear 111 are offset from the teeth of the pushing gear rod 114, the return spring 116 rebounds, and the liquid hole on the sliding orifice plate 113 is offset from the liquid inlet hole of the fixed orifice plate 115. As the fan blades 109 continue to rotate, the pushing wheel 110 is driven to rotate continuously, and the sliding orifice plate 113 continuously slides back and forth relative to the fixed orifice plate 115. The more circles the impeller gear 111 rotates per unit time, the more times the liquid hole of the sliding orifice plate 113 is aligned with the liquid inlet hole of the fixed orifice plate 115, and the more acid enters the suction pipe 107, that is, the more alkaline wastewater there is, the more acid is added, so that the amount of acid is adapted to the amount of alkaline wastewater.

[0034] like Figure 5 , Figure 6 As shown, the treatment mechanism includes a discharge pipe 205 fixedly installed on the mixing box 201, the mixing box 201 is fixedly installed with the pumping pipe 107, four droppers 203 and four pH meters 204 are fixedly installed on the mixing box 201, the droppers 203 are electrically connected to the pH meters 204, two droppers 203 are filled with acid liquid, two droppers 203 are filled with flocculants, and the discharge pipe 205 is fixedly installed with the liquid inlet pipe 304.

[0035] like Figure 5 , Figure 6 As shown, a plurality of partitions 208 are provided in the mixing box 201, a plurality of stirring impellers 206 are rotatably mounted on the mixing box 201, a stirring gear 207 is fixedly mounted on the stirring impeller 206, a motor 202 is fixedly mounted on the mixing box 201, and the motor 202 drives the stirring gear 207 to rotate through a belt drive.

[0036] After the acid is added, the waste liquid is initially neutralized and then enters the mixing box 201. The waste water flows in the mixing box 201, and the stirring impeller 206 rotates to stir the waste water. The dropper 203 adds acid and flocculant to the waste water to adjust the pH value of the waste water and flocculate the fine impurities in the waste water. The pH value of the waste water is detected by the pH meter 204 to control the amount of acid added to the water by the dropper 203. The treated waste water enters the liquid inlet pipe 304 through the discharge pipe 205.

[0037] As Figures 7 - 11 shown, the filtering mechanism further includes a filtering motor 302 fixedly installed on the filtering pipe 305. The filtering motor 302 drives the filter cartridge 307 to rotate through belt drive. A number of filter meshes 308 are fixedly installed on the filter cartridge 307, and a number of slag discharge grooves 313 are arranged on the filter cartridge 307.

[0038] As Figures 7 - 11 shown, an outflow chamber 315 and a slag discharge chamber 314 are arranged in the filtering pipe 305. A number of water outlets 306 are arranged on the filtering pipe 305, and the water outlets 306 are located outside the outflow chamber 315.

[0039] As Figures 7 - 11 shown, an electric cylinder 303 is fixedly installed on the filtering pipe 305. The output end of the electric cylinder 303 is fixedly installed with an inner sliding column 309. A scraping disc 310 is fixedly installed on the inner sliding column 309. The scraping disc 310 slides in the filtering pipe 305. A top connecting rod 311 is slidably installed in the scraping disc 310. An inner spring 301 is arranged between the top connecting rod 311 and the scraping disc 310. A closing plate 312 is fixedly installed on the top connecting rod 311. The closing plate 312 slides in the liquid inlet pipe 304. The inner sliding column 309 can rotate and slide relative to the filter cartridge 307.

[0040] After the wastewater enters the liquid inlet pipe 304, it enters the filter cartridge 307. The rotation of the filter cartridge 307 drives the filter meshes 308 to rotate together. The flocculated impurities in the wastewater are filtered through the filter meshes 308. The filtered wastewater enters the outflow chamber 315 and then is discharged from the water outlets 306. When the electric cylinder 303 extends, it drives the inner sliding column 309 to slide in the filter cartridge 307. The impurities filtered by the filter meshes 308 are pushed to the slag discharge grooves 313 by the scraping disc 310. Then the impurities enter the slag discharge chamber 314 and are finally discharged. When the electric cylinder 303 extends, the inner spring 301 drives the top connecting rod 311 and the closing plate 312 to slide together. The closing plate 312 closes the space between the liquid inlet pipe 304 and the filtering pipe 305, so that the wastewater no longer enters the filtering pipe 305 and the filter cartridge 307. As the inner sliding column 309 continues to slide, the inner spring 301 is stretched, and the closing plate 312 keeps the liquid inlet pipe 304 and the filtering pipe 305 closed, improving the filtering effect.

[0041] The working principle of the wastewater treatment and discharge equipment for alkali recovery boiler disclosed in the present invention is as follows: the alkaline waste liquid in the alkali recovery boiler 101 enters the separation cylinder 102, and the large debris in the waste liquid is isolated by the inclined orifice plate 104, and the waste liquid reaches the bottom of the inclined orifice plate 104, and then the waste liquid is pumped into the fan blade shell 106 by the water pump 105, and the waste liquid will push the fan blade 109 and the impeller gear 111 to rotate, thereby driving the lower gear 112 and the driving wheel 110 to rotate. When the driving wheel 110 rotates, when the impeller gear 111 contacts the teeth of the driving gear rod 114, it will push the driving gear rod 114 and the sliding orifice plate 113 to slide in the acid inlet pipe 108, and the return spring 116 is compressed. At this time, the liquid through hole on the sliding orifice plate 113 and the liquid inlet hole of the fixed orifice plate 115 are in contact with each other. Aligned, the acid enters the water extraction pipe 107 from the acid inlet pipe 108, and the pH value of the wastewater is preliminarily adjusted. When the teeth of the impeller gear 111 are staggered with the teeth of the pushing gear rod 114, the return spring 116 rebounds, and the liquid hole on the sliding orifice plate 113 is staggered with the liquid inlet hole of the fixed orifice plate 115. As the fan blades 109 continue to rotate, the driving wheel 110 is driven to rotate continuously, and the sliding orifice plate 113 continuously slides back and forth relative to the fixed orifice plate 115. The more circles the impeller gear 111 rotates per unit time, the more times the liquid hole of the sliding orifice plate 113 is aligned with the liquid inlet hole of the fixed orifice plate 115, and the more acid enters the water extraction pipe 107, that is, the more alkaline wastewater there is, the more acid is added, so that the amount of acid is adapted to the amount of alkaline wastewater. After the acid is added, the waste liquid is initially neutralized and then enters the mixing box 201. The waste water flows in the mixing box 201, and the stirring impeller 206 rotates to stir the waste water. The dropper 203 adds acid and flocculant to the waste water to adjust the pH value of the waste water and flocculate the fine impurities in the waste water. The pH value of the waste water is detected by the pH meter 204 to control the amount of acid added to the water by the dropper 203. The treated waste water enters the liquid inlet pipe 304 through the discharge pipe 205. After the wastewater enters the liquid inlet pipe 304, it enters the filter cartridge 307. The filter cartridge 307 rotates to drive the filter screen 308 to rotate together. The impurities after flocculation in the wastewater are filtered through the filter screen 308. The filtered wastewater enters the outflow chamber 315 and is then discharged from the water outlet 306. The electric cylinder 303 extends to drive the inner sliding column 309 to slide in the filter cartridge 307. The scraper 310 pushes the impurities filtered by the filter screen 308 to the slag outlet 313. Then the impurities enter The waste water is finally discharged from the slag discharge chamber 314. When the electric cylinder 303 is extended, the inner spring 301 drives the top connecting rod 311 and the closing plate 312 to slide together, and the closing plate 312 closes the liquid inlet pipe 304 and the filter tube 305, so that the waste water no longer enters the filter tube 305 and the filter cartridge 307. As the inner sliding column 309 continues to slide, the inner spring 301 is stretched, and the closing plate 312 keeps the liquid inlet pipe 304 and the filter tube 305 closed, thereby improving the filtering effect.

[0042] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope of the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A wastewater treatment and discharge device for an alkali recovery boiler, comprising a main body mechanism for feeding wastewater, characterized in that: The main body mechanism comprises an alkali recovery boiler (101), the main body mechanism is provided with a treatment mechanism for treating wastewater, the treatment mechanism comprises a mixing box (201), and the treatment mechanism is provided with a filtering mechanism for filtering and discharging impurities; The main body structure comprises a water pumping pipe (107), and an acid adding module for adding acid liquid is arranged on the water pumping pipe (107); The filtering mechanism comprises a liquid inlet pipe (304), on which two filtering pipes (305) are fixedly mounted, a filter cartridge (307) is rotatably mounted in the filtering pipe (305), and an inner sliding column (309) is slidably mounted in the filtering pipe (305).

2. The wastewater treatment and discharge equipment for alkali recovery boiler according to claim 1, characterized in that: The main body structure further comprises a separation cylinder (102) fixedly mounted on the alkali recovery boiler (101); a switch plate (103) is slidably mounted on the separation cylinder (102); an inclined hole plate (104) is fixedly mounted inside the separation cylinder (102); a plurality of holes are provided on the inclined hole plate (104); a water pump (105) is fixedly mounted on the separation cylinder (102); and the water pump (105) is fixedly mounted on a water pump pipe (107).

3. The wastewater treatment and discharge equipment for alkali recovery boiler according to claim 2 is characterized in that: The acid addition module comprises a fan blade housing (106) fixedly mounted on a water pumping pipe (107), a fan blade (109) rotatably mounted in the fan blade housing (106), an impeller gear (111) fixedly mounted on the fan blade (109), a lower gear (112) rotatably mounted on the fan blade housing (106), a driving wheel (110) fixedly mounted on the lower gear (112), the impeller gear (111) meshing with the lower gear (112), and teeth being arranged on the impeller gear (111).

4. The wastewater treatment and discharge equipment for alkali recovery boiler according to claim 3 is characterized by: An acid inlet pipe (108) is fixedly mounted on the water pumping pipe (107). The acid inlet pipe (108) is connected to an external acid tank. A fixed orifice plate (115) is fixedly mounted in the acid inlet pipe (108). The fixed orifice plate (115) is provided with a plurality of liquid inlet holes. A sliding orifice plate (113) is slidably mounted in the acid inlet pipe (108). A pushing gear rod (114) is fixedly mounted on the sliding orifice plate (113). The pushing gear rod (114) is provided with teeth. The pushing gear rod (114) cooperates with the impeller gear (111). The sliding orifice plate (113) is provided with a plurality of liquid through holes. A return spring (116) is arranged between the sliding orifice plate (113) and the acid inlet pipe (108). When the impeller gear (111) does not push the pushing gear rod (114) and the sliding orifice plate (113), the liquid through holes of the sliding orifice plate (113) are staggered with the liquid inlet holes of the fixed orifice plate (115).

5. The wastewater treatment and discharge equipment for alkali recovery boiler according to claim 1, characterized in that: The treatment mechanism comprises a discharge pipe (205) fixedly mounted on a mixing box (201); the mixing box (201) is fixedly mounted on a water pumping pipe (107); four droppers (203) and four pH meters (204) are fixedly mounted on the mixing box (201); the droppers (203) are electrically connected to the pH meters (204); two droppers (203) are filled with acid liquid; two droppers (203) are filled with flocculants; and the discharge pipe (205) is fixedly mounted on a liquid inlet pipe (304).

6. The wastewater treatment and discharge equipment for alkali recovery boiler according to claim 5, characterized in that: A plurality of partitions (208) are arranged in the mixing box (201), a plurality of stirring impellers (206) are rotatably mounted on the mixing box (201), a stirring gear (207) is fixedly mounted on the stirring impeller (206), a motor (202) is fixedly mounted on the mixing box (201), and the motor (202) drives the stirring gear (207) to rotate via a belt drive.

7. The wastewater treatment and discharge equipment for alkali recovery boiler according to claim 1, characterized in that: The filtering mechanism further comprises a filtering motor (302) fixedly mounted on the filtering tube (305); the filtering motor (302) drives the filter cartridge (307) to rotate via a belt transmission; a plurality of filter screens (308) are fixedly mounted on the filter cartridge (307); and a plurality of slag discharge grooves (313) are provided on the filter cartridge (307).

8. The wastewater treatment and discharge equipment for alkali recovery boiler according to claim 7, characterized in that: An outflow cavity (315) and a slag discharge cavity (314) are provided in the filter tube (305), and a plurality of water outlets (306) are provided on the filter tube (305), wherein the water outlets (306) are located outside the outflow cavity (315).

9. The wastewater treatment and discharge equipment for alkali recovery boiler according to claim 8, characterized in that: An electric cylinder (303) is fixedly mounted on the filter tube (305); the output end of the electric cylinder (303) is fixedly mounted on the inner sliding column (309); a scraper (310) is fixedly mounted on the inner sliding column (309); the scraper (310) slides in the filter tube (305); a top connecting rod (311) is slidably mounted in the scraper (310); an inner spring (301) is provided between the top connecting rod (311) and the scraper (310); a closing plate (312) is fixedly mounted on the top connecting rod (311); the closing plate (312) slides in the liquid inlet tube (304); and the inner sliding column (309) is rotatable and slidable relative to the filter cartridge (307).

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