Exhaust emission device for producing polyaluminum chloride and production and preparation method of polyaluminum chloride

Abstract

The invention relates to the technical field of waste gas emission devices, and particularly discloses a waste gas emission device for producing polyaluminum chloride and a production and preparation method thereof.The waste gas emission device comprises a main tower, a condensation box is fixedly installed in the main tower, and a water tank is fixedly installed on the inner side of the condensation box; a condensation channel is formed from the upper end face to the lower end face of the condensation box, and first limiting blocks are fixedly installed in the condensation channel in a staggered mode. A water pump is arranged below the water tank, a spraying conveying pipe is fixedly installed at the lower end of the water pump, and first limiting blocks of a staggered structure are arranged in a condensation channel, so that the retention time of waste gas can be prolonged when the waste gas passes through the condensation device, and then the condensation box can completely liquefy moisture in the waste gas; therefore, the waste gas is prevented from containing moisture in the subsequent operation, the retention time is prolonged, the heat transfer effect is enhanced, the liquefaction speed of water vapor and easily condensed pollutants is increased, and the condensation recovery efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas emission devices, and more particularly to a waste gas emission device for producing polyaluminum chloride and its production preparation method. Background Art

[0002] Polyaluminum chloride (PAC) is an inorganic substance, a new type of water purification material, an inorganic polymer coagulant, abbreviated as polyaluminum. It is a water-soluble inorganic polymer. It has a high degree of electro-neutralization and bridging effect on colloids and particulate matters in water, and can strongly remove micro-toxic substances and heavy metal ions. Its properties are stable. Due to the bridging effect of hydroxide ions and the polymerization effect of polyvalent anions, the produced polyaluminum chloride is an inorganic polymer water treatment agent with a relatively large molecular weight and a relatively high charge.

[0003] In the production of polyaluminum chloride, a waste gas emission device is required to treat the production waste gas. However, the existing waste gas emission devices have an unsatisfactory purification effect on the waste gas during use. Since polyaluminum chloride has a certain toxicity, the direct discharge of production waste gas will not only affect the surrounding environment, but also cause physical damage to the surrounding operators, thus making it inconvenient for people to use.

[0004] For example, in the currently available waste gas treatment devices, during the use process, due to the short residence time of the waste gas inside the in-line condensation device, the condensation device cannot completely liquefy the moisture in the waste gas, which will affect the treatment result in the subsequent process, and finally the waste gas is still in a harmful state when discharged; secondly, for the liquefied moisture, it is only simply recycled in the current market, resulting in waste of moisture.

[0005] Therefore, in order to improve the treatment effect of waste gas and the utilization of the condensed moisture, a waste gas emission device for producing polyaluminum chloride is specifically proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a waste gas emission device for producing polyaluminum chloride and its production preparation method to solve the problems raised in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A waste gas emission device for producing polyaluminum chloride, including the main tower, a condensation box is fixedly installed inside the main tower, and a water tank is fixedly installed inside the condensation box; A condensation channel is opened from the upper end surface to the lower end surface of the condensation box, and a first limiting block is fixedly installed inside the condensation channel in a staggered manner; A water pump is arranged below the water tank, a spray delivery pipe is fixedly installed at the lower end of the water pump, and spray water pipes are fixedly installed at the lower end of the delivery pipe in a uniformly annular array; A spherical cover is fixedly installed below the water spray pipe inside the main tower, and air inlet holes are evenly arranged in a circular array from the outside to the inside of the spherical cover.

[0008] Preferably, a ring groove is formed inside the lower end of the water tank, a connecting pipe head is fixedly installed at the upper end of the water pump, and the connecting pipe head is rotatably installed inside the ring groove.

[0009] By adopting the above technical solution, the connecting pipe head can perform a rotating operation under the action of the ring groove.

[0010] Preferably, a servo motor is fixedly installed on the outer side surface of the main tower, a main bevel gear is fixedly installed inside the main tower on the output shaft of the servo motor, a sub-bevel gear is fixedly installed on the circumferential surface of the conveying pipe, and the sub-bevel gear meshes with the main bevel gear.

[0011] By adopting the above technical solution, the main bevel gear can be driven to rotate under the action of the servo motor, so that the sub-bevel gear can drive the conveying pipe to rotate.

[0012] Preferably, a cold water filter screen is fixedly installed inside the main tower, the lower end of the conveying pipe passes through the cold water filter screen, and through drain holes are formed at the positions of the lower end corners of the spherical cover.

[0013] By adopting the above technical solution, the liquefied solution can be filtered under the action of cold water filtration, avoiding the fusion of impurities and newly entered waste gas.

[0014] Preferably, a water outlet channel is formed from the inner lower end surface to the outside of the main tower, a through hole is formed from the outer lower end to the inside of the main tower, a U-shaped sliding groove is fixedly installed inside the main tower, one end of the U-shaped sliding groove is flush with the through hole, and a sewage filter screen is slidably installed inside the U-shaped sliding groove.

[0015] By adopting the above technical solution, the sewage filter screen can be supported under the action of the U-shaped sliding groove, ensuring the operation of the sewage filter screen.

[0016] Preferably, an activated carbon plate is fixedly installed above the condensation box at the upper end inside the main tower, filtering channels are evenly formed from the upper end surface to the lower end surface of the activated carbon plate, and second limiting blocks are fixedly installed in a staggered manner inside the filtering channels.

[0017] By adopting the above technical solution, the impurities in the waste gas can be adsorbed under the action of the activated carbon plate, thereby avoiding the discharge of harmful substances in the waste gas.

[0018] Preferably, above the activated carbon plate inside the main tower, a first drying layer, a second drying layer, and a third drying layer are fixedly installed in sequence from bottom to top. The pore sizes of the first drying layer, the second drying layer, and the third drying layer are inconsistent and gradually decrease from bottom to top.

[0019] By adopting the above technical solution, under the action of the first drying layer, the second drying layer, and the third drying layer, the waste gas can be dried, thereby improving the treatment effect on the waste gas.

[0020] Preferably, a controller is fixedly installed on the outer side surface of the main tower, a dust collector is fixedly installed at the upper end of the main tower, a chute opening is formed at the lower end of one side of the dust collector, and a collection box is slidably installed inside the chute opening.

[0021] By adopting the above technical solution, under the action of the control gas, the condensation box can be started and stopped, ensuring that the condensation box can be in a suitable operating state.

[0022] Preferably, air inlet pipes are fixedly installed on both sides of the dust collector in a staggered manner, blowers are fixedly installed above the air inlet pipes, a three-way pipe is fixedly installed above the blowers, an air outlet pipe is fixedly installed from the upper end face to the inside of the dust collector, a connecting pipe is fixedly installed at the upper end of the air outlet pipe, and the lower end of the connecting pipe is fixedly connected to and penetrates the main tower.

[0023] By adopting the above technical solution, under the action of the blower, the waste gas can be extracted, ensuring the volume and flow rate of the waste gas flow.

[0024] The present invention also provides a production preparation method for producing polyaluminum chloride, using the above waste gas emission device, including the following steps: S1: Crush industrial aluminum hydroxide and calcium aluminate to make their particle sizes meet the production requirements, and at the same time prepare 31% hydrochloric acid as the reaction raw material; S2: Put the raw materials after crushing and hydrochloric acid into the reaction kettle in proportion, start the stirring device, and react at 95 °C for 4 hours. During the reaction, waste gas containing dust particles and hydrogen chloride components will be generated. Pump the product into a filter press for filtration, and the obtained filtrate is subjected to aging and basicity adjustment, and then steam heated and dried into a solid. The solid is in the form of flakes or powder, and is packaged and stored in the warehouse as a finished product; S3: Start the blower, introduce the waste gas generated by the reaction into the three-way pipe, and then into the air inlet pipe. Subsequently, the waste gas enters the dust collector. Inside the dust collector, the dust particles in the waste gas are separated by centrifugal force, and the separated waste gas enters the main tower through the air outlet pipe; S4: The waste gas enters the main tower and passes through the spherical cover. At this time, the water pump is started. The water pump transports the sodium hydroxide solution in the water tank to the delivery pipe and sprays it through the spray pipe. The sodium hydroxide solution reacts with the acidic gas in the waste gas to neutralize the reaction and reduce the acidity of the waste gas. S5: Start the servo motor. Its output shaft drives the main bevel gear to rotate. The main bevel gear drives the driven bevel gear to rotate, so that the driven bevel gear drives the delivery pipe to rotate, enabling the sodium hydroxide solution sprayed by the spray pipe to contact and react with the waste gas more evenly. S6: The waste gas after acid-base neutralization treatment passes through the cold water filter screen and enters the condensation box. Inside the condensation box, the waste gas contacts the first limiting block in the condensation channel. Through the condensation effect, the condensable components such as water vapor in the waste gas condense, further purifying the waste gas. S7: The condensed waste gas enters the activated carbon plate, passes through the filter channel, and successively passes through the first drying layer, the second drying layer, and the third drying layer. The activated carbon plate adsorbs the residual impurities in the waste gas, and the multi-layer drying layers remove the moisture in the waste gas. Finally, the treated waste gas is discharged from the pipeline.

[0025] By adopting the above technical solution, under the action of the above technical solution, it is possible to carry out the emission operation of waste gas during the production of polyaluminum chloride and ensure the production of polyaluminum chloride.

[0026] Compared with the prior art, the beneficial effects of the present invention are: 1. In the present invention, during the use process, due to the internally arranged first limiting block with a dislocation structure in the condensation channel, the residence time of the waste gas when passing through the condensation device will increase. As a result, the condensation box can completely liquefy the moisture in the waste gas, thus avoiding the situation that the waste gas still contains moisture in subsequent operations, prolonging the residence time, enhancing the heat transfer effect, accelerating the liquefaction speed of water vapor and easily condensable pollutants, and improving the condensation recovery efficiency. Secondly, under the action of the activated carbon plate and the second limiting block, the residence time of the waste gas can be increased, thereby increasing the contact area between the activated carbon and the odor substances, improving the adsorption rate and adsorption capacity, and enhancing the deodorization efficiency.

[0027] 2. In the present invention, under the action of the cold water filter screen, the cooled liquid can be filtered. The filtered water can be fused with the waste gas entering the main tower, thereby improving the utilization of the moisture in the liquefaction, reducing the waste of resources. Moreover, due to the action of the cold water filter screen, the filtering effect on the waste gas is further improved.

[0028] 3. In the present invention, under the action of the water tank, the temperature of the condensation box can be reduced, reducing the use of a part of the electric energy. Secondly, under the action of the first drying layer, the second drying layer, and the third drying layer, different impurities in the waste gas can be processed to ensure that the moisture in the waste gas is completely removed. Brief Description of the Drawings

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic external view structure diagram of the main body of the present invention; Figure 2 It is a schematic connection diagram of the dust collector and the air inlet pipe of the present invention; Figure 3 It is a schematic internal structure diagram of the main tower of the present invention; Figure 4 It is a schematic diagram of the sewage filter screen and the U-shaped chute of the present invention; Figure 5 It is a schematic diagram of the condensation box and the spherical cover of the present invention; Figure 6 It is a schematic diagram of the annular groove and the connecting pipe head of the present invention; Figure 7 It is a schematic diagram of the first limiting block of the present invention; Figure 8 It is a schematic diagram of the second limiting block of the present invention.

[0031] Explanation of the reference numerals in the drawings: 1. Main tower; 101. Water outlet channel; 102. Through hole; 103. U-shaped chute; 104. Sewage filter screen; 105. Cold water filter screen; 2. Dust collector; 201. Chute opening; 202. Collection box; 203. Air inlet pipe; 204. Fan; 205. Three-way pipe; 206. Air outlet pipe; 207. Connecting pipe; 3. Water tank; 301. Annular groove; 302. Connecting pipe head; 303. Water pump; 304. Sub-conical gear; 305. Water spray pipe; 306. Spherical cover; 307. Air inlet hole; 308. Drain hole; 309. Servo motor; 310. Main conical gear; 311. Delivery pipe; 4. Condensation box; 401. Condensation channel; 402. First limiting block; 403. Controller; 5. Activated carbon plate; 501. Filter channel; 502. Second limiting block; 503. First drying layer; 504. Second drying layer; 505. Third drying layer. Detailed Embodiments

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figures 1 to 8 , the present invention provides a technical solution: An exhaust gas emission device for producing polyaluminum chloride, including a main tower 1. Among them, a dust collector 2 is fixedly installed at the top of the main tower 1, as Figure 1 shown; a chute opening 201 with a rectangular structure is provided at the front end of the dust collector 2, and the structure passing through the chute opening 201 into the dust collector 2 is a collection box 202. During use, operators can draw out and slide in the collection box 202, so as to collect and recycle the fallen dust inside the collection box 202, avoid too much dust inside the collection box 202 from affecting the dust particle separation operation inside the dust collector 2, and avoid excessive dust accumulation inside the collection box 202, as Figure 2 shown.

[0034] The dust collector 2 is fixedly installed with intake pipes 203 on both the left and right sides in a misaligned state. At the top of both intake pipes 203, a fan 204 is fixedly installed. At the upper ends of the two fans 204, a tee pipe 205 is fixedly installed together. The top of the tee pipe 205 is used for fixedly connecting with the waste pipe of the reaction kettle. In this way, the generated waste gas can enter the dust collector 2. During use, in order to ensure that there is enough centrifugal force to separate the dust particles in the waste gas, therefore, the fan 204 is used to make the waste gas enter the dust collector 2 in a spiral rotation state. Then, in the case of high-speed rotation, the separation operation of the waste gas and dust particles is realized, and the flow rate of the waste gas is ensured, as Figure 2 shown.

[0035] A vertical exhaust pipe 206 is fixedly installed from the center position of the upper end face of the dust collector 2 to the inside of the dust collector 2. During the operation process, the lower end of the exhaust pipe 206 allows the waste gas after dust separation to enter. At the top of the exhaust pipe 206, a symmetric connecting pipe 207 is fixedly installed, so as to carry out the diversion operation of the waste gas, as Figure 2 shown.

[0036] The lower end of the connecting pipe 207 is fixedly installed on the lower side surface of the main tower 1. Therefore, the waste gas passes through the connecting pipe 207 and enters the main tower 1 for the next process, as Figure 3 shown.

[0037] The bottom surface of the main tower 1 is provided with a water outlet channel 101 in an L-shaped structure on the outside for discharging the liquid after subsequent spraying. Then, a through hole 102 is provided from the left side surface to the inside of the main tower 1. Two U-shaped chutes 103 are fixedly installed inside the main tower 1. One end of the U-shaped chute 103 is flush with the through hole 102, and the length of the through hole 102 is the same as the length between the two U-shaped chutes 103. Therefore, during use, the sewage filter net 104 can slide through the through hole 102 and be installed inside the U-shaped chute 103, so as to filter the liquid after spraying. And under the action of the through hole 102, the sewage filter net 104 can be replaced, such as Figure 3 and Figure 4 shown.

[0038] A condensation box 4 is fixedly installed at the middle position inside the main tower 1, and a controller 403 is fixedly installed on the outer side surface of the main tower 1. The controller 403 is electrically connected to the condensation box 4. Under the action of the controller 403, the temperature of the condensation box 4 can be adjusted. Therefore, the condensation box 4 can liquefy the waste gas in subsequent operations. A water tank 3 is fixedly installed inside the condensation box 4, and the inside of the water tank 3 is filled with a liquid that is fused with the waste gas for fusing the chemical substances inside the waste gas. It should be noted that to ensure the sufficiency of the liquid inside the water tank 3, the water tank 3 needs to be connected through a pipeline to the outside, so as to ensure that the water tank 3 will not lack or be insufficient in liquid. The specific connection can be set according to the actual situation, such as Figure 5 shown.

[0039] An annular groove 301 is provided inside the lower end of the water tank 3, and a connecting pipe head 302 is rotatably installed inside the annular groove 301. The lower end of the connecting pipe head 302 extends to the outside of the lower end of the water tank 3, and a water pump 303 is fixedly installed at its lower end, such as Figure 6 shown.

[0040] A delivery pipe 311 is fixedly installed at the lower end of the water pump 303, and spray pipes 305 evenly distributed in an annular array are fixedly installed at the lower end of the delivery pipe 311; Secondly, a spherical cover 306 is fixedly installed below the spray pipes 305 inside the main tower 1. The spherical cover 306 has a semi-circular structure, and the inside is a cavity structure, and a plurality of air inlet holes 307 are evenly opened in an annular array from the outer side surface to the inner side surface, such as Figure 5 shown.

[0041] Therefore, during use, the waste gas entering the main tower 1 will, due to upward movement, enter the interior of the spherical cover 306 and then pass through the intake holes 307. At this time, the water pump 303 is started. Under the action of the connecting pipe head 302, the water pump 303 can extract the liquid in the water tank 3, then transport it into the interior of the delivery pipe 311, and finally spray it out through the spray holes on the spray pipe 305, thereby enabling the operation of spraying the floating waste gas.

[0042] During the spraying process, to prevent the liquid from accumulating outside the spherical cover 306, drain holes 308 are provided at the lower corners of the spherical cover 306. Through the drain holes 308, the sprayed liquid can pass through and then fall onto the surface of the sewage filter net 104 for filtering operation.

[0043] Secondly, a secondary bevel gear 304 is fixedly installed on the circumferential surface of the delivery pipe 311, and two symmetrically arranged servo motors 309 are fixedly installed on the outer side surface of the main tower 1. A main bevel gear 310 is fixedly installed on the output shaft of the servo motor 309 inside the main tower 1. The main bevel gear 310 and the secondary bevel gear 304 are in a meshing state. When the servo motor 309 is started, the output shaft of the servo motor 309 will drive the main bevel gear 310 to rotate. During the rotation of the main bevel gear 310, it will drive the secondary bevel gear 304 to rotate, thereby enabling the delivery pipe 311 to rotate synchronously. The delivery pipe 311 will drive the spray pipe 305 and the water pump 303 to rotate synchronously, and the water pump 303 will drive the connecting pipe head 302 to rotate, so as to rotate inside the main tower 1, thus preventing the spray pipe 305 from being in a stationary state for a long time and avoiding the situation of incomplete spraying.

[0044] Secondly, a cold water filter net 105 is fixedly installed below the secondary bevel gear 304 inside the main tower 1. The lower end of the delivery pipe 311 passes through the cold water filter net 105, and the two are in a rotating connection state. Therefore, during the rotation of the delivery pipe 311, the cold water filter net 105 will not have any impact on it. As the waste gas moves upward, it will enter the interior of the condensation box 4 and then enter the interior of the condensation channel 401. Due to the restriction of the first limiting block 402 inside the condensation channel 401 at this time, the waste gas stays in the condensation channel 401 for a longer time. Therefore, during use, the water molecules in the waste gas will gradually liquefy under the action of the condensation channel 401, and the liquefied water molecules will fall onto the surface of the cold water filter net 105. Then, under the action of the cold water filter net 105, the liquefied water can be filtered, and the filtered water will be fused with the newly entering waste gas, thereby realizing the utilization of water, as Figure 5 shown.

[0045] The condensed waste gas will continue to move upward. At this time, an activated carbon plate 5 is fixedly installed above the condensation box 4 at the upper end inside the main tower 1. A filter channel 501 is evenly opened from the upper end face to the lower end face of the activated carbon plate 5. Second limiting blocks 502 in a staggered state are fixedly installed inside the filter channel 501. Therefore, during use, due to the action of the second limiting blocks 502, the residence time of the waste gas in the activated carbon plate 5 will be longer. Therefore, there is sufficient time to adsorb the substances in the waste gas, thus completing the filtration of the waste gas.

[0046] Then, a first drying layer 503, a second drying layer 504, and a third drying layer 505 are fixedly installed in sequence above the activated carbon plate 5 at the upper end inside the main tower 1. The adsorbed waste gas will pass through the first drying layer 503, the second drying layer 504, and the third drying layer 505 in sequence. Under the action of the first drying layer 503, the second drying layer 504, and the third drying layer 505, the waste gas can be dried. In this way, the waste gas can be further in a dry state. After the waste gas passes through the third drying layer 505, it will be discharged through the pipes on both sides of the upper end of the main tower 1. In this way, the discharge and purification of the waste gas are completed through the cooperation of the above-mentioned multiple structures, avoiding the situation of waste gas polluting the air, as Figure 8 and Figure 1 shown.

[0047] Secondly, in the production and preparation of polyaluminum chloride, waste gas will affect production. Therefore, during use, the waste gas needs to be treated. The generated waste gas will enter the inside of the main tower 1 for filtration. The specific steps are as follows: S1: Crush industrial aluminum hydroxide and calcium aluminate to make their particle sizes meet the production requirements. At the same time, prepare 31% hydrochloric acid as the reaction raw material; S2: Put the raw materials after crushing and hydrochloric acid into the reaction kettle in proportion, start the stirring device, and react at 95°C for 4 hours. During the reaction, waste gas containing dust particles and hydrogen chloride components will be generated. Pump the product into a plate filter for pressure filtration. The obtained filtrate is subjected to ripening and basicity adjustment, and then steam-heated and dried into a solid. The solid is in flake or powder form and is warehoused as a finished product after packaging; S3: Start the fan 204, introduce the waste gas generated by the reaction into the three-way pipe 205, and then into the air inlet pipe 203. Subsequently, the waste gas enters the dust collector 2. Inside the dust collector, the dust particles in the waste gas are separated by centrifugal force. The separated waste gas enters the main tower 1 through the air outlet pipe 206; S4: The waste gas enters the main tower 1 and passes through the spherical cover 306. At this time, the water pump 303 is started. The water pump 303 transports the sodium hydroxide solution in the water tank 3 to the delivery pipe 311 and sprays it through the spray pipe 305. The sodium hydroxide solution reacts with the acidic gas in the waste gas to neutralize the reaction and reduce the acidity of the waste gas. S5: Start the servo motor 309. Its output shaft drives the main bevel gear 310 to rotate. The main bevel gear 310 drives the secondary bevel gear 304 to rotate, causing the secondary bevel gear to drive the delivery pipe 311 to rotate, so that the sodium hydroxide solution sprayed by the spray pipe 305 can react with the waste gas more evenly. S6: The waste gas after acid-base neutralization treatment passes through the cold water filter screen 105 and enters the condensation box 4. Inside the condensation box 4, the waste gas contacts the first limiting block 402 in the condensation channel 401. Through the condensation effect, the condensable components such as water vapor in the waste gas condense, further purifying the waste gas. S7: The condensed waste gas enters the activated carbon plate 5, passes through the filter channel 501, and successively passes through the first drying layer 503, the second drying layer 504, and the third drying layer 505. The activated carbon plate adsorbs the residual impurities in the waste gas, and the multi-layer drying layer removes the moisture in the waste gas. Finally, the treated waste gas is discharged from the pipeline.

[0048] Working principle: First, under the action of the fan 204, the waste gas enters the inside of the tee 205, then enters the inside of the intake pipe 203, and finally enters the inside of the dust collector 2. Under the action of centrifugal force, the dust particles in the waste gas are removed.

[0049] The waste gas passes through the outlet pipe 206 and enters the inside of the connecting pipe 207, and then enters the inside of the main tower 1.

[0050] The waste gas passes through the spherical cover 306 and then passes through the cold water filter screen 105 and enters the inside of the condensation box 4. The water pump 303 is started. Under the action of the connecting pipe head 302, the water pump 303 extracts the liquid inside the water tank 3 and transports it to the inside of the delivery pipe 311, and finally sprays it through the spray pipe 305 to spray the waste gas.

[0051] After spraying, the sewage passes through the drain hole 308, drops onto the sewage filter screen 104, and finally is discharged through the water outlet channel 101.

[0052] The waste gas is liquefied under the action of the condensation box 4, the condensation channel 401, and the first limiting block 402. The liquefied solution drops onto the cold water filter screen 105, and the cold water filter screen 105 operates on it.

[0053] The waste gas passes through the condensation channel 401 and enters the filtration channel 501 of the activated carbon plate 5, where impurities in the waste gas are adsorbed under the action of the second limiting block 502. Then, the waste gas passes through the first drying layer 503, the second drying layer 504, and the third drying layer 505 one by one, and finally is discharged.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waste gas emission device for producing polyaluminium chloride, comprising the main tower (1), characterized in that: A condensation box (4) is fixedly installed inside the main tower (1), and a water tank (3) is fixedly installed inside the condensation box (4); A condensation channel (401) is provided from the upper end surface to the lower end surface of the condensation box (4), and a first limit block (402) is fixedly installed in a staggered manner inside the condensation channel (401); A water pump (303) is provided below the water tank (3), a spray delivery pipe (311) is fixedly mounted at the lower end of the water pump (303), and water spray pipes (305) are evenly fixedly mounted in a circular array at the lower end of the delivery pipe (311); A spherical cover (306) is fixedly installed inside the main tower (1) below the water spray pipe (305), and air inlet holes (307) are evenly arranged in a circular array from the outside to the inside of the spherical cover (306).

2. A waste gas discharge device for producing polyaluminium chloride according to claim 1, characterized in that: An annular groove (301) is provided inside the lower end of the water tank (3), and a connecting pipe head (302) is fixedly mounted on the upper end of the water pump (303), wherein the connecting pipe head (302) is rotatably mounted inside the annular groove (301).

3. A waste gas emission device for producing polyaluminium chloride according to claim 1, characterized in that: A servo motor (309) is fixedly mounted on the outer surface of the main tower (1); a main bevel gear (310) is fixedly mounted on the output shaft of the servo motor (309) and located inside the main tower (1); a secondary bevel gear (304) is fixedly mounted on the circumferential surface of the delivery pipe (311); the secondary bevel gear (304) is meshed with the main bevel gear (310).

4. A waste gas discharge device for producing polyaluminium chloride according to claim 1, characterized in that: A cold water filter (105) is fixedly installed inside the main tower (1), the lower end of the delivery pipe (311) passes through the cold water filter (105), and a through drain hole (308) is provided at the lower corner of the spherical cover (306).

5. A waste gas discharge device for producing polyaluminium chloride according to claim 1, characterized in that: A water outlet channel (101) is provided from the inner lower end surface of the main tower (1) to the outer side, a through opening (102) is provided from the lower end outer side to the inner side of the main tower (1), a U-shaped slide groove (103) is fixedly installed inside the main tower (1), one end of the U-shaped slide groove (103) is flush with the through opening (102), and a sewage filter screen (104) is slidably installed inside the U-shaped slide groove (103).

6. A waste gas discharge device for producing polyaluminium chloride according to claim 5, characterized in that: An activated carbon plate (5) is fixedly mounted on the upper inner end of the main tower (1) located above the condensation box (4), a filter channel (501) is evenly provided from the upper end surface to the lower end surface of the activated carbon plate (5), and a second limit block (502) is fixedly mounted in an offset manner inside the filter channel (501).

7. A waste gas discharge device for producing polyaluminium chloride according to claim 5, characterized in that: The interior of the main tower (1) is located above the activated carbon plate (5), and a first drying layer (503), a second drying layer (504), and a third drying layer (505) are arranged and fixedly installed in sequence upward, wherein the pore sizes of the first drying layer (503), the second drying layer (504), and the third drying layer (505) are inconsistent and decrease in sequence upward.

8. A waste gas discharge device for producing polyaluminium chloride according to claim 1, characterized in that: A controller (403) is fixedly mounted on the outer surface of the main tower (1), a dust collector (2) is fixedly mounted on the upper end of the main tower (1), a slide groove opening (201) is provided at the lower end of one side of the dust collector (2), and a collection box (202) is slidably mounted inside the slide groove opening (201).

9. A waste gas discharge device for producing polyaluminium chloride according to claim 1, characterized in that: Air inlet pipes (203) are fixedly installed in a staggered manner on both sides of the dust collector (2); fans (204) are fixedly installed above the air inlet pipes (203); a three-way pipe (205) is fixedly installed above the fan (204); an air outlet pipe (206) is fixedly installed from the upper end surface to the inside of the dust collector (2); a connecting pipe (207) is fixedly installed at the upper end of the air outlet pipe (206); and the lower end of the connecting pipe (207) is fixedly connected to and passes through the main tower (1).

10. A method for producing polyaluminium chloride, referring to the waste gas emission device for producing polyaluminium chloride as claimed in any one of claims 1 to 9, characterized in that: The steps include: S1: crush industrial aluminum hydroxide and calcium aluminate to make their particle size meet production requirements, and prepare 31% hydrochloric acid as a reaction raw material; S2: The crushed raw materials and hydrochloric acid are put into the reactor in proportion, the stirring device is turned on, and the reaction is carried out at 95℃ for 4 hours. During the reaction, waste gas containing dust particles and hydrogen chloride components will be generated. The product is pumped into the filter press for filtration, and the filtrate is matured and the salt base is adjusted before steam heating and drying into a solid. The solid is in the form of flakes or powder, and the finished product is stored after packaging; S3: Turn on the fan (204) to introduce the waste gas generated by the reaction into the three-way pipe (205), and then into the air inlet pipe (203). The waste gas then enters the dust collector (2). In the dust collector, the dust particles in the waste gas are separated by centrifugal force. The separated waste gas enters the main tower (1) through the air outlet pipe (206); S4: the exhaust gas enters the main tower (1) and passes through the spherical cover (306). At this time, the water pump (303) is started. The water pump (303) transports the sodium hydroxide solution in the water tank (3) to the transport pipe (311) and sprays it out through the water spray pipe (305). The sodium hydroxide solution reacts with the acidic gas in the exhaust gas to reduce the acidity of the exhaust gas. S5: starting the servo motor (309), and the output shaft thereof drives the main bevel gear (310) to rotate, and the main bevel gear (310) drives the secondary bevel gear (304) to rotate, so that the secondary bevel gear drives the delivery pipe (311) to rotate, so that the sodium hydroxide solution sprayed from the water spray pipe (305) can be more evenly contacted and reacted with the exhaust gas; S6: the waste gas after the acid-base neutralization treatment passes through the cold water filter (105) and enters the condensation box (4). In the condensation box (4), the waste gas contacts the first limit block (402) in the condensation channel (401). Through the condensation effect, the condensable components of water vapor in the waste gas are condensed, thereby further purifying the waste gas. S7: The condensed waste gas enters the activated carbon plate (5), passes through the filter channel (501), and passes through the first drying layer (503), the second drying layer (504) and the third drying layer (505) in sequence. The activated carbon plate absorbs the residual impurities in the waste gas, and the multiple drying layers remove moisture from the waste gas. Finally, the treated waste gas is discharged from the pipeline.

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