A waste gas discharging device for producing polyaluminum chloride and a production method thereof

Abstract

The application 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, which comprises a main tower, a condensing box is fixedly installed in the inside of the main tower, and a water tank is fixedly installed on the inside of the condensing box; a condensing channel is arranged from the upper end surface to the lower end surface of the condensing box, and a first limiting block is fixedly installed in the inside of the condensing channel in a staggered mode; a water pump is arranged below the water tank, and a conveying pipe is fixedly installed at the lower end of the water pump; because the first limiting block in the staggered structure is arranged in the inside of the condensing channel, the residence time of waste gas is increased when the waste gas passes through the condensing device, the condensing box can completely liquefy the water in the waste gas, the waste gas still contains water in subsequent operation is avoided, the residence time is prolonged, the heat transfer effect is strengthened, the liquefaction speed of water vapor and easily-condensed pollutants is accelerated, and the condensing recovery efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas emission device, in particular to a waste gas emission device for producing polyaluminum chloride and a production and preparation method thereof. BACKGROUND

[0002] Polyaluminum chloride (PAC) is an inorganic substance, a new type of water purification material and inorganic polymer coagulant, which is also called polyaluminum. It is a water-soluble inorganic polymer, which has high electric neutralization and bridging effect on colloids and particles in water, and can strongly remove micro-toxic substances and heavy metal ions. It is stable in nature. Due to the bridging effect of hydroxyl ions and the polymerization of multivalent anions, the produced polyaluminum chloride is an inorganic polymer water treatment agent with relatively large molecular weight and high charge.

[0003] In the production of polyaluminum chloride, a waste gas emission device is needed to treat the production waste gas. However, the existing waste gas emission device has unsatisfactory purification effect on waste gas. Since polyaluminum chloride has certain toxicity, direct discharge of production waste gas will not only affect the surrounding environment, but also cause physical damage to the surrounding workers, thereby being inconvenient for people to use.

[0004] As for the waste gas treatment device on the market, the residence time of waste gas in the inline condensing device is short, so that the condensing device cannot completely liquefy the water in the waste gas, which affects the treatment result in the subsequent process, and finally leads to the waste gas still being in a harmful state when discharged. Secondly, the liquefied water is only recycled on the market, causing waste of water.

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

[0006] The present application aims to provide a waste gas emission device for producing polyaluminum chloride and a production and preparation method thereof to solve the problems in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a waste gas emission device for producing polyaluminum chloride, comprising a main tower, a condensing box fixedly installed inside the main tower, and a water tank fixedly installed on the inner side of the condensing box.

[0008] A condensing channel is formed from the upper end face to the lower end face of the condensing box, and a first limiting block is fixedly installed in the condensing channel in a staggered manner.

[0009] The lower part of the water tank is provided with a water pump, the lower end of the water pump is fixedly installed with a conveying pipe, and the lower end of the conveying pipe is uniformly fixedly installed with a water spraying pipe in an annular array.

[0010] The inside of the main tower is fixedly installed with a spherical cover below the water spraying pipe, and the outside to the inside of the spherical cover is uniformly provided with an air inlet hole in an annular array.

[0011] Preferably, the inside of the lower end of the water tank is provided with an annular groove, the upper end of the water pump is fixedly installed with a connecting pipe head, and the connecting pipe head is rotatably installed in the inside of the annular groove.

[0012] By adopting the above technical scheme, the connecting pipe head can be rotated under the action of the annular groove.

[0013] Preferably, a servo motor is fixedly installed on the outer side of the main tower, a main conical gear is fixedly installed on the output shaft of the servo motor inside the main tower, a secondary conical gear is fixedly installed on the circumferential surface of the conveying pipe, and the secondary conical gear is engaged with the main conical gear.

[0014] By adopting the above technical scheme, the main conical gear can be driven to rotate under the action of the servo motor, so that the secondary conical gear can rotate with the conveying pipe.

[0015] Preferably, a cold water filter screen is fixedly installed in the inside of the main tower, the lower end of the conveying pipe passes through the cold water filter screen, and the lower end corners of the spherical cover are provided with through water drain holes.

[0016] By adopting the above technical scheme, the filtered solution can be filtered under the action of the cold water filter, avoiding the fusion of impurities and newly entering waste gas.

[0017] Preferably, a water outlet channel is provided from the inside lower end surface to the outside of the main tower, a through hole is provided from the outside to the inside of the lower end of the main tower, a U-shaped sliding groove is fixedly installed in the inside of 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 in the inside of the U-shaped sliding groove.

[0018] By adopting the above technical scheme, the sewage filter screen can be supported under the action of the U-shaped sliding groove, ensuring the operation of the sewage filter screen.

[0019] Preferably, an activated carbon plate is fixedly installed in the inside of the main tower above the condensing box, filter channels are uniformly provided from the upper end surface to the lower end surface of the activated carbon plate, and second limiting blocks are fixedly installed in the inside of the filter channels in a staggered manner.

[0020] By adopting the above technical scheme, the impurities in the waste gas can be adsorbed under the action of the activated carbon plate, so that the harmful substances in the waste gas can be prevented from being discharged.

[0021] Preferably, the interior of the main tower is above the activated carbon plate, and a first drying layer, a second drying layer and a third drying layer are sequentially arranged and fixedly installed upwards, the pore diameters of the first drying layer, the second drying layer and the third drying layer are inconsistent, and sequentially decrease upwards.

[0022] By adopting the above technical scheme, the waste gas can be dried under the action of the first drying layer, the second drying layer and the third drying layer, so that the treatment effect of the waste gas is improved.

[0023] Preferably, a controller is fixedly installed on the outer side of the main tower, a dust remover 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 remover, and a collection box is slidably installed in the interior of the chute opening.

[0024] By adopting the above technical scheme, the condensing box can be started and stopped under the action of the control gas, so that the condensing box can be in a suitable working state.

[0025] Preferably, air inlet pipes are fixedly installed in a staggered manner on both sides of the dust remover, fans are fixedly installed above the air inlet pipes, three-way pipes are fixedly installed above the fans, air outlet pipes are fixedly installed from the upper end surface to the interior of the dust remover, a connecting pipe is fixedly installed at the upper end of the air outlet pipe, and the connecting pipe is fixedly connected with the main tower and penetrates through.

[0026] By adopting the above technical scheme, the waste gas can be extracted under the action of the fan, so that the capacity and flow rate of the waste gas flow are ensured.

[0027] The application also provides a production and preparation method of polyaluminum chloride, which uses the above waste gas discharge device and comprises the following steps:

[0028] S1: industrial aluminum hydroxide and calcium aluminate are crushed to meet the production requirements, and 31% hydrochloric acid is prepared as a reaction raw material;

[0029] S2: the crushed raw materials and the hydrochloric acid are proportionally put into a reaction kettle, a stirring device is started, and 95°C reaction is carried out for 4 hours. In the reaction process, waste gas containing dust particles and hydrogen chloride components is generated,

[0030] The product is pumped into a filter press for pressure filtration, the obtained filtrate is matured and adjusted for base degree, then is steam heated, dried into a solid, and packaged into a warehouse as a finished product;

[0031] S3: a fan is started, the generated waste gas is introduced into a three-way pipe, and then into an air inlet pipe, and then the waste gas enters a dust remover. In the dust remover, the dust particles in the waste gas are separated by centrifugal force, and the separated waste gas enters a main tower through an air outlet pipe.

[0032] S4: The exhaust gas enters the main tower and passes through the spherical hood. At this time, the water pump is started. The water pump delivers the sodium hydroxide solution in the water tank to the delivery pipe and sprays it out through the spray pipe. The sodium hydroxide solution reacts with the acidic gas in the exhaust gas to reduce the acidity of the exhaust gas.

[0033] S5: Start the servo motor, whose output shaft drives the main bevel gear to rotate, and the main bevel gear drives the secondary bevel gear to rotate, so that the secondary bevel gear drives the conveying pipe to rotate, allowing the sodium hydroxide solution sprayed from the water spray pipe to react more evenly with the exhaust gas.

[0034] S6: After acid-base neutralization treatment, the exhaust gas passes through the cold water filter and enters the condensation box. Inside the condensation box, the exhaust gas comes into contact with the first limiting block in the condensation channel. Through condensation, the condensable components such as water vapor in the exhaust gas are condensed, further purifying the exhaust gas.

[0035] S7: The condensed waste gas enters the activated carbon plate, passes through the filter channel, and sequentially 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 multiple drying layers remove the moisture in the waste gas. Finally, the treated waste gas is discharged from the pipeline.

[0036] By adopting the above technical solution, it is possible to discharge waste gas during the production of polyaluminum chloride and ensure the production of polyaluminum chloride.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] 1. In the present invention, during use, the first limiting block with a staggered structure is set inside the condensation channel, which increases the residence time of the exhaust gas when it passes through the condensation device. This allows the condensation box to completely liquefy the moisture in the exhaust gas, thus preventing the exhaust gas from still containing moisture in subsequent operations, prolonging the residence time, enhancing the heat transfer effect, accelerating the liquefaction rate of water vapor and easily condensable pollutants, and improving the condensation recovery efficiency. Secondly, the activated carbon plate and the second limiting block can increase the residence time of the exhaust gas, thereby increasing the contact area between the activated carbon and odor substances, improving the adsorption rate and adsorption capacity, and improving the deodorization efficiency.

[0039] 2. In this invention, the cooled liquid can be filtered by the action of the cold water filter screen, and the filtered water can be integrated with the exhaust gas entering the main tower, thereby improving the utilization of water in liquefaction, reducing resource waste, and further improving the filtration effect of exhaust gas due to the action of the cold water filter screen.

[0040] 3.The application can reduce the temperature of the condensing box under the action of the water tank, reducing the use of 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 worked on, ensuring that the moisture in the waste gas is completely removed. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0042] Figure 1 It is a schematic diagram of the external structure of the main tower of the present application;

[0043] Figure 2 It is a schematic diagram of the connection between the dust collector and the air inlet pipe of the present application;

[0044] Figure 3 It is a schematic diagram of the internal structure of the main tower of the present application;

[0045] Figure 4 It is a schematic diagram of the sewage filter screen and U-shaped chute of the present application;

[0046] Figure 5 It is a schematic diagram of the condensing box and spherical cover of the present application;

[0047] Figure 6 It is a schematic diagram of the ring groove and connecting pipe head of the present application;

[0048] Figure 7 It is a schematic diagram of the first limiting block of the present application;

[0049] Figure 8 It is a schematic diagram of the second limiting block of the present application.

[0050] Explanation of reference signs:

[0051] 1, main tower; 101, water outlet channel; 102, through hole; 103, U-shaped chute; 104, sewage filter screen; 105, cold water filter screen;

[0052] 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;

[0053] 3, water tank; 301, ring 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;

[0054] 4, condensing box; 401, condensing channel; 402, first limiting block; 403, controller; 5, activated carbon plate; 501, filtering channel; 502, second limiting block; 503, first drying layer; 504, second drying layer; 505, third drying layer. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0056] Please refer to Figures 1 to 8 , the present application provides a technical solution:

[0057] A waste gas emission device for producing polyaluminum chloride comprises a main tower 1, wherein a dust remover 2 is fixedly installed at the top of the main tower 1, as shown in Figure 1 ; a chute opening 201 of a rectangular structure is formed at the front end of the dust remover 2, and a collection box 202 is arranged inside the dust remover 2 through the chute opening 201. In use, the collection box 202 can be pulled out and slid in, so that the dust falling inside the collection box 202 can be collected and recycled, avoiding too much dust inside the collection box 202 from affecting the dust particle separation operation inside the dust remover 2, and avoiding too much dust from accumulating inside the collection box 202, as shown in Figure 2 .

[0058] The left and right sides of the dust remover 2 are fixedly installed in a staggered manner with air inlet pipes 203, the top of each air inlet pipe 203 is fixedly installed with a fan 204, and a three-way pipe 205 is fixedly installed at the upper end of the two fans 204. The top of the three-way pipe 205 is used to be fixedly connected with the waste pipe of the reaction kettle, so that the generated waste gas can enter the inside of the dust remover 2. In use, in order to ensure that there is enough centrifugal force to separate the dust particles in the waste gas, the fan 204 is used to enter the inside of the dust remover 2 in a spiral rotating manner, so as to realize the separation of the waste gas and the dust particles under high-speed rotation, and ensure the flow rate of the waste gas, as shown in Figure 2 .

[0059] A vertical gas outlet pipe 206 is fixedly installed at the center of the upper end face of the dust collector 2, and the lower end of the gas outlet pipe 206 allows the waste gas after dust separation to enter during operation. A symmetrical connecting pipe 207 is fixedly installed at the top of the gas outlet pipe 206, so that the waste gas can be divided and operated, as shown in Figure 2 .

[0060] The lower end of the connecting pipe 207 is fixedly installed on the lower end side of the main tower 1, so that the waste gas passing through the connecting pipe 207 enters the interior of the main tower 1 for the next process, as shown in Figure 3 .

[0061] An L-shaped water outlet channel 101 is provided on the bottom face of the main tower 1 to the outside for discharging the liquid after subsequent spraying. A through hole 102 is provided in the left side face of the main tower 1 to the interior, and two U-shaped sliding grooves 103 are fixedly installed in the interior of the main tower 1. One end of the U-shaped sliding groove 103 is flush with the through hole 102, and the length of the through hole 102 is consistent with the length between the two U-shaped sliding grooves 103. Therefore, during use, the sewage filter screen 104 can be slidingly installed in the interior of the U-shaped sliding groove 103 through the through hole 102, thereby filtering the sprayed liquid, and the sewage filter screen 104 can be replaced under the action of the through hole 102, as shown in Figure 3 and Figure 4 .

[0062] A condensing box 4 is fixedly installed at the middle position in the interior of the main tower 1, and a controller 403 is fixedly installed on the outer side face of the main tower 1. The controller 403 is electrically connected with the condensing box 4, and the temperature of the condensing box 4 can be adjusted under the action of the controller 403, so that the condensing box 4 can liquefy the waste gas under subsequent action. A water tank 3 is fixedly installed in the interior of the condensing box 4, and the interior of the water tank 3 is filled with liquid that is mixed with the waste gas for fusion of the chemical substances in the waste gas. It should be noted that the water tank 3 needs to be connected with the external pipeline to ensure that the liquid in the water tank 3 is sufficient, so that the water tank 3 will not be short of liquid, and the specific connection can be set according to the actual situation, as shown in Figure 5 .

[0063] A ring groove 301 is provided in the lower end interior of the water tank 3, and a connecting pipe head 302 is rotatably installed in the interior of the ring groove 301. The lower end of the connecting pipe head 302 extends to the lower end outside of the water tank 3, and a water pump 303 is fixedly installed at the lower end, as shown in Figure 6 .

[0064] The lower end of the water pump 303 is fixedly installed with a conveying pipe 311, and the lower end of the conveying pipe 311 is fixedly installed with a plurality of water spraying pipes 305 arranged in a circular array; secondly, a spherical cover 306 is fixedly installed inside the main tower 1 below the water spraying pipes 305, the spherical cover 306 is a semicircular structure with a hollow structure inside, and a plurality of air inlet holes 307 are uniformly arranged in a circular array from the outer side to the inner side, as shown in Figure 5

[0065] Therefore, in use, the exhaust gas entering the inside of the main tower 1 will enter the inside of the spherical cover 306 due to upward movement, and then pass through the air inlet holes 307. At this time, the water pump 303 is started, which can extract the liquid in the water tank 3 under the action of the connecting pipe head 302, and then deliver it to the inside of the conveying pipe 311, and finally sprayed through the water spraying holes on the water spraying pipes 305, so as to perform the spraying operation on the floating exhaust gas.

[0066] In order to avoid liquid accumulation on the outer side of the spherical cover 306 during spraying, a drain hole 308 is arranged at the lower corner of the spherical cover 306, through which the sprayed liquid can pass and then fall onto the surface of the sewage filter screen 104 for filtering operation.

[0067] Secondly, the circumferential surface of the conveying pipe 311 is fixedly installed with a secondary bevel gear 304, and two symmetrical servo motors 309 are fixedly installed on the outer side of the main tower 1. The output shaft of the servo motor 309 is fixedly installed with a primary bevel gear 310 inside the main tower 1. The primary bevel gear 310 and the secondary bevel gear 304 are in meshing state. The output shaft of the servo motor 309 will rotate with the primary bevel gear 310 when the servo motor 309 is started. The primary bevel gear 310 will drive the secondary bevel gear 304 to rotate during rotation, which can drive the conveying pipe 311 to rotate synchronously. The conveying pipe 311 will drive the water spraying pipes 305 and the water pump 303 to rotate synchronously, and the water pump 303 will drive the connecting pipe head 302 to rotate. In this way, the water spraying pipes 305 can rotate in the inside of the main tower 1, so as to avoid the situation that the water spraying pipes 305 are not in place for a long time.

[0068] ​Secondly, the lower end of the delivery pipe 311 passes through the cold water filter screen 105, which is in a rotating connection state, so that the cold water filter screen 105 does not affect the rotation of the delivery pipe 311. As the exhaust gas moves upward, it enters the inside of the condensing box 4 and then enters the inside of the condensing channel 401. Due to the restriction of the first limiting block 402 inside the condensing channel 401, the exhaust gas stays in the condensing channel 401 for a long time. Therefore, in use, the water molecules in the exhaust gas are gradually liquefied under the action of the condensing channel 401. The liquefied water molecules fall to the surface of the cold water filter screen 105 and are filtered by the cold water filter screen 105. The filtered water molecules are combined with the newly entering exhaust gas to achieve the use of water, as shown in Figure 5

[0069] The condensed exhaust gas continues to move upward. The active carbon plate 5 is fixedly installed at the upper end of the main tower 1 above the condensing box 4. The filter channel 501 is uniformly formed on the upper end surface to the lower end surface of the active carbon plate 5. The second limiting block 502 is fixedly installed in the filter channel 501 in a staggered state. Therefore, in use, due to the action of the second limiting block 502, the exhaust gas stays in the active carbon plate 5 for a long time, so that there is sufficient time to adsorb the substances in the exhaust gas, thereby completing the filtering of the exhaust gas.

[0070] Then, the first drying layer 503, the second drying layer 504, and the third drying layer 505 are sequentially fixedly installed at the upper end of the main tower 1 above the active carbon plate 5. The adsorbed exhaust gas passes through the first drying layer 503, the second drying layer 504, and the third drying layer 505 in sequence. The exhaust gas is dried by the first drying layer 503, the second drying layer 504, and the third drying layer 505. After the exhaust gas passes through the third drying layer 505, it is discharged through the pipe on both sides of the upper end of the main tower 1. The above structures cooperate to complete the exhaust gas discharge purification operation, avoiding the pollution of the exhaust gas to the air, as shown in Figure 8 Figure 1

[0071] Secondly, in the production of polyaluminum chloride, the exhaust gas will affect the production. Therefore, in use, the exhaust gas needs to be treated. The generated exhaust gas is filtered in the inside of the main tower 1. The specific steps are as follows:

[0072] ​​​S1: Pulverize industrial aluminum hydroxide and calcium aluminate to meet production requirements, and prepare 31% hydrochloric acid as a reaction raw material.

[0073] S2: The pulverized raw materials and hydrochloric acid are added to the reaction vessel in a certain proportion. The stirring device is turned on, and the reaction is carried out at 95°C for 4 hours. During the reaction, waste gas containing dust particles and hydrogen chloride will be generated.

[0074] The product is pumped into a filter press for filtration. The filtrate is then matured and its basicity adjusted before being heated with steam and dried into a solid. The solid is in the form of flakes or powder, packaged, and then stored in the warehouse.

[0075] 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. Subsequently, the waste gas enters the dust collector 2. In the dust collector, centrifugal force is used to separate the dust particles in the waste gas. The separated waste gas enters the main tower 1 through the air outlet pipe 206.

[0076] 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 delivery pipe 311 and sprays it out through the spray pipe 305. The sodium hydroxide solution reacts with the acidic gas in the exhaust gas to reduce the acidity of the exhaust gas.

[0077] S5: Start the servo motor 309, whose output shaft drives the main bevel gear 310 to rotate. The main bevel gear 310 drives the secondary bevel gear 304 to rotate, which in turn drives the conveying pipe 311 to rotate, allowing the sodium hydroxide solution sprayed from the water spray pipe 305 to react more evenly with the exhaust gas.

[0078] S6: After acid-base neutralization treatment, the exhaust gas passes through the cold water filter 105 and enters the condensation box 4. Inside the condensation box 4, the exhaust gas comes into contact with the first limiting block 402 in the condensation channel 401. Through condensation, the water vapor and other condensable components in the exhaust gas are condensed, further purifying the exhaust gas.

[0079] S7: The condensed waste gas enters the activated carbon plate 5, passes through the filter channel 501, and sequentially 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 multiple drying layers remove the moisture in the waste gas. Finally, the treated waste gas is discharged from the pipeline.

[0080] Working principle: First, the exhaust gas enters the interior of the three-way pipe 205 under the action of the fan 204, then enters the interior of the air inlet pipe 203, and finally enters the interior of the dust collector 2. Under the action of centrifugal force, the dust particles in the exhaust gas are removed.

[0081] The exhaust gas passes through the outlet pipe 206 into the inside of the connecting pipe 207, and then into the inside of the main tower 1.

[0082] The exhaust gas passes through the spherical cover 306, passes through the cold water filter screen 105, and enters the inside of the condensing box 4. The water pump 303 is started, and under the action of the connecting pipe head 302, the water pump 303 draws the liquid in the inside of the water tank 3 to the inside of the conveying pipe 311, and finally sprays out through the water spraying pipe 305 to perform the spraying operation on the exhaust gas.

[0083] After the spraying, the sewage passes through the drain hole 308, falls onto the sewage filter screen 104, and is finally discharged through the water outlet channel 101.

[0084] The exhaust gas is liquefied under the action of the condensing box 4, the condensing channel 401, and the first limiting block 402, and the liquefied solution falls onto the cold water filter screen 105, which performs the operation on it.

[0085] The exhaust gas passes through the condensing channel 401 into the filtering channel 501 of the activated carbon plate 5, adsorbs the impurities in the exhaust gas under the action of the second limiting block 502, and then passes through the first drying layer 503, the second drying layer 504, and the third drying layer 505 one by one, and is finally discharged.

[0086] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A waste gas emission device for producing polyaluminum chloride, comprising a main tower (1), characterized in that: The inside of the main tower (1) is fixedly installed with a condensing box (4), and the inside of the condensing box (4) is fixedly installed with a water tank (3); The upper end surface to the lower end surface of the condensing box (4) is provided with a condensing channel (401), and the inside of the condensing channel (401) is fixedly installed with a first limiting block (402) in a staggered manner; The lower part of the water tank (3) is provided with a water pump (303), the lower end of the water pump (303) is fixedly installed with a conveying pipe (311), and the lower end of the conveying pipe (311) is fixedly installed with a water spraying pipe (305) in an annular array; The inside of the main tower (1) is fixedly installed with a spherical cover (306) below the water spraying pipe (305), and the outside to the inside of the spherical cover (306) is uniformly provided with an air inlet hole (307) in an annular array; The inside of the main tower (1) is provided with a water outlet channel (101) from the lower end surface to the outside, the lower end outside of the main tower (1) is provided with a through hole (102) to the inside, the inside of the main tower (1) is fixedly installed with a U-shaped sliding groove (103), one end of the U-shaped sliding groove (103) is flush with the through hole (102), and the inside of the U-shaped sliding groove (103) is slidably installed with a sewage filter screen (104); The inside of the main tower (1) is fixedly installed with an activated carbon plate (5) above the condensing box (4), and the upper end surface to the lower end surface of the activated carbon plate (5) is uniformly provided with a filter channel (501), and the inside of the filter channel (501) is fixedly installed with a second limiting block (502) in a staggered manner.

2. The apparatus for exhausting waste gas produced in the production of polyaluminum chloride according to claim 1, characterized in that: The lower end of the water tank (3) is provided with an annular groove (301) in the inside, and the upper end of the water pump (303) is fixedly installed with a connecting pipe head (302), and the connecting pipe head (302) is rotatably installed in the inside of the annular groove (301).

3. The apparatus for exhausting waste gas produced in the production of polyaluminum chloride according to claim 1, characterized in that: The outside of the main tower (1) is fixedly installed with a servo motor (309), the output shaft of the servo motor (309) is fixedly installed with a main conical gear (310) in the inside of the main tower (1), the circumferential surface of the conveying pipe (311) is fixedly installed with a secondary conical gear (304), and the secondary conical gear (304) and the main conical gear (310) are engaged.

4. The apparatus for exhausting waste gas produced in the production of polyaluminum chloride according to claim 1, characterized in that: The inside of the main tower (1) is fixedly installed with a cold water filter screen (105), the lower end of the conveying pipe (311) passes through the cold water filter screen (105), and the lower end corners of the spherical cover (306) are provided with through water holes (308).

5. The apparatus for exhausting waste gas produced in the production of polyaluminum chloride according to claim 1, characterized in that: The inside of the main tower (1) is fixedly installed with a first drying layer (503), a second drying layer (504) and a third drying layer (505) in order from top to bottom above the activated carbon plate (5), the pore diameters of the first drying layer (503), the second drying layer (504) and the third drying layer (505) are inconsistent and decrease in order from top to bottom.

6. The apparatus for venting off exhaust gas in the production of polyaluminum chloride according to claim 1, characterized in that: The outside of the main tower (1) is fixedly installed with a controller (403), the upper end of the main tower (1) is fixedly installed with a dust remover (2), one side of the lower end of the dust remover (2) is provided with a sliding groove (201), and the inside of the sliding groove (201) is slidably installed with a collection box (202).

7. The exhaust gas emission device for producing polyaluminum chloride according to claim 6, characterized in that: The air inlet pipe (203) is fixedly installed on the both sides of the dust remover (2) in staggered mode, the fan (204) is fixedly installed above the air inlet pipe (203), the three-way pipe (205) is fixedly installed above the fan (204), the air outlet pipe (206) is fixedly installed from the upper end surface to the interior of the dust remover (2), the connecting pipe (207) is fixedly installed on the upper end of the air outlet pipe (206), and the lower end of the connecting pipe (207) is fixedly connected with the main tower (1) and penetrates through the main tower (1).

8. A production preparation method of producing polyaluminum chloride, the exhaust emission device of producing polyaluminum chloride as claimed in any one of claims 1-7, characterized in that: The method comprises the following steps: S1: The industrial aluminum hydroxide and calcium aluminate are crushed to meet the production requirements, and 31% hydrochloric acid is prepared as a reaction raw material; S2: The crushed raw materials and hydrochloric acid are put into a reaction kettle in proportion, a stirring device is started, and 95℃ reaction is carried out for 4 hours. In the reaction process, waste gas containing dust particles and hydrogen chloride components is generated. The product is pumped into a filter press for pressure filtration. The obtained filtrate is matured and adjusted in base degree, and then is subjected to steam heating to be dried into a solid. The solid is in flaky or powdery form, and the finished product is stored after packaging; S3: The fan (204) is started, the waste gas generated in the reaction is introduced into the three-way pipe (205), and then into the air inlet pipe (203). Subsequently, the waste gas enters the dust remover (2). In the dust remover, 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) delivers the sodium hydroxide solution in the water tank (3) to the conveying pipe (311), and sprays it out through the water spraying pipe (305). The sodium hydroxide solution reacts with the acidic gas in the waste gas to reduce the acidity of the waste gas; S5: The servo motor (309) is started, the output shaft drives the main bevel gear (310) to rotate, the main bevel gear (310) drives the auxiliary bevel gear (304) to rotate, and the auxiliary bevel gear (304) drives the conveying pipe (311) to rotate, so that the sodium hydroxide solution sprayed by the water spraying pipe (305) can more uniformly contact and react with the waste gas; S6: The waste gas after acid-base neutralization treatment passes through the cold water filter screen (105) and enters the condensing box (4). In the condensing box (4), the waste gas contacts the first limiting block (402) in the condensing channel (401). Through condensation, the water vapor in the waste gas can be condensed, and the waste gas is further purified; S7: The condensed waste gas enters the activated carbon plate (5), passes through the filtering channel (501), and sequentially 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.

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