A sulfuric acid dropping device for the production of polyaluminum sulfate

Abstract

The present invention relates to the technical field of polyaluminum sulfate production, and discloses a sulfuric acid dropping device for polyaluminum sulfate production, which includes a sulfuric acid tank and a cover plate connected to the sulfuric acid tank. A heat exchange sleeve is installed inside the sulfuric acid tank. A plurality of support feet arranged at equal intervals are fixedly connected to the bottom of the heat exchange sleeve. The bottom of the support feet is detachably connected to the bottom surface of the inner wall of the sulfuric acid tank. A heat exchange groove is formed inside the heat exchange sleeve. A liquid inlet pipe communicating with the heat exchange groove is fixedly connected to one side of the top of the heat exchange sleeve. A liquid outlet pipe communicating with the heat exchange groove is fixedly connected to one side of the bottom of the heat exchange sleeve. A heater is fixedly connected to the outer wall of the sulfuric acid tank. For this sulfuric acid dropping device for polyaluminum sulfate production, through the mutual cooperation of the heat exchange sleeve and the heater, the device can realize the on-line heating of sulfuric acid, ensure that the sulfuric acid dropped into the reaction kettle has a certain temperature, reduce the influence of low-temperature sulfuric acid on the temperature of the reaction system, and improve the reaction rate and efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of polyaluminum sulfate production, and specifically to a sulfuric acid dropping device for polyaluminum sulfate production. Background Art

[0002] Polyaluminum sulfate is an important inorganic polymer flocculant, widely used in the field of water treatment. It is a mixture composed of a series of polymerized aluminum ions, having better flocculation effect and a wider pH application range than traditional aluminum sulfate. In the preparation process of polyaluminum sulfate, sulfuric acid plays a crucial role. It is not only one of the reactants, participating in the reaction of aluminum salts to form polyaluminum sulfate, but also affects the degree of polymerization and molecular weight of the product. The addition amount, concentration, and addition method of sulfuric acid will all affect the performance of the final product.

[0003] During the production process of polyaluminum sulfate, it is necessary to first add an aluminum sulfate solution into a reaction kettle, and then slowly drop sulfuric acid into the aluminum sulfate solution through a dropping device while controlling the temperature and pH value in the reaction kettle, so as to obtain polyaluminum sulfate through the reaction. After the reaction is completed, it is necessary to carry out aging treatment to make the structure of polyaluminum sulfate more stable. After aging, the polyaluminum sulfate solution is filtered, washed, and dried to obtain the final polyaluminum sulfate product.

[0004] As in the prior art, the patent with the patent authorization announcement number CN218689280U discloses a sulfuric acid dropping device for polyaluminum sulfate production, including a low-position sulfuric acid dropping device body installed on one side of a polyaluminum sulfate reaction kettle, and the low-position sulfuric acid dropping device body includes a sulfuric acid tank. The above device can automatically pump and drop and measure the dropping amount according to actual needs through the cooperation of a diaphragm metering pump and a PCL controller, with a high degree of automation. And through the automatic metering and dropping method, it reduces the phenomenon of unstable rate change affected by siphon and the like, and the dropping rate is stable. By setting the sulfuric acid tank at a low position for pumping and dropping, it reduces the phenomenon of high-position overflow of sulfuric acid and improves safety. Through the setting of a counterweight floating component, a lower touch switch, and an alarm indication component, it can automatically alarm and remind personnel to add in time when the sulfuric acid is about to run out and the liquid level is low, and through the setting of a lifting adjustment component, it can adjust the alarm liquid level height according to actual needs.

[0005] However, the above sulfuric acid dropping device still has certain defects when in use; since sulfuric acid is stored in the sulfuric acid tank before dropping, the sulfuric acid tank cannot heat the sulfuric acid, which will cause the sulfuric acid to be dropped at a relatively low temperature. When this low-temperature sulfuric acid is dropped into the aluminum sulfate solution, it will not only reduce the temperature of the reaction system, affect the reaction rate and efficiency, but also may cause uneven reaction due to temperature difference, thereby affecting the degree of polymerization and molecular weight distribution of polyaluminum sulfate, and ultimately affecting the quality and performance of the product. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a sulfuric acid dropping device for the production of polyaluminum sulfate, which can preheat the sulfuric acid in the device.

[0007] To achieve the above object, the present invention provides the following technical solution: A sulfuric acid dropping device for the production of polyaluminum sulfate, including a sulfuric acid tank and a cover plate connected to the sulfuric acid tank. A heat exchange sleeve is installed in the sulfuric acid tank. The bottom of the heat exchange sleeve is fixedly connected with a plurality of support feet arranged at equal intervals. The bottom of the support feet is detachably connected to the bottom surface of the inner wall of the sulfuric acid tank. A heat exchange groove is opened in the heat exchange sleeve. One side of the top of the heat exchange sleeve is fixedly connected with a liquid inlet pipe communicating with the heat exchange groove. One side of the bottom of the heat exchange sleeve is fixedly connected with a liquid outlet pipe communicating with the heat exchange groove. Both the liquid inlet pipe and the liquid outlet pipe penetrate through the side wall of the sulfuric acid tank. A heater is fixedly connected to the outer wall of the sulfuric acid tank. One ends of the liquid inlet pipe and the liquid outlet pipe located outside the sulfuric acid tank are both fixedly connected to the heater. A cleaning component is connected to the top of the heat exchange sleeve, and a moisture absorption component is connected to the bottom surface of the cover plate.

[0008] Further, the cleaning component includes a fixing ring, a connecting ring, a spray head, a connecting pipe and a liquid inlet head. The top of the heat exchange sleeve is fixedly connected with a fixing ring. The top of the fixing ring is fixedly connected with a connecting ring. A plurality of spray heads are fixedly connected to both the inner side and the outer side of the connecting ring. A diversion groove is opened in the connecting ring. The spray head is communicated with the diversion groove. A connecting groove communicated with the diversion groove is opened in the fixing ring. The top of the inner wall of the heat exchange groove is fixedly connected with a connecting pipe communicated with the connecting groove. One end of the connecting pipe passes through the side wall of the sulfuric acid tank along the liquid inlet pipe and penetrates through the outer wall of the liquid inlet pipe near the heater. The end of the connecting pipe located outside the sulfuric acid tank is fixedly connected with a liquid inlet head. A sealing plug is detachably connected in the liquid inlet head. A drain pipe is fixedly connected to the bottom of the sulfuric acid tank.

[0009] Further, the moisture absorption component includes an adsorption pipe, an adsorption block, an external thread ring and an internal thread ring. The adsorption pipe is connected to the bottom surface of the cover plate. A plurality of air guide holes are opened on the outer wall of the adsorption pipe. The top of the adsorption pipe is fixedly connected with an external thread ring. The external thread ring is threadedly connected with an internal thread ring on the outer wall. The adsorption block is located between the adsorption pipe, the external thread ring and the internal thread ring.

[0010] Further, a sliding groove corresponding to the position of the adsorption pipe is opened on the surface of the cover plate. The bottom of the adsorption pipe is fixedly connected with a bottom plate. The top of the internal thread ring is fixedly connected with a top plate. The cross-sections of both the bottom plate and the top plate are larger than that of the adsorption pipe.

[0011] Further, two symmetrically arranged lower magnetic blocks are fixedly connected inside the bottom plate. Two symmetrically arranged installation grooves are opened inside the cover plate. A magnetic attraction block is fixedly connected in each installation groove. The magnetic attraction block corresponds to the position of the lower magnetic block.

[0012] Further, two symmetrically arranged positioning columns are fixedly connected to the surface of the bottom plate. Positioning grooves corresponding to the positions of the positioning columns are opened on the bottom surface of the cover plate.

[0013] Furthermore, two symmetrically arranged upper magnetic blocks are fixedly connected inside the top plate, and the positions of the upper magnetic blocks correspond to those of the magnetic attraction blocks.

[0014] Furthermore, a handle is fixedly connected to the surface of the top plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) For the sulfuric acid dropping device used in the production of polyaluminum sulfate, through the mutual cooperation of the heat exchange sleeve and the heater, this device can achieve on-line heating of sulfuric acid, ensure that the sulfuric acid dropped into the reaction kettle has a certain temperature, reduce the influence of low-temperature sulfuric acid on the temperature of the reaction system, and improve the reaction rate and efficiency; by controlling the temperature of the heat medium, the heating temperature of sulfuric acid can be accurately controlled, ensuring the uniformity of the reaction system, thereby controlling the degree of polymerization and molecular weight distribution of polyaluminum sulfate, and improving the product quality and performance; at the same time, the viscosity of the heated sulfuric acid is reduced, and the accuracy and uniformity of dropping are also improved, reducing the problem of inaccurate dropping amount, and improving the production stability of polyaluminum sulfate;

[0017] (2) By using multiple spray heads connected to both sides of the connecting ring, preliminary cleaning of the inside of the sulfuric acid tank can be carried out before manual cleaning by the staff, effectively removing the residual sulfuric acid, reducing the risk of the staff directly contacting high-concentration sulfuric acid, and thus improving the safety and efficiency of the cleaning process;

[0018] (3) The adsorption block can absorb the water vapor in the sulfuric acid tank through the air guide holes, reduce the humidity inside the tank, prevent the water vapor from condensing and diluting the sulfuric acid, thereby ensuring the stability of the sulfuric acid concentration and providing a reliable raw material guarantee for the subsequent production of polyaluminum sulfate;

[0019] (4) The splashing of sulfuric acid will be blocked by the bottom plate and the cover plate, thereby avoiding the corrosion of the adsorption block by sulfuric acid and causing its failure, and also avoiding the generation of impurities during the corrosion of the adsorption block to pollute the sulfuric acid, thereby ensuring the purity of the sulfuric acid and the smooth progress of the production process;

[0020] (5) Through the magnetic attraction cooperation of the magnetic attraction block and the lower magnetic block, after the staff pulls up the top plate, there is no need to continuously apply force to maintain the fitting state of the bottom plate and the cover plate, and the magnetic attraction force can stably maintain the fitting between the two, enabling the staff to release the top plate and add sulfuric acid more freely with both hands, improving the convenience and efficiency of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structure schematic diagram of the whole of the present invention;

[0022] Figure 2 It is a three-dimensional sectional structure schematic diagram of the whole of the present invention;

[0023] Figure 3 Schematic three-dimensional sectional structure diagram of the heat exchange sleeve, heater and connecting ring of the present invention;

[0024] Figure 4 is Figure 3 Enlarged three-dimensional sectional structure diagram at position A above;

[0025] Figure 5 Schematic three-dimensional sectional structure diagram of the cover plate and moisture absorption component of the present invention;

[0026] Figure 6 Schematic three-dimensional disassembled sectional structure diagram of the moisture absorption component of the present invention;

[0027] Figure 7 Schematic three-dimensional disassembled structure diagram of the connecting pipe, adsorption block and internal thread ring of the present invention;

[0028] Figure 8 Schematic three-dimensional disassembled sectional structure diagram of the connecting pipe, internal thread ring and external thread ring of the present invention.

[0029] In the figure: 1, sulfuric acid tank; 2, cover plate; 3, heat exchange sleeve; 4, support feet; 5, heat exchange tank; 6, liquid inlet pipe; 7, liquid outlet pipe; 8, heater; 9, fixing ring; 10, connecting ring; 11, diversion groove; 12, spray head; 13, connecting groove; 14, connecting pipe; 15, liquid inlet head; 16, adsorption pipe; 17, air guide hole; 18, adsorption block; 19, external thread ring; 20, internal thread ring; 21, sliding groove; 22, bottom plate; 23, top plate; 24, handle; 25, positioning column; 26, positioning groove; 27, installation groove; 28, magnetic attraction block; 29, upper magnetic block; 30, lower magnetic block; 31, drain pipe; 32, sealing plug. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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.

[0031] Please refer to Figures 1 to 8, A sulfuric acid dropping device for the production of polyaluminum sulfate, comprising a sulfuric acid tank 1 and a cover plate 2 connected to the sulfuric acid tank 1. An exchange heat sleeve 3 is installed in the sulfuric acid tank 1. A plurality of support feet 4 arranged at equal intervals are fixedly connected to the bottom of the exchange heat sleeve 3. The bottom of the support feet 4 is detachably connected to the bottom surface of the inner wall of the sulfuric acid tank 1. An exchange heat groove 5 is formed in the exchange heat sleeve 3. A liquid inlet pipe 6 communicating with the exchange heat groove 5 is fixedly connected to one side of the top of the exchange heat sleeve 3. A liquid outlet pipe 7 communicating with the exchange heat groove 5 is fixedly connected to one side of the bottom of the exchange heat sleeve 3. Both the liquid inlet pipe 6 and the liquid outlet pipe 7 penetrate the side wall of the sulfuric acid tank 1. A heater 8 is fixedly connected to the outer wall of the sulfuric acid tank 1. One ends of the liquid inlet pipe 6 and the liquid outlet pipe 7 located outside the sulfuric acid tank 1 are both fixedly connected to the heater 8. A cleaning assembly is connected to the top of the exchange heat sleeve 3, and a moisture absorption assembly is connected to the bottom surface of the cover plate 2.

[0032] When the sulfuric acid dropping device for the production of polyaluminum sulfate in the present invention is in use, first inject sulfuric acid into the sulfuric acid tank 1. The sulfuric acid contacts the exchange heat sleeve 3 in the sulfuric acid tank 1. Subsequently, the heater 8 heats the heat medium (such as hot water or hot oil) in the liquid inlet pipe 6, the liquid outlet pipe 7 and the exchange heat sleeve 3. The heat medium circulates in the exchange heat groove 5 and transfers heat to the sulfuric acid contacting the exchange heat sleeve 3 to achieve the heating of the sulfuric acid. The heated sulfuric acid is dropped into the reaction kettle through a diaphragm metering pump connected to one side of the sulfuric acid tank 1 for reaction.

[0033] Through the mutual cooperation of the exchange heat sleeve 3 and the heater 8, the device can realize the on-line heating of sulfuric acid, ensure that the sulfuric acid dropped into the reaction kettle has a certain temperature, reduce the influence of low-temperature sulfuric acid on the temperature of the reaction system, and improve the reaction rate and efficiency; by controlling the temperature of the heat medium, the heating temperature of sulfuric acid can be accurately controlled, the uniformity of the reaction system can be ensured, so as to control the degree of polymerization and molecular weight distribution of polyaluminum sulfate, and improve the product quality and performance; at the same time, the viscosity of the heated sulfuric acid is reduced, and the accuracy and uniformity of dropping are also improved, reducing the problem of inaccurate dropping amount and improving the production stability of polyaluminum sulfate.

[0034] As a preferred technical solution of the present invention, the cleaning component includes a fixing ring 9, a connecting ring 10, a spray head 12, a connecting pipe 14 and a liquid inlet head 15. The top of the heat exchange sleeve 3 is fixedly connected with a fixing ring 9, the top of the fixing ring 9 is fixedly connected with a connecting ring 10, and a plurality of spray heads 12 are fixedly connected to both the inner and outer sides of the connecting ring 10. A diversion groove 11 is formed in the connecting ring 10, and the spray head 12 is communicated with the diversion groove 11. A connecting groove 13 communicated with the diversion groove 11 is formed in the fixing ring 9. The top of the inner wall of the heat exchange groove 5 is fixedly connected with a connecting pipe 14 communicated with the connecting groove 13. One end of the connecting pipe 14 passes through the side wall of the sulfuric acid tank 1 along the liquid inlet pipe 6 and penetrates through the outer wall of the liquid inlet pipe 6 near one end of the heater 8. One end of the connecting pipe 14 located outside the sulfuric acid tank 1 is fixedly connected with a liquid inlet head 15. A sealing plug 32 is detachably connected in the liquid inlet head 15. The bottom of the sulfuric acid tank 1 is fixedly connected with a drain pipe 31.

[0035] Specifically, when it is necessary to clean the inside of the sulfuric acid tank 1 after production, first remove the sealing plug 32 from the liquid inlet head 15, and then connect a high-pressure water source such as a high-pressure water gun to the liquid inlet head 15. At this time, the high-pressure water flow will enter the diversion groove 11 through the connecting pipe 14 and the connecting groove 13, and then be ejected through the spray heads 12 on both sides of the connecting ring 10 to clean the inside of the sulfuric acid tank 1 and the inner and outer surfaces of the heat exchange sleeve 3. The sulfuric acid residues attached to the inside of the sulfuric acid tank 1 and the heat exchange sleeve 3 are removed by the water flow. The waste liquid after cleaning will flow out through the drain pipe 31 for subsequent recovery and discharge. At this time, the primary cleaning is completed. Subsequently, the staff wears gloves and directly flushes the inside of the sulfuric acid tank 1 with a high-pressure water gun to complete the secondary cleaning. After the cleaning is completed, seal the liquid inlet head 15 again to complete the cleaning process and wait for the next reaction work; by using a plurality of spray heads 12 connected to both sides of the connecting ring 10, the inside of the sulfuric acid tank 1 can be preliminarily cleaned before the staff manually cleans, effectively removing the residual sulfuric acid, reducing the risk of the staff directly contacting high-concentration sulfuric acid, and thus improving the safety and efficiency of the cleaning process.

[0036] As a preferred technical solution of the present invention, the moisture absorption component includes an adsorption pipe 16, an adsorption block 18, an external thread ring 19 and an internal thread ring 20. The bottom surface of the cover plate 2 is connected with an adsorption pipe 16. A plurality of air guide holes 17 are formed in the outer wall of the adsorption pipe 16. The top of the adsorption pipe 16 is fixedly connected with an external thread ring 19, and the external thread ring 19 is threadedly connected with an internal thread ring 20. The adsorption block 18 is located between the adsorption pipe 16, the external thread ring 19 and the internal thread ring 20.

[0037] Specifically, the adsorption block 18 is filled with hygroscopic materials (such as silica gel, molecular sieve, etc.), which can effectively absorb water vapor; the adsorption block 18 can absorb water vapor in the sulfuric acid tank 1 through the air guide hole 17, reduce the humidity in the tank, prevent water vapor condensation and dilute sulfuric acid, thereby ensuring the stability of sulfuric acid concentration, and providing reliable raw material guarantee for subsequent polyaluminum sulfate production; when the adsorption block 18 is saturated with water, the adsorption block 18 can be taken out by unscrewing the internal threaded ring 20, and it can be replaced or regenerated.

[0038] As a preferred technical solution of the present invention, a sliding groove 21 corresponding to the position of the adsorption tube 16 is opened on the surface of the cover plate 2, the bottom of the adsorption tube 16 is fixedly connected to a bottom plate 22, and the top of the internal threaded ring 20 is fixedly connected to a top plate 23, and the cross-sections of the bottom plate 22 and the top plate 23 are both larger than the adsorption tube 16.

[0039] Specifically, when adding sulfuric acid into the sulfuric acid tank 1, the sulfuric acid may splash after entering the sulfuric acid tank 1, causing the sulfuric acid to contact the adsorption block 18 through the air guide hole 17 and corrode the adsorption block 18. In order to avoid this situation, when adding sulfuric acid, the staff can pull up the top plate 23 by hand, and then pull the internal thread ring 20, the external thread ring 19 and the adsorption tube 16 until the bottom plate 22 is in contact with the bottom surface of the cover plate 2. Then the staff can add sulfuric acid to the sulfuric acid tank 1. At this time, the sulfuric acid will be blocked by the bottom plate 22 and the cover plate 2 after splashing, thereby avoiding sulfuric acid from corroding the adsorption block 18 and causing it to fail, and also avoiding impurities generated during the corrosion of the adsorption block 18 to contaminate the sulfuric acid, thereby ensuring the purity of the sulfuric acid and the smooth progress of the production process.

[0040] As a preferred technical solution of the present invention, two symmetrically arranged lower magnetic blocks 30 are fixedly connected inside the bottom plate 22, and two symmetrically arranged mounting grooves 27 are provided inside the cover plate 2. A magnetic attraction block 28 is fixedly connected inside each mounting groove 27, and the magnetic attraction block 28 corresponds to the position of the lower magnetic block 30.

[0041] Specifically, after the staff pulls up the top plate 23, the magnetic block 28 will absorb the lower magnetic block 30, so that the bottom plate 22 and the bottom surface of the cover plate 2 are stably attached together. At this time, the staff can loosen the top plate 23 and use both hands to add sulfuric acid without holding the top plate 23 by hand. After the sulfuric acid is added, the staff pushes the top plate 23 again by hand to separate the lower magnetic block 30 from the magnetic block 28. The bottom plate 22 will automatically return to the sliding groove 21 under the action of gravity, and the adsorption component will resume normal working state without additional operation steps.

[0042] By designing the magnetic attraction cooperation between the magnetic attraction block 28 and the lower magnetic block 30, after the staff pulls up the top plate 23, there is no need to continuously apply force to maintain the fitting state between the bottom plate 22 and the cover plate 2. The magnetic attraction force can stably maintain the fitting between the two, enabling the staff to release the top plate 23 and use both hands to add sulfuric acid more freely, improving the convenience and efficiency of the operation.

[0043] As a preferred technical solution of the present invention, two symmetrically arranged positioning columns 25 are fixedly connected to the surface of the bottom plate 22, and positioning grooves 26 corresponding to the positions of the positioning columns 25 are opened on the bottom surface of the cover plate 2.

[0044] Specifically, when the staff replaces the adsorption block 18, first pull up the adsorption assembly through the top plate 23. At this time, the positioning column 25 will be inserted into the positioning groove 26. After the bottom plate 22 and the bottom surface of the cover plate 2 are adsorbed, the staff can turn the top plate 23 to separate the internal thread ring 20 from the external thread ring 19. Then, the adsorption block 18 can be taken out. Then, a new adsorption block 18 is placed into the adsorption tube 16, the internal thread ring 20 and the external thread ring 19 are tightened again, and then the top plate 23 is gently pressed down to separate the bottom plate 22 from the magnetic attraction block 28, and the positioning column 25 is disengaged from the positioning groove 26, and the adsorption assembly can return to the normal working state. By using the cooperation of the positioning column 25 and the positioning groove 26, it can be ensured that when the top plate 23 and the internal thread ring 20 are turned, the bottom plate 22 and the external thread ring 19 will not rotate therewith, ensuring the stability and accuracy of the operation and facilitating the replacement of the adsorption block 18.

[0045] As a preferred technical solution of the present invention, two symmetrically arranged upper magnetic blocks 29 are fixedly connected inside the top plate 23, and the upper magnetic blocks 29 correspond to the positions of the magnetic attraction blocks 28.

[0046] Specifically, during normal use, the top plate 23 will be in contact with the surface of the cover plate 2. At this time, the upper magnetic blocks 29 and the magnetic attraction blocks 28 will be adsorbed together, thereby providing fixation for the entire adsorption assembly, helping to reduce the shaking of the adsorption assembly caused by vibration or improper operation, and ensuring the normal working state of the adsorption assembly.

[0047] As a preferred technical solution of the present invention, a handle 24 is fixedly connected to the surface of the top plate 23.

[0048] Specifically, the setting of the handle 24 facilitates the staff to grasp the top plate 23, making the operations of pulling up, pushing back, and rotating the top plate 23 easier and more labor-saving. The surface of the handle 24 is made of anti-slip material, which can further improve the safety of the operation and prevent operation errors caused by hand slipping. Through the handle 24, the staff can more conveniently control the top plate 23, and both the lifting and resetting of the adsorption assembly can be completed more smoothly and accurately.

[0049] It should be noted that the structures inside the equipment for dripping sulfuric acid used in the production of the above-mentioned polyaluminum sulfate are all made of corrosion-resistant materials to ensure the long-term stable operation of the equipment in a strong acid environment, prevent the equipment from being damaged due to corrosion, and improve the service life and reliability of the equipment.

[0050] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sulfuric acid dripping device for producing polyaluminium sulfate, comprising a sulfuric acid tank (1) and a cover plate (2) connected to the sulfuric acid tank (1), characterized in that: A heat exchange jacket (3) is installed in the sulfuric acid tank (1). The bottom of the heat exchange jacket (3) is fixedly connected to a plurality of equidistantly arranged support legs (4). The bottom of the support legs (4) is detachably connected to the bottom surface of the inner wall of the sulfuric acid tank (1). A heat exchange groove (5) is provided in the heat exchange jacket (3). A liquid inlet pipe (6) connected to the heat exchange groove (5) is fixedly connected to one side of the top of the heat exchange jacket (3). A liquid outlet pipe (7) connected to the heat exchange groove (5) is fixedly connected to one side of the bottom of the heat exchange jacket (3). Both the liquid inlet pipe (6) and the liquid outlet pipe (7) penetrate the side wall of the sulfuric acid tank (1). A heater (8) is fixedly connected to the outer wall of the sulfuric acid tank (1). Both ends of the liquid inlet pipe (6) and the liquid outlet pipe (7) located outside the sulfuric acid tank (1) are fixedly connected to the heater (8). A cleaning component is connected to the top of the heat exchange jacket (3). A moisture absorption component is connected to the bottom surface of the cover plate (2). The moisture absorption component comprises an adsorption tube (16), an adsorption block (18), an external threaded ring (19) and an internal threaded ring (20); the bottom surface of the cover plate (2) is connected to the adsorption tube (16); the outer wall of the adsorption tube (16) is provided with a plurality of air guide holes (17); the top of the adsorption tube (16) is fixedly connected to the external threaded ring (19); the outer wall of the external threaded ring (19) is threadedly connected to the internal threaded ring (20); and the adsorption block (18) is located between the adsorption tube (16), the external threaded ring (19) and the internal threaded ring (20); The surface of the cover plate (2) is provided with a sliding groove (21) corresponding to the position of the adsorption tube (16); the bottom of the adsorption tube (16) is fixedly connected to a bottom plate (22); the top of the internal thread ring (20) is fixedly connected to a top plate (23); and the cross-sections of the bottom plate (22) and the top plate (23) are both larger than those of the adsorption tube (16); Two symmetrically arranged lower magnetic blocks (30) are fixedly connected inside the bottom plate (22), and two symmetrically arranged mounting grooves (27) are provided inside the cover plate (2), and a magnetic attraction block (28) is fixedly connected inside each of the mounting grooves (27), and the magnetic attraction blocks (28) correspond in position to the lower magnetic blocks (30).

2. A sulfuric acid dropping device for producing polyaluminium sulfate according to claim 1, characterized in that: The cleaning assembly comprises a fixing ring (9), a connecting ring (10), an injection head (12), a connecting pipe (14) and a liquid inlet head (15); the fixing ring (9) is fixedly connected to the top of the heat exchange sleeve (3); the connecting ring (10) is fixedly connected to the top of the fixing ring (9); a plurality of injection heads (12) are fixedly connected to the inside and outside of the connecting ring (10); a guide groove (11) is provided in the connecting ring (10); the injection head (12) is communicated with the guide groove (11); the fixing ring (9) is provided with a guide groove (11) connected to the guide groove (11); 1), a connecting groove (13) connected to the heat exchange groove (5), a connecting pipe (14) connected to the connecting groove (13) is fixedly connected to the top of the inner wall of the heat exchange groove (5), one end of the connecting pipe (14) passes through the side wall of the sulfuric acid tank (1) along the liquid inlet pipe (6) and penetrates the outer wall of the liquid inlet pipe (6) near the heater (8), the end of the connecting pipe (14) located outside the sulfuric acid tank (1) is fixedly connected to a liquid inlet head (15), a sealing plug (32) is detachably connected to the liquid inlet head (15), and a drain pipe (31) is fixedly connected to the bottom of the sulfuric acid tank (1).

3. A sulfuric acid adding device for producing polyaluminium sulfate according to claim 2, characterized in that: Two symmetrically arranged positioning posts (25) are fixedly connected to the surface of the bottom plate (22), and a positioning groove (26) corresponding to the position of the positioning posts (25) is formed on the bottom surface of the cover plate (2).

4. A sulfuric acid dropping device for producing polyaluminium sulfate according to claim 3, characterized in that: Two symmetrically arranged upper magnetic blocks (29) are fixedly connected inside the top plate (23), and the positions of the upper magnetic blocks (29) and the magnetic attraction blocks (28) correspond to each other.

5. A sulfuric acid dropping device for producing polyaluminium sulfate according to claim 4, characterized in that: A handle (24) is fixedly connected to the surface of the top plate (23).

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