Multi-stage spray tower waste gas treatment device in polyaluminum chloride production

Abstract

This utility model discloses a multi-stage spray tower waste gas treatment device for polyaluminum chloride production, including a tank for treating waste gas during polyaluminum chloride production. The tank is equipped with an inlet pipe, and a spray head is installed at the outlet end of the inlet pipe. A filter layer is installed inside the tank, and a positive pressure fan is installed on the side of the tank. The positive pressure fan has an inlet pipe and an outlet pipe extending into the tank. A fixing cylinder is sleeved and fixed to the outlet pipe. This utility model, through its three-stage treatment tank, facilitates the treatment of waste gas from polyaluminum chloride production. Simultaneously, the positive and negative pressure fans on the tank increase the power of gas flow. A rotatable scraper at the bottom of the tank assists in discharging liquid into a circulation pool for recycling via the outlet and circulation pipes. Therefore, this multi-stage spray tower for polyaluminum chloride production achieves precise, graded waste gas treatment and long-term stable operation.

Description

Technical Field

[0001] This utility model relates to the field of polyaluminum chloride production technology, specifically to a multi-stage spray tower waste gas treatment device in polyaluminum chloride production. Background Technology

[0002] Polyaluminum chloride (PAC), or polyaluminum chloride for short, is a water-soluble inorganic polymer. It exhibits high charge neutralization and bridging effects on colloids and particulate matter in water, and can effectively remove toxic substances and heavy metal ions. It is stable and widely used as an emerging water purification material and coagulant in the treatment of drinking water, industrial wastewater, and municipal sewage. PAC is available in two types: one for drinking water and one for industrial water, each adhering to different relevant standards. It appears yellow or light yellow, dark brown, or dark gray, and exists in both liquid and solid forms. This product has strong bridging and adsorption properties; during hydrolysis, it undergoes physicochemical processes such as coagulation, adsorption, and precipitation. The fundamental difference between polyaluminum chloride (PAC) and traditional inorganic coagulants lies in their structure. Traditional inorganic coagulants are low-molecular-weight crystalline salts, while PAC is composed of multi-component carboxyl complexes with varying morphologies. It exhibits rapid flocculation and sedimentation, a wide applicable pH range, no corrosiveness to pipes and equipment, and significant water purification effects. It effectively removes color, suspended solids (SS), COD, BOD, and heavy metal ions such as arsenic and mercury from water. This product is widely used in drinking water, industrial water, and wastewater treatment.

[0003] In the production of polyaluminum chloride (PAC), the waste gas mainly originates from the reaction process of hydrochloric acid with bauxite / aluminum hydroxide and the spray drying process. Its composition is complex, containing high concentrations of hydrogen chloride, chlorine, PAC dust, and hydrochloric acid mist. Traditional waste gas treatment methods often employ single-stage spray towers or alkaline scrubbing towers. While existing technologies utilize two-stage spray towers or wet electrostatic precipitators, these still suffer from system complexity, high energy consumption, and difficulty in waste liquid treatment. Therefore, there is an urgent need to develop a staged, precise, and long-term stable waste gas treatment device. Utility Model Content

[0004] The purpose of this invention is to provide a multi-stage spray tower waste gas treatment device for polyaluminum chloride production. To address the above-mentioned problems, a three-stage series spray tower system is proposed. Through a gradient purification process of rapid cooling dust removal → deep neutralization → oxidation residue removal, ultra-low emissions of waste gas and recycling of waste liquid are achieved, which has significant economic and environmental advantages, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage spray tower waste gas treatment device for polyaluminum chloride production, comprising a tank for waste gas treatment in polyaluminum chloride production, an inlet pipe provided on the tank, a spray head provided at the outlet end of the inlet pipe, a filter layer provided inside the tank, a positive pressure fan provided on the side of the tank, an inlet pipe and an outlet pipe extending into the tank provided on the positive pressure fan, a fixing cylinder sleeved and fixed on the outlet pipe, a plurality of exhaust holes provided on the fixing cylinder, a support provided at the bottom of the tank, a drive motor provided on the support, a scraper provided on the output shaft of the drive motor, a negative pressure fan and an outlet pipe provided on the side of the tank away from the positive pressure fan, and an exhaust pipe and a circulation pipe provided on the negative pressure fan.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Preferably, the tank body includes a first processing tank, a second processing tank, and a third processing tank, and each of the first, second, and third processing tanks is equipped with a liquid inlet pipe, so that the three liquids can enter the first, second, and third processing tanks respectively to treat the gas in the different tanks. At the same time, the liquid sprayed in the first processing tank is water, which facilitates cooling of the gas; the liquid sprayed in the second processing tank is NaOH solution + surfactant solution, which facilitates neutralization of HCl and absorption of Cl2; and the liquid sprayed in the third processing tank is Na2CO3 + H2O2, which decomposes the NaClO remaining in the second processing tank.

[0008] Preferably, the spray head includes a concentric sleeve, and a plurality of spray nozzles are evenly spaced on the lower circumference of the concentric sleeve. A plurality of inclined liquid passage pipes are provided between the concentric sleeve and the liquid inlet pipe, so that the liquid is evenly sprayed into the inside of the tank through the pipes.

[0009] Preferably, the end of the fixed cylinder is fixedly connected to the inner wall of the tank, and the exhaust hole on the fixed cylinder penetrates the surface of the exhaust pipe. By setting the fixed cylinder, the stability of the exhaust pipe is increased, and the gas to be treated is made to enter the tank evenly.

[0010] Preferably, the drive motor is provided with a motor cover, and the drive motor is fixedly connected to the bottom of the tank through the motor cover. The output shaft of the drive motor passes through the bottom of the tank. A sealed bearing is provided between the drive motor and the tank. By providing a drive motor, it is convenient to increase the power of the scraper.

[0011] Preferably, two scrapers are symmetrically arranged on the output shaft of the drive motor, and the bottom of the scrapers is movably connected to the bottom wall of the tank. By setting the scrapers, it is easy to prevent sediment from forming inside the tank and facilitate subsequent stirring and discharge.

[0012] Preferably, negative pressure fans are provided on the sides of the first, second, and third processing tanks, and the exhaust pipes of the three negative pressure fans pass through the top of the first, second, and third processing tanks and extend into their interiors. By providing negative pressure fans, it is convenient to increase the power of gas circulation processing.

[0013] Preferably, the circulation pipes of the negative pressure fans on the sides of the first and second treatment tanks pass through the sides of the second and third treatment tanks and extend into their interiors, respectively, and the circulation pipes inside the second and third treatment tanks are fitted with fixed cylinders and have exhaust holes.

[0014] Preferably, the tank body is provided with a liquid outlet pipe and a cleaning pipe on its side, and the liquid outlet ends of the liquid outlet pipe and the cleaning pipe extend into the circulation pool. Both the liquid outlet pipe and the cleaning pipe are provided with control valves to facilitate the discharge of liquid from the tank body through the liquid outlet pipe and to allow the treated liquid to flow into the circulation pool for further processing.

[0015] Beneficial effects

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0017] This invention utilizes a three-stage treatment tank to facilitate the treatment of waste gas from polyaluminum chloride production. Positive and negative pressure fans are installed on the tank to increase the power of gas flow within the tank, thus facilitating waste gas treatment. A rotatable scraper at the bottom of the tank prevents sedimentation in the wastewater. Liquid is discharged into a recycling pool via an outlet pipe and a circulation pipe for reuse, reducing production costs. This multi-stage spray tower in polyaluminum chloride production achieves precise, graded waste gas treatment and long-term stable operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of a single tank of this utility model;

[0019] Figure 2 This is a schematic diagram of the three-tank front section structure of this utility model;

[0020] Figure 3 for Figure 2 A frontal view of the structure.

[0021] In the diagram: 1. Tank body; 101. First processing tank; 102. Second processing tank; 103. Third processing tank; 2. Liquid inlet pipe; 3. Spray head; 4. Filter layer; 5. Positive pressure fan; 6. Air inlet pipe; 7. Air outlet pipe; 8. Fixed cylinder; 9. Support; 10. Drive motor; 11. Scraper; 12. Negative pressure fan; 13. Liquid outlet pipe; 14. Suction pipe; 15. Circulation pipe; 16. Cleaning pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-3 This utility model provides a technical solution: a multi-stage spray tower waste gas treatment device for polyaluminum chloride production, including a tank 1 for treating waste gas in polyaluminum chloride production. The tank 1 is equipped with a liquid inlet pipe 2. The tank 1 includes a first treatment tank 101, a second treatment tank 102, and a third treatment tank 103, and each of the first treatment tank 101, the second treatment tank 102, and the third treatment tank 103 is equipped with a liquid inlet pipe 2, so that the three liquids can enter the first treatment tank 101, the second treatment tank 102, and the third treatment tank 103 respectively to treat the gas in the different tanks 1. At the same time, the liquid sprayed in the first treatment tank 101 is water, which facilitates cooling of the gas. The liquid sprayed in the second treatment tank 102 is NaOH solution + surfactant solution, which facilitates neutralization of HCl and absorption of Cl2. The liquid sprayed in the third treatment tank 103 is Na2CO3 + H2O2, which decomposes the NaClO remaining in the second treatment tank 102.

[0024] The outlet end of the liquid inlet pipe 2 is provided with a spray head 3. The spray head 3 includes a concentric sleeve, and several nozzles are evenly arranged on the lower circumference of the concentric sleeve. Several inclined liquid passage pipes are arranged between the concentric sleeve and the liquid inlet pipe 2, so that the liquid can be evenly sprayed into the inside of the tank 1 through the pipes.

[0025] A filter layer 4 is provided inside the tank body 1. A positive pressure fan 5 is provided on the side of the tank body 1. An air inlet pipe 6 and an air outlet pipe 7 extending into the tank body 1 are respectively provided on the positive pressure fan 5. A fixing cylinder 8 is sleeved and fixed on the air outlet pipe 7. Several exhaust holes are opened on the fixing cylinder 8. The end of the fixing cylinder 8 is fixedly connected to the inner wall of the tank body 1, and the exhaust holes on the fixing cylinder 8 penetrate through the surface of the air outlet pipe 7. By setting the fixing cylinder 8, the stability of the air outlet pipe 7 is increased, and the gas to be treated is made to enter the tank body 1 evenly.

[0026] A support 9 is provided at the bottom of the tank body 1, and a drive motor 10 is provided on the support 9. The drive motor 10 is provided with a motor cover, and the drive motor 10 is fixedly connected to the bottom of the tank body 1 through the motor cover. The output shaft of the drive motor 10 passes through the bottom of the tank body 1. A sealed bearing is provided between the drive motor 10 and the tank body 1. By providing the drive motor 10, it is convenient to increase the power of the scraper 11.

[0027] A scraper 11 is provided on the output shaft of the drive motor 10. Two scrapers 11 are symmetrically arranged on the output shaft of the drive motor 10, and the bottom of the scraper 11 is movably connected to the bottom wall of the tank 1. By setting the scraper 11, it is easy to prevent sediment from appearing inside the tank 1 and to facilitate subsequent stirring and discharge.

[0028] A negative pressure fan 12 and a liquid outlet pipe 13 are respectively provided on the side of the tank body 1 away from the positive pressure fan 5. Negative pressure fans 12 are provided on the sides of the first treatment tank 101, the second treatment tank 102 and the third treatment tank 103. The exhaust pipes 14 of the three negative pressure fans 12 pass through the top of the first treatment tank 101, the second treatment tank 102 and the third treatment tank 103 respectively and extend into their interiors. By providing negative pressure fans 12, it is convenient to increase the power of gas circulation treatment.

[0029] The negative pressure fan 12 is provided with an exhaust pipe 14 and a circulation pipe 15. The circulation pipes 15 of the negative pressure fan 12 on the side of the first treatment tank 101 and the second treatment tank 102 pass through the side of the second treatment tank 102 and the third treatment tank 103 and extend into their interiors. The circulation pipes 15 inside the second treatment tank 102 and the third treatment tank 103 are fitted with a fixing cylinder 8 and have an exhaust hole.

[0030] The tank body 1 is provided with a liquid outlet pipe 13 and a cleaning pipe 16 on its side. The liquid outlet ends of the liquid outlet pipe 13 and the cleaning pipe 16 extend into the circulation pool. Both the liquid outlet pipe 13 and the cleaning pipe 16 are provided with control valves to facilitate the discharge of liquid from the tank body 1 through the liquid outlet pipe 13 and to allow the treated liquid to flow into the circulation pool for further processing.

[0031] In this embodiment, the three-stage treatment tank facilitates the treatment of waste gas from polyaluminum chloride production. Simultaneously, a positive pressure fan 5 and a negative pressure fan 12 are installed on the tank body 1 to increase the power of gas flow within the tank body 1, thus facilitating waste gas treatment. A rotatable scraper 11 is installed at the bottom of the tank body 1 to prevent sedimentation of substances in the wastewater. The liquid is discharged into a recycling pool via the outlet pipe 13 and circulation pipe 15 for reuse, reducing production costs. Therefore, this multi-stage spray tower in polyaluminum chloride production achieves the effect of precise, graded treatment of waste gas and long-term stable operation.

[0032] The mechanisms, components, and parts in this utility model that are not specifically described are all existing structures that already exist in the prior art and can be purchased directly from the market.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage spray tower exhaust gas treatment device for polyaluminum chloride production, characterized in that: The system includes a tank (1) for treating waste gas during the production of polyaluminum chloride. The tank (1) is equipped with an inlet pipe (2), and a spray head (3) is installed at the outlet end of the inlet pipe (2). A filter layer (4) is installed inside the tank (1). A positive pressure fan (5) is installed on the side of the tank (1). The positive pressure fan (5) is equipped with an inlet pipe (6) and an outlet pipe (7) extending into the tank (1). A fixing sleeve is fitted and fixed to the outlet pipe (7). 8) The fixed cylinder (8) has several exhaust holes. The bottom of the tank (1) is provided with a bracket (9). The bracket (9) is provided with a drive motor (10). The output shaft of the drive motor (10) is provided with a scraper (11). The side of the tank (1) away from the positive pressure fan (5) is provided with a negative pressure fan (12) and a liquid outlet pipe (13). The negative pressure fan (12) is provided with a suction pipe (14) and a circulation pipe (15).

2. The multi-stage spray tower exhaust gas treatment device for polyaluminum chloride production according to claim 1, characterized in that: The tank body (1) includes a first processing tank (101), a second processing tank (102) and a third processing tank (103), and each of the first processing tank (101), the second processing tank (102) and the third processing tank (103) is provided with a liquid inlet pipe (2).

3. The multi-stage spray tower exhaust gas treatment device for polyaluminum chloride production according to claim 1, characterized in that: The spray head (3) includes a concentric sleeve, and several nozzles are evenly spaced on the lower circumference of the concentric sleeve. Several inclined liquid passage pipes are arranged between the concentric sleeve and the liquid inlet pipe (2).

4. The multi-stage spray tower exhaust gas treatment device for polyaluminum chloride production according to claim 1, characterized in that: The end of the fixed cylinder (8) is fixedly connected to the inner wall of the tank (1), and the exhaust hole on the fixed cylinder (8) penetrates the surface of the exhaust pipe (7).

5. The multi-stage spray tower waste gas treatment device for polyaluminum chloride production according to claim 1, characterized in that: The drive motor (10) is provided with a motor cover, and the drive motor (10) is fixedly connected to the bottom of the tank (1) through the motor cover. The output shaft of the drive motor (10) passes through the bottom of the tank (1), and a sealed bearing is provided between the drive motor (10) and the tank (1).

6. The multi-stage spray tower exhaust gas treatment device for polyaluminum chloride production according to claim 1, characterized in that: Two scrapers (11) are symmetrically arranged on the output shaft of the drive motor (10), and the bottom of the scraper (11) is movably connected to the bottom wall of the tank (1).

7. The multi-stage spray tower exhaust gas treatment device for polyaluminum chloride production according to claim 2, characterized in that: The first processing tank (101), the second processing tank (102) and the third processing tank (103) are each provided with a negative pressure fan (12) on their side, and the exhaust pipe (14) of the three negative pressure fans (12) passes through the top of the first processing tank (101), the second processing tank (102) and the third processing tank (103) and extends into their interiors.

8. The multi-stage spray tower exhaust gas treatment device for polyaluminum chloride production according to claim 7, characterized in that: The circulation pipes (15) of the negative pressure fans (12) on the sides of the first treatment tank (101) and the second treatment tank (102) respectively pass through the sides of the second treatment tank (102) and the third treatment tank (103) and extend into their interiors. The circulation pipes (15) inside the second treatment tank (102) and the third treatment tank (103) are fitted with fixed cylinders (8) and have exhaust holes.

9. The multi-stage spray tower exhaust gas treatment device for polyaluminum chloride production according to claim 1, characterized in that: The tank body (1) is provided with a liquid outlet pipe (13) and a cleaning pipe (16) on its side. The liquid outlet ends of the liquid outlet pipe (13) and the cleaning pipe (16) extend into the circulation pool, and control valves are provided on the liquid outlet pipe (13) and the cleaning pipe (16).

Images