Hazardous waste acid pretreatment closed neutralization reactor kettle treatment system and control method

Abstract

The application discloses a closed neutralization reaction kettle treatment system and a control method for hazardous waste acid pretreatment, and comprises a plurality of reaction kettles, wherein the reaction kettle comprises a sealed reaction kettle main body, a plurality of sealed reaction kettle inner cavities are arranged in the sealed reaction kettle main body, the plurality of sealed reaction kettle inner cavities at least comprise a first-stage neutralization reaction cavity located at the uppermost layer, an alkaline neutralization liquid input module with a concentration not greater than 50% and a PH value of 8, and a tail gas waste acid liquid conveying module are arranged in the first-stage neutralization reaction cavity; a second-stage neutralization reaction cavity and a third-stage static neutralization reaction cavity are located below the first-stage neutralization reaction cavity; after hazardous waste acid and acidic industrial tail gas are mixed, the mixture enters the first-stage neutralization reaction cavity for neutralization treatment to form a first-stage neutralization treatment carrier liquid, the second-stage neutralization reaction cavity is used for neutralization treatment to obtain a second-stage neutralization treatment carrier liquid, and the third-stage static neutralization reaction cavity is used for forming static three-stage neutralization at a temperature of 45 DEG C; and then, the pretreated waste acid flows into a neutralization reaction post-treatment water conveying pipe.

Description

Technical Field

[0001] This invention relates to environmental protection technology and its equipment, specifically, to a closed-loop neutralization reactor system and control method for the pretreatment of hazardous waste acid. Background Technology

[0002] In modern industrial production technology, some production processes that generate waste acid often produce acidic tail gas. Currently, the tail gas and waste acid are treated separately, which seriously wastes production resources.

[0003] Therefore, it is necessary to provide a closed-loop neutralization reactor system and control method for the pretreatment of hazardous waste acid to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a closed neutralization reactor system and control method for the pretreatment of hazardous waste acid.

[0005] One of the technical solutions is as follows: A closed neutralization reactor system for the pretreatment of hazardous waste acid includes several reactors. Each reactor includes a sealed reactor body. The sealed reactor body is provided with several sealed reactor cavities. The several sealed reactor cavities include at least a first-stage neutralization reaction chamber located at the top. The first-stage neutralization reaction chamber is provided with an alkaline neutralization liquid input module with a concentration of no more than 50% and a pH value of 8, and a tail gas waste acid liquid conveying module. The second-stage neutralization reaction chamber and the third-stage static neutralization reaction chamber are located below the first-stage neutralization reaction chamber. The input module for alkaline neutralizing liquid with a concentration of no more than 50% and a pH of 8 is used as the pre-filling actuator for the first-stage neutralizing liquid. Before the exhaust gas waste acid liquid conveying module conveys the treated product, it pre-fills the first-stage neutralizing reaction chamber with alkaline neutralizing liquid with a concentration of no more than 50% and a pH of 8, accounting for 30-40% of the inner chamber volume. Hazardous waste acid and acidic industrial tail gas are mixed and then enter the first-stage neutralization reaction chamber. Neutralization is carried out for 40-45 minutes using a neutralizing liquid, forming a primary neutralization carrier liquid. This primary neutralization carrier liquid flows into the second-stage neutralization reaction chamber, where neutralizing liquid continues to be introduced for a second-stage neutralization process of 30-35 minutes, resulting in a secondary neutralization carrier liquid. This secondary neutralization carrier liquid then flows into the third-stage static neutralization reaction chamber, where a static reaction environment at 45°C is created for 20-25 minutes of tertiary neutralization. The resulting pre-treated waste acid then flows into the post-neutralization treatment water delivery pipe.

[0006] The second technical solution is: A control method for a closed neutralization reactor system for the pretreatment of hazardous waste acid includes a closed neutralization reactor system for the pretreatment of hazardous waste acid. The closed neutralization reactor system for the pretreatment of hazardous waste acid includes several reactors. Each reactor includes a sealed reactor body. The sealed reactor body is provided with several sealed reactor cavities. The several sealed reactor cavities include at least a first-stage neutralization reaction chamber located at the top. The first-stage neutralization reaction chamber is provided with an alkaline neutralization liquid input module with a concentration of no more than 50% and a pH value of 8, and a tail gas waste acid liquid conveying module. The second-stage neutralization reaction chamber and the third-stage static neutralization reaction chamber are located below the first-stage neutralization reaction chamber. The control flow is: 1) The input module of alkaline neutralizing liquid with a concentration of no more than 50% and a pH value of 8 is used as the first-stage neutralizing liquid pre-filling actuator. Before the tail gas waste acid liquid conveying module conveys the treated product, it is pre-filled with alkaline neutralizing liquid with a concentration of no more than 50% and a pH value of 8, accounting for 30-40% of the inner cavity volume of the first-stage neutralization reaction chamber. 2) After the hazardous waste acid and acidic industrial tail gas are mixed, they enter the first-stage neutralization reaction chamber and are neutralized by the neutralization liquid for 40-45 minutes to form the carrier liquid for the first neutralization treatment. 21) The carrier liquid of the first neutralization treatment falls into the second neutralization reaction chamber, and the second neutralization reaction chamber continues to be fed with neutralizing liquid for a second neutralization treatment of 30-35 minutes to obtain the carrier liquid of the second neutralization treatment; 22) The secondary neutralization treatment carrier liquid falls into the third-stage static neutralization reaction chamber, and a static reaction environment with a temperature of 45°C is formed in the third-stage static neutralization reaction chamber. The static three-stage neutralization is carried out for 20-25 minutes, and then the pre-treated waste acid flows into the neutralization reaction post-treatment water delivery pipe.

[0007] Furthermore, a confluence ramp A is provided at the bottom of the first-stage neutralization reaction chamber, which is connected to a collection ramp A, and a drain control valve A is provided in the middle of the collection ramp A.

[0008] Furthermore, the exhaust gas waste acid liquid conveying module includes an exhaust gas waste acid liquid mixture input pipe, which is inserted from the top side of the reactor body, with its tail end located above the confluence slope A, at a height not exceeding 5cm.

[0009] Furthermore, the first-stage neutralization reaction chamber and the second-stage neutralization reaction chamber are respectively equipped with a first-stage explosion-proof exhaust valve and a second-stage explosion-proof exhaust valve.

[0010] Furthermore, the second-stage neutralization reaction chamber is equipped with an input module for an alkaline neutralizing liquid with a concentration of not less than 70% and a pH value of 9. A confluence ramp B is installed at the bottom of the second-stage neutralization reaction chamber, which is connected to a collection ramp B. A drain control valve B is installed in the middle of the collection ramp B.

[0011] Furthermore, an auxiliary heating module is installed in the third-stage static neutralization reaction chamber, and a confluence ramp C is installed at the bottom of the third-stage static neutralization reaction chamber. The confluence ramp C is connected to a collection ramp C. A drain control valve C is installed in the middle of the collection ramp C. The third-stage static neutralization reaction chamber is connected to the neutralization reaction post-treatment water delivery pipe through a pipeline.

[0012] Furthermore, the input modules for alkaline neutralizing liquid with a concentration of no more than 50% and a pH of 8, and the input modules for alkaline neutralizing liquid with a concentration of no less than 70% and a pH of 9, both include a neutralizing liquid delivery and collection pipe. The neutralizing liquid delivery and collection pipe is connected to several branch pipes, and the branch pipes are evenly provided with outlet holes with a diameter of no more than 1 cm.

[0013] Furthermore, the slopes of confluence slopes A, B, and C are all 60°.

[0014] Furthermore, the slopes of the flow collection ramps A, B, and C are all 45°.

[0015] Compared with existing technologies, this invention can centrally treat industrial acidic exhaust gas and hazardous waste acid in an integrated manner, reducing the treatment cost of industrial waste acid and exhaust gas. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the neutralizing liquid delivery and collection pipe.

[0018] Figure 3 This is a schematic diagram of the auxiliary heating module. Detailed Implementation Example:

[0019] Please see Figures 1 to 3 This embodiment demonstrates a control method for a closed neutralization reactor system for the pretreatment of hazardous waste acid, including a closed neutralization reactor system for the pretreatment of hazardous waste acid. The closed neutralization reactor system for the pretreatment of hazardous waste acid includes several reactors 100. Each reactor 100 includes a sealed reactor body 1. The sealed reactor body 1 is provided with several sealed reactor cavities. The several sealed reactor cavities include at least a first-stage neutralization reaction chamber 2 located at the top. The first-stage neutralization reaction chamber 2 is provided with an alkaline neutralization liquid input module 3 with a concentration of not more than 50% and a pH value of 8, and a tail gas waste acid liquid conveying module 4. The input module 3, which is an alkaline neutralizing liquid with a concentration of no more than 50% and a pH of 8, is used as the pre-filling actuator for the first-stage neutralizing liquid. Before the exhaust gas waste acid liquid conveying module 4 conveys the treated product, it pre-fills the first-stage neutralizing reaction chamber 2 with an alkaline neutralizing liquid with a concentration of no more than 50% and a pH of 8, accounting for 30-40% of the chamber volume. Below the first-stage neutralization reaction chamber 2, the second-stage neutralization reaction chamber 5 and the third-stage static neutralization reaction chamber 6 are arranged in sequence. The third-stage static neutralization reaction chamber 6 is connected to the post-neutralization water delivery pipe 7 through a pipeline.

[0020] The bottom of the first-stage neutralization reaction chamber 2 is provided with a confluence ramp A21, which is connected to a collection ramp A22. A drain control valve A23 is provided in the middle of the collection ramp A22.

[0021] The tail gas waste acid liquid conveying module 4 includes a tail gas waste acid liquid mixture input pipe 41, which is inserted from the top side of the reactor body 1, with its tail end located above the confluence slope A21 and a height not exceeding 5cm.

[0022] The first-stage neutralization reaction chamber 2 and the second-stage neutralization reaction chamber 5 are respectively equipped with a first-stage explosion-proof exhaust valve 8 and a second-stage explosion-proof exhaust valve 81.

[0023] The second-stage neutralization reaction chamber 5 is equipped with an alkaline neutralizing liquid input module 51 with a concentration of not less than 70% and a pH value of 9. The bottom of the second-stage neutralization reaction chamber 5 is equipped with a confluence ramp B52, which is connected to a collection ramp B53. A drain control valve B54 is installed in the middle of the collection ramp B53.

[0024] An auxiliary heating module 61 is installed in the third-stage static neutralization reaction chamber 6, and a confluence ramp C62 is installed at the bottom of the third-stage static neutralization reaction chamber 6. The confluence ramp C62 is connected to a collection ramp C63, and a drain control valve C64 is installed in the middle of the collection ramp C63.

[0025] The input module 3 for alkaline neutralizing liquid with a concentration of not more than 50% and a pH value of 8, and the input module 51 for alkaline neutralizing liquid with a concentration of not less than 70% and a pH value of 9, both include a neutralizing liquid delivery and collection pipe 31. The neutralizing liquid delivery and collection pipe 31 is connected to several branch pipes 32, and the branch pipes 32 are evenly provided with liquid outlet holes with a diameter of not more than 1 cm.

[0026] The slopes of confluence slopes A21, B52, and C62 are all 60°.

[0027] The slopes of the flow collection ramps A22, B53, and C63 are all 45°.

[0028] The auxiliary heating module 61 is used as a heating actuator to heat the static neutral environment to 45°C.

[0029] The control flow is: 1) The input module of alkaline neutralizing liquid with a concentration of no more than 50% and a pH value of 8 is used as the first-stage neutralizing liquid pre-filling actuator. Before the tail gas waste acid liquid conveying module conveys the treated product, it is pre-filled with alkaline neutralizing liquid with a concentration of no more than 50% and a pH value of 8, accounting for 30-40% of the inner cavity volume of the first-stage neutralization reaction chamber. 2) After the hazardous waste acid and acidic industrial tail gas are mixed, they enter the first-stage neutralization reaction chamber and are neutralized by the neutralization liquid for 40-45 minutes to form the carrier liquid for the first neutralization treatment. 21) The carrier liquid of the first neutralization treatment falls into the second neutralization reaction chamber, and the second neutralization reaction chamber continues to be fed with neutralizing liquid for a second neutralization treatment of 30-35 minutes to obtain the carrier liquid of the second neutralization treatment; 22) The secondary neutralization treatment carrier liquid falls into the third-stage static neutralization reaction chamber, and a static reaction environment with a temperature of 45°C is formed in the third-stage static neutralization reaction chamber. The static three-stage neutralization is carried out for 20-25 minutes, and then the pre-treated waste acid flows into the neutralization reaction post-treatment water delivery pipe.

[0030] in: The input rate of an alkaline neutralizing solution with a concentration of no more than 50% and a pH of 8 should not exceed 5 liters per minute.

[0031] The input rate of the alkaline neutralizing solution with a concentration of not less than 70% and a pH value of 9 shall not be less than 3 liters per minute.

[0032] Compared with existing technologies, this invention can centrally treat industrial acidic exhaust gas and hazardous waste acid in an integrated manner, reducing the treatment cost of industrial waste acid and exhaust gas.

[0033] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A closed-loop neutralization reactor system for the pretreatment of hazardous waste acid, characterized in that: It includes several reaction vessels, each including a sealed reaction vessel body. The sealed reaction vessel body is provided with several sealed reaction vessel cavities. Each of the several sealed reaction vessel cavities includes at least a first-stage neutralization reaction cavity located at the top. The first-stage neutralization reaction cavity is provided with an alkaline neutralization liquid input module with a concentration of no more than 50% and a pH value of 8, and a tail gas waste acid liquid conveying module. The second-stage neutralization reaction chamber and the third-stage static neutralization reaction chamber are located below the first-stage neutralization reaction chamber. The input module for alkaline neutralizing liquid with a concentration of no more than 50% and a pH of 8 is used as the pre-filling actuator for the first-stage neutralizing liquid. Before the exhaust gas waste acid liquid conveying module conveys the treated product, it pre-fills the first-stage neutralizing reaction chamber with alkaline neutralizing liquid with a concentration of no more than 50% and a pH of 8, accounting for 30-40% of the inner chamber volume. Hazardous waste acid and acidic industrial tail gas are mixed and then enter the first-stage neutralization reaction chamber. Neutralization is carried out for 40-45 minutes using a neutralizing liquid, forming a primary neutralization carrier liquid. This primary neutralization carrier liquid flows into the second-stage neutralization reaction chamber, where neutralizing liquid continues to be introduced for a second-stage neutralization process of 30-35 minutes, resulting in a secondary neutralization carrier liquid. This secondary neutralization carrier liquid then flows into the third-stage static neutralization reaction chamber, where a static reaction environment at 45°C is created for 20-25 minutes of tertiary neutralization. The resulting pre-treated waste acid then flows into the post-neutralization treatment water delivery pipe.

2. A control method for a closed neutralization reactor system for the pretreatment of hazardous waste acid, characterized in that: The system includes a closed-loop neutralization reactor for the pretreatment of hazardous waste acid. The closed-loop neutralization reactor for the pretreatment of hazardous waste acid includes several reactors. Each reactor includes a sealed reactor body. The sealed reactor body is provided with several sealed reactor cavities. Each of the several sealed reactor cavities includes at least a first-stage neutralization reaction chamber located at the top. The first-stage neutralization reaction chamber is provided with an alkaline neutralization liquid input module with a concentration of no more than 50% and a pH value of 8, and a tail gas waste acid liquid conveying module. The second-stage neutralization reaction chamber and the third-stage static neutralization reaction chamber are located below the first-stage neutralization reaction chamber. The control flow is: 1) The input module of alkaline neutralizing liquid with a concentration of no more than 50% and a pH value of 8 is used as the first-stage neutralizing liquid pre-filling actuator. Before the tail gas waste acid liquid conveying module conveys the treated product, it is pre-filled with alkaline neutralizing liquid with a concentration of no more than 50% and a pH value of 8, accounting for 30-40% of the inner cavity volume of the first-stage neutralization reaction chamber. 2) After the hazardous waste acid and acidic industrial tail gas are mixed, they enter the first-stage neutralization reaction chamber and are neutralized by the neutralization liquid for 40-45 minutes to form the carrier liquid for the first neutralization treatment. 21) The carrier liquid of the first neutralization treatment falls into the second neutralization reaction chamber, and the second neutralization reaction chamber continues to be fed with neutralizing liquid for a second neutralization treatment of 30-35 minutes to obtain the carrier liquid of the second neutralization treatment; 22) The secondary neutralization treatment carrier liquid falls into the third-stage static neutralization reaction chamber, and a static reaction environment with a temperature of 45°C is formed in the third-stage static neutralization reaction chamber. The static three-stage neutralization is carried out for 20-25 minutes, and then the pre-treated waste acid flows into the neutralization reaction post-treatment water delivery pipe.

3. The control method for a closed neutralization reactor treatment system for hazardous waste acid pretreatment according to claim 2, characterized in that: The bottom of the first-stage neutralization reaction chamber is equipped with a confluence ramp A, which is connected to a collection ramp A. A drain control valve A is installed in the middle of the collection ramp A.

4. The control method for a closed neutralization reactor treatment system for hazardous waste acid pretreatment according to claim 3, characterized in that: The tail gas waste acid liquid conveying module includes a tail gas waste acid liquid mixture input pipe, which is inserted from the top side of the reactor body, with the tail end located above the confluence slope A, at a height of no more than 5cm.

5. The control method for a closed neutralization reactor treatment system for hazardous waste acid pretreatment according to claim 4, characterized in that: The first-stage neutralization reaction chamber and the second-stage neutralization reaction chamber are respectively equipped with a first-stage explosion-proof exhaust valve and a second-stage explosion-proof exhaust valve.

6. The control method for a closed neutralization reactor treatment system for hazardous waste acid pretreatment according to claim 5, characterized in that: The second-stage neutralization reaction chamber is equipped with an input module for an alkaline neutralizing liquid with a concentration of not less than 70% and a pH value of 9. A flow-collecting ramp B is installed at the bottom of the second-stage neutralization reaction chamber, and the flow-collecting ramp B is connected to a collection ramp B. A drain control valve B is installed in the middle of the collection ramp B.

7. The control method for a closed neutralization reactor treatment system for hazardous waste acid pretreatment according to claim 6, characterized in that: An auxiliary heating module is installed in the third-stage static neutralization reaction chamber, and a flow-collecting ramp C is installed at the bottom of the third-stage static neutralization reaction chamber. The flow-collecting ramp C is connected to a collection ramp C, and a drain control valve C is installed in the middle of the collection ramp C.

8. The control method for a closed neutralization reactor treatment system for hazardous waste acid pretreatment according to claim 7, characterized in that: The input modules for alkaline neutralizing liquid with a concentration of no more than 50% and a pH of 8, and the input modules for alkaline neutralizing liquid with a concentration of no less than 70% and a pH of 9, both include a neutralizing liquid delivery and collection pipe. The neutralizing liquid delivery and collection pipe is connected to several branch pipes, and the branch pipes are evenly provided with outlet holes with a diameter of no more than 1 cm.

9. The control method for a closed neutralization reactor treatment system for hazardous waste acid pretreatment according to claim 8, characterized in that: The slopes of confluence slopes A, B, and C are all 60°.

10. The control method for a closed neutralization reactor treatment system for hazardous waste acid pretreatment according to claim 9, characterized in that: The slopes of the flow collection ramps A, B, and C are all 45°.

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