A VOCs-containing acid mist absorption system

Abstract

This invention provides a VOCs-containing acid mist absorption system, comprising an absorption tower, an acid mist adsorption device connected to the absorption tower, a fan connected to the acid mist adsorption device, and an alkali tank connected to the absorption tower via an alkali replenishment pump. A circulation pump and a sewage pump are respectively connected to the side of the absorption tower. A level gauge, a second pressure monitoring gauge, and a pH meter are installed inside the absorption tower. The circulation pump is connected to a dynamic wave regulating valve and a spray regulating valve. A first pressure monitoring gauge is installed on the pipeline between the dynamic wave regulating valve and the absorption tower. An acid mist pipeline is provided at the inlet of the absorption tower. This invention absorbs and discharges VOCs-containing acid mist from the extraction system in a compliant manner through primary dynamic wave absorption, primary packing absorption, and primary activated carbon absorption, ensuring a clean working environment in the extraction production system.

Description

Technical Field

[0001] This utility model belongs to the field of hydrometallurgical technology and relates to an acid mist absorption system containing VOCs. Background Technology

[0002] In existing extraction production systems, sulfuric acid mist and organic solvent volatilization have become bottlenecks restricting the clean production process. Specifically, during the operation of key equipment such as extraction tanks and back-extraction tanks, sulfuric acid mist continuously generated at the gas-liquid interface combines with volatile solvent oils such as sulfonated kerosene in the organic phase to form complex acid mist containing volatile organic compounds (VOCs). Existing technologies mostly use dynamic wave scrubbing towers for treatment, but the absorption effect is poor when dealing with VOCs-containing acid mist, resulting in excessive VOC concentrations in the working environment. Therefore, there is an urgent need for a VOCs-containing acid mist absorption system to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to address the problems existing in the prior art by providing a VOCs-containing acid mist absorption system, which solves the problem that existing extraction production systems cannot effectively absorb and treat VOCs-containing acid mist.

[0004] Therefore, the present invention adopts the following technical solution:

[0005] A VOCs-containing acid mist absorption system includes an absorption tower, with a circulation pump and a sewage pump connected to its side. The absorption tower is equipped with a level gauge, a second pressure monitoring gauge and a pH meter. The circulation pump is connected to a dynamic wave regulating valve and a spray regulating valve. A first pressure monitoring gauge is installed on the pipeline between the dynamic wave regulating valve and the absorption tower. An acid mist pipeline is installed at the inlet of the absorption tower.

[0006] An acid mist adsorption device is connected to an absorption tower, and a third pressure gauge is installed on the pipeline between the two.

[0007] The fan is connected to the acid mist adsorption device, and a fourth pressure gauge is installed on the pipeline between the two.

[0008] The alkali tank is connected to the absorption tower via an alkali replenishment pump. An alkali replenishment pump inlet valve is installed on the pipeline between the alkali tank and the alkali replenishment pump. An automatic alkali replenishment valve is installed on the pipeline between the alkali replenishment pump and the absorption tower. An alkali reflux valve is installed on the pipeline between the alkali tank and the absorption tower. The alkali reflux valve and the alkali replenishment pump are connected in parallel.

[0009] Furthermore, the absorption tower includes a tower body, in which a foam trap, a spray pipe, packing material, and absorbent liquid are arranged sequentially from top to bottom. A dynamic wave feed pipe is provided on the side of the tower body, and the two are connected through a dynamic wave transition section. A dynamic wave nozzle is provided inside the dynamic wave feed pipe.

[0010] Furthermore, the acid mist adsorption device includes an acid mist adsorption device housing, wherein a skid-mounted activated carbon is provided inside the acid mist adsorption device housing and an activated carbon addition port is provided on the outer wall.

[0011] Furthermore, the bottom of the spray cloth pipe is provided with several spiral nozzles arranged in parallel.

[0012] Furthermore, the fan and the second pressure monitoring gauge are interlocked.

[0013] Furthermore, the sewage pump and the level gauge are interlocked.

[0014] Furthermore, the automatic alkali replenishment valve is interlocked with the pH meter and the level gauge, respectively.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. This utility model adopts dynamic wave absorption as the first-stage absorption, that is, it utilizes the high-speed collision of the gas-liquid two-phase region to allow most of the volatile organic compounds (VOCs) in the waste gas to enter the absorption liquid through physical dissolution. The gas-liquid contact efficiency is high, and high concentrations of VOCs can be removed quickly.

[0017] 2. This utility model adopts spray absorption as a secondary absorption method. The absorbent liquid is atomized by the spray device and comes into contact with the waste gas in the opposite direction to further absorb residual VOCs. It serves as a supplement to the primary absorption to ensure that the VOCs removal rate meets the standard. Specific absorbent liquids can be selected according to the composition of the waste gas to improve the targeting.

[0018] 3. This invention uses activated carbon adsorption as a safety measure and as a final treatment stage to adsorb trace amounts of VOCs that were not completely removed in the first two stages, ensuring that the emitted exhaust gas meets environmental protection standards. Activated carbon has a high specific surface area and adsorption capacity, and its removal effect on low-concentration VOCs is significant.

[0019] Regularly replace or regenerate activated carbon to avoid secondary pollution caused by adsorption saturation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the acid mist adsorption device in this utility model;

[0022] Figure 3 This is a schematic diagram of the absorption tower in this utility model.

[0023] In the diagram, 1-circulating pump, 2-sewage pump, 3-level gauge, 4-dynamic wave regulating valve, 5-spray regulating valve, 6-absorption tower, 6-1-absorbent liquid, 6-2-tower body, 6-3-dynamic wave transition section, 6-4-dynamic wave nozzle, 6-5-dynamic wave feed pipe, 6-6-foam trap, 6-7-spray liquid distribution pipe, 6-8-spiral nozzle, 6-9-packing, 7-first pressure gauge, 8-acid mist pipeline, 9-second pressure gauge, 10-third pressure gauge, 11-acid mist adsorption device, 11-1-acid mist adsorption device shell, 11-2-activated carbon addition port, 11-3-skid-mounted activated carbon, 12-fourth pressure gauge, 13-fan, 14-alkali tank, 15-alkali replenishment pump inlet valve, 16-alkali reflux valve, 17-alkali replenishment pump, 18-automatic alkali replenishment valve, 19-pH meter. Detailed Implementation

[0024] The technical solution of this utility model will be described below with reference to the accompanying drawings and implementation methods.

[0025] like Figure 1 As shown, a VOCs-containing acid mist absorption system includes:

[0026] The absorption tower 6 has a circulation pump 1 and a sewage pump 2 connected to its side. The absorption tower 6 is equipped with a level gauge 3, a second pressure monitoring gauge 9 and a pH meter 19. The circulation pump 1 is connected to the power wave regulating valve 4 and the spray regulating valve 5 respectively. The first pressure monitoring gauge 7 is installed on the pipeline between the power wave regulating valve 4 and the absorption tower 6. The absorption tower 6 is equipped with an acid mist pipeline 8 at the inlet.

[0027] The alkali tank 14 is connected to the absorption tower 6 via the alkali replenishment pump 17. The pipeline between the alkali tank 14 and the alkali replenishment pump 17 is equipped with an alkali replenishment pump inlet valve 15. The pipeline between the alkali replenishment pump 17 and the absorption tower 6 is equipped with an automatic alkali replenishment valve 18. The pipeline between the alkali tank 14 and the absorption tower 6 is equipped with an alkali reflux valve 16, and the alkali reflux valve 16 and the alkali replenishment pump 17 are arranged in parallel.

[0028] like Figure 2As shown, the acid mist adsorption device 11 includes an acid mist adsorption device housing 11-1, inside which is a skid-mounted activated carbon 11-3 and on the outer wall is an activated carbon inlet 11-2; the acid mist adsorption device 11 is connected to the absorption tower 6, and a third pressure gauge 10 is installed on the pipeline between the two; a fan 13 is connected to the acid mist adsorption device 11, and a fourth pressure gauge 12 is installed on the pipeline between the two; specifically, the skid-mounted activated carbon 11-3 is added into the acid mist adsorption device housing 11-1 through the activated carbon inlet 11-2, and the front and rear connecting pipelines of the acid mist adsorption device 11 are respectively equipped with a third pressure gauge 10 and a fourth pressure gauge 12, and the pressure difference between the two is compared to determine whether the skid-mounted activated carbon 11-3 needs to be replaced.

[0029] like Figure 3 As shown, the absorption tower 6 includes a tower body 6-2. Inside the tower body 6-2, from top to bottom, there are a foam trap 6-6, a spray liquid pipe 6-7, packing 6-9, and absorbent liquid 6-1. A dynamic wave feed pipe 6-5 is provided on the side of the tower body 6-2, and the two are connected by a dynamic wave transition section 6-3. A dynamic wave nozzle 6-4 is provided inside the dynamic wave feed pipe 6-5. Several spiral nozzles 6-8 are arranged in parallel at the bottom of the spray liquid pipe 6-7. The foam trap 6-6 is used to eliminate foam carried by the gas, and the amount of water carried by the acid mist is further reduced, which facilitates the reduction of the amount of absorbent liquid discharged from the absorption tower 6.

[0030] The working principle of the absorption tower 6 is as follows: the outlet of the circulating pump 1 is divided into two paths. One path transports the absorbent liquid in the absorption tower 6 to the dynamic wave nozzle 6-4. The flow rate of the dynamic wave nozzle 6-4 is adjusted by the valve opening, and the absorbent liquid is transported to the spray distribution pipe 6-7. The absorbent liquid is evenly distributed onto the packing 6-9 by several spiral nozzles 6-8. In addition, the spray regulating valve 5 adjusts the spray volume of the absorbent liquid on the packing 6-9 by the opening of the spray regulating valve 5. The first pressure monitoring gauge 7 determines the flow rate by judging the pressure of the dynamic wave feed pipe 6-5.

[0031] The blower 13 is interlocked with the second pressure monitoring gauge 9; the second pressure monitoring gauge 9 determines whether the inside of the absorption tower 6 is under negative pressure. When the pressure is lower than the set value, the frequency of the blower 13 slowly decreases, and when the pressure is higher than the set value, the frequency of the blower 13 gradually increases.

[0032] The sewage pump 2 and the level gauge 3 are interlocked. When the liquid level in the absorption tower 6 is higher than the set pressure, the sewage pump 2 starts to transport the liquid in the tower to the next process.

[0033] The alkali solution in the alkali tank 14 is used as the absorbent and is transported to the absorption tower 6 by the alkali replenishment pump 17. The alkali replenishment pump inlet valve 15 is normally open. When the outside temperature is above zero, the alkali return valve 16 is normally closed. The automatic alkali replenishment valve 18 is interlocked with the pH meter 19 and the level gauge 3. When the pH value of the absorbent 6-1 is lower than the set value, alkali is automatically replenished. When the level of the absorbent 6-1 is lower than the lower limit of the set value, alkali is automatically replenished.

[0034] The usage process of this utility model is as follows:

[0035] Acid mist containing VOCs enters the absorption tower 6 from top to bottom through the dynamic wave feed pipe 6-5. The circulating pump 1 transports the liquid in the absorption tower 6 to the dynamic wave feed pipe 6-5 and discharges it through the dynamic wave nozzle 6-4. The liquid rises from bottom to top, forming a gas-liquid two-phase zone. At this time, the liquid and gas collide with each other, and the acid mist dissolves in the absorbent liquid. The gas enters the tower body 6-2 of the absorption tower 6. The absorbent liquid 6-1 is evenly distributed on the packing 6-9 by the spiral nozzle 6-8 inside the tower body 6-2. When the gas passes through the packing 6-9 of the absorption tower, the acid mist is further absorbed. An acid mist adsorption device 11 is installed from the outlet of the absorption tower 6 to the inlet of the fan 13. As a safety measure, the acid mist containing VOCs continues to be absorbed by the skid-mounted activated carbon 11-3. Thus, one round of acid mist absorption operation is completed.

Claims

1. A VOCs-containing acid mist absorption system, characterized in that, include: The absorption tower (6) is equipped with a circulation pump (1) and a sewage pump (2) connected to it on its side. The absorption tower (6) is equipped with a level gauge (3), a second pressure monitoring gauge (9) and a pH meter (19). The circulation pump (1) is connected to the power wave regulating valve (4) and the spray regulating valve (5) respectively. The first pressure monitoring gauge (7) is installed on the pipeline between the power wave regulating valve (4) and the absorption tower (6). The absorption tower (6) is equipped with an acid mist pipeline (8) at the inlet. An acid mist adsorption device (11) is connected to an absorption tower (6), and a third pressure gauge (10) is installed on the pipeline between the two. A fan (13) is connected to an acid mist adsorption device (11), and a fourth pressure gauge (12) is installed on the pipeline between the two. The alkali tank (14) is connected to the absorption tower (6) via the alkali replenishment pump (17). An alkali replenishment pump inlet valve (15) is provided on the pipeline between the alkali tank (14) and the alkali replenishment pump (17). An automatic alkali replenishment valve (18) is provided on the pipeline between the alkali replenishment pump (17) and the absorption tower (6). An alkali reflux valve (16) is provided on the pipeline between the alkali tank (14) and the absorption tower (6). The alkali reflux valve (16) and the alkali replenishment pump (17) are connected in parallel.

2. A VOCs-containing acid mist absorption system according to claim 1, characterized in that, The absorption tower (6) includes a tower body (6-2), and inside the tower body (6-2) are arranged from top to bottom a foam trap (6-6), a spraying liquid pipe (6-7), a packing (6-9) and an absorbent liquid (6-1). The side of the tower body (6-2) is provided with a dynamic wave feed pipe (6-5), and the two are connected by a dynamic wave transition section (6-3). The dynamic wave feed pipe (6-5) is provided with a dynamic wave nozzle (6-4).

3. A VOCs-containing acid mist absorption system according to claim 1, wherein The acid mist adsorption device (11) includes an acid mist adsorption device housing (11-1), in which a skid-mounted activated carbon (11-3) is provided inside and an activated carbon addition port (11-2) is provided on the outer wall.

4. A VOCs containing acid mist absorption system according to claim 2, wherein The bottom of the spray pipe (6-7) is provided with several spiral nozzles (6-8) arranged in parallel.

5. A VOCs containing acid mist absorption system according to claim 1, wherein The fan (13) and the second pressure monitoring gauge (9) are interlocked.

6. A VOCs containing acid mist absorption system according to claim 1, wherein The sewage pump (2) and the level gauge (3) are interlocked.

7. A VOCs containing acid mist absorption system as claimed in claim 1 wherein, The automatic alkali replenishment valve (18) is interlocked with the pH meter (19) and the level gauge (3).

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