A waste gas desulfurization treatment device

Abstract

The utility model relates to waste gas desulfurization technical field, especially waste gas desulfurization treatment device, including pretreatment box, desulfurization tank and storage tank, the bottom of pretreatment box is provided with air inlet pipe, the first filter screen, alkaline adsorption filler layer and demisting component are sequentially arranged from below to top in pretreatment box, the top of pretreatment box and the bottom end lateral wall of desulfurization tank are connected with the gas guide pipe, and the desulfurization filler layer, spray coil and activated carbon adsorption layer are sequentially arranged from below to top in desulfurization tank, a plurality of baffle plates are arranged in parallel in desulfurization filler layer, a plurality of atomizing nozzles are installed in the low end of spray coil, the top of desulfurization tank is provided with exhaust pipe, the bottom of desulfurization tank and the top of storage tank are provided with liquid outlet pipe, the second filter screen is inserted in storage tank, and the liquid guide pipe is connected between the bottom of storage tank and spray coil, the utility model makes desulfurizer and waste gas fully contact reaction in filler layer, and ensures that desulfurization is more thorough.

Description

Technical Field

[0001] This utility model relates to the field of waste gas desulfurization technology, and more specifically to a waste gas desulfurization treatment device. Background Technology

[0002] With the accelerating pace of industrialization, emissions of industrial waste gases containing sulfur oxides (SOx, especially SO2) are increasing daily, becoming a major contributing factor to environmental problems such as acid rain and smog. Therefore, desulfurization of industrial waste gases has become a crucial aspect of air pollution control.

[0003] Existing desulfurization devices mostly adopt wet desulfurization processes, which achieve desulfurization by spraying desulfurizing agents (such as calcium hydroxide solution) to react with waste gas. However, there are the following shortcomings: the desulfurizing agent does not come into sufficient contact with the waste gas, and some waste gas is discharged directly without participating in the reaction, resulting in low desulfurization efficiency; some unreacted absorbent is discharged with wastewater or waste residue, resulting in material waste. Utility Model Content

[0004] The purpose of this invention is to provide a waste gas desulfurization treatment device that allows the desulfurizing agent to fully contact and react with the waste gas, avoids the discharge of unreacted desulfurizing agent with the waste residue, and reduces the consumption of desulfurizing agent.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A waste gas desulfurization treatment device includes a pretreatment box, a desulfurization box, and a storage box. An air inlet pipe is installed at the bottom of the pretreatment box. From bottom to top, the pretreatment box contains a first filter screen, an alkaline adsorption packing layer, and a demisting component. A guide pipe connects the top of the pretreatment box and the bottom side wall of the desulfurization box, and an air pump is installed on the guide pipe. From bottom to top, the desulfurization box contains a desulfurization packing layer, a spray coil, and an activated carbon adsorption layer. Multiple sets of baffles are arranged parallel to each other within the desulfurization packing layer. Multiple atomizing nozzles are installed at the lower end of the spray coil. An exhaust pipe is installed at the top of the desulfurization box. A liquid outlet pipe is installed between the bottom of the desulfurization box and the top of the storage box, and a first solenoid valve is installed on the liquid outlet pipe. A second filter screen is inserted into the storage box. A liquid guide pipe connects the bottom of the storage box and the spray coil, and a liquid pump is installed on the liquid guide pipe.

[0007] Furthermore, the alkaline adsorption packing layer is composed of magnesium hydroxide particle packing.

[0008] Furthermore, the defogging assembly consists of multiple parallel defogging plates, and the cross-section of the defogging plates is wavy.

[0009] Furthermore, the desulfurization packing layer is composed of hollow spherical activated carbon.

[0010] Furthermore, a concentration sensor is installed inside the storage tank, a feeding pipe is provided at the top of the storage tank, a drain pipe is provided at the bottom of the storage tank, and a second solenoid valve is installed on the drain pipe.

[0011] Furthermore, a rotating shaft is rotatably installed inside the storage tank, the rotating shaft is located below the second filter screen, a stirring blade is fixedly connected to the rotating shaft, and a drive motor for driving the rotating shaft to rotate is installed on the outer wall of the storage tank.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This application uses baffles to change the flow trajectory of exhaust gas, extending the residence time of exhaust gas in the desulfurization packing layer. At the same time, the atomizing nozzles of the spray coil can evenly spray the desulfurizing agent, allowing the desulfurizing agent and exhaust gas to fully contact and react in the packing layer, ensuring more thorough desulfurization. The storage tank and the desulfurization tank form a closed loop through the liquid outlet pipe and the liquid guide pipe. The desulfurization liquid after reaction can flow back to the storage tank, filter impurities through the second filter screen, and then be transported back to the spray coil, preventing unreacted desulfurizing agent from being discharged with the waste residue and significantly reducing desulfurizing agent consumption. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] 1. Pretreatment box; 2. Desulfurization box; 3. Storage box; 4. Inlet pipe; 5. First filter screen; 6. Alkaline adsorption packing layer; 7. Demisting assembly; 71. Demisting plate; 8. Air guide pipe; 9. Air pump; 10. Desulfurization packing layer; 11. Spray coil; 12. Activated carbon adsorption layer; 13. Baffle plate; 14. Atomizing nozzle; 15. Exhaust pipe; 16. Liquid outlet pipe; 17. First solenoid valve; 18. Second filter screen; 19. Liquid guide pipe; 20. Liquid pump; 21. Concentration sensor; 22. Feeding pipe; 23. Drain pipe; 24. Second solenoid valve; 25. Rotating shaft; 26. Stirring blade; 27. Drive motor. Detailed Implementation

[0016] like Figure 1As shown, a waste gas desulfurization treatment device includes a pretreatment tank 1, a desulfurization tank 2, and a storage tank 3. An air inlet pipe 4 is installed at the bottom of the pretreatment tank 1. Inside the pretreatment tank 1, from bottom to top, a first filter screen 5, an alkaline adsorption packing layer 6, and a demister assembly 7 are arranged sequentially. A guide pipe 8 connects the top of the pretreatment tank 1 and the bottom side wall of the desulfurization tank 2. An air pump 9 is installed on the guide pipe 8. Inside the desulfurization tank 2, from bottom to top, a desulfurization packing layer 10, a spray coil 11, and an activated carbon adsorption layer 12 are arranged sequentially. Multiple sets of baffles 13 are arranged in parallel within the desulfurization packing layer 10. Multiple atomizing nozzles 14 are installed at the lower end of the spray coil 11. An exhaust pipe 15 is provided at the top of the desulfurization box 2. An outlet pipe 16 is provided between the bottom of the desulfurization box 2 and the top of the storage box 3. A first solenoid valve 17 is installed on the outlet pipe 16. A second filter screen 18 is inserted into the storage box 3. A liquid guide pipe 19 is connected between the bottom of the storage box 3 and the spray coil 11. A liquid pump 20 is installed on the liquid guide pipe 19.

[0017] The alkaline adsorption packing layer 6 is composed of magnesium hydroxide granular packing. The magnesium hydroxide granular packing can specifically adsorb Cl- and F- in the waste gas, without reacting with SO2, thus preventing Cl- and F- in the waste gas from entering the pretreatment box 1 and consuming subsequent desulfurizing agent, thereby reducing the desulfurization efficiency of the desulfurizing agent.

[0018] The demisting component 7 is composed of multiple parallel demisting plates 71, and the cross-section of the demisting plate 71 is wavy. The wavy demisting plate 71 can effectively increase the collision area, improve the demisting and dehydration efficiency, avoid water vapor diluting the desulfurizing agent, and ensure the desulfurization efficiency.

[0019] The desulfurization packing layer 10 is composed of hollow spherical activated carbon. On the one hand, the hollow spherical activated carbon adsorbs some of the SO2 in the waste gas, initially reducing the sulfur content; on the other hand, the hollow structure disperses the airflow, avoiding concentrated short-circuiting of the airflow; at the same time, the surface pores can temporarily store desulfurizing agent droplets, prolonging the reaction time and improving the desulfurization efficiency.

[0020] A concentration sensor 21 is installed inside the storage tank 3. A feeding pipe 22 is installed on the top of the storage tank 3, and a drain pipe 23 is installed on the bottom of the storage tank 3. A second solenoid valve 24 is installed on the drain pipe 23. The concentration sensor 21 can detect the concentration of desulfurizing agent (such as calcium hydroxide concentration) in the storage tank 3 in real time. When the concentration is lower than the set threshold, new desulfurizing agent can be added in time through the feeding pipe 22 to avoid a sudden drop in desulfurization efficiency due to insufficient desulfurizing agent activity. The combination of the drain pipe 23 and the second solenoid valve 24 can periodically discharge the aged desulfurizing liquid that has accumulated impurities and whose concentration cannot be restored by feeding during long-term circulation, preventing the aged liquid from clogging the atomizing nozzle 14 or reducing the reaction activity. At the same time, when the machine is shut down for maintenance, the residual liquid in the tank can be emptied through the drain pipe 23 to facilitate the cleaning of impurities attached to the tank wall. This solves the problem of "blindly adding desulfurizing agent or not replacing it due to lack of concentration monitoring, and the aging of circulating liquid affecting the desulfurization effect" and ensures the continuous and stable operation of the device.

[0021] A rotating shaft 25 is rotatably installed inside the storage tank 3. The rotating shaft 25 is located below the second filter screen 18. A stirring blade 26 is fixedly connected to the rotating shaft 25. A drive motor 27 is installed on the outer wall of the storage tank 3 to drive the rotating shaft 25 to rotate. The drive motor 27 drives the rotating shaft 25 and the stirring blade 26 to rotate, which can prevent the desulfurization liquid in the storage tank from stratifying due to standing (such as unreacted desulfurizing agent particles settling down) and ensure that the concentration of desulfurizing agent is uniform.

[0022] Working principle:

[0023] Sulfur-containing waste gas enters the pretreatment box 1 through the inlet pipe 4, first passing through the first filter screen 5 to filter dust; then it flows upward through the alkaline adsorption packing layer 6, where magnesium hydroxide particles adsorb Cl- and F- in the waste gas; finally, it passes through the corrugated demister plate 71 to remove water vapor. The pretreated clean waste gas, under the action of the air pump 9, enters the bottom of the desulfurization box 2 through the air guide pipe 8. The clean waste gas enters the desulfurization box 2 from bottom to top, and is guided through the desulfurization packing layer 10 by the baffle plate 13; at the same time, the desulfurizing agent (25% calcium hydroxide solution) in the storage box 3 is driven by the liquid pump 20 and transported to the spray coil 11 through the liquid guide pipe 19. After being atomized by the atomizing nozzle 14, it is sprayed downward, making full contact with the waste gas in the desulfurization packing layer 10 and reacting; after desulfurization, the waste gas flows upward through the activated carbon adsorption layer 12 to remove residual trace amounts of SO2, and is finally discharged through the exhaust pipe 15.

[0024] After the reaction, the desulfurization liquid (containing unreacted calcium hydroxide and calcium sulfate) flows into the storage tank 3 through the outlet pipe 16 (with the first solenoid valve 17 open) under the action of gravity. After the calcium sulfate solid impurities are filtered out by the second filter screen 18, the remaining desulfurizing agent continues to participate in the circulation. When the concentration of desulfurizing agent in the storage tank 3 decreases, new desulfurizing agent can be added through the feeding pipe 22 to ensure stable circulation.

[0025] This invention improves desulfurization efficiency by pre-treating and purifying waste gas, extending contact time with baffles, and uniformly spraying with atomizing nozzles; it also improves the utilization rate of unreacted desulfurizing agents through a closed-loop circulation design of the desulfurization liquid.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A waste gas desulfurization treatment device, characterized in that: The system includes a pretreatment tank (1), a desulfurization tank (2), and a storage tank (3). An air inlet pipe (4) is installed at the bottom of the pretreatment tank (1). From bottom to top, the pretreatment tank (1) contains a first filter screen (5), an alkaline adsorption packing layer (6), and a demisting assembly (7). A guide pipe (8) connects the top of the pretreatment tank (1) to the bottom side wall of the desulfurization tank (2). An air pump (9) is installed on the guide pipe (8). From bottom to top, the desulfurization tank (2) contains a desulfurization packing layer (10), a spray coil (11), and an activated carbon adsorption layer (12). The desulfurization packing layer (10)... 10) Multiple sets of baffles (13) are arranged in parallel inside. Multiple atomizing nozzles (14) are installed at the lower end of the spray coil (11). An exhaust pipe (15) is provided at the top of the desulfurization box (2). An outlet pipe (16) is provided between the bottom of the desulfurization box (2) and the top of the storage box (3). A first solenoid valve (17) is installed on the outlet pipe (16). A second filter screen (18) is inserted in the storage box (3). A liquid guide pipe (19) is connected between the bottom of the storage box (3) and the spray coil (11). A liquid pump (20) is installed on the liquid guide pipe (19).

2. The waste gas desulfurization treatment device as described in claim 1, characterized in that: The alkaline adsorption packing layer (6) is composed of magnesium hydroxide particle packing.

3. The waste gas desulfurization treatment device as described in claim 1, characterized in that: The defogging assembly (7) consists of multiple parallel defogging plates (71), and the cross-section of the defogging plates (71) is wavy.

4. The waste gas desulfurization treatment device as described in claim 1, characterized in that: The desulfurization packing layer (10) is composed of hollow spherical activated carbon.

5. The waste gas desulfurization treatment device as described in claim 1, characterized in that: A concentration sensor (21) is installed inside the storage tank (3). A feeding pipe (22) is provided on the top of the storage tank (3). A drain pipe (23) is provided at the bottom of the storage tank (3). A second solenoid valve (24) is installed on the drain pipe (23).

6. The waste gas desulfurization treatment device as described in claim 1, characterized in that: A rotating shaft (25) is rotatably installed inside the storage tank (3). The rotating shaft (25) is located below the second filter screen (18). A stirring blade (26) is fixedly connected to the rotating shaft (25). A drive motor (27) for driving the rotating shaft (25) to rotate is installed on the outer wall of the storage tank (3).

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