Sulfur-containing waste gas treatment device
By designing sulfur-containing waste gas treatment devices, including absorption towers, precipitation tanks and filter presses, the sulfur dioxide in the exhaust gas is treated with sodium hydroxide and calcium hydroxide aqueous solutions, the excessive load load of sewage treatment stations and the large amount of sodium hydroxide is solved. Problem, zero sewage emissions and cost reduction have been achieved.
Patent Information
- Application Number
- CN202420167897.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-23
- Publication Date
- 2024-12-06
- Estimated Expiration
- 2034-01-23
AI Technical Summary
The existing sulfur-containing waste gas treatment technology causes excessive workload of sewage treatment stations and is toxic to bacterial species, affecting the survival of bacterial species, and the use of sodium hydroxide aqueous solution is large, resulting in high treatment costs.
A sulfur-containing waste gas treatment device is designed, including an absorption tower, a precipitation tank and a filter press. It uses sodium hydroxide aqueous solution to absorb sulfur dioxide in the exhaust gas. The precipitation tank is used to cure sulfur elements, and the filter press is used to separate and recover sodium hydroxide. The aqueous solution is designed to improve the absorption effect of sodium hydroxide aqueous solution through the design of the circulation pipeline and pump, and the aqueous calcium hydroxide solution is added to the precipitation tank to form floc calcium sulfite, and the aqueous calcium sulfite and sodium hydroxide solution are separated by pressure filtration. Realize zero sewage emissions.
Reduced the use and treatment cost of sodium hydroxide aqueous solution, achieved zero sewage emissions, improved the utilization rate of calcium hydroxide aqueous solution, reduced the treatment cost of sulfur-containing waste gas, and reduced the atmospheric carbon dioxide to calcium hydroxide aqueous solution Consumption.
Smart Images
Figure CN222111404U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of chemical industry, in particular to a treatment device for sulfur-containing waste gas. Background Art
[0002] Chemical companies generate sulfur-containing waste gas during the production process, which needs to be treated and meet the standards before being discharged.
[0003] At present, sulfur-containing tail gas is usually treated with an absorption tower. The sulfur-containing tail gas is countercurrently contacted with a sodium hydroxide solution in the absorption tower. The sulfur dioxide therein reacts with the sodium hydroxide to form sodium sulfite. An absorption rich liquid containing sodium sulfite is obtained at the bottom of the absorption tower, and tail gas with sulfur content that meets the standard is obtained at the top of the absorption tower. The absorption rich liquid is recycled and partially discharged to a sewage treatment plant for treatment.
[0004] Since the absorbed rich liquid contains a high concentration of sodium sulfite and a large discharge volume, the workload of the sewage treatment plant is high, and it is toxic to the bacteria, affecting their survival. Summary of the invention
[0005] The utility model aims to provide a sulfur-containing waste gas treatment device in view of the deficiencies of the prior art, which has a simple structure and low transformation cost, and realizes zero sewage discharge while ensuring normal treatment of tail gas.
[0006] The technical scheme of the utility model is: a processing device for sulfur-containing waste gas, comprising an absorption tower, a sedimentation tank, and a filter press, wherein an air inlet is arranged on the lower side wall of the absorption tower and connected to a source of sulfur-containing waste gas, a spray device is arranged on the top of the absorption tower and connected to a source of sodium hydroxide aqueous solution, an upstream end of a circulation pipeline is connected to the bottom of the absorption tower, and a downstream end is connected to the spray device, a circulation pump is arranged on the circulation pipeline, a first inlet is arranged on the sedimentation tank and connected to the circulation pipeline, and is located upstream of the circulation pump, a second inlet is arranged and connected to a source of calcium hydroxide aqueous solution, a feed port of the filter press is connected to the sedimentation tank through a first pipeline, a feed pump is arranged on the first pipeline, a filtrate outlet of the filter press is connected to the circulation pipeline through a second pipeline, and is located downstream of the circulation pump.
[0007] The filter residue outlet of the filter press transports the solid waste to the outside through a solid waste conveyor belt.
[0008] The sedimentation tank is in a rectangular structure, the first inlet and the second inlet are located at the same end, and the upstream end of the first pipeline is connected to the other end of the sedimentation tank.
[0009] The sedimentation tank is closed by a cover.
[0010] The upstream end of the first pipeline is connected to the bottom of the sedimentation tank.
[0011] The above technical solution has the following beneficial effects:
[0012] 1. The treatment device for sulfur-containing waste gas includes an absorption tower, a sedimentation tank, and a filter press, wherein the absorption tower uses a sodium hydroxide aqueous solution to absorb sulfur dioxide in the tail gas, the sedimentation tank is used to solidify sulfur elements, and the filter press is used to separate and recover the sodium hydroxide aqueous solution. The lower side wall of the absorption tower is provided with an air inlet connected to the source of sulfur-containing waste gas, the top of the absorption tower is provided with a spray device connected to the source of sodium hydroxide aqueous solution, the upstream end of a circulation pipeline is connected to the bottom of the absorption tower, and the downstream end is connected to the spray device. A circulation pump is provided on the circulation pipeline, and the sodium hydroxide aqueous solution is countercurrently contacted with the sulfur-containing tail gas in the absorption tower, and the absorbed rich liquid obtained at the bottom of the absorption tower is returned to the spray device through the circulation pipeline for recycling, thereby improving the absorption effect of the sodium hydroxide aqueous solution, reducing the use of the sodium hydroxide aqueous solution, and thus reducing the cost of tail gas treatment. The sedimentation tank is provided with a first inlet connected to the circulation pipeline, located upstream of the circulation pump, and part of the absorbed rich liquid enters the sedimentation tank through the first inlet. A second inlet is provided to be connected to a source of calcium hydroxide aqueous solution, and the absorption rich solution entering the sedimentation tank is mixed with the added calcium hydroxide aqueous solution to generate flocculent calcium sulfite and sodium hydroxide aqueous solution. The feed port of the filter press is connected to the sedimentation tank through a first pipeline, and a feed pump is provided on the first pipeline. The filtrate outlet of the filter press is connected to the circulation pipeline through a second pipeline, and is located downstream of the circulation pump. The mixture obtained in the sedimentation tank is sent to the filter press, and the flocculent calcium sulfite therein is separated by filter pressing to obtain calcium sulfite precipitate. The filtrate separated by filter pressing is mainly sodium hydroxide aqueous solution, which is returned to the circulation pipeline and is located downstream of the circulation pump as a fresh absorption lean solution, so that the use of sodium hydroxide aqueous solution can be effectively reduced, and zero sewage discharge is achieved.
[0013] 2. The sedimentation tank has a rectangular structure, with the first inlet and the second inlet located at the same end. The upstream end of the first pipeline is connected to the other end of the sedimentation tank, so that the absorbed rich liquid and the calcium hydroxide aqueous solution are fully mixed, thereby improving the utilization rate of the calcium hydroxide aqueous solution and reducing the treatment cost of sulfur-containing waste gas.
[0014] 3. The sedimentation tank is closed by a cover to reduce the consumption of calcium hydroxide aqueous solution by carbon dioxide in the atmosphere, improve the utilization rate of calcium hydroxide aqueous solution, and reduce the treatment cost of sulfur-containing waste gas.
[0015] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a connection diagram of the utility model.
[0017] In the accompanying drawings, 1 is an absorption tower, 11 is an air inlet, 12 is a spray device, 2 is a sedimentation tank, 21 is a first inlet, 22 is a second inlet, 3 is a filter press, 4 is a circulation pipeline, 5 is a circulation pump, 6 is a first pipeline, 7 is a feed pump, and 8 is a second pipeline. DETAILED DESCRIPTION
[0018] See also Figure 1 , is a specific embodiment of a treatment device for sulfur-containing waste gas. The treatment device for sulfur-containing waste gas includes an absorption tower 1, a sedimentation tank 2, and a filter press 3. An air inlet 11 is arranged on the lower side wall of the absorption tower 1 and connected to a source of sulfur-containing waste gas. A spray device 12 is arranged on the top of the absorption tower 1 and connected to a source of sodium hydroxide aqueous solution. Usually, a filler is also required to be arranged below the spray device to improve the absorption effect of sulfur-containing waste gas. An upstream end of a circulation pipeline 4 is connected to the bottom of the absorption tower, and a downstream end is connected to the spray device 12. A circulation pump 5 is arranged on the circulation pipeline 4. The sedimentation tank 2 is provided with a first inlet 21 connected to the circulation pipeline 4, located upstream of the circulation pump 5, and a second inlet 22 is arranged to be connected to a source of calcium hydroxide aqueous solution. In this embodiment, the sedimentation tank 2 is a rectangular structure, and the first inlet 21 and the second inlet 22 are located at the same end. In order to reduce the consumption of calcium hydroxide aqueous solution by carbon dioxide in the atmosphere and improve the utilization rate of calcium hydroxide aqueous solution, the sedimentation tank 2 is closed by a cover. The feed port of the filter press 3 is connected to the other end of the sedimentation tank 2 through the first pipeline 6, and is connected to the bottom of the sedimentation tank 2. A feed pump 7 is arranged on the first pipeline 6. The filtrate outlet of the filter press 3 is connected to the circulation pipeline 4 through the second pipeline 8, and is located downstream of the circulation pump. The filter residue outlet of the filter press 3 transports solid waste to the outside through a solid waste conveyor belt.
[0019] The working principle of the utility model is as follows: sodium hydroxide aqueous solution enters from the top of the absorption tower through a spray device and forms a circulation through a circulation pipeline, sulfur-containing waste gas enters the lower part of the inner space of the absorption tower through the air inlet of the absorption tower, and contacts with the sodium hydroxide aqueous solution in the tower in countercurrent, and sulfur dioxide in the waste gas reacts with sodium hydroxide to generate sodium sulfite; part of the absorption rich liquid containing sodium sulfite enters the sedimentation tank through the first inlet, and calcium hydroxide aqueous solution is added through the second inlet at the same time, and the reaction generates flocculent calcium sulfite; the material in the sedimentation tank is pumped to the filter press through the first pipeline, and the filter residue obtained by the filter pressing is discharged to a designated position through the filter residue outlet and the solid waste conveyor belt for external sales, and the filtrate obtained by the filter pressing is returned to the circulation pipeline through the filtrate outlet and the second pipeline to be used as the absorption lean liquid.
Claims
1. A sulfur-containing waste gas treatment device, comprising an absorption tower (1), characterized in that: It also includes a sedimentation tank (2) and a filter press (3). The lower side wall of the absorption tower (1) is provided with an air inlet (11) connected to a source of sulfur-containing waste gas; the top of the absorption tower (1) is provided with a spray device (12) connected to a source of sodium hydroxide aqueous solution; the upstream end of a circulation pipeline (4) is connected to the bottom of the absorption tower, and the downstream end is connected to the spray device (12); a circulation pump (5) is provided on the circulation pipeline (4); The sedimentation tank (2) is provided with a first inlet (21) connected to the circulation pipeline (4) and located upstream of the circulation pump (5), and a second inlet (22) connected to a source of calcium hydroxide aqueous solution. The feed inlet of the filter press (3) is connected to the sedimentation tank (2) via a first pipeline (6), a feed pump (7) is arranged on the first pipeline (6), and the filtrate outlet of the filter press (3) is connected to the circulation pipeline (4) via a second pipeline (8), which is located downstream of the circulation pump.
2. The sulfur-containing waste gas treatment device according to claim 1, characterized in that: The filter residue outlet of the filter press (3) transports the solid waste to the outside via a solid waste conveyor belt.
3. The sulfur-containing waste gas treatment device according to claim 1, characterized in that: The sedimentation tank (2) has a rectangular structure, the first inlet (21) and the second inlet (22) are located at the same end, and the upstream end of the first pipeline (6) is connected to the other end of the sedimentation tank (2).
4. The sulfur-containing waste gas treatment device according to claim 1, characterized in that: The sedimentation tank (2) is closed by a cover.
5. The sulfur-containing waste gas treatment device according to claim 1, characterized in that: The upstream end of the first pipeline (6) is connected to the bottom of the sedimentation tank (2).