A high-efficiency hydrogen sulfide waste gas purification device

Abstract

The utility model provides a kind of efficient hydrogen sulfide waste gas purification device, belong to industrial waste gas treatment technical field.The device includes filter tower, alkali washing spray tower, first fan and second fan.First filter screen and second filter screen are equipped in filter tower, top gas outlet connects tee, tee one end connects first fan, other end connects second fan;Second fan is sent into alkali washing spray tower after filtering and carries out desulfurization treatment.Waste water outlet in alkali washing spray tower bottom is connected with liquid storage tank by diaphragm pump and bag filter, realizes alkali liquor recycling.Liquid storage tank supplies liquid to first and second spray branch pipes in tower by circulating pump and spray main pipe.The utility model is through double-tower cooperation, effectively prevent nozzle blockage, improve desulfurization efficiency, and is applicable to the treatment of sulfur-containing waste gas.

Description

Technical Field

[0001] This utility model belongs to the field of industrial waste gas treatment technology, specifically relating to a high-efficiency hydrogen sulfide waste gas purification device. Background Technology

[0002] In industrial production processes, waste gas containing hydrogen sulfide (H2S) is widely present in industries such as wastewater treatment, biogas production, petrochemical refining, and papermaking. H2S not only has a strong odor but is also corrosive and toxic; direct emissions will seriously pollute the environment and endanger human health.

[0003] Currently, commonly used H2S removal methods include dry adsorption (such as activated carbon and iron oxide), wet chemical absorption (such as alkaline scrubbing), and biological desulfurization. Among these, alkaline scrubbing towers are widely used due to their simple operation and low cost. However, existing equipment generally suffers from the following problems: lack of a pretreatment unit, allowing dust-laden exhaust gas to directly enter the scrubbing tower, easily clogging nozzles and packing layers with dust particles; traditional nozzles are few in number and concentrated in distribution, resulting in uneven droplet coverage, small gas-liquid contact area, and low reaction efficiency; low alkaline utilization rate: waste alkaline solution is usually discharged directly without treatment, still containing a certain amount of active alkaline components, causing chemical waste and increasing the burden on subsequent wastewater treatment.

[0004] Therefore, developing a hydrogen sulfide waste gas purification device that integrates pretreatment, multi-stage absorption and alkaline solution recycling has become one of the problems that urgently need to be solved by those skilled in the art. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a high-efficiency hydrogen sulfide waste gas purification device. By setting up a dual-tower synergistic structure consisting of a filter tower and an alkaline scrubbing tower, and constructing an alkaline solution recycling system, it effectively realizes the graded treatment of waste gas and the reuse of alkali solution, solving the problems of dust-laden waste gas carrying dust particles that easily clog nozzles, low desulfurization efficiency, and poor alkaline solution utilization rate in existing technologies.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows: A high-efficiency hydrogen sulfide waste gas purification device includes a filter tower, an alkaline scrubbing tower, a first fan, and a second fan. The filter tower contains a second filter screen and a first filter screen arranged from top to bottom. An air inlet is located on one side of the lower part of the filter tower, and an air outlet is located at the top, with a T-junction fixedly connected to the outlet. One end of the T-junction is connected to the air outlet of the first fan via an air inlet pipe, and the other end is connected to the air inlet of the second fan via an air outlet pipe. The air outlet of the second fan is connected to the air inlet of the alkaline scrubbing tower via an air inlet pipe. A drain outlet is located on one side of the lower part of the alkaline scrubbing tower. The drain outlet is connected to the inlet of the diaphragm pump via the first liquid guide pipe. The outlet of the diaphragm pump is connected to the inlet of the bag filter via the second liquid guide pipe. The outlet of the bag filter is connected to the inlet of the storage tank via the third liquid guide pipe. The outlet of the storage tank is connected to the circulation pump via the main spray pipe. The main spray pipe is provided with a second spray branch pipe and a first spray branch pipe from top to bottom. The first spray branch pipe and the second spray branch pipe are both horizontally inserted through the side wall of the alkaline washing spray tower and extend inward into the inner cavity of the tower, for conveying alkaline spray absorption liquid into the tower.

[0007] Furthermore, the filter tower includes a cylindrical body with a conical top cover that is narrower at the top and wider at the bottom, and an air outlet at the top of the top cover; and a conical base that is wider at the top and narrower at the bottom, with a slag discharge pipe at the bottom of the conical base.

[0008] Furthermore, a first switch control valve is provided on the air inlet pipe, and a second switch control valve is provided on the air outlet pipe; both the air inlet and the slag discharge pipe are provided with switch control valves.

[0009] Furthermore, the circulating pump is located below the first spray branch pipe; the alkaline washing spray tower is provided with a second packing layer and a first packing layer from top to bottom; the second packing layer is located below the second spray branch pipe and above the first spray branch pipe; the first packing layer is located below the first spray branch pipe and above the air inlet of the alkaline washing spray tower.

[0010] Furthermore, both the end of the first spray branch pipe and the end of the second spray branch pipe are connected to a distributor; the distributor connected to the first spray branch pipe is circumferentially evenly provided with multiple sets of first spray branch pipes, and multiple first spray nozzles are installed at equal intervals on each set of first spray branch pipes; the distributor connected to the second spray branch pipe is circumferentially evenly provided with multiple sets of second spray branch pipes, and multiple second spray nozzles are installed at equal intervals on each set of second spray branch pipes.

[0011] Furthermore, the first filler layer includes a first filler and a first grid plate, wherein the first filler is supported by the first grid plate; the second filler layer includes a second filler and a second grid plate, wherein the second filler is supported by the second grid plate.

[0012] Furthermore, the top of the alkaline washing spray tower is provided with an air outlet, and a demisting layer is provided between the air outlet and the second spray branch pipe.

[0013] Furthermore, a motor is installed at the center of the top cover of the liquid storage tank, and the output end of the motor is connected to a stirring shaft through a coupling. The stirring shaft passes through the top cover of the liquid storage tank and extends into its interior, and multiple stirring rods are installed on the stirring shaft.

[0014] Furthermore, a pH meter is installed on the top cover of the storage tank; the detection probe of the pH meter extends into the storage tank and is located below the surface of the alkaline reagent solution, and is positioned close to the inlet and away from the stirring rod; the display screen of the pH meter is located on the top cover of the storage tank.

[0015] Furthermore, a liquid replenishment port is installed on the top cover of the liquid storage tank.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) This utility model is equipped with a filter tower and an alkaline scrubbing tower, which work together to form a graded purification system. The filter tower is used to remove dust particles carried in hydrogen sulfide waste gas. After the waste gas enters the filter tower through the inlet, it is intercepted by the first filter screen and the second filter screen in sequence, effectively removing solid impurities with larger particle sizes and preventing them from entering the subsequent alkaline scrubbing tower and causing nozzle or packing layer blockage, thus ensuring the stable operation of the system. In addition, the pretreated gas enters the alkaline scrubbing tower, which is equipped with a second packing layer and a first packing layer from top to bottom, and forms a multi-stage countercurrent absorption structure with the first spray branch pipe and the second spray branch pipe. The alkaline absorption liquid is sprayed downward from the spray branch pipe, and the waste gas flows from bottom to top to achieve full gas-liquid contact. On the surface of the packing, alkaline reagents such as NaOH react with H2S in an acid-base neutralization reaction, which significantly reduces the H2S concentration in the waste gas and ensures the safety and cleanliness of the emitted gas.

[0017] (2) The waste alkaline liquid after use is collected at the bottom of the alkaline washing spray tower, and enters the diaphragm pump through the first liquid guide pipe through the drain outlet. The diaphragm pump then transports the liquid to the bag filter through the second liquid guide pipe to remove the Na2S precipitate and other suspended solids generated by the reaction. The filtered clean liquid flows back to the storage tank through the third liquid guide pipe, and then re-enters the spray system through the circulation pump, realizing the closed-loop recycling of alkaline liquid and greatly reducing chemical consumption and wastewater discharge.

[0018] (3) The storage tank of this utility model is equipped with a pH meter on the top, the probe of which is submerged below the liquid surface. When the pH is lower than the set lower limit (e.g., pH < 9.0), fresh alkali solution is added to the storage tank through the replenishment port; when the pH is higher than the upper limit (e.g., pH > 12.0), clean water is added to adjust the concentration. In addition, the storage tank is also equipped with a stirring and mixing device, including a motor, a stirring shaft and multiple stirring rods, which can be operated periodically or continuously to ensure uniform composition of alkali solution and further improve the stability and efficiency of desulfurization reaction. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the alkaline washing spray tower structure of this utility model; Figure 3 This is a schematic diagram of the liquid storage tank structure of this utility model; In the diagram: 1. Filter tower, 11. Tee, 12. Air inlet pipe, 121. First switch control valve, 13. Air outlet pipe, 131. Second switch control valve, 14. Second filter screen, 15. First filter screen, 16. Air inlet, 17. Slag discharge pipe, 2. Alkali washing spray tower, 21. Air outlet, 22. Demisting layer, 23. First packing layer, 231. First packing material, 232. First grating plate, 24. Second packing layer, 241. Second packing material, 242. Second grating plate, 25. Air inlet pipe, 26. First liquid guide pipe, 27. Second liquid guide pipe, 28. Third liquid guide pipe, 29. Main spray pipe, 291. First spray branch pipe, 292. Second spray branch pipe, 293. First spray sub-pipe, 294. First spray nozzle, 295. Second spray sub-pipe, 296. Second spray nozzle, 3. First fan, 4. Second fan, 5. Diaphragm pump, 6. Bag filter, 7. Liquid storage tank, 71. pH meter, 72 motor, 73 stirring shaft, 74 stirring rod, 75 replenishment port, 8 circulating pump, 9 transparent window. Detailed Implementation

[0020] 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.

[0021] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The circuits, electronic components, and modules involved in this utility model are all prior art, and those skilled in the art can fully implement them.

[0023] This utility model provides a high-efficiency hydrogen sulfide waste gas purification device. The technical solution of this utility model will be further described below with reference to the accompanying drawings: See Figure 1 As can be seen, the high-efficiency hydrogen sulfide waste gas purification device provided by this utility model includes a filter tower 1, an alkaline scrubbing spray tower 2, a first fan 3, a second fan 4, a diaphragm pump 5, a bag filter 6, a liquid storage tank 7, and a circulating pump 8; the filter tower 1 is provided with a second filter screen 14 and a first filter screen 15 from top to bottom. The filter holes of the first filter screen 15 are smaller than those of the second filter screen 14, which is used to intercept dust particles in the H2S-containing waste gas step by step to prevent them from entering the subsequent equipment and causing blockage; the filter tower 1 is provided with an air inlet 16 on one side of the lower part and an air outlet at the top. The air outlet is fixedly connected to a tee 11; one end of the tee 11 is connected to the air outlet of the first fan 3 through an air inlet pipe 12, and a first switch control valve 121 is provided on the air inlet pipe 12; the other end of the tee 11 is connected to the air inlet of the second fan 4 through an air outlet pipe 13, and a second switch control valve 131 is provided on the air outlet pipe 13.

[0024] During normal purification operation, the first switch valve 121 is closed, the second switch valve 131 is opened, and the second fan 4 is started. The exhaust gas containing H2S enters the filter tower 1 through the inlet 16, and after being filtered by the first filter screen 15 and the second filter screen 14, it enters the tee 11 through the top outlet, and is then transported to the alkaline washing spray tower 2 for deep desulfurization treatment through the outlet pipe 13 and the second fan 4.

[0025] When the filter screen needs cleaning, stop supplying exhaust gas to the filter tower 1, close the second switch valve 131, open the first switch valve 121, and start the first fan 3. At this time, the airflow generated by the first fan 3 is blown in reverse from the top of the filter tower 1 through the air inlet pipe 12, back-blowing the first filter screen 15 and the second filter screen 14, causing the attached dust particles to fall off and settle to the bottom of the conical base, and finally be discharged out of the tower through the slag discharge pipe 17, thus achieving dust removal and extending the service life of the filter screen.

[0026] In the above embodiment, the air outlet of the second fan 4 is connected to the air inlet of the alkaline washing spray tower 2 via the air inlet pipe 25; a drain outlet is provided on one side of the lower part of the alkaline washing spray tower 2, which is connected to the liquid inlet of the diaphragm pump 5 via the first liquid guide pipe 26, the liquid outlet of the diaphragm pump 5 is connected to the liquid inlet of the bag filter 6 via the second liquid guide pipe 27, and the liquid outlet of the bag filter 6 is connected to the liquid inlet of the storage tank 7 via the third liquid guide pipe 28; the liquid outlet of the storage tank 7 is connected to the circulation pump 8 via the spray main pipe 29.

[0027] After use, the waste alkali solution enters the diaphragm pump 5 from the bottom drain of the alkali washing spray tower 2 through the first liquid guide pipe 26. The diaphragm pump 5 then transports the solution to the bag filter 6 through the second liquid guide pipe 27 to remove the Na2S precipitate and suspended impurities generated in the reaction. The filtered clean liquid flows back to the storage tank 7 through the third liquid guide pipe 28, and then through the circulation pump 8 to realize the recycling of the alkali solution.

[0028] The filter tower 1 includes a cylindrical body with a conical top cover that is narrower at the top and wider at the bottom, and an air outlet at the top of the top cover; a conical base that is wider at the top and narrower at the bottom, and a slag discharge pipe 17 at the bottom of the conical base; both the air inlet 16 and the slag discharge pipe 17 are equipped with on / off control valves. The side wall of the alkaline washing spray tower 2 is provided with at least one transparent window 9, preferably made of a corrosion-resistant transparent material (such as polycarbonate PC or quartz glass).

[0029] See Figure 1 and Figure 2 As can be seen from the above embodiment, the main spray pipe 29 is provided with a second spray branch pipe 292 and a first spray branch pipe 291 from top to bottom. Both the first spray branch pipe 291 and the second spray branch pipe 292 are horizontally inserted through the side wall of the alkaline washing spray tower 2 and extend inward into the inner cavity of the tower body for conveying alkaline spray liquid into the tower. The alkaline washing spray tower 2 is provided with an air outlet 21, a demister layer 22, a second spray branch pipe 292, a second packing layer 24, a first spray branch pipe 291, and a first packing layer 23 from top to bottom.

[0030] In the above embodiment, both the first spray branch pipe 291 and the second spray branch pipe 292 are connected to the circulating pump 8 through the main spray pipe 29; the end of the first spray branch pipe 291 is connected to a first distributor, which distributes multiple sets of first spray branch pipes 293 evenly around the circumference, and multiple first spray nozzles 294 are installed at equal intervals on each set of first spray branch pipes 293; the end of the second spray branch pipe 292 is connected to a second distributor, which distributes multiple sets of second spray branch pipes 295 evenly around the circumference, and multiple second spray nozzles 296 are installed at equal intervals on each set of second spray branch pipes 295.

[0031] In the above embodiment, the first packing layer 23 is located below the first spray branch pipe 291 and above the air inlet of the alkaline spray tower 2, and includes a first packing material 231 supported by the first grid plate 232; the second packing layer 24 is located below the second spray branch pipe 292 and above the first spray branch pipe 291, and includes a second packing material 241 supported by the second grid plate 242.

[0032] The connection between the aforementioned spray branch pipes and the side wall of the alkaline washing spray tower is equipped with a sealing structure (such as a flange or sealing sleeve) to prevent gas leakage. The first packing material 231 and the second packing material 241 can be Pall ring packing, providing a high specific surface area to enhance the reaction contact time between H2S and the alkaline spray liquid; the first grid plate 232 and the second grid plate 242 are used to fix the packing. The air outlet 21 at the top of the alkaline washing spray tower 2 is typically connected to the plant's main exhaust pipe through a corrosion-resistant exhaust pipe, discharging into the ambient air.

[0033] See Figure 1 and Figure 3 As can be seen from the above embodiment, a motor 72 is installed at the center of the top cover of the storage tank 7. The output end of the motor 72 is connected to a stirring shaft 73 via a coupling. The stirring shaft 73 passes through the top cover of the storage tank 7 and extends into its interior. Multiple stirring rods 74 are installed on the stirring shaft 73. A pH meter 71 is installed on the top cover of the storage tank 7. The detection probe of the pH meter 71 extends into the storage tank 7 and is located below the surface of the alkaline reagent solution, close to the inlet and away from the stirring rods 74. The display screen of the pH meter 71 is located on the top cover of the storage tank 7 for easy on-site reading. The top cover of the storage tank 7 is provided with a replenishment port. When the pH meter 71 detects that the pH of the alkaline solution is lower than the set lower limit (e.g., pH < 9.0), the replenishment port cover is opened to add fresh alkaline solution. When the pH of the alkaline solution is detected to be too high (e.g., pH > 12.0), the replenishment port cover is opened to add clean water.

[0034] The above provides a detailed description of the high-efficiency hydrogen sulfide waste gas purification device provided by this utility model. The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A high-efficiency hydrogen sulfide waste gas purification device, characterized in that, The system includes a filter tower (1), an alkaline washing spray tower (2), a first blower (3), and a second blower (4). The filter tower (1) has a second filter screen (14) and a first filter screen (15) arranged from top to bottom. The filter tower (1) has an air inlet (16) on one side of its lower part and an air outlet on its top, with a T-junction (11) fixedly connected to the outlet. One end of the T-junction (11) is connected to the air outlet of the first blower (3) via an air inlet pipe (12), and the other end is connected to the air inlet of the second blower (4) via an air outlet pipe (13). The air outlet of the second blower (4) is connected to the air inlet of the alkaline washing spray tower (2) via an air inlet pipe (25). The alkaline washing spray tower (2) has a drain outlet on one side of its lower part. The first liquid guide pipe (26) is connected to the inlet of the diaphragm pump (5), the outlet of the diaphragm pump (5) is connected to the inlet of the bag filter (6) via the second liquid guide pipe (27), and the outlet of the bag filter (6) is connected to the inlet of the storage tank (7) via the third liquid guide pipe (28); the outlet of the storage tank (7) is connected to the circulating pump (8) via the spray main pipe (29); the spray main pipe (29) is provided with a second spray branch pipe (292) and a first spray branch pipe (291) from top to bottom. The first spray branch pipe (291) and the second spray branch pipe (292) are both horizontally installed on the side wall of the alkaline washing spray tower (2) and extend inward into the inner cavity of the tower body for conveying alkaline spray liquid into the tower.

2. The high-efficiency hydrogen sulfide waste gas purification device according to claim 1, characterized in that, The filter tower (1) includes a cylindrical body with a conical top cover that is narrower at the top and wider at the bottom, and an air outlet at the top of the top cover; and a conical base that is wider at the top and narrower at the bottom, with a slag discharge pipe (17) at the bottom of the conical base.

3. The high-efficiency hydrogen sulfide waste gas purification device according to claim 2, characterized in that, The air inlet pipe (12) is provided with a first switch control valve (121), and the air outlet pipe (13) is provided with a second switch control valve (131); the air inlet (16) and the slag discharge pipe (17) are both provided with switch control valves.

4. The high-efficiency hydrogen sulfide waste gas purification device according to claim 1, characterized in that, The circulating pump (8) is located below the first spray branch pipe (291); the alkaline washing spray tower (2) is provided with a second packing layer (24) and a first packing layer (23) from top to bottom; the second packing layer (24) is located below the second spray branch pipe (292) and above the first spray branch pipe (291); the first packing layer (23) is located below the first spray branch pipe (291) and above the air inlet of the alkaline washing spray tower (2).

5. The high-efficiency hydrogen sulfide waste gas purification device according to claim 4, characterized in that, Both the end of the first spray branch pipe (291) and the end of the second spray branch pipe (292) are connected to a distributor; the distributor connected to the first spray branch pipe (291) is evenly provided with multiple sets of first spray branch pipes (293) in the circumference, and multiple first spray nozzles (294) are installed at equal intervals on each set of first spray branch pipes (293); the distributor connected to the second spray branch pipe (292) is evenly provided with multiple sets of second spray branch pipes (295) in the circumference, and multiple second spray nozzles (296) are installed at equal intervals on each set of second spray branch pipes (295).

6. The high-efficiency hydrogen sulfide waste gas purification device according to claim 4, characterized in that, The first filler layer (23) includes a first filler (231) and a first grid plate (232), wherein the first filler (231) is supported by the first grid plate (232); the second filler layer (24) includes a second filler (241) and a second grid plate (242), wherein the second filler (241) is supported by the second grid plate (242).

7. The high-efficiency hydrogen sulfide waste gas purification device according to claim 1, characterized in that, The top of the alkaline washing spray tower (2) is provided with an air outlet (21), and a demisting layer (22) is provided between the air outlet (21) and the second spray branch pipe (292).

8. The high-efficiency hydrogen sulfide waste gas purification device according to claim 1, characterized in that, A motor (72) is installed at the center of the top cover of the liquid storage tank (7). The output end of the motor (72) is connected to a stirring shaft (73) via a coupling. The stirring shaft (73) passes through the top cover of the liquid storage tank (7) and extends into its interior. Multiple stirring rods (74) are installed on the stirring shaft (73).

9. The high-efficiency hydrogen sulfide waste gas purification device according to claim 8, characterized in that, A pH meter (71) is installed on the top cover of the liquid storage tank (7); the detection probe of the pH meter (71) extends into the liquid storage tank (7) and is located below the liquid surface of the alkaline reagent solution, and is set close to the liquid inlet and away from the stirring rod (74); the display screen of the pH meter (71) is located on the top cover of the liquid storage tank (7).

10. The high-efficiency hydrogen sulfide waste gas purification device according to claim 8, characterized in that, The liquid storage tank (7) has a liquid replenishment port (75) installed on its top cover.

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