Tail gas absorption device in process of extracting salt from desulfurization waste liquid
By improving the Pall ring structure to a combination of a ceramic inner ring and a PP outer ring, and combining it with a two-stage wet spraying process, the problem of easy deformation of the PP Pall ring was solved, thereby improving the mass transfer efficiency and purification effect of the exhaust gas absorption device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG ZHIXIN ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
- Filing Date
- 2024-10-29
- Publication Date
- 2026-05-08
AI Technical Summary
Existing PP Pall rings are prone to deformation in exhaust gas absorption devices, resulting in reduced mass transfer efficiency, poor gas-liquid contact, and increased system energy consumption.
A composite Pall ring structure combining a ceramic inner ring and a PP outer ring is adopted to enhance the rigidity of the Pall ring. Combined with a two-stage wet spray structure, the design of the spray pipe and spray nozzle ensures full contact and mixing of gas and liquid.
It improves mass transfer efficiency and exhaust gas absorption efficiency, avoids Pall ring deformation, reduces system energy consumption, and achieves efficient exhaust gas purification.
Smart Images
Figure CN224207746U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of waste gas treatment technology, specifically to a tail gas absorption device in the process of salt extraction from desulfurization waste liquid. Background Technology
[0002] The exhaust gas generated during the desulfurization wastewater salt extraction and recovery process mainly contains the following components: hydrogen sulfide, sulfur dioxide, ammonia, and particulate matter such as dust. Among them, hydrogen sulfide is a toxic gas with an irritating odor, sulfur dioxide is harmful to the environment and human health, and ammonia has an irritating odor and is irritating to the respiratory tract.
[0003] Therefore, in order to ensure the comfort of workshop personnel and meet environmental protection requirements, the exhaust gas from some equipment that cannot be fully enclosed during the production process needs to be concentrated and absorbed.
[0004] Currently, the most mainstream method for treating exhaust gases is absorption. Alkaline absorption utilizes alkaline solutions such as sodium hydroxide and calcium hydroxide to absorb acidic gases like hydrogen sulfide and sulfur dioxide from the exhaust gases, causing a chemical reaction that produces salts. Reaction equations include: H₂S + 2NaOH → Na₂S + 2H₂O; SO₂ + 2NaOH → Na₂SO₃ + H₂O.
[0005] Oxidation absorption uses oxidants such as sodium hypochlorite and hydrogen peroxide to oxidize reducing gases like hydrogen sulfide in the exhaust gas into harmless substances like sulfate, which are then absorbed by an alkaline solution. For example, H₂S + NaClO → S↓ + NaCl + H₂O, and the generated elemental sulfur can be recovered and reused.
[0006] In order to improve the mixing efficiency between the exhaust gas and the absorption solvent, most of the existing spray towers used in the absorption method adopt a packing layer. The packing layer is filled with a large number of Pall rings or Raschig rings, which greatly improves the mass transfer efficiency. Among them, the mass transfer efficiency of Pall rings can be 20-40% higher than that of Raschig rings.
[0007] Existing Pall rings used in absorption spray towers are made of PP material to avoid acid and alkali corrosion. However, because PP is relatively soft, it is easily deformed under pressure when used in the packing layer. Once deformed, the gas-liquid contact effect of the PP Pall ring deteriorates. The originally regular packing layer structure is disrupted, the gas-liquid flow path is altered, and insufficient gas-liquid contact may occur, reducing mass transfer efficiency. Furthermore, deformed Pall rings may increase fluid resistance, leading to a higher pressure drop within the spray tower and increased system energy consumption. Utility Model Content
[0008] To address the existing technical problems, this utility model aims to provide a tail gas absorption device in the desulfurization wastewater salt extraction process. By improving the structure of the Pall ring and increasing its rigidity, it replaces the original PP Pall ring and is applied to the spray device for tail gas absorption. This solves the problem of reduced mass transfer efficiency caused by Pall ring deformation, allowing the liquid in the tail gas absorption device to be fully mixed with the acidic or alkaline gases in the tail gas, thereby enhancing the absorption efficiency.
[0009] To achieve the above objectives, this utility model provides the following technical solution:
[0010] A tail gas absorption device for the salt extraction process of desulfurization wastewater includes:
[0011] Collection tower, spray system and packing layer;
[0012] The collection tower is cylindrical in shape, with an air inlet at the top and an air outlet in the middle.
[0013] The spraying system is installed on the collection tower. The spraying system includes a water tank, a spray pump, and a spray pipe. The water tank is located on the outer bottom of the collection tower and is connected to the interior of the collection tower. The water tank is also connected to the spray pump. The spray pipe is connected to the spray pump and extends from the spray pump into the interior of the collection tower. The portion of the spray pipe located inside the collection tower is provided with several spray nozzles.
[0014] The packing layer is disposed below the spray pipe. The packing layer includes a packing support grid and Pall rings. The packing support grid is horizontally fixed inside the collection tower. The Pall rings are laid flat on top of the packing support grid. The Pall rings include an outer ring and an inner ring. The outer ring is flexibly disposed, and the inner ring is rigidly disposed. The inner ring is inserted into the outer ring, and the inner ring and the outer ring are interference-fitted.
[0015] As an improvement, the outer ring includes two sets of interlocking and integrally formed rings, each ring comprising a circular ring and a plurality of hollow pillars. Adjacent hollow pillars form windows between the two sets of parallel circular rings, and the hollow pillars have notches.
[0016] As an improvement, the inner ring is provided in two sets, each corresponding to the ring body. Each inner ring includes an annular seat, a column, and a tongue. The column is arranged in a circumferentially equidistant array around the central axis of the annular seat. The column and the hollow column are interlocked. The tongue corresponds to the column and is integrally formed. The tongue is arc-shaped and extends from the notch toward the central axis of the annular seat.
[0017] As an improvement, the ring corresponding to the annular seat is provided with a flange, and the ring covers the annular seat.
[0018] As an improvement, the spray pipes are provided in two sets, with the two sets of spray pipes arranged at different heights. Correspondingly, the packing layer is provided in two sets, with the bottom packing layer located above the air outlet.
[0019] As an improvement, the collection tower is provided with several transparent observation windows, through which the interior of the collection tower can be observed.
[0020] As an improvement, a ladder railing is provided on the outer wall of the collection tower.
[0021] As an improvement, a filter screen is provided in the middle of the water tank, and a water inlet and a drain outlet are provided on the other side of the water tank opposite to the spray pump.
[0022] As an improvement, an inspection door is provided on the top of the water tank, which is located directly above the filter screen, and the filter screen can be pulled out and installed.
[0023] The beneficial effects of this utility model are as follows:
[0024] (1) This utility model improves the structure of the Pall ring, enhances the rigidity of the Pall ring, replaces the original PP Pall ring, and applies it to the spray device for exhaust gas absorption, thereby solving the problem of reduced mass transfer efficiency caused by Pall ring deformation, so that the liquid in the exhaust gas absorption device is fully mixed with the acidic or alkaline gas in the exhaust gas, and the absorption efficiency is enhanced.
[0025] (2) This utility model utilizes the combination of an outer ring made of PP and an inner ring made of ceramic to form a Pall ring. The ceramic inner ring supports the PP outer ring to prevent the PP outer ring from deforming. At the same time, the tongue formed by the ceramic inner ring cooperates with the window on the PP outer ring to further improve the mass transfer efficiency. The resulting composite Pall ring has the advantages of the PP Pall ring and also has a certain rigidity support, making it less prone to deformation.
[0026] (3) This utility model adopts a two-stage wet spray structure and spray washing method to remove alkaline gas in the tail gas. Spray pipes are installed in the spray absorption tower and spray nozzles are installed on the spray pipes. The arrangement of the spray nozzles ensures that the cross section of the spray slurry within the effective spray distance is free of dead angles, so as to achieve the most ideal contact area and method and fully absorb, dissolve and react.
[0027] In summary, this invention has higher mass transfer efficiency and high tail gas absorption efficiency, and is particularly suitable for the field of tail gas absorption technology in the process of salt extraction from desulfurization waste liquid. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the three-dimensional structure of the collection tower of this utility model. Figure 1 ;
[0029] Figure 2 This is a schematic diagram of the three-dimensional structure of the collection tower of this utility model. Figure 2 ;
[0030] Figure 3 This is a schematic cross-sectional view of the collection tower of this utility model;
[0031] Figure 4 This is a partial schematic diagram of the internal structure of the collection tower of this utility model;
[0032] Figure 5 This is a schematic diagram of the three-dimensional structure of the Pall ring of this utility model;
[0033] Figure 6 This is a schematic diagram of the explosive structure of the Pall ring of this utility model;
[0034] Figure 7 This is a schematic diagram of the three-dimensional structure of the outer ring of this utility model;
[0035] Figure 8 This is a schematic diagram of the three-dimensional structure of the inner ring of this utility model;
[0036] Figure 9 This is a schematic diagram of the connection structure between the water tank and the collection tower of this utility model;
[0037] Figure 10 This is a schematic diagram of the internal structure of the water tank of this utility model;
[0038] Figure 11 This is a three-dimensional structural diagram of the filter screen of this utility model.
[0039] The attached diagram includes the following labels: Collection tower 1, Air inlet 11, Air outlet 12, Transparent observation window 13, Ladder railing 14, Spray system 2, Water tank 21, Filter screen 211, Water inlet 212, Sewage outlet 213, Inspection door 214, Slide rail 215, Spray pump 22, Spray pipe 23, Spray nozzle 231, Packing layer 3, Packing support grid 31, Pall ring 32, Outer ring 321, Ring body 3211, Circular ring 32111, Hollow column 32112, Window 32113, Notch 32114, Inner ring 322, Circular seat 3221, Column 3222, Tongue 3223. Detailed Implementation
[0040] 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.
[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0043] Example 1:
[0044] like Figures 1-8 As shown, a tail gas absorption device for the desulfurization wastewater salt extraction process includes:
[0045] Collection tower 1, spray system 2, and packing layer 3;
[0046] The collection tower 1 is cylindrical in shape, with an air inlet 11 at the top and an air outlet 12 in the middle.
[0047] The spray system 2 is installed on the collection tower 1. The spray system 2 includes a water tank 21, a spray pump 22, and a spray pipe 23. The water tank 21 is installed on the bottom outside of the collection tower 1 and is connected to the interior of the collection tower 1. The water tank 21 is also connected to the spray pump 22. The spray pipe 23 is connected to the spray pump 22 and extends from the spray pump 22 into the interior of the collection tower 1. The portion of the spray pipe 23 located inside the collection tower 1 is provided with a plurality of spray nozzles 231.
[0048] The packing layer 3 is disposed below the spray pipe 23. The packing layer 3 includes a packing support grid 31 and a Pall ring 32. The packing support grid 31 is horizontally fixedly installed inside the collection tower 1. The Pall ring 32 is laid flat on top of the packing support grid 31. The Pall ring 32 includes an outer ring 321 and an inner ring 322. The outer ring 321 is flexibly made of PP, and the inner ring 322 is rigidly made of ceramic. The inner ring 322 is inserted into the outer ring 321, and the inner ring 322 and the outer ring 321 are interference-fitted.
[0049] Specifically, the outer ring 321 includes two sets of interlaced and integrally formed ring bodies 3211. Each ring body 3211 includes a circular ring 32111 and a plurality of hollow pillars 32112. Adjacent hollow pillars 32112 form windows 32113 between the two sets of parallel circular rings 32111, and the hollow pillars 32112 are provided with notches 32114.
[0050] Furthermore, two sets of inner rings 322 are provided, each corresponding to a ring body 3211. Each inner ring 322 includes an annular seat 3221, a column 3222, and a tongue 3223. The columns 3222 are arranged in a circumferentially equidistant array around the central axis of the annular seat 3221. The columns 3222 and the hollow column 32112 are interlocked and fitted. The tongues 3223 correspond one-to-one with the columns 3222 and are integrally formed. The tongues 3223 are arc-shaped and extend from the notch 32114 toward the central axis of the annular seat 3221.
[0051] Furthermore, the ring 32111 corresponding to the annular seat 3221 is provided with a flange, and the ring 32111 covers the annular seat 3221, thereby protecting the annular seat 3221.
[0052] Specifically, the difference between the composite Pall ring of this application and the PP Pall ring is that the outer ring 321 of this application is still made of PP material, which has the advantages of PP material. At the same time, the inner ring 322 is made of ceramic material. The inner ring 322 provides strong support for the outer ring 321, and the outer ring 321 protects the inner ring 322. The two work together to make the formed composite Pall ring have both strong rigidity and strong mass transfer rate.
[0053] When used in combination, the outer ring 321 and the inner ring 322 are simply interlocked. Assembly can be achieved through the interlocking of the hollow column 32112 and the upright column 3222. Since the diameter of the upright column 3222 is slightly larger than the central hole diameter of the hollow column 32112, the outer ring 321 is not easy to fall off after interlocking, and the structure is stable.
[0054] It should be noted that during the desalination process, the generated waste gas enters the collection tower 1 through the inlet 11. Then, the spray pipes 23 in the spray system 2 begin spraying a chemical solution to initially absorb the main pollutants in the exhaust gas, such as hydrogen sulfide and sulfur dioxide. The chemical solution sprayed from the spray system 2 mixes with the exhaust gas at the packing layer 3. Due to the structure of the Pall rings 32, the gas can flow through the pores and windows of the Pall rings, while the liquid can form a thin film on the surface of the Pall rings, thus greatly increasing the gas-liquid contact area. Simultaneously, when the gas and liquid come into contact with the Pall rings in the spray tower, the special structure of the Pall rings generates strong turbulence and disturbance. This turbulence and disturbance promotes thorough mixing of the gas and liquid, allowing the pollutants in the gas to be more effectively absorbed by the liquid.
[0055] In addition, in the spray system 2, after the chemical solution sprayed by the spray pipe 23 drips to the bottom of the collection tower 1, it returns to the water tank 21 through the connection between the collection tower 1 and the water tank 21, and is then circulated back to the spray pipe 23 by the spray pump 22, so that the chemical solution is utilized to the maximum extent.
[0056] Example 2:
[0057] Referring to Example 1, the difference between Example 2 and Example 1 lies in the following:
[0058] like Figure 4 As shown, there are two sets of spray pipes 23, which are arranged at different heights. Correspondingly, there are two sets of packing layers 3, with the bottom packing layer 3 located above the air outlet 12.
[0059] The collection tower 1 is provided with several transparent observation windows 13, through which the interior of the collection tower 1 can be observed.
[0060] Furthermore, a ladder railing 14 is provided on the outer wall of the collection tower 1.
[0061] It should be noted that this application employs a two-stage wet exhaust gas treatment process, using two different liquid absorbents to treat the exhaust gas. In the first stage, a specific chemical solution is typically used to initially absorb the main pollutants in the exhaust gas, such as hydrogen sulfide and sulfur dioxide. After the first stage, some pollutants in the exhaust gas are removed, but some harmful substances that have not been completely absorbed may still remain. At this point, the exhaust gas enters the second stage, where another absorbent is used to further remove the remaining pollutants, achieving a higher purification effect.
[0062] Common primary absorbents include alkaline solutions such as sodium hydroxide and calcium hydroxide. These solutions can neutralize acidic gases such as hydrogen sulfide and sulfur dioxide, converting them into salts.
[0063] The secondary absorbent is typically a solution with higher absorption efficiency and selectivity, such as organic amine solutions or hydrogen peroxide. Organic amine solutions can form relatively stable compounds with sulfur dioxide, thus achieving efficient absorption. Hydrogen peroxide can oxidize sulfur dioxide to sulfate ions, further improving the purification effect.
[0064] Furthermore, the absorbent in each stage is sprayed through two spray pipes, and the gas-liquid contact rate is increased by using Pall rings in the packing layer.
[0065] In addition, secondary wet treatment usually requires two collection towers, one for the first stage and one for the second stage. The collection towers are generally in the form of packed towers or spray towers to increase the gas-liquid contact area and improve the absorption efficiency.
[0066] Example 3:
[0067] Referring to Example 1, the difference between Example 3 and Example 1 lies in the following:
[0068] like Figures 9-11 As shown, a filter screen 211 is provided in the middle of the water tank 21, and a water inlet 212 and a drain outlet 213 are provided on the other side of the water tank 21 opposite to the spray pump 22. The water inlet 212 is used to input chemical solvents, and the drain outlet 213 is used to discharge stains.
[0069] Furthermore, the top of the water tank 21 is provided with an inspection door 214, which is located directly above the filter screen 211, and the filter screen 211 is designed for easy removal and installation.
[0070] It should be noted that, in order to prevent impurities from entering the spray pump 22 and causing damage to the spray pump 22, a filter screen 211 is also installed in the water tank 21 to filter the circulating chemical agents. At the same time, after the filter screen 211 has been working for a period of time, the filter screen 211 can be pulled out by opening the maintenance door 214 and then cleaned.
[0071] Furthermore, a vertical slide rail 215 is provided inside the water tank 21. The filter screen 211 can be installed by inserting it into the slide rail 215. The entire inspection and maintenance process is quick and convenient.
[0072] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A tail gas absorption device for the salt extraction process of desulfurization wastewater, characterized in that, include: Collection tower (1), spray system (2) and packing layer (3); The collection tower (1) is cylindrical in shape. The top of the collection tower (1) is provided with an air inlet (11), and the middle part of the collection tower (1) is provided with an air outlet (12). The spray system (2) is installed on the collection tower (1). The spray system (2) includes a water tank (21), a spray pump (22) and a spray pipe (23). The water tank (21) is installed on the bottom outside of the collection tower (1). The water tank (21) is connected to the inside of the collection tower (1) and the water tank (21) is connected to the spray pump (22). The spray pipe (23) is connected to the spray pump (22). The spray pipe (23) extends from the spray pump (22) to the inside of the collection tower (1), and the part of the spray pipe (23) located inside the collection tower (1) is provided with a plurality of spray nozzles (231). The packing layer (3) is disposed below the spray pipe (23). The packing layer (3) includes a packing support grid (31) and a Pall ring (32). The packing support grid (31) is horizontally fixed inside the collection tower (1). The Pall ring (32) is laid flat above the packing support grid (31). The Pall ring (32) includes an outer ring (321) and an inner ring (322). The outer ring (321) is flexibly disposed, and the inner ring (322) is rigidly disposed. The inner ring (322) is inserted into the outer ring (321), and the inner ring (322) and the outer ring (321) are interference-fitted.
2. The tail gas absorption device in the desulfurization wastewater salt extraction process according to claim 1, characterized in that: The outer ring (321) includes two sets of interlocking and integrally formed ring bodies (3211), each ring body (3211) including a circular ring (32111) and a plurality of hollow columns (32112). The adjacent hollow columns (32112) form windows (32113) between the two sets of parallel circular rings (32111), and the hollow columns (32112) have notches (32114).
3. The tail gas absorption device in the desulfurization wastewater salt extraction process according to claim 2, characterized in that: Two sets of inner rings (322) are provided, each corresponding to the ring body (3211). Each inner ring (322) includes an annular seat (3221), a column (3222), and a tongue (3223). The column (3222) is arranged in a circumferential array around the central axis of the annular seat (3221). The column (3222) is inserted into the hollow column (32112). The tongue (3223) corresponds to the column (3222) and is integrally formed. The tongue (3223) is arc-shaped and extends out from the notch (32114) toward the central axis of the annular seat (3221).
4. The tail gas absorption device in the desulfurization wastewater salt extraction process according to claim 3, characterized in that: The ring (32111) corresponding to the annular seat (3221) is provided with a flange, and the ring (32111) covers the annular seat (3221).
5. The tail gas absorption device in the desulfurization wastewater salt extraction process according to claim 1, characterized in that: The spray pipe (23) is provided in two sets, and the two sets of spray pipe (23) are arranged at different heights. Correspondingly, the packing layer (3) is provided in two sets, and the bottom packing layer (3) is located above the air outlet (12).
6. The tail gas absorption device in the desulfurization wastewater salt extraction process according to claim 1, characterized in that: The collection tower (1) is provided with several transparent observation windows (13) through which the interior of the collection tower (1) can be observed.
7. The tail gas absorption device in the desulfurization wastewater salt extraction process according to claim 1, characterized in that: The outer wall of the collection tower (1) is equipped with a ladder railing (14).
8. The tail gas absorption device in the desulfurization wastewater salt extraction process according to claim 1, characterized in that: A filter screen (211) is provided in the middle of the water tank (21), and a water inlet (212) and a sewage outlet (213) are provided on the other side of the water tank (21) relative to the spray pump (22).
9. The tail gas absorption device in the desulfurization wastewater salt extraction process according to claim 8, characterized in that: The water tank (21) is provided with an inspection door (214) on the top, which is located directly above the filter screen (211). The filter screen (211) can be pulled out and installed.