A circulating liquid renewable self-cleaning type alkaline spray waste gas treatment system

Abstract

This invention relates to a self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid, comprising a spray tower and a regeneration water tank. The spray tower has an exhaust port, several layers of packing material, an air inlet pipe, and an exhaust port from top to bottom. Each packing layer is equipped with a spray pipe for spraying alkaline solution. The air inlet pipe is used to input exhaust gas. The exhaust gas and alkaline solution react countercurrently, and the treated exhaust gas is discharged from the exhaust port. The exhaust port of the spray tower is connected to the inlet of the regeneration water tank for inputting the reacted alkaline solution into the regeneration water tank. The regeneration water tank is equipped with an aeration pipe for inputting oxygen. The oxygen reacts with the alkaline solution to obtain regenerated alkaline solution. The outlet of the regeneration water tank is connected to the spray pipe of the spray tower for inputting the regenerated alkaline solution into the spray tower for further treatment of exhaust gas.

Description

Technical Field

[0001] This invention belongs to the field of deodorization technology in wastewater treatment, specifically relating to a self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid. Background Technology

[0002] Odor control is an important part of the wastewater treatment field. When wastewater is stored or contained in tanks or equipment such as equalization tanks, primary sedimentation tanks, air flotation equipment, hydrolysis tanks, aerobic tanks, and sedimentation tanks for a long time, the wastewater will produce foul odors.

[0003] Currently, inverted membrane structures, fiberglass, and PC polycarbonate panels are used to enclose the pools or equipment. After enclosure, a dedicated deodorization fan, an alkaline spray tower, and a biological deodorization device are used to transport, treat, and discharge the waste gas from the enclosed space at high altitude. The H2S content in the waste gas from the enclosed pools or equipment is generally above 100 ppm. When passing through the alkaline spray tower, alkaline solution is consumed for the reaction, resulting in significant costs for the alkaline solution.

[0004] In addition, spray towers are generally filled with several layers of packing material to promote contact between waste gas and alkaline solution. However, after long-term operation, viscous substances formed by the reaction between waste gas and alkaline solution can easily adhere to the packing material, clogging it and reducing the waste gas treatment effect. Furthermore, the packing material cannot be automatically cleaned; the equipment must be shut down, the spray tower's inspection port opened, the internal packing material removed, the original packing material cleaned, and then refilled, which is time-consuming and labor-intensive. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid. This system can divert the alkaline solution from the spray tower to a regeneration tank for regeneration, and then return the regenerated alkaline solution to the spray tower for further exhaust gas treatment. The spray tower contains several layers of packing material, which can move between different layers to achieve friction cleaning; alternatively, the size of the packing layers can be reduced to increase the flow rate of gas and liquid through the packing layers, thereby cleaning the packing material.

[0006] The self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid includes a spray tower and a regeneration water tank. The spray tower is provided with an exhaust port, several layers of packing material, an air inlet pipe, and an exhaust port from top to bottom. Each packing material layer is equipped with a spray pipe for spraying alkaline solution. The air inlet pipe is used to input exhaust gas. The exhaust gas and alkaline solution come into countercurrent contact and react. The treated exhaust gas is discharged from the exhaust port. The exhaust port of the spray tower is connected to the inlet of the regeneration water tank for inputting the reacted alkaline solution into the regeneration water tank.

[0007] The reclaimed water tank is equipped with an aeration pipe for introducing oxygen. The oxygen reacts with the alkali solution to obtain reclaimed alkali solution. The outlet of the reclaimed water tank is connected to the spray pipe of the spray tower to introduce the reclaimed alkali solution into the spray tower for further treatment of waste gas.

[0008] Optionally, the spray tower includes an exhaust zone, a treatment zone and a waste liquid zone from top to bottom. A demister is provided between the exhaust zone and the treatment zone to demist the waste gas after it has been treated in the treatment zone, and the waste gas is discharged from the spray tower after demisting.

[0009] The air inlet pipe is provided between the treatment area and the waste liquid area. The packing layer and spray pipe are provided in the treatment area. The waste gas comes into contact with and reacts with the alkaline solution sprayed from the spray pipe in the treatment area to remove H2S from the waste gas.

[0010] The drain outlet is located at the bottom of the waste liquid area. The alkaline solution after the waste gas is treated accumulates in the waste liquid area and is then discharged into the regeneration water tank.

[0011] Optionally, the regenerated water tank includes an upper reaction zone and a lower slag discharge zone. The water inlet of the regenerated water tank is located at the lower part of the reaction zone, the aeration pipe is located at the bottom of the reaction zone, and the bottom of the slag discharge zone is provided with a slag discharge port for discharging the elemental sulfur precipitate generated by the regeneration reaction.

[0012] Optionally, the outlet of the regenerated water tank is first connected to a self-cleaning filter, and then to a spray pipe. The self-cleaning filter can filter out elemental sulfur in the regenerated alkali solution, preventing elemental sulfur from entering and clogging the spray pipe.

[0013] To address the self-cleaning issue of the packing material inside the spray tower and extend its operating cycle, this invention provides the following two solutions. Optionally, the inner diameter of the spray tower corresponding to the packing layer is smaller than the inner diameter of the spray tower without a corresponding packing layer. A support platform is provided between the outer edge of the packing layer and the inner wall of the corresponding spray tower. The outer side of the support platform is fixed to the inner wall of the spray tower, while the inner side protrudes into the spray tower and connects to the support frame of the packing layer.

[0014] Optionally, the filler layer comprises several layers of inclined support mesh from top to bottom, and the filler in the same filler layer moves from top to bottom between different support meshes; an upward channel and a downward channel are provided between two adjacent filler layers;

[0015] The spray tower has a square cross-section and a square support net. The two sides of the support net are detachably connected to the two side walls of the spray tower. The other two side walls of the spray tower are respectively provided with the rising channel and the falling channel.

[0016] One side of the support net of the lowest layer of the upper filler layer is connected to the top of the descending channel, and the bottom of the descending channel is connected to one side of the support net of the highest layer of the lower filler layer, which is used to transfer the filler from the upper filler layer to the lower filler layer; one side of the support net of the highest layer of the upper filler layer is connected to the top of the ascending channel, and the bottom of the ascending channel is connected to one side of the support net of the lowest layer of the lower filler layer, which is used to transfer the filler from the lower filler layer to the upper filler layer.

[0017] Optionally, the spray tower includes side one, side two, side three, and side four in a clockwise direction, and the outer edge of the support net includes side one, side two, side three, and side four in a clockwise direction.

[0018] The area of ​​the side corresponding to the packing layer is provided with a movable sidewall. The side of the support net is detachably connected to the side. When the packing needs to be replaced, the movable sidewall can be pulled outward, and the support net is pulled out of the spray tower along with the movable sidewall.

[0019] Alternatively, the same packing layer may have a closed mesh on one side of its own support mesh, a closed mesh on one side of its own support mesh, a closed mesh on one side of its own support mesh, and a closed mesh on one side of its own support mesh, so that when the support mesh is pulled out, the packing inside is intercepted by the three closed meshes and the movable sidewalls and will not fall into the spray tower.

[0020] Further optionally, the packing layers in the processing area are arranged in pairs, and the rising channel and the falling channel are provided between the pair (i.e., two) packing layers; in the pair of packing layers, the packing layer at the top is the upper packing layer, and the packing layer at the bottom is the lower packing layer.

[0021] Further optionally, the descent channel is located on side four, and the length of the descent channel is equal to the distance between side one and side three. The descent channel is enclosed by a fence to form a closed space, allowing the filler to descend in the space between the fence and side four.

[0022] The top of the fence is connected to the side of the lowest support net of the upper filler layer. The distance between the closed net and the corresponding side is not less than the thickness of the descent channel. The bottom of the closed net of the upper filler layer is provided with an openable first gate, which allows the filler on the last support net to enter the descent channel.

[0023] Further optionally, the ascending channel is located on side two and includes two circulating tracks and several transport troughs. The circulating tracks are square, and the two circulating tracks are at the same height and are arranged horizontally side by side on side two.

[0024] The transport trough consists of two detachable sections, each of which is connected to a circulating track by a slider; the length of the transport trough is less than the distance between side one and side three. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid.

[0026] Figure 2 This is a schematic diagram of the cross-section of the spray tower;

[0027] Figure 3 This is a schematic diagram showing the coordination between the upper and lower packing layers and the rising and falling channels;

[0028] Figure 4 This is a schematic diagram of a circular track;

[0029] Figure 5 This is a schematic diagram showing the material transport status of the transport trough;

[0030] Figure 6 A schematic diagram showing the material being unloaded from the transport trough;

[0031] Figure 7 This is a schematic diagram showing the connection between the movable sidewall and the spray tower.

[0032] In the attached diagram, 1-spray tower, 2-reclaimed water tank, 3-exhaust port, 4-packing layer, 5-air inlet pipe, 6-drain outlet, 7-spray pipe, 8-aeration pipe, 9-demister, 10-reaction zone, 11-slag discharge zone, 12-slag discharge port, 13-pH meter, 14-dissolved oxygen detector, 15-self-cleaning filter, 16-support platform, 17-support net, 18-rising channel, 19-falling channel, 20-upper packing layer, 21-lower packing layer, 22-side view 1, 23-side view 2, 24-side view 2. - Side 3, 25- Side 4, 26- Side 1, 27- Side 2, 28- Side 3, 29- Side 4, 30- Movable sidewall, 31- Enclosed net 2, 32- Enclosed net 3, 33- Enclosed net 4, 34- Fence net, 35- Inclined plate, 36- Transport trough, 37- Dividing trough, 38- Bottom horizontal track, 39- Top horizontal track, 40- First gate, 41- Second gate, 42- Sliding block, 43- Support rod, 44- Telescopic rod, 45- First sealing step, 46- Second sealing step. Detailed Implementation

[0033] This embodiment provides a self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid, such as... Figures 1-7 As shown, the system includes a spray tower 1 and a regenerated water tank 2. The spray tower 1 has an exhaust port 3, several layers of packing material 4, an air inlet pipe 5, and an exhaust port 6 from top to bottom. Each packing material layer 4 is equipped with a spray pipe 7 above it for spraying alkaline solution. The air inlet pipe 5 is used to input waste gas. The waste gas and alkaline solution come into countercurrent contact and react. The treated waste gas is discharged from the exhaust port 3. The exhaust port 6 of the spray tower 1 is connected to the inlet of the regenerated water tank 2 for inputting the reacted alkaline solution into the regenerated water tank 2.

[0034] The regenerated water tank 2 is equipped with an aeration pipe 8 for introducing oxygen. The oxygen reacts with the alkali solution to obtain regenerated alkali solution. The outlet of the regenerated water tank 2 is connected to a spray pipe 7 for introducing the regenerated alkali solution into the spray tower 1 for further treatment of waste gas.

[0035] Optionally, the spray tower 1 includes an exhaust zone, a treatment zone and a waste liquid zone from top to bottom. A demister 9 is provided between the exhaust zone and the treatment zone to demist the waste gas after it has been treated in the treatment zone. The waste gas is then discharged from the spray tower 1 after demisting.

[0036] The air inlet pipe 5 is provided between the treatment area and the waste liquid area. The packing layer 4 and spray pipe 7 are provided in the treatment area. The waste gas comes into contact with and reacts with the alkaline solution sprayed from the spray pipe 7 in the treatment area to remove H2S from the waste gas.

[0037] The drain outlet 6 is located at the bottom of the waste liquid area. The alkaline solution after the waste gas is treated accumulates in the waste liquid area and is then discharged into the regenerated water tank 2.

[0038] Further optionally, the spray pipes 7 are evenly distributed on the cross-section above the filler layer 4, so that the alkaline solution is evenly sprayed on the filler layer 4.

[0039] The inlet of the spray pipe 7 passes through the side wall of the spray tower 1 and is connected in parallel to the outlet of the regenerated water tank 2 and the alkali tank through a pipe. The alkali tank contains fresh alkali sodium carbonate solution. The spray pipe 7 can use fresh alkali solution and / or regenerated alkali solution.

[0040] Alternatively, the air inlet pipes 5 are evenly distributed across the cross-section of the treatment zone, so that the exhaust gas enters the spray tower 1 evenly.

[0041] This invention uses sodium carbonate solution instead of traditional sodium hydroxide solution, which reacts with hydrogen sulfide in the waste gas within the treatment zone as follows:

[0042] Na₂CO₃ + 2H₂S → NaHS + NaHCO₃

[0043] The reacted liquid enters the waste liquid area and is then fed into the reclaimed water tank, where the following reaction occurs in the presence of oxygen:

[0044]

[0045]

[0046]

[0047] A catalyst, PDS, is added to the reclaimed water tank to carry out the above reaction. PDS is a mixture of phthalocyanine cobalt sulfonate compounds, with its main component being dinuclear phthalocyanine cobalt sulfonate. The reaction conditions are ambient temperature and pressure, with the mixture stirred while oxygen is provided. The reclaimed alkali solution, mainly sodium hydroxide, reacts with hydrogen sulfide in the spray tower to produce NaHS and / or Na2S, which enters the reclaimed water tank as waste liquid. There, it can undergo the above reaction with oxygen again to obtain reclaimed alkali solution, thus completing the cycle.

[0048] Optionally, the regenerated water tank 2 includes an upper reaction zone 10 and a lower slag discharge zone. The water inlet of the regenerated water tank 2 is located at the lower part of the reaction zone 10, the aeration pipe 8 is located at the bottom of the reaction zone 10, and the bottom of the slag discharge zone is provided with a slag discharge port 12 for discharging the elemental sulfur precipitate generated by the regeneration reaction.

[0049] Optionally, the reaction zone 10 is equipped with a pH meter 13 and a dissolved oxygen detector 14 to monitor the liquid environment of the reaction zone 10 in real time and ensure the regeneration reaction proceeds.

[0050] The aeration pipe 8 is connected to an external air supply device via an air pipe.

[0051] Optionally, the outlet of the regenerated water tank 2 is first connected to a self-cleaning filter 15, and then to a spray pipe 7. The self-cleaning filter 15 can filter and remove elemental sulfur from the regenerated alkali solution, preventing elemental sulfur from entering and clogging the spray pipe 7.

[0052] To address the self-cleaning issue of the packing material inside the spray tower 1 and extend its operating cycle, this invention provides the following two solutions. Optionally, the inner diameter of the spray tower 1 corresponding to the packing layer 4 is smaller than the inner diameter of the spray tower 1 not corresponding to the packing layer 4. A support platform 16 is provided between the outer edge of the packing layer 4 and the inner wall of the corresponding spray tower 1. The outer side of the support platform 16 is fixed to the inner wall of the spray tower 1, and the inner side protrudes into the spray tower 1 and connects to the support frame of the packing layer 4.

[0053] The reduced tower inner diameter at packing layer 4 increases the relative velocity of the rising exhaust gas and descending alkali solution as they pass through it. This impacts and scrubs the packing material, achieving self-cleaning and preventing the accumulation of viscous deposits, thus delaying packing replacement. The reduced inner diameter at packing layer 4 directly decreases the amount of packing material used, potentially affecting the contact efficiency between the alkali solution and exhaust gas. Furthermore, the increased gas-liquid velocity at packing layer 4 reduces the gas-liquid contact time.

[0054] Optionally, the filler layer 4 includes several layers of inclined support mesh 17 from top to bottom, and the filler in the same filler layer 4 moves from top to bottom between different support meshes 17; an upward channel 18 and a downward channel 19 are provided between two adjacent filler layers;

[0055] The cross-section of the spray tower 1 and the support net 17 are both square. The two sides of the support net 17 are detachably connected to the two side walls of the spray tower. The other two side walls of the spray tower are respectively provided with the rising channel 18 and the falling channel 19.

[0056] One side of the support net of the lowest layer of the upper packing layer 20 is connected to the top of the descending channel 19, and the bottom of the descending channel 19 is connected to one side of the support net of the uppermost layer of the lower packing layer 21, for transferring the packing of the upper packing layer 20 to the lower packing layer 21; one side of the support net of the uppermost layer of the upper packing layer 20 is connected to the top of the ascending channel 18, and the bottom of the ascending channel 18 is connected to one side of the support net of the lowest layer of the lower packing layer 21, for transferring the packing of the lower packing layer 21 to the upper packing layer 20.

[0057] Further optionally, the spray tower includes side panel 22, side panel 23, side panel 24, and side panel 25 in a clockwise direction, and the outer edge of the support mesh includes side panel 26, side panel 27, side panel 28, and side panel 29 in a clockwise direction.

[0058] The area of ​​the side 22 corresponding to the packing layer is provided with a movable sidewall 30. The side 26 of the support net is detachably connected to the side 22. When the packing needs to be replaced, the movable sidewall 30 can be pulled outward, and the support net is pulled out of the spray tower along with the movable sidewall 30.

[0059] Alternatively, the same packing layer may have a closed mesh 31 on one side of its own support mesh 27, a closed mesh 32 on one side of its own support mesh 28, and a closed mesh 33 on one side of its own support mesh 29, so that when the support mesh is pulled out, the packing inside is intercepted by the three closed meshes and the movable sidewall 30 and will not fall into the spray tower.

[0060] Optionally, the area of ​​the side wall 324 corresponding to the packing layer is provided with several uniformly arranged protrusions. The protrusions protrude into the spray tower and can be of various geometric shapes. When the movable side wall 30 is sealed and the support net is inside the spray tower, the side edge 328 of the support net is close to the side wall 324, and the protrusions extend into the mesh of the closed net 32 ​​to provide support for the packing layer.

[0061] Further optionally, the packing layers in the processing area are arranged in pairs, with the rising channel 18 and the falling channel 19 provided between the pair (i.e., two) packing layers; in the pair of packing layers, the upper packing layer is the upper packing layer 20, and the lower packing layer is the lower packing layer 21.

[0062] Further optionally, the support mesh of the odd-numbered layers of the upper filler layer 20 is inclined from side 23 to side 425, that is, side 27 is higher than side 429, side 27 is fixed on the closed mesh 231, side 429 is suspended, and there is a gap between side 429 and closed mesh 433 to allow the filler to pass through.

[0063] The even-numbered support nets of the upper filler layer 20 are inclined from side 4 25 to side 2 23, that is, side 4 29 is higher than side 2 27. Side 4 29 is fixed on the closed net 4 33, and side 2 27 is suspended. There is a gap between side 2 27 and closed net 2 31, which allows the filler to pass through. This allows the filler in the same filler layer to roll down along the inclined support net, that is, it is in a rolling state. The number of support nets in the upper filler layer 20 is odd.

[0064] Further optionally, the support mesh of the odd-numbered layers of the lower filler layer 21 is inclined from side four 25 to side two 23, that is, side four 29 is higher than side two 27, side four 29 is fixed on the closed mesh four 33, side two 27 is suspended, and there is a gap between side two 27 and closed mesh two 31 to allow the filler to pass through.

[0065] The even-numbered support nets of the lower filler layer 21 are inclined from side 23 to side 425, that is, side 27 is higher than side 429. Side 27 is fixed on the closed net 31, and side 429 is suspended. There is a gap between side 429 and closed net 33, which allows the filler to pass through, so that the filler in the same filler layer can roll down along the inclined support net, that is, it is in a rolling state; the number of support nets in the lower filler layer 21 is odd.

[0066] Further optionally, the descending channel 19 is provided on side four 25, and the length of the descending channel 19 is equal to the distance between side one 22 and side three 24. The descending channel 19 uses a fence net 34 to enclose the area of ​​side four 25 corresponding to the descending channel 19, forming a closed space, allowing the filler to descend in the space between the fence net 34 and side four 25.

[0067] The top of the fence net 34 is connected to the side 29 of the lowest support net of the upper filling layer 20. The distance between the closed net 33 and the corresponding side 25 is not less than the thickness of the descending channel 19. The bottom of the closed net 33 of the upper filling layer 20 is provided with an openable first gate 40, which allows the filling material on the last support net to enter the interior of the descending channel 19. That is, the first gate 40 corresponds to the part between the penultimate and penultimate support nets of the upper filling layer 20. The length of the first gate 40 is equal to the distance between the side 22 and the side 24.

[0068] The bottom end of the descending channel 19 is provided with an inclined plate 35. The beginning end of the inclined plate 35 is fixed to the side 25, and the end end is connected to the side 29 of the uppermost support net of the lower filling layer 21. The beginning end is higher than the end end, so that the filling material of the descending channel 19 enters the lower filling layer 21. No fence net 34 is set at the height of the descending channel 19 where the inclined plate 35 is installed, so as not to affect the descent of the filling material.

[0069] Further optionally, the ascending channel 18 is provided on the second side 23 and includes two circulating tracks and several transport troughs 36. The circulating tracks are square, and the two circulating tracks are at the same height and are arranged horizontally side by side on the second side 23.

[0070] The transport trough 36 includes two detachable troughs 37, each of which is slidably connected to a circulating track via a slider 42; the length of the transport trough 36 is less than the distance between side 1 22 and side 3 24.

[0071] Optionally, the distance between the second closed net 31 and the corresponding second side 23 is not less than the thickness of the transport trough 36, allowing the transport trough 36 to move between the upper filler layer 20 and the lower filler layer 21.

[0072] Further optionally, the two adjacent vertical tracks of the two circulation tracks are located in the middle range of the distance between side 1 22 and side 2 23; the bottom horizontal track 38 of the two circulation tracks is lower than the lowest support net of the lower filling layer 21, and the top horizontal track 39 is higher than the uppermost support net of the upper filling layer 20; the two mutually distant vertical tracks of the two circulation tracks are close to side 1 22 and side 3 24 respectively.

[0073] Optionally, the bottom of the closed mesh 31 of the lower filling layer 21 is provided with an openable second gate 41. This second gate 41 corresponds to the portion between the penultimate and penultimate support mesh layers of the lower filling layer 21, allowing the filler material of the lower filling layer 21 to fall into the nearby transport trough 36. The transport trough 36 then moves upwards along two adjacent vertical tracks of the two circulation tracks to the uppermost support layer of the upper filling layer 20, where the filler material is poured into the upper filling layer 20. The second gate 41 is a lift-type gate and will not obstruct the upward movement of the transport trough.

[0074] In this invention, the packing material in a pair of packing layers enters the lower packing layer 21 from the upper packing layer 20 through the descending channel 19; after the packing material in the lower packing layer 21 rolls to the bottommost support layer, it is transported to the topmost layer of the upper packing layer 20 by the ascending channel 18, and so on, and the packing material performs self-cleaning in the process of continuous rolling and friction.

[0075] Regarding the ascending channel 18, specifically, the two sub-channels 37 of the same transport trough 36 pass through two bottom horizontal tracks 38, approach each other and connect to form a single transport trough 36. They then simultaneously move upwards at the same speed along two adjacent vertical tracks until they reach the bottom support net of the lower filler layer 21. At this point, the second gate 41 opens, the transport trough 36 receives the filler, and the second gate 41 closes, awaiting the next transport trough 36. The transport trough 36 with filler continues to rise under the guidance of the slider 42 until it reaches the top support net of the upper filler layer 20. Because the length of the transport trough 36 is less than the distance between side 1 22 and side 3 24, and the length of the second gate 41 is equal to the length of the transport trough 36, the filler output from the second gate 41 can all fall into the transport trough 36.

[0076] One end of a support rod 43 is fixedly connected to the bottom of the slider 42, and the other end of the support rod 43 is hinged to the bottom of the slot 37. A telescopic rod 44 is provided on the side of the slider 42, and the telescopic head of the telescopic rod 44 is connected to the side of the slot 37. When the slot 37 transports filler, the telescopic rod 44 is in a retracted state, and the open top surface of the slot 37 is horizontal and upward. When the slot 37 moves to the top of the uppermost support net of the upper filler layer 20, the telescopic rod 44 extends and pushes the slot 37 towards the filler layer. Since the bottom of the slot 37 is hinged to the support rod 43 of a fixed length, the slot 37 rotates around the hinge position as an axis, tilting the corresponding support net to displace the filler. Then the retracting rod retracts, and the slot 37 returns to its original position. The driving device for the retracting rod can be located inside the slider 42 or outside the spray tower, and can move with the slider 42.

[0077] The two sliders 42 move away from each other along the top horizontal track 39, and then move downwards along two vertical tracks that are far apart from each other, until they re-enter the bottom horizontal track 38 and move towards each other again, ready to receive the packing from the lower packing layer 21. The dividing groove 37 remains horizontal as it moves on the circulating track.

[0078] The side 27 of the uppermost (i.e., first) support net of the upper filler layer 20 is connected to the top of the closed net 31, and the side 29 of the uppermost (i.e., first) support net of the lower filler layer 21 is connected to the top of the closed net 33.

[0079] Optionally, the movable sidewall 30 is movably connected to the side 22 of the spray tower. The side 22 is left vacant in the position corresponding to the movable sidewall 30. The side of the movable sidewall 30 facing the side 22 is the inner side, and the side facing the outside of the spray tower is the outer side.

[0080] The inner edge of the movable sidewall 30 is provided with a first sealing step 45 and a second sealing step 46 from the outside to the inside. The second sealing step 46 protrudes from the movable sidewall 30 toward the inside of the spray tower. Both the first sealing step 45 and the second sealing step 46 are provided with sealing gaskets on the sides facing the spray tower. The inner side of the first sealing step 45 can fit tightly against the outer surface of the side wall 22.

[0081] The inner surface of the first sealing step 45 can closely adhere to the outer surface of the side surface 22. The side surface 22 has a step recessed towards the interior of the spray tower at the position corresponding to the second sealing step 46, for sealing with the second sealing step 46. The provision of two sealing barriers, the first sealing step 45 and the second sealing step 46, improves the sealing performance of the movable sidewall 30.

[0082] Optionally, the outer edge of the movable sidewall 30 is provided with several snap-fit ​​components for snapping onto the outer surface of side 22 (i.e., the outer wall surface of the spray tower) to complete the sealing of the movable sidewall 30; a handle is provided in the middle of the outer side of the movable sidewall 30 to facilitate pulling and pushing the movable sidewall 30.

[0083] When the packing needs to be replaced or cleaned, drain the waste gas and waste liquid from the spray tower. Use the external control device to close the first gate 40, allowing all the packing in the descending channel 19 to fall into the lower packing layer 21. Once the lower packing layer 21 is full, discharge any excess packing into the ascending channel 18. Then close the second gate 41, and the ascending channel 18 will carry any excess packing into the upper packing layer 20. Once the upper packing layer 20 is full (and the ascending channel 18 is empty), stop the slider 42 of the ascending channel 18. Then open the locking component and pull out the movable sidewall 30, which will pull out the packing layer. Pour out the packing inside and replace or clean it. Afterward, fill the packing layer with treated or new packing. The packing layer will be pushed into the spray tower along with the movable sidewall 30. Once in place, tighten the locking component and restart the spray tower.

Claims

1. A self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid, characterized in that, The system includes a spray tower and a regenerated water tank. The spray tower has an exhaust port, several layers of packing material, an air inlet pipe, and an exhaust port from top to bottom. Each packing material layer has a spray pipe above it for spraying alkaline solution. The air inlet pipe is used to input waste gas. The waste gas and alkaline solution react in a countercurrent manner. The treated waste gas is discharged from the exhaust port. The exhaust port of the spray tower is connected to the inlet of the regenerated water tank for inputting the reacted alkaline solution into the regenerated water tank. The reclaimed water tank is equipped with an aeration pipe for introducing oxygen. The oxygen reacts with the alkali solution to obtain reclaimed alkali solution. The outlet of the reclaimed water tank is connected to the spray pipe of the spray tower to introduce the reclaimed alkali solution into the spray tower for further treatment of waste gas. The filler layer comprises several layers of inclined support mesh from top to bottom, and the filler material in the same filler layer moves from top to bottom between different support meshes; there are rising channels and falling channels between two adjacent filler layers; The spray tower has a square cross-section and a square support net. The two sides of the support net are detachably connected to the two side walls of the spray tower. The other two side walls of the spray tower are respectively provided with the rising channel and the falling channel. One side of the support net of the lowest layer of the upper filler layer is connected to the top of the descending channel, and the bottom of the descending channel is connected to one side of the support net of the highest layer of the lower filler layer, which is used to transfer the filler from the upper filler layer to the lower filler layer; one side of the support net of the highest layer of the upper filler layer is connected to the top of the ascending channel, and the bottom of the ascending channel is connected to one side of the support net of the lowest layer of the lower filler layer, which is used to transfer the filler from the lower filler layer to the upper filler layer.

2. The self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid according to claim 1, characterized in that, The spray tower includes an exhaust zone, a treatment zone, and a waste liquid zone from top to bottom. A demister is installed between the exhaust zone and the treatment zone to remove mist from the waste gas after treatment in the treatment zone. The air inlet pipe is provided between the treatment area and the waste liquid area. The packing layer and spray pipe are provided in the treatment area. The waste gas comes into contact with and reacts with the alkaline solution sprayed from the spray pipe in the treatment area to remove H2S from the waste gas. The drain outlet is located at the bottom of the waste liquid area. The alkaline solution after the waste gas is treated accumulates in the waste liquid area and is then discharged into the regeneration water tank.

3. The self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid according to claim 2, characterized in that, The regenerated water tank includes an upper reaction zone and a lower slag discharge zone. The water inlet of the regenerated water tank is located at the lower part of the reaction zone, and the aeration pipe is located at the bottom of the reaction zone. The bottom of the slag discharge zone is provided with a slag discharge port for discharging the elemental sulfur precipitate generated by the regeneration reaction.

4. The self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid according to claim 1, characterized in that, The outlet of the regenerated water tank is first connected to a self-cleaning filter, and then to a spray pipe. The self-cleaning filter can filter out elemental sulfur in the regenerated alkali solution.

5. The self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid according to claim 1, characterized in that, The inner diameter of the spray tower corresponding to the packing layer is smaller than the inner diameter of the spray tower that does not correspond to the packing layer. A support platform is provided between the outer edge of the packing layer and the inner wall of the corresponding spray tower. The outer side of the support platform is fixed to the inner wall of the spray tower, and the inner side protrudes into the spray tower and is connected to the support frame of the packing layer.

6. The self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid according to claim 2, characterized in that, The spray tower includes side one, side two, side three, and side four in a clockwise direction, and the outer edge of the support net also includes side one, side two, side three, and side four in a clockwise direction. The area of ​​the side corresponding to the packing layer is provided with a movable sidewall. The side of the support net is detachably connected to the side. When the packing needs to be replaced, the movable sidewall can be pulled outward, and the support net is pulled out of the spray tower along with the movable sidewall. The same packing layer has a closed net on one side of its own support net, a closed net on one side of its own support net, a closed net on one side of its own support net, and a closed net on one side of its own support net, so that when the support net is pulled out, the packing inside is intercepted by the three closed nets and the movable side wall.

7. The self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid according to claim 6, characterized in that, The packing layers in the processing area are arranged in pairs, and the rising channel and the falling channel are provided between the pair of packing layers; in the pair of packing layers, the packing layer at the top is the upper packing layer, and the packing layer at the bottom is the lower packing layer.

8. The self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid according to claim 7, characterized in that, The descent channel is located on side four. The descent channel is enclosed by a fence net to form a closed space, allowing the filler to descend in the space between the fence net and side four. The top of the fence is connected to the side of the lowest support net of the upper filler layer. The distance between the closed net and the corresponding side net is not less than the thickness of the descent channel. The bottom of the closed net of the upper filler layer is provided with an openable first gate, which allows the filler on the last support net to enter the descent channel.

9. The self-cleaning alkaline spray exhaust gas treatment system with regenerable circulating liquid according to claim 7, characterized in that, The ascending channel is located on side two and includes two circulating tracks and several transport troughs. The circulating tracks are square, and the two circulating tracks are at the same height and are arranged horizontally side by side on side two. The transport trough consists of two detachable sections, each of which is connected to a circulating track by a slider; the length of the transport trough is less than the distance between side one and side three.

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