Multi-stage staged flue gas purification denitration tower

Abstract

The invention relates to a multi-stage staged flue gas purification denitration tower applied to the technical field of flue gas treatment, and the multi-stage staged flue gas purification denitration tower comprises a spraying inner tower, a rotating shaft, a layered filler module, an outer tower shell, a gas inlet pipe, a wind power fan blade, a cooling pool, a recovery pool and a buoyancy barrel. The rotary shaft rotates to drive the layered filler module, so that the energy consumption of the purification denitration tower is effectively reduced, the layered filler module in rotary motion can be in better contact with rising flue gas, meanwhile, the layered filler module is uniformly infiltrated by descending spray water, and the purification effect of the layered filler module on the flue gas is effectively improved; the buoyancy barrels at the top and the bottom of the rotating shaft float in the cooling pond and the recycling pond respectively, so that the influence of the buoyancy of the buoyancy barrels on the rotating capacity of the rotating shaft is reduced, the rotating mounting structure of the rotating shaft is simplified, the energy consumption required by rotation of the rotating shaft is effectively reduced, and the rotating effect of the layered filler module is effectively improved.

Description

Technical Field

[0001] The present invention relates to a flue gas purification and denitration tower, in particular to a multi-stage graded flue gas purification and denitration tower applied in the technical field of flue gas treatment. Background Art

[0002] Flue gas purification and denitrification tower is a kind of equipment used for industrial exhaust gas treatment. Its main function is to remove nitrogen oxides from flue gas to meet environmental emission standards. Denitrification towers are usually installed in industrial facilities that emit a large amount of flue gas, such as thermal power plants, steel mills, and cement plants. The desulfurization and denitrification purification treatment of chemical waste gas is mainly based on wet desulfurization and denitrification treatment, and the wet desulfurization and denitrification treatment method is mainly based on spraying, that is, spraying desulfurization and denitrification solvents into the flue gas to make the desulfurization and denitrification solvents react with nitrogen oxides and sulfur oxides in the exhaust gas, thereby removing nitrogen oxides and sulfur oxides from the exhaust gas.

[0003] The specification of Chinese invention patent CN202111568089.8 discloses "A desulfurization and denitrification purification tower for waste gas discharged from a chemical plant". The desulfurization and denitrification treatment liquid sprayed from multiple spray ports on the cylinder contacts the waste gas, and because the cylinder is always in a rotating state during operation, the sprayed desulfurization and denitrification treatment liquid stirs the waste gas, thereby slowing down the flow speed of the flue gas, increasing the contact opportunity between the waste gas and the desulfurization and denitrification treatment liquid, and thus making the desulfurization and denitrification treatment of the waste gas more thorough and improving the treatment efficiency. The specification of Chinese invention patent CN202222700666.0 discloses "A desulfurization and denitrification tower for waste gas purification". Through the action of the stirring rod on the tower body, the rotating active rod can drive the stirring rod to stir the filter material in the tower body through the rotating rod, which is convenient for rapid purification and desulfurization of the gas.

[0004] In order to improve the purification effect of flue gas, the spray equipment and purification fillers in the tower will adopt a rotating method to improve the purification effect of flue gas. However, due to the internal environment of the humidification purification tower and the weight of the spray equipment and purification fillers themselves, the traditional bearing rotating structure is easily affected by long-term heavy pressure and moisture corrosion. The rotating structure affected by heavy pressure needs to consume higher kinetic energy to drive the spray equipment and purification fillers to rotate, affecting the cost of flue gas purification. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the traditional bearing rotating structure is easily affected by long-term heavy pressure and moisture corrosion, and the high energy consumption affects the flue gas purification cost.

[0006] In order to solve the above problems, the present invention provides a multi-stage graded flue gas purification and denitration tower, comprising a spray inner tower, the interior of the spray inner tower is rotatably connected with a rotating shaft, the exterior of the rotating shaft is fixedly connected with a plurality of layered filler modules in sequence from top to bottom, the exterior of the spray inner tower is sleeved with an outer tower shell, the bottom of the outer tower shell is connected with the bottom of the spray inner tower, and the top of the outer tower shell is fixedly connected with an air inlet pipe, the top of the rotating shaft is fixedly connected with a wind fan blade, and the wind fan blade corresponds vertically to the air inlet pipe;

[0007] The top and bottom of the spray inner tower are fixedly connected to a cooling pool and a recovery pool respectively. Ventilation pipes are distributed in a fixed matrix inside the cooling pool. The bottom ends of the ventilating pipes are connected to the lower surface of the cooling pool. The top and bottom of the rotating shaft are fixedly connected to buoyancy barrels. The two buoyancy barrels float in the cooling pool and the recovery pool respectively.

[0008] A spray pump is fixedly connected to the bottom of the cooling pool, and a spray pipe is fixedly connected to the output end of the spray pump. Multiple mesh spray modules are fixedly connected to the inside of the spray tower from top to bottom. The mesh spray modules are fixedly connected to the spray pipe, and the mesh spray modules correspond to the layered filler modules in parallel.

[0009] In the above-mentioned multi-stage graded flue gas purification and denitrification tower, the flue gas input through the air inlet pipe drives the wind fan blades, so that the rotating shaft rotates to drive the layered packing module, effectively improving the purification effect of the layered packing module on the flue gas, and floating in the cooling pool and the recovery pool through the buoyancy barrel, and the buoyancy of the buoyancy barrel is used to reduce the influence of the mass of the high-layered packing module on the rotation ability of the rotating shaft, effectively improving the rotation effect of the layered packing module.

[0010] As a further improvement of the present application, a water inlet pipe is fixedly connected to the top of the exhaust pipe, and one end of the water inlet pipe extending into the spray inner tower is fixedly connected to a water outlet ring groove, and the outside of the rotating shaft is fixedly connected to a hydraulic fan blade, and the hydraulic fan blade vertically corresponds to the water outlet ring groove. The water inlet pipe is used to provide water for spraying to the spray inner tower, and water overflows from the water outlet ring groove and falls. The falling water drives the hydraulic fan blades, further providing power for the rotation of the rotating shaft.

[0011] As a further improvement of the present application, the top of the net spraying module is fixedly connected to a water storage ring groove, and the bottom of the layered filling module is fixedly connected to a floating ring body, and the floating ring body corresponds to the water storage ring groove. The floating ring body floats in the water storage ring groove to further reduce the influence of the layered filling module's own gravity on the rotation.

[0012] As another improvement of the present application, the outer ring of the water storage ring groove is fixedly connected to the inner wall of the spray inner tower, and the spray inner tower is provided with a seepage hole corresponding to the height of the outer ring of the water storage ring groove. The excess water in the water storage ring groove seeps out of the spray inner tower through the seepage hole, and the seeped water is used for dust removal and pre-purification of the flue gas between the outer tower shell and the spray inner tower.

[0013] As another improvement supplement of the present application, the inner wall of the outer tower shell and the outer wall of the spray inner tower are fixedly connected with retaining ring pages, the two groups of retaining ring pages are staggered and correspond to each other, and the retaining ring pages are arranged to be tilted downward, the seepage holes correspond to the top of the retaining ring pages, and the seeped water flows between the retaining ring pages, thereby effectively improving the contact effect between the seeped water and the flue gas, thereby effectively improving the flue gas purification effect.

[0014] As another improvement supplement of the present application, a blocking cotton column is inserted into the inside of the seepage hole. The blocking cotton column is made of sponge material. The seepage hole is blocked by the blocking cotton column. Water can seep out through the blocking cotton column, but the smoke cannot directly enter the spray tower through the seepage hole.

[0015] As another improvement of the present application, one end of the blocking sponge column extending into the inner tower of the spray is fixedly connected to a water-absorbing sponge head, and the outer ring of the floating ring is fixedly connected to an extrusion end block, which is in contact with and corresponds to the water-absorbing sponge head. The blocking sponge column utilizes the water-absorbing sponge head to effectively increase the water absorption area, thereby improving the water seepage effect, and the rotation of the floating ring drives the extrusion end block to regularly squeeze the water-absorbing sponge head to squeeze the water outward. The squeezed water has more impact power than the seeping water, thereby effectively improving the flushing and cleaning effect of the water on the surface of the retaining ring page.

[0016] As another improvement supplement to the present application, the outside of the absorbent sponge head is wrapped with a protective film sleeve, and a sleeve opening is opened at the bottom of the protective film sleeve facing one end of the floating ring body. A pre-pressing block is fixedly connected to the end of the extrusion end block corresponding to the rotation direction, and the pre-pressing block corresponds to the sleeve opening. The absorbent sponge head is wrapped with the protective film sleeve, which effectively improves the protection ability of the absorbent sponge head. At the same time, before the extrusion end block squeezes the absorbent sponge head, the pre-pressing block first presses and closes the sleeve opening, thereby allowing more water inside the absorbent sponge head to be squeezed out from the blocked sponge column.

[0017] To summarize, the present invention drives the wind fan blades through the flue gas input through the air intake pipe, realizes the rotation of the rotating shaft to drive the layered packing module, and effectively reduces the energy consumption of the purification and denitrification tower. The rotating layered packing module can better contact with the rising flue gas, and at the same time allow the descending spray water to evenly infiltrate the layered packing module, effectively improving the purification effect of the layered packing module on the flue gas. The buoyancy barrels at the top and bottom of the rotating shaft float in the cooling pool and the recovery pool respectively, so that the buoyancy of the buoyancy barrels reduces the influence of the mass of the high-layered packing module on the rotation ability of the rotating shaft, simplifies the rotating installation structure of the rotating shaft, effectively reduces the energy consumption required for the rotation of the rotating shaft, and effectively improves the rotation effect of the layered packing module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional structural diagram of the first embodiment of the present application;

[0019] Figure 2 This is an appearance diagram of the first embodiment of the present application;

[0020] Figure 3 This is a three-dimensional cross-sectional view of a cooling pool according to a first embodiment of the present application;

[0021] Figure 4 This is a cross-sectional view of a layered filler module and a water storage ring groove according to the first embodiment of the present application;

[0022] Figure 5 This is a bottom-up stereoscopic structural diagram of the screen spraying module of the first embodiment of the present application;

[0023] Figure 6 This is a top-down perspective structural diagram of a cooling pool in the first embodiment of the present application;

[0024] Figure 7 This is a three-dimensional structural diagram of a layered packing module and a floating ring body according to the first embodiment of the present application;

[0025] Figure 8 This is an enlarged view of the seepage hole and the extruded end block of the second embodiment of the present application;

[0026] Fig. 9 This is an enlarged view of the extruded end block and the protective film sleeve of the second embodiment of the present application;

[0027] Fig.10 This is a three-dimensional structural diagram of the blocking sponge column, the absorbent sponge head and the protective film sleeve according to the second embodiment of the present application.

[0028] Description of the numbers in the figure:

[0029] 1. Spray inner tower; 101. Rotating shaft; 102. Layered filler module; 103. Wind fan blades; 104. Cooling pool; 105. Recovery pool; 106. Ventilation pipe; 107. Buoyancy barrel; 108. Spray pump; 109. Spray pipe; 110. Net spray module; 2. Outer tower shell; 201. Air inlet pipe; 202. Water seepage hole; 203. Retaining ring leaf; 204. Blocking cotton column; 205. Water-absorbing cotton head; 206. Extrusion end block; 207. Protective film sleeve; 208. Sleeve mouth; 209. Pre-pressing block; 3. Exhaust pipe; 301. Water inlet pipe; 302. Water outlet ring groove; 303. Hydraulic fan blades; 304. Water storage ring groove; 305. Floating ring body. DETAILED DESCRIPTION

[0030] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0031] The first implementation method:

[0032] Figures 1 to 5The multi-stage graded flue gas purification and denitration tower is shown, comprising a spray inner tower 1, the interior of the spray inner tower 1 is rotatably connected to a rotating shaft 101, the exterior of the rotating shaft 101 is fixedly connected with a plurality of layered filler modules 102 in sequence from top to bottom, the exterior of the spray inner tower 1 is sleeved with an outer tower shell 2, the bottom of the outer tower shell 2 is connected to the bottom of the spray inner tower 1, and the top of the outer tower shell 2 is fixedly connected with an air inlet pipe 201, and the top of the rotating shaft 101 is fixedly connected with a wind blade 103, and the wind blade 103 corresponds vertically to the air inlet pipe 201, the top and bottom of the spray inner tower 1 are respectively fixedly connected to the cooling pool 104 and the recovery pool 105, the bottom of the cooling pool 104 is fixedly connected to the spray pump 108, the output end of the spray pump 108 is fixedly connected to the spray pipe 109, and the inside of the spray inner tower 1 is fixedly connected with a plurality of net spray modules 110 from top to bottom, the net spray module 110 is fixedly connected to the spray pipe 109, and the net spray module 110 corresponds parallel to the layered filler module 102;

[0033] When the flue gas is treated, the flue gas is delivered from the air inlet pipe 201 at the top of the outer tower shell 2. The newly delivered flue gas has a certain wind speed, so that the flue gas drives the wind fan blades 103, realizes the automatic rotation of the rotating shaft 101, and makes full use of the wind energy of the flue gas, effectively reducing the energy consumption of the purification and denitrification tower. The flue gas descends from between the spray inner tower 1 and the outer tower shell 2, and enters the spray inner tower 1 from the bottom. The rotating layered packing module 102 is better in contact with the rising flue gas, and the sprayed water more evenly infiltrates the layered packing module 102, effectively improving the purification effect of the layered packing module 102 on the flue gas.

[0034] Figures 3 to 7 As shown, ventilation pipes 106 are distributed in a fixed matrix inside the cooling pool 104, and the bottom ends of the ventilation pipes 106 are connected to the lower surface of the cooling pool 104. The top and bottom of the rotating shaft 101 are fixedly connected with buoyancy barrels 107, and the two buoyancy barrels 107 float in the cooling pool 104 and the recovery pool 105 respectively. The top of the net spraying module 110 is fixedly connected with a water storage ring groove 304, and the bottom of the layered filler module 102 is fixedly connected with a floating ring body 305, and the floating ring body 305 corresponds to the water storage ring groove 304. The floating ring body 305 is used to float in the water storage ring groove 304, so as to further reduce the influence of the gravity of the layered filler module 102 on the rotation;

[0035] When spraying is performed in the flue gas purification and denitrification tower, the water for spraying is first filled into the cooling pool 104, and then recycled by the recovery pool 105 after spraying. Therefore, both the cooling pool 104 and the recovery pool 105 have sufficient water, and the buoyancy barrels 107 at the top and bottom of the rotating shaft 101 can float stably in the cooling pool 104 and the recovery pool 105. Similarly, the water storage ring groove 304 receives the water precipitated from each layer of the stratified filler module 102, so that an appropriate amount of water is stored inside the water storage ring groove 304 for the floating ring body 305 to float, thereby utilizing the buoyancy of the buoyancy barrel 107 and the floating ring body 305 to offset the pressure caused by the mass of the stratified filler module 102 on the rotating shaft 101, simplifying the rotating installation structure of the rotating shaft 101, and facilitating the rotational movement of the rotating shaft 101 with low energy consumption, thereby facilitating the rotational movement of the stratified filler module 102.

[0036] Figure 3 and Figure 6 As shown, a water inlet pipe 301 is fixedly connected to the top of the exhaust pipe 3, and one end of the water inlet pipe 301 extending into the spray inner tower 1 is fixedly connected to a water outlet ring groove 302, and a hydraulic fan blade 303 is fixedly connected to the outside of the rotating shaft 101, and the hydraulic fan blade 303 vertically corresponds to the water outlet ring groove 302. The water inlet pipe 301 is used to provide spray water to the spray inner tower 1, and water overflows from the water outlet ring groove 302 and falls, and the falling water drives the hydraulic fan blade 303, further providing power for the rotation of the rotating shaft 101;

[0037] When the water inlet pipe 301 transports water for spraying into the inner spray tower 1, the water delivered by the water inlet pipe 301 enters the water outlet ring groove 302 for distribution, so that the water overflows from the water outlet ring groove 302 to the outside in a ring shape, thereby allowing the water to evenly contact the hydraulic fan blades 303, and the automatic rotation of the rotating shaft 101 is realized by driving the hydraulic fan blades 303, further providing kinetic energy for the rotation of the rotating shaft 101, and effectively improving the rotation ability of the rotating shaft 101.

[0038] The second implementation method:

[0039] Compared with the first embodiment, the main new addition is a water seepage hole 202. The specific structure is as follows, and the rest of the structure is consistent with the first embodiment.

[0040] Figure 4 and Figure 8As shown, the outer ring of the water storage ring groove 304 is fixedly connected to the inner wall of the spray inner tower 1, and the spray inner tower 1 is provided with a water seepage hole 202 at a height corresponding to the outer ring of the water storage ring groove 304. The excess water in the water storage ring groove 304 seeps out of the spray inner tower 1 through the water seepage hole 202, and the seeped water performs dust removal and pre-purification on the flue gas between the outer tower shell 2 and the spray inner tower 1. The inner wall of the outer tower shell 2 and the outer wall of the spray inner tower 1 are both fixedly connected with retaining ring pages 203, and the two sets of retaining ring pages 203 correspond to each other in an interlaced manner, and the retaining ring pages 203 are downward. The seepage hole 202 is arranged obliquely, and corresponds to the top of the retaining ring page 203. The seepage water flows between the retaining ring pages 203, thereby effectively improving the contact effect between the seepage water and the flue gas, thereby effectively improving the flue gas purification effect. A blocking sponge column 204 is inserted into the inside of the seepage hole 202. The blocking sponge column 204 is made of sponge material. The seepage hole 202 is blocked by the blocking sponge column 204. Water can seep out through the blocking sponge column 204, but the flue gas cannot directly enter the spray inner tower 1 through the seepage hole 202;

[0041] After a proper amount of water is stored inside the water storage annular groove 304, the excess water continues to fall from the inner ring edge of the water storage annular groove 304 to the lower layer of the layered filling module 102, and some water seeps outward from the seepage hole 202 opened on the spray inner tower 1 at the outer ring edge of the water storage annular groove 304, that is, the water penetrates between the spray inner tower 1 and the outer tower shell 2. There is flue gas moving downward between the spray inner tower 1 and the outer tower shell 2. The flue gas contacts the seeping water, causing the dust in the flue gas to adhere, thereby achieving a dust reduction effect on the flue gas, thereby effectively improving the spraying effect of the flue gas in the spray inner tower 1, and the blocking cotton column 204 blocks the seepage hole 202. Water can seep out through the blocking cotton column 204, but the flue gas cannot directly enter the spray inner tower 1 through the seepage hole 202.

[0042] Figure 4 and Figures 7 to 10As shown, the plugging sponge column 204 extends into the spray inner tower 1 and one end is fixedly connected to a water-absorbing sponge head 205, and the outer ring of the floating ring body 305 is fixedly connected to an extrusion end block 206, which contacts and corresponds to the water-absorbing sponge head 205. The plugging sponge column 204 uses the water-absorbing sponge head 205 to effectively increase the water absorption area, thereby improving the water seepage effect, and the floating ring body 305 rotates to drive the extrusion end block 206 to regularly squeeze the water-absorbing sponge head 205 to squeeze the water outward. The squeezed water has more impact than the seepage water, thereby effectively improving the water scouring and cleaning effect on the surface of the retaining ring page 203. The head 205 is wrapped with a protective film sleeve 207 on the outside, and a sleeve opening 208 is provided at one end of the bottom of the protective film sleeve 207 facing the floating ring body 305. A pre-pressing block 209 is fixedly connected to the end of the extrusion end block 206 corresponding to the rotation direction, and the pre-pressing block 209 corresponds to the sleeve opening 208. The protective film sleeve 207 is used to wrap the water-absorbing sponge head 205, which effectively improves the protection ability of the water-absorbing sponge head. At the same time, before the extrusion end block 206 squeezes the water-absorbing sponge head 205, the pre-pressing block 209 first presses and closes the sleeve opening 208, so that more water inside the water-absorbing sponge head 205 is squeezed out from the blocking sponge column 204.

[0043] When the water inside the water storage ring groove 304 seeps outward through the blocking sponge column 204 on the seepage hole 202, the blocking sponge column 204 uses the water-absorbing sponge head 205 to effectively increase the water absorption area, thereby improving the water seepage effect. Affected by the rotation of the layered filler module 102, the extrusion end block 206 of the outer ring of the floating ring body 305 regularly squeezes the water-absorbing sponge head 205, and the squeezed water has more impact ability than the seepage water, thereby effectively improving the water The flushing and cleaning effect of the surface of the retaining ring page 203 is effectively improved. The protective film sleeve 207 protectively wraps the water-absorbing sponge head 205 to effectively avoid tearing damage to the water-absorbing sponge head 205. At the same time, the pre-pressing block 209 is used to first compress and seal the sleeve 208 to prevent the water absorbed by the water-absorbing sponge head 205 from being squeezed out in the direction of the blocking sponge column 204. The water is concentrated and squeezed outward through the blocking sponge column 204, thereby effectively increasing the extrusion amount of water and effectively improving the flushing effect on the surface of the retaining ring page 203.

[0044] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A multi-stage graded flue gas purification and denitration tower, characterized in that: The invention comprises a spray inner tower (1), wherein the interior of the spray inner tower (1) is rotatably connected to a rotating shaft (101), and the exterior of the rotating shaft (101) is fixedly connected to a plurality of layered filler modules (102) in sequence from top to bottom, and the exterior of the spray inner tower (1) is sleeved with an outer tower shell (2), the bottom of the outer tower shell (2) is connected to the bottom of the spray inner tower (1), and the top of the outer tower shell (2) is fixedly connected to an air inlet pipe (201), and the top of the rotating shaft (101) is fixedly connected to a wind blade (103), and the wind blade (103) corresponds vertically to the air inlet pipe (201); The top and bottom of the spray inner tower (1) are respectively fixedly connected to a cooling pool (104) and a recovery pool (105); ventilation pipes (106) are distributed in a fixed matrix inside the cooling pool (104); the bottom ends of the ventilation pipes (106) are communicated with the lower surface of the cooling pool (104); the top of the spray inner tower (1) is fixedly connected to an exhaust pipe (3); the exhaust pipe (3) extends through the top of the outer tower shell (2); the top and bottom of the rotating shaft (101) are both fixedly connected to buoyancy barrels (107); the two buoyancy barrels (107) float in the cooling pool (104) and the recovery pool (105) respectively; The bottom of the cooling pool (104) is fixedly connected to a spray pump (108), the output end of the spray pump (108) is fixedly connected to a spray pipe (109), and the interior of the spray inner tower (1) is fixedly connected with a plurality of mesh spray modules (110) in sequence from top to bottom, the mesh spray modules (110) are fixedly connected to the spray pipe (109), and the mesh spray modules (110) correspond in parallel to the layered filler modules (102).

2. A multi-stage graded flue gas purification and denitration tower according to claim 1, characterized in that: The top of the exhaust pipe (3) is fixedly connected to a water inlet pipe (301), one end of the water inlet pipe (301) extending into the spray inner tower (1) is fixedly connected to a water outlet ring groove (302), and the outside of the rotating shaft (101) is fixedly connected to a hydraulic fan blade (303), and the hydraulic fan blade (303) vertically corresponds to the water outlet ring groove (302).

3. A multi-stage graded flue gas purification and denitration tower according to claim 2, characterized in that: The top of the net spraying module (110) is fixedly connected to a water storage annular groove (304), and the bottom of the layered filler module (102) is fixedly connected to a floating ring body (305), and the floating ring body (305) corresponds to the water storage annular groove (304).

4. A multi-stage graded flue gas purification and denitration tower according to claim 3, characterized in that: The outer ring of the water storage annular groove (304) is fixedly connected to the inner wall of the spray inner tower (1), and the spray inner tower (1) is provided with a water seepage hole (202) at a height corresponding to the outer ring of the water storage annular groove (304).

5. A multi-stage graded flue gas purification and denitration tower according to claim 4, characterized in that: The inner wall of the outer tower shell (2) and the outer wall of the spray inner tower (1) are both fixedly connected with retaining ring pages (203), the two groups of retaining ring pages (203) are staggered and correspond to each other, and the retaining ring pages (203) are arranged to be inclined downward, and the water seepage holes (202) correspond to the top ends of the retaining ring pages (203).

6. The multi-stage graded flue gas purification and denitration tower according to claim 4, characterized in that: A blocking sponge column (204) is inserted into the interior of the water seepage hole (202), and the blocking sponge column (204) is made of sponge material.

7. The multi-stage graded flue gas purification and denitration tower according to claim 6, characterized in that: One end of the blocking sponge column (204) extending into the spray inner tower (1) is fixedly connected to a water-absorbing sponge head (205), and the outer ring of the floating ring body (305) is fixedly connected to an extrusion end block (206), and the extrusion end block (206) is in contact with and corresponds to the water-absorbing sponge head (205).

8. The multi-stage graded flue gas purification and denitration tower according to claim 7, characterized in that: The outside of the water-absorbing sponge head (205) is wrapped with a protective film sleeve (207), and a sleeve opening (208) is opened at one end of the bottom of the protective film sleeve (207) facing the floating ring body (305), and a pre-pressing block (209) is fixedly connected to one end of the extrusion end block (206) corresponding to the rotation direction, and the pre-pressing block (209) corresponds to the sleeve opening (208).

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