Desulfurization, denitration, dust removal and thallium removal integrated system for kiln tail gas treatment

Abstract

The utility model relates to the technical field of application of a desulfurization, denitrification, dust removal and thallium removal integrated device in kiln tail gas treatment, in particular to a desulfurization, denitrification, dust removal and thallium removal integrated system for kiln tail gas treatment. The dust removal device is arranged on the smoke collection main pipe and is used for filtering dust gas in the kiln tail gas; the air inducing device is arranged on the smoke collecting main pipe and is used for discharging the tail gas filtered in the dust removing device into the thallium removing and washing device; tail gas enters the desulfurization, denitrification, dust removal and thallium removal device through a first connecting pipe, the tail gas in a first tower body is purified through a dust removal plate and a filter plate, the tail gas reaches the ultra-low emission index and then is directly discharged into the atmosphere through a top chimney, and a solution absorbing sulfur dioxide is extracted out from the bottom of the first tower body through cooperation of a first circulating pump, a first suction pipe and a first circulating pipe; and the gas is sent back to the top of the tower body I through the working pressure of the pump, so that recycling is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of application of an integrated desulfurization, denitration, dust removal and thallium removal device in kiln tail gas treatment, in particular to an integrated desulfurization, denitration, dust removal and thallium removal system for kiln tail gas treatment. Background Art

[0002] Industrial electric kilns produce tail gas containing ammonia and a small amount of tar during the sintering process of lithium iron phosphate. Ammonia is a foul-smelling substance. If it is directly discharged into the atmosphere, it will have a serious impact on the human respiratory system, circulatory system, digestive system, etc.

[0003] According to the Chinese patent publication number CN219150408U, the technical solution disclosed in the patent document is as follows: The utility model discloses a chimney straight-discharge integrated tower for smelting furnace tail gas treatment, including a tower body, a wet electrostatic precipitator is fixedly connected to the upper end of the tower body, a tower base is fixedly connected to the lower end of the tower body, a stirrer distributed around the outer wall of the tower base is fixedly connected, a slurry circulation pump is fixedly connected to one side of the tower base through a conduit, the liquid outlet of the slurry circulation pump is connected to an electric control valve through a conduit, and the other end of the electric control valve is connected to a lower spray device through a conduit, and the lower spray device is evenly installed inside the tower body at equal intervals, and the upper end of the wet electrostatic precipitator is fixedly connected to an exhaust electric valve, and the other end of the exhaust electric valve is fixedly connected to an exhaust pipe, and a detection hole is provided at the front end of the exhaust pipe. The utility model reduces the intermediate transportation link of flue gas by integrating the wet electrostatic precipitator process equipment and the water spray process equipment, which can reduce the difficulty of flue gas treatment and improve the flue gas treatment effect.

[0004] In the prior art, the device encounters the problem that the kiln tail gas treatment in the lithium carbonate production process is not perfect, resulting in excessive emission of heavy metal thallium and environmental pollution. In view of this, we propose an integrated desulfurization, denitrification, dust removal and thallium removal system for kiln tail gas treatment. Utility Model Content

[0005] The purpose of the utility model is to provide an integrated system for desulfurization, denitrification, dust removal and thallium removal for kiln tail gas treatment, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An integrated desulfurization, denitration, dust removal and thallium removal system for treating kiln tail gas comprises: a smoke collecting main pipe; a dust removal device, arranged on the smoke collecting main pipe, used to filter dust gas in the kiln tail gas; an induced draft device, arranged on the smoke collecting main pipe, used to discharge the tail gas filtered inside the dust removal device into the inside of a thallium removal washing device; a thallium removal washing device, arranged on the smoke collecting main pipe, used to remove thallium from the kiln tail gas; a desulfurization, denitration, dust removal and thallium removal device, arranged on the smoke collecting main pipe, used to perform the final desulfurization, denitration, dust removal and thallium removal on the kiln tail gas; wherein, The desulfurization, denitrification, dust removal and thallium removal device includes a tower body, which is arranged on the right side of the smoke collecting main pipe, and the bottom of the tower body is fixedly connected to an integrated sedimentation tank for desulfurization, denitrification, dust removal and thallium removal, and the inner wall of the tower body is fixedly connected to a dust removal plate, and the right side of the tower body is fixedly connected to a circulating pump, and the top of the desulfurization, denitrification, dust removal and thallium removal integrated sedimentation tank is fixedly connected to a suction pipe, and the top of the suction pipe is fixedly connected to a circulating pump, and the top of the circulating pump is fixedly connected to a circulating pipe, and the other end of the circulating pipe is fixedly passed through the tower body and is connected to the inside of the tower body.

[0008] Preferably, a chimney is fixedly connected to the top of the tower body, a filter plate is fixedly connected to the front of the inner wall of the tower body, and a pressure filter and sewage thallium and fluorine removal device is fixedly connected to the bottom of the desulfurization, denitrification, dust removal and thallium removal integrated sedimentation tank.

[0009] Preferably, the thallium removal and washing device includes a connecting pipe 1, the connecting pipe 1 is fixedly connected to the left side of the tower body 1, the bottom of the connecting pipe 1 is fixedly connected to the tower body 2, the bottom of the tower body 2 is fixedly connected to a thallium removal sedimentation tank, the bottom of the thallium removal sedimentation tank is fixedly connected to a pressure filter and sewage thallium and fluorine removal device 2, the top of the thallium removal sedimentation tank is fixedly connected to a suction pipe 2, the right side of the tower body 2 is fixedly connected to a circulating pump 2, and the top of the suction pipe 2 is fixedly connected to the circulating pump 2.

[0010] Preferably, a circulation pipe 2 is fixedly connected to the top of the circulation pump 2, and the other end of the circulation pipe 2 is fixedly passed through the tower body 2 and is connected to the interior of the tower body 2.

[0011] Preferably, the induced draft device includes a connecting pipe 2, the right side of the connecting pipe 2 is fixedly connected to the left side of the tower body 2, the left side of the connecting pipe 2 is fixedly connected to an induced draft fan, and the left side of the induced draft fan is fixedly connected to a connecting pipe 3.

[0012] Preferably, the dust removal device includes a tower body three, the tower body three is fixedly connected to the left side of the connecting pipe three, the bottom of the tower body three is fixedly connected to a support leg, the bottom of the tower body three is fixedly connected to an ash hopper, the bottom of the ash hopper is fixedly connected to a frequency converter, and the bottom of the ash hopper is fixedly connected to a dust storage device.

[0013] Preferably, maintenance stairs are fixedly connected to the three outer walls of the tower body.

[0014] Preferably, the following steps:

[0015] S1. The kiln flue gas comes from the smoke collecting main pipe and discharges the kiln tail gas into the dust removal device. The kiln tail gas enters the tower body three, passes through the tower body three dust removal, and the removed dust gas enters the ash hopper and enters the dust storage device.

[0016] S2. The induced draft fan discharges the exhaust gas after dust removal by the dust removal device into the thallium removal washing device through connecting pipe three and connecting pipe two.

[0017] S3, the thallium removal washing device removes thallium from the tail gas entering the tower body 2. When the air flows through the thallium removal sedimentation tank, the water molecules will absorb the pollutants in the air, causing them to precipitate into the water. Through the cooperation of the circulation pump 2, the suction pipe 2 and the circulation pipe 2, the solution that absorbs sulfur dioxide is extracted from the bottom of the desulfurization tower, and then sent back to the top of the tower body 2 by the working pressure of the pump to achieve recycling.

[0018] S4. The tail gas enters the desulfurization, denitrification, dust removal and thallium removal device through the connecting pipe 1, passes through the dust removal plate and the filter plate, and the tail gas inside the tower body 1 is purified to reach the ultra-low emission index and then discharged directly into the atmosphere through the top chimney. Through the cooperation of the circulating pump 1, the suction pipe 1 and the circulating pipe 1, the solution that absorbs sulfur dioxide is extracted from the bottom of the tower body 1, and then sent back to the top of the tower body 1 through the working pressure of the pump to achieve recycling.

[0019] S5, the thallium removal sedimentation tank and the integrated desulfurization, denitrification, dust removal and thallium removal sedimentation tank are sent to the pressure filtration and thallium removal and defluorination device 1 and the pressure filtration and thallium removal and defluorination device 2 for further treatment to meet the environmental emission standards.

[0020] Compared with the prior art, it has the following beneficial effects:

[0021] 1. This is an integrated system for desulfurization, denitrification, dust removal and thallium removal for kiln tail gas treatment. The tail gas enters the desulfurization, denitrification, dust removal and thallium removal device through a connecting pipe 1, passes through a dust removal plate and a filter plate, and the tail gas inside a tower body 1 is purified to reach an ultra-low emission index and then directly discharged into the atmosphere through a top chimney. Through the cooperation of a circulating pump 1, a suction pipe 1 and a circulating pipe 1, a solution that absorbs sulfur dioxide is extracted from the bottom of the tower body 1, and then sent back to the top of the tower body 1 through the working pressure of the pump to achieve recycling.

[0022] 2. This is an integrated system for desulfurization, denitrification, dust removal and thallium removal for the treatment of kiln exhaust gas. The exhaust gas entering the second tower body is dethallized. When the air flows through the dethallium sedimentation tank, water molecules will absorb pollutants in the air, causing them to precipitate into the water. Through the cooperation of the second circulating pump, the second suction pipe and the second circulating pipe, the solution that absorbs sulfur dioxide is extracted from the bottom of the desulfurization tower, and then sent back to the top of the second tower body through the working pressure of the pump to achieve recycling.

[0023] 3. This kind of kiln exhaust gas treatment uses an integrated desulfurization, denitrification, dust removal and thallium removal system. The kiln exhaust gas enters the tower body three, and after the dust removal in the tower body three, the removed dust gas enters the ash hopper and then enters the dust storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 For this utility model Figure 1 A is an enlarged structural diagram;

[0026] Figure 3 For this utility model Figure 1 Enlarged structural diagram at point B.

[0027] In the figure: 1. Smoke collecting main pipe; 2. Dust removal device; 21. Tower body 3; 22. Ash hopper; 23. Maintenance stairs; 24. Frequency converter; 25. Dust storage; 26. Support legs; 3. Induced draft device; 31. Connecting pipe 3; 32. Induced draft fan; 33. Connecting pipe 2; 4. Thallium removal washing device; 41. Tower body 2; 42. Circulation pump 2; 43. Circulation pipe 2; 44. Thallium removal sedimentation tank; 45. Second device for filter press and wastewater thallium and fluorine removal; 46. First connecting pipe; 47. Second suction pipe; 5. Device for desulfurization, denitrification, dust removal and thallium removal; 51. First tower body; 52. Dust removal plate; 53. Chimney; 54. First circulating pump; 55. First circulating pipe; 56. Integrated sedimentation tank for desulfurization, denitrification, dust removal and thallium removal; 57. Second device for filter press and wastewater thallium and fluorine removal; 58. Filter plate; 59. First suction pipe. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] like Figure 1-3As shown, a desulfurization, denitrification, dust removal and thallium removal integrated system for treating kiln tail gas comprises a smoke collecting main pipe 1; a dust removal device 2, which is arranged on the smoke collecting main pipe 1 and is used to filter the dust in the kiln tail gas; an induced draft device 3, which is arranged on the smoke collecting main pipe 1 and is used to discharge the tail gas filtered inside the dust removal device 2 into the inside of a thallium removal washing device 4; the thallium removal washing device 4, which is arranged on the smoke collecting main pipe 1 and is used to remove thallium from the kiln tail gas; a desulfurization, denitrification, dust removal and thallium removal device 5, which is arranged on the smoke collecting main pipe 1 and is used to perform the final Desulfurization, denitration, dust removal and thallium removal; wherein, the desulfurization, denitration, dust removal and thallium removal device 5 includes a tower body 51, the tower body 51 is arranged on the right side of the smoke collecting main pipe 1, the bottom of the tower body 51 is fixedly connected to a desulfurization, denitration, dust removal and thallium integrated sedimentation tank 56, the inner wall of the tower body 51 is fixedly connected to a dust removal plate 52, the right side of the tower body 51 is fixedly connected to a circulating pump 54, the top of the desulfurization, denitration, dust removal and thallium integrated sedimentation tank 56 is fixedly connected to a suction pipe 59, and the top of the suction pipe 59 is fixedly connected to the circulating pump 54, and the top of the circulating pump 54 A circulation pipe 55 is fixedly connected, and the other end of the circulation pipe 55 is fixedly passed through the tower body 51 and is connected to the inside of the tower body 51. A chimney 53 is fixedly connected to the top of the tower body 51, and a filter plate 58 is fixedly connected to the front of the inner wall of the tower body 51. A depressurization and denitration dust removal and thallium removal device 57 is fixedly connected to the bottom of the desulfurization, denitration, dust removal and thallium removal integrated sedimentation tank 56. The exhaust gas enters the desulfurization, denitration, dust removal and thallium removal device 5 through the connecting pipe 46, passes through the dust removal plate 52 and the filter plate 58, and the exhaust gas inside the tower body 51 is After purification and reaching the ultra-low emission index, it is directly discharged into the atmosphere through the top chimney 53. After the cooperation of the circulating pump 54, the suction pipe 59 and the circulating pipe 55, the solution that absorbs sulfur dioxide is extracted from the bottom of the tower body 51, and then sent back to the top of the tower body 51 by the working pressure of the pump to achieve recycling. The dethallium sedimentation tank 44 and the desulfurization, denitrification, dust removal and dethallium integrated sedimentation tank 56 are sent to the de-pressure filtration and de-thallium defluorination device 45 and the de-pressure filtration and de-thallium defluorination device 2 57 for further treatment to meet the environmental emission standards.

[0030] The thallium removal washing device 4 includes a connecting pipe 46, which is fixedly connected to the left side of the tower body 51, the bottom of the connecting pipe 46 is fixedly connected to the tower body 41, the bottom of the tower body 41 is fixedly connected to the thallium removal sedimentation tank 44, the bottom of the thallium removal sedimentation tank 44 is fixedly connected to the filter press and sewage thallium removal and defluorination device 45, the top of the thallium removal sedimentation tank 44 is fixedly connected to the suction pipe 47, the right side of the tower body 41 is fixedly connected to the circulation pump 42, and the top of the suction pipe 47 is fixedly connected to the circulation pump 42, and the top of the circulation pump 42 is fixedly connected to A circulation pipe 43 is provided, and the other end of the circulation pipe 43 is fixedly passed through the tower body 41 and is connected to the inside of the tower body 41. The thallium removal washing device 4 removes thallium from the tail gas entering the tower body 41. When the air flows through the thallium removal sedimentation tank 44, water molecules will absorb pollutants in the air, thereby causing them to precipitate into the water. Through the cooperation of the circulation pump 42, the suction pipe 47 and the circulation pipe 43, the solution that absorbs sulfur dioxide is extracted from the bottom of the desulfurization tower, and then sent back to the top of the tower body 41 through the working pressure of the pump to achieve recycling.

[0031] The induced draft device 3 includes a connecting pipe 2 33, the right side of the connecting pipe 2 33 is fixedly connected to the left side of the tower body 2 41, the left side of the connecting pipe 2 33 is fixedly connected to an induced draft fan 32, the left side of the induced draft fan 32 is fixedly connected to a connecting pipe 3 31, and the induced draft fan 32 discharges the exhaust gas after dust removal by the dust removal device 2 into the thallium removal washing device 4 through the connecting pipe 3 31 and the connecting pipe 2 33.

[0032] The dust removal device 2 includes a tower body three 21, which is fixedly connected to the left side of the connecting pipe three 31, a supporting leg 26 is fixedly connected to the bottom of the tower body three 21, an ash hopper 22 is fixedly connected to the bottom of the tower body three 21, a frequency converter 24 is fixedly connected to the bottom of the ash hopper 22, a dust storage device 25 is fixedly connected to the bottom of the ash hopper 22, and a maintenance staircase 23 is fixedly connected to the outer wall of the tower body three 21. The kiln smoke comes from the smoke collecting main pipe 1, which discharges the kiln exhaust gas into the dust removal device 2, and the kiln exhaust gas enters the tower body three 21, and is dusted by the tower body three 21. The removed dust enters the ash hopper 22 and enters the dust storage device 25.

[0033] S1. The kiln flue gas comes from the smoke collecting main pipe 1 and discharges the kiln tail gas into the dust removal device 2. The kiln tail gas enters the tower body 21, and is dusted by the tower body 21. The removed dust enters the ash hopper 22 and enters the dust storage device 25.

[0034] S2, the induced draft fan 32 discharges the tail gas after dust removal by the dust removal device 2 into the thallium removal washing device 4 through the connecting pipe 3 31 and the connecting pipe 2 33.

[0035] S3, the thallium removal washing device 4 removes thallium from the tail gas entering the tower body 2 41. When the air flows through the thallium removal sedimentation tank 44, the water molecules will absorb the pollutants in the air, causing them to precipitate into the water. Through the cooperation of the circulation pump 2 42, the suction pipe 2 47, and the circulation pipe 2 43, the solution that absorbs sulfur dioxide is extracted from the bottom of the desulfurization tower, and then sent back to the top of the tower body 2 41 by the working pressure of the pump to achieve recycling.

[0036] S4. The tail gas enters the desulfurization, denitrification, dust removal and thallium removal device 5 through the connecting pipe 46, passes through the dust removal plate 52 and the filter plate 58, and the tail gas inside the tower body 51 is purified to reach the ultra-low emission index and then directly discharged into the atmosphere through the top chimney 53. Through the cooperation of the circulating pump 54, the suction pipe 59 and the circulating pipe 55, the solution that absorbs sulfur dioxide is extracted from the bottom of the tower body 51, and then sent back to the top of the tower body 51 by the working pressure of the pump to achieve recycling.

[0037] S5, the thallium removal sedimentation tank 44 and the desulfurization, denitrification, dust removal and thallium removal integrated sedimentation tank 56 are sent to the pressure filtration and thallium removal and defluorination device 1 45 and the pressure filtration and thallium removal and defluorination device 2 57 for further treatment to meet the environmental emission standards.

[0038] 1. Integrated desulfurization and denitrification process

[0039] 1. Desulfurization process:

[0040] SO2+NaClO2+2H2O=2H2SO4+NaCl

[0041] H2SO4+2CaOH=Ca2SO4+2H2O

[0042] 2. Denitrification process:

[0043] 4NO+3NaClO2+2H2O=4HNO3+3NaCl

[0044] CaOH+HNO3=CaNO3+H2O

[0045] 3. Thallium removal principle:

[0046] Thallium is a silvery white soft metal with an atomic weight of 204.39, a density of 11.58g / cm3, a melting point of 303.5℃, a boiling point of 1457℃, and is easily oxidized at room temperature and easily soluble in water, nitric acid and sulfuric acid. Its aqueous solution is colorless, tasteless and odorless. Thallium has monovalent and trivalent valences. The latter is unstable and becomes a monovalent compound when it encounters alkali or water, and the toxicity of the monovalent state is much greater than that of the trivalent state. After the metal thallium is washed and sealed for precipitation for a certain period of time, its solution is sent to the thallium removal and fluorine removal device for further treatment.

[0047] The working principle of the utility model is as follows: the kiln smoke comes from the smoke collecting main pipe 1, and the kiln tail gas is discharged into the dust removal device 2, the kiln tail gas enters the tower body 3 21, and the dust is removed by the tower body 3 21. The dust removed enters the ash hopper 22 and enters the dust storage device 25. The induced draft fan 32 discharges the tail gas after the dust removal device 2 through the connecting pipe 3 31 and the connecting pipe 2 33 into the thallium removal washing device 4. The thallium removal washing device 4 removes thallium from the tail gas entering the tower body 2 41. When the air flows through the thallium removal sedimentation tank 44, water molecules will absorb pollutants in the air, so that they are precipitated into the water. After the cooperation of the circulating pump 2 42, the suction pipe 2 47, and the circulating pipe 2 43, the solution that absorbs sulfur dioxide is extracted from the bottom of the desulfurization tower, and then the working pressure of the pump is used to pump the sulfur dioxide out. It is sent back to the top of the tower body 41 for recycling, the exhaust gas enters the desulfurization, denitrification, dust removal and thallium removal device 5 through the connecting pipe 46, passes through the dust removal plate 52 and the filter plate 58, and the exhaust gas inside the tower body 51 is purified to reach the ultra-low emission index and then directly discharged into the atmosphere from the top chimney 53. Through the cooperation of the circulating pump 54, the suction pipe 59 and the circulating pipe 55, the solution that absorbs sulfur dioxide is extracted from the bottom of the tower body 51, and then sent back to the top of the tower body 51 by the working pressure of the pump to achieve recycling. The thallium removal sedimentation tank 44 and the desulfurization, denitrification, dust removal and thallium removal integrated sedimentation tank 56 are sent to the de-filtering, de-thallium removal and defluorination device 45 and the de-filtering, de-thallium removal and defluorination device 2 57 for further treatment to meet the environmental emission standards.

[0048] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An integrated system for desulfurization, denitrification, dust removal and thallium removal for kiln tail gas treatment, characterized in that: include: Smoke collector (1); A dust removal device (2), arranged on the smoke collecting main pipe (1), for filtering dust in the kiln exhaust gas; An air induction device (3) is arranged on the smoke collecting main pipe (1) and is used to discharge the exhaust gas filtered inside the dust removal device (2) into the inside of the thallium removal washing device (4); A thallium removal washing device (4) is arranged on the smoke collecting main pipe (1) and is used for removing thallium from the kiln tail gas; A desulfurization, denitration, dust removal and thallium removal device (5) is arranged on the smoke collecting main pipe (1) and is used for final desulfurization, denitration, dust removal and thallium removal of the kiln tail gas; The desulfurization, denitration, dust removal and thallium removal device (5) comprises a tower body (51), the tower body (51) is arranged on the right side of the smoke collecting main pipe (1), the bottom of the tower body (51) is fixedly connected with a desulfurization, denitration, dust removal and thallium removal integrated sedimentation tank (56), the inner wall of the tower body (51) is fixedly connected with a dust removal plate (52), the right side of the tower body (51) is fixedly connected with a circulation pump (54), the top of the desulfurization, denitration, dust removal and thallium removal integrated sedimentation tank (56) is fixedly connected with a suction pipe (59), and the top of the suction pipe (59) is fixedly connected to the circulation pump (54), the top of the circulation pump (54) is fixedly connected with a circulation pipe (55), and the other end of the circulation pipe (55) is fixedly passed through the tower body (51) and is connected to the inside of the tower body (51).

2. The integrated system for desulfurization, denitrification, dust removal and thallium removal for kiln tail gas treatment according to claim 1 is characterized in that: The top of the tower body (51) is fixedly connected to a chimney (53), the front of the inner wall of the tower body (51) is fixedly connected to a filter plate (58), and the bottom of the desulfurization, denitrification, dust removal and thallium removal integrated sedimentation tank (56) is fixedly connected to a de-pressure filter and sewage thallium and fluorine removal device (57).

3. The integrated system for desulfurization, denitrification, dust removal and thallium removal for kiln tail gas treatment according to claim 1 is characterized in that: The thallium removal and washing device (4) comprises a connecting pipe (46) which is fixedly connected to the left side of the tower body (51); the bottom of the connecting pipe (46) is fixedly connected to the tower body (41); the bottom of the tower body (41) is fixedly connected to a thallium removal sedimentation tank (44); the bottom of the thallium removal sedimentation tank (44) is fixedly connected to a pressure filter and sewage thallium and fluorine removal device (45); the top of the thallium removal sedimentation tank (44) is fixedly connected to a suction pipe (47); the right side of the tower body (41) is fixedly connected to a circulation pump (42); and the top of the suction pipe (47) is fixedly connected to the circulation pump (42).

4. The integrated system for desulfurization, denitrification, dust removal and thallium removal for kiln tail gas treatment according to claim 3 is characterized in that: The top of the second circulating pump (42) is fixedly connected with a second circulating pipe (43), and the other end of the second circulating pipe (43) is fixedly passed through the second tower body (41) and is connected to the inside of the second tower body (41).

5. The integrated system for desulfurization, denitrification, dust removal and thallium removal for kiln tail gas treatment according to claim 1 is characterized in that: The induced draft device (3) comprises a second connecting pipe (33), the right side of the second connecting pipe (33) is fixedly connected to the left side of the second tower body (41), the left side of the second connecting pipe (33) is fixedly connected to an induced draft fan (32), and the left side of the induced draft fan (32) is fixedly connected to a third connecting pipe (31).

6. The integrated system for desulfurization, denitrification, dust removal and thallium removal for kiln tail gas treatment according to claim 5 is characterized in that: The dust removal device (2) comprises a tower body three (21), the tower body three (21) is fixedly connected to the left side of the connecting pipe three (31), the bottom of the tower body three (21) is fixedly connected to a support leg (26), the bottom of the tower body three (21) is fixedly connected to an ash hopper (22), the bottom of the ash hopper (22) is fixedly connected to a frequency converter (24), and the bottom of the ash hopper (22) is fixedly connected to a dust storage device (25).

7. The integrated system for desulfurization, denitrification, dust removal and thallium removal for kiln tail gas treatment according to claim 6 is characterized in that: A maintenance staircase (23) is fixedly connected to the outer wall of the tower body three (21).

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