Flue gas denitration device for rotary kiln

Abstract

The invention discloses a rotary kiln flue gas denitration device, and relates to the technical field of rotary kiln flue gas treatment.The rotary kiln flue gas denitration device comprises an outer furnace body assembly, a centrifugal furnace assembly and a through assembly, a flue gas through pipe is arranged on the inner side of the bottom of the outer furnace body assembly, and a rotating pipe is arranged at the outer end of the top of the flue gas through pipe; a centrifugal furnace assembly is arranged in the outer furnace body assembly. The water inlet pipe is connected with an external water source, when the centrifugal furnace body rotates, a water curtain is sprayed into the furnace through the spraying head, the water curtain makes contact with high-temperature flue gas to achieve cooling and adsorb dust particles, dust-containing water is thrown to the outer wall under the action of centrifugal force, and dust removal is completed synchronously; due to the fact that an ammonia water method with titanium dioxide as a catalyst is adopted for flue gas denitration of the rotary kiln, high temperature easily causes sintering of the catalyst, and the catalytic efficiency can be reduced by dust, according to the design, centrifugal rotation is matched with spraying, the water-gas contact area is enlarged in a single process, the cooling and dust removing effects are enhanced at the same time, and therefore the denitration efficiency and the equipment operation stability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary kiln flue gas treatment, and specifically provides a denitration device for rotary kiln flue gas. Background Art

[0002] With the rapid development of industrial production, as an important high-temperature calcination equipment, the pollution problem of nitrogen oxides in the flue gas emissions of rotary kilns has attracted increasing attention. Selective catalytic reduction technology is a widely used flue gas denitration method at present. It converts nitrogen oxides into harmless nitrogen and water by using a reducing agent (such as ammonia water) under the action of a catalyst. However, in the actual treatment of rotary kiln flue gas, the existing technology still faces the following challenges: Damage to the catalyst by high temperature: The temperature of the flue gas discharged from the rotary kiln is usually relatively high (up to over 300 °C), and the commonly used titanium dioxide (TiO2)-based catalyst in selective catalytic reduction technology is prone to sintering deactivation at high temperatures, resulting in a significant decline in catalytic efficiency.

[0003] Interference of dust on the catalytic reaction: The dust particles carried in the flue gas are easily attached to the surface of the catalyst, forming a covering layer, which hinders the effective contact between the reducing agent and nitrogen oxides and reduces the denitration efficiency.

[0004] Problems of system integration and operation cost: Traditional denitration processes usually require step-by-step flue gas cooling, dust removal, and denitration treatment. The equipment structure is complex and occupies a large area. In addition, the single utilization rate of ammonia water is relatively low, and it needs to be replenished frequently, increasing the operation cost.

[0005] Inconvenience in cleaning and maintenance: The cleaning process of the ammonia water circulation system and the dust removal components in the existing device is cumbersome, and the shutdown maintenance time is long, affecting the production continuity. Summary of the Invention

[0006] The purpose of the present invention is to provide a denitration device for rotary kiln flue gas to solve the problems raised in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A denitration device for rotary kiln flue gas includes an outer furnace body component, a centrifugal furnace component, and a through-connection component. A flue gas pipe is arranged inside the bottom of the outer furnace body component, and a rotating pipe is arranged at the outer end of the top of the flue gas pipe. The centrifugal furnace component is arranged inside the outer furnace body component, and a through-connection component is arranged at the inner top of the centrifugal furnace component. The through-connection component includes a through-connection pipe. The outer end of the through-connection pipe is connected to a water inlet pipe, and a check valve is arranged at the outer end of the water inlet pipe. A spray head is arranged at the end of the water inlet pipe. An air inlet groove is opened at the outer end of the bottom of the through-connection pipe, and a water baffle is arranged at the outer end of the top of the through-connection pipe. An exhaust groove is opened at the inner top of the through-connection pipe. The outer end of the top of the water inlet pipe is connected to a return water pipe. A denitration furnace component is arranged at the outer end of the top of the outer furnace body component.

[0008] Further, the outer furnace body assembly includes an outer furnace body. A rotating track is provided inside the outer furnace body, and a partition is arranged on the inner side of the bottom of the outer furnace body. A waste discharge groove is opened on the inner side of the bottom of the outer furnace body, and a sewage storage cavity is opened on the bottom edge of the outer furnace body. A sewage discharge pipe is connected to the outside of the outer furnace body. A motor is arranged inside the outer furnace body, and a driving gear is connected to the output end of the motor.

[0009] Further, the waste discharge groove communicates with the sewage storage cavity, and the sewage storage cavity communicates with the sewage discharge pipe.

[0010] Further, the centrifugal furnace assembly includes a centrifugal furnace body. A sewage discharge groove is opened at the outer end of the bottom of the centrifugal furnace body, and a driven gear ring is arranged at the outer end of the top of the centrifugal furnace body. A positioning ring is arranged at the outer end of the centrifugal furnace body, and a water blocking partition is arranged inside the centrifugal furnace body.

[0011] Further, the driving gear meshes with the driven gear ring, and the flue gas through pipe is connected to the centrifugal furnace body through a rotating pipe Further, the positioning ring is fixedly connected to the centrifugal furnace body, and the positioning ring is arranged inside the rotating track..

[0012] Further, the through pipe is sleeved and connected to the centrifugal furnace body, and the centrifugal furnace body communicates with the through pipe through an air inlet groove.

[0013] Further, the denitration furnace assembly includes a denitration furnace body. A spraying seat is arranged inside the denitration furnace body, and a liquid inlet pipe is connected to the outer end of the spraying seat. A support seat is arranged between the liquid inlet pipe and the outer furnace body. A reflux groove is opened on the inner side of the bottom of the denitration furnace body. A reflux cavity is arranged at the outer end of the bottom of the denitration furnace body, and an air outlet pipe is connected to the outer end of the top of the denitration furnace body.

[0014] Further, the through pipe communicates with the denitration furnace body through an exhaust groove, and the denitration furnace body is connected to the reflux cavity through the reflux groove.

[0015] Further, the reflux cavity communicates with a return water pipe, and the return water pipe communicates with a water inlet pipe.

[0016] The present invention provides a rotary kiln flue gas denitration device, which has the following beneficial effects: 1. The water inlet pipe of the present invention is connected to an external water source. When the centrifugal furnace body rotates, a water curtain is sprayed into the furnace through a spray head. The water curtain cools down by contacting with high-temperature flue gas and adsorbs dust particles. Under the action of centrifugal force, the dust-containing water body is thrown to the outer wall, and dust removal is completed synchronously. Since the ammonia water method using titanium dioxide as a catalyst is adopted for denitrification of the rotary kiln flue gas, high temperature is likely to cause sintering of the catalyst, and dust will reduce the catalytic efficiency. This design expands the contact area between water and gas and strengthens the cooling and dust removal effects simultaneously in a single process through centrifugal rotation and spraying, thereby improving the denitrification efficiency and the operation stability of the equipment.

[0017] 2. The liquid inlet pipe of the present invention transports ammonia water containing titanium dioxide, which is sprayed into the denitrification furnace body through a spray seat and mixed with the flue gas to achieve denitrification. The treated flue gas is discharged through the outlet pipe. The reacted ammonia water flows along the inner wall of the furnace body into the bottom return tank, converges into the return cavity for temporary storage, and is connected to the water inlet pipe through a return water pipe with a check valve. This design enables the sprayed water in the cooling and dust removal stage to be mixed with ammonia water to achieve pre-denitrification, improving the overall denitrification efficiency. At the same time, the recycling of ammonia water reduces consumption and operating costs.

[0018] 3. The water body after reaction in the centrifugal furnace body of the present invention flows into the bottom sewage tank under the action of centrifugal force and gravity, enters the outer furnace body. The partition restricts the water flow direction and prevents splashing, guiding the sewage to converge into the storage cavity through the waste discharge tank and being centrally discharged through the sewage pipe, ensuring that the flue gas circulation is not disturbed. At the same time, the ammonia water in the denitrification furnace body is recycled to the centrifugal furnace body through the return water pipe. During cleaning, only clean water needs to be injected into the liquid inlet pipe to achieve the cleaning of the entire equipment, significantly improving the equipment cleaning efficiency and operation convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure A of a rotary kiln flue gas denitrification device of the present invention; Figure 2 It is a schematic diagram of the overall structure B of a rotary kiln flue gas denitrification device of the present invention; Figure 3 It is a schematic diagram of the internal structure of the outer furnace body of a rotary kiln flue gas denitrification device of the present invention; Figure 4 It is a schematic diagram of the internal structure of the centrifugal furnace body of a rotary kiln flue gas denitrification device of the present invention; Figure 5 It is a schematic diagram of the internal structure of the denitrification furnace body of a rotary kiln flue gas denitrification device of the present invention; Figure 6 It is a schematic diagram of the overall sectional structure of a rotary kiln flue gas denitrification device of the present invention; Figure 7 It is a schematic diagram of the sectional structure of the through-component of a rotary kiln flue gas denitrification device of the present invention.

[0020] In the figure: 1. Outer furnace body assembly; 101. Outer furnace body; 102. Rotating track; 103. Partition board; 104. Waste discharge groove; 105. Sewage storage cavity; 106. Sewage discharge pipe; 107. Motor; 108. Driving gear; 2. Flue gas pipe; 3. Rotating pipe; 4. Centrifugal furnace assembly; 401. Centrifugal furnace body; 402. Sewage discharge groove; 403. Driven gear ring; 404. Positioning ring; 405. Water baffle; 5. Through-connection assembly; 501. Through-connection pipe; 502. Water inlet pipe; 503. Check valve; 504. Sprinkler head; 505. Air inlet groove; 506. Water baffle; 507. Exhaust groove; 508. Return water pipe; 6. Denitration furnace assembly; 601. Denitration furnace body; 602. Sprinkler seat; 603. Liquid inlet pipe; 604. Support seat; 605. Return flow groove; 606. Return flow cavity; 607. Outlet gas pipe. Detailed implementation manners

[0021] Please refer to Figures 1 to 7 , the present invention provides a technical solution: a rotary kiln flue gas denitration device, which includes an outer furnace body assembly 1, a centrifugal furnace assembly 4 and a through-connection assembly 5. The outer furnace body assembly 1 includes an outer furnace body 101. A rotating track 102 is arranged inside the outer furnace body 101. A partition board 103 is arranged on the inner side of the bottom of the outer furnace body 101. A waste discharge groove 104 is opened on the inner side of the bottom of the outer furnace body 101. A sewage storage cavity 105 is opened on the bottom edge of the outer furnace body 101. A sewage discharge pipe 106 is connected to the outside of the outer furnace body 101. A motor 107 is arranged inside the outer furnace body 101. The output end of the motor 107 is connected to a driving gear 108. The waste discharge groove 104 is communicated with the sewage storage cavity 105, and the sewage storage cavity 105 is communicated with the sewage discharge pipe 106. A flue gas pipe 2 is arranged on the inner side of the bottom of the outer furnace body assembly 1. A rotating pipe 3 is arranged at the outer end of the top of the flue gas pipe 2. A centrifugal furnace assembly 4 is arranged inside the outer furnace body assembly 1. The centrifugal furnace assembly 4 includes a centrifugal furnace body 401. A sewage discharge groove 402 is opened at the outer end of the bottom of the centrifugal furnace body 401. A driven gear ring 403 is arranged at the outer end of the top of the centrifugal furnace body 401. A positioning ring 404 is arranged at the outer end of the centrifugal furnace body 401. A water baffle 405 is arranged inside the centrifugal furnace body 401. The driving gear 108 is meshed with the driven gear ring 403. The flue gas pipe 2 is communicated with the centrifugal furnace body 401 through the rotating pipe 3. The positioning ring 404 is fixedly connected to the centrifugal furnace body 401, and the positioning ring 404 is arranged inside the rotating track 102. The specific operation is as follows. The flue gas pipe 2 can be connected to the rotary kiln, enabling the flue gas during the operation of the rotary kiln to enter the interior of the flue gas pipe 2. The flue gas pipe 2 is internally connected to the centrifugal furnace body 401 through the rotating pipe 3, allowing the flue gas to enter the interior of the centrifugal furnace body 401. After the flue gas enters the interior of the centrifugal furnace body 401, the motor 107 operates to drive the driving gear 108 to rotate. The driving gear 108 can drive the centrifugal furnace body 401 to rotate through meshing with the driven gear ring 403. The positioning ring 404 at the outer end of the centrifugal furnace body 401 is placed in the rotating track 102 inside the outer furnace body 101, which can effectively ensure the rotational stability of the centrifugal furnace body 401.

[0022] Please refer to Figures 1 to 7 , at the inner top end of the centrifugal furnace assembly 4, a through-connection assembly 5 is installed. The through-connection assembly 5 includes a through-connection pipe 501. The outer end of the through-connection pipe 501 is connected to a water inlet pipe 502, and a check valve 503 is installed at the outer end of the water inlet pipe 502. A spray head 504 is provided at the end of the water inlet pipe 502. An air inlet groove 505 is formed at the outer bottom end of the through-connection pipe 501, and a water baffle 506 is installed at the outer top end of the through-connection pipe 501. An exhaust groove 507 is formed at the inner top of the through-connection pipe 501. A return water pipe 508 is connected to the outer top end of the water inlet pipe 502. The through-connection pipe 501 is sleeved and connected to the centrifugal furnace body 401, and the centrifugal furnace body 401 is connected to the through-connection pipe 501 through the air inlet groove 505. The specific operation is as follows. The water inlet pipe 502 can be connected to the water source outside the equipment. During the rotation of the centrifugal furnace body 401, the external water source can be introduced into the spray head 504 through the water inlet pipe 502. The spray head 504 is installed inside the centrifugal furnace body 401, enabling the water curtain sprayed by the spray head 504 to contact the flue gas. After the water curtain contacts the flue gas, it can cool the flue gas. At the same time, the water curtain can contact the suspended particles (dust) in the flue gas. Through the centrifugal action of the centrifugal furnace body 401, the water body carrying dust will move closer to the outer wall of the centrifugal furnace body 401. Through the above operations, the flue gas can be effectively cooled and dust-removed. Since the denitrification of the rotary kiln flue gas usually uses ammonia water mixed with titanium dioxide as a catalyst for denitrification, if the flue gas temperature is too high, it will cause the sintering of titanium dioxide, and too much dust will affect the catalytic effect of the catalyst. By cooling and dust-removing the flue gas before denitrification, the denitrification effect of the flue gas can be effectively improved. By using the centrifugal cooperation of the centrifugal furnace body 401 and spraying, the equipment can achieve the cooling and dust-removing of the flue gas in a single step. The centrifugal force and rotation effect generated by centrifugation can increase the contact range between the water body and the flue gas, thereby enhancing the cooling and dust-removing effects of the flue gas, improving the use stability of the equipment. The water baffle 405 inside the centrifugal furnace body 401 can block the flue gas pipe 2, preventing the water body from entering the flue gas pipe 2. The increased design at the through-connection part of the centrifugal furnace body 401 and the rotating pipe 3 can also effectively prevent the water body from flowing into the flue gas pipe 2.

[0023] Please refer to Figures 1 to 7 , at the outer end of the top of the outer furnace body assembly 1, a denitration furnace assembly 6 is arranged. The denitration furnace assembly 6 includes a denitration furnace body 601. Inside the denitration furnace body 601, a spray seat 602 is arranged. And at the outer end of the spray seat 602, a liquid inlet pipe 603 is connected. Between the liquid inlet pipe 603 and the outer furnace body 101, a support seat 604 is arranged. And at the inner side of the bottom of the denitration furnace body 601, a reflux groove 605 is opened. At the outer end of the bottom of the denitration furnace body 601, a reflux chamber 606 is arranged. And at the outer end of the top of the denitration furnace body 601, an air outlet pipe 607 is connected. The communication pipe 501 is communicated with the denitration furnace body 601 through an exhaust groove 507. And the denitration furnace body 601 is connected with the reflux chamber 606 through the reflux groove 605. The reflux chamber 606 is communicated with a water return pipe 508. And the water return pipe 508 is communicated with a water inlet pipe 502; The specific operation is as follows. The flue gas after cooling can enter the inside of the through pipe 501 through the air inlet groove 505 and enter the inside of the denitration furnace body 601 through the exhaust groove 507. The liquid inlet pipe 603 can connect the ammonia water mixed with titanium dioxide and make the ammonia water spray through the spray seat 602. The spray openings of the spray seat 602 are arranged inside the denitration furnace body 601, which enables the ammonia water to be mixed with the flue gas entering the denitration furnace body 601, thereby realizing the denitration of the flue gas. The use of the water baffle 506 can prevent the ammonia water from entering the through pipe 501 through the exhaust groove 507. The denitrated flue gas can flow out through the outlet pipe 607 and enter the next treatment step. The ammonia water that has reacted with the flue gas will flow down along the inner wall of the denitration furnace body 601. The inner bottom of the denitration furnace body 601 is provided with a reflux groove 605, which enables the ammonia water to enter the reflux chamber 606 through the reflux groove 605 for storage. The reflux chamber 606 is connected to the water inlet pipe 502 through the return water pipe 508. The check valve 503 at the outer end of the return water pipe 508 can effectively prevent the ammonia water from flowing back. Through this design, when the flue gas is cooled and dedusted in the centrifugal furnace body 401, preliminary denitration can be carried out through the water body mixed with ammonia water, which can improve the denitration effect of the equipment. In addition, this design can enable the ammonia water to react fully, which can reduce the overall consumption of ammonia water, thereby reducing the denitration cost of the equipment. The water body that has completed the reaction and cooling in the centrifugal furnace body 401 will flow into the bottom end of the centrifugal furnace body 401 under the action of centrifugal force and gravity. The bottom end of the centrifugal furnace body 401 is provided with a sewage discharge groove 402, which enables the water body to enter the inside of the outer furnace body 101 through the sewage discharge groove 402. A partition plate 103 is arranged on the inner bottom of the outer furnace body 101. Through the blocking of the partition plate 103, the water body can be prevented from splashing everywhere. At the same time, this can also enable the water body to enter the sewage storage cavity 105 through the waste discharge groove 104 for storage. By opening the sewage discharge pipe 106, the sewage stored in the sewage storage cavity 105 can flow out through the sewage discharge pipe 106, which enables the sewage generated during the reaction and cooling process of the equipment to be conveniently discharged without affecting the normal flow of the flue gas. In addition, since the ammonia water during the denitration process of the denitration furnace body 601 flows back to the inside of the centrifugal furnace body 401 through the return water pipe 508, during the cleaning process of the equipment, only by inputting clean water into the liquid inlet pipe 603 can the whole equipment be cleaned, which can greatly improve the cleaning convenience of the equipment.

[0024] In summary, for the rotary kiln flue gas denitration device, during use, first, the flue gas conduit 2 can be connected to the rotary kiln, enabling the flue gas during the operation of the rotary kiln to enter the interior of the flue gas conduit 2. The flue gas conduit 2 is internally connected to the centrifugal furnace body 401 through the rotating pipe 3, allowing the flue gas to enter the interior of the centrifugal furnace body 401. After the flue gas enters the centrifugal furnace body 401, the motor 107 operates to drive the rotation of the driving gear 108. The driving gear 108 can drive the rotation of the centrifugal furnace body 401 through meshing with the driven gear ring 403. The positioning ring 404 at the outer end of the centrifugal furnace body 401 is placed in the rotating track 102 inside the outer furnace body 101, which can effectively ensure the rotational stability of the centrifugal furnace body 401; Then, the water inlet pipe 502 can be connected to the water source outside the equipment. During the rotation of the centrifugal furnace body 401, the external water source can be introduced into the interior of the spray head 504 through the water inlet pipe 502. The spray head 504 is placed inside the centrifugal furnace body 401, enabling the water curtain sprayed by the spray head 504 to contact the flue gas. After the water curtain contacts the flue gas, it can cool the flue gas. At the same time, the water curtain can contact the suspended particles (dust) in the flue gas. Through the centrifugal action of the centrifugal furnace body 401, the water body carrying dust will move closer to the outer wall of the centrifugal furnace body 401. Through the above operations, the flue gas can be effectively cooled and dust removed. Since ammonia water with mixed titanium dioxide as a catalyst is usually used for denitration of rotary kiln flue gas, if the flue gas temperature is too high, it will cause sintering of titanium dioxide, and too much dust will affect the catalytic effect of the catalyst. By cooling and dust removing the flue gas before denitration, the denitration effect of the flue gas can be effectively improved. By using the method of centrifugation of the centrifugal furnace body 401 in combination with spraying, the equipment can achieve the cooling and dust removal of the flue gas in a single step. The centrifugal force and rotation effect generated by centrifugation can increase the contact range between the water body and the flue gas, thereby enhancing the cooling and dust removal effects of the flue gas, which improves the use stability of the equipment. The water baffle 405 inside the centrifugal furnace body 401 can block the flue gas conduit 2, which can prevent the water body from entering the flue gas conduit 2. The design of increasing the connection height between the centrifugal furnace body 401 and the rotating pipe 3 can also effectively prevent the water body from flowing into the flue gas conduit 2; Subsequently, the flue gas after cooling can enter the interior of the through pipe 501 through the air inlet groove 505 and enter the interior of the denitration furnace body 601 through the exhaust groove 507. The liquid inlet pipe 603 can connect the ammonia water mixed with titanium dioxide and make the ammonia water spray through the spray seat 602. The spray openings of the spray seat 602 are arranged inside the denitration furnace body 601, which enables the ammonia water to be mixed with the flue gas entering the denitration furnace body 601, thereby realizing the denitration of the flue gas. The use of the water baffle 506 can prevent the ammonia water from entering the through pipe 501 through the exhaust groove 507. The denitrated flue gas can flow out through the outlet pipe 607 and enter the next treatment step. The ammonia water that has reacted with the flue gas will flow down along the inner wall of the denitration furnace body 601. A reflux groove 605 is opened on the inner side of the bottom of the denitration furnace body 601, which enables the ammonia water to enter the reflux cavity 606 through the reflux groove 605 for storage. The reflux cavity 606 is connected to the water inlet pipe 502 through the return water pipe 508. The check valve 503 at the outer end of the return water pipe 508 can effectively prevent the ammonia water from flowing back. Through this design, when the flue gas is cooled and dust removed in the centrifugal furnace body 401, preliminary denitration can be carried out through the water body mixed with ammonia water, which can improve the denitration effect of the equipment. In addition, this design can enable the ammonia water to be fully reacted, which can reduce the overall consumption of ammonia water, thereby reducing the denitration cost of the equipment; Finally, the water body that has completed the reaction and cooling in the centrifugal furnace body 401 will flow into the bottom end of the centrifugal furnace body 401 under the action of centrifugal force and gravity. A sewage discharge groove 402 is opened at the bottom end of the centrifugal furnace body 401, which enables the water body to enter the interior of the outer furnace body 101 through the sewage discharge groove 402. A partition plate 103 is arranged on the inner side of the bottom of the outer furnace body 101. Through the blockage of the partition plate 103, the water body can be prevented from splashing everywhere. At the same time, this can also enable the water body to enter the sewage storage cavity 105 through the waste discharge groove 104 for storage. By opening the sewage discharge pipe 106, the sewage stored in the sewage storage cavity 105 can flow out through the sewage discharge pipe 106, which enables the sewage generated during the reaction and cooling process of the equipment to be conveniently discharged without affecting the normal flow of the flue gas. In addition, since the ammonia water during the denitration process of the denitration furnace body 601 flows back to the interior of the centrifugal furnace body 401 through the return water pipe 508, during the cleaning process of the equipment, only by inputting clean water into the liquid inlet pipe 603, the whole equipment can be cleaned, which can greatly improve the cleaning convenience of the equipment.

[0025] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or device.

[0026] In this text, specific examples are used to illustrate the principles and implementation manners of the present invention. The description of the above examples is only for helping to understand the method and its core idea of the present invention. The above description is only the preferred implementation manner of the present invention. It should be noted that due to the limited nature of literal expression and objectively infinite specific structures, for those of ordinary skill in the art in this technical field, without departing from the principles of the present invention, several improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the concept and technical solution of the invention to other occasions without improvement, shall all be regarded as the protection scope of the present invention.

Claims

1. A rotary kiln flue gas denitration device, characterized in that, It includes an outer furnace body assembly (1), a centrifugal furnace assembly (4) and a through-connection assembly (5). A flue gas pipe (2) is arranged inside the bottom of the outer furnace body assembly (1), and a rotating pipe (3) is arranged at the outer end of the top of the flue gas pipe (2). The centrifugal furnace assembly (4) is arranged inside the outer furnace body assembly (1), and the through-connection assembly (5) is arranged at the inner top end of the centrifugal furnace assembly (4). The through-connection assembly (5) includes a through-connection pipe (501). A water inlet pipe (502) is connected to the outer end of the through-connection pipe (501), and a check valve (503) is arranged at the outer end of the water inlet pipe (502). A spray head (504) is arranged at the end of the water inlet pipe (502). An air inlet groove (505) is opened at the outer end of the bottom of the through-connection pipe (501), and a water baffle (506) is arranged at the outer end of the top of the through-connection pipe (501). An exhaust groove (507) is opened at the inner top of the through-connection pipe (501). A return water pipe (508) is connected to the outer end of the top of the water inlet pipe (502). A denitration furnace assembly (6) is arranged at the outer end of the top of the outer furnace body assembly (1).

2. The denitration device for rotary kiln flue gas according to claim 1, characterized in that, The outer furnace body assembly (1) includes an outer furnace body (101). A rotating track (102) is arranged inside the outer furnace body (101), and a partition (103) is arranged inside the bottom of the outer furnace body (101). A waste discharge groove (104) is opened at the inner bottom of the outer furnace body (101). A sewage storage cavity (105) is opened at the bottom edge of the outer furnace body (101), and a sewage discharge pipe (106) is connected to the outside of the outer furnace body (101). A motor (107) is arranged inside the outer furnace body (101), and a driving gear (108) is connected to the output end of the motor (107).

3. A rotary kiln flue gas denitration device according to claim 2, characterized in that, The waste discharge groove (104) is communicated with the sewage storage cavity (105), and the sewage storage cavity (105) is communicated with the sewage discharge pipe (106).

4. A rotary kiln flue gas denitration device according to claim 2, characterized in that, The centrifugal furnace assembly (4) includes a centrifugal furnace body (401). A sewage discharge groove (402) is opened at the outer end of the bottom of the centrifugal furnace body (401), and a driven gear ring (403) is arranged at the outer end of the top of the centrifugal furnace body (401). A positioning ring (404) is arranged at the outer end of the centrifugal furnace body (401), and a water baffle partition (405) is arranged inside the centrifugal furnace body (401).

5. A rotary kiln flue gas denitration device according to claim 4, characterized in that, The driving gear (108) meshes with the driven gear ring (403), and the flue gas pipe (2) is communicated with the centrifugal furnace body (401) through the rotating pipe (3).

6. The rotary kiln flue gas denitration device according to claim 4, wherein, The positioning ring (404) is fixedly connected to the centrifugal furnace body (401), and the positioning ring (404) is arranged inside the rotating track (102).

7. A rotary kiln flue gas denitration device according to claim 4, characterized in that, The through-connection pipe (501) is sleeved and connected to the centrifugal furnace body (401), and the centrifugal furnace body (401) is communicated with the through-connection pipe (501) through the air inlet groove (505).

8. The rotary kiln flue gas denitration device according to claim 2, characterized in that, The denitration furnace assembly (6) includes a denitration furnace body (601). A spray seat (602) is arranged inside the denitration furnace body (601), and a liquid inlet pipe (603) is connected to the outer end of the spray seat (602). A support seat (604) is arranged between the liquid inlet pipe (603) and the outer furnace body (101). A reflux groove (605) is formed in the inner side of the bottom of the denitration furnace body (601). A reflux cavity (606) is arranged at the outer end of the bottom of the denitration furnace body (601). An air outlet pipe (607) is connected to the outer end of the top of the denitration furnace body (601).

9. A rotary kiln flue gas denitration device according to claim 8, characterized in that, The through pipe (501) is communicated with the denitration furnace body (601) through an exhaust groove (507), and the denitration furnace body (601) is communicated with the reflux cavity (606) through a reflux groove (605).

10. A rotary kiln flue gas denitration device according to claim 8, characterized in that, The reflux cavity (606) is communicated with a return water pipe (508), and the return water pipe (508) is communicated with a water inlet pipe (502).

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