A pulse-type steam pyrolysis and denitrification co-processing waste incineration flue gas purification device and its application method

Abstract

This invention provides a pulse-type steam pyrolysis and denitrification synergistic waste incineration flue gas purification device and its usage method, including a main tank component, a steam pyrolysis component, a denitrification component, an exhaust filter component, and an intake cutting component. A steam tank is fixed inside the main tank component, and a denitrification catalytic chamber is formed between the outer wall of the steam tank and the inner wall of the main tank component. An elastically downward-facing cover is arranged and slidably connected within the denitrification catalytic chamber. The cover on the same side is aligned with the U-shaped tube, forming an elastic closure of the U-shaped tube outlet. Only after the flue gas in the steam tank accumulates to a certain level can the cover be pushed open, releasing the pyrolyzed flue gas into the denitrification catalytic chamber, forming a pulse-type transfer of the flue gas. When the annular cover rotates, it not only drives the exhaust filter element to rotate but also drives the rotation of the dividing mesh through the engagement of the active and passive bevel gears. This improves the efficiency of the exhaust filter element while simultaneously dividing the entire flue gas stream, thereby increasing the steam pyrolysis efficiency.

Description

Technical Field

[0001] This invention relates to the field of waste incineration flue gas treatment technology, and in particular to a pulse-type steam pyrolysis and denitrification synergistic waste incineration flue gas purification device and its usage method. Background Technology

[0002] Municipal solid waste incineration offers advantages such as volume reduction, resource recovery, and harmless treatment, and has become one of the main methods for municipal solid waste disposal in my country. However, the incineration process produces flue gas with complex compositions, including nitrogen oxides (NOx). x NO and dioxins are two of the most concerning persistent organic pollutants. x Dioxins are precursors to acid rain and photochemical smog, and their emissions are strictly limited by national standards due to their strong carcinogenic, teratogenic, and immunotoxic properties. Therefore, developing efficient, stable, and economical flue gas co-purification technologies is crucial for the sustainable development of waste-to-energy incineration.

[0003] The most widely used dioxins and NO are currently x The control technology is "activated carbon injection + bag filter". Its principle is to inject a large amount of activated carbon powder with a huge specific surface area into the flue gas, utilizing its strong adsorption capacity to remove dioxins and NO from the gas phase. x The molecules are adsorbed and fixed, and then the dust collector removes the particles carrying dioxins and NO. x The activated carbon fly ash is captured. This method is essentially a "transfer technology," transferring pollutants from the flue gas to the solid fly ash without decomposing them. Subsequent special treatments (such as high-temperature melting or secure landfill) that pose environmental pollution risks are still required, effectively resulting in secondary pollution and risk transfer. Summary of the Invention

[0004] The purpose of this invention is to provide a pulsed steam pyrolysis and denitrification co-processing waste incineration flue gas purification device. By utilizing the combination of the elastically closed cover and the U-shaped tube outlet, the pressure of the flue gas in the steam tank can be used to intermittently push the cover, forming a pulsed transfer of flue gas from the steam chamber to the denitrification catalytic chamber, thus efficiently carrying out steam pyrolysis for SCR denitrification catalytic reduction reaction.

[0005] The objective of this invention is achieved through the following technical solution: a pulse-type steam pyrolysis and denitrification synergistic waste incineration flue gas purification device, comprising a main tank component, a steam pyrolysis component, a denitrification component, and an exhaust filtration component. The steam pyrolysis component includes a flue gas inlet pipe, a spiral pipe, and packing material. The denitrification component includes a catalytic module. The exhaust filtration component includes an exhaust duct, an annular cover, and an exhaust filter element.

[0006] A steam tank is fixedly installed in the middle of the main tank body component. An inner support cylinder is fixedly connected to the middle of the steam tank. A steam chamber is formed between the outer wall of the inner support cylinder and the inner wall of the steam tank. A spiral tube is fixed in the steam chamber. Packing fills the steam chamber except for the spiral tube. Exhaust micro-holes are evenly opened on both the inner and outer sides of the spiral tube. U-shaped tubes are arranged and connected at the bottom of the steam tank. A denitrification catalytic chamber is formed between the outer wall of the steam tank and the inner wall of the main tank body. A flexible downward-facing cap is arranged and connected in sliding connection in the denitrification catalytic chamber. The cap on the same side is directly opposite the position of the U-shaped tube.

[0007] The top of the steam tank has air vents, and the flared end of the flue gas inlet pipe is fixed to the outer top of the steam tank.

[0008] The catalytic module is located inside the denitrification catalytic chamber. An annular seat is connected to the upper end of the outer wall of the main tank. The annular seat is connected to the upper end of the denitrification catalytic chamber through evenly distributed exhaust pipes. An annular cover is screwed onto the upper end of the annular seat. The annular cover can rotate automatically. The exhaust filter element is fixed to the annular cover and is located in the inner cavity of the annular seat.

[0009] The process of using the technical solution of the present invention is as follows:

[0010] The external steam supply system can continuously supply steam to the spiral tube. The steam can diffuse into the packing through the exhaust micropores opened inside and outside the spiral tube. The external flue gas to be treated can enter the steam chamber from the flue gas inlet pipe.

[0011] The packing has a large specific surface area, which can increase the contact area between flue gas and steam;

[0012] Under the reducing atmosphere created by steam in a suitable temperature field, dioxin-like pollutants in flue gas undergo molecular chain breakage and are efficiently decomposed into small molecule harmless substances and nitrogen oxides.

[0013] The catalytic module contains a catalyst that can undergo a catalytic reduction reaction with nitrogen oxides;

[0014] Furthermore, since each U-shaped tube outlet is covered with an elastically closed cap, the downward elastic force of the cap itself allows the outlet of the U-shaped tube to open only after the flue gas in the steam chamber has accumulated to a certain level. After the flue gas in the steam chamber is released into the denitrification catalytic chamber, the pressure in the steam chamber decreases, and the cap returns to the elastically closed state. This cycle can complete the pulse-like flow of flue gas from the steam chamber to the denitrification catalytic chamber.

[0015] After the above two-stage purification, dioxins and nitrogen oxides in the flue gas are efficiently removed. The purified flue gas enters the cavity composed of the annular seat and annular cover through each set of exhaust pipes, and is filtered again by the exhaust filter element before being discharged in compliance with standards.

[0016] Another objective of this invention is to provide a method for using a pulse-type steam pyrolysis and denitrification synergistic waste incineration flue gas purification device, comprising the following steps:

[0017] S1. Pyrolysis of flue gas: The flue gas to be treated can enter the steam chamber formed between the outer wall of the inner support cylinder and the inner wall of the steam tank through the flue gas inlet pipe. The external steam supply system can continuously supply steam to the spiral tube. The steam can diffuse from the exhaust micropores opened inside and outside the spiral tube into the packing in the steam chamber to perform steam pyrolysis treatment on the flue gas. The dioxin-like pollutants in the flue gas undergo molecular chain breakage and are efficiently decomposed into small molecule harmless substances and nitrogen oxides.

[0018] S2. SCR denitrification treatment of steam: A denitrification catalytic chamber is formed between the outer wall of the steam tank and the inner wall of the main tank. The denitrification catalytic chamber is equipped with a catalytic module containing a catalyst, which can undergo a catalytic reduction reaction with nitrogen oxides in the flue gas. When the flue gas pressure in the steam chamber is sufficient to push open the cover, the flue gas pyrolyzed by the steam will diffuse from the U-shaped tube into the denitrification catalytic chamber and react with the catalyst in the catalytic module to efficiently remove dioxins and nitrogen oxides from the flue gas.

[0019] S3. Emission of purified flue gas: The purified flue gas enters the cavity composed of the annular seat and the annular cover through each set of exhaust pipes. As the annular cover drives the exhaust filter element to rotate, the flue gas is efficiently filtered by the exhaust filter element and then discharged in compliance with standards.

[0020] By adopting the above technical solution, the present invention can achieve the following beneficial effects:

[0021] (1) The downward support elastic force of the cap itself forms an elastic closed state at the outlet of the U-shaped tube, which allows the flow channel between the steam chamber and the denitrification catalytic chamber to form a pressure self-regulating setting. This not only provides a stable and controllable reducing atmosphere and sufficient residence time for steam pyrolysis, but also forms a pulsed flow of flue gas from the steam chamber to the denitrification catalytic chamber. When the outlet of the U-shaped tube opens under sufficient pressure, a high-speed, concentrated flue gas will enter the denitrification catalytic chamber. This pulsed jet has a stronger turbulence effect than a continuous and stable airflow, which can more violently agitate the flue gas in the denitrification catalytic chamber. The strong turbulence helps to fully integrate the pyrolysis flue gas from upstream with the catalyst carried in the catalytic module.

[0022] (2) Furthermore, the downward supporting elastic force of the cap itself forms an elastic closed state at the outlet of the U-shaped tube, which can also form a self-regulating ability. When the waste incineration load increases and the amount of flue gas generated increases, the pressure in the steam chamber accumulates faster, the opening frequency of the U-shaped tube outlet naturally increases, and the amount of flue gas entering the denitrification catalytic chamber per unit time increases, and vice versa. This design makes the steam chamber a buffer device, which can absorb the instantaneous fluctuations in flue gas volume and pressure caused by fluctuations in incineration conditions (such as feeding and stirring), providing a relatively stable processing load for the downstream denitrification catalytic system and enhancing the adaptability of the entire purification system to upstream fluctuations. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the external structure of the main tank component of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the steam pyrolysis assembly of the present invention;

[0027] Figure 4 This is a schematic diagram of the steam tank portion of the present invention;

[0028] Figure 5 This is a schematic diagram of the internal structure of the steam tank of the present invention;

[0029] Figure 6 This is a schematic diagram of the conical guide head portion of the present invention;

[0030] Figure 7 This is a schematic diagram of the denitrification component of the present invention;

[0031] Figure 8 This is a schematic diagram of the installation structure of the catalytic module of the present invention;

[0032] Figure 9 This is a schematic diagram of the connection between the annular seat and the main tank body of the present invention;

[0033] Figure 10 This is a schematic diagram of the transmission part of the exhaust filter assembly of the present invention;

[0034] Figure 11 This is a schematic diagram of the exhaust filter assembly of the present invention;

[0035] Figure 12 This is a schematic diagram showing the positional relationship between the segmentation mesh and the eccentric tube in this invention.

[0036] Figure 13 This is a cross-sectional schematic diagram of the dividing disk and dividing mesh of the present invention.

[0037] Reference numerals: 1. Main tank body component; 2. Steam pyrolysis assembly; 3. Denitrification assembly; 4. Exhaust filtration assembly; 5. Inlet cutting assembly; 101. Main tank body; 102. Tank cover; 201. Steam tank; 202. Bottom fixed sleeve; 203. Top fixed sleeve; 204. U-shaped pipe; 205. Cover; 206. Guide column; 207. Slide seat; 208. Connecting sleeve; 209. Flue gas inlet pipe; 210. Steam inlet pipe; 211. Steam outlet pipe; 212. Inner support cylinder; 213. Spiral tube; 214. Exhaust micropores; 215. Packing; 216. Exhaust hole; 217. Conical guide head; 218. Compression spring; 301. Central fixed sleeve; 302. Air intake grille; 303. Vertical partition plate; 304. Insert plate; 305. Catalytic converter module; 401. Exhaust duct; 402. Annular seat; 403. Annular cover; 404. Exhaust port; 405. Exhaust filter element; 406. Rotary frame; 407. Fixed rotary seat; 408. Rotary sleeve; 409. Central gear; 410. Drive motor; 411. Drive gear; 501. Fixed frame; 502. Divider plate; 503. Divider mesh; 504. Passive bevel gear; 505. Active bevel gear; 506. Centrifugal fan; 507. Eccentric tube. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0039] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] like Figures 1-13As shown, a pulse-type steam pyrolysis and denitrification co-processing waste incineration flue gas purification device includes a main tank 101 as the main body of the main tank component 1. A steam tank 201 is fixedly installed in the center of the main tank 101. An inner support cylinder 212 is fixedly connected to the center of the steam tank 201. A steam chamber is formed between the outer wall of the inner support cylinder 212 and the inner wall of the steam tank 201. A spiral tube 213 is fixedly installed in the steam chamber and connected to an external steam supply system. Packing material 215 fills the steam chamber except for the spiral tube. Outside of position 213, the inner and outer sides of the spiral tube 213 are evenly provided with exhaust micro-holes 214. The bottom of the steam tank 201 is connected to a U-shaped tube 204 and communicates with the steam chamber. A denitrification catalytic chamber is formed between the outer wall of the steam tank 201 and the inner wall of the main tank 101. A downwardly elastic cover 205 is arranged and connected in the denitrification catalytic chamber. The cover 205 on the same side is directly opposite the U-shaped tube 204, which can open and close the outlet of the U-shaped tube 204.

[0041] The top of the steam tank 201 is provided with vent holes 216. The flared end of the flue gas inlet pipe 209 is fixed to the outer top of the steam tank 201, and the vent holes 216 are only connected to the steam chamber. Flue gas can enter the steam chamber from the flue gas inlet pipe 209.

[0042] The catalytic module 305 is located inside the denitrification catalytic chamber and will not interfere with the movement of the cap 205. The upper end of the outer wall of the main tank 101 is connected to an annular seat 402, and the annular seat 402 is connected to the upper end of the denitrification catalytic chamber through a uniformly distributed exhaust pipe 401. An annular cover 403 is screwed onto the upper end of the annular seat 402, and the annular cover 403 can rotate automatically. The exhaust filter element 405 is fixed to the annular cover 403 and is located in the inner cavity of the annular seat 402.

[0043] The working principle is as follows:

[0044] The external steam supply system can continuously supply steam to the spiral tube 213. The steam can diffuse from the exhaust micro-holes 214 opened inside and outside the spiral tube 213 into the packing 215. The external flue gas to be treated can enter the steam chamber from the flue gas inlet pipe 209.

[0045] The packing material 215 has a large specific surface area, which can increase the contact area between flue gas and steam, allowing the flue gas and steam to be fully mixed.

[0046] Under the reducing atmosphere created by steam in a suitable temperature field, dioxin-like pollutants in flue gas undergo molecular chain breakage and are efficiently decomposed into small molecule harmless substances and nitrogen oxides.

[0047] Catalytic module 305 contains an SCR catalyst, which can undergo a catalytic reduction reaction with nitrogen oxides. Under the action of the catalyst, nitrogen oxides (NOx) in the flue gas are reduced. xA catalytic reduction reaction occurs, producing harmless nitrogen (N2) and water (H2O).

[0048] The main chemical reaction is: NO + NO₂ + 2NH₃ → 2N₂ + 3H₂O

[0049] Furthermore, since each U-shaped tube 204 outlet is covered with an elastically closed cap 205, the downward elastic force of the cap 205 itself allows the outlet of the U-shaped tube 204 to open only after the flue gas in the steam chamber has accumulated to a certain extent. After the flue gas in the steam chamber is released into the denitrification catalytic chamber, the pressure in the steam chamber decreases, and the cap 205 returns to the elastically closed state. This cycle can complete the pulse-like flow of flue gas from the steam chamber to the denitrification catalytic chamber, which can provide sufficient residence time for the steam pyrolysis reaction in the steam chamber and improve the catalytic reduction reaction in the denitrification catalytic chamber.

[0050] After the above two-stage purification, dioxins and nitrogen oxides in the flue gas are efficiently removed. The purified flue gas enters the cavity composed of the annular seat 402 and the annular cover 403 through each set of exhaust pipes 401, and is filtered again by the exhaust filter element 405 before being discharged out in compliance with standards.

[0051] Furthermore, since the annular seat 402, the annular cover 403, and the exhaust filter element 405 are mutually matched circular structures, and the area of ​​the connection position between the exhaust duct 401 and the annular seat 402 is limited, the rotation of the exhaust filter element 405 driven by the annular cover 403 can greatly increase the usable area of ​​the exhaust filter element 405 and improve its utilization efficiency.

[0052] The specific structures of the main tank component 1 and the steam pyrolysis assembly 2 are as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the main tank 101 serves as the main processing unit, and the tank cover 102 is attached to the top of the main tank 101.

[0053] The upper and lower ends of the outer wall of the steam tank 201 are respectively fixed with a top fixed sleeve 203 and a bottom fixed sleeve 202. Both the top fixed sleeve 203 and the bottom fixed sleeve 202 are fixed to the inner wall of the main tank body 101. The main body of the U-shaped tube 204 is fixed to the bottom fixed sleeve 202.

[0054] The bottom end of the connecting sleeve 208 is fixed with guide posts 206, the top end of the cover 205 is fixedly connected to the bottom end of the guide posts 206, and the main body of the top fixed sleeve 203 is fixedly installed with a slide block 207, and the guide posts 206 on the same side are slidably connected to the slide block 207.

[0055] A compression spring 218 is arranged and fixedly connected between the top end of the connecting sleeve 208 and the bottom end of the inner cavity of the can cover 102. The compression spring 218 can push the connecting sleeve 208 downward, so that the cover 205, which is fixed to the connecting sleeve 208 through the guide post 206, forms a downward elastic closed state for the outlet of the U-shaped tube 204.

[0056] The bottom inlet end of the spiral tube 213 is connected to a steam inlet pipe 210, and the outlet end is connected to a steam outlet pipe 211. The steam inlet pipe 210 and the steam outlet pipe 211 are connected to an external steam supply system to form a loop connection, which can circulate steam to the spiral tube 213.

[0057] A conical guide head 217 with a tower-shaped structure is fixed at the middle of the outer top of the steam tank 201. It is used to guide the flue gas entering from the flue gas inlet pipe 209 so that it can enter the steam chamber more smoothly through the gas passage 216.

[0058] The specific structure of the denitrification component 3 is as follows: Figure 7 and Figure 8 As shown, the middle fixed sleeve 301 is fixed between the middle of the outer wall of the steam tank 201 and the inner wall of the main tank 101. The air inlet grille 302 is arranged and opened in the main body of the middle fixed sleeve 301. The slide seat 207 is also arranged and fixedly installed in the main body of the middle fixed sleeve 301 for sliding connection with the guide post 206.

[0059] A plug-in plate 304 is arranged and fixed at the bottom of the top fixed sleeve 203, and a vertical partition plate 303 is arranged and fixed at the top of the middle fixed sleeve 301. The vertical partition plate 303 on the same side is plugged into the plug-in plate 304 to evenly divide the cavity formed between the middle fixed sleeve 301 and the top fixed sleeve 203. A catalyst module 305 is installed in each cavity separated by the vertical partition plate 303 and the plug-in plate 304 between the middle fixed sleeve 301 and the top fixed sleeve 203.

[0060] When the flue gas pressure in the steam chamber is high enough to open the downward elastically closed cover 205, the flue gas in the steam chamber will pass upward through the U-shaped pipe 204 and through the air intake grille 302 to contact the catalytic module 305 and form a catalytic reduction reaction.

[0061] Furthermore, the guide post 206 is positioned directly opposite the vertical partition 303 and the plug-in plate 304. The vertical partition 303 and the plug-in plate 304 are hollow structures and will not interfere with the up-and-down movement of the guide post 206.

[0062] The specific structures of the exhaust filter assembly 4 and the intake air cutting assembly 5 are as follows: Figure 9 , Figure 10 , Figure 11 and Figure 12 As shown, exhaust holes 404 are arranged at the top of the main body of the annular cover 403 for releasing purified and compliant flue gas into the environment.

[0063] The bottom end of the rotating frame 406 is fixedly connected to the top end of the annular cover 403. A fixed rotating seat 407 is fixedly installed on the outer surface of the main body of the flue gas inlet pipe 209. A rotating sleeve 408 is fixedly installed in the middle of the top end of the rotating frame 406. The rotating sleeve 408 is spun to the fixed rotating seat 407.

[0064] A drive motor 410 is installed in the motor position opened in the main body of the can lid 102. A drive gear 411 is inserted in the rotating shaft of the drive motor 410, and a central gear 409 is inserted in the sleeve 408 and meshes with the drive gear 411.

[0065] By starting the drive motor 410 to drive the drive gear 411 to rotate, the drive gear 411 can form a transmission with the center gear 409, which drives the rotating frame 406 and the rotating sleeve 408 to rotate around the fixed rotating seat 407 as a reference. The annular seat 402 is concentrically set with the fixed rotating seat 407, which can drive the annular cover 403 and the exhaust filter element 405 to rotate relative to the annular seat 402. This allows different positions of the exhaust filter element 405 to contact the outlet end of the exhaust duct 401, thereby increasing the filtration efficiency of the exhaust filter element 405 while increasing the usable area of ​​the exhaust filter element 405.

[0066] The air intake cutting assembly 5 can pre-cut and crush the flue gas particles entering the flue gas inlet pipe 209 to improve the performance of the steam pyrolysis system. The frame 501 is fixed to the outer surface of the main body of the flue gas inlet pipe 209. The outer side of the dividing plate 502 is fixed to one end of the main body of the frame 501. The dividing mesh 503 is screwed into the cavity wall of the dividing plate 502 and can rotate continuously and freely.

[0067] The top of the rotating frame 406 is fixed with a driving bevel gear 505, and the outer circular surface of the dividing net 503 is fixed with a driven bevel gear 504, which meshes with the driving bevel gear 505.

[0068] Eccentric pipes 507 are fixed to the eccentric ends of both sides of the dividing plate 502. The eccentric pipe 507 on one side of the dividing plate 502 is connected to the inlet of the flue gas inlet pipe 209, and the eccentric pipe 507 on the other side is connected to the outlet of the centrifugal fan 506. The bottom of the main body of the centrifugal fan 506 is fixed to the frame 501. The inlet of the centrifugal fan 506 is connected to the external flue gas input pipe for inputting the flue gas to be treated into the steam chamber.

[0069] Furthermore, when the rotating frame 406 rotates, the active bevel gear 505 and the passive bevel gear 504 can be used to drive the dividing net 503 to rotate in the inner cavity of the dividing disk 502.

[0070] Since the area of ​​the dividing mesh 503 is larger than the cross-sectional area of ​​the eccentric tube 507, when the dividing mesh 503 rotates, it can improve the cutting efficiency of the dividing mesh 503 on the flue gas while increasing the usable area of ​​the dividing mesh 503.

[0071] The segmentation mesh 503 cuts the concentrated, large streams of high-speed flue gas, breaking them into countless small streams of flue gas. This forces the flue gas to flow evenly through the cross-section of the flue gas inlet pipe 209, rather than concentrating in the central area. This ensures that the flue gas can evenly fill the entire reaction space when it enters the steam chamber, avoiding the formation of dead zones at the corners or bottom of the steam chamber, eliminating blind spots in the treatment, and ensuring the stability of the treatment effect.

[0072] As is common technical knowledge, the connection points of components involving airtightness mentioned above are all equipped with gaskets, and bearings are installed at locations where there is a risk of rotational wear.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pulse steam pyrolysis and denitration synergistic waste incineration flue gas purification device, comprising a main tank body component (1) and a steam pyrolysis assembly (2), characterized in that: The de-nitration assembly (3) and the exhaust gas filtering assembly (4) are further included. The main tank body member (1) comprises a main tank body (101), the steam pyrolysis assembly (2) comprises a flue gas inlet pipe (209), a spiral pipe (213) and a filler (215), the inner middle part of the main tank body (101) is fixedly provided with a steam tank (201), the inner middle part of the steam tank (201) is fixedly connected with an inner support cylinder (212), a steam cavity is formed between the outer wall of the inner support cylinder (212) and the inner wall of the steam tank (201), the spiral pipe (213) is fixedly arranged in the steam cavity, the filler (215) is filled in the steam cavity except the spiral pipe (213), the inner and outer surfaces of the pipeline of the spiral pipe (213) are uniformly provided with steam exhaust micro-holes (214), the bottom of the steam tank (201) is connected with a U-shaped pipe (204), the outer wall of the steam tank (201) and the inner wall of the main tank body (101) form a de-nitration catalysis cavity, the de-nitration catalysis cavity is slidably connected with an elastic downward cover (205), the covers (205) on the same side are opposite to the U-shaped pipe (204), the top of the steam tank (201) is provided with a gas passing hole (216), and the flared end of the bottom of the flue gas inlet pipe (209) is fixedly connected with the outer top of the steam tank (201). The de-nitration assembly (3) comprises a catalysis module (305), the exhaust gas filtering assembly (4) comprises an exhaust gas guide pipe (401), an annular cover (403) and an exhaust gas filter element (405), the catalysis module (305) is arranged in the de-nitration catalysis cavity, the outer wall of the main tank body (101) is connected with an annular seat (402) at the upper end, the annular seat (402) is communicated with the upper end of the de-nitration catalysis cavity through the uniformly distributed exhaust gas guide pipes (401), the upper end of the annular seat (402) is screwed with the annular cover (403), the annular cover (403) can automatically rotate, the exhaust gas filter element (405) is fixedly connected with the annular cover (403) and is arranged in the inner cavity of the annular seat (402).

2. The device according to claim 1, characterized in that: The main tank body member (1) further comprises a tank cover (102), the tank cover (102) is connected to the top end of the main tank body (101).

3. The device according to claim 2, characterized in that: The steam pyrolysis assembly (2) further comprises a connecting sleeve (208), the upper and lower ends of the outer wall of the steam tank (201) are respectively fixedly provided with a top fixing sleeve (203) and a bottom fixing sleeve (202), the top fixing sleeve (203) and the bottom fixing sleeve (202) are fixedly connected with the inner wall of the main tank body (101), the main body of the U-shaped pipe (204) is fixedly connected with the bottom fixing sleeve (202), the bottom end of the connecting sleeve (208) is fixedly provided with a guide column (206), the top end of the cover (205) is fixedly connected with the bottom end of the guide column (206), the main body of the top fixing sleeve (203) is fixedly provided with a sliding seat (207), the guide columns (206) on the same side are slidably connected with the sliding seat (207), the top end of the connecting sleeve (208) and the bottom end of the inner cavity of the tank cover (102) are fixedly and connected with a compression spring (218), the bottom inlet end of the spiral pipe (213) is connected with a steam inlet pipe (210), and the outlet end is connected with a steam outlet pipe (211).

4. The device according to claim 1, 2 or 3, characterized in that: The outer top middle part of the steam tank (201) is further fixedly provided with a conical guide head (217).

5. The device according to claim 3, characterized in that: The denitration assembly (3) further comprises a middle fixed sleeve (301) and an air inlet grille (302), the middle fixed sleeve (301) is fixedly connected between the middle part of the outer wall of the steam tank (201) and the inner wall of the main tank body (101), the air inlet grille (302) is arranged and opened in the main body of the middle fixed sleeve (301), the bottom end of the top fixed sleeve (203) is arranged and fixed with a plug-in plate (304), the top end of the middle fixed sleeve (301) is arranged and fixed with a vertical partition plate (303), the vertical partition plates (303) on the same side are plug-in matched with the plug-in plates (304), and each group of cavities separated by the vertical partition plates (303) and the plug-in plates (304) between the middle fixed sleeve (301) and the top fixed sleeve (203) are provided with a catalytic module (305).

6. The device according to claim 2, 3 or 5, characterized in that: The exhaust gas filtering assembly (4) further comprises a rotating frame (406) and a central gear (409), the main body top end of the annular cover (403) is arranged and opened with an exhaust hole (404), the bottom end of the rotating frame (406) is fixedly connected with the top end of the annular cover (403), the outer surface of the main body of the flue gas inlet pipe (209) is fixedly installed with a fixed rotating seat (407), the top end middle part of the rotating frame (406) is fixedly installed with a rotating sleeve (408), the rotating sleeve (408) is rotationally connected with the fixed rotating seat (407), the motor position opened in the main body of the tank cover (102) is installed with a driving motor (410), the rotating shaft of the driving motor (410) is inserted and fixed with a driving gear (411), the central gear (409) is inserted and fixed in the rotating sleeve (408) and is engaged with the driving gear (411).

7. The device according to claim 6, characterized in that: The inlet end of the flue gas inlet pipe (209) is further provided with an air inlet cutting assembly (5), the air inlet cutting assembly (5) comprises a fixed frame (501), a cutting disc (502), a cutting net (503) and a centrifugal fan (506), the fixed frame (501) is fixed to the outer surface of the main body of the flue gas inlet pipe (209), the outer side surface of the cutting disc (502) is fixedly connected with one end of the main body of the fixed frame (501), the cutting net (503) is rotationally connected in the cavity wall of the cutting disc (502), the top end of the rotating frame (406) is fixedly connected with a driving bevel gear (505), the outer circular surface of the cutting net (503) is fixedly connected with a driven bevel gear (504), the driven bevel gear (504) is engaged with the driving bevel gear (505), the eccentric ends of the side walls of the cutting disc (502) are fixedly connected with eccentric pipes (507), the eccentric pipe (507) on one side of the cutting disc (502) is connected with the inlet of the flue gas inlet pipe (209), and the eccentric pipe (507) on the other side is connected with the outlet of the centrifugal fan (506).

8. A method for using a pulse steam pyrolysis and denitration synergistic waste incineration flue gas purification device, characterized in that, The pulse steam pyrolysis and denitration synergistic waste incineration flue gas purification device based on any one of claims 1-7 comprises the following steps: S1, pyrolysis of flue gas, the external flue gas to be treated can enter the steam cavity between the outer wall of the inner support cylinder (212) and the inner wall of the steam tank (201) from the flue gas inlet pipe (209), the external steam supply system can continuously supply steam to the spiral pipe (213), the steam can diffuse into the filler (215) in the steam cavity from the steam discharge micropore (214) on the inner and outer surface of the spiral pipe (213), and the flue gas is subjected to steam pyrolysis treatment, the dioxin pollutants in the flue gas are broken into small molecules of harmless substances and nitrogen oxides; S2, SCR denitration treatment of steam, the outer wall of the steam tank (201) and the inner wall of the main tank body (101) form a denitration catalytic cavity, the catalytic module (305) loaded with catalyst is installed in the denitration catalytic cavity, and the catalytic reduction reaction with nitrogen oxides in the flue gas can occur, the flue gas in the steam cavity is sufficient to push away the cover (205), and the flue gas pyrolyzed by steam diffuses into the denitration catalytic cavity from the U-shaped pipe (204), reacts with the catalyst in the catalytic module (305), and the dioxin and nitrogen oxides in the flue gas are efficiently removed; S3, emission of purified flue gas, the purified flue gas passes through each group of exhaust guide pipes (401) and enters the cavity composed of the annular seat (402) and the annular cover (403), with the rotation of the exhaust filter element (405) driven by the annular cover (403), the flue gas is efficiently filtered by the exhaust filter element (405), and then is discharged outwardly to meet the standard.

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