CN113932240B

CN113932240B - Harmful gas multistage purification device for boiler waste heat recovery power generation equipment

Info

Publication number: CN113932240B
Application number: CN202111245950.7A
Authority: CN
Inventors: 张坦; 刘倩
Original assignee: Pinghu Derun Environmental Protection & Energy Technology Co ltd
Current assignee: Pinghu Derun Environmental Protection & Energy Technology Co ltd
Priority date: 2021-10-26
Filing date: 2021-10-26
Publication date: 2023-07-14
Anticipated expiration: 2041-10-26
Also published as: CN113932240A

Abstract

The invention discloses a harmful gas multistage purification device for boiler waste heat recovery power generation equipment, which comprises a collecting piece, wherein a feeding piece is arranged on the collecting piece, symmetrically distributed filtering pieces are communicated with the feeding piece, a conversion piece is arranged on the collecting piece, the filtering pieces are communicated with the conversion piece, a first purification piece is arranged on the collecting piece, and a second purification piece is communicated with the first purification piece. The purification device can efficiently recycle waste heat of waste smoke to generate electricity, so that the energy utilization rate is improved, particles in the waste smoke are convenient to clean, the smoke circulation rate is ensured, the normal operation of equipment is not influenced by the replacement of the filter screen, the problem of traditional shutdown cleaning is solved, and the recycling efficiency is improved; the purifying liquid in the purifying box adopts a communication type, so that the purifying efficiency is improved, meanwhile, the stability of the purifying liquid in the purifying box is guaranteed, the smooth ventilation treatment is guaranteed, the risk of extruding the purifying liquid from the smoke outlet pipe is reduced, the purifying treatment is carried out in three stages, and the purifying effect is good.

Description

Harmful gas multistage purification device for boiler waste heat recovery power generation equipment

Technical Field

The invention relates to a purifying device, in particular to a harmful gas multistage purifying device for boiler waste heat recovery power generation equipment.

Background

At present, a great deal of energy consumption is required in various industrial production fields, and heat energy which is generated in various heat energy conversion equipment, energy utilization equipment and chemical reaction equipment and is not utilized in the production process can also generate a great deal of waste heat in various forms in the production process, wherein the sources of the waste heat mainly include waste heat of industrial exhaust gas, waste heat of high-temperature products and slag, waste heat of cooling media, waste heat generated in the chemical reaction process, combustible waste gas, waste heat of waste materials and waste liquid and waste heat of waste steam and waste water.

Waste heat utilization in the boiler industry is an important subject in energy conservation at present, and has high economic benefit and social benefit. For example, waste heat from a smelting furnace in the boiler industry is utilized by converting waste heat from the smelting furnace into other energy sources, such as electrical energy, steam energy, or as power to directly drive other mechanical equipment and to provide heat. In waste heat power generation, a large amount of solid particles and harmful substances exist in industrial waste gas, so that the waste gas cannot be directly utilized, and the harmful substances in the gas cannot be directly discharged, so that environmental pollution is easily caused.

Disclosure of Invention

The invention aims to provide a harmful gas multistage purification device for a boiler waste heat recovery power generation device, which solves the technical problems, can efficiently recover waste heat of waste smoke to generate power, improves the energy utilization rate, ensures convenient cleaning of particles in the waste smoke, ensures the smoke circulation rate, ensures that the replacement of a filter screen does not influence the normal operation of the device, breaks away from the problem of traditional shutdown cleaning, improves the recovery efficiency, ensures the stability of internal purification liquid while improving the purification efficiency, ensures smooth ventilation treatment, reduces the extrusion risk of the purification liquid from a smoke outlet pipe, and has good purification effect.

The aim of the invention can be achieved by the following technical scheme:

the utility model provides a multi-stage purification device of harmful gas for boiler waste heat recovery power generation facility, purifier includes the collecting member, be equipped with the feed piece on the collecting member, the intercommunication is equipped with symmetrical distribution's filter piece on the feed piece, is equipped with the conversion piece on the collecting member, filter piece and conversion piece intercommunication are equipped with first purifying piece on the collecting member, and the intercommunication is equipped with the second purifying piece on the first purifying piece, is equipped with symmetrical distribution's pneumatic cylinder in the collecting member, and the output shaft fastening of pneumatic cylinder has the moving part, is equipped with on the moving part and cleans the piece.

The moving part comprises a moving frame, and an output shaft of the hydraulic cylinder is fixedly connected with the moving frame.

The cleaning piece comprises a first rotating piece and second rotating pieces which are symmetrically distributed, the first rotating piece comprises a first rotating barrel, the first rotating barrel is rotationally connected with the movable frame, a second inclined bucket is arranged on the first rotating barrel, a brush frame is arranged on the second inclined bucket, and a sliding piece is arranged in the first rotating barrel in a sliding mode.

Further, the collecting piece comprises a collecting box, a first limiting rod is arranged in the collecting box, and a second limiting rod is arranged in the collecting box.

Further, the feed piece includes the feeding case, and the intercommunication is equipped with the combustion case in the feeding case, and the slope is equipped with the inlet port of array distribution on the combustion case, forms between combustion case and the feeding case and send the gas zone, is equipped with the flame nozzle in the third fixed incasement, and the below cartridge filter of combustion case forms the filtration zone between cartridge filter and the feeding case.

Further, the filter element comprises a filter box, a fixed plate is arranged in the filter box, a matching groove is formed in the fixed plate, an inclined pipe is arranged on the filter box in a communicating mode, the inclined pipe is communicated with a filter area, a limiting plate is arranged in the filter box in a sliding mode, an arc-shaped groove is formed in the limiting plate, a limiting groove is formed in the arc-shaped groove, a filter screen is arranged in the limiting groove, a clamping plate is arranged on the filter screen and matched with the matching groove, and the filter screen divides the filter box into a feeding area and a discharging area.

Further, the conversion piece comprises a thermoelectric converter, symmetrically distributed connecting pipes are communicated with the thermoelectric converter, the connecting pipes are communicated with the discharging area, and a second control valve is arranged on the connecting pipes.

Further, the first purifying piece includes the purifying box, and the purifying box in-connection is equipped with out the tobacco pipe, and the intercommunication is equipped with out the chimney on going out the tobacco pipe, is equipped with filling material on going out the chimney, is equipped with the defroster in going out the chimney, is equipped with communicating pipe on the purifying box.

Further, the second purifying piece is identical to the first purifying piece in structure, and the difference is that a liquid inlet pipe is arranged on the purifying box on the second purifying piece, and the purifying box between the second purifying piece and the first purifying piece is communicated through a communicating pipe.

Further, the movable frame is provided with a first gear in a rotating manner, the movable frame is provided with a motor, the movable frame is provided with a movable cylinder, the movable cylinder is provided with a first inclined hopper, the first inclined hopper is provided with a sliding block, the sliding block is in sliding connection with the feeding box, and the movable cylinder is in sliding fit with the filter cylinder.

Further, the first rotating cylinder is communicated with the collecting box, a second gear is arranged below the first rotating cylinder, and the second inclined hopper is matched with the inner wall of the filter cylinder.

The sliding part comprises a rotating disc, the rotating disc is in sliding fit with the first rotating cylinder, a positioning groove is formed in the rotating disc, the positioning groove is rotationally connected with the first limiting rod, a sliding rod is arranged on the rotating disc, the sliding rod is in sliding connection with the first rotating cylinder, and the first gear is in meshed transmission with the second gear.

Further, the second rotating part comprises a second rotating cylinder, the second rotating cylinder is rotationally connected with the movable frame, the second rotating cylinder is communicated with the collecting box, a third gear is arranged below the second rotating cylinder and is in meshed transmission with the second gear, a third inclined bucket is arranged on the second rotating cylinder and is in sliding fit with the filtering box, a hairbrush is arranged on the third inclined bucket, and a discharging part is arranged in the second rotating cylinder in a sliding mode.

The unloading piece and the sliding piece are identical in structure, the rotating disc on the unloading piece is in sliding fit with the second rotating cylinder, the rotating disc on the unloading piece is in rotating connection with the second limiting rod, and the sliding rod on the unloading piece is in sliding connection with the second rotating cylinder.

The invention has the beneficial effects that:

1. the purification device can efficiently recycle waste heat of waste smoke to generate electricity, so that the energy utilization rate is improved, particles in the waste smoke are convenient to clean, the smoke circulation rate is ensured, the normal operation of equipment is not influenced by the replacement of the filter screen, the problem of traditional shutdown cleaning is solved, and the recycling efficiency is improved;

2. the purifying liquid in the purifying box of the purifying device adopts a communication type, improves the purifying efficiency, ensures the stability of the purifying liquid in the purifying box, ensures smooth ventilation treatment, reduces the risk of extruding the purifying liquid from the smoke outlet pipe, and has good purifying effect in three-stage purifying treatment.

Drawings

The invention is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic view of the structure of a purification device of the present invention;

FIG. 2 is a cross-sectional view of a purification apparatus of the present invention;

FIG. 3 is a cross-sectional view of a purification apparatus of the present invention;

FIG. 4 is a schematic view of a part of the structure of the purification apparatus of the present invention;

FIG. 5 is a cross-sectional view of a purification apparatus of the present invention;

FIG. 6 is a cross-sectional view of a purification apparatus of the present invention;

FIG. 7 is a schematic view of a portion of the structure of a filter element of the present invention;

FIG. 8 is a schematic view of a portion of the structure of a filter element of the present invention;

FIG. 9 is an enlarged schematic view of the structure of FIG. 5A according to the present invention;

FIG. 10 is an enlarged schematic view of the structure of FIG. 4B in accordance with the present invention;

FIG. 11 is a schematic view of a part of the structure of the moving member 8 of the present invention;

FIG. 12 is a schematic view of the structure of the cleaning element of the present invention;

FIG. 13 is a cross-sectional view of a cleaning element of the present invention;

FIG. 14 is a schematic view of a part of the construction of a cleaning element according to the present invention;

fig. 15 is a cross-sectional view of a cleaning element of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The utility model provides a boiler waste heat recovery power generation facility is with harmful gas multi-stage purification device, purifier includes collecting piece 1, as shown in fig. 1, fig. 2, fig. 3, be equipped with feeding piece 2 on the collecting piece 1, the intercommunication is equipped with symmetrical distribution's filter piece 3 on the feeding piece 2, be equipped with conversion piece 4 on the collecting piece 1, two filter pieces 3 all communicate with conversion piece 4, be equipped with first purifying piece 5 on the collecting piece 1, the intercommunication is equipped with second purifying piece 6 on the first purifying piece 5, be equipped with symmetrical distribution's pneumatic cylinder 7 in the collecting piece 1, the output shaft fastening of pneumatic cylinder 7 has moving part 8, be equipped with cleaning piece 9 on the moving part 8.

The collecting piece 1 is used for collecting solid particles in smoke dust, through the filtering and collecting of feed piece 2 and filter piece 3 both sides, guarantee that gaseous normal rate circulates, collecting piece 1 includes collecting box 11, as shown in fig. 1 through 4, be equipped with first gag lever post 12 in the collecting box 11, be equipped with second gag lever post 13 in the collecting box 11, the height of second gag lever post 13 is higher than first gag lever post 12, reduce the time that the smoke dust directly gets into filter piece 3 from feed piece 2 through collecting box 11, prevent that big granule from getting into in the filter piece 3, the intercommunication is equipped with the first fixed case 14 of symmetry canvas on the collecting box 11, the pneumatic cylinder 7 is fixed in first fixed case 14, the intercommunication is equipped with the fixed case 15 of second on the collecting box 11.

The feeding member 2 comprises a feeding box 21, as shown in fig. 5, a combustion box 22 is arranged in the feeding box 21, the combustion box 22 is made of a high-temperature-resistant material, an air inlet 23 distributed in an array is obliquely arranged on the combustion box 22, a one-way valve is arranged in the air inlet 23 to prevent dust particles from entering the air inlet 23, an air feeding area 24 is formed between the combustion box 22 and the feeding box 21, an air inlet pipe 25 is arranged in the air feeding area 24 in a communicating manner, oxygen enters the combustion box 22 through the air inlet pipe 25 through the air feeding area 24 and the air inlet 23, an air inlet pipe 26 is arranged in the combustion box 22 in a communicating manner, a third fixed box 27 is arranged in the combustion box 22 in a communicating manner, a flame nozzle 28 is arranged in the third fixed box 27, a filter cylinder 29 is arranged below the combustion box 22, a filtering area 291 is formed between the filter cylinder 29 and the feeding box 21, a through hole 292 is formed in the lower communication of the feeding box 21, the feeding box 21 is fixedly connected with a collecting box 11, waste smoke is introduced into the combustion box 22 from the air inlet pipe 26, oxygen is introduced into the combustion box 22, the flame nozzle 28 is sufficiently decomposed, and the primarily filtered gas enters the filtering area 291.

As shown in fig. 3, fig. 6, fig. 7, fig. 8, fig. 9, the filter 3 includes the filter box 31, be equipped with the fixed plate 311 in the filter box 31, be equipped with the cooperation groove 312 on the fixed plate 311, the intercommunication is equipped with the hang-over pipe 313 on the filter box 31, hang-over pipe 313 and filtration district 291 intercommunication, hang-over pipe 313 is upwards inclined from the feed box 21 side, reduce the probability that granule gets into in the filter box 31, be equipped with first control valve 314 on the hang-over pipe 313, be equipped with limiting plate 32 in the filter box 31 sliding, be equipped with arc wall 33 on the limiting plate 32, be equipped with spacing groove 34 in the arc wall 33, be equipped with locating piece 35 on the limiting plate 32, be equipped with filter screen 36 in the spacing groove 34, be equipped with joint plate 37 on the filter screen 36, the filter screen 36 is inserted in spacing groove 34 through joint plate 37, joint plate 37 cooperates with the cooperation groove 312, locating hole cooperation on locating piece 35 and the fixed plate 311, the limiting plate 32 is fixed through the screw rod with the filter box 31, filter box 31 cuts apart into feed district 391 and ejection of compact district 391, the below intercommunication in feed district 391 is equipped with round hole 38, the feed district's receipt in the feed district is received from primary filtration district's internal filter cake, filter cake is passed through primary filtration filter cake filtration waste smoke of secondary filtration filter 392 again and is blown into primary filtration district waste smoke filtration waste filter 392 again in the primary filtration district's filtration.

The converter 4 includes a thermoelectric converter 41, as shown in fig. 1 and 2, the thermoelectric converter 41 is fixedly connected with the collecting box 11, a symmetrically distributed connecting pipe 42 is communicated with the thermoelectric converter 41, the connecting pipe 42 is communicated with a discharging area 392, a second control valve 43 is arranged on the connecting pipe 42, a smoke exhaust pipe 44 is communicated with the thermoelectric converter 41, a third control valve 45 is arranged on the smoke exhaust pipe 44, secondary filtered waste smoke enters the thermoelectric converter from the connecting pipe 42 to convert electric energy, and the waste smoke is discharged from the smoke exhaust pipe 44 into the first purifying piece 5.

The first purifying member 5 comprises a purifying box 51, as shown in fig. 2, a third control valve 45 prevents purifying liquid in the purifying box 51 from flowing back into the thermoelectric converter 41, the purifying box 51 is fixedly connected with the collecting box 11, a smoke outlet pipe 52 is connected in the purifying box 51, reaction solution in the purifying box 51 submerges the bottom of the smoke outlet pipe 52, a smoke outlet pipe 53 is connected to the smoke outlet pipe 52, a filling material 54 is arranged on the smoke outlet pipe 53, the filling material 54 is used for removing residual harmful gas which is completely reacted, a demister 55 is arranged in the smoke outlet pipe 53, and a communicating pipe 56 is arranged on the purifying box 51.

As shown in fig. 2, the second purifying member 6 has the same structure as the first purifying member 5, except that a liquid inlet pipe 61 is provided in the purifying tank 51 of the second purifying member 6, and a fourth control valve 62 is provided in the liquid inlet pipe 61. The purifying tanks 51 between the second purifying member 6 and the first purifying member 5 are communicated through the communicating pipe 56, and the purifying liquid enters the two purifying tanks 51 through the liquid inlet pipe 61; the smoke discharged from the smoke discharge pipe 44 is absorbed by the purifying liquid in the two purifying tanks 51, enters the smoke discharge pipe 53 from the smoke discharge pipe 52, is again absorbed by the filler 54, and is discharged after being treated by the demister 55.

The moving member 8 includes a moving frame 81, as shown in fig. 3, 10 and 11, an output shaft of the hydraulic cylinder 7 is fixedly connected with the moving frame 81, a first gear 82 is rotatably arranged on the moving frame 81, a motor 83 is arranged on the moving frame 81, a moving cylinder 84 is arranged on the moving frame 81, a first inclined hopper 85 is arranged on the moving cylinder 84, a sliding block 86 is arranged on the first inclined hopper 85, the sliding block 86 is slidably connected with the feeding box 21, the moving cylinder 84 is slidably matched with the filter cylinder 29, and fine particles in a filter area 291 fall onto the first inclined hopper 85.

The cleaning member 9 includes a first rotating member 91 and a second rotating member 92 symmetrically distributed, as shown in fig. 12 to 15, the first rotating member 91 includes a first rotating cylinder 911, the first rotating cylinder 911 is rotationally connected with the moving frame 81, the first rotating cylinder 911 is communicated with the collecting box 11, the first rotating cylinder 911 is slidably matched with the through hole 292, a second gear 912 is arranged below the first rotating cylinder 911, a second inclined bucket 913 is arranged on the first rotating cylinder 911, the second inclined bucket 913 is matched with the inner wall of the filter cartridge 29, a brush holder 914 is arranged on the second inclined bucket 913, a sliding member 915 is arranged in the first rotating cylinder 911 in a sliding manner, the sliding member 915 includes a rotating disc 9151, the rotating disc 9151 is slidably matched with the first rotating cylinder 911, a positioning groove 9152 is arranged on the rotating disc 9151, the positioning groove 9152 is rotationally connected with the first limiting rod 12, the first limiting rod 12 is slidably matched with the through hole 292, a sliding rod 9153 is arranged on the rotating disc 9153 and is slidably connected with the first rotating cylinder 911, the first gear 82 is slidably matched with the second gear 912, and the sliding member 915 is slidably arranged on the second inclined bucket 913 and is provided with the sliding member 915;

the second rotating member 92 comprises a second rotating cylinder 921, the second rotating cylinder 921 is rotationally connected with the movable frame 81, the second rotating cylinder 921 is communicated with the collecting box 11, the second rotating cylinder 921 is in sliding fit with the round hole 38, a third gear 922 is arranged below the second rotating cylinder 921, the third gear 922 is in meshing transmission with the second gear 912, a third inclined bucket 923 is arranged on the second rotating cylinder 921, the third inclined bucket 923 is in sliding fit with the filtering box 31, a hairbrush 924 is arranged on the third inclined bucket 923, and a discharging member 925 is arranged in sliding of the second rotating cylinder 921;

the structure of the discharging part 925 is the same as that of the sliding part 915, the rotating disc 9151 on the discharging part 925 is in sliding fit with the second rotating cylinder 921, the rotating disc 9151 on the discharging part 925 is used for blocking the communication between the second rotating cylinder 921 and the collecting box 11, the rotating disc 9151 on the discharging part 925 is in rotating connection with the second limiting rod 13, and the sliding rod 9153 on the discharging part 925 is in sliding connection with the second rotating cylinder 921.

Example 1

The purifying liquid enters the two purifying boxes 51 through the liquid inlet pipe 61; the waste smoke is introduced into the combustion box 22 from the smoke inlet pipe 26, oxygen is introduced into the combustion box 22, the flame nozzle 28 is used for flame spraying to fully decompose gas, the waste smoke subjected to primary filtration enters the filtering area 291, the waste smoke subjected to primary filtration enters the feeding area 391 through the inclined pipe 313, is filtered again through the filter screen 36, the secondary filtered waste smoke enters the thermoelectric converter 41 from the discharging area 392 through the connecting pipe 42 for energy conversion, and is discharged into the purifying box 51 from the smoke exhaust pipe 44, the waste smoke is absorbed by purifying liquid in the two purifying boxes 51, enters the smoke outlet pipe 53 from the smoke outlet pipe 52, is absorbed again through the filling material 54 and is discharged after being treated by the demister 55.

Example 2

When the filter cartridge 29 and the filter screen 36 are cleaned, the motor 83 rotates, the first rotating cylinder 911 and the second rotating cylinder 921 are driven to rotate through gear engagement transmission, the output shaft of the hydraulic cylinder 7 drives the moving frame, the first rotating cylinder 911 and the second rotating cylinder 921 to move upwards, the sliding piece 915 is separated from the first rotating cylinder 911, the first rotating cylinder 911 is communicated with the collecting box 11, the brush frame 914 cleans the filter cartridge 29, the blockage is reduced, the smoke flow rate is improved, cleaned particles fall into the collecting box 11 from the first rotating cylinder 911, when the brush 924 contacts the filter screen 36, the sliding piece 915 is separated from the second rotating cylinder 921, the second rotating cylinder 921 is communicated with the collecting box 11, and the cleaned particles fall into the collecting box 11 from the second rotating cylinder 921.

Example 3

When the filter screen 36 is replaced, the second control valve 43 at the replacing side is closed, the limiting plate 32 and the filter screen 36 are pulled out, the new filter screen 36 is inserted into the limiting groove 34, the filter screen 36 and the limiting plate 32 are inserted into the filter box 31, the filter screen 36 is fixed through the screw rod, the replacement at one side is completed, the replacement mode at the other side is the same, and the normal operation of the device is ensured during the replacement.

The purifying device disclosed by the invention is used for efficiently recycling waste heat of waste smoke to generate electricity, so that the energy utilization rate is improved, particles in the waste smoke are convenient to clean, the smoke circulation rate is ensured, the normal operation of equipment is not influenced by the replacement of the filter screen, the problem of traditional shutdown cleaning is solved, the recycling efficiency is improved, the purifying liquid in the purifying box is in a communication type, the purifying efficiency is improved, meanwhile, the stability of the internal purifying liquid is ensured, the smooth ventilation treatment is ensured, the risk of extruding the purifying liquid out of the smoke outlet pipe is reduced, and the purifying effect is good.

In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.

Claims

1. The utility model provides a harmful gas multi-stage purification device for boiler waste heat recovery power generation facility, purifier includes collecting piece (1), its characterized in that, be equipped with feed piece (2) on collecting piece (1), feed piece (2) are last to be linked together and are equipped with symmetric distribution's filter piece (3), be equipped with conversion piece (4) on collecting piece (1), filter piece (3) and conversion piece (4) intercommunication are equipped with first purifying piece (5) on collecting piece (1), first purifying piece (5) are last to be linked together and are equipped with second purifying piece (6), be equipped with symmetric distribution's pneumatic cylinder (7) in collecting piece (1), the output shaft fastening of pneumatic cylinder (7) has moving part (8), be equipped with on moving part (8) and clean piece (9);

the moving part (8) comprises a moving frame (81), and an output shaft of the hydraulic cylinder (7) is fixedly connected with the moving frame (81);

the cleaning piece (9) comprises a first rotating piece (91) and second rotating pieces (92) which are symmetrically distributed, the first rotating piece (91) comprises a first rotating barrel (911), the first rotating barrel (911) is rotationally connected with the movable frame (81), a second inclined bucket (913) is arranged on the first rotating barrel (911), a brush holder (914) is arranged on the second inclined bucket (913), and a sliding piece (915) is arranged in the first rotating barrel (911) in a sliding manner;

the collecting piece (1) comprises a collecting box (11), a first limiting rod (12) is arranged in the collecting box (11), and a second limiting rod (13) is arranged in the collecting box (11);

the feeding piece (2) comprises a feeding box (21), a combustion box (22) is arranged in the feeding box (21), air inlets (23) distributed in an array are obliquely arranged on the combustion box (22), an air feeding area (24) is formed between the combustion box (22) and the feeding box (21), a flame nozzle (28) is arranged in a third fixed box (27), a filter cartridge (29) is arranged below the combustion box (22), and a filter area (291) is formed between the filter cartridge (29) and the feeding box (21);

the movable frame (81) is rotatably provided with a first gear (82), the movable frame (81) is provided with a motor (83), the movable frame (81) is provided with a movable barrel (84), the movable barrel (84) is provided with a first inclined hopper (85), the first inclined hopper (85) is provided with a sliding block (86), the sliding block (86) is in sliding connection with the feeding box (21), and the movable barrel (84) is in sliding fit with the filter barrel (29);

the first rotating cylinder (911) is communicated with the collecting box (11), a second gear (912) is arranged below the first rotating cylinder (911), and the second inclined hopper (913) is matched with the inner wall of the filter cylinder (29);

the sliding piece (915) comprises a rotating disc (9151), the rotating disc (9151) is in sliding fit with the first rotating cylinder (911), a positioning groove (9152) is formed in the rotating disc (9151), the positioning groove (9152) is in rotating connection with the first limiting rod (12), a sliding rod (9153) is arranged on the rotating disc (9151), the sliding rod (9153) is in sliding connection with the first rotating cylinder (911), and the first gear (82) is in meshed transmission with the second gear (912);

the second rotating piece (92) comprises a second rotating barrel (921), the second rotating barrel (921) is rotationally connected with the movable frame (81), the second rotating barrel (921) is communicated with the collecting box (11), a third gear (922) is arranged below the second rotating barrel (921), the third gear (922) is in meshed transmission with the second gear (912), a third inclined hopper (923) is arranged on the second rotating barrel (921), the third inclined hopper (923) is in sliding fit with the filtering box (31), a hairbrush (924) is arranged on the third inclined hopper (923), and a discharging piece (925) is arranged in the second rotating barrel (921) in a sliding mode;

the unloading piece (925) and the sliding piece (915) are identical in structure, a rotating disc (9151) on the unloading piece (925) is in sliding fit with the second rotating cylinder (921), the rotating disc (9151) on the unloading piece (925) is in rotating connection with the second limiting rod (13), and a sliding rod (9153) on the unloading piece (925) is in sliding connection with the second rotating cylinder (921).

2. The harmful gas multistage purification device for the boiler waste heat recovery power generation equipment according to claim 1, wherein the filter piece (3) comprises a filter box (31), a fixed plate (311) is arranged in the filter box (31), a matching groove (312) is formed in the fixed plate (311), an inclined pipe (313) is arranged on the filter box (31) in a communicating mode, the inclined pipe (313) is communicated with a filtering area (291), a limiting plate (32) is arranged in the filter box (31) in a sliding mode, an arc-shaped groove (33) is formed in the limiting plate (32), a limiting groove (34) is formed in the arc-shaped groove (33), a filter screen (36) is arranged in the limiting groove (34), a clamping plate (37) is arranged on the filter screen (36), the clamping plate (37) is matched with the matching groove (312), and the filter screen (36) divides the filter box (31) into a feeding area (391) and a discharging area (392).

3. The harmful gas multistage purification device for the boiler waste heat recovery power generation equipment according to claim 2, wherein the conversion piece (4) comprises a thermoelectric converter (41), symmetrically distributed connecting pipes (42) are communicated with the thermoelectric converter (41), the connecting pipes (42) are communicated with the discharging area (392), and a second control valve (43) is arranged on the connecting pipes (42).

4. The harmful gas multistage purification device for the boiler waste heat recovery power generation equipment according to claim 1, wherein the first purification piece (5) comprises a purification box (51), a smoke outlet pipe (52) is arranged in the purification box (51) in a communicating way, a smoke outlet pipe (53) is arranged on the smoke outlet pipe (52) in a communicating way, a filling material (54) is arranged on the smoke outlet pipe (53), a demister (55) is arranged in the smoke outlet pipe (53), and a communicating pipe (56) is arranged on the purification box (51).

5. The harmful gas multistage purification device for a boiler waste heat recovery power generation device according to claim 4, wherein the second purification member (6) has the same structure as the first purification member (5), and is different in that a liquid inlet pipe (61) is provided on a purification tank (51) on the second purification member (6), and the purification tank (51) between the second purification member (6) and the first purification member (5) is communicated through a communicating pipe (56).