Waste heat recovery device for thermal power plant

Abstract

The invention relates to the field of waste heat recovery, and discloses a waste heat recovery device for a thermal power plant. The device comprises a base, a flue gas conveying mechanism, a primary filtering mechanism, a cleaning mechanism, a supporting frame, a heat exchange and heat preservation mechanism and a filtering mechanism; the flue gas conveying mechanism comprises a gas inlet pipe, the left side of the gas inlet pipe is fixedly connected with a conveying box, the right side of the gas inlet pipe is fixedly connected with a conveying pipe, the primary filtering mechanism comprises an upper cover plate, the lower end of the upper cover plate is fixedly connected with an arc-shaped frame, the inner wall of the arc-shaped frame is fixedly connected with a filter screen, and the upper cover plate is clamped with the upper end of the flue gas conveying mechanism; an upper cover plate is pulled to pull out an arc-shaped frame and a filter screen, the filter screen can be replaced, meanwhile, after the filter screen is placed in an air inlet pipe, smoke entering a conveying box can be filtered, a primary filtering mechanism can be fixedly placed through clamping of the upper cover plate, and a gap is reserved between the primary filtering mechanism and a smoke conveying mechanism; and the flue gas in the flue gas conveying mechanism overflows.

Description

Technical Field

[0001] The invention belongs to the technical field of waste heat recovery, and in particular relates to a waste heat recovery device for a thermal power plant. Background Art

[0002] During the operation of the steam turbine in a thermal power plant, high-temperature steam is generated. The existing methods for treating high-temperature steam include direct discharge and condensation. Both of the above methods do not effectively recover the heat energy in the high-temperature steam, resulting in energy waste.

[0003] 1. In the existing flue gas waste heat recovery device, when recovering the waste heat of the flue gas, the dust particles in the flue gas are easy to stick to the heat conduction plate, which is difficult to clean, resulting in poor use effect and affecting heat absorption.

[0004] 2. In actual use, the flue gas pipe is directly connected to the cold water in the recovery box, the recovery efficiency is not high, and the flue gas is directly discharged to the outside after the recycling is completed without any purification treatment, causing certain pollution to the environment. Summary of the invention

[0005] The purpose of the present invention is to provide a waste heat recovery device for a thermal power plant in order to solve the above-mentioned problems.

[0006] The technical solution adopted by the present invention is as follows: a waste heat recovery device for a thermal power plant, comprising a base, a smoke conveying mechanism is arranged on the left side of the upper end of the base, a primary filtering mechanism is arranged inside the smoke conveying mechanism, a cleaning mechanism is arranged on the relatively inner side of the primary filtering mechanism, a support frame is fixedly connected to the right side of the upper end of the base, a heat exchange and insulation mechanism is arranged on the upper end of the support frame, and a filtering mechanism is arranged on the upper end of the heat exchange and insulation mechanism; the smoke conveying mechanism comprises an air intake pipe, a conveying box is fixedly connected to the left side of the air intake pipe, a conveying pipe is fixedly connected to the right side of the air intake pipe, the primary filtering mechanism comprises an upper cover plate, an arc frame is fixedly connected to the lower end of the upper cover plate, a filter net is fixedly connected to the inner wall of the arc frame, and the upper cover plate is clamped with the upper end of the smoke conveying mechanism.

[0007] By adopting the above technical solution, the upper cover is pulled to extract the arc frame and the filter, and the filter can be replaced. At the same time, when the filter is placed inside the air inlet pipe, the smoke entering the conveying box can be filtered. The primary filter mechanism can be fixed and placed by the snap connection of the upper cover. A gap is left between the primary filter mechanism and the smoke conveying mechanism to allow the smoke inside the smoke conveying mechanism to overflow.

[0008] In a preferred embodiment, a cleaning mechanism is provided at the inner middle end of the air intake pipe, and the cleaning mechanism includes a motor, the output end of the motor is fixedly connected to a rotating rod, the outer end of the rotating rod is fixedly connected to a fixed block, the left side of the fixed block is fixedly connected to a connecting rod, the left side of the connecting rod is fixedly connected to a cleaning brush, and the cleaning brush is against the filter.

[0009] By adopting the above technical solution, the motor drives the rotating rod to rotate, the fixing block and the connecting rod drive the cleaning brush to rotate, and the mesh of the filter is cleaned by the contact between the cleaning brush and the filter.

[0010] In a preferred embodiment, the heat exchange and insulation mechanism includes a heat exchange inner cylinder, the upper and lower ends of the heat exchange inner cylinder are fixedly connected to a lower insulation bucket, the upper end of the delivery pipe is fixedly connected to the lower end of the lower insulation bucket, the delivery pipe passes through the lower insulation bucket and the bottom end of the heat exchange inner cylinder is fixedly connected to a flue gas delivery spiral pipe, and the upper end of the heat exchange inner cylinder is fixedly connected to a water inlet pipe.

[0011] By adopting the above technical solution, cold water is transported to the inside of the heat exchange inner cylinder through the water inlet pipe, and hot gas is transported to the inside of the flue gas conveying spiral tube through the conveying pipe, and the cold water inside the heat exchange inner cylinder is heated by the flue gas conveying spiral tube.

[0012] In a preferred embodiment, the outer end of the heat exchange inner cylinder is fixedly connected to an outer insulation box, the upper left end of the outer insulation box is fixedly connected to a ventilation pipe, a one-way valve is provided inside the ventilation pipe, and the upper end of the outer insulation box is fixedly connected to a support frame.

[0013] By adopting the above technical solution, the support frame can support the filtering mechanism, and the ventilation pipe can transmit the smoke inside the outer insulation box to the outside through the one-way valve, while preventing the external cold air from entering the interior of the outer insulation box.

[0014] In a preferred embodiment, the filtering mechanism includes a filter frame, the inner bottom end of the filter frame is fixedly connected to a lower conveying plate, the lower end of the lower conveying plate is fixedly connected to the upper end of the smoke conveying spiral tube, the inner upper end of the filter frame is fixedly connected to an upper suction cup, the upper end of the upper suction cup is fixedly connected to a suction pump, the right side of the suction pump is fixedly connected to a secondary conveying pipe, the lower end of the secondary conveying pipe is fixedly connected to the lower end of the right side of the outer insulation box, and a one-way valve 2 is provided on the inner wall of the secondary conveying pipe close to the right side of the outer insulation box.

[0015] By adopting the above technical solution, the lower conveying plate conveys and diffuses the hot air, and then the filtered hot air is absorbed by the upper suction cup. The hot air can be extracted by a suction pump and then transported to the inside of the outer insulation box through the secondary conveying pipe.

[0016] In a preferred embodiment, the inner wall of the filter frame is fixedly connected with a concave groove, the interior of the concave groove is slidably connected with a sliding frame, the interior of the sliding frame is provided with activated carbon, the relatively inner front end of the filter frame is fixedly connected with a sealing concave strip, the front end of the filter frame is hinged with a box door, the end of the box door close to the filter frame is fixedly connected with a sealing strip, and the sealing strip is clamped with the sealing concave strip.

[0017] By adopting the above technical solution, the sliding frame can be slid out through the sliding of the sliding frame and the concave groove, and at the same time, the activated carbon is filled into the interior of the sliding frame to filter the residual heat flue gas again.

[0018] In a preferred embodiment, an L-shaped bracket is hung on the right front end of the filter frame, a rotating rod is fixedly connected to the right front end of the box door, the outer end of the rotating rod is rotatably connected to a baffle, and the outer ends of the rotating rod located on both sides of the baffle are fixedly connected to fixing rings.

[0019] By adopting the above technical solution, when the box door and the filter frame are closed, the baffle is rotated to rotate the right side of the baffle to the inside of the L-shaped bracket to fix the box door.

[0020] In a preferred embodiment, a sewage pipe is fixedly connected to the middle of the lower end of the air intake pipe, a one-way valve three is arranged inside the sewage pipe, an inclined plate is fixedly connected to the right side of the interior of the air intake pipe, and a support leg is fixedly connected to the lower end of the air intake pipe.

[0021] By adopting the above technical solution, the dust cleaned by the filter can be transported out through the sewage pipe, and the one-way valve three can reduce the external cold air from entering the interior of the air intake pipe.

[0022] In a preferred embodiment, a drain pipe is fixedly connected to the lower right end of the heat exchange inner cylinder, a manual valve is provided at the upper end of the drain pipe, and the outer end of the lower insulation bucket is fixedly connected to the middle end of the support frame.

[0023] By adopting the above technical solution, the hot water heated inside the heat exchange inner cylinder can be transported through the manual rotating rod manual valve and the drain pipe.

[0024] In a preferred embodiment, the outer insulation box is hollow, an asbestos board is fixedly connected to the outer end of the outer insulation box, the primary filtering mechanism is composed of two groups, and the filter screen near one end of the support frame is a fine mesh.

[0025] By adopting the above technical solution, the asbestos board can insulate the external insulation box, and at the same time, the residual heat in the hollow of the external insulation box can be used to perform secondary insulation on the inside of the heat exchange inner cylinder.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0027] In the present invention, the conveying box is connected with the waste heat pipe, so that the hot air generated during thermal power generation is conveyed to the inside of the intake pipe through the conveying box. After the smoke enters the inside of the intake pipe, the smoke is filtered by the arc frame inside the intake pipe. During the filtering, the rotating rod is driven to rotate by the motor, and the cleaning brush is driven to rotate by the fixed block and the connecting rod. The mesh of the filter is cleaned by the contact between the cleaning brush and the filter. The filtered smoke is conveyed to the inside of the smoke conveying spiral pipe inside the heat exchange inner cylinder by the conveying pipe, and cold water is conveyed to the inside of the heat exchange inner cylinder by the water inlet pipe. The cold water inside the heat exchange inner cylinder is heated by the smoke conveying spiral pipe. The heated smoke is discharged upward through the lower conveying plate, and filtered by activated carbon when the smoke rises. The filtered smoke is then sucked by the suction pump and then conveyed to the inside of the outer insulation box through the secondary conveying pipe. The outer end of the heat exchange inner cylinder is insulated and heated by the outer insulation box. Through the cooperation of the above structures, the smoke is preliminarily filtered and the waste heat is repeatedly utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall appearance of the device of the present invention;

[0029] Figure 2 It is a front view of the device in the present invention;

[0030] Figure 3 It is a structural schematic diagram of the filtering mechanism in the present invention;

[0031] Figure 4 For the present invention Figure 2 A magnified image of point A;

[0032] Figure 5 It is a top view of the primary filtering mechanism of the present invention;

[0033] Figure 6 It is a structural schematic diagram of the cleaning mechanism in the present invention.

[0034] Markings in the figure: 1. Base; 2. Smoke conveying mechanism; 201. Inlet pipe; 202. Conveying box; 203. Support leg; 204. Drain pipe; 205. Inclined plate; 206. Conveying pipe; 3. Support frame; 4. Heat exchange and insulation mechanism; 401. Heat exchange inner cylinder; 402. Lower insulation bucket; 403. External insulation box; 404. Smoke conveying spiral pipe; 405. Drain pipe; 406. Manual valve; 407. Ventilation pipe; 5. Filter mechanism; 501. Filter frame; 502. Box door; 503. Sealing concave strip; 504, sealing strip; 505, concave groove; 506, sliding frame; 507, activated carbon; 508, lower conveying plate; 509, upper suction cup; 6, suction pump; 7, support frame; 8, primary filtering mechanism; 801, upper cover plate; 802, arc frame; 803, filter screen; 9, cleaning mechanism; 901, motor; 902, rotating rod; 903, fixing block; 904, connecting rod; 905, cleaning brush; 10, secondary conveying pipe; 11, L-shaped bracket; 12, rotating rod; 13, baffle; 14, fixing ring. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example:

[0037] Reference Figure 1-6A waste heat recovery device for a thermal power plant comprises a base 1, a flue gas conveying mechanism 2 is arranged on the left side of the upper end of the base 1, a primary filtering mechanism 8 is arranged inside the flue gas conveying mechanism 2, a cleaning mechanism 9 is arranged on the relatively inner side of the primary filtering mechanism 8, a support frame 3 is fixedly connected to the right side of the upper end of the base 1, a heat exchange and heat preservation mechanism 4 is arranged on the upper end of the support frame 3, and a filtering mechanism 5 is arranged on the upper end of the heat exchange and heat preservation mechanism 4; the flue gas conveying mechanism 2 comprises an air inlet pipe 201, a conveying box 202 is fixedly connected to the left side of the air inlet pipe 201, a conveying pipe 206 is fixedly connected to the right side of the air inlet pipe 201, and the primary filtering mechanism 8 comprises an upper cover Plate 801, the lower end of the upper cover plate 801 is fixedly connected with an arc frame 802, the inner wall of the arc frame 802 is fixedly connected with a filter screen 803, the upper cover plate 801 is clamped with the upper end of the smoke conveying mechanism 2, the arc frame 802 and the filter screen 803 are pulled out by pulling the upper cover plate 801, and the filter screen 803 can be replaced. At the same time, when the filter screen 803 is placed inside the air inlet pipe 201, the smoke entering the conveying box 202 can be filtered, and the primary filtering mechanism 8 can be fixedly placed by clamping the upper cover plate 801, and a gap is left between the primary filtering mechanism 8 and the smoke conveying mechanism 2 to allow the smoke inside the smoke conveying mechanism 2 to overflow.

[0038] Reference Figure 1-6 A cleaning mechanism 9 is provided at the inner middle end of the air inlet pipe 201, and the cleaning mechanism 9 includes a motor 901. A rotating rod 902 is fixedly connected to the output end of the motor 901, and a fixed block 903 is fixedly connected to the outer end of the rotating rod 902. A connecting rod 904 is fixedly connected to the left side of the fixed block 903, and a cleaning brush 905 is fixedly connected to the left side of the connecting rod 904. The cleaning brush 905 is abutted against the filter 803, and the rotating rod 902 is driven to rotate by the motor 901, and the cleaning brush 905 is driven to rotate by the fixed block 903 and the connecting rod 904, and the mesh of the filter 803 is cleaned by the abutment between the cleaning brush 905 and the filter 803.

[0039] Reference Figure 1-6 The heat exchange and insulation mechanism 4 includes a heat exchange inner cylinder 401, the upper and lower ends of the heat exchange inner cylinder 401 are fixedly connected with a lower insulation bucket 402, the upper end of the delivery pipe 206 is fixedly connected with the lower end of the lower insulation bucket 402, the delivery pipe 206 passes through the lower insulation bucket 402 and the bottom end of the heat exchange inner cylinder 401 is fixedly connected with a flue gas delivery spiral pipe 404, the upper end of the heat exchange inner cylinder 401 is fixedly connected with a water inlet pipe, cold water is delivered to the interior of the heat exchange inner cylinder 401 through the water inlet pipe, hot gas is delivered to the interior of the flue gas delivery spiral pipe 404 through the delivery pipe 206, and the cold water inside the heat exchange inner cylinder 401 is heated by the flue gas delivery spiral pipe 404.

[0040] Reference Figure 1-6The outer end of the heat exchange inner cylinder 401 is fixedly connected to the outer insulation box 403, the upper left end of the outer insulation box 403 is fixedly connected to the ventilation pipe 407, a one-way valve 1 is arranged inside the ventilation pipe 407, the upper end of the outer insulation box 403 is fixedly connected to the support frame 7, the support frame 7 can support the filtering mechanism 5, the ventilation pipe 407 can transmit the smoke inside the outer insulation box 403 to the outside through the one-way valve 1, and prevent the external cold from entering the inside of the outer insulation box 403.

[0041] Reference Figure 1-6 The filtering mechanism 5 includes a filter frame 501, and a lower conveying plate 508 is fixedly connected to the inner bottom end of the filter frame 501, and the lower end of the lower conveying plate 508 is fixedly connected to the upper end of the smoke conveying spiral tube 404, and an upper suction cup 509 is fixedly connected to the inner upper end of the filter frame 501, and the upper end of the upper suction cup 509 is fixedly connected to the suction pump 6, and the right side of the suction pump 6 is fixedly connected to the secondary conveying pipe 10, and the lower end of the secondary conveying pipe 10 is fixedly connected to the lower end of the right side of the outer insulation box 403. A one-way valve 2 is arranged on the inner wall of the secondary conveying pipe 10 close to the right side of the outer insulation box 403, and the lower conveying plate 508 conveys and diffuses the hot air, and then absorbs the filtered hot air through the upper suction cup 509, and then it can be extracted through the suction pump 6, and then transported to the inside of the outer insulation box 403 through the secondary conveying pipe 10.

[0042] Reference Figure 1-6 The inner wall of the filter frame 501 is fixedly connected with a concave groove 505, and the interior of the concave groove 505 is slidably connected with a sliding frame 506, and activated carbon 507 is arranged inside the sliding frame 506. The relatively inner front end of the filter frame 501 is fixedly connected with a sealing concave strip 503, and the front end of the filter frame 501 is hinged with a box door 502, and the end of the box door 502 close to the filter frame 501 is fixedly connected with a sealing strip 504, and the sealing strip 504 is snap-fitted with the sealing concave strip 503. The sliding frame 506 and the concave groove 505 can slide out by sliding, and the activated carbon 507 is filled into the interior of the sliding frame 506 to filter the waste heat flue gas again.

[0043] Reference Figure 1-6 The front end of the right side of the filter frame 501 is hung with an L-shaped bracket 11, and the front right side of the box door 502 is fixedly connected with a rotating rod 12. The outer end of the rotating rod 12 is rotatably connected with a baffle 13, and the outer ends of the rotating rod 12 located on both sides of the baffle 13 are fixedly connected with fixing rings 14. When the box door 502 and the filter frame 501 are closed, the baffle 13 is rotated to rotate the right side of the baffle 13 to the inside of the L-shaped bracket 11, so that the box door 502 can be fixed.

[0044] Reference Figure 1-6A sewage pipe 204 is fixedly connected to the middle part of the lower end of the air inlet pipe 201, and a one-way valve three is arranged inside the sewage pipe 204. An inclined plate 205 is fixedly connected to the right side of the interior of the air inlet pipe 201. A supporting leg 203 is fixedly connected to the lower end of the air inlet pipe 201. The dust cleaned by the filter 803 can be transported out through the sewage pipe 204, and the one-way valve three can reduce the external cold air from entering the interior of the air inlet pipe 201.

[0045] Reference Figure 1-6 The lower right end of the heat exchange inner cylinder 401 is fixedly connected with a drain pipe 405, and a manual valve 406 is provided at the upper end of the drain pipe 405. The outer end of the lower insulation bucket 402 is fixedly connected to the middle end of the support frame 3. The hot water heated inside the heat exchange inner cylinder 401 can be transported by manually rotating the manual valve 406 and the drain pipe 405.

[0046] Reference Figure 1-6 The outer insulation box 403 is hollow, and an asbestos board is fixedly connected to the outer end of the outer insulation box 403. The primary filtering mechanism 8 is composed of two groups. The filter screen 803 near one end of the support frame 3 is a fine mesh. The asbestos board can insulate the outer insulation box 403. At the same time, the residual heat in the hollow part of the outer insulation box 403 can be used to perform secondary insulation on the inside of the heat exchange inner cylinder 401.

[0047] The implementation principle of a waste heat recovery device for a thermal power plant according to the present invention is as follows:

[0048] When the waste heat recovery device applied to a thermal power plant is used, the delivery box 202 is connected to the waste heat pipe, so that the hot air generated during thermal power generation is delivered to the inside of the intake pipe 201 through the delivery box 202. After the flue gas enters the inside of the intake pipe 201, the flue gas is filtered by the arc frame 802 inside the intake pipe 201. During filtering, the motor 901 drives the rotating rod 902 to rotate, and the fixing block 903 and the connecting rod 904 drive the cleaning brush 905 to rotate. The cleaning brush 905 and the filter 803 are abutted against each other to clean the mesh of the filter 803, and the filtered flue gas is delivered to the heat exchanger through the delivery pipe 206. Inside the flue gas conveying spiral tube 404 inside the inner tube 401, cold water is conveyed to the inside of the heat exchange inner tube 401 by the water inlet pipe, and the cold water inside the heat exchange inner tube 401 is heated by the flue gas conveying spiral tube 404. The heated flue gas is discharged upward through the lower conveying plate 508, and is filtered by the activated carbon 507 when the flue gas rises. The filtered flue gas is then sucked by the suction pump 6, and then conveyed to the inside of the outer insulation box 403 through the secondary conveying pipe 10, and the outer end of the heat exchange inner tube 401 is insulated and heated by the outer insulation box 403. Through the cooperation of the above structures, the flue gas is preliminarily filtered, and the waste heat is repeatedly utilized.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waste heat recovery device for a thermal power plant, comprising a base (1), characterized in that: A smoke conveying mechanism (2) is arranged on the left side of the upper end of the base (1), a primary filtering mechanism (8) is arranged inside the smoke conveying mechanism (2), a cleaning mechanism (9) is arranged on the inner side of the primary filtering mechanism (8), a support frame (3) is fixedly connected to the right side of the upper end of the base (1), a heat exchange and heat preservation mechanism (4) is arranged on the upper end of the support frame (3), and a filtering mechanism (5) is arranged on the upper end of the heat exchange and heat preservation mechanism (4); The smoke conveying mechanism (2) comprises an air intake pipe (201), the left side of the air intake pipe (201) is fixedly connected to a conveying box (202), the right side of the air intake pipe (201) is fixedly connected to a conveying pipe (206), the primary filtering mechanism (8) comprises an upper cover plate (801), the lower end of the upper cover plate (801) is fixedly connected to an arc frame (802), the inner wall of the arc frame (802) is fixedly connected to a filter screen (803), and the upper cover plate (801) is clamped to the upper end of the smoke conveying mechanism (2).

2. A waste heat recovery device for a thermal power plant according to claim 1, characterized in that: A cleaning mechanism (9) is provided at the inner middle end of the air inlet pipe (201), and the cleaning mechanism (9) comprises a motor (901), the output end of the motor (901) is fixedly connected to a rotating rod (902), the outer end of the rotating rod (902) is fixedly connected to a fixing block (903), the left side of the fixing block (903) is fixedly connected to a connecting rod (904), the left side of the connecting rod (904) is fixedly connected to a cleaning brush (905), and the cleaning brush (905) abuts against the filter (803).

3. A waste heat recovery device for a thermal power plant according to claim 1, characterized in that: The heat exchange and heat preservation mechanism (4) comprises a heat exchange inner cylinder (401), the upper and lower ends of the heat exchange inner cylinder (401) are fixedly connected to a lower heat preservation bucket (402), the upper end of the delivery pipe (206) is fixedly connected to the lower end of the lower heat preservation bucket (402), the delivery pipe (206) passes through the lower heat preservation bucket (402) and the bottom end of the heat exchange inner cylinder (401) is fixedly connected to a flue gas delivery spiral pipe (404), and the upper end of the heat exchange inner cylinder (401) is fixedly connected to a water inlet pipe.

4. A waste heat recovery device for a thermal power plant as claimed in claim 3, characterized in that: The outer end of the heat exchange inner cylinder (401) is fixedly connected to an outer insulation box (403), the upper left end of the outer insulation box (403) is fixedly connected to a ventilation pipe (407), a one-way valve 1 is arranged inside the ventilation pipe (407), and the upper end of the outer insulation box (403) is fixedly connected to a support frame (7).

5. A waste heat recovery device for a thermal power plant as claimed in claim 4, characterized in that: The filtering mechanism (5) comprises a filtering frame (501), the inner bottom end of the filtering frame (501) is fixedly connected with a lower conveying plate (508), the lower end of the lower conveying plate (508) is fixedly connected with the upper end of the smoke conveying spiral tube (404), the inner upper end of the filtering frame (501) is fixedly connected with an upper suction cup (509), the upper end of the upper suction cup (509) is fixedly connected with a suction pump (6), the right side of the suction pump (6) is fixedly connected with a secondary conveying pipe (10), the lower end of the secondary conveying pipe (10) is fixedly connected with the lower end of the right side of the outer insulation box (403), and a one-way valve 2 is arranged on the inner wall of the secondary conveying pipe (10) close to the right side of the outer insulation box (403).

6. A waste heat recovery device for a thermal power plant as claimed in claim 5, characterized in that: The inner wall of the filter frame (501) is fixedly connected with a concave groove (505), the interior of the concave groove (505) is slidably connected with a sliding frame (506), the interior of the sliding frame (506) is provided with activated carbon (507), the relatively inner front end of the filter frame (501) is fixedly connected with a sealing concave strip (503), the front end of the filter frame (501) is hinged with a box door (502), and one end of the box door (502) close to the filter frame (501) is fixedly connected with a sealing strip (504), and the sealing strip (504) is snap-fitted with the sealing concave strip (503).

7. A waste heat recovery device for a thermal power plant as claimed in claim 6, characterized in that: The front end of the right side of the filter frame (501) is hung with an L-shaped bracket (11), the front right side of the door (502) is fixedly connected with a rotating rod (12), the outer end of the rotating rod (12) is rotatably connected with a baffle (13), and the outer ends of the rotating rod (12) located on both sides of the baffle (13) are fixedly connected with fixing rings (14).

8. A waste heat recovery device for a thermal power plant as claimed in claim 7, characterized in that: A sewage pipe (204) is fixedly connected to the middle of the lower end of the air intake pipe (201), a one-way valve (3) is arranged inside the sewage pipe (204), an inclined plate (205) is fixedly connected to the right side of the interior of the air intake pipe (201), and a support leg (203) is fixedly connected to the lower end of the air intake pipe (201).

9. A waste heat recovery device for a thermal power plant as claimed in claim 8, characterized in that: A drainage pipe (405) is fixedly connected to the lower right end of the heat exchange inner cylinder (401), a manual valve (406) is provided at the upper end of the drainage pipe (405), and the outer end of the lower insulation bucket (402) is fixedly connected to the middle end of the support frame (3).

10. A waste heat recovery device for a thermal power plant as claimed in claim 9, characterized in that: The outer heat preservation box (403) is hollow, and an asbestos board is fixedly connected to the outer end of the outer heat preservation box (403). The primary filtering mechanism (8) is composed of two groups, and the filter screen (803) close to one end of the support frame (3) is a fine mesh.

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