Waste heat recovery device for thermal power plant

Abstract

The utility model 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 support 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 application belongs to the technical field of waste heat recovery, and particularly relates to a waste heat recovery device for a thermal power plant. BACKGROUND

[0002] High-temperature steam is generated in the working process of a steam turbine of a thermal power plant, and the existing treatment method for the high-temperature steam includes direct discharge and condensation. Neither of the above two methods effectively recovers the heat energy in the high-temperature steam, resulting in energy waste.

[0003] 1. In the existing flue gas waste heat recovery device, dust particles in the flue gas are easily adhered to the heat-conducting plate during the recovery of the waste heat of the flue gas, which is difficult to clean and has poor use effect, affecting heat absorption.

[0004] 2. In actual use, the flue gas pipeline is directly introduced into the cold water in the recovery tank, the recovery efficiency is not high, and after the recovery and utilization are completed, the flue gas is directly discharged without any purification treatment, which causes certain pollution to the environment. SUMMARY

[0005] The application aims to solve the above problems and provide a waste heat recovery device for a thermal power plant.

[0006] The application adopts the following technical scheme: a waste heat recovery device for a thermal power plant, comprising a base, a flue gas conveying mechanism is arranged on the upper end of the left side of the base, an initial filtering mechanism is arranged in the flue gas conveying mechanism, a cleaning mechanism is arranged on the opposite inner side of the initial filtering mechanism, a support frame is fixedly connected to the upper end of the right side of the base, a heat exchange and heat preservation 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 heat preservation mechanism.

[0007] Through the above technical scheme, the arc-shaped frame and the filter screen are pulled out by the upper cover plate, the filter screen can be replaced, the flue gas entering the conveying tank can be filtered after the filter screen is placed in the inside of the air inlet pipe, the initial filtering mechanism can be fixedly placed through the clamping of the upper cover plate, and the initial filtering mechanism and the flue gas conveying mechanism have a gap, so that the flue gas in the inside of the flue gas conveying mechanism can overflow.

[0008] In a preferred implementation form, the inner end of the air inlet pipe is provided with a cleaning mechanism, the cleaning mechanism comprises a motor, the output end of the motor is fixedly connected with a first rotating rod, the outer end of the first rotating rod is fixedly connected with a fixed block, the left side of the fixed block is fixedly connected with a connecting rod, the left side of the connecting rod is fixedly connected with a cleaning brush, and the cleaning brush abuts against the filter screen.

[0009] By adopting the above technical scheme, the first rotating rod is driven to rotate by the motor, the cleaning brush is driven to rotate by the fixed block and the connecting rod, and the mesh holes of the filter screen are cleaned by the abutment of the cleaning brush and the filter screen.

[0010] In a preferred implementation form, the heat exchange and heat preservation mechanism comprises a heat exchange inner cylinder, the upper and lower ends of the heat exchange inner cylinder are fixedly connected with a lower heat preservation hopper, the upper end of the conveying pipe is fixedly connected with the lower end of the lower heat preservation hopper, the bottom end of the conveying pipe penetrating through the lower heat preservation hopper and the heat exchange inner cylinder is fixedly connected with a flue gas conveying spiral pipe, and the upper end of the heat exchange inner cylinder is fixedly connected with a water inlet pipe.

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

[0012] In a preferred implementation form, the outer end of the heat exchange inner cylinder is fixedly connected with an outer heat preservation box, the left upper end of the outer heat preservation box is fixedly connected with an air pipe, the inside of the air pipe is provided with a one-way valve one, and the upper end of the outer heat preservation box is fixedly connected with a support frame.

[0013] By adopting the above technical scheme, the support frame can support the filtering mechanism, the air pipe can output the flue gas in the inside of the outer heat preservation box through the one-way valve one, and the cold air outside is prevented from entering the inside of the outer heat preservation box.

[0014] In a preferred implementation form, the filtering mechanism comprises a filtering frame, the inside bottom end of the filtering frame is fixedly connected with a lower conveying disc, the lower end of the lower conveying disc is fixedly connected with the upper end of the flue gas conveying spiral pipe, the inside upper end of the filtering frame is fixedly connected with an upper suction disc, the upper end of the upper suction disc is fixedly connected with a suction pump, the right side of the suction pump is fixedly connected with a secondary conveying pipe, the lower end of the secondary conveying pipe is fixedly connected with the right lower end of the outer heat preservation box, and the secondary conveying pipe is provided with a one-way valve two close to the inner wall of the right side of the outer heat preservation box.

[0015] By adopting the above technical scheme, the hot gas is conveyed and diffused by the lower conveying disc, the filtered hot gas is sucked by the upper suction disc, the suction pump is used for sucking during the sucking, and the hot gas is conveyed to the inside of the outer heat preservation 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 inside of the concave groove is slidably connected with a sliding frame, the inside of the sliding frame is provided with activated carbon, the opposite inner side of the front end of the filter frame is fixedly connected with a sealing concave strip, the front end of the filter frame is hingedly connected 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 scheme, the sliding frame can be slid out through the sliding of the sliding frame and the concave groove, and the activated carbon filled into the inside of the sliding frame can filter the waste heat flue gas again.

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

[0019] By adopting the above technical scheme, when the box door and the filter frame are closed, the right side of the baffle is rotated to the inside of the L-shaped support by rotating the baffle, so that the box door can be fixed.

[0020] In a preferred embodiment, the lower middle part of the air inlet pipe is fixedly connected with a blowdown pipe, the inside of the blowdown pipe is provided with a one-way valve three, the right side of the inside of the air inlet pipe is fixedly connected with an inclined plate, and the lower end of the air inlet pipe is fixedly connected with a supporting leg.

[0021] By adopting the above technical scheme, the dust cleaned by the filter screen can be externally transported through the blowdown pipe, and the external cold air entering the inside of the air inlet pipe can be reduced through the one-way valve three.

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

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

[0024] In a preferred embodiment, the outer heat preservation box is hollow, the outer end of the outer heat preservation box is fixedly connected with an asbestos board, and the primary filtering mechanism is two groups, and the filter screen close to one end of the supporting frame is a fine mesh.

[0025] By adopting the above technical scheme, the asbestos board can heat preserve the outer heat preservation box, and the waste heat in the hollow part of the outer heat preservation box can perform secondary heat preservation on the inside of the heat exchange inner cylinder.

[0026] To sum up, due to the adoption of the above technical scheme, the present application has the following beneficial effects:

[0027] In the present application, the heat transfer box is connected with the waste heat pipe, so that the hot gas generated during the thermal power generation is transferred to the inside of the air inlet pipe through the heat transfer box. After the flue gas enters the inside of the air inlet pipe, the flue gas is filtered by the arc-shaped frame inside the air inlet pipe. During the filtering process, the first rotating rod is driven to rotate by the motor, the cleaning brush is driven to rotate by the fixing block and the connecting rod, the mesh holes of the filter screen are cleaned by the abutting of the cleaning brush and the filter screen, the filtered flue gas is transferred to the inside of the flue gas transfer spiral pipe in the heat exchange inner cylinder by the transfer pipe, the cold water is transferred to the inside of the heat exchange inner cylinder by the water inlet pipe, the cold water in the heat exchange inner cylinder is heated by the flue gas transfer spiral pipe, the heated flue gas is discharged upward by the lower transfer disc, the flue gas is filtered by the activated carbon when rising, the filtered flue gas is sucked by the suction pump, and then is transferred to the inside of the external insulation box by the secondary transfer pipe. The external insulation box insulates and heats the outer end of the heat exchange inner cylinder. Through the cooperation of the above structure, the flue gas is preliminarily filtered, and the waste heat is repeatedly utilized. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

[0031] Figure 4 It is an enlarged view of A in the present application; Figure 2

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

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

[0034] ​Marked in the figure: 1, base; 2, flue gas conveying mechanism; 201, air inlet pipe; 202, conveying box; 203, supporting leg; 204, blowdown pipe; 205, swash plate; 206, conveying pipe; 3, supporting frame; 4, heat exchange and heat preservation mechanism; 401, heat exchange inner cylinder; 402, lower heat preservation hopper; 403, outer heat preservation box; 404, flue gas conveying spiral pipe; 405, drain pipe; 406, hand valve; 407, air pipe; 5, filtering mechanism; 501, filtering frame; 502, box door; 503, sealing concave strip; 504, sealing strip; 505, concave groove; 506, sliding frame; 507, activated carbon; 508, lower conveying disc; 509, upper suction disc; 6, suction pump; 7, supporting frame; 8, primary filtering mechanism; 801, upper cover plate; 802, arc-shaped frame; 803, filter screen; 9, cleaning mechanism; 901, motor; 902, first rotating rod; 903, fixed block; 904, connecting rod; 905, cleaning brush; 10, secondary conveying pipe; 11, L-shaped support; 12, second rotating rod; 13, baffle; 14, fixed ring. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0036] Embodiment:

[0037] Reference Figures 1-6The utility model provides a kind of thermal power plant waste heat recovery device, including base 1, the upper end left side of base 1 is provided with flue gas conveying mechanism 2, the inside of flue gas conveying mechanism 2 is provided with primary filtration mechanism 8, the opposite inner side of primary filtration mechanism 8 is provided with cleaning mechanism 9, the upper end right side of base 1 is fixedly connected with support frame 3, the upper end of support frame 3 is provided with heat exchange insulation mechanism 4, and the upper end of heat exchange insulation mechanism 4 is provided with filter mechanism 5;Flue gas conveying mechanism 2 includes air inlet pipe 201, the left side of air inlet pipe 201 is fixedly connected with conveying box 202, the right side of air inlet pipe 201 is fixedly connected with conveying pipe 206, primary filtration mechanism 8 includes upper cover plate 801, and the lower end of upper cover plate 801 is fixedly connected with arc frame 802, and the inner wall of arc frame 802 is fixedly connected with filter screen 803, and upper cover plate 801 is connected with the upper end of flue gas conveying mechanism 2, and arc frame 802 and filter screen 803 are extracted by pulling upper cover plate 801, and filter screen 803 can be replaced, and the flue gas entering conveying box 202 can be filtered after being placed in the inside of air inlet pipe 201, and the flue gas in the inside of flue gas conveying mechanism 2 can overflow by the clamping of upper cover plate 801, and primary filtration mechanism 8 is fixedly placed with the gap between primary filtration mechanism 8 and flue gas conveying mechanism 2, so that the flue gas in the inside of flue gas conveying mechanism 2 can overflow.

[0038] Refer to Figures 1-6 The inside middle end of air inlet pipe 201 is provided with cleaning mechanism 9, and cleaning mechanism 9 includes motor 901, the output end of motor 901 is fixedly connected with first rotating rod 902, the outer end of first rotating rod 902 is fixedly connected with fixed block 903, the left side of fixed block 903 is fixedly connected with connecting rod 904, the left side of connecting rod 904 is fixedly connected with cleaning brush 905, and cleaning brush 905 is in abutment with filter screen 803, and first rotating rod 902 is rotated by motor 901, and cleaning brush 905 is rotated by fixed block 903 and connecting rod 904, and the mesh of filter screen 803 is cleaned by the abutment of cleaning brush 905 and filter screen 803.

[0039] Refer to Figures 1-6 Heat exchange insulation mechanism 4 includes heat exchange inner cylinder 401, and lower heat preservation hopper 402 is fixedly connected to the upper and lower ends of heat exchange inner cylinder 401, and the upper end of conveying pipe 206 is fixedly connected to the lower end of lower heat preservation hopper 402, and flue gas conveying spiral pipe 404 is fixedly connected to the bottom end of lower heat preservation hopper 402 and heat exchange inner cylinder 401, which is penetrated by conveying pipe 206, and the upper end of heat exchange inner cylinder 401 is fixedly connected with water inlet pipe, cold water is conveyed into the inside of heat exchange inner cylinder 401 through water inlet pipe, hot gas is conveyed into the inside of flue gas conveying spiral pipe 404 through conveying pipe 206, and the cold water in the inside of heat exchange inner cylinder 401 is heated by flue gas conveying spiral pipe 404.

[0040] Refer to Figures 1-6The outer end of the heat exchange inner cylinder 401 is fixedly connected with an outer heat preservation box 403, the left side upper end of the outer heat preservation box 403 is fixedly connected with a breather pipe 407, the inside of the breather pipe 407 is provided with a one-way valve one, the upper end of the outer heat preservation box 403 is fixedly connected with a support frame 7, the support frame 7 can support the filtering mechanism 5, the breather pipe 407 can output the flue gas inside the outer heat preservation box 403 through the one-way valve one, and meanwhile, the external cold air is prevented from entering the inside of the outer heat preservation box 403.

[0041] With reference to Figures 1-6 The filtering mechanism 5 comprises a filtering frame 501, the inside bottom end of the filtering frame 501 is fixedly connected with a lower conveying disc 508, the lower end of the lower conveying disc 508 is fixedly connected with the upper end of the flue gas conveying spiral pipe 404, the inside upper end of the filtering frame 501 is fixedly connected with an upper suction disc 509, the upper end of the upper suction disc 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 right side lower end of the outer heat preservation box 403, the secondary conveying pipe 10 is provided with a one-way valve two close to the inner wall of the right side of the outer heat preservation box 403, the hot gas is diffused through the lower conveying disc 508, then the filtered hot gas is sucked through the upper suction disc 509, and then the suction pump 6 is used for sucking, and the hot gas is conveyed to the inside of the outer heat preservation box 403 through the secondary conveying pipe 10.

[0042] With reference to Figures 1-6 The inner wall of the filtering frame 501 is fixedly connected with a concave groove 505, the inside of the concave groove 505 is slidably connected with a sliding frame 506, the inside of the sliding frame 506 is provided with activated carbon 507, the opposite inner side front end of the filtering frame 501 is fixedly connected with a sealing concave strip 503, the front end of the filtering frame 501 is hingedly connected with a box door 502, the box door 502 is fixedly connected with a sealing strip 504 close to one end of the filtering frame 501, the sealing strip 504 is clamped with the sealing concave strip 503, the sliding frame 506 is slid out through the sliding of the sliding frame 506 and the concave groove 505, and the activated carbon 507 filled into the inside of the sliding frame 506 can filter the flue gas again.

[0043] With reference to Figures 1-6 The right side front end of the filtering frame 501 is hungly connected with an L-shaped support 11, the front right side of the box door 502 is fixedly connected with a second rotating rod 12, the outer end of the second rotating rod 12 is rotatably connected with a baffle 13, the outer ends of the second rotating rod 12 located on both sides of the baffle 13 are fixedly connected with fixed rings 14, when the box door 502 and the filtering frame 501 are closed, the right side of the baffle 13 is rotated to the inside of the L-shaped support 11 by rotating the baffle 13, and the box door 502 can be fixed.

[0044] With reference to Figures 1-6The lower middle part of the air inlet pipe 201 is fixedly connected with a blowdown pipe 204, the inside of the blowdown pipe 204 is provided with a one-way valve three, the inside of the air inlet pipe 201 is fixedly connected with an inclined plate 205 on the right side, the lower end of the air inlet pipe 201 is fixedly connected with a supporting leg 203, the dust cleaned by the filter screen 803 can be externally transported through the blowdown pipe 204, and the external cold air entering the inside of the air inlet pipe 201 can be reduced through the one-way valve three.

[0045] Referring to Figures 1-6 The lower right end of the heat exchange inner cylinder 401 is fixedly connected with a drain pipe 405, the upper end of the drain pipe 405 is provided with a manual valve 406, the outer end of the lower heat preservation bucket 402 is fixedly connected with the middle end of the supporting frame 3, and the manually rotating rod manual valve 406 and the drain pipe 405 can transport the hot water heated in the inside of the heat exchange inner cylinder 401.

[0046] Referring to Figures 1-6 The outer end of the outer heat preservation box 403 is fixedly connected with an asbestos board, the primary filtering mechanism 8 is two groups, the filter screen 803 close to one end of the supporting frame 3 is a fine mesh, and the asbestos board can heat preserve the outer heat preservation box 403, and the waste heat in the hollow part of the outer heat preservation box 403 can perform secondary heat preservation on the inside of the heat exchange inner cylinder 401.

[0047] The implementation principle of the embodiment of the waste heat recovery device for thermal power plants is as follows:

[0048] When the waste heat recovery device applied to the thermal power plant is used, the conveying box 202 is connected with the waste heat pipe, the hot gas generated during thermal power generation is conveyed to the inside of the air inlet pipe 201 through the conveying box 202, the smoke gas is filtered through the arc-shaped frame 802 in the inside of the air inlet pipe 201, the first rotating rod 902 is driven to rotate by the motor 901 during filtering, the cleaning brush 905 is driven to rotate through the fixed block 903 and the connecting rod 904, the mesh of the filter screen 803 is cleaned through the abutting of the cleaning brush 905 and the filter screen 803, the filtered smoke gas is conveyed to the inside of the smoke gas conveying spiral pipe 404 in the inside of the heat exchange inner cylinder 401 through the conveying pipe 206, the cold water is conveyed to the inside of the heat exchange inner cylinder 401 through the water inlet pipe, the cold water in the inside of the heat exchange inner cylinder 401 is heated through the smoke gas conveying spiral pipe 404, the heated smoke gas is discharged upward through the lower conveying disc 508, the activated carbon 507 is used for filtering when the smoke gas rises, the filtered smoke gas is sucked through the suction pump 6, and is conveyed to the inside of the outer heat preservation box 403 through the secondary conveying pipe 10, and the outer end of the heat exchange inner cylinder 401 is heat preserved and heated by the outer heat preservation box 403; through the cooperation of the above structure, the smoke gas is preliminarily filtered, and the waste heat is repeatedly utilized.

[0049] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A waste heat recovery device for thermal power plants, comprising a base (1), characterized in that: The upper end left side of the base (1) is provided with flue gas conveying mechanism (2), the inside of flue gas conveying mechanism (2) is provided with primary filtration mechanism (8), the opposite inner side of primary filtration mechanism (8) is provided with cleaning mechanism (9), the upper end right side of base (1) is fixedly connected with support frame (3), the upper end of support frame (3) is provided with heat exchange insulation mechanism (4), the upper end of heat exchange insulation mechanism (4) is provided with filter mechanism (5); The flue gas conveying mechanism (2) includes an air inlet pipe (201), the left side of the air inlet pipe (201) is fixedly connected with a conveying box (202), the right side of the air inlet pipe (201) is fixedly connected with a conveying pipe (206), the primary filtration mechanism (8) includes an upper cover plate (801), the lower end of the upper cover plate (801) is fixedly connected with an arc-shaped frame (802), the inner wall of the arc-shaped frame (802) is fixedly connected with a filter screen (803), and the upper cover plate (801) is clamped with the upper end of the flue gas conveying mechanism (2).

2. A waste heat recovery device for a thermal power plant according to claim 1, characterized in that: The inside of the air inlet pipe (201) is provided with a cleaning mechanism (9), the cleaning mechanism (9) includes a motor (901), the output end of the motor (901) is fixedly connected with a first rotating rod (902), the outer end of the first rotating rod (902) is fixedly connected with a fixed block (903), the left side of the fixed block (903) is fixedly connected with a connecting rod (904), the left side of the connecting rod (904) is fixedly connected with a cleaning brush (905), and the cleaning brush (905) is in abutment with the filter screen (803).

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

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

5. A waste heat recovery device for a thermal power plant according to claim 4, characterized in that: The filter mechanism (5) includes a filter frame (501), the lower end of the inside of the filter frame (501) is fixedly connected with a lower conveying disc (508), the lower end of the lower conveying disc (508) is fixedly connected with the upper end of the flue gas conveying spiral pipe (404), the upper end of the inside of the filter frame (501) is fixedly connected with an upper suction disc (509), the upper end of the upper suction disc (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 right lower end of the outer heat preservation box (403), and the secondary conveying pipe (10) is provided with a one-way valve two close to the inner wall of the right side of the outer heat preservation box (403).

6. A waste heat recovery device for a thermal power plant according to claim 5, characterized in that: The inner wall of the filter frame (501) is fixedly connected with a concave groove (505), the inside of the concave groove (505) is slidably connected with a sliding frame (506), the inside of the sliding frame (506) is provided with activated carbon (507), the opposite inner side of the 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 hingedly connected with a box door (502), 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 clamped with the sealing concave strip (503).

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

8. A waste heat recovery device for a thermal power plant according to claim 7, characterized in that: The lower end of the air inlet pipe (201) is fixedly connected with a blowdown pipe (204), the inside of the blowdown pipe (204) is provided with a one-way valve three, the inside of the right side of the air inlet pipe (201) is fixedly connected with an inclined plate (205), and the lower end of the air inlet pipe (201) is fixedly connected with a supporting leg (203).

9. A waste heat recovery device for a thermal power plant according to claim 8, characterized in that: The right lower end of the heat exchange inner cylinder (401) is fixedly connected with a drain pipe (405), the upper end of the drain pipe (405) is provided with a hand valve (406), and the outer end of the lower heat preservation hopper (402) is fixedly connected with the middle end of the supporting frame (3).

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

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