Combined heat and power generation flue gas waste heat recovery device

Abstract

The utility model relates to the technical field of waste heat recovery, in particular to a combined heat and power generation flue gas waste heat recovery device which comprises a gas inlet pipe, a combined filtering mechanism arranged at the output end of the gas inlet pipe, a gas conveying pipe arranged at the rear end of the top of the combined filtering mechanism, a waste heat recovery automatic control mechanism arranged at the output end of the gas conveying pipe and an auxiliary water tank arranged on the right side of the waste heat recovery automatic control mechanism. According to the combined heat and power generation flue gas waste heat recovery device, through the arrangement of the combined filtering mechanism, when the combined heat and power generation flue gas waste heat recovery device is used, flue gas can be thoroughly filtered, pipeline blockage is avoided, the heat and power generation efficiency is improved, and the heat and power generation efficiency is improved. And long-term stable operation of the whole waste heat recovery system is ensured.

Description

TECHNICAL FIELD

[0001] The utility model mainly relates to the technical field of waste heat recovery, specifically is a kind of heat and power cogeneration flue gas waste heat recovery device. BACKGROUND

[0002] Heat and power cogeneration flue gas waste heat recovery refers to the process of recycling the waste heat in the flue gas generated in the heat and power cogeneration process through a certain heat exchange method. The main purpose of flue gas waste heat recovery is to convert the heat carried by flue gas into usable heat, thereby improving energy utilization efficiency and reducing enterprise energy consumption and production costs.

[0003] After searching, the utility model patent with publication number CN212657750U discloses a flue gas waste heat recovery device based on heat and power cogeneration boiler, which comprises a first water tank, a heat exchange pipe is fixedly connected inside the first water tank, a water pump is fixedly connected to the top end of the first water tank, a three-way valve is fixedly connected to the output end of the water pump, a first water outlet pipe is fixedly connected to the side wall of the three-way valve, a second water tank is fixedly connected to one end of the first water outlet pipe, a second water outlet pipe is fixedly connected to the top end of the three-way valve, an exhaust port is arranged at one end of the heat exchange pipe, an exhaust pipe is fixedly connected to one end of the exhaust port, and a dust suction box is fixedly connected to the side wall of the first water tank extending from one end of the exhaust pipe; The patent can provide hot water immediately according to the user's demand or save hot water for future use, which is convenient to use and prevents heat exchange when a water tank needs to save hot water, thereby reducing the recovery efficiency.

[0004] However, the above-mentioned patent technical solution still has the following shortcomings in use:

[0005] 1. When using the above-mentioned patent technical solution, only one filter screen is provided to filter the dust in the flue gas, the filtering effect is not good, and after long-term use, the pipeline is still prone to blockage, and the filter screen is prone to accumulate dust during the filtering process, which causes blockage, eventually causing the flue gas to be unable to pass through, and long-term use will cause the entire waste heat recovery system to be unable to operate;

[0006] 2. When using the above-mentioned patent technical solution, although hot water can be exchanged into the second water tank for heat preservation, the above-mentioned patent technical solution cannot be intelligently controlled, and manual operation is required to store hot water, and when the water in the first water tank is completely heated, it cannot be automatically stored, which is inconvenient for workers to use.

[0007] Therefore, we provide a heat and power cogeneration flue gas waste heat recovery device to solve the defects of the above-mentioned solution. UTILITY MODEL CONTENTS

[0008] The utility model mainly provides a kind of cogeneration flue gas waste heat recovery device, to solve the technical problem presented in the above background technique.

[0009] The utility model solves the above technical problems by using the technical scheme that

[0010] A kind of cogeneration flue gas waste heat recovery device, including air inlet pipe, the air inlet pipe output end is equipped with combined filter mechanism, the combined filter mechanism top rear end is equipped with air pipe, the air pipe output end is equipped with waste heat recovery automatic control mechanism, the waste heat recovery automatic control mechanism right side is equipped with auxiliary water tank, the auxiliary water tank front end is fixedly connected with temperature table, the auxiliary water tank inner wall is fixedly connected with heat preservation layer, the auxiliary water tank inside bottom end right side is fixedly connected with thermometer two.

[0011] Further, the combined filter mechanism includes a primary filter box fixedly connected to the output end of the air inlet pipe, a bracket fixedly connected to the top of the primary filter box, a drive motor fixedly connected to the bottom end of the horizontal part of the bracket, a rotating rod one fixedly connected to the bottom of the output end of the drive motor, a sleeve one fixedly sleeved on the outside of the rotating rod one, a support plate one fixedly connected to the left top inside of the primary filter box, a primary filter screen fixedly connected to the right bottom of the support plate one, an installation sleeve one fixedly sleeved on the outside of the primary filter screen penetrated by the rotating rod one, a support crossbar one fixedly connected to the bottom of both sides of the installation sleeve one, a brush one fixedly connected to the top of the support crossbar one, a communication pipe fixedly connected to the top rear end of the primary filter box, a fine filter box fixedly connected to the output end of the communication pipe, a rotating rod two provided on the top of the fine filter box, a sleeve two fixedly sleeved on the outside of the rotating rod two, a support plate two fixedly connected to the left top inside of the fine filter box, a fine filter screen fixedly connected to the right bottom of the support plate two, an installation sleeve two fixedly sleeved on the outside of the fine filter screen penetrated by the rotating rod two, a support crossbar two fixedly connected to the bottom of both sides of the installation sleeve two, a brush two fixedly connected to the top of the support crossbar two, a collection box fixedly connected to the bottom of both the primary filter box and the fine filter box, a slot provided on the front end of the collection box, a sliding groove provided on the inner wall of both sides of the slot, a collection frame provided inside the slot, a baffle fixedly connected to the front end of the collection frame, a hand pull plate fixedly connected to the center of the front end of the baffle, and a sliding rod fixedly connected to both sides of the collection frame.

[0012] Further, the top of the brush one is fitted with the bottom of the primary filter screen, the top of the brush two is fitted with the bottom of the fine filter screen, the rotating rod one is rotationally connected with the primary filter box and the primary filter screen, the rotating rod two is rotationally connected with the fine filter box and the fine filter screen, and the sleeve one and the sleeve two are drivingly connected through a transmission belt.

[0013] Further, the collecting frame is slidably connected with the grooves in the inner walls of the left and right sides of the slot through the slide rods arranged on the left and right sides, the air conveying pipe is fixedly connected to the top rear end of the fine filter box, and the top of the two collecting frames is respectively communicated with the bottom of the primary filter box and the fine filter box.

[0014] Further, the waste heat recovery automatic control mechanism comprises a recovery box fixedly connected to the output end of the air conveying pipe, a PLC controller fixedly connected to the front right side of the recovery box, a water pipe fixedly connected to the bottom of the front end of the recovery box, a hand valve fixedly sleeved on the outside of the water pipe, an air pump fixedly connected to the bottom right side of the recovery box, a water supplement pipe fixedly connected to the left center of the top of the recovery box, an electric control valve fixedly sleeved on the outside of the water supplement pipe, a water pump fixedly connected to the center of the top of the recovery box, a water delivery pipe fixedly connected to the top of the output end of the water pump, a heat exchange pipe fixedly connected in the recovery box, a liquid level sensor fixedly connected to the left bottom end in the recovery box, and a thermometer one fixedly connected to the right bottom end in the recovery box.

[0015] Further, the input end of the heat exchange pipe is fixedly connected to the output end of the air conveying pipe, the output end of the heat exchange pipe is fixedly connected to the input end of the air pump, and the liquid level sensor, the thermometer one and the electric control valve are electrically connected with the PLC controller.

[0016] Further, the output end of the water delivery pipe is communicated with the inside of the auxiliary water tank, and the thermometer two is electrically connected with the PLC controller and the temperature meter.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] 1.The utility model discloses a combined filtering mechanism is set, and the flue gas enters the preliminary filter box inside through the air inlet pipe first, owing to the principle that the flue gas will float, the flue gas will pass through the bottom of the preliminary filter screen, at this moment, the preliminary filter screen can carry out the primary filtration to the flue gas, filters down some larger dust, and falls into the collecting frame of the preliminary filter box bottom setting, and the flue gas after the preliminary filter screen filtration enters the fine filter box through the communicating pipe, then carries out fine filtration again through the fine filter screen, filters down also smaller dust in it, and falls into the collecting frame of the fine filter box bottom setting, and then discharges through the air conveying pipe, in the process of filtering the flue gas, through the rotation of driving motor and driving the rotation of support cross bar no.

[0019] 2.The utility model discloses a waste heat recovery automatic control mechanism is set, and the flue gas is filtered and enters the heat exchange pipe of recovery tank inside through the air conveying pipe, at this moment, the PLC controller of setting controls electric control valve to open, makes up the water pipe intercommunication, fills the cold water into recovery tank, and after the cold water fills full, liquid level sensor will signal transmission to PLC controller, and PLC controller controls electric control valve to close, and the heat of entering cold water absorbs heat exchange pipe, and through the temperature meter no. to monitor water temperature, when the water in recovery tank boils after heating, PLC controller receives the data of temperature meter no. transmission, and PLC controller controls water pump to open, and the hot water is sent into the water tank inside through the water supply pipe and keeps warm, and then PLC controller controls electric control valve to open again, and fills the new cold water into recovery tank, and continues to heat, avoids heat waste, so that the heat and power cogeneration flue gas waste heat recovery device can automatically control the delivery and supplement of cold and hot water, can automatically store and keep warm, and brings the convenience to the worker use. ACCURACY OF DRAWINGS

[0020] Figure 1 It is the whole structure schematic diagram of the utility model;

[0021] Figure 2 It is the combined filtering mechanism structure schematic diagram of the utility model;

[0022] Figure 3 It is the preliminary filter box and fine filter box inside front view structure schematic diagram of the utility model;

[0023] Figure 4The waste heat recovery self-control mechanism structure schematic view of the utility model shows that

[0024] Figure 5 The recycling box internal front view structure schematic view of the utility model shows that

[0025] In the figure: 1, air inlet pipe; 2, combined filtering mechanism; 201, primary filter box; 202, support; 203, drive motor; 204, slot; 205, chute; 206, collection frame; 207, baffle; 208, hand pull plate; 209, sliding rod; 210, support plate one; 211, primary filter screen; 212, rotating rod one; 213, mounting node one; 214, support cross rod one; 215, brush one; 216, sleeve node one; 217, conveying belt; 218, fine filter box; 219, support plate two; 220, fine filter screen; 221, rotating rod two; 222, mounting node two; 223, support cross rod two; 224, brush two; 225, sleeve node two; 226, collection box; 227, communication pipe; 3, air conveying pipe; 4, waste heat recovery self-control mechanism; 401, recycling box; 402, PLC controller; 403, water pipe; 404, hand screw valve; 405, water replenishing pipe; 406, electric control valve; 407, water pump; 408, water conveying pipe; 409, heat exchange pipe; 410, liquid level sensor; 411, thermometer one; 412, air pump; 5, auxiliary water tank; 501, temperature gauge; 502, heat preservation layer; 503, thermometer two. DETAILED DESCRIPTION

[0026] In order to facilitate understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings, and the drawings show several embodiments of the utility model, but the utility model can be realized by different forms and is not limited to the embodiments described in the text, on the contrary, these embodiments are provided to make the disclosed content of the utility model more thorough and comprehensive.

[0027] Embodiment, please refer to the accompanying Figures 1-5 As shown in the figure, a combined filtering mechanism 2 is arranged at the output end of the air inlet pipe 1, a transmission air pipe 3 is arranged at the top rear end of the combined filtering mechanism 2, a waste heat recovery self-control mechanism 4 is arranged at the output end of the transmission air pipe 3, an auxiliary water tank 5 is arranged at the right side of the waste heat recovery self-control mechanism 4, a temperature gauge 501 is fixedly connected to the front end of the auxiliary water tank 5, a heat preservation layer 502 is fixedly connected to the inner wall of the auxiliary water tank 5, and a thermometer two 503 is fixedly connected to the inner bottom right side of the auxiliary water tank 5.

[0028] The combined filtering mechanism 2 comprises an initial filtering box 201 fixedly connected to the output end of the air inlet pipe 1, a support 202 fixedly connected to the top of the initial filtering box 201, a driving motor 203 fixedly connected to the bottom end of the horizontal part of the support 202, a rotating rod I 212 fixedly connected to the output end of the driving motor 203, a sleeve I 216 fixedly sleeved on the outer side of the rotating rod I 212, a supporting plate I 210 fixedly connected to the top left side in the initial filtering box 201, an initial filtering screen 211 fixedly connected to the bottom right side of the supporting plate I 210, an installation sleeve I 213 fixedly sleeved on the outer side of the rotating rod I 212 penetrating through the initial filtering screen 211, supporting cross rods I 214 fixedly connected to the bottom left and right sides of the installation sleeve I 213, brush I 215 fixedly connected to the top of the supporting cross rods I 214, a communication pipe 227 fixedly connected to the top rear end of the initial filtering box 201, a fine filtering box 218 fixedly connected to the output end of the communication pipe 227, a rotating rod II 221 arranged on the top of the fine filtering box 218, a sleeve II 225 fixedly sleeved on the outer side of the rotating rod II 221, a supporting plate II 219 fixedly connected to the top left side in the fine filtering box 218, a fine filtering screen 220 fixedly connected to the bottom right side of the supporting plate II 219, an installation sleeve II 222 fixedly sleeved on the outer side of the rotating rod II 221 penetrating through the fine filtering screen 220, supporting cross rods II 223 fixedly connected to the bottom left and right sides of the installation sleeve II 222, brush II 224 fixedly connected to the top of the supporting cross rods II 223, a collecting box 226 fixedly connected to the bottom of the initial filtering box 201 and the fine filtering box 218, a slot 204 arranged on the front end of the collecting box 226, sliding grooves 205 arranged on the inner walls of the left and right sides of the slot 204, a collecting frame 206 arranged in the slot 204, a baffle 207 fixedly connected to the front end of the collecting frame 206, a hand plate 208 fixedly connected to the center of the front end of the baffle 207, sliding rods 209 fixedly connected to the left and right sides of the collecting frame 206, the top of the brush I 215 abutting against the bottom of the initial filtering screen 211, the top of the brush II 224 abutting against the bottom of the fine filtering screen 220, the rotating rod I 212 being rotationally connected to the initial filtering box 201 and the initial filtering screen 211, the rotating rod II 221 being rotationally connected to the fine filtering box 218 and the fine filtering screen 220, and the sleeve I 216 and the sleeve II 225 being drivingly connected through a transmission belt 217, the collecting frame 206 being slidingly connected to the sliding grooves 205 arranged on the inner walls of the left and right sides of the slot 204 through the sliding rods 209 arranged on the left and right sides of the collecting frame 206, an air transmission pipe 3 being fixedly connected to the top rear end of the fine filtering box 218, and the tops of the two collecting frames 206 being communicated with the bottoms of the initial filtering box 201 and the fine filtering box 218 respectively, flue gas entering the initial filtering box 201 through the air inlet pipe 1, the flue gas passing through the bottom of the initial filtering screen 211 due to the principle that flue gas itself will float up, the initial filtering screen 211 arranged at this time being capable of preliminarily filtering the flue gas, filtering down some larger dust into the collecting frame 206 arranged at the bottom of the initial filtering box 201, the flue gas filtered through the initial filtering screen 211 entering the fine filtering box 218 through the communication pipe 227, then being fine filtered through the fine filtering screen 220, filtering down smaller dust,And fall into the collection frame 206 set in the bottom of the fine filter box 218, and then through the air pipe 3 discharge, in the process of filtering flue gas, by starting the drive motor 203 drive pole 212 rotation, pole 212 drive support crossbar 214 rotation, make the brush 215 on the initial filter screen 211 bottom cleaning, the dust attached to clean down, at the same time, under the action of the transmission belt 217, also will drive pole 221 rotation, make the brush 224 on the fine filter screen 220 bottom cleaning, the dust attached to clean down, finally, after long-term use, workers can through the hand pull plate 208 will collect frame 206 out, empty the dust in it, ensure that the device long-term stable use, avoid pipe blockage, ensure the long-term stable operation of the whole waste heat recovery system.

[0029] The waste heat recovery automatic control mechanism 4 comprises a recovery box 401 fixedly connected to the output end of the air conveying pipe 3, a PLC controller 402 fixedly connected to the front right side of the recovery box 401, a water pipe 403 fixedly connected to the bottom of the front end of the recovery box 401, a hand valve 404 fixedly sleeved to the outside of the water pipe 403, an air pump 412 fixedly connected to the bottom right side of the recovery box 401, a water supplement pipe 405 fixedly connected to the top left side center of the recovery box 401, an electric control valve 406 fixedly sleeved to the outside of the water supplement pipe 405, a water pump 407 fixedly connected to the top center of the recovery box 401, a water conveying pipe 408 fixedly connected to the output end top of the water pump 407, a heat exchange pipe 409 fixedly connected in the recovery box 401, a liquid level sensor 410 fixedly connected to the bottom left side in the recovery box 401, a thermometer one 411 fixedly connected to the bottom right side in the recovery box 401, the input end of the heat exchange pipe 409 is fixedly connected with the output end of the air conveying pipe 3, the output end of the heat exchange pipe 409 is fixedly connected with the input end of the air pump 412, the liquid level sensor 410, the thermometer one 411 and the electric control valve 406 are electrically connected with the PLC controller 402, the output end of the water conveying pipe 408 is communicated with the inside of the auxiliary water tank 5, and the thermometer two 503 is electrically connected with the PLC controller 402 and the temperature table 501 respectively, after the flue gas is filtered, the flue gas enters the heat exchange pipe 409 arranged in the recovery box 401 through the air conveying pipe 3, at this time, the PLC controller 402 arranged is controlled to open the electric control valve 406, the water supplement pipe 405 is communicated, cold water is poured into the recovery box 401, after the cold water is poured full, the liquid level sensor 410 transmits a signal to the PLC controller 402, the PLC controller 402 controls the electric control valve 406 to be closed, the entering cold water absorbs the heat of the heat exchange pipe 409, and the temperature of the water is monitored through the thermometer one 411, when the water in the recovery box 401 is heated and boiled, the PLC controller 402 receives data transmitted back by the thermometer one 411, the PLC controller 402 controls the water pump 417 to be opened, the hot water is sent into the inside of the auxiliary water tank 5 through the water conveying pipe 408 to be heat preserved, then the PLC controller 402 controls the electric control valve 406 to be opened again, new cold water is poured into the recovery box 401, heating is continuously carried out, heat waste is avoided, the conveying and supplement of cold and hot water can be automatically controlled, storage and heat preservation can be automatically carried out, and workers are conveniently used.

[0030] The specific operation mode of the utility model is as follows:

[0031] Firstly, the flue gas enters into the initial filter box 201 through the air inlet pipe 1, and due to the principle that the flue gas itself will float upwards, the flue gas will pass through the bottom of the initial filter screen 211, at this time, the initial filter screen 211 can preliminarily filter the flue gas, filter some larger dust and drop into the collecting frame 206 arranged at the bottom of the initial filter box 201, the flue gas filtered through the initial filter screen 211 enters into the fine filter box 218 through the connecting pipe 227, and then is fine filtered through the fine filter screen 220, and smaller dust is also filtered and dropped into the collecting frame 206 arranged at the bottom of the fine filter box 218, and then is discharged through the air conveying pipe 3, in the process of filtering the flue gas, the driving motor 203 is started to drive the rotating rod 212 to rotate, the rotating rod 212 drives the supporting horizontal rod 214 to rotate, the brush 215 sweeps the bottom of the initial filter screen 211 to sweep the adhered dust, at the same time, the rotating rod 222 is also driven to rotate under the action of the conveying belt 217, the brush 224 sweeps the bottom of the fine filter screen 220 to sweep the adhered dust, finally, after long-term use, the worker can pull out the collecting frame 206 through the hand pulling plate 208 to empty the dust therein, so that the device can be used stably for a long time, the pipeline is prevented from being blocked, and the long-term stable operation of the whole waste heat recovery system is ensured, after the flue gas is filtered, the flue gas enters into the heat exchange pipe 409 arranged in the recovery box 401, at this time, the PLC controller 402 controls the electric control valve 406 to be opened, the water supplement pipe 405 is communicated, cold water is poured into the recovery box 401, after the cold water is poured full, the liquid level sensor 410 transmits a signal to the PLC controller 402, the PLC controller 402 controls the electric control valve 406 to be closed, the entering cold water absorbs the heat of the heat exchange pipe 409, and the water temperature is monitored through the thermometer 411, when the water in the recovery box 401 boils after being heated, the PLC controller 402 receives the data transmitted back by the thermometer 411, the PLC controller 402 controls the water pump 417 to be opened, the hot water is sent into the auxiliary water tank 5 through the water conveying pipe 408 to be heat preserved, then the PLC controller 402 controls the electric control valve 406 to be opened again, new cold water is poured into the recovery box 401, heating is continuously performed, heat waste is avoided, the cold and hot water can be automatically controlled and supplemented, can be automatically stored and heat preserved, and workers are facilitated.

[0032] The utility model is described above in conjunction with the drawings, and obviously, the specific implementation of the utility model is not limited by the above method, as long as the method concept and technical scheme of the utility model are adopted for non-essential improvement or the concept and technical scheme of the utility model are directly applied to other occasions without improvement, which is within the protection scope of the utility model.

Claims

1. A combined heat and power flue gas waste heat recovery device comprising an inlet pipe (1), characterized in that: The air inlet pipe (1) output end is equipped with combined filtering mechanism (2), the combined filtering mechanism (2) top rear end is equipped with air pipe (3), the air pipe (3) output end is equipped with waste heat recovery automatic control mechanism (4), the waste heat recovery automatic control mechanism (4) right side is equipped with auxiliary water tank (5), the auxiliary water tank (5) front end is fixedly connected with temperature table (501), the auxiliary water tank (5) inner wall is fixedly connected with heat preservation layer (502), the auxiliary water tank (5) inside bottom end right side is fixedly connected with thermometer two (503).

2. A combined heat and power flue gas waste heat recovery device according to claim 1, characterised in that: The combined filtering mechanism (2) includes the filter box (201) fixedly connected to the output end of the air inlet pipe (1), the support (202) is fixedly connected to the top of the filter box (201), the drive motor (203) is fixedly connected to the bottom of the horizontal part of the support (202), the rotating rod one (212) is fixedly connected to the bottom of the output end of the drive motor (203), the sleeve one (216) is fixedly sleeved on the outer side of the rotating rod one (212), the support plate one (210) is fixedly connected to the left side of the top of the filter box (201), the filter screen (211) is fixedly connected to the right side of the bottom of the support plate one (210), the mounting sleeve one (213) is fixedly sleeved on the outer side of the rotating rod one (212) penetrating the filter screen (211), the supporting cross rod one (214) is fixedly connected to the bottom of the left and right sides of the mounting sleeve one (213), the brush one (215) is fixedly connected to the top of the supporting cross rod one (214), the communication pipe (227) is fixedly connected to the rear end of the top of the filter box (201), the fine filter box (218) is fixedly connected to the output end of the communication pipe (227), the rotating rod two (221) is arranged on the top of the fine filter box (218), the sleeve two (225) is fixedly sleeved on the outer side of the rotating rod two (221), the support plate two (219) is fixedly connected to the left side of the top of the fine filter box (218), the fine filter screen (220) is fixedly connected to the right side of the bottom of the support plate two (219), the mounting sleeve two (222) is fixedly sleeved on the outer side of the rotating rod two (221) penetrating the fine filter screen (220), the supporting cross rod two (223) is fixedly connected to the bottom of the left and right sides of the mounting sleeve two (222), the brush two (224) is fixedly connected to the top of the supporting cross rod two (223), the collecting box (226) is fixedly connected to the bottom of the filter box (201) and the fine filter box (218), the slot (204) is formed in the front end of the collecting box (226), the sliding groove (205) is formed in the inner wall of the left and right sides of the slot (204), the collecting frame (206) is arranged in the slot (204), the baffle (207) is fixedly connected to the front end of the collecting frame (206), the hand pulling plate (208) is fixedly connected to the front end center of the baffle (207), the sliding rod (209) is fixedly connected to the left and right sides of the collecting frame (206).

3. The heat recovery steam generator of claim 2, wherein: The top of the first brush (215) is attached to the bottom of the primary filter screen (211), the top of the second brush (224) is attached to the bottom of the fine filter screen (220), the rotating rod one (212) is rotatably connected with the primary filter box (201) and the primary filter screen (211), the rotating rod two (221) is rotatably connected with the fine filter box (218) and the fine filter screen (220), and the sleeve one (216) and the sleeve two (225) are drivingly connected through the transmission belt (217).

4. A combined heat and power flue gas waste heat recovery device according to claim 2, characterised in that: The collecting frame (206) is slidingly connected with the sliding groove (205) on the inner wall of the slot (204) through the sliding rod (209) on the left and right sides, the air conveying pipe (3) is fixedly connected to the top rear end of the fine filter box (218), and the top of the two collecting frames (206) is respectively connected with the bottom of the primary filter box (201) and the fine filter box (218).

5. The device according to claim 1, characterized in that: The waste heat recovery automatic control mechanism (4) comprises a recovery box (401) fixedly connected to the output end of the air conveying pipe (3), a PLC controller (402) fixedly connected to the front right side of the recovery box (401), a water pipe (403) fixedly connected to the front bottom of the recovery box (401), a hand valve (404) fixedly sleeved on the outside of the water pipe (403), an air pump (412) fixedly connected to the bottom right side of the recovery box (401), a water supplement pipe (405) fixedly connected to the top left center of the recovery box (401), an electric control valve (406) fixedly sleeved on the outside of the water supplement pipe (405), a water pump (407) fixedly connected to the top center of the recovery box (401), a water conveying pipe (408) fixedly connected to the output end of the water pump (407), a heat exchange pipe (409) fixedly connected in the recovery box (401), a liquid level sensor (410) fixedly connected to the bottom left side in the recovery box (401), and a thermometer one (411) fixedly connected to the bottom right side in the recovery box (401).

6. A combined heat and power flue gas waste heat recovery device according to claim 5, characterised in that: The input end of the heat exchange pipe (409) is fixedly connected with the output end of the air conveying pipe (3), the output end of the heat exchange pipe (409) is fixedly connected with the input end of the air pump (412), and the liquid level sensor (410), the thermometer one (411) and the electric control valve (406) are electrically connected with the PLC controller (402).

7. A combined heat and power flue gas waste heat recovery device according to claim 5, characterised in that: The output end of the water conveying pipe (408) is connected with the inside of the auxiliary water tank (5), and the thermometer two (503) is electrically connected with the PLC controller (402) and the temperature table (501).

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