Energy-saving flue gas cooling device for boiler

Abstract

The present invention discloses an energy-saving flue gas cooling device for a boiler, comprising a main body ring, the main body ring is fixedly connected to the inner wall of a chimney, a cooling mechanism is arranged in the main body ring; the cooling mechanism comprises two cavities opened in the main body ring, a pump plate is sealed and slidably connected in the cavity, the main body ring penetrates a heat-conducting rod which is sealed and slidably connected, the cavity is filled with a circulating liquid, the chimney side wall is fixedly connected to two cooling boxes, the main body ring and the cooling box side wall are penetrated and fixedly connected to two inlet pipes and return pipes, the inlet pipe and the return pipe connect the cooling box with the corresponding cavity, the main body ring is provided with an annular groove, the annular groove is connected to the cavity, and a rotating ring is rotatably connected in the annular groove through a bearing. The advantage is that the present invention cools itself by the waste heat of flue gas, ensures the discharge temperature, avoids environmental pollution, and does not require external energy supply, which is more energy-saving.

Description

Technical Field

[0001] The invention relates to the technical field of boilers, and in particular to an energy-saving flue gas cooling device for a boiler. Background Art

[0002] Boiler is a common equipment for us. It is an energy conversion device. The energy input to the boiler includes chemical energy and electrical energy in the fuel. The boiler outputs steam, high-temperature water or organic heat carrier with certain thermal energy. The hot water or steam generated in the boiler can directly provide the required thermal energy for industrial production and people's life, or it can be converted into mechanical energy through a steam power device, or the mechanical energy can be converted into electrical energy through a generator. Among them, coal is a kind of boiler fuel. During the use of the boiler, due to the combustion of coal, a certain amount of flue gas will be generated, and the flue gas will be directly discharged into the atmosphere through the exhaust pipe and chimney. The discharged flue gas needs to be cooled before it can be discharged to meet the national flue gas emission temperature standards.

[0003] In the prior art, the existing method is to use the waste heat of flue gas for heating water or other substances, thereby utilizing the waste heat, but the temperature of the flue gas discharged can still reach between 70-90°C, which does not meet the emission standards. The higher temperature flue gas will cause environmental pollution, form haze, etc., and additional cooling devices are set up for cooling, which requires additional energy for cooling, resulting in energy waste. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose an energy-saving flue gas cooling device for a boiler.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An energy-saving flue gas cooling device for a boiler comprises a main body ring, the main body ring is fixedly connected to the inner wall of a chimney, and a cooling mechanism is arranged inside the main body ring;

[0007] The cooling mechanism includes two cavities opened in the main body ring, a pump plate is sealed and slidably connected in the cavity, the main body ring penetrates the sealing and slidably connected upper heat conducting rod, the cavity is filled with circulating fluid, the side wall of the chimney is fixedly connected to two cooling boxes, the main body ring and the side wall of the cooling box are jointly penetrated and fixedly connected with two inlet pipes and return pipes, the inlet pipe and the return pipe connect the cooling box with the corresponding cavity, the main body ring is opened with an annular groove, the annular groove is connected with the cavity, a rotating ring is rotatably connected in the annular groove through a bearing, a plurality of conductive rods are fixedly connected to the upper surface of the rotating ring, a plurality of magnetic tiles are fixedly connected to the inner side wall of the annular groove, a plurality of refrigeration plates are fixedly embedded in the inner side wall of the main body ring, a battery is arranged in the main body ring, the battery, the refrigeration plate and the conductive rod are electrically connected through a wire, a plurality of fins are fixedly connected to the side wall of the rotating ring located on one side of the annular groove, hydraulic oil is filled between the inner side wall of the annular groove and the rotating ring, and the main body ring is provided with a heat conducting mechanism for alternately heating the circulating fluids in the two cavities.

[0008] Furthermore, the cooling mechanism also includes a plurality of hollow scrapers, the hollow scrapers are filled with absorbent sponges, and two opposite side walls of the scrapers are each provided with a plurality of capillaries.

[0009] Furthermore, the cooling mechanism also includes two trigger switches, the trigger switches are fixedly connected to the corresponding top walls of the cavities, solenoid valves are provided in the inlet pipe and the return pipe, and the trigger switches are electrically connected to the solenoid valves through wires.

[0010] Furthermore, a retaining ring is arranged in the cavity, and a plurality of heat dissipation plates are penetrated and fixedly connected to the side wall of the cooling box.

[0011] Furthermore, the heat-conducting mechanism includes a heat-conducting ring, which is fixedly connected to the inner wall of the chimney, and a plurality of heat-conducting plates are fixedly connected to the inner wall of the heat-conducting ring. The heat-conducting ring and the main body ring are jointly penetrated and slidably connected with two lower heat-conducting rods, and a plurality of first springs are fixedly connected between the lower heat-conducting rods and the main body ring, and a plurality of second springs are fixedly connected between the upper heat-conducting rod and the bottom wall of the cavity. Two sliding grooves are provided in the main body ring, and the upper heat-conducting rod and the lower heat-conducting rod both extend through and into the corresponding sliding grooves and abut against each other in the sliding grooves.

[0012] Furthermore, the heat-conducting mechanism also includes two electromagnets, which are arranged in the main body ring. The electromagnets are electrically connected to the trigger switch through a wire. A magnetic block and an insulating block are slidably connected in the sliding groove. The magnetic block is fixedly connected to the insulating block, and a third spring is fixedly connected between the magnetic block and the inner wall of the sliding groove.

[0013] Furthermore, the circulating liquid is ethyl acetate.

[0014] The present invention has the following advantages:

[0015] 1. The circulating liquid is heated by the waste heat of the flue gas to gasify it, so that the pressure in the cavity increases. The two pump plates are reciprocated by the alternating heating of the two cavities. The reciprocating motion of the two pump plates causes the hydraulic oil to impact the fins and drive the rotating ring to reciprocate, so that the conductive rod cuts the magnetic flux lines of the magnetic tile, generating electricity to supply the refrigeration plate to cool the flue gas. The circulating liquid is gasified for a primary cooling, and the refrigeration plate is used for a secondary cooling, so that the flue gas temperature is greatly reduced to avoid excessively high temperature emissions and pollution of the environment;

[0016] 2. The waste heat of flue gas and circulating fluid drive the rotating ring to generate electricity, which is then supplied to the refrigeration plate for cooling. At the same time, the excess electricity is stored in the battery, so that the device can cool the flue gas without an external power supply, making the device more energy-efficient;

[0017] 3. When the rotating ring rotates, it drives the scraper to rotate, continuously scraping the surface of the refrigeration plate, thereby scraping off the condensed water and absorbing it into the water-absorbing sponge through the capillaries, thereby preventing the condensed water from adhering to the surface of the refrigeration plate for a long time and corroding its surface, thus ensuring the service life of the refrigeration plate;

[0018] 4. The temperature of flue gas emissions determines the vaporization rate of the circulating liquid, and the vaporization rate determines the rotation speed of the rotating ring, that is, the speed at which the conductive rod cuts the magnetic flux lines of the magnetic tile, thereby determining the size of the generated current, and further determining the cooling efficiency of the refrigeration plate, so that the device can automatically adjust the cooling efficiency according to the flue gas temperature, making the device more automated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of an energy-saving flue gas cooling device for a boiler proposed by the present invention;

[0020] Figure 2 for Figure 1 A in the enlarged view;

[0021] Figure 3 for Figure 1 The enlarged view of point B in the figure;

[0022] Figure 4 for Figure 1 Cross-sectional view at CC in ;

[0023] Figure 5 for Figure 4 The enlarged view of point E in the figure;

[0024] Figure 6 for Figure 1 The cross-sectional view at DD in ;

[0025] Figure 7 This is a schematic diagram of the circuit connection between the cooling plate and the battery in the energy-saving flue gas cooling device for a boiler proposed by the present invention.

[0026] In the figure: 1 main body ring, 101 chimney, 2 cavity, 3 pump plate, 4 circulating fluid, 5 upper heat conducting rod, 6 cooling box, 7 inlet pipe, 8 baffle ring, 9 annular groove, 10 rotating ring, 11 magnetic tile, 12 conductive rod, 13 cooling sheet, 14 battery, 15 scraper, 16 water-absorbing sponge, 17 capillary pores, 18 fins, 19 return pipe, 20 solenoid valve, 21 trigger switch, 22 heat sink, 23 heat conducting ring, 24 heat conducting plate, 25 lower heat conducting rod, 26 first spring, 27 second spring, 28 sliding groove, 29 magnetic block, 30 insulation block, 31 third spring, 32 electromagnet. DETAILED DESCRIPTION

[0027] Reference Figure 1-7 , an energy-saving flue gas cooling device for a boiler, comprising a main body ring 1, the main body ring 1 is fixedly connected to the inner wall of a chimney 101, and a cooling mechanism is arranged in the main body ring 1;

[0028] The cooling mechanism includes two cavities 2 opened in the main body ring 1, and a pump plate 3 is sealed and slidably connected in the cavity 2. The main body ring 1 penetrates and is sealed and slidably connected to a heat conducting rod 5. The cavity 2 is filled with a circulating liquid 4. The circulating liquid 4 is ethyl acetate. Ethyl acetate has a boiling point of 76.5-77.5°C. It can boil and vaporize when the flue gas temperature reaches this temperature. The side wall of the chimney 101 is fixedly connected to two cooling boxes 6. The cooling box 6 is made of aluminum alloy, which is light in texture, high in strength, and has good thermal conductivity, so that the vaporized circulating liquid 4 can be condensed when it enters the interior. The main body ring 1 and the side wall of the cooling box 6 are penetrated and fixedly connected to two inlet pipes 7 and a return pipe 19. Both the inlet pipe 7 and the return pipe 19 are provided with a one-way valve. The one-way valve in the inlet pipe 7 only allows gas and liquid to enter the cooling box 6 from the cavity 2, and the one-way valve in the return pipe 19 only allows liquid to enter the cavity 2 from the cooling box 6. In the cooling box 6, the inlet pipe 7 and the return pipe 19 connect the cooling box 6 with the corresponding cavity 2. The main ring 1 is provided with an annular groove 9, which is connected with the cavity 2. A rotating ring 10 is rotatably connected in the annular groove 9 through a bearing. The bearing between the rotating ring 10 and the annular groove 9 is a sealed bearing to avoid leakage of internal hydraulic oil and ensure sealing. A plurality of conductive rods 12 are fixedly connected to the upper surface of the rotating ring 10, and a plurality of magnetic tiles 11 are fixedly connected to the inner wall of the annular groove 9. The magnetic flux lines of the magnetic tiles 11 point to the center of the cross section of the main ring 1, so that the conductive rods 12 can continuously cut the magnetic flux lines of the magnetic tiles 11 during the rotation of the rotating ring 10 to generate electrical energy. A plurality of refrigeration plates 13 are fixedly embedded in the inner wall of the main ring 1. The refrigeration plates 13 can be energized for refrigeration. This is a prior art. A battery 14 is arranged in the main ring 1. The battery 14, the refrigeration plates 13 and the conductive rods 12 are electrically connected through wires, such as Figure 7As shown, the battery 14 and the cooling plate 13 are respectively connected in series with a diode and then connected in parallel, and the two diodes allow the passage direction to be opposite, and then connected in series with the conductive rod 12, so that during the reciprocating rotation of the conductive rod 12, the forward rotation can energize the cooling plate 13 for cooling, and the reverse rotation can supply electric energy to the battery 14. The side wall of the rotating ring 10 located on one side of the annular groove 9 is fixedly connected with a plurality of fins 18, as shown in FIG. Figure 4 As shown, the fin 18 is inclined to one side, and when the hydraulic oil flows, it can drive the rotating ring 10 to rotate under the impact of the hydraulic oil. The inner wall of the annular groove 9 and the rotating ring 10 are filled with hydraulic oil. The main ring 1 is provided with a heat conduction mechanism that alternately heats the circulating fluid 4 in the two cavities 2. The circulating fluid 4 in the two cavities 2 is heated by the heat conduction mechanism and the residual heat of the flue gas. When the circulating fluid 4 in the left cavity 2 is heated, the circulating fluid 4 is continuously gasified with continuous heating. At this time, the solenoid valves 20 on the left are all in a closed state, and the air pressure in the left cavity 2 is continuously increased, so that the left pump plate 3 slides up, pumps the hydraulic oil into the annular groove 9, and pumps the hydraulic oil in the annular groove 9 into the cavity 2 on the right, so that the pump plate 3 on the right slides down, pumps the gaseous circulating fluid 4 into the cooling box 6 for cooling and liquefaction, and at the same time pumps the liquefied circulating fluid 4 into the cavity 2 on the right. The flow of hydraulic oil impacts the fin 18, so that the rotating ring 10 rotates, thereby driving the conductive rod 1 2 cuts the magnetic flux lines of the magnetic tile 11, generates electric energy to supply the cooling plate 13, and cools the flue gas until the left pump plate 3 contacts the left trigger switch 21, so that the left solenoid valve 20 is opened and the right solenoid valve 20 is closed, and the circulating liquid 4 in the right cavity 2 is heated at the same time, and the right pump plate 3 slides up to drive the rotating ring 10 to reverse, and at the same time, the gasified circulating liquid 4 on the left enters the cooling box 6 for condensation, and the circulating liquid 4 in the left cavity 2 is replenished, and the rotating ring 10 reverses to drive the conductive rod 12 to reverse, and charge the battery 14. The accumulated electricity in the battery 14 can be used to continue to keep the flue gas cool when the device fails, and ensure that the flue gas can still be cooled during maintenance, so that the circulating liquid 4 is gasified for a cooling once, and then the cooling of the cooling plate 13 is used for a second cooling, so that the flue gas temperature is greatly reduced, avoiding excessive temperature emissions to pollute the environment, and at the same time, no external energy is required, and the flue gas itself is used for cooling. The waste heat is used for cooling, which is more energy-saving.

[0029] It is worth mentioning that the temperature of the flue gas emission determines the vaporization rate of the circulating liquid 4, and the vaporization rate determines the rotation speed of the rotating ring 10, that is, it determines the speed at which the conductive rod 12 cuts the magnetic flux lines of the magnetic tile 11, thereby determining the magnitude of the generated current, and further determines the cooling efficiency of the refrigeration plate 13, so that the device can automatically adjust the cooling efficiency according to the flue gas temperature, making the device more automated.

[0030] The cooling mechanism also includes a plurality of hollow scrapers 15, which are filled with absorbent sponges 16. The two opposite side walls of the scrapers 15 are provided with a plurality of capillaries 17. When the scrapers 15 rotate with the rotating ring 10, the surface of the refrigeration plate 13 is continuously scraped to scrape off the condensed water on the surface. Since the components in the flue gas are relatively complex, there are many corrosive substances in the condensed water. If the condensed water remains on the surface of the refrigeration plate 13 for a long time, the surface will be overlooked, which greatly affects the service life of the refrigeration plate 13. The condensed water is scraped off by the scrapers 15, and then enters the scrapers 15 through the capillaries 17, and is absorbed by the absorbent sponge 16, and then is slowly discharged with the flue gas, which effectively prevents the condensed water from being attached to the surface of the refrigeration plate 13 for a long time and corroding it, thereby greatly improving the service life of the refrigeration plate 13.

[0031] The cooling mechanism also includes two trigger switches 21. The water discharge level of the trigger switch 21 is IP69 level. It is tightly sealed and can effectively prevent hydraulic oil from entering its interior and affecting its normal operation. The trigger switch 21 is fixedly connected to the top wall of the corresponding cavity 2. The inlet pipe 7 and the return pipe 19 are both provided with solenoid valves 20. The trigger switch 21 and the solenoid valve 20 are electrically connected through a wire. When the trigger switch 21 is pressed once, it can be energized, and when pressed again, the power can be cut off. The solenoid valve 20 located in the left inlet pipe 7 and the return pipe 19 is a normally open solenoid valve, which is closed when energized, while the solenoid valve 20 located in the right inlet pipe 7 and the return pipe 19 is a normally closed solenoid valve, which is opened when energized. That is, during the reciprocating motion of the pump plates 3 on both sides and the alternating contact with the trigger switch 21, the solenoid valves 20 on the left and right sides can be switched alternately.

[0032] A retaining ring 8 is arranged in the cavity 2, and the retaining ring 8 limits the pump plate 3 to a certain extent to prevent it from sliding excessively and crossing the entry pipe 7, causing the hydraulic oil to enter the cooling box 6. A number of heat sinks 22 are fixedly connected to the side wall of the cooling box 6. Through the arrangement of the heat sink 22, the contact area between the circulating fluid 4 and the outside world is increased, so that it can enter the cooling box 6 and be condensed and liquefied faster.

[0033] The heat conduction mechanism includes a heat conduction ring 23, which is fixedly connected to the inner wall of the chimney 101. A plurality of heat conduction plates 24 are fixedly connected to the inner wall of the heat conduction ring 23. The arrangement of the heat conduction plates 24 increases the contact area with the flue gas, so as to better exchange heat with the flue gas. The residual heat of the flue gas is transferred to the heat conduction ring 23 through the heat conduction plates 24, and then to the lower heat conduction rod 25, and finally to the circulating liquid 4 in the cavity 2. The heat conduction ring 23 and the main body ring 1 are slidably connected to two lower heat conduction rods 25. A plurality of first springs 26 are fixedly connected between the lower heat conduction rod 25 and the main body ring 1, and a plurality of second springs 27 are fixedly connected between the upper heat conduction rod 5 and the inner bottom wall of the cavity 2. The cross-sections of the upper heat-conducting rod 5 and the lower heat-conducting rod 25 are both T-shaped, and two sliding grooves 28 are provided in the main body ring 1. The upper heat-conducting rod 5 and the lower heat-conducting rod 25 extend through the corresponding sliding grooves 28 and abut against each other in the sliding grooves 28. The upper heat-conducting rod 5, the lower heat-conducting rod 25, the heat-conducting plate 24, and the heat-conducting ring 23 are all made of aluminum alloy, which has high strength, light texture, and good thermal conductivity. After the upper heat-conducting rod 5 and the lower heat-conducting rod 25 abut against each other, the elastic force of the first spring 26 and the second spring 27 can make the two tightly abut against each other. Through the tightly abutting two, the heat of the heat-conducting ring 23 is transferred to the circulating fluid 4 in the cavity 2, and the circulating fluid 4 is heated.

[0034] The heat conduction mechanism also includes two electromagnets 32, which are arranged in the main body ring 1. The electromagnet 32 ​​is electrically connected to the trigger switch 21 through a wire. The trigger switch 21 can control the on and off of the two electromagnets 32, that is, in the initial state, the left electromagnet 32 ​​is energized and the right electromagnet 32 ​​is de-energized. At this time, pressing the left trigger switch 21 can make the left electromagnet 32 ​​de-energized and the right electromagnet 32 ​​energized. At this time, pressing the right trigger switch 21 can again energize the left electromagnet 32 ​​and the right electromagnet 32. The circuit connection relationship is the existing technology and is not repeated here. A magnetic block 29 and an insulating block 30 are slidably connected in the sliding groove 28. After the electromagnet 32 ​​is energized, a magnetic repulsion force can be generated on the corresponding magnetic block 29. The magnetic block 29 is fixedly connected to the insulating block 30. A third spring 31 is fixedly connected between the magnetic block 29 and the inner wall of the sliding groove 28. The insulating block 30 is an aerogel block with good thermal insulation. Figure 3 The cross-section of one end of the magnetic block 29 is triangular, which is convenient for inserting it between the upper heat-conducting rod 5 and the lower heat-conducting rod 25 and separating them. When the insulation block 30 is inserted between the upper heat-conducting rod 5 and the lower heat-conducting rod 25, the two can be separated and the heat transfer between the two can be blocked.

[0035] In the present invention, in the initial state, the solenoid valve 20 on the left is powered on and closed, and the solenoid valve 20 on the right is powered on and closed. At the same time, the electromagnet 32 ​​on the left is powered off, and the electromagnet 32 ​​on the right is powered on, generating a magnetic repulsion force on the magnetic block 29 on the right, so that the insulation block 30 on the right separates the upper heat-conducting rod 5 on the right from the lower heat-conducting rod 25.

[0036] At this time, the flue gas passes through the heat conductive ring 23 and the heat conductive plate 24, so that the temperature of the flue gas is transmitted to the left cavity 2 through the heat conductive plate 24, the heat conductive ring 23, the upper heat conductive rod 5 and the lower heat conductive rod 25 on the left, so that the temperature of the circulating fluid 4 in the left cavity 2 increases, and the air pressure in the left cavity 2 continues to increase, so that the left pump plate 3 slides up, pumps the hydraulic oil into the annular groove 9, and pumps the hydraulic oil in the annular groove 9 into the cavity 2 on the right, so that the pump plate 3 on the right slides down, and pumps the gaseous circulating fluid 4 into the cooling box 6 for cooling and liquefaction, and at the same time, pumps the liquefied circulating fluid 4 into the cavity 2 on the right, and the flow of hydraulic oil impacts the fin 18, so that the rotating ring 10 rotates, thereby driving the conductive rod 12 to cut the magnetic flux lines of the magnetic tile 11, generating electrical energy to supply the refrigeration plate 13, and cooling the flue gas until the left pump plate 3 contacts the trigger switch 21 on the left.

[0037] At this time, the left solenoid valve 20 is powered off and opened, and the right solenoid valve 20 is powered off and closed. At the same time, the left electromagnet 32 ​​is energized, so that the left magnetic block 29 drives the left insulating block 30 to slide and insert it between the upper heat-conducting rod 5 and the lower heat-conducting rod 25 on the left to separate them, and the right electromagnet 32 ​​is powered off. Under the elastic force of the third spring 31, the right insulating block 30 is reset. At this time, under the elastic force of the first spring 26 and the second spring 27, the upper heat-conducting rod 5 on the right is in contact with the lower heat-conducting rod 25 and heat is conducted. At this time, the temperature of the flue gas heats the circulating liquid 4 in the right cavity 2 to vaporize it. The gasification pressure causes the pump plate 3 on the right to slide up and the right cavity 2 is pumped into the annular groove 9, and the hydraulic oil in the annular groove 9 is pumped into the cavity 2 on the left, so that the pump plate 3 on the left slides down, and the gaseous circulating liquid 4 in the cavity 2 on the left is pumped into the cooling box 6 for cooling and liquefaction, and the liquefied circulating liquid 4 is pumped into the cavity 2 on the left. At this time, the flow of hydraulic oil causes the rotating ring 10 to drive the conductive rod 12 to reverse, and the battery 14 is charged until the pump plate 3 on the right contacts and presses the trigger switch 21 on the right, and then returns to the state consistent with the initial stage. This reciprocating process causes the circulating liquid 4 in the two cavities 2 to be gasified and liquefied, so that the rotating ring 10 rotates back and forth to cool the flue gas.

[0038] When the rotating ring 10 rotates, the scraper 15 rotates therewith, and the scraper 15 scrapes off the condensed water on the refrigeration plate 13, and then allows the condensed water to enter the scraper 15 through the capillary pores 17 and be absorbed by the water-absorbing sponge 16, and then slowly discharged with the flue gas, effectively preventing the condensed water from adhering to the surface of the refrigeration plate 13 for a long time and corroding it, thereby greatly improving the service life of the refrigeration plate 13.

Claims

1. An energy-saving flue gas cooling device for a boiler, comprising a main body ring (1), wherein the main body ring (1) is fixedly connected to the inner wall of a chimney (101), characterized in that: A cooling mechanism is provided inside the main body ring (1); The cooling mechanism comprises two cavities (2) opened in the main body ring (1), a pump plate (3) is sealed and slidably connected in the cavity (2), the main body ring (1) penetrates and seals and slides to connect the upper heat conducting rod (5), the cavity (2) is filled with circulating fluid (4), the side wall of the chimney (101) is fixedly connected to two cooling boxes (6), the main body ring (1) and the side wall of the cooling box (6) are penetrated and fixedly connected to two inlet pipes (7) and return pipes (19), the inlet pipes (7) and return pipes (19) connect the cooling box (6) with the corresponding cavity (2), the main body ring (1) is provided with an annular groove (9), the annular groove (9) is connected to the cavity (2), the annular groove (9) is rotated by a bearing, and the inner wall of the annular groove (9) is provided with a bearing. The main body ring (1) is rotatably connected to a rotating ring (10), a plurality of conductive rods (12) are fixedly connected to the upper surface of the rotating ring (10), a plurality of magnetic tiles (11) are fixedly connected to the inner wall of the annular groove (9), a plurality of cooling fins (13) are fixedly embedded in the inner wall of the main body ring (1), a storage battery (14) is arranged in the main body ring (1), the storage battery (14), the cooling fins (13) and the conductive rods (12) are electrically connected through wires, a plurality of fins (18) are fixedly connected to the side wall of the rotating ring (10) located on one side of the annular groove (9), hydraulic oil is filled between the inner wall of the annular groove (9) and the rotating ring (10), and the main body ring (1) is provided with a heat conduction mechanism for alternately heating the circulating fluid (4) in the two cavities (2).

2. The energy-saving flue gas cooling device for a boiler according to claim 1, characterized in that: The cooling mechanism further comprises a plurality of hollow scrapers (15), wherein the hollow scrapers (15) are filled with water-absorbing sponges (16), and two opposite side walls of the scrapers (15) are each provided with a plurality of capillary holes (17).

3. The energy-saving flue gas cooling device for a boiler according to claim 1, characterized in that: The cooling mechanism further comprises two trigger switches (21), wherein the trigger switches (21) are fixedly connected to the corresponding inner top walls of the cavities (2), and the inlet pipe (7) and the return pipe (19) are both provided with electromagnetic valves (20), and the trigger switches (21) are electrically connected to the electromagnetic valves (20) via wires.

4. The energy-saving flue gas cooling device for a boiler according to claim 1, characterized in that: A retaining ring (8) is arranged in the cavity (2), and a plurality of heat dissipation plates (22) are penetrated and fixedly connected to the side wall of the cooling box (6).

5. The energy-saving flue gas cooling device for a boiler according to claim 1, characterized in that: The heat-conducting mechanism comprises a heat-conducting ring (23), the heat-conducting ring (23) is fixedly connected to the inner wall of the chimney (101), the inner wall of the heat-conducting ring (23) is fixedly connected to a plurality of heat-conducting plates (24), the heat-conducting ring (23) and the main body ring (1) are penetrated together by two lower heat-conducting rods (25) which are slidably connected, a plurality of first springs (26) are fixedly connected between the lower heat-conducting rods (25) and the main body ring (1), a plurality of second springs (27) are fixedly connected between the upper heat-conducting rod (5) and the inner bottom wall of the cavity (2), two sliding grooves (28) are provided in the main body ring (1), the upper heat-conducting rod (5) and the lower heat-conducting rod (25) both penetrate and extend into the corresponding sliding grooves (28), and abut against each other in the sliding grooves (28).

6. The energy-saving flue gas cooling device for a boiler according to claim 5, characterized in that: The heat-conducting mechanism further comprises two electromagnets (32), the electromagnets (32) being arranged in the main body ring (1), the electromagnets (32) being electrically connected to the trigger switch (21) via a wire, a magnetic block (29) and a heat-insulating block (30) being slidably connected in the sliding groove (28), the magnetic block (29) being fixedly connected to the heat-insulating block (30), and a third spring (31) being fixedly connected between the magnetic block (29) and the inner wall of the sliding groove (28).

7. The energy-saving flue gas cooling device for a boiler according to claim 1, characterized in that: The circulating liquid (4) is ethyl acetate.

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