Heat exchange device of smoke exhaust fan

Abstract

The invention belongs to the technical field of heat exchange, and particularly relates to a smoke exhaust fan heat exchange device which comprises a heat exchange energy saver and a connecting pipe communicated with the heat exchange energy saver. A cooling mechanism is arranged at one end of the heat exchange energy saver; the cooling mechanism comprises a connecting frame arranged on one side of the heat exchange energy saver, a communicating pipe connected with the connecting pipe is fixedly installed in the connecting frame, and an air outlet pipe communicating with the communicating pipe is fixedly installed on one face of the connecting frame. Through the designed spraying cooling structure, a large temperature difference is forcibly manufactured and maintained inside and outside the pipe wall by cooling the pipe wall of the communicating pipe serving as an intermediate medium, and the temperature difference drives heat to irreversibly pass through the pipe wall from high-temperature flue gas and finally be taken away by flowing cooling water, so that effective heat exchange of the flue gas is realized, and the heat exchange efficiency of the flue gas is improved. And further heat exchange operation on the flue gas exhausted by the heat exchange energy saver is completed.

Description

Technical Field

[0001] This invention belongs to the field of heat exchange technology, specifically a heat exchange device for a smoke exhaust fan. Background Technology

[0002] Exhaust fans (also known as induced draft fans) are core auxiliary equipment in boiler systems. They are specifically designed for the high-temperature, dusty, and corrosive flue gas generated after boiler combustion. Their core function is to maintain negative pressure in the furnace through forced exhaust, transport flue gas to environmental protection treatment equipment and waste heat recovery devices, and ultimately achieve compliant flue gas emissions and efficient energy utilization.

[0003] The flue gas produced by the boiler first enters the economizer for heat exchange. The economizer works by using the high-temperature flue gas to heat the boiler feedwater, thereby reducing the exhaust gas temperature and recovering waste heat from the flue gas. This directly increases the boiler feedwater temperature, reduces fuel consumption, significantly improves boiler thermal efficiency, and reduces emissions. After passing through the economizer, the flue gas is then discharged into subsequent equipment by an exhaust fan.

[0004] The temperature of the flue gas discharged after the energy-saving device has been operating is generally controlled between 100-200℃. This flue gas temperature is still considered a medium-to-high temperature gas, and it can damage the equipment when it is transported to subsequent equipment (such as filter bags) by the exhaust fan. At the same time, temperatures exceeding 180℃ under high-sulfur flue gas will accelerate the aging of the anti-corrosion layer of the desulfurization tower, resulting in a shortened service life of the equipment and an increased economic burden.

[0005] Therefore, the present invention provides a heat exchange device for a smoke exhaust fan. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a heat exchange device for a smoke exhaust fan, comprising a heat exchanger and a connecting pipe connected to the heat exchanger; a cooling mechanism is provided at one end of the heat exchanger; the cooling mechanism includes a connecting frame provided on one side of the heat exchanger, a connecting pipe connected to the connecting pipe is fixedly installed inside the connecting frame, and an exhaust pipe connected to the connecting pipe is fixedly installed on one side of the connecting frame; a water pump is fixedly installed on the top of the connecting frame, and a water pump pipe and an exhaust pipe connected to the inside are fixedly installed on the water pump, one end of the exhaust pipe is inside the connecting frame, and one end of the water pump pipe is connected to a storage box inside the connecting frame; two symmetrically arranged and inclined guide plates are fixedly installed on the inner top of the storage box, and a slot is provided between the two guide plates.

[0008] Furthermore, a diversion mechanism is provided inside the connecting frame. The diversion mechanism includes a hollow diversion frame that is fixed inside the connecting frame by several fixing rods. One end of the water outlet pipe is connected to the inside of the diversion frame, and several liquid outlet holes connected to the inside are opened at the bottom of the diversion frame.

[0009] Furthermore, an auxiliary mechanism is provided inside the connecting frame. The auxiliary mechanism includes several semi-circular auxiliary frames fixedly installed inside the connecting frame. Each auxiliary frame is located below the connecting pipe and has a liquid outlet pipe that penetrates through it. Two detachable filter screens are installed inside the liquid outlet pipe, and activated carbon is placed between the two filter screens. Several arc-shaped baffles that abut against the connecting pipe are fixedly installed inside the auxiliary frames. One side of each baffle has a through groove that penetrates through it. A rotating plate with a magnetic top is rotatably connected to the through groove via a torsion spring. A first electromagnet is fixedly installed inside the baffle. A filtration mechanism is provided on the baffle. The filtration mechanism includes an inclined sleeve fixedly installed between the baffle and the liquid outlet pipe. A push rod is slidably connected inside the sleeve via a sleeve plate. An elastic rope is fixedly installed between the sleeve plate and the inside of the sleeve. An arc-shaped fixing plate is fixedly installed at one end of the push rod. Several conical rods are fixedly installed on one side of the sleeve plate.

[0010] Furthermore, a dispersing mechanism is provided inside the connecting pipe, the dispersing mechanism including a first fan blade installed inside the connecting pipe.

[0011] Furthermore, several irregularly arranged and arc-shaped diverter plates are fixedly installed inside the connecting pipe, and one side of the diverter plate has several through holes penetrating through itself.

[0012] Furthermore, the connecting pipe and the connecting tube are connected by an adapter mechanism, which includes an adapter tube fixedly connected to the connecting pipe. The adapter tube gradually increases in size from the end closer to the connecting pipe to the end farther away from the connecting pipe, and a rubber collar is fixedly installed on the outer surface of the connecting pipe.

[0013] Furthermore, the storage box is equipped with a stirring mechanism, which includes several support rods fixedly connected to the guide plate. The surface of the support rods is rotatably sleeved with a second fan blade located at the slot, and an arc-shaped stirring plate is fixedly installed at the bottom of the second fan blade.

[0014] Furthermore, several cooling plates are fixedly installed at the bottom of the storage box.

[0015] Furthermore, the storage box is equipped with a discharge mechanism, which includes a fixed tube fixedly installed inside the storage box. A sliding rod with a sealing disc is slidably connected inside the fixed tube, and a spring is fixedly installed between the fixed tube and the sealing disc. A discharge pipe with a one-way valve and communicating with the interior is fixedly installed on one side of the fixed tube, and a feed pipe with a one-way valve and communicating with the interior is fixedly installed on one end of the fixed tube. A second electromagnet is fixedly installed on one end of the sliding rod, and a third electromagnet is provided on the stirring plate.

[0016] Furthermore, a storage box is fixedly installed on one side of the connecting frame, and one end of the feed pipe is connected to the inside of the storage box.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The present invention discloses a heat exchange device for a flue gas fan. Water is pumped from a collection box into a pump via a suction pipe, then directed through an outlet pipe into a distribution frame, filling the distribution frame with water. The water is then sprayed onto the surface of a connecting pipe through outlet holes within the distribution frame. The design of the distribution frame and multiple outlet holes allows for more even spraying of water onto the horizontally designed connecting pipe, achieving heat exchange between the connecting pipe and the high-temperature flue gas inside. Simultaneously, the sprayed water is guided by two arc-shaped guide plates to the slot opening, thus re-entering the collection box and being pumped back into the pump via the suction pipe, completing a reciprocating cycle. Through the above-designed spray cooling structure, a large temperature difference is forcibly created and maintained between the inside and outside of the connecting pipe wall, which serves as the intermediate medium. This temperature difference drives the irreversible heat transfer from the high-temperature flue gas through the pipe wall, ultimately being carried away by the flowing cooling water, thereby achieving effective heat exchange of the flue gas and further completing the heat exchange operation on the flue gas discharged from the heat exchanger. This effectively prevents high-temperature gases from entering subsequent equipment, thus avoiding damage and reduced equipment lifespan. Furthermore, the water used for spraying can be repeatedly reused, achieving both economic and environmental benefits.

[0019] 2. The exhaust fan heat exchange device of this invention, through the design of an adapter pipe and gasket, allows the deformable gasket, along with the adapter pipe, to always be able to seal and fix with connecting pipes of different diameters, thereby allowing flue gas to enter the connecting pipe and preventing flue gas leakage. After the flue gas is drawn into the connecting pipe, it drives the first fan blade to rotate. The first fan blade carries the flue gas into the connecting pipe and into contact with several staggered arc-shaped diverter plates. At this time, some flue gas flows through the through holes of the diverter plate into the next diverter plate and is dispersed again, while another part of the flue gas is guided by the arc-shaped diverter plates to the inner wall of the connecting pipe, allowing this part of the flue gas to exchange heat with the pipe wall. By installing several arc-shaped auxiliary frames, water is stored in the auxiliary frames, thereby achieving the heat exchange function. As more and more water accumulates in the auxiliary frames, the rotating plate in the baffle groove will rotate and open, allowing the water to flow to the outlet pipe for discharge, and finally to the collection box.

[0020] 3. The exhaust fan heat exchange device of this invention, as the sprayed water is continuously guided to the slot by the guide plate, the continuous water flow impacts the second fan blade, thereby driving the second fan blade and the agitator plate to rotate. The rotating second fan blade throws the falling water to all sides, while the rotating agitator plate can assist in agitation inside the collection box, preventing the water at the top of the collection box from being drawn away before it can contact the cooling plate. Installing cooling plates inside the collection box can quickly cool the sprayed water, preventing the water from being heated after continuous recycling and failing to cool down, which would hinder subsequent heat exchange in the connecting pipe. The designed structure achieves auxiliary cooling of the water flow in the collection box, thereby ensuring that the sprayed water can always play a role in heat exchange in the connecting pipe.

[0021] 4. The exhaust fan heat exchange device of this invention, when the rotating agitator moves the third electromagnet away from the second electromagnet, the sliding rod and other components will reset under the action of the spring, thereby squeezing the agent in the fixed tube out through the discharge pipe. The discharged agent will be quickly mixed with the spray water under the action of the rotating agitator, achieving rapid dissolution and mixing. When the agitator moves the sliding rod away from the fixed tube again, the agent will be replenished through the storage tank, thus achieving continuous dosing. The designed structure purifies the spray water, effectively reducing scale, thereby avoiding the situation where scale hinders heat transfer, leading to a sharp decrease in cooling effect and increased energy consumption. Attached Figure Description

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] Figure 1 This is a three-dimensional structural diagram of the heat exchanger energy-saving device in this invention;

[0024] Figure 2 This is a schematic diagram of the connecting frame in this invention;

[0025] Figure 3 This is a schematic diagram of the structure of the storage box in this invention;

[0026] Figure 4 This is a cross-sectional view of the connecting frame in this invention;

[0027] Figure 5 This is a bottom view of the connecting pipe in this invention.

[0028] Figure 6 This is a schematic diagram of the auxiliary frame in this invention;

[0029] Figure 7 This is a cross-sectional view of the auxiliary frame in this invention;

[0030] Figure 8 In this invention Figure 7 A schematic diagram of the structure at point A;

[0031] Figure 9 This is a side view of the cross-sectional structure of the baffle in this invention;

[0032] Figure 10 This is a cross-sectional view of the connecting pipe in this invention;

[0033] Figure 11 This is a cross-sectional view of the storage box in this invention;

[0034] Figure 12 This is a schematic diagram of the structure of the second fan blade in this invention.

[0035] Figure 13 This is a schematic diagram of the structure of the sliding rod in this invention.

[0036] Figure 14 This is a side view of the cross-sectional structure of the fixed tube in this invention.

[0037] In the diagram: 1. Heat exchanger; 2. Connecting pipe;

[0038] 10. Cooling mechanism; 11. Connecting frame; 12. Connecting pipe; 13. Air outlet pipe; 14. Water pump; 15. Water pumping pipe; 16. Water outlet pipe; 17. Storage box; 18. Guide plate; 19. Groove;

[0039] 20. Diverting mechanism; 21. Fixing rod; 22. Diverting frame; 23. Liquid outlet;

[0040] 30. Auxiliary mechanism; 31. Auxiliary frame; 32. Liquid outlet pipe; 33. Filter screen; 34. Baffle; 35. Through groove; 36. Rotating plate; 37. First electromagnet;

[0041] 38. Filtering mechanism; 381. Sleeve; 382. Push rod; 383. Fixing plate; 384. Sleeve plate; 385. Elastic rope; 386. Conical rod;

[0042] 40. Dispersion mechanism; 41. First fan blade; 42. Diverter plate;

[0043] 50. Adapter mechanism; 51. Adapter tube; 52. Collar;

[0044] 60. Agitating mechanism; 61. Support rod; 62. Second fan blade; 63. Agitating plate;

[0045] 70. Cooling element;

[0046] 80. Discharge mechanism; 81. Fixed pipe; 82. Sliding rod; 83. Sealing disc; 84. Spring; 85. Discharge pipe; 86. Feed pipe; 87. Second electromagnet; 88. Third electromagnet;

[0047] 90. Storage bin. Detailed Implementation

[0048] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0049] like Figures 1 to 12 As shown in the embodiment of the present invention, a heat exchange device for a smoke exhaust fan includes a heat exchanger 1 and a connecting pipe 2 connected to the heat exchanger 1. A cooling mechanism 10 is provided at one end of the heat exchanger 1. The cooling mechanism 10 includes a connecting frame 11 provided on one side of the heat exchanger 1. A connecting pipe 12 connected to the connecting pipe 2 is fixedly installed inside the connecting frame 11. An exhaust pipe 13 connected to the connecting pipe 12 is fixedly installed on one side of the connecting frame 11. A water pump 14 is fixedly installed on the top of the connecting frame 11. A water pump 15 and an exhaust pipe 16 connected to the inside are fixedly installed on the water pump 14. One end of the exhaust pipe 16 is inside the connecting frame 11. One end of the water pump 15 is connected to a storage box 17 inside the connecting frame 11. Two symmetrically arranged and inclined guide plates 18 are fixedly installed on the top of the storage box 17. A slot 19 is provided between the two guide plates 18.

[0050] Specifically, a diversion mechanism 20 is provided inside the connecting frame 11. The diversion mechanism 20 includes a hollow diversion frame 22 that is fixed inside the connecting frame 11 by several fixing rods 21. One end of the water outlet pipe 16 is connected to the inside of the diversion frame 22, and several liquid outlet holes 23 connected to the inside are opened at the bottom of the diversion frame 22.

[0051] During operation, after the heat exchanger 1 is installed with the boiler, the connecting frame 11 is first installed to the heat exchanger 1 via the connecting pipe 12. One end of the connecting frame 11 is connected to the induced draft fan (which extracts flue gas) via the exhaust pipe 13. The flue gas generated by the boiler will enter the connecting pipe 12 of the connecting frame 11 through the heat exchanger 1 and the connecting pipe 2. It should be noted that the flue gas entering the connecting pipe 12 is still 100-200℃.

[0052] By activating the water pump 14 on the connecting frame 11, water (pre-stored) in the storage box 17 is pumped into the pump 14 via the pump pipe 15, and then introduced into the diversion frame 22 through the outlet pipe 16, filling the diversion frame 22 with water. The water is then sprayed onto the surface of the connecting pipe 12 through the outlet holes 23 within the diversion frame 22 (the amount of water pumped by the pump 14 can be controlled according to actual conditions). The diversion frame 22 and several outlet holes 23 are designed to spray water more evenly onto the horizontally designed connecting pipe 12, achieving heat exchange between the connecting pipe 12 and the high-temperature flue gas inside. Simultaneously, the sprayed water is guided by two arc-shaped guide plates 18 to the slot 19, thus re-entering the storage box 17, and then pumped back into the pump 14 by the pump pipe 15, completing a continuous cycle. If the sprayed water in the storage box 17 decreases after subsequent use, water can be added through the inlet pipe.

[0053] The spray cooling structure designed above creates and maintains a large temperature difference between the inside and outside of the pipe wall by cooling the connecting pipe 12, which serves as the intermediate medium. This temperature difference drives the irreversible transfer of heat from the high-temperature flue gas through the pipe wall, ultimately being carried away by the flowing cooling water. This achieves effective heat exchange for the flue gas, further facilitating heat exchange of the flue gas discharged from the heat exchanger 1. This effectively prevents high-temperature gas from damaging subsequent equipment and reducing its lifespan. Furthermore, the water used for spraying can be repeatedly reused, achieving both economic and environmental benefits.

[0054] An auxiliary mechanism 30 is provided inside the connecting frame 11. The auxiliary mechanism 30 includes several semi-circular auxiliary frames 31 fixedly installed inside the connecting frame 11. The auxiliary frames 31 are located below the connecting pipe 12 and have a liquid outlet pipe 32 that passes through them. Two removable filter screens 33 are installed inside the liquid outlet pipe 32, and activated carbon is placed between the two filter screens 33. Several arc-shaped baffles 34 that abut against the connecting pipe 12 are fixedly installed inside the auxiliary frames 31. One side of the baffle 34 has a through groove 35 that passes through it. The through groove 35 is rotatably connected to a rotating plate 36 with a magnetic top by a torsion spring. A first electromagnet 37 is fixedly installed inside the baffle 34; a filter mechanism 38 is provided on the baffle 34, the filter mechanism 38 includes a sleeve 381 fixedly installed between the baffle 34 and the outlet pipe 32 and in an inclined shape, a push rod 382 is slidably connected inside the sleeve 381 through a sleeve plate 384, an elastic rope 385 is fixedly installed between the sleeve plate 384 and the inside of the sleeve 381, an arc-shaped fixing plate 383 is fixedly installed at one end of the push rod 382, ​​and a plurality of cone rods 386 are fixedly installed on one side of the sleeve plate 384. A dispersing mechanism 40 is provided inside the connecting pipe 12, the dispersing mechanism 40 includes a first fan blade 41 installed inside the connecting pipe 12.

[0055] Specifically, several irregularly arranged, arc-shaped diverter plates 42 are fixedly installed inside the connecting pipe 12, and one side of each diverter plate 42 has several through holes. The connecting pipe 12 and the connecting pipe 2 are connected by an adapter mechanism 50. The adapter mechanism 50 includes an adapter tube 51 fixedly connected to the connecting pipe 12. The adapter tube 51 gradually increases in size from the end closer to the connecting pipe 12 to the end farther away from the connecting pipe 12, and a rubber collar 52 is fixedly installed on the outer surface of the connecting pipe 12.

[0056] During operation, the design of the adapter tube 51 and gasket ensures that the deformable gasket, along with the adapter tube 51, can always seal and fix with connecting pipes 2 of different diameters, allowing flue gas to enter the connecting pipe 12 and preventing leakage. After the flue gas is drawn into the connecting pipe 12, it drives the first blade 41 to rotate. The first blade 41 carries the flue gas into the connecting pipe 12, where it comes into contact with several staggered arc-shaped diverter plates 42. At this point, some flue gas flows through the through-holes of the diverter plate 42 into the next diverter plate 42 and is dispersed again, while another portion of the flue gas is guided by the arc-shaped diverter plates 42 to the inner wall of the connecting pipe 12, allowing this portion of the flue gas to exchange heat with the pipe wall. Subsequent flue gas will continuously repeat the above operation, thus achieving rapid heat exchange.

[0057] Since the top surface of the connecting pipe 12 is in contact with the water at the spray point for rapid and effective heat exchange, while the bottom surface is difficult to contact the sprayed water for heat exchange quickly, several arc-shaped auxiliary frames 31 are installed. These frames store water, creating a stable low-temperature zone that forms a significant temperature difference with the bottom of the high-temperature connecting pipe 2. Through radiative heat exchange (the connecting pipe 2 radiates heat to the low-temperature water) and natural convection of the air layer (the connecting pipe 2 heats the air in the gap, and the hot air exchanges heat with the cold water), heat is continuously carried away from the connecting pipe 2, thus achieving auxiliary heat exchange for the flue gas inside the connecting pipe 2. Simultaneously, the intermittent design of the auxiliary frames 31 prevents stress concentration caused by the thermal expansion and contraction of the connecting pipe 2 due to the high-temperature flue gas, preventing pipe deformation and weld cracking. Furthermore, the dispersion mechanism 40 disperses the flue gas inside the connecting pipe 2, and the auxiliary frames 31 work together to assist in heat exchange at the bottom of the connecting pipe 2, eliminating circumferential temperature differences and preventing deformation of the connecting pipe 2 caused by localized high temperatures. As the water level in the auxiliary frame 31 increases, the first electromagnet 37 is de-energized, and it will no longer be fixed to the magnetic material on the top of the rotating plate 36. At this time, the force of the torsion spring of the rotating plate 36 is less than the water pressure, so the rotating plate 36 in the channel 35 will rotate and open, allowing the water in the auxiliary frame 31 to flow into the outlet pipe 32 for discharge, and finally flow to the storage box 17.

[0058] It is important to note that the spray water will absorb trace amounts of acidic substances from the leaked flue gas in the connection box 11, and will also carry oxide powder from the outer wall of the connection pipe 2 and mineral impurities from the spray water itself. These contaminants will accelerate the corrosion of the connection pipe 2 and the auxiliary filter 31, clogging the drain outlet and spray head. The filter screen 33 installed at the outlet pipe 32 is to slow down the water flow, allowing the water flowing through the outlet pipe 32 to have as much contact with the activated carbon as possible for filtration, ensuring long-term stable operation of the system. Simultaneously, the rotating plate 36, when rotating, will squeeze the push rod 382, ​​causing the push rod 382, ​​along with the fixed plate 383, sleeve plate 384, and elastic rope 385, to move into the outlet pipe 32. The scraper 383 agitates the activated carbon in the outlet pipe 32. This brief agitation of the incompletely saturated activated carbon breaks up the surface filter cake layer, restoring water permeation channels and exposing unsaturated pores inside, thus improving adsorption efficiency. When the activated carbon is nearing the end of its service life, a cone-shaped rod is used to break the activated carbon, thereby temporarily increasing the end-adsorption efficiency of the activated carbon to cope with sudden increases in pollution load. After the water in the auxiliary frame 31 is drained, the rotating plate 36 will return to its original position under the action of the torsion spring, thereby closing the through groove 35 of the baffle 34 and restarting the water storage operation. The baffle 34 is designed to support the connecting pipe 12 while allowing the sprayed water to enter the auxiliary frame 31, enabling the auxiliary frame 31 to achieve the function of water storage and auxiliary cooling.

[0059] It is important to note that the construction of a highly efficient heat exchange system between the outer wall of connecting pipe 2 and the low-temperature water enhances the heat flux extraction efficiency of the connecting pipe 2 wall through radiation and convection coupling heat exchange, achieving gradient thermal control of the high-temperature medium inside the connecting pipe 2 and effectively suppressing local heat accumulation within the pipe. Simultaneously, the dynamically circulating low-temperature water provides uniform heat conduction to the outer wall of connecting pipe 2, balancing the circumferential temperature field distribution of the pipe, reducing the temperature gradient between the inner and outer walls of connecting pipe 2, mitigating fatigue damage to the pipe structure from thermal stress, and improving the long-term structural reliability of connecting pipe 2. Traditional continuous supports create a rigid constraint along the entire length of the pipe bottom. When the pipe expands and contracts thermally, the deformation is restricted by the supports, causing stress concentration at the constraint points, which can easily lead to pipe bending and weld cracking in the long term. However, the several intermittently placed outlet pipes 32 designed in this application, due to their "discontinuous constraint" characteristics, release the thermal deformation space of the pipe. Furthermore, the thermal stress itself is a "steady-state thermal stress," and its value is controllable.

[0060] The storage box 17 is equipped with a stirring mechanism 60, which includes several support rods 61 fixedly connected to the guide plate 18. A second fan blade 62 located at the slot 19 is rotatably sleeved on the surface of the support rods 61. An arc-shaped stirring plate 63 is fixedly installed at the bottom of the second fan blade 62. Several cooling plates 70 are fixedly installed at the bottom of the storage box 17.

[0061] During operation, as the sprayed water is continuously guided by the guide plate 18 to the slot 19, the continuous water flow impacts the second fan blade 62, causing the second fan blade 62 and the agitator plate 63 to rotate. The rotating second fan blade 62 throws the falling water in all directions, while the rotating agitator plate 63 assists in agitating the water inside the collection box 17, preventing the water at the top of the collection box 17 from being drawn away before it can reach the cooling plate 70. Installing the cooling plate 70 inside the collection box 17 allows for rapid cooling of the sprayed water (the heating side of the cooling plate 70 is outside the connecting frame 11), preventing the water from being heated after continuous recycling and failing to cool down, which would hinder subsequent heat exchange with the connecting pipe 12.

[0062] The structure designed above provides auxiliary cooling for the water flow inside the storage box 17, thereby ensuring that the sprayed water can always play a role in heat exchange with the connecting pipe 12.

[0063] The storage box 17 is equipped with a discharge mechanism 80, which includes a fixed tube 81 fixedly installed inside the storage box 17. A sliding rod 82 with a sealing disc 83 is slidably connected inside the fixed tube 81. A spring 84 is fixedly installed between the fixed tube 81 and the sealing disc 83. A discharge pipe 85 with a one-way valve and communicating with the interior is fixedly installed on one side of the fixed tube 81. A feed pipe 86 with a one-way valve and communicating with the interior is fixedly installed on one end of the fixed tube 81. A second electromagnet 87 is fixedly installed on one end of the sliding rod 82. A third electromagnet 88 is provided on the stirring plate 63. A storage box 90 is fixedly installed on one side of the connecting frame 11. One end of the feed pipe 86 is connected to the interior of the storage box 90.

[0064] During operation, after prolonged circulation, the spray water continuously evaporates and concentrates as it cools the high-temperature connecting pipe 12. Hardness ions such as calcium and magnesium precipitate out, forming hard scale that adheres tightly to the outer wall of the pipe. At this time, the second electromagnet 87 and the third electromagnet 88 are periodically energized. This causes the rotating agitator 63, carrying the third electromagnet 88, to approach the second electromagnet 87. This, in turn, causes the sliding rod 82, sealing disc 83, and spring 84 to slide away from the fixed pipe 81, drawing the agent (which can be a scale inhibitor, powder, or liquid) into the fixed pipe 81 through the feed pipe 86. When the rotating agitator 63 moves away from the second electromagnet 87, the sliding rod 82 and other components return to their original position under the action of the spring 84, thus squeezing the agent out of the fixed pipe 81 through the discharge pipe 85. The discharged agent is then rapidly mixed with the spray water by the rotating agitator 63, achieving rapid dissolution and mixing. When the stirring plate 63 moves away from the fixed pipe 81 again, the agent will be replenished through the storage box 90, thus achieving continuous addition of agent.

[0065] The structure designed above purifies the spray water, effectively reducing scale buildup and preventing scale from hindering heat transfer, which would otherwise lead to a sharp decrease in cooling effect and an increase in energy consumption.

[0066] Working Principle: After the heat exchanger 1 is installed with the boiler, the connecting frame 11 is first installed to the heat exchanger 1 via the connecting pipe 12, and one end of the connecting frame 11 is connected to the induced draft fan via the exhaust pipe 13. The flue gas generated by the boiler enters the connecting pipe 12 of the connecting frame 11 through the heat exchanger 1 and the connecting pipe 2. It should be noted that the flue gas entering the connecting pipe 12 is still 100-200℃. By starting the water pump 14 on the connecting frame 11, water in the collection box 17 is pumped into the water pump 14 via the water pump pipe 15, and then introduced into the distribution frame 22 through the water outlet pipe 16, so that the distribution frame 22 is filled with water, and then sprayed onto the surface of the connecting pipe 12 through the liquid outlet holes 23 in the distribution frame 22. The design of the distribution frame 22 and several liquid outlet holes 23 can spray water more evenly onto the horizontally designed connecting pipe 12, realizing heat exchange between the connecting pipe 12 and the high-temperature flue gas inside. Meanwhile, the sprayed water is guided by two arc-shaped guide plates 18 to the slot 19, thus re-entering the storage box 17, and then pumped into the water pump 14 by the water pipe 15, thereby completing the reciprocating cycle. If the spray water in the storage box 17 decreases after subsequent use, water can be added through the water inlet pipe.

[0067] By designing the adapter tube 51 and gasket, the deformable gasket, along with the adapter tube 51, can always seal and fix with connecting pipes 2 of different diameters, thus allowing flue gas to enter the connecting pipe 12 and preventing flue gas leakage. After the flue gas is drawn into the connecting pipe 12, it drives the first fan blade 41 to rotate. The first fan blade 41 carries the flue gas into the connecting pipe 12, where it comes into contact with several staggered arc-shaped diverter plates 42. At this time, some flue gas flows through the through holes of the diverter plate 42 into the next diverter plate 42 and is dispersed again, while another part of the flue gas is guided by the arc-shaped diverter plates 42 to the inner wall of the connecting pipe 12, allowing this part of the flue gas to exchange heat with the pipe wall. Subsequent flue gas will continuously repeat the above operation, thereby achieving rapid heat exchange. Since the connecting pipe 12 mainly contacts the water at the spray point for rapid and effective heat exchange at the top surface, it is difficult for the bottom surface to quickly contact the sprayed water for heat exchange. Therefore, by installing several arc-shaped auxiliary frames 31, water is stored in the auxiliary frames 31, thereby achieving auxiliary heat exchange for the flue gas in the connecting pipe 2. As the water in the auxiliary frames 31 increases, the first electromagnet 37 is de-energized, and the first electromagnet 37 will not be fixed to the magnetic material on the top of the rotating plate 36. At this time, the force of the torsion spring of the rotating plate 36 is less than the water pressure, so the rotating plate 36 in the through groove 35 will rotate and open, allowing the water in the auxiliary frames 31 to flow into the liquid outlet pipe 32, and finally flow to the storage box 17.

[0068] As the sprayed water is continuously guided by the guide plate 18 to the slot 19, the continuous water flow impacts the second fan blade 62 (the water flows in through the slot 19 formed by the two inclined guide plates 18, continuously impacting the second fan blade 62; since the surface of the second fan blade 62 is not flat but curved, it rotates continuously), thus driving the second fan blade 62 and the agitator plate 63 to rotate. The rotating second fan blade 62 throws the falling water in all directions, while the rotating agitator plate 63 assists in agitating the water inside the collection box 17, preventing the water at the top of the collection box 17 from being drawn away before it can reach the cooling plate 70. Installing the cooling plate 70 inside the collection box 17 can quickly cool the sprayed water, preventing the water from being heated after continuous recycling and failing to cool down, which would hinder subsequent heat exchange in the connecting pipe 12.

[0069] When the spray water is used for a long time, it will continuously evaporate and concentrate when cooling the high-temperature connecting pipe 12. Hardness ions such as calcium and magnesium in the water will precipitate out and form hard scale, which will adhere tightly to the outer wall of the pipe. At this time, the second electromagnet 87 and the third electromagnet 88 (there is only one third electromagnet 88, which is installed on the second blade 62 closest to the second electromagnet 87) are periodically energized. This causes the rotating agitator 63 to bring the third electromagnet 88 closer to the second electromagnet 87, which in turn causes the sliding rod 82, sealing disc 83, and spring 84 to slide away from the fixed tube 81. This allows the agent to be drawn into the fixed tube 81 through the feed pipe 86. When the rotating agitator 63 brings the third electromagnet 88 away from the second electromagnet 87, the sliding rod 82 and other components will reset under the action of the spring 84 (the attraction force of the second electromagnet 87 and the third electromagnet 88 is greater than the force of the spring 84, so they attract each other when energized, and after separation, the spring 84 can also reset the sliding rod 82). This forces the agent in the fixed tube 81 to be squeezed out through the discharge pipe 85. The discharged agent will quickly mix with the sprayed water under the action of the rotating agitator 63, achieving rapid dissolution and mixing. When the stirring plate 63 moves away from the fixed pipe 81 again, the agent will be replenished through the storage box 90, thus achieving continuous addition of agent.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat exchange device for a flue gas fan, comprising a heat exchanger (1) and a connecting pipe (2) connected to the heat exchanger (1); characterized in that: A cooling mechanism (10) is provided at one end of the heat exchanger (1). The cooling mechanism (10) includes a connecting frame (11) disposed on one side of the heat exchanger (1), a connecting pipe (12) connected to the connecting pipe (2) is fixedly installed inside the connecting frame (11), and an air outlet pipe (13) connected to the connecting pipe (12) is fixedly installed on one side of the connecting frame (11). A water pump (14) is fixedly installed on the top of the connecting frame (11). A water pump (15) and a water outlet pipe (16) connected to the inside are fixedly installed on the water pump (14). One end of the water outlet pipe (16) is inside the connecting frame (11). One end of the water pump (15) is connected to the storage box (17) inside the connecting frame (11). Two symmetrically arranged and inclined guide plates (18) are fixedly installed on the top of the storage box (17). A slot (19) is provided between the two guide plates (18).

2. The heat exchange device for a smoke exhaust fan according to claim 1, characterized in that: The connecting frame (11) is provided with a diversion mechanism (20). The diversion mechanism (20) includes a hollow diversion frame (22) fixed in the connecting frame (11) by a number of fixing rods (21). One end of the water outlet pipe (16) is connected to the inside of the diversion frame (22), and the bottom of the diversion frame (22) is provided with a number of liquid outlet holes (23) that are connected to the inside.

3. The heat exchange device for a smoke exhaust fan according to claim 2, characterized in that: An auxiliary mechanism (30) is provided inside the connecting frame (11). The auxiliary mechanism (30) includes several auxiliary frames (31) that are fixedly installed inside the connecting frame (11) and are semi-circular in shape. The auxiliary frame (31) is located below the connecting pipe (12) and has an outlet pipe (32) that passes through it. Two detachable filter screens (33) are installed inside the outlet pipe (32), and activated carbon is placed between the two filter screens (33). The auxiliary frame (31) has several arc-shaped baffles (34) that abut against the connecting pipe (12) fixedly installed inside. One side of the baffle (34) has a through groove (35) that passes through itself. The inside of the through groove (35) is rotatably connected to a rotating plate (36) with a magnetic material at the top by a torsion spring. The inside of the baffle (34) has a first electromagnet (37) fixedly installed inside. A filtration mechanism (38) is provided on the baffle (34). The filtration mechanism (38) includes a sleeve (381) that is fixedly installed between the baffle (34) and the outlet pipe (32) and is inclined. A push rod (382) is slidably connected inside the sleeve (381) through a sleeve plate (384). An elastic rope (385) is fixedly installed between the sleeve plate (384) and the inside of the sleeve (381). An arc-shaped fixing plate (383) is fixedly installed at one end of the push rod (382). Several cone rods (386) are fixedly installed on one side of the sleeve plate (384).

4. The heat exchange device for a smoke exhaust fan according to claim 1, characterized in that: A dispersing mechanism (40) is provided inside the connecting pipe (12), and the dispersing mechanism (40) includes a first fan blade (41) installed inside the connecting pipe (12).

5. The heat exchange device for a smoke exhaust fan according to claim 4, characterized in that: The connecting pipe (12) has several irregularly arranged and arc-shaped diverter plates (42) fixedly installed inside, and one side of the diverter plate (42) has several through holes that penetrate itself.

6. The heat exchange device for a smoke exhaust fan according to claim 1, characterized in that: The connecting pipe (12) and the connecting pipe (2) are connected by an adapter mechanism (50). The adapter mechanism (50) includes an adapter pipe (51) fixedly connected to the connecting pipe (12). The adapter pipe (51) gradually increases in size from the end closer to the connecting pipe (12) to the end farther away from the connecting pipe (12). A rubber collar (52) is fixedly installed on the outer surface of the connecting pipe (12).

7. The heat exchange device for a smoke exhaust fan according to claim 1, characterized in that: The storage box (17) is provided with a stirring mechanism (60). The stirring mechanism (60) includes several support rods (61) fixedly connected to the guide plate (18). The surface of the support rod (61) is rotatably sleeved with a second fan blade (62) located at the slot (19). The bottom of the second fan blade (62) is fixedly installed with an arc-shaped stirring plate (63).

8. The heat exchange device for a smoke exhaust fan according to claim 7, characterized in that: Several cooling plates (70) are fixedly installed on the inner bottom of the storage box (17).

9. A heat exchange device for a smoke exhaust fan according to claim 7, characterized in that: The storage box (17) is provided with a discharge mechanism (80). The discharge mechanism (80) includes a fixed tube (81) fixedly installed inside the storage box (17). A sliding rod (82) with a sealing plate (83) is slidably connected inside the fixed tube (81). A spring (84) is fixedly installed between the fixed tube (81) and the sealing plate (83). One side of the fixed tube (81) is fixedly installed with a discharge pipe (85) that is connected to the inside and has a one-way valve, and one end of the fixed tube (81) is fixedly installed with a feed pipe (86) that is connected to the inside and has a one-way valve. A second electromagnet (87) is fixedly installed at one end of the sliding rod (82), and a third electromagnet (88) is provided on the stirring plate (63).

10. A heat exchange device for a smoke exhaust fan according to claim 9, characterized in that: A storage box (90) is fixedly installed on one side of the connecting frame (11), and one end of the feed pipe (86) is connected to the inside of the storage box (90).

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