A fully laser-welded bulging long plate heat exchanger and process for high-salt dust working conditions

Abstract

The present invention relates to a fully laser-welded bulging long plate heat exchanger for high-salt dust working conditions, comprising a heat exchanger main body, wherein the heat exchanger main body comprises a fixed support plate foot, a fixed support plate, a fastening semicircular slot hole, a tail support column, a tail support beam, a support top beam, a guide rail beam, and a support rod; the fixed support plate foot is provided with multiple groups, the fixed support plate is fixedly arranged on the multiple groups of fixed support plate foot, the upper edge of the fixed support plate is provided with multiple groups of fastening semicircular slot holes on both sides, the tail support beam is fixedly arranged on the tail support column, and the guide rail beam is provided with two groups, which are arranged relatively up and down, and the two ends are respectively fixedly arranged on the fixed support plate and the top of the support top beam. The present invention can effectively improve the pressure resistance of the heat exchanger, reduce the leakage caused by corrosion of the sealing ring in a high-salt flue gas environment, improve the welding density, reduce the blockage caused by high-salt dust residue, reduce the difficulty of cleaning, reduce the difficulty of dismantling and cleaning, and reduce labor intensity.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and in particular to a fully laser-welded bulged long plate heat exchanger and a process for high-salt dust working conditions. Background Art

[0002] A plate heat exchanger is a highly efficient heat exchanger composed of a series of stacked, corrugated metal sheets. Thin rectangular channels are formed between the plates, through which heat is exchanged. Plate heat exchangers are ideal for liquid-to-liquid and liquid-to-vapor heat exchange. They feature high heat transfer efficiency, minimal heat loss, a compact and lightweight structure, a small footprint, wide application, and a long service life. Under the same pressure loss conditions, their heat transfer coefficient is 3-5 times higher than that of a tubular heat exchanger, requiring only one-third the floor space, and can achieve heat recovery rates exceeding 90%.

[0003] There are two main types of plate heat exchangers: frame type (detachable type) and brazing type. There are three main types of plates: herringbone corrugated plates, horizontal straight corrugated plates and knob-shaped plates.

[0004] Plate heat exchangers have a higher heat transfer coefficient than shell-and-tube heat exchangers. Because the different corrugated plates are inverted, forming complex flow paths, the fluid flows in a rotating, three-dimensional pattern between the plates, generating turbulence at lower Reynolds numbers. This results in a high heat transfer coefficient, generally considered 3-5 times that of shell-and-tube heat exchangers. The logarithmic mean temperature difference is large, while the terminal temperature difference is small. In a shell-and-tube heat exchanger, the two fluids flow in the tube side and shell side, respectively, generally in a cross-current flow pattern, resulting in a small correction coefficient for the logarithmic mean temperature difference. Plate heat exchangers, on the other hand, typically use parallel or countercurrent flow, and their correction coefficient is typically around 0.95. Furthermore, the cold and hot fluids in a plate heat exchanger flow parallel to the heat transfer surface, with no bypass flow. This results in a small terminal temperature difference, allowing heat transfer to water to be less than 1°C, compared to 5°C for a shell-and-tube heat exchanger. The plate heat exchanger also occupies a small footprint. Plate heat exchangers are compact, with a heat transfer area per unit volume 2-5 times that of shell-and-tube heat exchangers. Unlike shell-and-tube heat exchangers, they don't require maintenance space for extracting the tube bundle. Therefore, to achieve the same heat transfer capacity, a plate heat exchanger occupies approximately 1 / 5-1 / 8 the floor space of a shell-and-tube heat exchanger. It's easy to change the heat transfer area or process mix; simply adding or removing a few plates can increase or decrease the heat transfer area. Changing the plate arrangement or replacing a few plates can achieve the desired process mix and adapt to new heat transfer conditions, whereas it's almost impossible to increase the heat transfer area of a shell-and-tube heat exchanger. They're also inexpensive; using the same materials and with the same heat transfer area, plate heat exchangers are approximately 40%-60% less expensive than shell-and-tube heat exchangers. They're also easy to manufacture; the heat transfer plates of plate heat exchangers are stamped, resulting in a high degree of standardization and mass production, while shell-and-tube heat exchangers are generally handmade. Easy to clean: Frame-type plate heat exchangers can be loosened by simply loosening the compression bolts, allowing the plates to be removed for mechanical cleaning. This is very convenient for heat exchange processes that require frequent cleaning of equipment. Low heat loss: In plate heat exchangers, only the outer shell of the heat transfer plate is exposed to the atmosphere, so heat loss is negligible and no insulation is required. Shell-and-tube heat exchangers, on the other hand, experience high heat loss and require an insulation layer. Small capacity: approximately 10% to 20% of that of a shell-and-tube heat exchanger. High pressure loss per unit length: Due to the small gaps between the heat transfer surfaces and the presence of uneven surfaces, the pressure loss is greater than that of traditional smooth tubes. Scaling is less likely: Due to sufficient internal turbulence, scaling is less likely, with a scaling coefficient of only 1 / 3 to 1 / 10 that of a shell-and-tube heat exchanger.

[0005] The operating pressure of a plate radiator should not be too high, as this may cause leakage. Plate heat exchangers are sealed with gaskets, and the operating pressure should generally not exceed 2.5 MPa. The medium temperature should be below 250°C, otherwise leakage may occur. They are prone to clogging. Because the channels between the plates are very narrow, generally only 2-5 mm, the heat exchange medium containing large particles or fibers can easily clog the channels.

[0006] The current plate heat exchanger is difficult to use for flue gas recovery with high salt dust because it is not easy to clean. The existing ones all have multiple returns between the cold side and the hot side, while the hot side and the cold side have only one return. The flow direction between the cold and hot fluids in each return is perpendicular to each other, with cross flow.

[0007] For example, application number 202011561502.3 discloses a corrosion-resistant flue gas plate heat exchanger, which relates to the technical field of plate heat exchangers and includes a frame, a shell and a heat exchange module, wherein the shell is mounted on the frame, the heat exchange module is mounted inside the shell, and the heat exchange module is made of corrosion-resistant material; a flue gas inlet pipe is connected to the top of the shell, a flue gas outlet pipe is connected to the bottom of the shell, and the flue gas inlet pipe and the flue gas outlet pipe are connected to the hot medium channel of the heat exchange module; a clean gas inlet pipe is connected to one side wall of the shell, and a clean gas outlet pipe is connected to the side of the shell away from the clean gas inlet pipe, and the clean gas inlet pipe and the clean gas outlet pipe are connected to the cold medium channel of the heat exchange module; a rapping assembly is connected to the frame, and the rapping assembly rappers the shell. This application has the effect of shaking off dust and granular impurities adhering to the heat exchange module during flue gas heat exchange, thereby reducing the occurrence of scaling in the heat exchange module.

[0008] However, most current plate heat exchangers are unable to withstand high-pressure media. In high-salt flue gas environments, seals are susceptible to corrosion and leakage. Conventional welding is prone to cracking, resulting in poor weld tightness. High-salt dust residue can cause blockages, making cleaning difficult and labor-intensive. Uneven assembly and extrusion forces can also lead to leaks. Summary of the Invention

[0009] The technical problems to be solved by this invention are to improve the pressure resistance of heat exchangers, reduce leakage caused by corrosion of sealing rings in high-salt flue gas environments, improve welding density, reduce blockage caused by high-salt dust residue, reduce cleaning difficulty, reduce disassembly and cleaning difficulty, and reduce labor intensity. This also alleviates the problem of leakage caused by uneven assembly and extrusion force.

[0010] In order to solve the above technical problems, the present invention provides a fully laser-welded bulging long plate heat exchanger for high-salt dust working conditions, including a heat exchanger main body, wherein the heat exchanger main body includes a fixed support plate foot, a fixed support plate, a fastening semicircular slot hole, a tail support column, a tail support beam, a support top beam, a guide rail beam, and a support rod; the fixed support plate foot is provided with multiple groups, the fixed support plate is fixedly arranged on the multiple groups of fixed support plate foot, the fixed support plate has multiple groups of fastening semicircular slot holes on both sides of the upper edge, the tail support beam is fixedly arranged on the tail support column, and the guide rail beam is provided with two groups, which are arranged relative to each other in an upper and lower manner, and the two ends are respectively fixedly arranged on the fixed support plate and the top of the support top beam, and the top of the guide rail beam of the upper group is fixedly provided with a support top beam, and the support rod is provided with multiple groups, and the two ends are respectively fixedly arranged on the fixed support plate and the top of the support top beam;

[0011] The heat exchanger body is fixedly provided with a plurality of heat exchange fin assemblies for exchanging heat;

[0012] A floating pressure plate assembly for extrusion and leakage prevention is fixedly arranged on the heat exchanger body.

[0013] Preferably, a gas heat source inlet, a gas heat source outlet, a medium liquid inlet, and a medium liquid outlet are fixedly provided on the fixed support plate; the gas heat source inlet and the gas heat source outlet are arranged on the same vertical side, the medium liquid inlet and the medium liquid outlet are arranged on the same vertical side, the gas heat source inlet is arranged below the gas heat source outlet, and the medium liquid inlet is arranged above the medium liquid outlet;

[0014] Preferably, the heat exchange fin assembly includes a first heat exchange fin and a second heat exchange fin; the heat exchange fin assembly is provided with multiple groups, the first heat exchange fin and the second heat exchange fin are mirror images of each other, and are provided with a fin front and a fin back, and the fin fronts of the first heat exchange fin and the second heat exchange fin are contacted and welded into one;

[0015] Preferably, the front surfaces of the first heat exchange fins and the second heat exchange fins are both provided with special-shaped chain welding columns that are mirror images of each other, and two groups of the special-shaped chain welding columns are contact-welded;

[0016] Preferably, the heat exchange fin assembly includes a circular sealing ring and a special-shaped sealing ring, the first heat exchange fin is provided with a gas main channel A, a gas main channel B, a liquid main channel A, and a liquid main channel B, the gas main channel A and the gas main channel B are arranged on the same vertical side, the liquid main channel A and the liquid main channel B are arranged on the same vertical side, the gas main channel A, the gas main channel B, the liquid main channel A, and the liquid main channel B on the second heat exchange fin are coaxially corresponding to the gas main channel A, the gas main channel B, the liquid main channel A, and the liquid main channel B on the first heat exchange fin, and the gas main channel A, the gas main channel B, the liquid main channel A, and the liquid main channel B on the two adjacent groups of the heat exchange fin assemblies are coaxially arranged; the front of the fin is provided with plate surface reinforcement punchings along its four sides, and a plurality of groups of divergent gas guide grooves are provided along the gas main channel A and the gas main channel B to the middle position, and the fin A plurality of groups of oblique flow grooves are provided in the middle position of the front side, and a gas heat source flow cavity is provided inside the special-shaped chain-type welded columns on the first heat exchange fin and the second heat exchange fin; the back side of the fin is punched by the divergent gas guide grooves and the oblique flow grooves to form a plurality of guide blocks, and a liquid guide groove and a liquid reflux groove are formed in the middle of the guide blocks formed by the plurality of divergent gas guide grooves, and a liquid diversion groove is formed in the middle of the guide blocks formed by the plurality of oblique flow grooves; a circular sealing groove is provided on the back side of the fin around the gas main channel A and the gas main channel B, and a special-shaped sealing groove is provided on the back side of the fin around the liquid main channel A, the liquid main channel B, the liquid guide groove, the liquid reflux groove, and the liquid diversion groove; the circular sealing ring is fixedly provided in the circular sealing groove between the two groups of the heat exchange fin assemblies, and the special-shaped sealing ring is fixedly provided in the special-shaped sealing groove between the two groups of the heat exchange fin assemblies;

[0017] Preferably, the two groups of guide rail beams are provided with wedge-shaped bosses, and the wedge-shaped bosses are provided with quick-release avoidance grooves on the side close to the tail support column. The first heat exchange fins and the second heat exchange fins are provided with top wedge-shaped positioning grooves on the top and bottom wedge-shaped positioning grooves on the bottom. The top wedge-shaped positioning grooves are movably sleeved on the wedge-shaped bosses on the upper guide rail beam, and the bottom wedge-shaped positioning grooves are movably sleeved on the wedge-shaped bosses on the lower guide rail beam.

[0018] Preferably, the floating pressure plate assembly includes a fin pressure plate, a support shaft seat, and a support roller; the upper and lower sides of the fin pressure plate are respectively provided with wedge-shaped guide grooves, which are movably sleeved on the wedge-shaped bosses on the two groups of guide rail beams; two groups of support shaft seats are provided, which are fixedly provided on the fin pressure plate; the support roller is movably provided between the two groups of support shaft seats through a short shaft and a bearing, and is tangent to the upper guide rail beam; the fin pressure plate is provided with a special-shaped sealing groove on the side close to the heat exchange fin assembly;

[0019] Preferably, the fully laser-welded bulging long plate heat exchanger for high-salt dust working conditions further includes a self-cleaning device, which includes an oscillator, a water inlet tee, and a water outlet tee; the oscillator is provided in multiple groups, which are evenly fixed on the side of the fin pressure plate away from the heat exchange fin assembly, the gas heat source air inlet on the fixed support plate is fixedly provided with a water outlet tee, the gas heat source air outlet on the fixed support plate is fixedly provided with the water inlet tee, the water inlet tee is provided with an air outlet and a water inlet perpendicular to each other, and the water outlet tee is provided with an air inlet and a water outlet perpendicular to each other;

[0020] Preferably, the fully laser-welded bulging long plate heat exchanger for high-salt dust working conditions further includes a constant clamping mechanism, which includes a motor fixing boss, a right-angle reducer, a motor, a screw, an ejector support, and a fixing rod; a plurality of groups of motor fixing bosses are fixedly arranged on the tail support column, a plurality of groups of right-angle reducers are provided, which are fixedly arranged on a plurality of groups of motor fixing bosses, and a motor is fixedly arranged on each group of right-angle reducers, a plurality of groups of screws are provided, which are movably arranged in each group of right-angle reducers, and a ejector support is movably provided on the screw through a bearing, and the ejector support is fixedly arranged on the side of the fin pressure plate away from the heat exchange fin assembly; a plurality of groups of fixing rods are provided, which are fixedly arranged in the fastening semicircular slot holes through nuts;

[0021] A process for using a fully laser-welded bulging long plate heat exchanger for high-salt dust conditions includes the following steps:

[0022] S1. Multiple groups of heat exchange fin assemblies are movably mounted on the wedge-shaped bosses on the two groups of guide rail beams through the top wedge-shaped positioning grooves and the bottom wedge-shaped positioning grooves one by one; when disassembling the heat exchange fin assemblies, they are removed one by one through the quick-release avoidance grooves;

[0023] S2, the fin pressing plate slides linearly along the wedge-shaped boss on the guide rail beam, and the support roller is tangent to the upper guide rail beam, supporting the fin pressing plate to slide linearly along the guide rail beam;

[0024] S3, the motor drives the screw to rotate through the right-angle reducer, and the screw moves linearly along the axis of the screw, and the screw is provided with an ejection support through a bearing to push the fin pressure plate to move linearly along the guide rail beam;

[0025] S4, the high-salt dust gas enters the gas heat source circulation cavity through the gas main channel B of the first group of heat exchange fin assemblies, flows out through the gas main channel A, enters the gas main channel A of the second group of heat exchange fin assemblies, then enters the gas heat source circulation cavity of the second group of heat exchange fin assemblies, and flows out through the gas main channel B of the second group of heat exchange fin assemblies, and operates alternately in an S shape;

[0026] S5, the heat exchange medium liquid enters the space restricted by the special-shaped sealing ring between the first and second groups of heat exchange fin assemblies through the liquid main channel A of the first group of heat exchange fin assemblies, flows out through the liquid main channel B, enters the liquid main channel B of the second group of heat exchange fin assemblies, then enters the space restricted by the special-shaped sealing ring between the second and third groups of heat exchange fin assemblies, and flows out through the liquid main channel A of the second group of heat exchange fin assemblies, and operates alternately in an S-shape;

[0027] S6. During normal operation, the high-salt dust fume enters the water outlet tee through the air inlet, then enters the gas heat source air inlet, flows into the water inlet tee through the gas heat source air outlet, and then flows out through the air outlet;

[0028] S7. When cleaning the heat exchange fin assembly, clean water enters the water inlet tee through the water inlet, enters the gas heat source outlet, enters the gas heat source inlet, enters the water outlet tee, and flows out through the water outlet;

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. By setting up multiple groups of heat exchange fin assemblies, the first heat exchange fin and the second heat exchange fin are welded to form a gas channel cavity in the middle. The expansion and pressure process is adopted. The high-pressure fluid flows through the narrow channel of the plate, making full use of the high-pressure bearing advantage of the expansion and pressure plate; the low-pressure fluid flows through the wide channel, making full use of its low resistance drop advantage; at the same time, the heat exchange fin assembly is welded to form a gas channel cavity, which effectively avoids the corrosion of the sealing ring due to high-salt flue gas, prevents leakage, and improves the service life.

[0031] 2. The heat source gas enters from the bottom and exits from the top, while the medium liquid enters from the top and exits from the bottom. Except for a small inlet and outlet section, full counterflow is achieved for the longest possible length. The hot (flue gas) side and the cold (air or exhaust gas) side have a uniform return path, a complete single return path. Plate lengths can be manufactured from 6 to 12 meters depending on the equipment's location. No header is required, minimizing equipment space.

[0032] 3. By installing special-shaped chain welding columns and utilizing a laser chain double-seam deep penetration welding process, high temperatures are generated within a very small area, rapidly melting the material and forming a molten pool. This results in welds with a high aspect ratio. The heat input to the workpiece is very low, minimizing thermal deformation and the heat-affected zone. The high post-weld cooling rate refines the weld structure and improves weld density. Combined with an adjustable inflation manufacturing process, the gas heat source flow cavity remains unobstructed, increasing its volume.

[0033] 4. By setting up a floating pressure plate assembly, the stability and smoothness of the fin pressure plate operation can be effectively improved. By setting up the special-shaped sealing groove on the fin pressure plate, the leakage caused by uneven pressure of the fin pressure plate or uneven force caused by long-term use can be effectively reduced.

[0034] 5. By setting up an oscillator, the residual dust on the inner wall of the high-salt dust in the heat exchange fin assembly can be vibrated and then discharged out of the body with the high-pressure flue gas, achieving a self-cleaning effect.

[0035] 6. By setting the water inlet tee and water outlet tee in the self-cleaning device, when the internal cleaning of the equipment is required, the vent valve is closed, the water valve is connected, and the gas channel cavity is flushed with high-pressure water, which reduces the time and labor occupied by dismantling and cleaning, and improves the degree of automation of the equipment. At the same time, regular water flushing increases the service life of the equipment and effectively prevents dust blockage.

[0036] 7. By setting up a quick-release avoidance groove, when the heat exchange fin assembly needs to be dismantled and cleaned, it is only necessary to move the floating pressure plate assembly back to the quick-release avoidance groove, and the heat exchange fin assembly can be directly removed from the quick-release avoidance groove, which reduces the difficulty of disassembly and cleaning and reduces labor intensity.

[0037] 8. By setting a constant clamping mechanism, when assembly is required, the optimal width to be squeezed is calculated by installing the number of heat exchange fin assemblies, and the set value is entered into the system. The constant clamping mechanism is used to achieve the precise position, which can maintain the optimal state while effectively preventing the squeeze from being too tight or too loose, which may affect the service life. At the same time, the use of a constant clamping mechanism can ensure the uniformity of the acceptance and effectively prevent leakage caused by uneven force. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described in detail below with reference to the accompanying drawings:

[0039] Figure 1 It is a right side view of the present invention;

[0040] Figure 2 This is the main view of the present invention;

[0041] Figure 3 A top view of the present invention;

[0042] Figure 4 It is a left side view of the present invention;

[0043] Figure 5 It is a schematic diagram of the three-dimensional structure of the present invention;

[0044] Figure 6 for Figure 1 Schematic diagram of the structure of the cross section in the AA direction;

[0045] Figure 7 for Figure 6 A partial enlarged schematic diagram of area B in the middle;

[0046] Figure 8 This is a front view of the special-shaped sealing ring of the present invention;

[0047] Figure 9 This is a front view of the first heat exchange fin of the present invention;

[0048] Figure 10 This is a rear view of the first heat exchange fin of the present invention;

[0049] Figure 11 This is a left side view of the heat exchange fin assembly of the present invention;

[0050] Figure 12 for Figure 11 Schematic diagram of the structure of the cross section in the CC direction;

[0051] Figure 13 for Figure 12 A partial enlarged schematic diagram of the middle D area;

[0052] Figure 14 for Figure 2 Schematic diagram of the structure of the cross section in the EE direction;

[0053] Figure 15 for Figure 14 A partial enlarged schematic diagram of the middle F area;

[0054] In the figure: 1. Heat exchanger body; 101. Fixed support plate foot; 102. Fixed support plate; 103. Gas heat source inlet; 104. Gas heat source outlet; 105. Medium liquid inlet; 106. Medium liquid outlet; 107. Fastening semicircular slot; 108. Tail support column; 109. Tail support beam; 110. Support top beam; 111. Guide rail beam; 112. Support rod; 113. Wedge-shaped boss; 114, quick-release avoidance groove; 2, heat exchange fin assembly; 201, first heat exchange fin; 202, second heat exchange fin; 203, circular sealing ring; 204, special-shaped sealing ring; 205, front of fin; 206, back of fin; 207, plate surface reinforcement punching; 208, special-shaped chain welding column; 209, divergent air guide groove; 210, oblique flow groove; 211, gas heat source flow cavity; 212, gas main channel A; 21 3. Gas main channel B; 214. Liquid main channel A; 215. Liquid main channel B; 216. Diversion punch; 217. Liquid diversion groove; 218. Liquid diversion groove; 219. Liquid reflux groove; 220. Circular sealing groove; 221. Special-shaped sealing groove; 222. Top wedge-shaped positioning groove; 223. Bottom wedge-shaped positioning groove; 3. Floating pressure plate assembly; 301. Fin pressure plate; 302. Support shaft seat; 303. Support roller Shaft; 304, wedge-shaped guide groove; 305, special-shaped sealing groove; 4, self-cleaning device; 401, oscillator; 402, water inlet tee; 403, water outlet tee; 404, air inlet; 405, water inlet; 406, air outlet; 407, water outlet; 5, constant clamping mechanism; 501, motor fixing boss; 502, right-angle reducer; 503, motor; 504, screw; 505, ejector support; 506, fixing rod; DETAILED DESCRIPTION

[0055] Example

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0057] See also Figures 1-15A fully laser welded bulging long plate heat exchanger for high salt dust working conditions, comprising a heat exchanger body 1, the heat exchanger body 1 comprising a fixed support plate foot 101, a fixed support plate 102, a fastening semicircular slot 107, a tail support column 108, a tail support beam 109, a support top beam 110, a guide rail beam 111, and a support rod 112; the fixed support plate foot 101 is provided with multiple groups, the fixed support plate 102 is fixedly arranged on the multiple groups of the fixed support plate foot 101, the fixed support plate 1 02 has multiple sets of fastening semicircular slots 107 on both sides of the upper edge, the tail support beam 109 is fixedly set on the tail support column 108, the guide rail beam 111 is provided with two sets, which are arranged opposite to each other up and down, and the two ends are respectively fixed to the fixed support plate 102 and the top of the support beam 110, and the top of the guide rail beam 111 on the upper side is fixed with the support beam 110, and the support rod 112 is provided with multiple sets, and the two ends are respectively fixed to the fixed support plate 102 and the top of the support beam 110;

[0058] The heat exchanger body 1 is fixedly provided with a plurality of heat exchange fin assemblies 2 for exchanging heat;

[0059] The heat exchanger body 1 is fixedly provided with a floating pressure plate assembly 3 for extrusion and leakage prevention.

[0060] In some embodiments, see Figure 5 The fixed support plate 102 is fixedly provided with a gas heat source inlet 103, a gas heat source outlet 104, a medium liquid inlet 105, and a medium liquid outlet 106; the gas heat source inlet 103 and the gas heat source outlet 104 are arranged on the same vertical side, and the medium liquid inlet 105 and the medium liquid outlet 106 are arranged on the same vertical side, the gas heat source inlet 103 is arranged below the gas heat source outlet 104, and the medium liquid inlet 105 is arranged above the medium liquid outlet 106;

[0061] In some embodiments, see Figure 11The heat exchange fin assembly 2 includes a first heat exchange fin 201 and a second heat exchange fin 202; the heat exchange fin assembly 2 is provided with multiple groups, the first heat exchange fin 201 and the second heat exchange fin 202 are mirror images of each other, and are provided with a fin front 205 and a fin back 206, and the fin front 205 of the first heat exchange fin 201 and the second heat exchange fin 202 are in contact and welded into one; by setting up multiple groups of heat exchange fin assemblies, the first heat exchange fin and the second heat exchange fin are welded to form a gas channel cavity in the middle, and an expansion and pressing process is adopted, and the high-pressure fluid flows through the narrow channel of the plate, making full use of the high-pressure bearing advantage of the expansion and pressing plate; the low-pressure fluid flows through the wide channel, making full use of its low resistance drop advantage; at the same time, the heat exchange fin assembly adopts welding to form a gas channel cavity, which effectively avoids the corrosion of the sealing ring due to high-salt flue gas, prevents leakage, and improves the service life.

[0062] In some embodiments, see Figure 13 Mirror images of each other's special-shaped chain welding posts 208 are installed on the front faces 205 of the first and second heat exchange fins 201, 202. Two sets of these special-shaped chain welding posts 208 are contact-welded. By installing these special-shaped chain welding posts and utilizing a laser chain double-seam deep penetration welding process, high temperatures are generated within a very small area, rapidly melting the material and forming a molten pool. This results in a weld with a high aspect ratio. The heat input to the workpiece is very low, minimizing thermal deformation and the heat-affected zone. The high post-weld cooling rate refines the weld structure and improves weld density. Combined with an adjustable inflation manufacturing process, the gas heat source flow cavity remains unobstructed, increasing its volume.

[0063] In some embodiments, see Figure 9-10The heat exchange fin assembly 2 includes a circular sealing ring 203 and a special-shaped sealing ring 204. The first heat exchange fin 201 is provided with a gas main channel A212, a gas main channel B213, a liquid main channel A214, and a liquid main channel B215. The gas main channel A212 and the gas main channel B213 are arranged on the same vertical side, and the liquid main channel A214 and the liquid main channel B215 are arranged on the same vertical side. The gas main channel A212, the gas main channel B213, the liquid main channel A214, and the liquid main channel B215 on the second heat exchange fin 202 are connected to the gas main channel A212, the gas main channel B213, the liquid main channel A214, and the liquid main channel B215 on the first heat exchange fin 201. A214 and liquid main channel B215 are coaxially corresponding, and the gas main channel A212, gas main channel B213, liquid main channel A214, and liquid main channel B215 on the two adjacent groups of heat exchange fin assemblies 2 are coaxially arranged; the front side 205 of the fin is provided with plate surface reinforcement punching 207 along its four sides, and multiple groups of divergent gas guide grooves 209 are provided along the gas main channel A212 and gas main channel B213 to the middle position, and multiple groups of bevel flow grooves 210 are provided in the middle position of the front side 205 of the fin, and the special-shaped chain welding column 208 on the first heat exchange fin 201 and the second heat exchange fin 202 is provided with a gas heat source flow cavity 211; the back side 206 of the fin is protected by the The divergent gas guide grooves 209 and the oblique flow grooves 210 are punched to form multiple groups of guide blocks 216, and the guide blocks 216 formed by the multiple groups of divergent gas guide grooves 209 form liquid guide grooves 217 and liquid reflux grooves 219 in the middle, and the guide blocks 216 formed by the multiple groups of oblique flow grooves 210 form liquid diversion grooves 218 in the middle; a circular sealing groove 220 is opened on the back side of the fin 206 around the gas main channel A212 and the gas main channel B213, and a special-shaped sealing groove 221 is opened on the back side of the fin 206 around the liquid main channel A214, the liquid main channel B215, the liquid guide groove 217, the liquid reflux groove 219, and the liquid diversion groove 218; the circular sealing groove 220 is opened on the back side of the fin 206 around the liquid main channel A214, the liquid main channel B215, the liquid guide groove 217, the liquid reflux groove 219, and the liquid diversion groove 218; The shaped sealing ring 203 is fixedly arranged in the circular sealing groove 220 between the two groups of the heat exchange fin assemblies 2, and the special-shaped sealing ring 204 is fixedly arranged in the special-shaped sealing groove 221 between the two groups of the heat exchange fin assemblies 2; when in use, the high-salt dust gas enters the gas heat source circulation cavity 211 through the gas main channel B213 of the first group of the heat exchange fin assemblies 2, flows out through the gas main channel A212, enters the gas main channel A212 of the second group of the heat exchange fin assemblies 2, and then enters the gas heat source circulation cavity 211 of the second group of the heat exchange fin assemblies 2, and flows out through the gas main channel B213 of the second group of the heat exchange fin assemblies 2, and runs alternately in an S shape;The heat exchange medium liquid enters the space confined by the special-shaped sealing ring 204 between the first and second groups of heat exchange fin assemblies 2 through the liquid main channel A214 of the first group of heat exchange fin assemblies 2, then flows out through the liquid main channel B215, enters the liquid main channel B215 of the second group of heat exchange fin assemblies 2, and then enters the space confined by the special-shaped sealing ring 204 between the second and third groups of heat exchange fin assemblies 2, and flows out through the liquid main channel A214 of the second group of heat exchange fin assemblies 2, in an alternating S-shaped pattern. The gas heat source enters from the bottom and exits from the top, while the medium liquid enters from the top and exits from the bottom. Except for a small number of inlet and outlet sections, full countercurrent flow is achieved for the maximum length, with uniform return strokes on both the hot (flue gas) side and the cold (air or exhaust gas) side. The plate length can be 6 to 12 meters depending on the equipment's location. No header is required, reducing the equipment's footprint.

[0064] In some embodiments, see Figure 10 、 Figure 15 The two groups of guide rail beams 111 are provided with wedge-shaped bosses 113, and the wedge-shaped bosses 113 are provided with quick-release avoidance grooves 114 on the side close to the tail support column 108. The tops of the first heat exchange fins 201 and the second heat exchange fins 202 are provided with top wedge-shaped positioning grooves 222, and the bottoms are provided with bottom wedge-shaped positioning grooves 223. The top wedge-shaped positioning grooves 222 are movably sleeved on the wedge-shaped bosses 113 on the upper guide rail beam 111, and the bottom wedge-shaped positioning grooves 223 are movably sleeved on the wedge-shaped bosses 113 on the lower guide rail beam 111. Boss 113; when in use, multiple groups of the heat exchange fin assemblies 2 are movably sleeved on the wedge-shaped bosses 113 on the two groups of guide rail beams 111 through the top wedge-shaped positioning groove 222 and the bottom wedge-shaped positioning groove 223; when disassembling the heat exchange fin assemblies 2, they are removed one by one through the quick-release avoidance groove 114; by setting the quick-release avoidance groove, when the heat exchange fin assembly needs to be disassembled and cleaned, it is only necessary to move the floating pressure plate assembly back to the quick-release avoidance groove, and the heat exchange fin assembly can be directly removed from the quick-release avoidance groove, which reduces the difficulty of disassembly and cleaning and reduces labor intensity.

[0065] In some embodiments, see Figure 15The floating pressure plate assembly 3 includes a fin pressure plate 301, a support shaft seat 302, and a support roller 303; the upper and lower sides of the fin pressure plate 301 are respectively provided with wedge-shaped guide grooves 304, which are movably mounted on the wedge-shaped bosses 113 on the two groups of guide rail beams 111, and the support shaft seat 302 is provided with two groups, which are fixedly set on the fin pressure plate 301, and the support roller 303 is movably set between the two groups of support shaft seats 302 through a short shaft and a bearing, and is tangent to the upper side of the guide rail beam 111; the fin pressure plate 301 is close to the A special-shaped sealing groove 305 is provided on one side of the heat exchange fin assembly 2; when in use, the fin pressure plate 301 slides linearly along the wedge-shaped boss 113 on the guide beam 111, and the support roller 303 is tangent to the upper guide beam 111, supporting the fin pressure plate 301 to slide linearly along the guide beam 111; by setting up a floating pressure plate assembly, the stability and smoothness of the fin pressure plate operation can be effectively improved, and by setting up the special-shaped sealing groove on the fin pressure plate, leakage caused by uneven pressure on the fin pressure plate or uneven force due to long-term use is effectively reduced.

[0066] In some embodiments, see Figure 1 、 Figure 6The fully laser-welded bulging long plate heat exchanger for high-salt dust working conditions also includes a self-cleaning device 4, which includes an oscillator 401, a water inlet tee 402, and a water outlet tee 403; the oscillator 401 is provided with multiple groups, which are evenly fixed on the side of the fin pressing plate 301 away from the heat exchange fin assembly 2, and the gas heat source air inlet 103 on the fixed support plate 102 is fixedly provided with a water outlet tee 403, and the gas heat source air outlet 104 on the fixed support plate 102 is fixedly provided with the water inlet tee 402, and the water inlet 402 is perpendicularly provided with an air outlet 406 and a water inlet 405, and the water outlet tee 403 is perpendicularly provided with an air inlet 404 and an outlet Water outlet 407; during use, when working normally, the high-salt dust flue gas enters the water outlet tee 403 through the air inlet 404, and then enters the gas heat source air inlet 103, flows into the water inlet tee 402 through the gas heat source air outlet 104, and then flows out through the air outlet 406; when the heat exchange fin assembly 2 is cleaned, clean water enters the water inlet tee 402 through the water inlet 405, enters the gas heat source air outlet 104, enters the gas heat source air inlet 103, enters the water outlet tee 403, and flows out through the water outlet 407; by setting an oscillator, the residual dust on the inner wall of the high-salt dust in the heat exchange fin assembly can be vibrated and then discharged from the body with the high-pressure flue gas, thereby achieving a self-cleaning effect. By setting the water inlet tee and water outlet tee in the self-cleaning device, when the internal cleaning of the equipment is required, the vent valve is closed, the water valve is connected, and the gas channel cavity is flushed with high-pressure water, which reduces the time and labor occupied by dismantling and cleaning, and improves the degree of automation of the equipment. At the same time, regular water flushing increases the service life of the equipment and effectively prevents dust clogging.

[0067] In some embodiments, see Figure 4The fully laser-welded bulging long plate heat exchanger for high-salt dust working conditions also includes a constant clamping mechanism 5, which includes a motor fixing boss 501, a right-angle reducer 502, a motor 503, a screw 504, an ejection support 505, and a fixing rod 506; a plurality of groups of motor fixing bosses 501 are fixedly provided on the tail support column 108, a plurality of groups of right-angle reducers 502 are provided, which are fixedly provided on a plurality of groups of motor fixing bosses 501, and a motor 503 is fixedly provided on each group of right-angle reducers 502, a plurality of groups of screws 504 are provided, which are movably provided in each group of right-angle reducers 502, and the screws 504 are movably provided with an ejection support 505 through a bearing, and the ejection support 505 is fixedly provided on the side of the fin pressing plate 301 away from the heat exchange fin assembly 2; There are multiple groups of fixing rods 506, which are fixed in the fastening semicircular slots 107 by nuts; when in use, the motor 503 drives the screw rod 504 to rotate through the right-angle reducer 502, and moves linearly along the axis of the screw rod 504, and the screw rod 504 is provided with a ejector support 505 through a bearing movement, thereby pushing the fin pressure plate 301 to move linearly along the guide rail beam 111; by setting a constant clamping mechanism, when assembly is required, the optimal width to be extruded is calculated by installing the number of pieces of the heat exchange fin assembly, and the set value is entered into the system. The constant clamping mechanism is used to achieve a precise position, which can maintain the optimal state while effectively preventing the extrusion from being too tight or too loose, which affects the service life. At the same time, the use of a constant clamping mechanism can ensure the uniformity of the acceptance and effectively prevent leakage caused by uneven force.

[0068] A process for using a fully laser-welded bulging long plate heat exchanger for high-salt dust conditions includes the following steps:

[0069] S1. Multiple groups of heat exchange fin assemblies 2 are movably mounted on the wedge-shaped bosses 113 on the two groups of guide rail beams 111 through the top wedge-shaped positioning grooves 222 and the bottom wedge-shaped positioning grooves 223 . When disassembling the heat exchange fin assemblies 2, they are removed one by one through the quick-release avoidance grooves 114 .

[0070] S2, the fin pressing plate 301 slides linearly along the wedge-shaped boss 113 on the guide rail beam 111, and the support roller 303 is tangent to the upper guide rail beam 111, supporting the fin pressing plate 301 to slide linearly along the guide rail beam 111;

[0071] S3, the motor 503 drives the screw rod 504 to rotate through the right-angle reducer 502, and the screw rod 504 moves linearly along the axis of the screw rod 504. The screw rod 504 is provided with an ejector support 505 through a bearing, thereby pushing the fin pressing plate 301 to move linearly along the guide rail beam 111;

[0072] S4, the high-salt dust gas enters the gas heat source circulation cavity 211 through the gas main channel B213 of the first group of the heat exchange fin assembly 2, flows out through the gas main channel A212, enters the gas main channel A212 of the second group of the heat exchange fin assembly 2, and then enters the gas heat source circulation cavity 211 of the second group of the heat exchange fin assembly 2, and flows out through the gas main channel B213 of the second group of the heat exchange fin assembly 2, and operates alternately in an S shape;

[0073] S5, the heat exchange medium liquid enters the space restricted by the special-shaped sealing ring 204 between the first and second groups of heat exchange fin assemblies 2 through the liquid main channel A214 of the first group of heat exchange fin assemblies 2, flows out through the liquid main channel B215, enters the liquid main channel B215 of the second group of heat exchange fin assemblies 2, and then enters the space restricted by the special-shaped sealing ring 204 between the second and third groups of heat exchange fin assemblies 2, and flows out through the liquid main channel A214 of the second group of heat exchange fin assemblies 2, and runs alternately in an S shape;

[0074] S6. During normal operation, the high-salt dust fume enters the water outlet tee 403 through the air inlet 404, then enters the gas heat source air inlet 103, flows into the water inlet tee 402 through the gas heat source air outlet 104, and then flows out through the air outlet 406;

[0075] S7. When the heat exchange fin assembly 2 is cleaned, clean water enters the water inlet tee 402 through the water inlet 405, enters the gas heat source outlet 104, enters the gas heat source inlet 103, enters the water outlet tee 403, and flows out through the water outlet 407;

[0076] Obviously, the above embodiments are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all embodiments here. However, such obvious variations or modifications arising from the spirit of the present invention remain within the scope of protection of the present invention.

Claims

1. A fully laser-welded bulged long plate heat exchanger for high-salt dust conditions, characterized by: The heat exchanger comprises a main body (1), wherein the main body (1) comprises a fixed support plate foot (101), a fixed support plate (102), a fastening semicircular slot (107), a tail support column (108), a tail support beam (109), a support top beam (110), a guide rail beam (111), and a support rod (112); the fixed support plate foot (101) is provided with a plurality of groups, the fixed support plate (102) is fixedly provided on the plurality of groups of fixed support plate foot (101), and the fixed support plate (102) is provided with a plurality of groups of fixed support plate foot (101) on both sides of the upper edge. There are multiple groups of fastening semicircular slot holes (107), the tail support beam (109) is fixedly arranged on the tail support column (108), the guide rail beam (111) is provided with two groups, which are arranged in an upper and lower relative manner, and the two ends are respectively fixedly provided on the top of the fixed support plate (102) and the support top beam (110), and the top of the upper group of guide rail beams (111) is fixedly provided with the support top beam (110), and the support rod (112) is provided with multiple groups, and the two ends are respectively fixedly provided on the top of the fixed support plate (102) and the support top beam (110); The heat exchanger body (1) is fixedly provided with a plurality of heat exchange fin assemblies (2) for exchanging heat; A floating pressure plate assembly (3) for preventing leakage by extrusion is fixedly provided on the heat exchanger body (1); A gas heat source inlet (103), a gas heat source outlet (104), a medium liquid inlet (105), and a medium liquid outlet (106) are fixedly provided on the fixed support plate (102); the gas heat source inlet (103) and the gas heat source outlet (104) are provided on the same vertical side, the medium liquid inlet (105) and the medium liquid outlet (106) are provided on the same vertical side, the gas heat source inlet (103) is provided below the gas heat source outlet (104), and the medium liquid inlet (105) is provided above the medium liquid outlet (106); The heat exchange fin assembly (2) comprises a first heat exchange fin (201) and a second heat exchange fin (202); the heat exchange fin assembly (2) is provided with a plurality of groups, the first heat exchange fin (201) and the second heat exchange fin (202) are mirror images of each other, and are provided with a fin front face (205) and a fin back face (206); the fin front faces (205) of the first heat exchange fin (201) and the second heat exchange fin (202) are contact-welded into one body; The fin front surfaces (205) of the first heat exchange fin (201) and the second heat exchange fin (202) are both provided with special-shaped chain welding columns (208) that are mirror images of each other, and two groups of the special-shaped chain welding columns (208) are contact-welded; The heat exchange fin assembly (2) comprises a circular sealing ring (203) and a special-shaped sealing ring (204); a gas main channel A (212), a gas main channel B (213), a liquid main channel A (214), and a liquid main channel B (215) are provided on the first heat exchange fin (201); the gas main channel A (212) and the gas main channel B (213) are arranged on the same vertical side; the liquid main channel A (214) and the liquid main channel B (215) are arranged on the same vertical side; the gas main channel A (212), the gas main channel B (213), the liquid main channel A (214), and the liquid main channel B (215) on the second heat exchange fin (202) are provided. 15) The gas main channel A (212), the gas main channel B (213), the liquid main channel A (214), and the liquid main channel B (215) are coaxially corresponding to the first heat exchange fin (201), and the gas main channel A (212), the gas main channel B (213), the liquid main channel A (214), and the liquid main channel B (215) on two adjacent groups of the heat exchange fin assemblies (2) are coaxially arranged; the front face (205) of the fin is provided with plate surface strengthening punching holes (207) along its four sides, and a plurality of groups of divergent gas guide grooves (209) are provided along the gas main channel A (212) and the gas main channel B (213) to the middle position, and the front face of the fin is provided with a plurality of divergent gas guide grooves (209) (205) A plurality of groups of oblique flow grooves (210) are provided in the middle position, and a gas heat source flow cavity (211) is provided inside the special-shaped chain welding column (208) on the first heat exchange fin (201) and the second heat exchange fin (202); the back side (206) of the fin is punched by the divergent gas guide groove (209) and the oblique flow groove (210) to form a plurality of groups of guide blocks (216), and the guide blocks (216) formed by the plurality of groups of the divergent gas guide grooves (209) form liquid guide grooves (217) and liquid reflux grooves (219) in the middle, and the guide blocks (216) formed by the plurality of groups of the oblique flow grooves (210) form liquid diversion grooves in the middle. Grooves (218); a circular sealing groove (220) is provided on the back side of the fin (206) around the gas main channel A (212) and the gas main channel B (213); a special-shaped sealing groove is provided on the back side of the fin (206) around the liquid main channel A (214), the liquid main channel B (215), the liquid guide groove (217), the liquid reflux groove (219), and the liquid diversion groove (218); the circular sealing ring (203) is fixedly arranged in the circular sealing groove (220) between the two groups of the heat exchange fin assemblies (2), and the special-shaped sealing ring (204) is fixedly arranged in the special-shaped sealing groove between the two groups of the heat exchange fin assemblies (2).

2. The laser-welded bulged long plate heat exchanger for high-salt dust conditions according to claim 1 is characterized in that: A wedge-shaped boss (113) is provided on the two groups of guide rail beams (111), and a quick-release avoidance groove (114) is provided on the side of the wedge-shaped boss (113) close to the tail support column (108). The top of the first heat exchange fin (201) and the second heat exchange fin (202) are provided with a top wedge-shaped positioning groove (222), and the bottom is provided with a bottom wedge-shaped positioning groove (223). The top wedge-shaped positioning groove (222) is movably mounted on the wedge-shaped boss (113) on the upper guide rail beam (111), and the bottom wedge-shaped positioning groove (223) is movably mounted on the wedge-shaped boss (113) on the lower guide rail beam (111).

3. The laser-welded bulged long plate heat exchanger for high-salt dust working conditions according to claim 2 is characterized in that: The floating pressure plate assembly (3) comprises a fin pressure plate (301), a support shaft seat (302), and a support roller (303); the fin pressure plate (301) is provided with a wedge-shaped guide groove (304) on the upper and lower sides, respectively, and is movably mounted on the wedge-shaped bosses (113) on the two groups of guide rail beams (111); two groups of support shaft seats (302) are provided, which are fixedly mounted on the fin pressure plate (301); the support roller (303) is movably mounted between the two groups of support shaft seats (302) through a short shaft and a bearing, and is tangent to the upper guide rail beam (111); the fin pressure plate (301) is provided with a special-shaped sealing groove on the side close to the heat exchange fin assembly (2).

4. The fully laser welded bulged long plate heat exchanger for high salt dust conditions according to claim 3 is characterized in that: The fully laser-welded bulging long plate heat exchanger for high-salt dust working conditions further includes a self-cleaning device (4), which includes an oscillator (401), a water inlet tee (402), and a water outlet tee (403); the oscillator (401) is provided in multiple groups and is evenly fixedly arranged on the side of the fin pressing plate (301) away from the heat exchange fin assembly (2); the gas heat source air inlet (103) on the fixed support plate (102) is fixedly provided with a water outlet tee (403); the gas heat source air outlet (104) on the fixed support plate (102) is fixedly provided with the water inlet tee (402); the water inlet tee (402) is provided with an air outlet (406) and a water inlet (405) perpendicular to each other, and the water outlet tee (403) is provided with an air inlet (404) and a water outlet (407) perpendicular to each other.

5. The fully laser welded bulged long plate heat exchanger for high salt dust conditions according to claim 4 is characterized in that: The fully laser-welded bulging long plate heat exchanger for high-salt dust working conditions further comprises a constant pressing mechanism (5), the constant pressing mechanism (5) comprising a motor fixing boss (501), a right-angle reducer (502), a motor (503), a screw (504), an ejection support (505), and a fixing rod (506); a plurality of motor fixing bosses (501) are fixedly provided on the tail support column (108), and a plurality of right-angle reducers (502) are provided, which are fixedly provided on the plurality of motor fixing bosses (501). A motor (503) is fixedly provided on each group of the right-angle reducers (502); a plurality of the screw rods (504) are provided and are movably provided in each group of the right-angle reducers (502); the screw rods (504) are movably provided with ejection supports (505) through bearings; the ejection supports (505) are fixedly provided on the side of the fin pressing plate (301) away from the heat exchange fin assembly (2); a plurality of the fixing rods (506) are provided and are fixedly provided in the fastening semicircular slots (107) through nuts.

6. The process for using a fully laser welded bulged long plate heat exchanger for high-salt dust conditions according to claim 5 is characterized in that: The steps include: S1, multiple groups of the heat exchange fin assemblies (2) are movably sleeved on the wedge-shaped bosses (113) on the two groups of the guide rail beams (111) through the top wedge-shaped positioning grooves (222) and the bottom wedge-shaped positioning grooves (223); when the heat exchange fin assemblies (2) are disassembled, they are removed one by one through the quick-release avoidance grooves (114); S2, the fin pressing plate (301) slides linearly along the wedge-shaped boss (113) on the guide rail beam (111), and the supporting roller (303) is tangent to the upper guide rail beam (111), supporting the fin pressing plate (301) to slide linearly along the guide rail beam (111); S3, the motor (503) drives the screw rod (504) to rotate through the right-angle reducer (502), and the screw rod (504) moves linearly along the axis direction of the screw rod (504), and the screw rod (504) is provided with an ejection support (505) through a bearing, thereby pushing the fin pressing plate (301) to move linearly along the guide rail beam (111); S4, the high-salt dust gas enters the gas heat source circulation cavity (211) through the gas main channel B (213) of the first group of heat exchange fin assemblies (2), flows out through the gas main channel A (212), enters the gas main channel A (212) of the second group of heat exchange fin assemblies (2), and then enters the gas heat source circulation cavity (211) of the second group of heat exchange fin assemblies (2), and flows out through the gas main channel B (213) of the second group of heat exchange fin assemblies (2), and operates alternately in an S shape; S5, the heat exchange medium liquid enters the space limited by the special-shaped sealing ring (204) between the first and second groups of heat exchange fin assemblies (2) through the liquid main channel A (214) of the first group of heat exchange fin assemblies (2), flows out through the liquid main channel B (215), enters the liquid main channel B (215) of the second group of heat exchange fin assemblies (2), and then enters the space limited by the special-shaped sealing ring (204) between the second and third groups of heat exchange fin assemblies (2), and flows out through the liquid main channel A (214) of the second group of heat exchange fin assemblies (2), and runs alternately in an S shape in sequence; S6. During normal operation, the high-salt dust fume enters the water outlet tee (403) through the air inlet (404), then enters the gas heat source air inlet (103), flows into the water inlet tee (402) through the gas heat source air outlet (104), and then flows out through the air outlet (406); S7. When the heat exchange fin assembly (2) is cleaned, clean water enters the water inlet tee (402) through the water inlet (405), enters the gas heat source outlet (104), enters the gas heat source inlet (103), enters the water outlet tee (403), and flows out through the water outlet (407).

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