Heat exchanger

Abstract

The present application relates to the technical fields of flue gas heat exchange, and discloses a heat exchange device, which comprises a shell, a liquid inlet guide pipe, a liquid outlet guide pipe, heat exchange pipes and a cover shell, the shell is provided with a flue gas inlet and a flue gas outlet at two ends respectively, a heat exchange space is formed in the shell, the liquid inlet guide pipe and the liquid outlet guide pipe are arranged in the heat exchange space, the liquid inlet of the liquid inlet guide pipe and the liquid outlet of the liquid outlet guide pipe both extend to the outside of the shell, the liquid inlet guide pipe and the liquid outlet guide pipe are communicated through the heat exchange pipes, all the heat exchange pipes pass through the cover shell and are communicated with the liquid inlet guide pipe and the liquid outlet guide pipe respectively, and the liquid inlet guide pipe and the liquid outlet guide pipe are located on the same side of the heat exchange pipes. The cover shell and the liquid receiving groove arranged at the connecting position between the liquid inlet guide pipe and the heat exchange pipes effectively solve the problem that the leakage at the connecting position between the liquid inlet guide pipe and the heat exchange pipes is not easy to be found in the process of recycling high-temperature flue gas heat, which leads to serious fouling of the heat exchange pipes and affects the heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of flue gas heat exchange technology, and is a heat exchange device. Background Technology

[0002] Industrial production processes often generate large amounts of high-temperature flue gas. Directly treating and releasing this flue gas would result in a waste of its significant heat content. Therefore, heat exchangers are typically used to recover heat from the flue gas during actual production. High-temperature flue gas heat recovery is a crucial industrial energy-saving technology, primarily utilizing waste heat recovery devices to convert the heat energy in the flue gas into usable energy. Currently, various high-temperature flue gas heat recovery technologies have been developed in the industry, including traditional boiler recovery, dedicated heat exchanger recovery, and waste heat power generation systems. Specifically, it can be used to heat the absorbent-rich liquid after the flue gas has reacted with it, thereby improving the subsequent desorption efficiency of the absorbent-rich liquid.

[0003] Currently, flue gas heat exchangers typically utilize a main inlet pipe, partially located outside and partially inside the heat exchange space, to introduce rich absorbent solution from the outside into the space. The solution is then distributed to multiple heat exchange tubes connected to the main inlet pipe. However, leaks are prone to occur at the connection between the main inlet pipe and the heat exchange tubes, and most leaks are difficult to detect in time. This results in a large amount of rich absorbent solution leaking and spraying onto the heat exchange tubes, causing severe scaling and affecting heat exchange efficiency. Furthermore, the rich absorbent solution generates CO2 gas during heat exchange on the tube surface, causing gas-liquid stratification on the smooth tube wall surface, further reducing heat exchange effectiveness.

[0004] Chinese patent document CN215175108U discloses a three-medium glass tube heat exchanger for treating sulfur-containing tail gas. This utility model includes a shell with a flue gas passage along its length. Inside the shell are an air heat exchange zone near the flue gas passage inlet and a tail gas heat exchange zone near the flue gas passage outlet. Air heat exchange tube assemblies and tail gas heat exchange tube assemblies are respectively arranged in the air and tail gas heat exchange zones, each including multiple glass heat exchange tubes. This utility model utilizes the waste heat of the high-temperature flue gas to directly exchange heat between the tail gas to be incinerated and the combustion air, increasing the temperature of both media, fully utilizing the waste heat of the flue gas, reducing fuel consumption, and achieving energy saving. This utility model uses glass tubes as heat exchange tubes, which are non-clogging, non-corrosive, and leak-free.

[0005] Chinese patent document CN110174005B discloses a large-capacity condensing heat exchanger, including a main frame and a flue gas box body mounted on the main frame. A flue gas inlet is located on the left side of the flue gas box body, and a flue gas outlet is located on the right side. Two sets of condenser modules are arranged alternately from left to right within the flue gas box body, each set consisting of two sets of condenser modules arranged side-by-side. A sludge collection tank with a drain outlet is located at the bottom of the flue gas box body. This large-capacity condensing heat exchanger exhibits good sealing performance, eliminates leakage risks, is easy to maintain, has a long service life, and offers reliable economic and environmental performance. It is particularly suitable for large-capacity low-temperature flue gas treatment and utilization in wet desulfurization of large coal-fired power units, achieving energy and water conservation, and reducing emissions.

[0006] Chinese patent document CN219319123U discloses a pressure heat exchange device for preventing leakage and blockage. This utility model includes: a heat exchange tube body with a support plate, and a dummy tube at one end of the heat exchange tube body; a vent valve installed at the end of the heat exchange tube body with the dummy tube; a water tank at the other end of the heat exchange tube body; and a leakage-prevention mechanism located between the heat exchange tube body and the water tank, used to isolate flue gas from the water tank. By incorporating the vent valve, water tank, and leakage-prevention mechanism, the service life of the heat exchange tube is effectively improved, while achieving double sealing isolation between the flue gas and water sides. This solves the problem of water leakage into the flue causing ash accumulation and blockage, thus improving the overall safety and stability of the heat exchange device and significantly increasing heat exchange efficiency.

[0007] The above three inventions aim to solve the problem of corrosion and leakage in heat exchange equipment during flue gas heat exchange using different methods. CN215175108U mainly relies on glass tube heat exchangers to avoid medium leakage, but the materials used in the heat exchange equipment have certain limitations. CN110174005B mainly addresses the potential leakage problem in the welded parts of the condensation heat exchange device and each heat exchange tube during the cooling and condensation process of wet flue gas, which is different from the high-temperature flue gas heat exchange condition. CN219319123U involves water as the medium to be heated in the flue gas, which is different from the absorbent rich liquid in this application. Furthermore, no cleaning facilities are provided for the dirt on the pipes.

[0008] Therefore, it is essential to research and invent a heat exchange device to improve the utilization rate of waste heat from high-temperature flue gas, the stability of equipment operation, and extend its service life. Summary of the Invention

[0009] This invention provides a heat exchange device that overcomes the shortcomings of the prior art. It can effectively solve the problem that leakage at the connection between the heat exchange device and the heat exchange tube is difficult to detect during the heat recovery and utilization of high-temperature flue gas, resulting in severe scaling of the heat exchange tube and affecting the heat exchange efficiency.

[0010] The technical solution of the present invention is achieved through the following measures: a heat exchange device comprising a shell, an inlet guide pipe, an outlet guide pipe, a heat exchange tube, and a cover. The shell has a flue gas inlet and a flue gas outlet at both ends, forming a heat exchange space inside the shell. The inlet guide pipe and the outlet guide pipe are arranged in the heat exchange space. The inlet of the inlet guide pipe and the outlet of the outlet guide pipe extend to the outside of the shell. The inlet guide pipe and the outlet guide pipe are connected through the heat exchange tube. All heat exchange tubes pass through the cover and are connected to the inlet guide pipe and the outlet guide pipe, respectively. The inlet guide pipe and the outlet guide pipe are located on the same side of the heat exchange tube. The inner surface of the heat exchange tube is coated with a spiral striped coating containing zeolite components.

[0011] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0012] The thickness of the spiral striped coating is set to 100 μm to 150 μm.

[0013] Multiple flow guiding structures are provided on both sides of the heat exchange space. The flow guiding structures extend in the same direction as the liquid inlet flow guiding pipe and the liquid outlet flow guiding pipe. A cover is provided on the side of the flow guiding structure that connects to the heat exchange pipe.

[0014] The aforementioned flow guiding structure includes a head flow guiding structure, a tail flow guiding structure, and at least one intermediate flow guiding structure. The head flow guiding structure is connected to the liquid inlet flow guiding pipe via multiple heat exchange tubes and is also connected to the flow guiding structure on the opposite side via multiple heat exchange tubes. The tail flow guiding structure is connected to the liquid outlet flow guiding pipe via multiple heat exchange tubes and is also connected to the flow guiding structure on the opposite side via multiple heat exchange tubes. The intermediate flow guiding structure is connected to two adjacent flow guiding structures on the opposite side via multiple heat exchange tubes.

[0015] The aforementioned flow guiding structure includes two flow guiding pipes and two connecting pipes. The two connecting pipes are respectively located at both ends of the two flow guiding pipes and connect the two flow guiding pipes.

[0016] The aforementioned housing includes a first part and a second part. The first part is provided with a plurality of first clearance grooves, and the second part is provided with a plurality of second clearance grooves. The first part and the second part are assembled to form the housing, and the first clearance grooves and the second clearance grooves clamp the heat exchange tubes.

[0017] A liquid receiving tank is provided in the heat exchange space, and the liquid receiving tank is located at the bottom of the cover.

[0018] The bottom wall of the heat exchange space is provided with multiple support ribs. The support ribs are in contact with the connecting pipe at the bottom of the flow guiding structure. The part of the support rib located in the liquid receiving tank is provided with liquid flow holes.

[0019] The top of the aforementioned flow guide structure is connected to an exhaust pipe, which extends longitudinally to the outside of the heat exchange space.

[0020] The heat exchange space is equipped with multiple spray pipes, which extend in the same direction as the heat exchange pipes. A drain trough is provided at the bottom of the heat exchange space, and the drain outlet of the drain trough is located outside the heat exchange space.

[0021] This invention utilizes the heat from flue gas to heat the absorbent-rich liquid, while simultaneously desorbing the gas adsorbed in the absorbent-rich liquid, achieving integrated heat exchange and desorption. Enclosures are installed at the inlet and outlet guide pipes, and at the connection points between the guide structure and the heat exchange tubes, ensuring that leakage of the absorbent-rich liquid remains within a controllable range, laying the foundation for the safe operation of the carbon capture system utilizing flue gas waste heat. By coating the inner surface of the heat exchange tubes with a spiral striped coating containing zeolite, the foaming temperature of the absorbent is reduced by approximately 5°C, enhancing the two-phase flow heat transfer within the heat exchange tubes, thereby enabling deeper absorption of the flue gas waste heat. Attached Figure Description

[0022] Appendix Figure 1 This is a first schematic isometric view of the heat exchange device of Embodiment 9 of the present invention;

[0023] Appendix Figure 2 This is a second schematic isometric view of the heat exchange device of Embodiment 9 of the present invention;

[0024] Appendix Figure 3 This is a first schematic cross-sectional view of the heat exchange device of Embodiment 10 of the present invention;

[0025] Appendix Figure 4 This is a second schematic isometric view of the heat exchange device of Embodiment 10 of the present invention;

[0026] Appendix Figure 5 This is a schematic diagram of part of the internal structure of the heat exchange device in Embodiment 10 of the present invention;

[0027] Appendix Figure 6 This is a partial schematic top view of the liquid inlet guide pipe in the heat exchange device of Embodiment 1 of the present invention;

[0028] Appendix Figure 7 This is a schematic diagram of the casing in the heat exchange device of Embodiment 6 of the present invention;

[0029] Appendix Figure 8 This is a schematic diagram of the flow guiding structure in the heat exchange device of Embodiment 5 of the present invention;

[0030] Appendix Figure 9 This is a partial schematic cross-sectional view of the heat exchange device in Embodiment 8 of the present invention.

[0031] The codes in the attached diagram are as follows: 100 is the shell, 101 is the heat exchange space, 102 is the flue gas inlet, 103 is the flue gas outlet, 104 is the liquid receiving tank, 105 is the liquid drain tank, 110 is the support rib, 111 is the liquid flow hole, 200 is the liquid inlet guide pipe, 201 is the liquid inlet, 300 is the heat exchange tube, 400 is the cover, 410 is the first part, 411 is the first clearance groove, 420 is the second part, 421 is the second clearance groove, 500 is the liquid outlet guide pipe, 501 is the liquid outlet, 610 is the first end guide structure, 620 is the last end guide structure, 630 is the middle guide structure, 640 is the guide pipe, 650 is the connecting pipe, 700 is the exhaust pipe, and 800 is the spray pipe. Detailed Implementation

[0032] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can also refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] The present invention will be further described below with reference to embodiments:

[0036] Example 1: As shown in the attached document Figures 1 to 6As shown, the heat exchange device includes a shell 100, an inlet guide pipe 200, an outlet guide pipe 500, a heat exchange tube 300, and a cover 400. A flue gas inlet 102 and a flue gas outlet 103 are respectively provided at both ends of the shell 100. A heat exchange space 101 is formed inside the shell 100. The inlet guide pipe 200 and the outlet guide pipe 500 are arranged within the heat exchange space 101. The liquid outlet 501 extends to the outside of the shell 100. The liquid inlet guide pipe 200 and the liquid outlet guide pipe 500 are connected by heat exchange pipe 300. All heat exchange pipes 300 pass through the cover 400 and are connected to the liquid inlet guide pipe 200 and the liquid outlet guide pipe 500 respectively. The liquid inlet guide pipe 200 and the liquid outlet guide pipe 500 are located on the same side of the heat exchange pipe 300. The inner surface of the heat exchange pipe 300 is coated with a spiral striped coating containing zeolite.

[0037] In this invention, the shell 100 has a cuboid portion located in the middle, and the shell contracts from opposite sides of the cuboid portion toward the direction away from the cuboid portion to form a flue gas inlet 102 and a flue gas outlet 103. The axes of the flue gas inlet 102 and the flue gas outlet 103 coincide or substantially coincide, so that the flue gas entering the heat exchange space 101 through the flue gas inlet 102 flows through the heat exchange space 101 without substantially changing its flow direction, and flows out through the flue gas outlet 103.

[0038] As needed, the side where the flue gas inlet 102 is located is defined as the front side of the heat exchange device, and the flue gas outlet 103 is located at the rear side of the heat exchange device. The liquid inlet guide pipe 200 and the liquid outlet guide pipe 500 are disposed in the heat exchange space 101 area enclosed by the cuboid part of the shell 100, and are disposed near the left side wall of the shell 100.

[0039] The portions of the liquid inlet guide pipe 200 and the liquid outlet guide pipe 500 located within the heat exchange space 101 both extend longitudinally. The top of the liquid inlet guide pipe 200 bends toward the left side wall of the shell 100 and extends through the left side wall of the shell 100 to the outside of the heat exchange space 101. The pipe opening on the outside of the liquid inlet guide pipe 200, i.e. the liquid inlet 201, is used to receive external heat exchange medium (absorbent rich liquid).

[0040] As needed, multiple heat exchange tubes 300 are arranged within the heat exchange space 101, respectively connected to the inlet guide pipe 200 and the outlet guide pipe 500, and extending along the left-right direction of the heat exchange device. They are used to receive the heat exchange medium from the inlet guide pipe 200. The absorbent-rich liquid in the inlet guide pipe 200 can be dispersed into the multiple heat exchange tubes 300, and after sufficient heat exchange with the flue gas flowing through the heat exchange space 101, it flows out through the outlet guide pipe 500. It should be noted that... Figure 5 For ease of demonstration, only a portion of the heat exchange tubes 300 is shown.

[0041] As needed, a cover 400 is installed on the side where the inlet and outlet guide pipes 200 and 500 connect to the heat exchange tube 300, isolating the connection points of the inlet and outlet guide pipes 200 and 500 from most of the main body of the heat exchange tube 300. In this way, when a leak occurs at the connection point between the heat exchange tube 300 and the inlet and outlet guide pipes 200 and 500, the cover 400 blocks the sprayed absorbent-rich liquid, preventing the leaked absorbent-rich liquid from spraying onto the heat exchange tube 300 over a large area and causing extensive scaling. Even if the absorbent-rich liquid leak is not detected in time, the heat exchange effect of the heat exchange tube 300 will not be affected, thereby reducing the cleaning and maintenance problems and economic losses caused by absorbent-rich liquid leaks.

[0042] As needed, the absorbent-rich liquid enters the heat exchange tube 300. After being heated by the flue gas, the gas (mainly carbon dioxide) adsorbed in the absorbent-rich liquid is released onto the inner surface of the heat exchange tube 300. The spiral stripe coating guides bubble nucleation and movement, applies tangential force, generates swirling flow, and under the action of centrifugal force, pushes the less dense gas towards the center of the heat exchange tube 300. The spiral stripe coating, combined with a preferred Reynolds number of 1000 to 3000, disrupts the stable gas-liquid interface inside the heat exchange tube 300, forming a slug-shaped or plunger-shaped gas-liquid two-phase flow inside the heat exchange tube 300. The slug-shaped or plunger-shaped flow causes violent mixing of the gas and liquid phases, destroying the absorbent-rich liquid stagnant layer near the inner wall of the heat exchange tube 300, thereby enhancing the heat exchange effect of the heat exchange tube 300.

[0043] Example 2: As an optimization of the above example, although not shown in the figure, the thickness of the spiral striped coating is set to 100 μm to 150 μm.

[0044] As needed, the spiral stripe coating can be formed by the following method: First, the heat exchange tube 300 is tilted at a 45° angle; then, a coating solution containing zeolite components is poured onto the heat exchange tube 300 while the heat exchange tube 300 is rotated at a uniform speed, thereby forming a spiral stripe coating on the inner surface of the heat exchange tube 300.

[0045] Example 3: As an optimization of the above examples, as shown in the appendix Figures 1 to 6 As shown, multiple flow guiding structures are provided on both sides of the heat exchange space 101. The flow guiding structures extend in the same direction as the liquid inlet flow guiding pipe 200 and the liquid outlet flow guiding pipe 500. A cover 400 is provided on the side of the flow guiding structure that connects to the heat exchange pipe 300.

[0046] As needed, a cover 400 is provided on one side of the liquid inlet guide pipe 200, the liquid outlet guide pipe 500 and the guide structure connecting the heat exchange pipe 300. The corresponding heat exchange pipe 300 passes through the cover 400 and is connected to the liquid inlet guide pipe 200, the liquid outlet guide pipe 500 and the guide structure respectively.

[0047] Example 4: As an optimization of the above embodiments, as shown in the appendix Figures 1 to 5 As shown, the flow guiding structure includes a head flow guiding structure 610, a tail flow guiding structure 620, and at least one intermediate flow guiding structure 630. The head flow guiding structure 610 is connected to the liquid inlet flow guiding pipe 200 via multiple heat exchange pipes 300 and is also connected to the flow guiding structure on the opposite side via multiple heat exchange pipes 300. The tail flow guiding structure 620 is connected to the liquid outlet flow guiding pipe 500 via multiple heat exchange pipes 300 and is also connected to the flow guiding structure on the opposite side via multiple heat exchange pipes 300. The intermediate flow guiding structure 630 is connected to two adjacent flow guiding structures on the opposite side via multiple heat exchange pipes 300.

[0048] As needed, one initial flow guide structure 610, one final flow guide structure 620, and five intermediate flow guide structures 630 can be provided. The inlet flow guide pipe 200, the outlet flow guide pipe 500, and three of the intermediate flow guide structures 630 are located on the left side of the shell 100, with the three intermediate flow guide structures 630 positioned between the inlet flow guide pipe 200 and the outlet flow guide pipe 500. The inlet flow guide pipe 200, the outlet flow guide pipe 500, and the three intermediate flow guide structures 630 on the left side of the shell 100 are distributed along the front-to-back direction of the heat exchange device. The initial flow guide structure 610, the final flow guide structure 620, and two of the intermediate flow guide structures 630 are located on the right side of the shell 100, with the two intermediate flow guide structures 630 positioned between the initial flow guide structure 610 and the final flow guide structure 620. The initial flow guide structure 610, the final flow guide structure 620, and the two intermediate flow guide structures 630 on the right side of the shell 100 are distributed along the front-to-back direction of the heat exchange device.

[0049] The first-end flow guiding structure 610 is connected to the liquid inlet flow guiding pipe 200 via multiple heat exchange tubes 300, and is also connected to the first intermediate flow guiding structure 630 from front to back on the left side of the shell 100 via multiple heat exchange tubes 300. The first intermediate flow guiding structure 630 from front to back on the left side is further connected to the first intermediate flow guiding structure 630 from front to back on the right side via multiple heat exchange tubes 300. The first intermediate flow guiding structure 630 from front to back on the right side is further connected to the second intermediate flow guiding structure 630 from front to back on the left side via multiple heat exchange tubes 300. The second intermediate flow guiding structure 630 from front to back on the left side is further connected to the first intermediate flow guiding structure 630 from front to back on the left side via multiple heat exchange tubes 300. Multiple heat exchange tubes 300 are connected to the second intermediate flow guide structure 630 from front to back on the right side. The second intermediate flow guide structure 630 from front to back on the right side is also connected to the third intermediate flow guide structure 630 from front to back on the left side via multiple heat exchange tubes 300. The third intermediate flow guide structure 630 from front to back on the left side is also connected to the end flow guide structure 620 via multiple heat exchange tubes 300. The end flow guide structure 620 is also connected to the liquid outlet flow guide pipe 500 via multiple heat exchange tubes 300. Thus, the liquid inlet flow guide pipe 200, multiple flow guide structures and liquid outlet flow guide pipe 500 form a left-right reciprocating tortuous heat conduction loop.

[0050] As needed, the casing 400 isolates the connection points of the liquid inlet guide pipe 200, the liquid outlet guide pipe 500, and the flow guiding structure with the corresponding heat exchange tube 300, as well as most of the heat exchange tube 300, to prevent leaks at the connection points of the heat exchange tube 300 with the liquid inlet guide pipe 200, the liquid outlet guide pipe 500, and the flow guiding structure from going undetected and causing the absorbent rich liquid to be sprayed onto the heat exchange tube 300 over a large area.

[0051] Depending on the needs, more than one intermediate flow guiding structure 630 can be set, and the intermediate flow guiding structure 630 and its corresponding heat exchange tube 300 are regarded as a heat exchange module. By setting multiple flow guiding structures, the reciprocating heat conduction loop within the heat exchange space 101 can be composed of multiple heat exchange modules, and each heat exchange module can be mass-produced. Compared with using a directly reciprocating heat exchange tube, this invention does not require additional design of the size of the heat exchange tube 300; the number of heat exchange modules can be increased or decreased according to the size of the heat exchange device, making the production and assembly of the heat exchange tube 300 and the flow guiding structure more convenient.

[0052] Example 5: As an optimization of the above embodiments, as shown in the appendix. Figures 1 to 8 As shown, the flow guiding structure includes two flow guiding pipes 640 and two connecting pipes 650. The two connecting pipes 650 are respectively disposed at both ends of the two flow guiding pipes 640 and connect the two flow guiding pipes 640.

[0053] As needed, the guide tubes 640 extend longitudinally, and two connecting tubes 650 are respectively disposed at both ends of the two guide tubes 640. The guide tubes 640 are used to connect the heat exchange tubes 300. In each guide structure, one connecting tube 650 connects the top ends of the two guide tubes 640, and the other connecting tube 650 connects the bottom ends of the two guide tubes 640, thus making the guide structure annular. The annular guide structure is simpler and has a lower cost.

[0054] Example 6: As an optimization of the above embodiments, as shown in the appendix Figures 1 to 6 As shown, the housing 400 includes a first part 410 and a second part 420. The first part 410 is provided with a plurality of first clearance grooves 411, and the second part 420 is provided with a plurality of second clearance grooves 421. The first part 410 and the second part 420 are assembled to form the housing 400. The first clearance grooves 411 and the second clearance grooves 421 clamp the heat exchange tube 300.

[0055] As required, taking the housing 400 matching the liquid inlet guide pipe 200 as an example, the housing 400 has a groove-shaped structure and covers the liquid inlet guide pipe 200 with the groove facing towards it. The first part 410 and the second part 420 of the housing 400 are both right-angled structures formed by the sidewalls and bottom wall of the groove. After the first part 410 and the second part 420 are spliced ​​together, the groove-shaped housing 400 is formed. After the housing 400 is in place, the through hole formed by the first clearance groove 411 and the corresponding second clearance groove 421 matches the diameter of the heat exchange tube 300, thereby stably clamping the heat exchange tube 300.

[0056] The design of clamping the heat exchange tube 300 with the first clearance groove 411 and the second clearance groove 421 allows the heat exchange tube 300 to be connected to the liquid inlet guide pipe 200 (or the liquid outlet guide pipe 500 or the guide structure) first, and then the corresponding cover 400 is installed. This avoids the cover 400 affecting the connection and installation of the heat exchange tube 300 and the liquid inlet guide pipe 200 (or the liquid outlet guide pipe 500 or the guide structure), improves installation efficiency, and facilitates the removal of the cover 400 separately during subsequent use to inspect or repair the connection between the heat exchange tube 300 and other components.

[0057] Example 7: As an optimization of the above embodiments, as shown in the appendix Figures 1 to 9 As shown, a liquid receiving tank 104 is provided in the heat exchange space 101, and the liquid receiving tank 104 is located at the bottom of the cover 400.

[0058] As needed, liquid receiving tanks 104 are provided on the left and right sides of the bottom of the heat exchange space 101, and the liquid receiving tanks 104 are located at the bottom of all the covers 400 on the same side.

[0059] The receiving tank 104 is used to receive liquid that slides down the casing 400. When a leak occurs at the connection between the heat exchange tube 300 and other components, the sprayed absorbent liquid falls onto the side wall of the casing 400 corresponding to the leak point, facing the inlet guide pipe 200, the outlet guide pipe 500, and the guide structure, and flows downward along the side wall of the casing 400, eventually flowing into the receiving tank 104 at the bottom of the casing 400. Thus, the location and extent of the leak can be determined based on the liquid condition in the receiving tank 104.

[0060] As needed, a liquid level detector and a discharge port can be installed on the liquid receiving tank 104 to discharge the leaked liquid to the outside of the housing 100, so as to facilitate real-time monitoring and detection of leakage.

[0061] Example 8: As an optimization of the above embodiments, as shown in the appendix Figures 1 to 9 As shown, the bottom wall of the heat exchange space 101 is provided with multiple support ribs 110. The support ribs 110 are in contact with the connecting pipe 650 at the bottom of the flow guiding structure. The part of the support ribs 110 located in the liquid receiving tank 104 is provided with liquid flow holes 111.

[0062] As needed, the support ribs 110 are used to support the flow guiding structure, which helps to improve the stability of the flow guiding structure; liquid flow holes 111 are set to prevent the support ribs 110 from dividing the liquid receiving tank 104 into independent small spaces, which would affect the use of the liquid receiving tank 104.

[0063] Example 9: As an optimization of the above embodiments, as shown in the appendix Figures 1 to 5 As shown, the top of the flow guide structure is connected to an exhaust pipe 700, which extends longitudinally to the outside of the heat exchange space 101.

[0064] As needed, at least one flow guide structure is provided with an exhaust pipe 700. The exhaust pipe 700 is connected to a connecting pipe 650 at the top of the flow guide structure, and the exhaust pipe 700 extends upward and protrudes from the top wall of the housing 100 to the outside of the housing 100.

[0065] During the heat exchange process between the absorbent-rich liquid and the flue gas, the absorbed gases are released after the absorbent-rich liquid is heated, which will adversely affect the flow of the absorbent-rich liquid. The gas in the guiding structure is discharged to the outside of the heat exchange space 101 through the exhaust pipe 700, thereby reducing the gas content in the absorbent-rich liquid and minimizing the adverse effects on its flow.

[0066] Example 10: As an optimization of the above embodiments, as shown in the appendix Figures 1 to 5 As shown, multiple spray pipes 800 are installed in the heat exchange space 101. The extension direction of the spray pipes 800 is the same as the extension direction of the heat exchange pipes 300. A drain tank 105 is provided at the bottom of the heat exchange space 101, and the drain outlet of the drain tank 105 is located outside the heat exchange space 101.

[0067] Depending on the requirements, the flue gas contains a large amount of particulate matter and dirt. During the process of heat exchange between the flue gas and the absorbent rich liquid through the heat exchange tube 300, the particulate matter and dirt in the flue gas cover the surface of the heat exchange tube 300, forming scale, which affects the heat exchange effect of the heat exchange tube 300.

[0068] The spray pipe 800 extends along the left-right direction of the heat exchange device. Spraying cleaning fluid onto the heat exchange tube 300 through the spray pipe 800 effectively removes scale buildup, ensuring the heat exchange tube 300 maintains good heat exchange performance over a long period. The cleaning fluid can be water or a cleaning agent solution.

[0069] As needed, the heat exchange tubes 300 between the liquid inlet guide pipe 200 and the guide structure, the liquid outlet guide pipe 500 and the guide structure, and between two adjacent guide structures are arranged in two rows, with the two rows of heat exchange tubes 300 staggered. This is to prevent the heat exchange tubes 300 on the side closer to the spray pipe 800 from blocking the heat exchange tubes 300 on the side farther from the spray pipe 800, thus affecting the cleaning effect.

[0070] If necessary, when the support rib 110 is provided, the portion of the support rib 110 outside the liquid receiving tank 104 is provided with a through hole to prevent obstruction of the flow of sewage to the drain tank 105. The drain tank 105 is provided to facilitate the timely discharge of sewage carried by the heat exchange tube 300 from the heat exchange space 101, reducing subsequent cleaning work.

[0071] In summary, this invention, through the use of a modular casing, modular heat exchange tubes, multiple flow guiding structures, and spray pipes, avoids large-area scaling on the surface of the heat exchange tubes caused by absorbent rich liquid leakage, thus reducing economic losses due to absorbent rich liquid leakage. The spray pipes spray cleaning liquid onto the heat exchange tubes to promptly remove scale. A liquid level detector is installed on the receiving tank for timely detection of leaks. A spiral striped coating containing zeolite is applied to the inner surface of the heat exchange tubes, enhancing the heat exchange effect and further improving the performance and reliability of high-temperature flue gas heat exchange processes. Besides the coal-fired power industry, industries such as steel, cement, and chemicals also generate large amounts of high-temperature flue gas during production. These industries also face the risk of leakage in flue gas heat exchange equipment and the need for energy conservation. This invention solves traditional problems while offering significant economic benefits, indicating a huge market potential.

[0072] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A heat exchange device, characterized in that, The device includes a shell, an inlet guide pipe, an outlet guide pipe, heat exchange tubes, and a cover. The shell has a flue gas inlet and an outlet at both ends, forming a heat exchange space within it. The inlet and outlet guide pipes are located within this space, with their inlets and outlets extending outside the shell. These pipes are connected via heat exchange tubes. All heat exchange tubes pass through the cover and connect to the inlet and outlet guide pipes, respectively. The inlet and outlet guide pipes are located on the same side as the heat exchange tubes. The inner surface of the heat exchange tubes is coated with a spiral striped coating containing zeolite. Multiple flow guiding structures are located on both sides of the heat exchange space, extending in the same direction as the inlet and outlet guide pipes. A cover is located on the side of each flow guiding structure connected to the heat exchange tubes. Each flow guiding structure includes a head flow guiding structure, an end flow guiding structure, and at least one intermediate flow guiding structure. The head flow guiding structure is connected to multiple heat exchange tubes via... The heat pipe is connected to the liquid inlet guide pipe and is also connected to the guide structure on the opposite side via multiple heat exchange pipes. The end guide structure is connected to the liquid outlet guide pipe via multiple heat exchange pipes and is also connected to the guide structure on the opposite side via multiple heat exchange pipes. The middle guide structure is connected to two adjacent guide structures on the opposite side via multiple heat exchange pipes. Each of the initial guide structure, the end guide structure, and the middle guide structure includes two guide pipes and two connecting pipes. The two connecting pipes are respectively set at both ends of the two guide pipes and connect the two guide pipes. The thickness of the spiral striped coating is set to 100μm to 150μm. The cover includes a first part and a second part. The first part is provided with multiple first clearance grooves, and the second part is provided with multiple second clearance grooves. The first part and the second part are assembled to form the cover. The first clearance grooves and the second clearance grooves hold the heat exchange pipes. A liquid receiving groove is provided in the heat exchange space. The liquid receiving groove is located at the bottom of the cover.

2. The heat exchange device according to claim 1, characterized in that, The bottom wall of the heat exchange space is provided with multiple support ribs. The support ribs are in contact with the connecting pipe at the bottom of the flow guiding structure. The part of the support rib located in the liquid receiving tank is provided with liquid flow holes.

3. The heat exchange device according to claim 1 or 2, characterized in that, The top of the flow guide structure is connected to an exhaust pipe, which extends longitudinally to the outside of the heat exchange space.

4. The heat exchange device according to claim 1, 2, or 3, characterized in that, The heat exchange space is equipped with multiple spray pipes, which extend in the same direction as the heat exchange pipes. A drain trough is located at the bottom of the heat exchange space, and the drain outlet of the drain trough is located outside the heat exchange space.

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