Supercritical flue gas heat exchanger convenient to clean

Abstract

The application discloses a supercritical flue gas heat exchanger convenient to clean, and belongs to the technical field of supercritical flue gas heat exchanger, which comprises a box body, a plurality of mounting holes formed in the side wall of the box body, an air inlet installed on the left side wall of the box body, an air outlet installed on the right side wall of the box body and aligned with the air inlet, a plurality of guide grooves formed in the box body, a heat exchange assembly installed in the guide grooves and used for heat exchange operation, and a fixing assembly installed on the heat exchange assembly and used for fixing the heat exchange assembly in the box body. The heat exchange assembly is used for inflow and outflow of cooling liquid, heat exchange between high-temperature flue gas and the cooling liquid is realized, the high-temperature flue gas is cooled, when cleaning, the fixing assembly is taken out to release the fixing of the heat exchange assembly, and the heat exchange assembly is taken out from the box body to perform cleaning operation.

Description

Technical Field

[0001] This invention belongs to the field of supercritical flue gas heat exchanger technology, and particularly relates to a supercritical flue gas heat exchanger that is easy to clean. Background Technology

[0002] Supercritical flue gas heat exchangers are high-efficiency heat exchange devices that utilize supercritical fluid technology. They are mainly used in the field of industrial flue gas waste heat recovery. Their core principle is to utilize the characteristics of fluids (usually water or carbon dioxide) in the supercritical state, which combine the high density of liquids and the high diffusivity of gases, to achieve efficient heat transfer between flue gas and working fluid. The equipment is usually composed of heat exchange tube assemblies made of high-temperature alloys. Flue gas releases heat as it flows outside the tubes, while the supercritical working fluid absorbs heat inside the tubes and undergoes a state change, which can directly drive power units or provide process heat. Compared with traditional heat exchangers, its heat exchange efficiency is improved by more than 30%, and it can adapt to flue gas conditions with a wide temperature range of 300-1000℃.

[0003] During the long-term operation of a supercritical heat exchanger, external impurities gradually adhere to the surface of the finned tubes of the heat exchange fins, forming a heat insulation layer. This leads to a significant increase in heat transfer resistance and a substantial decrease in heat exchange efficiency. To restore equipment performance, the heat exchange fins need to be disassembled and thoroughly cleaned periodically. However, the heat exchange pipelines of existing heat exchangers use fixed welding or complex flange connection structures. Disassembly requires specialized tools and involves cumbersome steps, which not only increases maintenance time and costs but may also cause a decrease in pipeline sealing performance due to repeated disassembly and assembly. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides: a supercritical flue gas heat exchanger that is easy to clean, comprising: The enclosure, and a plurality of mounting holes provided on the side wall of the enclosure; An air inlet is installed on the left side wall of the housing, and an air outlet is installed on the right side wall of the housing, which is aligned with the air inlet. Multiple guide grooves are formed inside the housing; A heat exchange assembly, which is installed in the guide groove, is used for heat exchange operations; A fixing component is mounted on the heat exchange component and is used to install the heat exchange component into the housing.

[0005] As a preferred embodiment of the present invention, the heat exchange assembly includes: A frame that is inserted into one or more of the guide slots; A pluggable handrail is installed on one side of the frame, and a heat exchange tube is fixedly connected inside the frame. One end of the heat exchange tube is equipped with a liquid inlet, and the other end of the heat exchange tube is equipped with a liquid outlet.

[0006] As a preferred embodiment of the present invention, a liquid supply side plate is installed on the side of the housing away from the mounting hole; The top of the liquid supply side plate is equipped with a liquid supply pipe and a liquid return pipe, and the liquid supply side plate is equipped with a liquid supply channel and a liquid return channel. The liquid supply channel and the liquid return channel are both connected to the liquid supply pipe and the liquid return pipe.

[0007] In a preferred embodiment of the present invention, the liquid inlet and the liquid outlet are respectively connected to the liquid supply channel and the liquid return channel.

[0008] As a preferred embodiment of the present invention, the fixing component includes: Two first fixing plates are fixedly connected to the side wall of the frame, and multiple slide rails aligned with the frame are fixedly connected to the top and bottom of the box.

[0009] As a preferred embodiment of the present invention, a first slider is slidably connected to the slide rail; A spring is fixedly connected between the first slider and the slide rail, and a first fixing frame is fixedly connected to the first slider; A fixing rod is fixedly connected inside the first fixing frame; A sleeve is rotatably connected to the fixed rod, and a threaded rod that can be inserted into the first fixed plate is fixedly connected to the sleeve.

[0010] As a preferred embodiment of the present invention, a nut is threadedly connected to the threaded rod, and one side of the nut is attached to the first fixing plate.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: When using the flue gas heat exchanger, the operator installs the heat exchange components into the housing, and the fixing components secure the heat exchange components. The mounting holes allow the housing to be installed in the designated area. High-temperature flue gas enters from the inlet, flows through the heat exchange components, and then exits through the outlet. Coolant flows in and out of the heat exchange components, enabling heat exchange between the high-temperature flue gas and the coolant, thus cooling the high-temperature flue gas. During cleaning, the fixing components are removed to release the fixation of the heat exchange components, and the heat exchange components are removed from the housing for cleaning. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of a supercritical flue gas heat exchanger that is easy to clean, provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the internal cross-sectional planar structure of a supercritical flue gas heat exchanger that is easy to clean, provided by an embodiment of the present invention; Figure 3 This is a schematic diagram of the casing structure of a supercritical flue gas heat exchanger that is easy to clean, provided by an embodiment of the present invention; Figure 4This is a schematic diagram of the frame structure of a supercritical flue gas heat exchanger that is easy to clean, provided by an embodiment of the present invention; Figure 5 This invention provides an easy-to-clean supercritical flue gas heat exchanger. Figure 4 A magnified schematic diagram of part A in the middle.

[0013] In the diagram: 1. Housing; 2. Mounting hole; 3. Air inlet; 4. Air outlet; 5. Guide groove; 6. Frame; 7. Plug-in handle; 8. Heat exchange tube; 9. Liquid supply pipe; 10. Liquid return pipe; 11. Liquid supply channel; 12. Liquid return channel; 13. Liquid inlet end; 14. Liquid outlet end; 15. Liquid supply side plate; 16. Slide rail; 17. First slider; 18. Spring; 19. First fixing frame; 20. Fixing rod; 21. Sleeve; 22. Threaded rod; 23. Nut; 24. First fixing plate. Detailed Implementation

[0014] To further understand the invention's content, features, and effects, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0015] The structure of the present invention will now be described in detail with reference to the accompanying drawings.

[0016] Please see Figures 1 to 5 This invention provides a supercritical flue gas heat exchanger that is easy to clean, comprising: a housing 1, and a plurality of mounting holes 2 formed on the side wall of the housing 1; an air inlet 3, which is installed on the left side wall of the housing 1, and an air outlet 4, which is aligned with the air inlet 3, is installed on the right side wall of the housing 1; a plurality of guide grooves 5, which are formed inside the housing 1; a heat exchange assembly, which is installed in the guide grooves 5 for performing heat exchange operations; and a fixing assembly, which is installed on the heat exchange assembly for installing the heat exchange assembly into the housing 1.

[0017] The above scheme is adopted as follows: When the flue gas heat exchanger is needed, the heat exchange components are installed into the housing 1 by the staff and fixed by the fixing components. The housing 1 is installed in the designated area through the mounting holes 2. The high-temperature flue gas enters from the inlet 3, flows through the heat exchange components and is discharged through the outlet 4. At the same time, coolant flows in and out of the heat exchange components. The heat exchange components realize the heat exchange between the high-temperature flue gas and the coolant, thereby cooling the high-temperature flue gas. During cleaning, the fixing components are removed to release the fixation of the heat exchange components, and the heat exchange components are taken out of the housing 1 for cleaning.

[0018] Furthermore, the heat exchange assembly includes: a frame 6 inserted into a plurality of guide grooves 5; a plug-in handle 7 is installed on one side of the frame 6; a heat exchange tube 8 is fixedly connected inside the frame 6; a liquid inlet end 13 is installed at one end of the heat exchange tube 8; and a liquid outlet end 14 is installed at the other end of the heat exchange tube 8.

[0019] Furthermore, a liquid supply side plate 15 is installed on the side of the housing 1 away from the mounting hole 2; a liquid supply pipe 9 and a liquid return pipe 10 are installed on the top of the liquid supply side plate 15, and a liquid supply channel 11 and a liquid return channel 12 are installed inside the liquid supply side plate 15; the liquid supply channel 11 and the liquid return channel 12 are both connected to the liquid supply pipe 9 and the liquid return pipe 10.

[0020] Furthermore, the inlet end 13 and the outlet end 14 are respectively connected to the supply channel 11 and the return channel 12.

[0021] Using the above scheme: In use, the frame 6 is inserted into the corresponding guide groove 5, so that the liquid inlet end 13 and liquid outlet end 14 of the heat exchange tube 8 are connected to the liquid supply channel 11 and the liquid return channel 12, respectively. The working fluid is transported to the pre-set liquid supply channel 11 inside the side plate through the liquid supply pipe 9 at the top of the liquid supply side plate 15. The liquid supply channel 11 is precisely connected to the liquid inlet end 13 of the heat exchange tube 8 in the heat exchange assembly. With the help of the high-pressure conveying device, the pressure and temperature of the working fluid are raised to above the corresponding critical value to form a supercritical fluid. The supercritical working fluid enters the heat exchange tube 8 through the liquid inlet end 13, flows directionally along the tube side, and is discharged from the liquid outlet end 14 after completing the heat exchange. It is collected through the liquid return channel 12 in the liquid supply side plate 15 and then transported to the subsequent system through the liquid return pipe 10 to form a closed-loop supercritical working fluid circulation loop. The liquid supply channel 11 and the liquid return channel 12 are set independently and are both connected to the liquid supply pipe 9 and the liquid return pipe 10.

[0022] It should be noted that: First, the heat exchange tube 8 is made of high-temperature and high-pressure resistant alloy material, and both the liquid inlet end 13 and the liquid outlet end 14 are equipped with high-pressure sealing structures. Second, spiral low fins can be installed on the outer wall of the flue gas side of the heat exchange tube 8, and the surface of the fins is coated with an anti-ash accumulation ceramic coating.

[0023] Furthermore, the fixing components include: two first fixing plates 24 fixedly connected to the side wall of the frame 6, and multiple slide rails 16 aligned with the frame 6 fixedly connected to the top and bottom of the box body 1.

[0024] Furthermore, a first slider 17 is slidably connected to the slide rail 16; a spring 18 is fixedly connected between the first slider 17 and the slide rail 16; a first fixing frame 19 is fixedly connected to the first slider 17; a fixing rod 20 is fixedly connected inside the first fixing frame 19; a sleeve 21 is rotatably connected to the fixing rod 20; and a threaded rod 22 that can be inserted into the first fixing plate 24 is fixedly connected to the sleeve 21.

[0025] Furthermore, a nut 23 is threadedly connected to the threaded rod 22, and one side of the nut 23 is attached to the first fixing plate 24.

[0026] Using the above solution: In use, a torsion spring can be installed between the fixed rod 20 and the sleeve 21. After the frame 6 is inserted into the guide groove 5, the torsion spring causes the sleeve 21 to rotate on the fixed rod 20 on the first fixed frame 19, thereby causing the threaded rod 22 on it to flip to a horizontal position. Then, through the action of the spring 18, the first slider 17 is pushed to move on the slide rail 16 to one side of the first fixed plate 24. After moving to the preset position, the threaded rod 22 will pass through the first fixed plate 24. At this time, the nut 23 is screwed into the threaded rod 22 and rotated so that the nut 23 fits against the surface of the first fixed plate 24, thereby fixing the frame 6 in the box 1.

[0027] It should be noted that if the frame 6 needs to be removed from the box 1 for cleaning of its components, the frame 6 can be removed from the box 1 by reversing the above working principle.

[0028] Working principle of the invention: When the flue gas heat exchanger is needed, insert the frame 6 into the corresponding guide groove 5, so that the liquid inlet end 13 and liquid outlet end 14 of the heat exchange tube 8 are connected to the liquid supply channel 11 and the liquid return channel 12, respectively. After the frame 6 is inserted into the guide groove 5, the sleeve 21 rotates on the fixed rod 20 on the first fixed frame 19 by the action of the torsion spring, thereby driving the threaded rod 22 on it to rotate to the horizontal position. Then, by the action of the spring 18, the first slider 17 is pushed to move on the slide rail 16 to one side of the first fixed plate 24. After moving to the preset position, the threaded rod 22 will pass through the first fixed plate 24. At this time, screw the nut 23 into the threaded rod 22 and rotate the nut 23 so that the nut 23 fits against the surface of the first fixed plate 24, thereby fixing the frame 6 to the housing. In section 1, the housing 1 is installed in the designated area using the mounting hole 2. High-temperature flue gas enters from the air inlet 3. The working fluid is transported to the pre-set liquid supply channel 11 inside the side plate through the liquid supply pipe 9 at the top of the liquid supply side plate 15. The liquid supply channel 11 is precisely connected to the liquid inlet end 13 of the heat exchange tube 8 in the heat exchange component. With the help of the high-pressure conveying device, the pressure and temperature of the working fluid are raised to above the corresponding critical value to form a supercritical fluid. The supercritical working fluid enters the heat exchange tube 8 through the liquid inlet end 13, flows directionally along the tube side, and is discharged from the liquid outlet end 14 after completing the heat exchange. It is collected through the return liquid channel 12 in the liquid supply side plate 15 and then transported to the subsequent system through the return liquid pipe 10 to form a closed-loop supercritical working fluid circulation loop. The liquid supply channel 11 and the return liquid channel 12 are set independently and are both connected to the liquid supply pipe 9 and the return liquid pipe 10.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A supercritical flue gas heat exchanger that is easy to clean, characterized in that, include: The enclosure (1) and a plurality of mounting holes (2) are provided on the side wall of the enclosure (1); An air inlet (3) is installed on the left side wall of the housing (1), and an air outlet (4) is installed on the right side wall of the housing (1) and aligned with the air inlet (3). Multiple guide grooves (5) are provided inside the housing (1); A heat exchange assembly is installed in the guide groove (5) for performing heat exchange operations; A fixing component is installed on the heat exchange component for installing the heat exchange component into the housing (1).

2. The supercritical flue gas heat exchanger that is easy to clean as described in claim 1, characterized in that: The heat exchange assembly includes: A frame (6) inserted into one or more of the guide slots (5); A plug-in handle (7) is installed on one side of the frame (6), and a heat exchange tube (8) is fixedly connected inside the frame (6). One end of the heat exchange tube (8) is equipped with a liquid inlet (13), and the other end of the heat exchange tube (8) is equipped with a liquid outlet (14).

3. A supercritical flue gas heat exchanger that is easy to clean as described in claim 2, characterized in that: A liquid supply side plate (15) is installed on the side of the box (1) away from the mounting hole (2); The liquid supply side plate (15) is equipped with a liquid supply pipe (9) and a liquid return pipe (10) on its top, and a liquid supply channel (11) and a liquid return channel (12) are installed inside the liquid supply side plate (15). The liquid supply channel (11) and the liquid return channel (12) are both connected to the liquid supply pipe (9) and the liquid return pipe (10).

4. A supercritical flue gas heat exchanger that is easy to clean as described in claim 3, characterized in that: The inlet end (13) and the outlet end (14) are respectively connected to the supply channel (11) and the return channel (12).

5. A supercritical flue gas heat exchanger that is easy to clean as described in claim 2, characterized in that: The fixing component includes: Two first fixing plates (24) are fixedly connected to the side wall of the frame (6), and multiple slide rails (16) aligned with the frame (6) are fixedly connected to the top and bottom of the box (1).

6. A supercritical flue gas heat exchanger that is easy to clean as described in claim 5, characterized in that: The slide rail (16) is slidably connected to the first slider (17). A spring (18) is fixedly connected between the first slider (17) and the slide rail (16), and a first fixing bracket (19) is fixedly connected to the first slider (17). A fixing rod (20) is fixedly connected inside the first fixing frame (19); A sleeve (21) is rotatably connected to the fixed rod (20), and a threaded rod (22) that can be inserted into the first fixed plate (24) is fixedly connected to the sleeve (21).

7. A supercritical flue gas heat exchanger that is easy to clean as described in claim 6, characterized in that: A nut (23) is threadedly connected to the threaded rod (22), and one side of the nut (23) is attached to the first fixing plate (24).

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