Flue gas waste heat recovery heat exchanger

Abstract

The utility model relates to the technical field of flue gas waste heat recovery, in particular to a flue gas waste heat recovery heat exchanger which comprises a heat exchange box, a plurality of heat exchange bent pipes distributed front and back are arranged in the heat exchange box, and the left end and the right end of the heat exchange box are fixedly connected with flue gas boxes. The two ends of each heat exchange bent pipe penetrate through the left side and the right side of the inner wall of the heat exchange box correspondingly and communicate with the two smoke boxes, and a dust removal box is arranged on the left portion of the smoke box on the left side. An extrusion disc is rotated to the opposite side, then a third fixing frame and a mounting frame can be sequentially taken out, then a second fixing frame is taken out, and then a first filter screen, a second filter screen and a third filter screen can be cleaned correspondingly, so that the aim of conveniently disassembling, assembling and cleaning the flue gas is further achieved, and the flue gas enters the left flue gas box through an L-shaped pipe; and the smoke enters the multiple heat exchange bent pipes respectively, and then water in the heat exchange box is heated to a certain temperature, so that the purpose of preventing dust in the smoke from blocking the multiple heat exchange bent pipes is achieved.

Description

Technical Field

[0001] This utility model relates to the field of flue gas waste heat recovery technology, specifically a flue gas waste heat recovery heat exchanger. Background Technology

[0002] Due to energy shortages, and with the further development of energy conservation efforts, various new and energy-efficient advanced furnace types are becoming increasingly sophisticated. The use of new refractory fibers and other high-quality insulation materials has significantly reduced heat loss from furnaces. However, the technology for reducing flue gas heat loss and recovering waste heat from flue gas is still not progressing rapidly. In order to further improve the thermal efficiency of kilns and achieve the goal of energy conservation and consumption reduction, recovering waste heat from flue gas is also an important way to save energy. Waste heat recovery from flue gas mainly involves converting the heat carried by the flue gas into usable heat through some heat exchange method.

[0003] A flue gas waste heat recovery heat exchanger, disclosed in Chinese Patent No. CN219223421U, first injects water into the recovery tank through the inlet pipe. Flue gas enters the heat exchange tube from the flue gas inlet. The hot flue gas flows in the heat exchange tube, transferring heat to the water and heating it. After the water reaches a certain temperature, it is discharged from the outlet pipe for reuse. Water is then injected into the recovery tank again, causing the water to circulate and become hot. The cooled flue gas enters the dust removal box, where the filter screen removes the dust. It then enters the purification tank, where a chemical reaction liquid is added through the outlet pipe. The motor is started, and the motor output rotates, causing the rotating rod and stirring rod to rotate, fully mixing and reacting the metallic substances and chemical reaction liquid in the flue gas. The mixture is then discharged through the outlet pipe, and the used reaction liquid is discharged through the liquid outlet pipe.

[0004] The shortcomings of the aforementioned flue gas waste heat recovery heat exchanger are that, since the flue gas is only filtered through the filter screen after it is discharged from inside the heat exchange tube, the dust in the flue gas will adhere to the inner wall of the heat exchange tube over time, thus clogging the heat exchange tube. Furthermore, since multiple filter screens are fixedly connected to the inner side wall of the dust collection box, it is inconvenient to disassemble and clean multiple filter screens. Therefore, it is necessary to propose a flue gas waste heat recovery heat exchanger to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a flue gas waste heat recovery heat exchanger, which has the characteristics of preventing dust in the flue gas from clogging multiple heat exchange bends, and facilitating the disassembly and cleaning of the first filter screen, the second filter screen and the third filter screen.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a flue gas waste heat recovery heat exchanger, including a heat exchange box, wherein multiple heat exchange bends are arranged inside the heat exchange box, and flue gas boxes are fixedly connected to both ends of the heat exchange box. The two ends of the multiple heat exchange bends pass through the left and right sides of the inner wall of the heat exchange box and are connected to the two flue gas boxes. A dust removal box is arranged to the left of the left flue gas box, and the left flue gas box and the dust removal box are connected by an L-shaped pipe.

[0007] A hollow plate is fixedly connected to the inner wall of the dust collector. A first rectangular sealing gasket is installed at the upper end of the hollow plate. An installation frame that presses against the first rectangular sealing gasket is inserted into the inside of the dust collector. A first fixing frame is fixedly connected inside the installation frame. A first filter screen is installed inside the first fixing frame. A second rectangular sealing gasket is installed at the upper end of the first fixing frame. A second fixing frame that presses against the second rectangular sealing gasket is inserted into the installation frame. A second filter screen is installed inside the second fixing frame. A third rectangular sealing gasket is installed at the upper end of the second fixing frame. A cover plate is inserted into the inside of the dust collector. Two connecting rods are fixedly connected to the lower end of the cover plate. A third fixing frame that presses against the third rectangular sealing gasket is fixedly connected to the lower end of the two connecting rods. A third filter screen is installed inside the third fixing frame.

[0008] A horizontal plate is provided at the right end of the dust collection box. A rotating shaft is rotatably connected to the upper end of the horizontal plate. A movable plate is fixedly connected to the upper end of the rotating shaft. A screw is threaded through and connected to the upper end of the movable plate. A pressing disc that presses against the upper end of the cover plate is fixedly connected to the lower end of the screw.

[0009] To prevent flue gas from overflowing from the cover plate, in a preferred embodiment of the flue gas waste heat recovery heat exchanger of this utility model, the outer wall of the cover plate is fitted with a sealing ring that presses against the inner wall of the dust collector through a groove.

[0010] To facilitate the entry of flue gas into the dust collector, as a preferred embodiment of the flue gas waste heat recovery heat exchanger of this utility model, the left end of the dust collector is connected to a flue gas inlet.

[0011] To facilitate the smooth entry of the sealing ring into the dust collector, as a preferred embodiment of the flue gas waste heat recovery heat exchanger of this utility model, the corner at the upper end of the inner wall of the dust collector is provided with an arc corner.

[0012] To facilitate operation by staff, a preferred embodiment of the flue gas waste heat recovery heat exchanger of this utility model is provided with handles on both the left and right sides of the upper end of the mounting frame and the cover plate.

[0013] To facilitate the rotation of the screw, a handwheel is preferably fixedly connected to the upper end of the screw in a preferred embodiment of the flue gas waste heat recovery heat exchanger of this utility model.

[0014] To facilitate the reinforcement of the heat exchange box, in a preferred embodiment of the flue gas waste heat recovery heat exchanger of this utility model, the horizontal plate is fixedly connected to the heat exchange box by a connecting block.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] Insert the second fixing frame into the interior of the mounting frame until the second fixing frame contacts the second rectangular sealing gasket. Then insert the mounting frame into the interior of the dust collector until the mounting frame contacts the first rectangular sealing gasket. Then insert the third fixing frame, the two connecting rods, and the cover plate into the interior of the dust collector until the third fixing frame contacts the third rectangular sealing gasket. Then rotate the extrusion plate to the top of the cover plate and apply downward pressure to the cover plate. Further press the third rectangular sealing gasket tightly through the third fixing frame, press the second rectangular sealing gasket tightly through the second fixing frame, and press the first rectangular sealing gasket tightly through the mounting frame. Thus, during operation, the flue gas can pass through the third filter screen, the second filter screen, and the first filter screen in sequence, and then enter the interior of the left flue gas box through the L-shaped pipe.

[0017] When removing the first, second, and third filters, simply reverse the steps to move the extrusion plate upwards and position it above the dust collector. Then rotate the extrusion plate to the opposite side, and the third fixing frame and mounting frame can be removed in sequence, followed by the removal of the second fixing frame. The first, second, and third filters can then be cleaned separately, further facilitating their disassembly and cleaning.

[0018] During operation, the flue gas enters the dust collection box and is filtered by the first, second, and third filters to remove dust. The flue gas then enters the left flue gas box through the L-shaped pipe and enters multiple heat exchange bends. The water inside the heat exchange box is then heated to a certain temperature to prevent dust in the flue gas from clogging the multiple heat exchange bends. Attached Figure Description

[0019] Figure 1 This is a front sectional view of the present invention.

[0020] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 This is a right-side cross-sectional view of the dust collector box of this utility model;

[0022] Figure 4 This is a structural diagram of the flue gas box of this utility model.

[0023] In the diagram: 1. Heat exchanger box; 2. Flue gas box; 3. Heat exchanger bend; 4. Dust collector box; 5. L-shaped pipe; 6. Inlet chimney; 7. Hollow plate; 8. First rectangular sealing gasket; 9. Mounting frame; 10. First fixing frame; 11. First filter screen; 12. Second rectangular sealing gasket; 13. Second fixing frame; 14. Second filter screen; 15. Third rectangular sealing gasket; 16. Third fixing frame; 17. Third filter screen; 18. Cover plate; 19. Connecting rod; 20. Horizontal plate; 21. Rotating shaft; 22. Movable plate; 23. Screw; 24. Extrusion plate; 25. Sealing ring; 26. Handwheel. Detailed Implementation

[0024] Please see Figures 1 to 4 A flue gas waste heat recovery heat exchanger includes a heat exchange box 1. The heat exchange box 1 is provided with multiple heat exchange bends 3 arranged front and back. Flue gas boxes 2 are fixedly connected to both ends of the heat exchange box 1. The two ends of the multiple heat exchange bends 3 pass through the left and right sides of the inner wall of the heat exchange box 1 and are connected to the two flue gas boxes 2. A dust removal box 4 is provided to the left of the left flue gas box 2. The left flue gas box 2 and the dust removal box 4 are connected by an L-shaped pipe 5.

[0025] A hollow plate 7 is fixedly connected to the inner wall of the dust collector 4. A first rectangular sealing gasket 8 is installed at the upper end of the hollow plate 7. An installation frame 9 that is pressed against the first rectangular sealing gasket 8 is inserted into the interior of the dust collector 4. A first fixing frame 10 is fixedly connected inside the installation frame 9. A first filter screen 11 is installed inside the first fixing frame 10. A second rectangular sealing gasket 12 is installed at the upper end of the first fixing frame 10. A second fixing frame 13 that is pressed against the second rectangular sealing gasket 12 is inserted into the interior of the installation frame 9. A second filter screen 14 is installed inside the second fixing frame 13. A third rectangular sealing gasket 15 is installed at the upper end of the second fixing frame 13. A cover plate 18 is inserted into the interior of the dust collector 4. Two connecting rods 19 are fixedly connected to the lower end of the cover plate 18. A third fixing frame 16 that is pressed against the third rectangular sealing gasket 15 is fixedly connected to the lower end of the two connecting rods 19. A third filter screen 17 is installed inside the third fixing frame 16.

[0026] A horizontal plate 20 is provided at the right end of the dust collection box 4. A rotating shaft 21 is rotatably connected to the upper end of the horizontal plate 20. A movable plate 22 is fixedly connected to the upper end of the rotating shaft 21. A screw 23 is threaded through and connected to the upper end of the movable plate 22. A pressing disc 24 that presses against the upper end of the cover plate 18 is fixedly connected to the lower end of the screw 23.

[0027] In this embodiment: when installing the first filter screen 11, the second filter screen 14, and the third filter screen 17, firstly, the second fixing frame 13 is inserted into the interior of the mounting frame 9. Since the second fixing frame 13 matches the interior of the mounting frame 9, it prevents the second fixing frame 13 from moving until it contacts the second rectangular sealing gasket 12. Then, the mounting frame 9 is inserted into the interior of the dust collection box 4. Again, the mounting frame 9 matches the interior of the dust collection box 4, preventing horizontal movement until it contacts the first rectangular sealing gasket 8. Next, the third fixing frame 16, the two connecting rods 19, and the cover plate 18 are inserted into the interior of the dust collection box 4. At this time, the sealing ring 25 is pressed against the inner wall of the dust collection box 4 until the third fixing frame 16 contacts the third rectangular sealing gasket 15. At this point, the first filter screen 11, the second filter screen 14, and the third filter screen 17 are... 7 is located inside the dust collection box 4, which causes the movable plate 22 to rotate with the rotating shaft 21, and at the same time drives the screw 23 and the extrusion plate 24 to rotate until the extrusion plate 24 is directly above the cover plate 18. Then the screw 23 is rotated, which drives the extrusion plate 24 to move downward, thereby applying downward pressure to the cover plate 18. Furthermore, the third rectangular sealing gasket 15 can be pressed by the third fixed frame 16, and the second rectangular sealing gasket 12 can be pressed by the second fixed frame 13. Since the first fixed frame 10 is fixedly connected to the inside of the mounting frame 9, the first rectangular sealing gasket 8 can also be pressed by the mounting frame 9. Thus, through the sealing effect of the first rectangular sealing gasket 8, the second rectangular sealing gasket 12 and the third rectangular sealing gasket 15, the flue gas can pass through the third filter screen 17, the second filter screen 14 and the first filter screen 11 in sequence during operation, and then enter the inside of the left flue gas box 2 through the L-shaped pipe 5.

[0028] When it is necessary to remove the first filter screen 11, the second filter screen 14, and the third filter screen 17, simply reverse the steps to move the squeezing disc 24 upward and position it above the dust collection box 4, then rotate the squeezing disc 24 to the opposite side, and then the third fixing frame 16 and the mounting frame 9 can be removed in sequence, followed by the removal of the second fixing frame 13. Then the first filter screen 11, the second filter screen 14, and the third filter screen 17 can be cleaned respectively, further facilitating their disassembly and cleaning.

[0029] During operation, the flue gas enters the dust collection box 4 and is filtered by the first filter screen 11, the second filter screen 14 and the third filter screen 17. Then, the flue gas enters the flue gas box 2 on the left side through the L-shaped pipe 5 and enters the interior of multiple heat exchange bends 3. The water inside the heat exchange box 1 is then heated to a certain temperature to prevent the dust in the flue gas from clogging the multiple heat exchange bends 3.

[0030] As a technical optimization of this utility model, the outer wall of the cover plate 18 is fitted with a sealing ring 25 that is pressed against the inner wall of the dust collection box 4 through a groove.

[0031] In this embodiment, a sealing ring 25 is provided to prevent smoke from overflowing from the cover plate 18.

[0032] As a technical optimization of this utility model, the left end of the dust collector 4 is connected to the smoke inlet 6.

[0033] In this embodiment, a flue duct 6 is provided to facilitate the entry of flue gas into the dust collection box 4.

[0034] As a technical optimization of this utility model, a rounded corner is provided at the upper corner of the inner wall of the dust collector 4.

[0035] In this embodiment, a rounded corner is provided to facilitate the smooth entry of the sealing ring 25 into the dust collection box 4.

[0036] As a technical optimization of this utility model, handles are installed on both the left and right sides of the upper end of the mounting frame 9 and the cover plate 18.

[0037] In this embodiment, a handle is provided to facilitate operation by staff.

[0038] As a technical optimization of this utility model, a handwheel 26 is fixedly connected to the upper end of the screw 23.

[0039] In this embodiment, a handwheel 26 is provided to facilitate the rotation of the screw 23.

[0040] As a technical optimization of this utility model, the horizontal plate 20 and the heat exchange box 1 are fixedly connected by a connecting block.

[0041] In this embodiment, a connecting block is provided to reinforce the heat exchange box 1.

[0042] Working principle: When installing the first filter screen 11, the second filter screen 14, and the third filter screen 17, firstly, the second fixing frame 13 is inserted into the interior of the mounting frame 9. Since the second fixing frame 13 matches the interior of the mounting frame 9, it prevents movement until the second fixing frame 13 contacts the second rectangular sealing gasket 12. Then, the mounting frame 9 is inserted into the interior of the dust collector 4. Again, the mounting frame 9 matches the interior of the dust collector 4, preventing horizontal movement until it contacts the first rectangular sealing gasket 8. Next, the third fixing frame 16, the two connecting rods 19, and the cover plate 18 are inserted into the interior of the dust collector 4. At this point, the sealing ring 25 is pressed against the inner wall of the dust collector 4, preventing smoke from overflowing from the cover plate 18. This continues until the third fixing frame 16 contacts the third rectangular sealing gasket 15. At this point, the first filter screen 11, the second filter screen 14, and the third filter screen 17 are fully installed. The filter screen 17 is located inside the dust collection box 4, which causes the movable plate 22 to rotate with the rotating shaft 21, and at the same time drives the screw 23 and the extrusion plate 24 to rotate until the extrusion plate 24 is directly above the cover plate 18. Then, the screw 23 is rotated by the handwheel 26, which drives the extrusion plate 24 to move downward, thereby applying downward pressure to the cover plate 18. Furthermore, the third rectangular sealing gasket 15 can be pressed by the third fixed frame 16, and the second rectangular sealing gasket 12 can be pressed by the second fixed frame 13. Since the first fixed frame 10 is fixedly connected to the inside of the mounting frame 9, the first rectangular sealing gasket 8 can also be pressed by the mounting frame 9. Thus, through the sealing effect of the first rectangular sealing gasket 8, the second rectangular sealing gasket 12 and the third rectangular sealing gasket 15, the flue gas can pass through the third filter screen 17, the second filter screen 14 and the first filter screen 11 in sequence during operation, and then enter the inside of the left flue gas box 2 through the L-shaped pipe 5.

[0043] When it is necessary to remove the first filter screen 11, the second filter screen 14, and the third filter screen 17, simply reverse the steps to move the squeezing disc 24 upward and position it above the dust collection box 4, then rotate the squeezing disc 24 to the opposite side, and then the third fixing frame 16 and the mounting frame 9 can be removed in sequence, followed by the removal of the second fixing frame 13. Then the first filter screen 11, the second filter screen 14, and the third filter screen 17 can be cleaned respectively, further facilitating their disassembly and cleaning.

[0044] During operation, the flue gas enters the dust collector 4 through the flue gas inlet 6 and is filtered by the first filter screen 11, the second filter screen 14 and the third filter screen 17 to remove dust. Then, the flue gas enters the flue gas box 2 on the left through the L-shaped pipe 5 and enters the interior of multiple heat exchange bends 3. The water inside the heat exchange box 1 is then heated to a certain temperature to prevent the dust in the flue gas from clogging the multiple heat exchange bends 3.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flue gas waste heat recovery heat exchanger comprising a heat exchange box (1), the inside of the heat exchange box (1) is provided with a plurality of front and rear distributed heat exchange bends (3), characterized in that: The heat exchange box (1) is fixedly connected to the flue gas box (2) at both ends. The two ends of the multiple heat exchange bends (3) pass through the left and right sides of the inner wall of the heat exchange box (1) and are connected to the two flue gas boxes (2). A dust removal box (4) is set to the left of the left flue gas box (2). The left flue gas box (2) and the dust removal box (4) are connected by an L-shaped pipe (5). A hollow plate (7) is fixedly connected to the inner wall of the dust collector (4). A first rectangular sealing gasket (8) is installed at the upper end of the hollow plate (7). An installation frame (9) that is pressed against the first rectangular sealing gasket (8) is inserted into the interior of the dust collector (4). A first fixing frame (10) is fixedly connected inside the installation frame (9). A first filter screen (11) is installed inside the first fixing frame (10). A second rectangular sealing gasket (12) is installed at the upper end of the first fixing frame (10). An installation frame (9) that is pressed against the second rectangular sealing gasket (8) is inserted into the interior of the installation frame (9). 2) A second fixed frame (13) is pressed against each other. A second filter screen (14) is installed inside the second fixed frame (13). A third rectangular sealing gasket (15) is installed at the upper end of the second fixed frame (13). A cover plate (18) is inserted into the dust collection box (4). Two connecting rods (19) are fixedly connected to the lower end of the cover plate (18). A third fixed frame (16) is pressed against the third rectangular sealing gasket (15) at the lower end of the two connecting rods (19). A third filter screen (17) is installed inside the third fixed frame (16). A horizontal plate (20) is provided at the right end of the dust collection box (4). A rotating shaft (21) is rotatably connected to the upper end of the horizontal plate (20). A movable plate (22) is fixedly connected to the upper end of the rotating shaft (21). A screw (23) is threaded through and connected to the upper end of the movable plate (22). A pressing disc (24) that presses against the upper end of the cover plate (18) is fixedly connected to the lower end of the screw (23).

2. A flue gas heat recovery exchanger according to claim 1, characterised in that: The outer wall of the cover plate (18) is fitted with a sealing ring (25) that presses against the inner wall of the dust collection box (4) through a groove.

3. A flue gas heat recovery exchanger according to claim 1, characterised in that: The dust collector (4) is connected to the smoke inlet (6) through the left end.

4. The flue gas waste heat recovery heat exchanger according to claim 1, characterized in that: The dust collector (4) has a rounded corner at the upper corner of its inner wall.

5. A flue gas heat recovery exchanger according to claim 1, characterized in that: Handles are installed on both the left and right sides of the upper end of the mounting frame (9) and the cover plate (18).

6. A flue gas heat recovery exchanger according to claim 1, characterised in that: A handwheel (26) is fixedly connected to the upper end of the screw (23).

7. A flue gas heat recovery exchanger according to claim 1, characterised in that: The horizontal plate (20) is fixedly connected to the heat exchange box (1) by a connecting block.

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