A boiler flue gas waste heat recovery device

Abstract

The utility model discloses a boiler flue gas waste heat recovery device belongs to flue gas recovery technical field, including heat exchange box, both ends of heat exchange box all are fixedly connected with the connecting pipe, one connecting pipe is connected with boiler exhaust port, the heat exchange box inside fixedly connected with heat pipe, heat pipe one end is connected with the water inlet, this application is provided with the mechanism of dismantling and changing, can make two limit blocks one end from the through -hole of fixed frame inside draw out through the rotation gear, at this moment can drive mounting frame and filter screen from the connecting pipe inside draw out, then fast to filter screen carries out cleaning or replacement, and after replacement is finished, can be through locking spare to carry out the location of knob and limit fixed, avoid in the use process knob rotation loses the location of filter screen, in this way need not to disassemble a plurality of connecting pieces, can fastly realize the dismantling and changing of filter screen, reduce the device downtime, guarantee the stability of waste heat recovery efficiency.

Description

Technical Field

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

[0002] Boilers, as core equipment for energy conversion, are widely used in industrial fields such as power, chemical, and metallurgy, as well as in residential heating scenarios. During this process, the combustion of fuel generates a large amount of boiler flue gas. Generally speaking, the temperature of the flue gas discharged from the boiler can reach 150-350℃. It not only carries a large amount of heat energy, but if it is directly discharged, the harmful components it contains and the high temperature will also cause thermal pollution and air pollution to the environment, while leading to the unnecessary waste of energy.

[0003] Given the current energy shortage and increasingly stringent environmental protection requirements, directly discharging high-temperature boiler flue gas is no longer in line with the development concept of energy conservation and emission reduction, and will also increase the energy consumption costs of enterprises. In order to achieve efficient energy utilization and environmental protection goals, flue gas waste heat recovery has become a key link in boiler system optimization. By adopting specific waste heat recovery devices, the heat energy in the flue gas can be captured and converted, which can not only reduce the boiler's fuel consumption and improve energy utilization efficiency, but also reduce the exhaust temperature and reduce the damage of high-temperature flue gas to subsequent exhaust equipment.

[0004] In practical applications, to prevent dust particles and other impurities in the flue gas from adhering to the surface of the core components of waste heat recovery, a filter screen is usually installed in the flue gas inlet pipe to pre-treat the flue gas and intercept particulate impurities. However, as the device operates for a long time, the mesh of the filter screen will gradually become clogged by the trapped particulate impurities. At this time, the filter screen needs to be replaced. However, the commonly used filter screen installation structure mostly adopts bolt fixing, flange connection and other methods. When replacing, multiple connecting parts need to be disassembled, the operation process is cumbersome, consumes a lot of manpower and time, and requires a long time to stop the operation of the device, which further aggravates energy waste and production efficiency loss. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by providing a boiler flue gas waste heat recovery device, so as to achieve rapid replacement of filter screens, reduce device downtime, and ensure stable waste heat recovery efficiency. To further achieve the above objectives, the following technical solution is adopted: A boiler flue gas waste heat recovery device includes a heat exchange box, with connecting pipes fixedly connected to both ends of the heat exchange box. One of the connecting pipes is connected to the boiler exhaust port. A heat-conducting pipe is fixedly connected inside the heat exchange box. One end of the heat-conducting pipe is connected to a water inlet, and the other end of the heat-conducting pipe is connected to a boiler water tank. Multiple filter screens are installed inside both connecting pipes. Multiple installation ports are opened on the surface of both connecting pipes, and a replacement mechanism for replacing the filter screens is installed in each of the multiple installation ports.

[0006] Preferably, the replacement mechanism includes multiple mounting frames slidably disposed inside the connecting pipe, multiple filters being respectively snapped into the corresponding mounting frames, a fixing block being fixedly connected to the top of the multiple mounting frames, a limit block being symmetrically slidably connected inside the fixing block, a fixing frame being symmetrically fixedly connected to the top of the connecting pipe, and a through hole of the same size as the limit block being opened inside the fixing frame, one end of the limit block being able to be inserted into the through hole.

[0007] Preferably, a gear is rotatably connected inside the fixing block, and racks are fixedly connected to the opposite faces of the two limiting blocks. Both racks are meshed with the gear. A knob is rotatably connected to one side of the fixing block. One end of the knob is fixedly connected to the gear through a connecting shaft, and a locking element is provided on the outer wall of the knob.

[0008] Preferably, a sealing strip is fixedly connected to the top of the mounting frame, and a sealing groove matching the sealing strip is opened on the surface of the mounting opening.

[0009] Preferably, the locking component includes a connecting block fixedly connected to the outer wall of the knob, a connecting plate slidably connected inside the connecting block, a limiting rod fixedly connected to one side of the connecting plate, the limiting rod passing through one end of the connecting block and located outside it, and a plurality of limiting grooves formed on one side of the fixed block with the knob as the center, one end of the limiting rod being inserted into a single limiting groove.

[0010] Preferably, one end of the connecting block is threadedly connected to a lead screw, the end of the lead screw inside the connecting block is threadedly connected to one side of the connecting plate, the end of the lead screw outside the connecting block is fixedly connected to a handle, a slider is fixedly connected to the bottom of the connecting plate, a groove is formed on the bottom surface inside the connecting block, and the slider is slidably connected in the groove.

[0011] Preferably, the heat pipe is arranged in an S-shape. Beneficial effects

[0012] This application includes a replacement mechanism. By rotating the gear, one end of each of the two limiting blocks can be pulled out from the through hole inside the fixing frame. This allows the mounting frame and filter screen to be pulled out from the connecting pipe, enabling quick cleaning or replacement of the filter screen. After replacement, the position of the knob can be limited and fixed by the locking component to prevent the knob from losing its limiting position on the filter screen during use. This allows for quick replacement of the filter screen without disassembling multiple connecting parts, reducing downtime and ensuring stable waste heat recovery efficiency.

[0013] This application includes a locking mechanism. After the filter screen is quickly installed, the knob rotation can be stopped and the handle can be rotated in the opposite direction to push the connecting plate and the limiting rod forward. This allows one end of the limiting rod to enter one of the limiting grooves. The self-locking capability of the screw rod limits and fixes the position of the knob, preventing the knob from losing its limiting effect on the filter screen during use. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the connection structure of the filter screen in this utility model; Figure 4 This is a three-dimensional structural diagram of the replacement mechanism in this utility model; Figure 5 for Figure 3 Enlarged view of point A in the middle; Figure 6 This is a three-dimensional structural diagram of the locking component in this utility model.

[0015] In the diagram: 1. Heat exchanger box; 2. Connecting pipe; 3. Heat conduction pipe; 4. Filter screen; 7. Mounting frame; 8. Fixing block; 9. Limiting block; 10. Fixing bracket; 11. Rack; 12. Gear; 13. Knob; 14. Sealing strip; 15. Sealing groove; 16. Connecting block; 17. Connecting plate; 18. Limiting rod; 19. Limiting groove; 20. Lead screw; 21. Handle; 22. Slider; 23. Slide groove. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Please see Figure 1-6As shown, a boiler flue gas waste heat recovery device includes a heat exchange box 1. Both ends of the heat exchange box 1 are fixedly connected to connecting pipes 2. One of the connecting pipes 2 is connected to the boiler exhaust port. A heat-conducting pipe 3 is fixedly connected inside the heat exchange box 1. One end of the heat-conducting pipe 3 is connected to the water inlet, and the other end of the heat-conducting pipe 3 is connected to the boiler water tank. Multiple filter screens 4 are provided inside both connecting pipes 2. Multiple installation ports are opened on the surface of both connecting pipes 2. Replacement mechanisms for replacing filter screens 4 are installed in the multiple installation ports. The heat-conducting pipe 3 is arranged in an S-shape.

[0017] During operation, the high-temperature flue gas generated by the boiler enters the heat exchange box 1 through the connecting pipe 2. At this time, cold water is transported to the heat-conducting pipe 3 through the water inlet. When the high-temperature flue gas is inside the heat exchange box 1, it will come into contact with the outer wall of the heat-conducting pipe 3. Through the heat conduction effect of the heat-conducting pipe 3, the heat in the high-temperature flue gas can be absorbed, thereby heating the cold water inside the heat-conducting pipe 3. The heated water will then flow back into the boiler, thus realizing the recovery and utilization of the waste heat of the flue gas and avoiding waste caused by direct discharge. At the same time, the heat-conducting pipe 3 is S-shaped, which can effectively extend the residence time of the water in the heat-conducting pipe 3, allowing the heat-conducting pipe 3 to absorb the heat in the flue gas more fully, thereby heating the cold water inside the pipe more thoroughly, improving the overall waste heat recovery efficiency, and reducing energy waste. Secondly, when boiler flue gas enters the heat exchange box 1 through connecting pipe 2, it will be filtered first through multiple filter screens 4 inside connecting pipe 2 to pre-treat the flue gas and intercept internal particulate impurities. When the surface of filter screen 4 becomes clogged after long-term use, the flue gas supply can be shut off, and then the replacement mechanism can be pulled to quickly remove and replace the filter screen 4. After replacement, it can be reinserted into the installation port, and the position of filter screen 4 can be locked by the replacement mechanism. Then, the equipment can be started to operate normally. In this way, the filter screen 4 can be quickly replaced without disassembling multiple connecting parts, reducing downtime and ensuring stable waste heat recovery efficiency. Reference Figure 2 , Figure 3 , Figure 4 and Figure 5 The replacement mechanism includes multiple mounting frames 7 that are slidably disposed inside the connecting pipe 2. Multiple filter screens 4 are respectively snapped into the corresponding mounting frames 7. Fixed blocks 8 are fixedly connected to the top of the multiple mounting frames 7. Limiting blocks 9 are symmetrically slidably connected inside the fixed blocks 8. Fixed frames 10 are symmetrically fixedly connected to the top of the connecting pipe 2. The fixed frames 10 have through holes with the same size as the limiting blocks 9 inside. One end of the limiting blocks 9 can be inserted into the through holes. Gear 12 is rotatably connected inside the fixing block 8. Two limit blocks 9 are fixedly connected to racks 11 on opposite sides. Both racks 11 are meshed with gear 12. A knob 13 is rotatably connected to one side of the fixing block 8. One end of the knob 13 is fixedly connected to gear 12 through a connecting shaft. A locking element is provided on the outer wall of the knob 13. A sealing strip 14 is fixedly connected to the top of the mounting frame 7. A sealing groove 15 matching the sealing strip 14 is opened on the surface of the mounting opening.

[0018] In use, first open the locking mechanism, then turn the knob 13 to rotate the gear 12. Since the gear 12 meshes with the two racks 11, the rotation of the gear 12 will drive the two racks 11 to push the two limiting blocks 9 closer together inside the fixing block 8, so that one end of the two limiting blocks 9 can be pulled out from the through hole inside the fixing frame 10. At this time, the fixing block 8 can be pulled to pull the mounting frame 7 and the filter screen 4 out from the inside of the connecting pipe 2. Then, the filter screen 4 can be quickly cleaned or replaced. After the filter screen 4 has been cleaned or replaced, the mounting frame 7 can be reinserted into the inside of the connecting pipe 2 through the mounting port, and the sealing strip 14 can be inserted into the sealing groove 15 to achieve a seal and prevent smoke leakage. Then, the knob 13 can be turned in the opposite direction to rotate the gear 12, and the racks 11 will drive the two limiting blocks 9 away from each other, so that one end of the two limiting blocks 9 can be reinserted into the through hole inside the fixing frame 10, thereby quickly installing the mounting frame 7 and the filter screen 4.

[0019] Reference Figure 4 and Figure 6 The locking component includes a connecting block 16 fixedly connected to the outer wall of the knob 13. A connecting plate 17 is slidably connected inside the connecting block 16. A limiting rod 18 is fixedly connected to one side of the connecting plate 17. The limiting rod 18 can pass through the connecting block 16 and is located on its outer side. A plurality of limiting grooves 19 are opened on one side of the fixed block 8 with the knob 13 as the center. One end of the limiting rod 18 can be inserted into a single limiting groove 19. A lead screw 20 is threadedly connected to one end of the connecting block 16. The end of the lead screw 20 located inside the connecting block 16 is threadedly connected to one side of the connecting plate 17. A handle 21 is fixedly connected to the end of the lead screw 20 located outside the connecting block 16. A slider 22 is fixedly connected to the bottom of the connecting plate 17. A sliding groove 23 is opened on the bottom surface inside the connecting block 16. The slider 22 is slidably connected in the sliding groove 23.

[0020] In use, firstly, turn the handle 21 to drive the lead screw 20 to rotate, allowing the lead screw 20 to move inside the connecting block 16. At this time, the movement of the lead screw 20 will pull the connecting plate 17 according to the guide of the slider 22 and the slide groove 23, causing the limiting rod 18 to be pulled out from one of the limiting grooves 19, thereby releasing the limiting fixation of the knob 13. After the filter screen 4 is quickly installed, stop the knob 13 from rotating and turn the handle 21 in the opposite direction to push the connecting plate 17 and the limiting rod 18 forward, so that one end of the limiting rod 18 enters one of the limiting grooves 19. Through the self-locking ability of the lead screw 20, the position of the knob 13 is limited and fixed, preventing the knob 13 from losing its limiting effect on the filter screen 4 during use.

[0021] As a technical optimization of this utility model: the high-temperature flue gas generated by the boiler enters the interior of the heat exchange box 1 through the connecting pipe 2. At this time, cold water can be transported to the interior of the heat-conducting pipe 3 through the water inlet. When the high-temperature flue gas is inside the heat exchange box 1, it will come into contact with the outer wall of the heat-conducting pipe 3. The heat conduction effect of the heat-conducting pipe 3 can absorb the heat in the high-temperature flue gas, thereby heating the cold water inside the heat-conducting pipe 3. The heated water will continue to flow into the boiler, thereby realizing the recovery and utilization of the waste heat of the flue gas and avoiding direct discharge and waste. Secondly, when the boiler flue gas enters the heat exchange box 1 through the connecting pipe 2, it will be filtered first through multiple filter screens 4 inside the connecting pipe 2 to pre-treat the flue gas and intercept internal particulate impurities. When the surface of the filter screens 4 becomes clogged after long-term use, the flue gas delivery can be shut off. Then, turn the handle 21 to drive the lead screw 20 to rotate, so that the lead screw 20 can move inside the connecting block 16. At this time, the movement of the lead screw 20 will pull the connecting plate 17 according to the guidance of the slider 22 and the slide groove 23. The limiting rod 18 is pulled out from one of the limiting grooves 19 to release the limiting fixation of the knob 13. Then, rotating the knob 13 drives the gear 12 to rotate. Since the gear 12 meshes with the two racks 11, the rotation of the gear 12 will drive the two racks 11 to push the two limiting blocks 9 closer to each other inside the fixing block 8, so that one end of the two limiting blocks 9 can be pulled out from the through hole inside the fixing frame 10. At this time, the fixing block 8 can be pulled to pull the mounting frame 7 and the filter screen 4 out from inside the connecting pipe 2. The filter screen 4 can be quickly cleaned or replaced. After cleaning or replacement, the mounting frame 7 can be reinserted into the connecting pipe 2 through the mounting port, and the sealing strip 14 can be inserted into the sealing groove 15 to achieve a seal and prevent flue gas leakage. Then, the knob 13 can be rotated in the reverse direction to drive the gear 12 to rotate. The rack 11 drives the two limit blocks 9 to move away from each other, so that one end of the two limit blocks 9 can be reinserted into the through hole inside the fixing frame 10. Then, the knob 13 is stopped and the handle 21 is rotated in the reverse direction to push the connecting plate 17 and the limit rod 18 forward, so that one end of the limit rod 18 enters one of the limit grooves 19. The self-locking ability of the screw 20 limits and fixes the position of the knob 13, preventing the knob 13 from losing its limit on the filter screen 4 during use. This allows for the quick installation of the mounting frame 7 and the filter screen 4. Then, the equipment can be started and operated normally. This allows for the quick replacement of the filter screen 4 without disassembling multiple connecting parts, reducing downtime and ensuring stable waste heat recovery efficiency.

[0022] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0023] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A boiler flue gas waste heat recovery device, comprising a heat exchange box (1), characterized in that: Both ends of the heat exchange box (1) are fixedly connected to connecting pipes (2). One of the connecting pipes (2) is connected to the boiler exhaust port. A heat-conducting pipe (3) is fixedly connected inside the heat exchange box (1). One end of the heat-conducting pipe (3) is connected to the water inlet, and the other end of the heat-conducting pipe (3) is connected to the boiler water tank. Multiple filter screens (4) are provided inside both connecting pipes (2). Multiple installation ports are opened on the surface of both connecting pipes (2). Replacement mechanisms for replacing filter screens (4) are installed in the multiple installation ports.

2. The boiler flue gas waste heat recovery device as described in claim 1, characterized in that: The replacement mechanism includes multiple mounting frames (7) that are slidably disposed inside the connecting pipe (2). Multiple filters (4) are respectively snapped into the corresponding mounting frames (7). Fixed blocks (8) are fixedly connected to the top of the multiple mounting frames (7). Limiting blocks (9) are symmetrically slidably connected inside the fixing blocks (8). Fixed frames (10) are symmetrically fixedly connected to the top of the connecting pipe (2). A through hole of the same size as the limiting block (9) is opened inside the fixed frame (10). One end of the limiting block (9) can be inserted into the through hole.

3. The boiler flue gas waste heat recovery device as described in claim 2, characterized in that: The fixing block (8) is rotatably connected to a gear (12), and the two limiting blocks (9) are fixedly connected to each other with racks (11). Both racks (11) are meshed with the gears (12). A knob (13) is rotatably connected to one side of the fixing block (8). One end of the knob (13) is fixedly connected to the gear (12) through a connecting shaft. A locking element is provided on the outer wall of the knob (13).

4. The boiler flue gas waste heat recovery device as described in claim 2, characterized in that: A sealing strip (14) is fixedly connected to the top of the mounting frame (7), and a sealing groove (15) matching the sealing strip (14) is opened on the surface of the mounting port.

5. A boiler flue gas waste heat recovery device as described in claim 3, characterized in that: The locking component includes a connecting block (16) fixedly connected to the outer wall of the knob (13). A connecting plate (17) is slidably connected inside the connecting block (16). A limiting rod (18) is fixedly connected to one side of the connecting plate (17). One end of the limiting rod (18) can pass through the connecting block (16) and is located outside it. A plurality of limiting grooves (19) are opened on one side of the fixing block (8) with the knob (13) as the center. One end of the limiting rod (18) can be inserted into a single limiting groove (19).

6. The boiler flue gas waste heat recovery device as described in claim 5, characterized in that: One end of the connecting block (16) is threadedly connected to a lead screw (20). The end of the lead screw (20) inside the connecting block (16) is threadedly connected to one side of the connecting plate (17). The end of the lead screw (20) outside the connecting block (16) is fixedly connected to a handle (21). The bottom of the connecting plate (17) is fixedly connected to a slider (22). The bottom surface inside the connecting block (16) is provided with a sliding groove (23). The slider (22) is slidably connected in the sliding groove (23).

7. The boiler flue gas waste heat recovery device as described in claim 1, characterized in that: The heat pipe (3) is arranged in an S-shape.

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