A flue gas waste heat recovery device

Abstract

The utility model discloses a kind of flue gas waste heat recovery devices, it relates to flue gas waste heat recovery technical field, including heat exchange tank, fixedly installed with filter box on the left side shell of heat exchange tank, fixedly installed with flue gas inlet on the left side shell of filter box, bracket is welded on the bottom end of the both sides of heat exchange tank, plug-in slot is established in the top of filter box, filter frame is movably inserted in the inside of plug-in slot, locking hole is established in the top end of the front and rear two sides of filter frame. The utility model passes through setting filter frame, filter plate one and filter plate two in filter box, double filtration is carried out to flue gas, can effectively remove large particle impurities and small impurities in flue gas, reduce the adhesion of impurities on heat exchange pipe, avoid the influence of heat exchange effect due to dust accumulation or scale, filter frame uses the structure design of movable plug-in cooperation locking inclined block, convenient for quickly taking out filter frame to clean or replace filter plate, reduce maintenance cost and operation complexity.

Description

Technical Field

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

[0002] In industrial production and energy utilization processes, the combustion of large amounts of fuel or chemical reactions produces high-temperature flue gas. This flue gas contains abundant heat energy, and if it is directly emitted into the atmosphere, it will not only cause a huge waste of energy but also exacerbate environmental thermal pollution. Therefore, waste heat recovery treatment is carried out on it.

[0003] In the prior art, a Chinese patent document with publication number CN115900391A and publication date of April 4, 2023, was proposed to solve the above-mentioned technical problems. The technical solution disclosed in this patent document is as follows: a waste heat recovery device for high-temperature flue gas, including a flue gas inlet pipe and a flue gas outlet pipe, a main housing fixedly installed between the flue gas inlet pipe and the flue gas outlet pipe, a secondary housing fixedly installed on the top of the main housing, a dust collection box detachably installed on the bottom of the main housing, a heat exchange component movably installed inside the main housing, a fixing plate fixedly installed on the side of the main housing, a first electric cylinder fixedly installed on the top of the fixing plate, and the output end of the first electric cylinder fixedly connected to the side of the heat exchange component.

[0004] To address the issue of waste heat recovery from flue gas, existing technologies involve designing multiple heat exchange units in combination. These units can be arranged in overlapping or staggered configurations, allowing the gas ducts to be spiral-shaped during use for easy heat absorption and vertical for cleaning purposes. However, during heat exchange, impurities in the flue gas can adhere to the heat exchange tubes. If the inner wall of the heat exchange tubes is hardened, such as scale formed by high-temperature sintering, it will be difficult to remove completely, affecting the heat exchange efficiency of the heat exchange tubes. Summary of the Invention

[0005] The purpose of this invention is to provide a device for recovering waste heat from flue gas, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A waste heat recovery device for flue gas includes a heat exchange tank, a filter box is fixedly installed on the left side shell of the heat exchange tank, a flue gas inlet is fixedly installed on the left side shell of the filter box, and supports are welded to the bottom ends of both sides of the heat exchange tank.

[0007] The top of the filter box is provided with a plug-in slot, and a filter frame is movably plugged into the plug-in slot. Locking holes are provided at the top of the front and rear sides of the filter frame.

[0008] A further improvement of this utility model is that: a filter plate one is movably inserted into the front end of the filter frame, and a filter plate two is movably inserted into the rear end of the filter frame. Locking inclined blocks are provided on both the front and rear sides of the insertion groove at the front side of the top cavity. The filter plate one and the filter plate two perform dual filtration of the flue gas, which can effectively remove large and small impurities in the flue gas and reduce the adhesion of impurities on the heat exchange tube.

[0009] A further improvement of the present invention is that: limit blocks are fixedly installed on both sides of the locking inclined block, the limit blocks are slidably connected to the inner walls of both sides of the cavity, and a piston rod is fixedly installed at the rear end of the locking inclined block.

[0010] A further improvement of this utility model is that: the other end of the piston rod extends outside the housing of the filter box and is fixedly connected to a pull plate; a return spring is sleeved on the outer surface of the piston rod; one end of the return spring is fixedly installed at the rear end of the locking wedge; and the other end of the return spring is fixedly installed at the rear end of the cavity.

[0011] A further improvement of this utility model is that: an inlet is fixedly installed on the top of the heat exchange tank, an outlet is fixedly installed at the bottom of the heat exchange tank, and an exhaust port is fixedly installed on the right side shell of the heat exchange tank.

[0012] A further improvement of this utility model is that: a partition plate is fixedly installed at both the upper and lower ends of the inner wall of the heat exchange tank; a water guide cover one is fixedly installed inside the upper partition plate, and the input end of the water guide cover one is fixedly connected to the output end of the water inlet; a water guide cover two is fixedly installed inside the lower partition plate, and the output end of the water guide cover two is fixedly connected to the input end of the water outlet.

[0013] A further improvement of this utility model is that a heat exchange tube is fixedly installed at the input end of the second water guide cover, and the other end of the heat exchange tube is fixedly connected to the output end of the first water guide cover.

[0014] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows: This utility model provides a waste heat recovery device for flue gas. By setting a filter frame, filter plate one and filter plate two in the filter box to perform double filtration of flue gas, it can effectively remove large and small impurities in flue gas, reduce the adhesion of impurities on the heat exchange tube, and avoid the heat exchange effect being affected by ash accumulation or scale.

[0015] This utility model provides a waste heat recovery device for flue gas. The filter frame adopts a structure design with movable plug-in and locking inclined block, which makes it easy to quickly remove the filter frame to clean or replace the filter plate, reducing maintenance costs and operation complexity.

[0016] This utility model provides a device for recovering waste heat from flue gas. The heat exchange tank is equipped with a partition plate, a water guide shroud 1, and a water guide shroud 2. Cold water enters through the inlet and is evenly distributed to each heat exchange tube through the water guide shroud 1, allowing it to fully contact the high-temperature flue gas for heat exchange. The heated hot water is then collected through the water guide shroud 2 and discharged from the outlet, forming a complete and efficient heat exchange cycle, which improves the recovery and utilization rate of waste heat from flue gas. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional schematic diagram of the filter box structure of this utility model; Figure 3 This is a schematic diagram of the filter frame structure of this utility model; Figure 4 This is a schematic diagram of the locking inclined block structure of this utility model; Figure 5 This is a schematic cross-sectional view of the heat exchange tank structure of this utility model: Figure 6 This is a schematic diagram of the heat exchange tube structure of this utility model.

[0018] In the diagram: 1. Heat exchange tank; 11. Inlet; 12. Outlet; 13. Exhaust port; 14. Divider plate; 15. Water guide shroud one; 16. Water guide shroud two; 17. Heat exchange tube; 2. Filter box; 21. Insertion groove; 22. Filter frame; 23. Locking hole; 24. Filter plate one; 25. Filter plate two; 26. Locking inclined block; 27. Limiting block; 28. Piston rod; 29. ​​Pull plate; 210. Return spring; 3. Flue gas inlet; 4. Support. Detailed Implementation

[0019] 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. Example

[0020] like Figure 1-6As shown, this utility model provides a waste heat recovery device for flue gas, including a heat exchange tank 1. A filter box 2 is fixedly installed on the left side shell of the heat exchange tank 1. A flue gas inlet 3 is fixedly installed on the left side shell of the filter box 2. Supports 4 are welded to the bottom ends of both sides of the heat exchange tank 1. An insertion slot 21 is opened on the top of the filter box 2. A filter frame 22 is movably inserted into the insertion slot 21. Locking holes 23 are opened at the top ends of both the front and rear sides of the filter frame 22. A filter plate 24 is movably inserted into the front end of the filter frame 22. A filter plate 25 is movably inserted into the rear end of the filter frame 22.

[0021] Furthermore, the high-temperature flue gas enters the filter box 2 through the flue gas inlet 3. In the filter box 2, the flue gas first passes through the filter plate 24 and filter plate 25 in the filter frame 22. The filter plate 24 can filter out larger particles of impurities in the flue gas, while the filter plate 25 further filters out finer impurities, thereby reducing the impurity content in the flue gas that subsequently enters the heat exchange tank 1 and preventing impurities from adhering to the heat exchange tube 17 and affecting the heat exchange effect. Example

[0022] like Figure 1-6 As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, locking inclined blocks 26 are provided on both the front and rear sides of the insertion slot 21 at the front side of the top cavity. Limiting blocks 27 are fixedly installed on both sides of the locking inclined blocks 26. The limiting blocks 27 are slidably connected to the inner walls of both sides of the cavity. A piston rod 28 is fixedly installed at the rear end of the locking inclined block 26. The other end of the piston rod 28 extends to the outside of the housing of the filter box 2 and is fixedly connected to a pull plate 29. A return spring 210 is sleeved on the outer surface of the piston rod 28. One end of the return spring 210 is fixedly installed at the rear end of the locking inclined block 26, and the other end of the return spring 210 is fixedly installed at the rear end of the cavity.

[0023] Furthermore, when it is necessary to clean or replace the filter plates 24 and 25 inside the filter frame 22, pull the pull plate 29. The pull plate 29 drives the piston rod 28 to move backward, and the piston rod 28 pulls the locking block 26 to move backward. At this time, the return spring 210 is compressed, and the locking block 26 disengages from the locking hole 23 of the filter frame 22. The filter frame 22 can then be removed from the insertion slot 21, and the filter plates 24 and 25 can be cleaned. After the operation is completed, the filter frame 22 is reinserted into the insertion slot 21, the pull plate 29 is released, and under the elastic force of the return spring 210, the locking block 26 moves forward and engages with the locking hole 23, thus fixing the filter frame 22. Example

[0024] like Figure 1-6As shown, based on embodiments 1-2, this utility model provides a technical solution: Preferably, an inlet 11 is fixedly installed on the top of the heat exchange tank 1, an outlet 12 is fixedly installed at the bottom of the heat exchange tank 1, an exhaust port 13 is fixedly installed on the right side shell of the heat exchange tank 1, and partition plates 14 are fixedly installed at the upper and lower ends of the inner wall of the heat exchange tank 1. A water guide cover 15 is fixedly installed inside the upper partition plate 14, and the input end of the water guide cover 15 is fixedly connected to the output end of the inlet 11. A water guide cover 2 16 is fixedly installed inside the lower partition plate 14, and the output end of the water guide cover 2 16 is fixedly connected to the input end of the outlet 12. A heat exchange tube 17 is fixedly installed at the input end of the water guide cover 2 16, and the other end of the heat exchange tube 17 is fixedly connected to the output end of the water guide cover 15.

[0025] Furthermore, the filtered flue gas enters the heat exchange tank 1. At this time, cold water enters the water guide shroud 15 through the inlet 11. The water guide shroud 15 distributes the cold water evenly to each heat exchange tube 17. The cold water in the heat exchange tube 17 exchanges heat with the high-temperature flue gas in the heat exchange tank 1. The cold water absorbs the heat of the flue gas and its temperature rises. The hot water that has completed the heat exchange is collected through the water guide shroud 16 and then discharged from the outlet 12. It can be used for heating, production and other purposes. The flue gas that has lost a lot of heat is discharged through the exhaust port 13 on the right side of the heat exchange tank 1.

[0026] The working principle of this flue gas waste heat recovery device will be explained in detail below.

[0027] like Figure 1-6As shown, during operation, high-temperature flue gas enters the filter box 2 through the flue gas inlet 3. Inside the filter box 2, the flue gas first passes through filter plate 24 and filter plate 25 within the filter frame 22. Filter plate 24 filters out larger particles of impurities in the flue gas, while filter plate 25 further filters out smaller impurities. This reduces the impurity content in the flue gas subsequently entering the heat exchange tank 1, preventing impurities from adhering to the heat exchange tubes 17 and affecting the heat exchange effect. The filtered flue gas then enters the heat exchange tank 1. At this time, cold water enters the water guide shroud 15 through the inlet 11. The water guide shroud 15 evenly distributes the cold water to each heat exchange tube 17. The cold water in the heat exchange tubes 17 exchanges heat with the high-temperature flue gas in the heat exchange tank 1. The cold water absorbs heat from the flue gas, causing its temperature to rise. The hot water, having completed the heat exchange, is collected through the water guide shroud 16 and then flows out from the outlet 1. The exhaust gas, which has lost a lot of heat, is discharged through the exhaust port 13 on the right side of the heat exchange tank 1. When it is necessary to clean or replace the filter plate 24 and filter plate 25 in the filter frame 22, pull the pull plate 29. The pull plate 29 drives the piston rod 28 to move backward. The piston rod 28 pulls the locking wedge 26 to move backward. At this time, the return spring 210 is compressed, and the locking wedge 26 disengages from the locking hole 23 of the filter frame 22. The filter frame 22 can then be removed from the insertion slot 21, and the filter plate 24 and filter plate 25 can be cleaned. After the operation is completed, the filter frame 22 is reinserted into the insertion slot 21, the pull plate 29 is released, and under the elastic force of the return spring 210, the locking wedge 26 moves forward and locks into the locking hole 23, thus fixing the filter frame 22.

[0028] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A device for recovering waste heat from flue gas, comprising a heat exchange tank (1), characterized in that: A filter box (2) is fixedly installed on the left side shell of the heat exchange tank (1), and a flue gas inlet (3) is fixedly installed on the left side shell of the filter box (2). Brackets (4) are welded to the bottom of both sides of the heat exchange tank (1). The top of the filter box (2) is provided with a plug-in slot (21), and a filter frame (22) is movably plugged into the plug-in slot (21). Locking holes (23) are provided at the top of the front and rear sides of the filter frame (22). A filter plate 1 (24) is movably inserted into the front end of the filter frame (22), and a filter plate 2 (25) is movably inserted into the rear end of the filter frame (22). Locking inclined blocks (26) are provided on both the front and rear sides of the insertion groove (21) at the front side of the top cavity. The heat exchange tank (1) has partition plates (14) fixedly installed at the upper and lower ends of its inner wall. A water guide cover (15) is fixedly installed inside the upper partition plate (14). The input end of the water guide cover (15) is fixedly connected to the output end of the water inlet (11). A water guide cover (16) is fixedly installed inside the lower partition plate (14). The output end of the water guide cover (16) is fixedly connected to the input end of the water outlet (12).

2. The waste heat recovery device for flue gas according to claim 1, characterized in that: Limiting blocks (27) are fixedly installed on both sides of the locking wedge (26). The limiting blocks (27) are slidably connected to the inner walls of both sides of the cavity. A piston rod (28) is fixedly installed at the rear end of the locking wedge (26).

3. The waste heat recovery device for flue gas according to claim 2, characterized in that: The other end of the piston rod (28) extends outside the housing of the filter box (2) and is fixedly connected to a pull plate (29). A return spring (210) is sleeved on the outer surface of the piston rod (28). One end of the return spring (210) is fixedly installed at the rear end of the locking wedge (26), and the other end of the return spring (210) is fixedly installed at the rear end of the cavity.

4. The waste heat recovery device for flue gas according to claim 1, characterized in that: The heat exchange tank (1) has an inlet (11) fixedly installed on the top, an outlet (12) fixedly installed at the bottom, and an exhaust port (13) fixedly installed on the right side shell of the heat exchange tank (1).

5. The waste heat recovery device for flue gas according to claim 1, characterized in that: A heat exchange tube (17) is fixedly installed at the input end of the second water guide cover (16), and the other end of the heat exchange tube (17) is fixedly connected to the output end of the first water guide cover (15).

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