Heat exchanger for flue gas waste heat utilization

Abstract

The utility model relates to a heat exchanger for flue gas waste heat utilization, and relates to the technical field of heat exchangers, the heat exchanger comprises a flue gas pipe and a cold water pipe arranged in the flue gas pipe, the two ends of the cold water pipe are fixedly arranged on the side wall of the flue gas pipe in a penetrating mode, and a filter assembly is arranged at the gas inlet end of the flue gas pipe and comprises a filter screen plate and an impurity collecting plate; one side of the filter screen plate is hinged to the smoke pipe through a hinge shaft, the impurity collecting plate is bent to be in a circular arc shape and located on the side, away from the hinge shaft, of the filter screen plate, the impurity collecting plate is fixedly connected with the smoke pipe, and the side, away from the hinge shaft, of the filter screen plate is attached to the arc face of the impurity collecting plate and is in sliding connection with the impurity collecting plate. The flue gas heat exchanger has the effect that the heat exchange effect of flue gas and cold water is not easily reduced due to impurities.

Description

Technical Field

[0001] This application relates to the technical field of heat exchangers, and in particular to a heat exchanger for utilizing waste heat from flue gas. Background Art

[0002] A heat exchanger is a device used for heat exchange, and it is commonly used in convective heat transfer applications, especially in the utilization of waste heat from flue gas.

[0003] Chinese Patent Publication No. CN217541561U discloses a heat exchanger for efficient waste heat recovery from flue gas. It includes a cylindrical body and multiple tubes disposed within the cylindrical body. The cylindrical body is used to introduce flue gas, and the tubes are used to introduce cold water. Multiple surrounding fins are fitted onto the tubes to accelerate the absorption of gas temperature. Multiple baffles are installed inside the cylindrical body to prolong the contact time between the flue gas and the tubes. In use, the cold water exchanges heat with the flue gas through the tubes and surrounding fins, absorbing heat from the flue gas and converting it into hot water. The hot water then enters the heating pipes for heating purposes, thus realizing the utilization of waste heat from the flue gas.

[0004] In the above technical solution, although the waste heat of flue gas is utilized, the impurities carried in the flue gas can directly contact the tubes, making it easy for a layer of impurities to adhere to the tubes, thereby easily reducing the heat exchange effect between cold water and flue gas. Utility Model Content

[0005] In order to prevent the heat exchange efficiency between flue gas and cold water from being reduced by impurities, this application provides a heat exchanger for the utilization of waste heat from flue gas.

[0006] This application provides a heat exchanger for utilizing waste heat from flue gas, employing the following technical solution:

[0007] A heat exchanger for utilizing waste heat from flue gas includes a flue gas pipe and a cold water pipe installed inside the flue gas pipe. Both ends of the cold water pipe are fixedly installed on the side walls of the flue gas pipe. A filter assembly is installed at the inlet end of the flue gas pipe. The filter assembly includes a filter screen and a debris collection plate. One side of the filter screen is hinged to the flue gas pipe via a hinge shaft. The debris collection plate is curved into an arc shape and is located on the side of the filter screen away from the hinge shaft. The debris collection plate is fixedly connected to the flue gas pipe. The side of the filter screen away from the hinge shaft is in contact with the arc surface of the debris collection plate and is slidably connected to the debris collection plate.

[0008] By adopting the above technical solution, flue gas is introduced into the flue gas pipe and cold water is introduced into the cold water pipe. The cold water exchanges heat with the flue gas through the cold water pipe. When the flue gas enters the flue gas pipe, the filter screen plate filters the flue gas, removing impurities from the flue gas and causing them to fall onto the impurity collection plate. The filter screen plate swings back and forth, pushing the impurities out of the impurity collection plate, thus removing impurities from the flue gas. This makes it less likely for impurities to adhere to the cold water pipe when the flue gas comes into contact with it, thereby preventing the heat exchange effect between the flue gas and cold water from being reduced due to impurities.

[0009] Optionally, the hinge shaft is fixedly connected to the filter screen and rotatably connected to the flue pipe. A motor is provided at one end of the hinge shaft, and the motor is fixedly connected to the flue pipe. A first gear is coaxially fixedly connected to the output shaft of the motor. The first gear is an incomplete gear. A second gear is coaxially fixedly connected to the end of the hinge shaft near the motor. The first gear is used to mesh with the second gear.

[0010] By adopting the above technical solution, the first gear is driven to rotate by a motor, and the first gear intermittently drives the second gear to rotate. The second gear drives the filter screen to swing through the hinge shaft. Under the intermittent drive of the first gear and the gravity of the filter screen, the filter screen swings back and forth, making it easy to remove the filtered impurities.

[0011] Optionally, the bottom end of the collection plate is fixedly connected to a collection box with an opening at the top.

[0012] By adopting the above technical solution, the filter screen can push impurities into the collection box, so that the filtered impurities can be collected in a concentrated manner.

[0013] Optionally, a closing plate is slidably provided at the open end of the collection box, and a telescopic rod is provided between the closing plate and the hinge shaft. The telescopic rod is fixedly connected to the hinge shaft, and the movable end of the telescopic rod is hinged to the closing plate.

[0014] By adopting the above technical solution, the sealing plate can seal the collection box, so that the collected impurities are not easy to fall out of the collection box; when the hinge shaft drives the filter screen plate to turn to the collection box, the hinge shaft can simultaneously drive the telescopic rod to swing, and the telescopic rod can extend to drive the sealing plate to slide, so that the collection box can be opened. Thus, the filter screen plate can simultaneously open the collection box when pushing impurities, which makes it easier to collect impurities.

[0015] Optionally, the cold water pipe is arranged in a serpentine bend along the flue gas flow direction in the flue gas pipe, and multiple fins are fixed circumferentially on the part of the cold water pipe perpendicular to the flue gas flow direction. The fins are arranged along the water flow direction in the cold water pipe, and a gap is left between the fins and the side wall of the flue gas pipe.

[0016] By adopting the above technical solution, on the one hand, the fins increase the contact area between the cold water pipe and the flue gas, thereby improving the heat exchange efficiency; on the other hand, the fins restrict the flow of flue gas in the flue gas pipe, extending the contact time between the flue gas and the cold water pipe. Thus, by setting the fins, the heat exchange effect between the cold water and the flue gas is improved.

[0017] Optionally, the cold water pipe is connected to a scraping assembly, which includes scrapers. Multiple scrapers are provided, each corresponding to a portion of the cold water pipe perpendicular to the flue gas flow direction. The cold water pipe and the fins are slidably inserted through the scrapers.

[0018] By adopting the above technical solution, the sliding scraper can remove impurities attached to the cold water pipe and fins, thereby making it less likely for the heat exchange capacity of the cold water pipe and fins to decrease.

[0019] Optionally, two adjacent scrapers are fixedly connected by a connecting rod, and one of the scrapers is connected to an electric push rod. The electric push rod is fixed on the outer wall of the flue pipe, and the movable end of the electric push rod slides through the side wall of the flue pipe and is fixedly connected to the corresponding scraper.

[0020] By adopting the above technical solution, one scraper is driven to slide by an electric push rod, and all scrapers can slide synchronously through the connecting rod, so that all scrapers can synchronously clean the impurities on the cold water pipe and fins under the drive of the electric push rod.

[0021] Optionally, the bottom end of the flue pipe is provided with a discharge hole, and a discharge plate is adapted to cover the discharge hole, with one side of the discharge plate hinged to the flue pipe.

[0022] By adopting the above technical solution, rotating the waste removal plate can open the waste removal hole, making it easy to clean the impurities scraped off by the scraper from the waste removal hole, thus making it difficult for impurities to accumulate in the flue gas pipe.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By setting up filter screens and dust collection plates, impurities in the flue gas can be removed before they come into contact with the cold water pipe, so that the heat exchange efficiency between the flue gas and the cold water is not easily reduced due to impurities;

[0025] 2. By setting a motor, a first gear, and a second gear, the filter screen can swing back and forth, making it easier to remove impurities from the collection plate;

[0026] 3. By installing scrapers and electric push rods, impurities on the cold water pipes and fins can be easily removed. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the scraping component.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Flue pipe; 11. Exhaust hole; 12. Exhaust plate; 2. Cold water pipe; 21. Fin plate; 3. Filter assembly; 31. Filter screen; 311. Hinge shaft; 32. Collection plate; 33. Motor; 331. First gear; 34. Second gear; 35. Collection box; 36. Sealing plate; 37. Telescopic rod; 4. Scraper assembly; 41. Scraper; 411. Connecting rod; 42. Electric push rod. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0032] This application discloses a heat exchanger for utilizing waste heat from flue gas. (Refer to...) Figure 1 A heat exchanger for utilizing waste heat from flue gas includes a flue gas pipe 1 and a cold water pipe 2 installed inside the flue gas pipe 1. A filter assembly 3 is installed at the air inlet end of the flue gas pipe 1 to filter out impurities in the flue gas.

[0033] In use, flue gas is introduced into flue gas pipe 1 and cold water is introduced into cold water pipe 2. The filter component 3 filters out impurities in the flue gas. The flue gas enters flue gas pipe 1 and comes into contact with cold water pipe 2. The cold water exchanges heat with the flue gas through cold water pipe 2 to use the residual heat of the flue gas to heat the cold water, so that the heat exchange effect between the flue gas and cold water is not easily reduced by impurities.

[0034] Reference Figure 2 The flue gas pipe 1 is a rectangular tube and is set horizontally. The cold water pipe 2 is a rectangular tube and is set in a serpentine bend along the flue gas flow direction in the flue gas pipe 1. The cold water pipe 2 is set vertically as a whole, and both ends are fixedly inserted through the top of the flue gas pipe 1.

[0035] Reference Figure 1 The filter assembly 3 includes a filter screen 31 and a dust collection plate 32. The filter screen 31 is rectangular and is adapted to the end of the flue pipe 1. A hinge shaft 311 is fixedly connected to one side of the filter screen 31. The hinge shaft 311 is rotatably connected to the top end of the flue pipe 1. The filter screen 31 is hinged to the flue pipe 1 through the hinge shaft 311.

[0036] The collection plate 32 is rectangular and curved into an arc shape. The collection plate 32 is located on the side of the filter screen plate 31 away from the hinge shaft 311. The collection plate 32 is fixed to the bottom end of the flue gas pipe 1. The side of the filter screen plate 31 away from the hinge shaft 311 is attached to the arc surface of the collection plate 32 and is slidably connected to the collection plate 32.

[0037] A motor 33 is provided at one end of the hinge shaft 311 along the axial direction. The motor 33 is located outside the flue pipe 1 and is fixed to the flue pipe 1. The output shaft of the motor 33 is coaxially fixed to a first gear 331, which is an incomplete gear. A second gear 34 is coaxially fixed to the end of the hinge shaft 311 near the motor 33. The first gear 331 is used to mesh with the second gear 34. The motor 33 intermittently drives the second gear 34 to rotate through the first gear 331.

[0038] The bottom end of the collection plate 32 is connected to the collection box 35. The collection box 35 is rectangular and horizontally arranged. The top end of the collection box 35 is open and one side of the top end is fixedly connected to the bottom end of the collection plate 32.

[0039] A sealing plate 36 is slidably disposed at the top opening of the collection box 35. The sealing plate 36 is rectangular and fits the opening end of the collection box 35. The sliding direction of the sealing plate 36 is towards or away from the collection plate 32.

[0040] A telescopic rod 37 is provided between the closed plate 36 and the hinge shaft 311. The telescopic rod 37 is fixedly connected to the hinge shaft 311. The movable end of the telescopic rod 37 is hinged to the closed plate 36. When the end of the filter screen plate 31 slides to the bottom end of the collection plate 32, the hinge shaft 311 drives the telescopic rod 37 to open the closed plate 36, and the opening of the collection box 35 is in the maximum state.

[0041] In use, when the flue gas enters the flue gas pipe 1, it first flows through the filter screen plate 31. The filter screen plate 31 filters the flue gas to remove impurities. After filtration, the impurities fall onto the collection plate 32. The motor 33 is started, and the motor 33 drives the first gear 331 to rotate. The first gear 331 intermittently drives the second gear 34 to rotate. The second gear 34 drives the filter screen plate 31 to swing through the hinge shaft 311. The hinge shaft 311 drives the telescopic rod 37 to swing. The telescopic rod 37 drives the sealing plate 36 to slide, so as to open the top of the collection box 35. Under the intermittent drive of gravity and the first gear 331, the filter screen plate 31 swings back and forth, and pushes the impurities from the collection plate 32 into the collection box 35, thereby realizing the filtration and centralized collection of impurities, so that the heat exchange effect between the flue gas and the cold water is not easily reduced due to impurities.

[0042] Reference Figure 2 The portion of the cold water pipe 2 perpendicular to the flue gas flow direction is fixed with four fins 21 along the circumference. The four fins 21 correspond one-to-one with the four side walls of the cold water pipe 2. The fins 21 are vertically arranged, and there is a gap between the fins 21 close to the side wall of the flue gas pipe 1 and the side wall of the flue gas pipe 1.

[0043] The cold water pipe 2 is connected to a scraping assembly 4, which includes a scraper 41 and an electric push rod 42. The scraper 41 is rectangular and horizontally arranged. Multiple scrapers 41 are provided, each corresponding to a part of the cold water pipe 2 that is perpendicular to the flue gas flow direction. The cold water pipe 2 and the fin 21 are slidably inserted on the scraper 41.

[0044] A connecting rod 411 is provided between each of two adjacent scrapers 41. The connecting rod 411 is in the shape of a circular rod, and its two ends are fixedly connected to the two scrapers 41 that are close to it.

[0045] The electric push rod 42 is located outside the flue pipe 1 and is fixed at the top of the flue pipe 1. The movable end of the electric push rod 42 slides through the top of the flue pipe 1 and is fixedly connected to one of the scrapers 41.

[0046] The bottom end of the flue pipe 1 is provided with a discharge hole 11. The discharge hole 11 is rectangular and is directly opposite the cold water pipe 2. A discharge plate 12 is provided at the discharge hole 11. The discharge plate 12 is rectangular and is adapted to the discharge hole 11. One side of the discharge plate 12 is hinged to the flue pipe 1.

[0047] During use, cold water exchanges heat with flue gas through cold water pipe 2 and finned plate 21, increasing the heat exchange area between cold water and flue gas and improving the heat exchange effect between cold water and flue gas. When the electric push rod 42 is activated, the electric push rod 42 drives the scraper 41 connected to it to slide in a cycle. All scrapers 41 slide synchronously through connecting rod 411. The scrapers 41 scrape off the impurities attached to the cold water pipe 2 and finned plate 21 so that the heat exchange capacity of the cold water pipe 2 and finned plate 21 does not easily decrease.

[0048] The implementation principle of a heat exchanger for utilizing waste heat from flue gas according to an embodiment of this application is as follows: In use, flue gas is introduced into flue gas pipe 1, and cold water is introduced into cold water pipe 2. The filter screen plate 31 filters out impurities in the flue gas. The motor 33 and the electric push rod 42 are started. The motor 33 drives the filter screen plate 31 to swing through the first gear 331, the second gear 34 and the hinge shaft 311. The motor 33 drives the sealing plate 36 to slide through the hinge shaft 311 and the telescopic rod 37, so that the filtered impurities are discharged from the collection plate 32 and collected in the collection box 35. The electric push rod 42 drives all the scrapers 41 to slide back and forth. The scrapers 41 scrape off the impurities attached to the cold water pipe 2 and the fin plate 21. The cold water exchanges heat with the flue gas through the cold water pipe 2 and the fin plate 21 to heat the cold water, so that the heat exchange effect between the flue gas and the cold water is not easily reduced by impurities.

[0049] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A heat exchanger for utilizing waste heat from flue gas, characterized in that: The flue includes a flue pipe (1) and a cold water pipe (2) installed inside the flue pipe (1). Both ends of the cold water pipe (2) are fixedly installed on the side wall of the flue pipe (1). A filter assembly (3) is provided at the air inlet end of the flue pipe (1). The filter assembly (3) includes a filter screen plate (31) and a collection plate (32). One side of the filter screen plate (31) is hinged to the flue pipe (1) through a hinge shaft (311). The collection plate (32) is bent into an arc shape and is located on the side of the filter screen plate (31) away from the hinge shaft (311). The collection plate (32) is fixedly connected to the flue pipe (1). The side of the filter screen plate (31) away from the hinge shaft (311) is in contact with the arc surface of the collection plate (32) and is slidably connected to the collection plate (32).

2. A heat exchanger for utilizing waste heat from flue gas according to claim 1, characterized in that: The hinge shaft (311) is fixedly connected to the filter screen (31) and rotatably connected to the flue pipe (1). A motor (33) is provided at one end of the hinge shaft (311). The motor (33) is fixedly connected to the flue pipe (1). The output shaft of the motor (33) is coaxially fixedly connected to a first gear (331). The first gear (331) is an incomplete gear. A second gear (34) is coaxially fixedly connected to one end of the hinge shaft (311) near the motor (33). The first gear (331) is used to mesh with the second gear (34).

3. A heat exchanger for utilizing waste heat from flue gas according to claim 2, characterized in that: The bottom end of the collection plate (32) is fixedly connected to a collection box (35) with an open top.

4. A heat exchanger for flue gas waste heat utilization according to claim 3, characterized in that: The opening end of the collection box (35) is slidably provided with a closing plate (36), and a telescopic rod (37) is provided between the closing plate (36) and the hinge shaft (311). The telescopic rod (37) is fixedly connected to the hinge shaft (311), and the movable end of the telescopic rod (37) is hinged to the closing plate (36).

5. A heat exchanger for utilizing waste heat from flue gas according to claim 1, characterized in that: The cold water pipe (2) is arranged in a serpentine bend along the flue gas flow direction in the flue gas pipe (1). The part of the cold water pipe (2) perpendicular to the flue gas flow direction is fixed with multiple fins (21) along the circumferential direction. The fins (21) are arranged along the water flow direction in the cold water pipe (2). There is a gap between the fins (21) and the side wall of the flue gas pipe (1).

6. A heat exchanger for utilizing waste heat from flue gas according to claim 5, characterized in that: The cold water pipe (2) is connected to a scraper assembly (4), which includes a scraper (41). Multiple scrapers (41) are provided, each corresponding to a portion of the cold water pipe (2) perpendicular to the flue gas flow direction. The cold water pipe (2) and the fin (21) are slidably mounted on the scraper (41).

7. A heat exchanger for flue gas waste heat utilization according to claim 6, characterized in that: The two adjacent scrapers (41) are fixedly connected by a connecting rod (411). One of the scrapers (41) is connected to an electric push rod (42). The electric push rod (42) is fixed on the outer side wall of the flue pipe (1). The movable end of the electric push rod (42) slides through the side wall of the flue pipe (1) and is fixedly connected to the corresponding scraper (41).

8. A heat exchanger for utilizing waste heat from flue gas according to claim 6, characterized in that: The bottom end of the flue pipe (1) is provided with a discharge hole (11), and a discharge plate (12) is adapted to cover the discharge hole (11). One side of the discharge plate (12) is hinged to the flue pipe (1).

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