A waste heat recovery device for a heating furnace

Abstract

The utility model discloses a kind of waste heat recovery devices for heating furnace, belong to heating furnace waste heat recovery technical field;It is applied to heating furnace, including recovery tank;Filter screen and heat exchange pipe are provided in recovery tank, filter screen is located above heat exchange pipe, recovery tank top is provided with spray head, the spray head of being able to simultaneously clean filter screen and heat exchange pipe is located above filter screen;First clamping groove is opened in recovery tank inner wall, first clamping groove is provided with the baffle that can be closed spray head, second clamping groove is opened in recovery tank inner wall, filter screen is located in second clamping groove;Scraping assembly that can be scraped to the outer wall of heat exchange pipe is horizontally slidably arranged in recovery tank.This application is by integrating spray head in recovery tank, without disassembling recovery tank, can utilize spray head to flush filter screen and heat exchange pipe.In addition, by setting baffle, the durability of spray head can be guaranteed.

Description

Technical Field

[0001] This utility model provides a waste heat recovery device for heating furnaces, belonging to the field of waste heat recovery technology for heating furnaces, and particularly relates to a waste heat recovery device for flue gas from heating furnaces. Background Technology

[0002] Heating furnaces are key thermal equipment in industries such as metallurgy, chemical engineering, and building materials, primarily used for metal heat treatment, raw material calcination, and industrial product processing. During furnace operation, the direct emission of high-temperature flue gas generated from fuel combustion carries away a significant amount of heat energy, resulting in energy waste.

[0003] In existing technologies, waste heat recovery devices typically consist of filters and heat exchange tubes: the filters intercept dust and particulate matter in the flue gas, preventing blockage of the heat exchange tubes; the heat exchange tubes then transfer heat from the flue gas to the recovery medium (such as water, air, or heat transfer oil) through conduction. However, due to the large amounts of ash, tar, and corrosive components in the flue gas, the surfaces of the filters and heat exchange tubes are prone to ash and scale buildup, leading to decreased heat exchange efficiency and increased system resistance. Traditional cleaning methods require disassembling the entire device and then using tools or installing cleaning structures for rinsing, which is cumbersome. While integrating cleaning structures (such as nozzles) inside the device can reduce manual intervention, these structures are exposed to high-temperature, highly corrosive flue gas environments for extended periods, making them prone to deformation, corrosion, or jamming, significantly reducing their service life. Therefore, a waste heat recovery device cleaning solution is urgently needed to balance cleaning efficiency and equipment durability. Utility Model Content

[0004] The technical problem this invention aims to solve is that when cleaning the filter screen and heat exchange tubes inside the waste heat recovery device, the traditional method of disassembling and opening the entire device is inefficient, while the method of integrating the cleaning structure inside the device is prone to causing insufficient durability of the cleaning structure.

[0005] To solve the above problems, the present invention proposes the following technical solution: a waste heat recovery device for a heating furnace, which is applied to a heating furnace and includes a recovery box; the heating furnace is connected to the recovery box, which can recover waste heat from the flue gas, through a flue pipe, and an exhaust pipe is provided at the bottom of the recovery box; a filter screen and a heat exchange tube are provided inside the recovery box, and the medium inside the heat exchange tube is circulating water; The filter screen is located above the heat exchange tube. A nozzle is installed on the top of the recovery box, which can clean both the filter screen and the heat exchange tube simultaneously. The nozzle is located above the filter screen. A first slot is provided on the inner wall of the recovery box. A partition is installed in the first slot to seal the nozzle. A heat insulation layer is installed inside the partition, and the exhaust pipe is located between the partition and the filter screen. A second slot is provided on the inner wall of the recovery box, and the filter screen is located in the second slot. An opening is provided on the outer wall of the recovery box, which communicates with the first slot and facilitates the removal of the partition. A first sealing cover is fixedly installed on the outer wall of the recovery box to block the opening. A scraping component is horizontally slidably installed inside the recovery box to scrape and clean the outer wall of the heat exchange tube.

[0006] Preferably, a water tank is provided at the rear of the recycling bin, and a water pump is provided on the water tank, and the water pump is connected to the nozzle through a delivery pipe.

[0007] Preferably, the outer wall of the recycling bin has an opening that communicates with the second slot and facilitates the removal of the filter screen, and a second sealing cover that blocks the opening is fixedly installed on the outer wall of the recycling bin; the first sealing cover and the second sealing cover are both fixedly connected to the recycling bin by screws, and a sealing gasket is provided at the position where the first sealing cover and the second sealing cover are connected to the recycling bin.

[0008] Preferably, the scraping assembly includes a sliding plate and a scraper; the sliding plate is slidably sleeved on the heat exchange tube, and the scraper is fixedly connected to the sliding plate; the conical scraper is tightly fitted to the outer wall of the heat exchange tube, and the number of scrapers is the same as the number of heat exchange tubes.

[0009] Preferably, a support plate is fixedly installed on the outer wall of the recycling bin, and an electric telescopic rod is installed on the support plate, with the working end of the electric telescopic rod fixedly connected to the sliding plate.

[0010] Preferably, the bottom of the recycling bin is connected to a drain pipe for wastewater discharge, and valves are installed on the drain pipe, the vent pipe, and the smoke exhaust pipe.

[0011] The beneficial effects of this utility model are: 1. The nozzle, which can clean both the filter screen and the heat exchange tubes simultaneously, is located above the filter screen. By integrating the nozzle into the recycling bin, the filter screen can be rinsed with the nozzle without disassembling the recycling bin. At the same time, the wastewater from rinsing the filter screen can flow downwards onto the heat exchange tubes, thus cleaning the heat exchange tubes in conjunction with the scraping component, achieving two goals at once.

[0012] 2. The first slot is equipped with a partition that can seal the nozzle. The partition has a heat insulation layer, and the exhaust pipe is located between the partition and the filter screen. By setting a removable partition, the nozzle is isolated when it is not in use, reducing the impact of high temperature and highly corrosive fumes on the nozzle. When the nozzle needs to be used, the partition can be removed, which can balance cleaning efficiency and nozzle durability. Attached Figure Description

[0013] Figure 1 This is a perspective view of the present invention.

[0014] Figure 2 This is a side view of the present invention.

[0015] Figure 3 This is a rear view of the present invention.

[0016] Figure 4 This is a cross-sectional view of the recycling bin of this utility model.

[0017] Figure 5 This is a partial sectional view of the present invention.

[0018] 1. Heating furnace; 2. Exhaust pipe; 3. Recycling bin; 4. First sealing cover; 5. Second sealing cover; 6. Water tank; 7. Water pump; 8. Conveying pipe; 9. Gas outlet pipe; 10. Nozzle; 11. Baffle plate; 12. First slot; 13. Second slot; 14. Filter screen; 15. Support plate; 16. Electric telescopic rod; 17. Heat exchange pipe; 18. Drain pipe; 19. Sliding plate; 20. Scraper. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] like Figure 1 , 4 As shown, this utility model provides a waste heat recovery device for a heating furnace, applied to a heating furnace 1, including a recovery box 3; the heating furnace 1 is connected to the recovery box 3, which can recover waste heat from the flue gas, through a flue pipe 2, and the bottom of the recovery box 3 is provided with an exhaust pipe 9; a filter screen 14 and a heat exchange pipe 17 are provided inside the recovery box 3, and the medium in the heat exchange pipe 17 is circulating water; a drain pipe 18 for wastewater discharge is connected to the bottom of the recovery box 3, and valves are provided on the drain pipe 18, the exhaust pipe 9, and the flue pipe 2.

[0021] like Figure 4As shown, the filter screen 14 is located above the heat exchange tube 17, and a nozzle 10 is provided on the top of the recovery box 3. The nozzle 10, which can clean the filter screen 14 and the heat exchange tube 17 at the same time, is located above the filter screen 14. A first slot 12 is provided on the inner wall of the recovery box 3. A partition 11 that can seal the nozzle 10 is provided in the first slot 12. A heat insulation layer is provided in the partition 11, and the exhaust pipe 2 is located between the partition 11 and the filter screen 14. The nozzle 10 is pre-installed in the recovery box 3 to facilitate the cleaning of the filter screen 14 and the heat exchange tube 17. At the same time, by setting the partition 11 with the heat insulation layer, the impact and corrosion of high-temperature flue gas on the nozzle 10 can be greatly reduced. like Figure 3 As shown, a water tank 6 is provided on the rear side of the recycling bin 3, and a water pump 7 is provided on the water tank 6. The water pump 7 is connected to the nozzle 10 through the delivery pipe 8. The water pump 7 and the water tank 6 can provide power and water source for the operation of the nozzle 10.

[0022] like Figure 4 As shown, the inner wall of the recycling bin 3 has a second slot 13, and the filter screen 14 is located in the second slot 13; the outer wall of the recycling bin 3 has an opening that communicates with the first slot 12 and facilitates the removal of the partition 11, and a first sealing cover 4 that blocks the opening is fixedly installed on the outer wall of the recycling bin 3; the outer wall of the recycling bin 3 has an opening that communicates with the second slot 13 and facilitates the removal of the filter screen 14, and a second sealing cover 5 that blocks the opening is fixedly installed on the outer wall of the recycling bin 3; the first sealing cover 4 and the second sealing cover 5 are both fixedly connected to the recycling bin 3 by screws, which is easy to disassemble, and a sealing gasket is provided at the connection position between the first sealing cover 4 and the second sealing cover 5 and the recycling bin 3, which can increase the sealing performance of the recycling bin 3.

[0023] like Figure 4 , 5 As shown, a scraping assembly capable of scraping and cleaning the outer wall of the heat exchange tubes 17 is horizontally slidably installed inside the recycling bin 3. The scraping assembly includes a sliding plate 19 and a scraper 20; the sliding plate 19 is slidably sleeved on the heat exchange tubes 17, and the scraper 20 is fixedly connected to the sliding plate 19; the conical scraper 20 is in close contact with the outer wall of the heat exchange tubes 17, and the number of scrapers 20 is the same as the number of heat exchange tubes 17, which can scrape all the heat exchange tubes 17 at the same time, improving cleaning efficiency. At the same time, the sliding plate 19 and the scraper 20 are made of materials that are resistant to high temperature and flue gas corrosion, thereby increasing their service life. A support plate 15 is fixedly installed on the outer wall of the recycling bin 3, and an electric telescopic rod 16 is installed on the support plate 15. The working end of the electric telescopic rod 16 is fixedly connected to the sliding plate 19, which facilitates the sliding control of the sliding plate 19.

[0024] The principle of this utility model like Figure 1 , 2As shown in Figure 4, the high-temperature flue gas in the heating furnace 1 can enter the recovery box 3 through the exhaust pipe 2. At this time, the baffle 11 can isolate the nozzle 10, reducing the high-temperature impact and corrosion of the nozzle 10 by the high-temperature flue gas. After being filtered by the filter screen 14, the high-temperature flue gas exchanges heat with the heat exchange tube 17 and finally flows out from the exhaust pipe 9.

[0025] When it is necessary to clean the filter screen 14 and heat exchange tube 17 inside the recycling bin 3, first ensure that the recycling bin 3 is in a non-operating state, such as... Figure 3 , 4 As shown, remove the first sealing cover 4 and pull the partition 11 out of the first slot 12 to release the isolation of the nozzle 10. Start the water pump 7 to clean the filter screen 14 through the delivery pipe 8 and the nozzle 10. Since the heat exchange pipe 17 is located below the filter screen 14, the water flows downward through the filter screen 14, which also cleans the heat exchange pipe 17. The wastewater after cleaning is discharged through the drain pipe 18. During cleaning, if... Figure 5 As shown, the electric telescopic rod 16 can also be activated to drive the sliding plate 19 to slide, causing the scraper 20 to scrape the heat exchange tube 17, thus improving the cleaning effect. It should be noted that due to the obstruction of the filter screen 14, the water flow impact on the heat exchange tube 17 is relatively weak. Therefore, the cleaning of the heat exchange tube 17 is not achieved by the impact of the water flow, but rather by the water flow primarily wetting and immersing the heat exchange tube 17 to reduce the adhesion of impurities. The cleaning of the heat exchange tube 17 relies mainly on the scraping action of the scraper 20. Furthermore, this application also allows for the disassembly and replacement of the filter screen 14, such as... Figure 4 As shown, if rinsing is no longer sufficient to clean the filter screen 14, the second sealing cover 5 can be removed to replace the old filter screen 14.

[0026] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A waste heat recovery device for a heating furnace, applied to a heating furnace (1), comprising a recovery box (3); the heating furnace (1) is connected to the recovery box (3) capable of recovering waste heat from flue gas via a flue pipe (2), and an exhaust pipe (9) is provided at the bottom of the recovery box (3); a filter screen (14) and a heat exchange tube (17) are provided inside the recovery box (3), and the medium inside the heat exchange tube (17) is circulating water; characterized in that: The filter screen (14) is located above the heat exchange tube (17). A nozzle (10) is provided on the top of the recovery box (3). The nozzle (10) is located above the filter screen (14) and can clean both the filter screen (14) and the heat exchange tube (17) at the same time. A first slot (12) is provided on the inner wall of the recovery box (3). A partition (11) is provided in the first slot (12) to seal the nozzle (10). A heat insulation layer is provided in the partition (11), and the exhaust pipe (2) is located in the partition (11). 11) Between the filter screen (14); the inner wall of the recycling box (3) is provided with a second slot (13), and the filter screen (14) is located in the second slot (13); the outer wall of the recycling box (3) is provided with an opening that communicates with the first slot (12) and facilitates the removal of the partition (11); the outer wall of the recycling box (3) is fixedly provided with a first sealing cover (4) that blocks the opening; a scraping component that can scrape and clean the outer wall of the heat exchange tube (17) is horizontally slidably provided inside the recycling box (3).

2. The waste heat recovery device for a heating furnace according to claim 1, characterized in that: A water tank (6) is provided on the rear side of the recycling bin (3), and a water pump (7) is provided on the water tank (6). The water pump (7) is connected to the nozzle (10) through the delivery pipe (8).

3. The waste heat recovery device for a heating furnace according to claim 1, characterized in that: The outer wall of the recycling bin (3) is provided with an opening that communicates with the second slot (13) and facilitates the removal of the filter screen (14). The outer wall of the recycling bin (3) is fixedly provided with a second sealing cover (5) that blocks the opening. The first sealing cover (4) and the second sealing cover (5) are both fixedly connected to the recycling bin (3) by screws, and a sealing gasket is provided at the position where the first sealing cover (4) and the second sealing cover (5) are connected to the recycling bin (3).

4. The waste heat recovery device for a heating furnace according to claim 1, characterized in that: The scraping assembly includes a sliding plate (19) and a scraper (20); the sliding plate (19) is slidably sleeved on the heat exchange tube (17), and the scraper (20) is fixedly connected to the sliding plate (19); the conical scraper (20) is tightly fitted to the outer wall of the heat exchange tube (17), and the number of scrapers (20) is the same as the number of heat exchange tubes (17).

5. A waste heat recovery device for a heating furnace according to claim 4, characterized in that: The outer wall of the recycling bin (3) is fixedly provided with a support plate (15), and an electric telescopic rod (16) is provided on the support plate (15), and the working end of the electric telescopic rod (16) is fixedly connected to the sliding plate (19).

6. The waste heat recovery device for a heating furnace according to claim 1, characterized in that: The bottom of the recycling bin (3) is connected to a drain pipe (18) for wastewater discharge. Valves are installed on the drain pipe (18), the vent pipe (9), and the smoke exhaust pipe (2).

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