Waste heat utilization device of silicon carbide smelting furnace

Abstract

The utility model discloses a kind of waste heat utilization devices of silicon carbide smelting furnace, including heat exchange device, including jar body, the inside of jar body is equipped with multiple heat exchange pipes by multiple sleeve boards, the both ends of multiple heat exchange pipes are fixedly installed with end plate, and the both ends of heat exchange pipe are open;End cap one, it is installed in the front end of heat exchange device;End cap two, it is installed in the rear end of heat exchange device;Cleaning device, it is installed in the rear side of end cap two, including fixed plate, fixed plate is fixed with end cap two by multiple mounting racks, multiple guide rods are also fixedly connected between fixed plate and end cap two, multiple guide rods are slidably installed with movable plate, movable plate side is fixed with multiple cleaning rods corresponding with heat exchange pipe, cleaning rod penetrates end cap two and is fixedly connected with sealing cap;The waste heat utilization device of silicon carbide smelting furnace is by setting independent cleaning device, the online cleaning of heat exchange pipe inner wall is realized, and heat exchange efficiency can be maintained without disassembling device.

Description

Technical Field

[0001] This utility model relates to the technical field of waste heat recovery equipment, specifically a waste heat utilization device for a silicon carbide smelting furnace. Background Technology

[0002] Silicon carbide, as a high-performance ceramic material, is widely used in abrasives, refractories, semiconductors, and other fields. Its smelting process typically employs a high-temperature electric arc furnace, where temperatures can reach over 2000℃. This process generates a large amount of high-temperature flue gas, containing abundant waste heat resources. Recovering and utilizing this waste heat not only reduces energy consumption but also minimizes thermal pollution, resulting in significant economic and environmental benefits.

[0003] Existing waste heat recovery devices for silicon carbide smelting furnaces mostly employ heat exchange tubes to exchange heat with flue gas, absorbing heat from the flue gas through cold water or other media and converting it into hot water or steam for subsequent use. However, because silicon carbide smelting flue gas contains a large amount of dust and impurities, scale easily accumulates on the inner walls of the heat exchange tubes after long-term use, leading to a decrease in heat exchange efficiency. Furthermore, the heat exchange tubes in existing devices are mostly fixed installations, requiring disassembly or shutdown for cleaning, which is cumbersome, disrupts production continuity, and increases maintenance costs. Therefore, it is necessary to design a waste heat recovery device for silicon carbide smelting furnaces to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a waste heat utilization device for a silicon carbide smelting furnace to solve the problems mentioned in the background art.

[0005] The technical solution adopted by this application to solve its technical problem is: a waste heat utilization device for a silicon carbide smelting furnace, comprising: A heat exchange device includes a tank, inside which multiple heat exchange tubes are installed via multiple sleeves. Both ends of the multiple heat exchange tubes are fixedly installed with end plates, and both ends of the heat exchange tubes are open. End cap one, which is installed at the front end of the heat exchanger for flue gas to enter; End cap two, which is installed at the rear end of the heat exchanger; The cleaning device, which is installed on the rear side of the second end cover, includes a fixing plate. The fixing plate is fixed to the second end cover by multiple mounting brackets. Multiple guide rods are also fixedly connected between the fixing plate and the second end cover. A movable plate is slidably installed between the multiple guide rods. Multiple cleaning rods corresponding to the heat exchange tubes are fixed on one side of the movable plate. The cleaning rods pass through the second end cover and are fixedly connected to a sealing cover.

[0006] Furthermore, a screw is rotatably connected between the upper end of the movable plate and the second end cover, a motor for driving the screw is installed at the rear end of the fixed plate, and the upper side of the movable plate is sleeved with the screw.

[0007] Furthermore, the sealing cap abuts against the inner wall of the second end cap, wherein the diameter of the sealing cap is smaller than the inner diameter of the heat exchange tube and larger than the diameter of the opening on the second end cap for the cleaning rod to pass through.

[0008] Furthermore, the outer end of the cleaning rod is provided with bristles arranged in a circular pattern. The bristles are made of a flexible material and can contact the inner wall of the heat exchange tube when the cleaning rod is inserted into the heat exchange tube.

[0009] Furthermore, the end cap includes a cover body. Both the upper and lower sides of the outer end of the cover body are equipped with flue gas pipes. The two flue gas pipes are used for flue gas inlet and outlet, respectively. A partition is fixedly installed on the inner side of the cover body between the upper and lower flue gas pipes. One end of the partition is sealed and abuts against the adjacent end plate, dividing the openings of the multiple heat exchange tubes into upper and lower parts.

[0010] Furthermore, the heat exchange device is provided with an inlet pipe and a drain pipe on its upper and lower sides, respectively, and a steam discharge pipe is provided on the upper side of the tank.

[0011] Furthermore, the outer end of the sleeve is provided with multiple openings, which are suitable for the flow of liquid inside the tank.

[0012] By adopting the above technical solution, the problem of heat exchange tubes in existing silicon carbide smelting furnace waste heat utilization devices needing to be disassembled or shut down due to scale buildup, which affects efficiency and has high maintenance costs, is solved, enabling online cleaning and improving efficiency.

[0013] Compared with existing technologies, the beneficial effects of this utility model are as follows: This waste heat utilization device for a silicon carbide smelting furnace, through the setting of an independent cleaning device and the cooperative design of the cleaning rod and heat exchange tube, achieves online cleaning of the inner wall of the heat exchange tube, maintaining heat exchange efficiency without disassembling the device. During cleaning, the motor drives the movable plate along the guide rod through the screw, causing the cleaning rod to extend into the heat exchange tube, and the flexible bristles can effectively remove dirt from the inner wall. At the same time, the baffle design of the end cover causes the flue gas to form a reflux flow in the heat exchange tube, prolonging the heat exchange time and improving the waste heat recovery efficiency; the through-hole design of the sleeve plate ensures uniform flow of the medium in the tank, further optimizing the heat exchange effect. This device has a compact structure, is easy to operate, and can complete cleaning without affecting production, significantly reducing maintenance costs and improving equipment continuity and stability. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of a waste heat utilization device for a silicon carbide smelting furnace according to an embodiment of this application. Figure 2 This is a three-dimensional structural schematic diagram of a cleaning device in a waste heat utilization device for a silicon carbide smelting furnace according to an embodiment of this application. Figure 3This is a schematic diagram of the extended structure of the cleaning rod in a waste heat utilization device for a silicon carbide smelting furnace according to an embodiment of this application. Figure 4 This is a schematic diagram of the internal structure of the tank in a waste heat utilization device for a silicon carbide smelting furnace according to an embodiment of this application. Figure 1 ; Figure 5 This is a schematic diagram of the internal structure of the tank in a waste heat utilization device for a silicon carbide smelting furnace according to an embodiment of this application. Figure 2 .

[0015] In the diagram: 1. Heat exchanger; 11. Tank body; 12. Heat exchange tube; 13. Sleeve plate; 14. End plate; 15. Water inlet pipe; 16. Steam exhaust pipe; 17. Drain pipe; 2. End cover one; 21. Cover body one; 22. Flue gas pipe; 23. Baffle plate; 3. End cover two; 4. Cleaning device; 41. Fixing plate; 42. Mounting bracket; 43. Guide rod; 44. Movable plate; 45. Cleaning rod; 46. Screw; 47. Motor; 48. Sealing cover. 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.

[0017] Please see Figure 1-5 This utility model provides a technical solution: a waste heat utilization device for a silicon carbide smelting furnace, including a heat exchange device 1. The main body of the heat exchange device 1 is a tank 11, which is made of high-temperature resistant metal material. Multiple parallel heat exchange tubes 12 are fixedly installed inside the tank through multiple sleeve plates 13. The heat exchange tubes 12 are hollow metal tubes, and end plates 14 are welded and fixed at both ends. The end plates 14 are sealed to the inner wall of the tank 11, so that two independent spaces are formed inside the tank 11: a flue gas passage inside the heat exchange tubes 12 and a cooling medium passage between the heat exchange tubes 12 and the tank 11.

[0018] The heat exchanger 1 is equipped with end cover 2 at the front end and end cover 3 at the rear end. Both end cover 2 and end cover 3 are connected to the tank 11 through flanges, and a sealing gasket is provided at the connection to ensure that the flue gas does not leak out.

[0019] A cleaning device 4 is installed on the rear side of the end cover 3. The cleaning device 4 includes a fixing plate 41. The fixing plate 41 is fixedly connected to the end cover 3 through multiple mounting brackets 42. Multiple guide rods 43 are fixed parallel between the fixing plate 41 and the end cover 3. A movable plate 44 is slidably sleeved on the guide rod 43. Multiple cleaning rods 45 are vertically fixed on the side of the movable plate 44 near the end cover 3. The number of cleaning rods 45 corresponds one-to-one with the heat exchange tube 12 and passes through the reserved hole on the end cover 3. A sealing cap 48 is fixedly connected to the end.

[0020] A screw 46 passes through the upper end of the movable plate 44. The front end of the screw 46 is rotatably connected to the end cover 3 via a bearing, and the rear end passes through the fixed plate 41 and is connected to the output end of the motor 47. The motor 47 is fixed to the rear end of the fixed plate 41. When the motor 47 is working, it drives the screw 46 to rotate forward and backward, causing the movable plate 44 to slide back and forth along the guide rod 43, thereby realizing the extension and retraction of the cleaning rod 45.

[0021] The diameter of the sealing cap 48 is smaller than the inner diameter of the heat exchange tube 12 (to ensure it can enter the heat exchange tube 12), and larger than the diameter of the through hole of the cleaning rod 45 on the end cap 3. When the cleaning rod 45 retracts, the sealing cap 48 abuts tightly against the inner wall of the end cap 3, sealing the through hole and preventing flue gas from leaking out of the hole; when the cleaning rod 45 extends, the sealing cap 48 enters the heat exchange tube 12 along with the cleaning rod 45, preventing flue gas from overflowing during the cleaning process.

[0022] The outer end of the cleaning rod 45 is surrounded by bristles made of high-temperature resistant flexible material (such as ceramic fiber). The bristles are slightly longer than the difference between the inner diameter of the heat exchange tube 12 and the diameter of the cleaning rod 45, so that when the cleaning rod 45 is inserted into the heat exchange tube 12, the bristles can make close contact with the inner wall and effectively remove the attached dust and dirt.

[0023] End cap 2 includes a cap body 21. Flue gas pipes 22 are welded to the upper and lower sides of the outer end of the cap body 21. The upper flue gas pipe 22 connects to the flue gas outlet of the silicon carbide smelting furnace (for flue gas intake), and the lower flue gas pipe 22 connects to a subsequent purification device (for flue gas exhaust). A partition plate 23 is welded to the inner side of the cap body 21 between the two flue gas pipes 22. One end of the partition plate 23 is sealed against the front end plate 14, dividing the opening of the heat exchange tube 12 on the end plate 14 into upper and lower parts: the upper opening connects to the upper flue gas pipe 22, and the lower opening connects to the lower flue gas pipe 22. This structure allows flue gas to enter from the upper heat exchange tube 12, bend back at the rear end, and exit from the lower heat exchange tube 12, extending the flow path of the flue gas within the heat exchange tube 12 and improving heat exchange efficiency.

[0024] The heat exchanger 1 has an inlet pipe 15 (connected to a cold water source) on its lower side, and a drain pipe 17 (for discharging hot water) and a steam discharge pipe 16 (for discharging generated steam) on its upper side. Valves can be installed on the inlet pipe 15, drain pipe 17, and steam discharge pipe 16 to facilitate switching the operating mode (producing hot water or steam) as needed. Multiple openings are provided at the outer end of the sleeve 13 to allow the medium (cold water) in the tank 11 to flow freely between the sleeves 13, ensuring uniform temperature of the medium around each heat exchange tube 12 and avoiding local overheating.

[0025] Working principle: During waste heat recovery, cold water enters the medium channel of tank 11 through inlet pipe 15. High-temperature flue gas from the silicon carbide smelting furnace enters end cover 2 through upper flue gas pipe 22, is guided by baffle 23 into upper heat exchange tube 12, flows through heat exchange tube 12 and then turns back from the rear end into lower heat exchange tube 12, and finally exits from lower flue gas pipe 22. When the flue gas flows in heat exchange tube 12, heat is transferred to the cold water in tank 11 through the tube wall. After absorbing heat, the cold water can form hot water (exited from drain pipe 17) or steam (exited from steam exhaust pipe 16), thus realizing waste heat recovery.

[0026] When scale buildup on the inner wall of heat exchange tube 12 affects efficiency, the cleaning device 4 is activated: motor 47 drives screw 46 to rotate, causing movable plate 44 to move forward along guide rod 43, and cleaning rod 45 extends into heat exchange tube 12, with bristles contacting the inner wall to remove the scale; after cleaning, motor 47 reverses, movable plate 44 drives cleaning rod 45 to retract, sealing cover 48 re-abuts against the inner wall of end cover 3, sealing the through hole, and the device returns to waste heat recovery state.

[0027] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A waste heat utilization device for a silicon carbide smelting furnace, characterized in that, include: The heat exchange device (1) includes a tank (11), and multiple heat exchange tubes (12) are installed inside the tank (11) through multiple sleeves (13). Both ends of the multiple heat exchange tubes (12) are fixedly installed with end plates (14), and both ends of the heat exchange tubes (12) are open. End cap 1 (2), which is installed at the front end of the heat exchange device (1) for flue gas to enter; End cap two (3) is installed at the rear end of the heat exchanger (1); The cleaning device (4) is installed on the rear side of the end cover (3) and includes a fixing plate (41). The fixing plate (41) is fixed to the end cover (3) by multiple mounting brackets (42). Multiple guide rods (43) are also fixedly connected between the fixing plate (41) and the end cover (3). A movable plate (44) is slidably installed between the multiple guide rods (43). Multiple cleaning rods (45) corresponding to the heat exchange tube (12) are fixed on one side of the movable plate (44). The cleaning rods (45) penetrate the end cover (3) and are fixedly connected to a sealing cover (48).

2. The waste heat utilization device for a silicon carbide smelting furnace according to claim 1, characterized in that: A screw (46) is rotatably connected between the upper end of the movable plate (44) and the end cover (3). A motor (47) for driving the screw (46) is installed at the rear end of the fixed plate (41). The upper side of the movable plate (44) is sleeved with the screw (46).

3. The waste heat utilization device for a silicon carbide smelting furnace according to claim 2, characterized in that: The sealing cap (48) abuts against the inner wall of the end cap (3), wherein the diameter of the sealing cap (48) is smaller than the inner diameter of the heat exchange tube (12) and larger than the diameter of the opening on the end cap (3) through which the cleaning rod (45) passes.

4. The waste heat utilization device for a silicon carbide smelting furnace according to claim 3, characterized in that: The outer end of the cleaning rod (45) is provided with bristles arranged in a circle. The bristles are made of a flexible material and can contact the inner wall of the heat exchange tube (12) when the cleaning rod (45) is inserted into the heat exchange tube (12).

5. The waste heat utilization device for a silicon carbide smelting furnace according to claim 1, characterized in that: The end cap 1 (2) includes a cover body 1 (21). Both the upper and lower sides of the outer end of the cover body 1 (21) are equipped with flue gas pipes (22). The two flue gas pipes (22) are used for flue gas inlet and outlet respectively. A partition (23) is fixedly installed on the inner side of the cover body 1 (21) between the upper and lower flue gas pipes (22). One end of the partition (23) is sealed and abutted against the nearby end plate (14), and divides the openings of the multiple heat exchange tubes (12) into upper and lower parts.

6. The waste heat utilization device for a silicon carbide smelting furnace according to claim 1, characterized in that: The heat exchange device (1) is provided with an inlet pipe (15) and a drain pipe (17) on its upper and lower sides respectively, and a steam discharge pipe (16) is provided on the upper side of the tank (11).

7. The waste heat utilization device for a silicon carbide smelting furnace according to claim 6, characterized in that: The outer end of the sleeve (13) is provided with multiple openings, which are suitable for the flow of liquid inside the tank (11).

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