A waste heat recovery device for a carbon furnace

Abstract

The application discloses a waste heat recovery device of a carbon furnace, and relates to the technical field of waste heat recovery, which comprises a connecting frame, a water tank is welded to the upper surface of the connecting frame, a gas tank is fixedly arranged on the upper surface of the water tank, a first connecting pipe penetrates through the outer side of the gas tank, a connecting port is welded to the end of the first connecting pipe away from the gas tank, the connecting port is used for connecting the device with the exhaust hole of the carbon furnace, a fixing plate is welded to the upper surface of the gas tank, an annular tank is fixedly arranged on the upper surface of the fixing plate, and the waste heat recovery device further comprises a gas purification mechanism, a heat exchange mechanism and a water tank. The gas purification mechanism is used for purifying the hot air drawn from the inside of the carbon furnace, and is arranged directly above the gas tank; the heat exchange mechanism is used for absorbing the heat in the hot air, and is arranged between the water tank and the gas tank, so that the waste heat of the high-temperature flue gas discharged from the carbon furnace can be utilized.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, specifically to a waste heat recovery device for a carbon furnace. Background Technology

[0002] A carbon furnace, professionally known as a carbon material calcination furnace, is a core thermal equipment in carbon industrial production. Its main function is to perform high-temperature heat treatment on pressed green products (such as graphite electrodes and cathode carbon blocks) under air-isolated conditions. This equipment is typically constructed of refractory materials and contains a fixed furnace chamber and fire channels. Its working principle utilizes the high-temperature flame generated by fuel combustion to indirectly heat the carbon green products in the feed bin through the fire channel walls. During this process, the binder pitch in the green products cokes, releasing volatiles and forming a coke network, thereby giving the products higher mechanical strength, electrical conductivity, and high-temperature resistance.

[0003] In the production process of carbon furnaces, untreated finished products require a long period of natural cooling before being discharged from the furnace, while the furnace continuously emits large amounts of high-temperature flue gas. Directly emitted high-temperature flue gas causes thermal pollution to the surrounding local climate, impacting the ecological environment of the factory area and its vicinity. More importantly, because waste heat cannot be recovered to preheat combustion air or gas, fuel combustion efficiency is significantly reduced, not only wasting fuel but also potentially producing more harmful gases due to incomplete combustion, increasing the pressure on subsequent environmental treatment. The lack of waste heat utilization methods often means that additional cooling systems are needed to forcibly cool the products before they exit the furnace. This not only prolongs the production cycle and affects production efficiency but also increases the complexity of equipment maintenance and energy consumption. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a waste heat recovery device for a carbon furnace, comprising a connecting frame, a water tank welded to the upper surface of the connecting frame, a gas box fixed to the upper surface of the water tank, a first connecting pipe penetrating the outer side of the gas box, a connection port welded to the end of the first connecting pipe away from the gas box, the connection port being used to connect the device to the exhaust port of the carbon furnace, a fixing plate welded to the upper surface of the gas box, an annular box fixed to the upper surface of the fixing plate, and further comprising: A gas purification mechanism is used to purify the hot air extracted from inside the carbon furnace, and the gas purification mechanism is located directly above the gas box. A heat exchange mechanism for absorbing heat from hot air is disposed between a water tank and an air tank. The heat exchange mechanism includes a heat exchange tube that passes through the connection between the gas tank and the water tank. The heat exchange tube is tightly connected to the gas tank and the water tank. An opening groove is provided on one side of the heat exchange tube located inside the water tank. The water tank is connected to the inner cavity of the heat exchange tube.

[0005] Preferably, the gas purification mechanism includes a rolling bearing, which is fixed on the upper surface of the gas box. A rotating box is fixed on the inner ring of the rolling bearing. The bottom opening of the rotating box is aligned with the opening on the upper surface of the gas box, and the rotating box is connected to the gas box.

[0006] Preferably, a screening cylinder is fixed on the outer surface of the rotating box, and a number of evenly distributed small holes are opened on the outer surface of the screening cylinder. There are three screening cylinders, and the three screening cylinders are evenly distributed. The screening cylinders are connected to the rotating box, and an inner hexagonal ring is fixed on the upper surface of the rotating box.

[0007] Preferably, the gas purification mechanism further includes a top cover, which is movably connected to the top of the annular box. An adsorption ring is fixed on the lower surface of the top cover. The adsorption ring is an annular adsorption cylinder with a notch, and the outer surface of the sieve cylinder is rubbed against the inner wall of the adsorption ring.

[0008] Preferably, a fixing frame is fixed on the upper surface of the top cover, a stepper motor is fixed on the inner wall of the fixing frame, a rotating rod is installed at the output end of the stepper motor through a coupling, a hexagonal disk is fixed at the bottom end of the rotating rod, the hexagonal disk is rotatably connected to the top surface of the inner cavity of the top cover, and the hexagonal disk is adapted to the inner hexagonal ring.

[0009] Preferably, the number of heat exchange tubes is several, and the several heat exchange tubes are evenly arranged. Both ends of each heat exchange tube are penetrated by an arc-shaped connecting pipe. A transfer pipe is penetrated on the side of the arc-shaped connecting pipe away from the heat exchange tube. A second connecting pipe is fixed at the end of the transfer pipe. A first tee pipe is fixed at the end of the second connecting pipe away from the transfer pipe. A third connecting pipe is fixed at the top of the first tee pipe. The end of the third connecting pipe away from the first tee pipe penetrates the bottom of the outer surface of the annular box.

[0010] Preferably, a bottom pipe extends through the lower surface of the water tank, the bottom pipe is connected to the inner cavity of the water tank, a second three-way pipe is fixed at the end of the bottom pipe, a drain valve is fixed at the bottom end of the second three-way pipe, and a water pump is fixed at the top end of the second three-way pipe.

[0011] Preferably, a fourth connecting pipe is fixedly installed at the drain end of the top of the water pump, and an inlet tank is fixedly installed at the end of the fourth connecting pipe away from the water pump. The inlet tank penetrates the top of the annular box and is connected to the annular box. An inlet valve penetrates the upper surface of the fourth connecting pipe, and the bottom end of the inlet valve is located in the inner cavity of the fourth connecting pipe. The bottom diameter of the inlet valve is smaller than the inner diameter of the fourth connecting pipe, and the bottom end of the inlet valve is located directly above the inlet tank.

[0012] Preferably, a guide ring is fixed on the inner wall of the annular box, and a plurality of drainage holes are formed on the surface of the guide ring. The number of guide rings is a plurality, and the plurality of guide rings are evenly distributed on the inner wall of the annular box.

[0013] This invention provides a waste heat recovery device for a carbon furnace. It has the following beneficial effects: I. The waste heat recovery device for this carbon furnace comprises two core chambers: a water tank and a gas tank. The water tank stores the heat exchange medium and serves as the terminal for heat absorption; the gas tank acts as the inlet and distribution chamber for hot waste gas, uniformly introducing the high-temperature flue gas from the carbon furnace into the heat exchange area. A first connecting pipe and connection port form the interface between the device and the carbon furnace exhaust system, safely and securely guiding the high-temperature, dust-laden flue gas into the gas tank. A fixed plate and an annular box provide an installation platform and peripheral chamber for the gas purification mechanism. The annular box surrounds the purification mechanism and stores the heat exchange medium.

[0014] Second, the waste heat recovery device of the carbon furnace, through the setting of a gas purification mechanism, is the "environmental protection core" of the device. It is responsible for purifying the high-temperature flue gas before heat recovery, removing pollutants such as dust and tar, preventing heat exchange tube blockage and corrosion, and ensuring long-term stable operation of the system.

[0015] Third, the waste heat recovery device of the carbon furnace, through the setting of a heat exchange mechanism, is the "energy conversion core" of the device. It uses the principle of heat exchange to transfer the heat of high-temperature flue gas to the water in the water tank, thereby raising the water temperature and realizing waste heat recovery.

[0016] IV. The waste heat recovery device of this carbon furnace, through the installation of heat exchange tubes, is a component that directly exchanges heat. These tubes pass through the connection between the gas tank and the water tank; the water to be heated flows inside the tubes, while the high-temperature flue gas flowing through the gas tank flows outside. An opening slot is provided on one side of the heat exchange tube within the water tank's inner cavity, allowing water from the tank to enter the heat exchange tube, achieving direct contact heat exchange or enhancing the heat exchange effect, thereby improving heat recovery efficiency.

[0017] V. The waste heat recovery device of this carbon furnace greatly increases the heat exchange area and improves the heat recovery efficiency by setting multiple evenly arranged heat exchange tubes. Multiple heat exchange tubes are connected in parallel by an arc-shaped connecting pipe to form a tube bundle, facilitating centralized water inlet and outlet. A circulation pipeline between the heat exchange tubes and the external water source is formed by a transfer pipe, a second connecting pipe, a first tee pipe, and a third connecting pipe. The third connecting pipe introduces liquid from the annular tank into the inner cavity of the water tank, where it is heated by the heat exchange tubes and then flows out through the pipeline on the other side. This design achieves forced circulation of the heat exchange medium between the tube bundle and the water tank, accelerating heat transfer. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the external structure of a waste heat recovery device for a carbon furnace according to the present invention. Figure 2 This is a cross-sectional structural schematic diagram of a waste heat recovery device for a carbon furnace according to the present invention. Figure 3 This is a partial structural schematic diagram of a waste heat recovery device for a carbon furnace according to the present invention; Figure 4 This is a schematic diagram of the gas purification mechanism of the present invention; Figure 5 This is a partial structural diagram of the gas purification mechanism of the present invention; Figure 6 This is a partial cross-sectional structural diagram of the gas purification mechanism of the present invention; Figure 7 This is a schematic diagram of the heat exchange mechanism of the present invention; Figure 8 This is a schematic diagram of the disassembled structure of the heat exchange mechanism of the present invention; Figure 9 This is a schematic diagram of the heat exchanger tube structure of the present invention; Figure 10 This is a schematic cross-sectional view of the heat exchange mechanism of the present invention; Figure 11 This is a schematic diagram of the cross-sectional structure of the annular box of the present invention.

[0019] In the diagram: 1. Connecting frame; 2. Water tank; 3. Gas box; 4. First connecting pipe; 5. Connecting port; 6. Fixing plate; 7. Annular box; 8. Gas purification mechanism; 81. Rolling bearing; 82. Rotating box; 83. Screening cylinder; 84. Inner hexagonal ring; 85. Top cover; 86. Fixing frame; 87. Stepper motor; 88. Rotating rod; 89. Hexagonal disk; 810. Adsorption ring; 9. Heat exchange mechanism; 91. Heat exchange tube; 92. Arc-shaped connecting pipe; 93. Transfer pipe; 94. Bottom pipe; 95. Second connecting pipe; 96. First tee pipe; 97. Third connecting pipe; 98. Second tee pipe; 99. Water pump; 910. Drain valve; 911. Fourth connecting pipe; 912. Liquid inlet tank; 913. Water inlet valve; 10. Guide ring. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0021] like Figures 1-11As shown, the present invention provides a technical solution: a waste heat recovery device for a carbon furnace, including a connecting frame 1, a water tank 2 welded to the upper surface of the connecting frame 1, a gas box 3 fixedly mounted on the upper surface of the water tank 2, a first connecting pipe 4 penetrating the outer side of the gas box 3, and a connecting port 5 welded to the end of the first connecting pipe 4 away from the gas box 3. The connecting port 5 is used to connect the device to the exhaust port of the carbon furnace. A fixing plate 6 is welded to the upper surface of the gas box 3, and an annular box 7 is fixedly mounted on the upper surface of the fixing plate 6. By setting the connecting frame 1, a stable mounting base is provided for the entire waste heat recovery device, ensuring that the equipment can be stably installed next to the carbon furnace or in a designated location. The water tank 2 and the gas box 3 constitute the two core cavities of the device. The water tank 2 is used to store the heat exchange medium water and is the terminal of heat absorption; the gas box 3 serves as the inlet and distribution cavity for hot waste gas, uniformly introducing the high-temperature flue gas from the carbon furnace into the heat exchange area. By setting the first connecting pipe 4 and the connecting port 5, an interface is formed between the device and the carbon furnace exhaust system, allowing the high-temperature, dust-laden flue gas to be safely and sealedly introduced into the gas box 3. By setting the fixing plate 6 and the annular box 7, an installation platform and peripheral cavity are provided for the gas purification mechanism 8. The annular box 7 surrounds the outside of the purification mechanism and is used to store the heat exchange medium water. It also includes: The gas purification mechanism 8 is used to purify the hot air extracted from inside the carbon furnace. The gas purification mechanism 8 is located directly above the gas box 3. By setting up the gas purification mechanism 8, it is the "environmental protection core" of the device. It is responsible for purifying the high-temperature flue gas before heat recovery, removing pollutants such as dust and tar, preventing the heat exchange tube 91 from clogging and corroding, and ensuring the long-term stable operation of the system. The heat exchange mechanism 9 is used to absorb heat from the hot air and is located between the water tank 2 and the air tank 3. The heat exchange mechanism 9 is the "energy conversion core" of the device. Utilizing the principle of heat exchange, it transfers the heat from the high-temperature flue gas to the water in the water tank 2, raising the water temperature and achieving waste heat recovery. The gas purification mechanism 8 includes a rolling bearing 81, which is fixed to the upper surface of the gas chamber 3. A rotating housing 82 is fixed to the inner ring of the rolling bearing 81. The bottom opening of the rotating housing 82 is aligned with the opening on the upper surface of the gas chamber 3, and the rotating housing 82 is connected to the gas chamber 3. By setting the rolling bearing 81, high-precision, low-friction rotational support is provided for the rotating housing 82, enabling it to rotate smoothly above the gas chamber 3. The rotating housing 82 serves as the rotation center of the gas purification mechanism 8, and its bottom opening communicates with the gas chamber 3, introducing flue gas from the gas chamber 3 into the rotating purification unit. The rotational movement of the rotating housing 82 is the basis for achieving dynamic purification.

[0022] A screen cylinder 83 is fixedly mounted on the outer surface of the rotating box 82. The outer surface of the screen cylinder 83 has several evenly distributed small holes. There are three screen cylinders 83, which are evenly distributed and connected to the rotating box 82. An inner hexagonal ring 84 is fixedly mounted on the upper surface of the rotating box 82. The screen cylinders 83 serve as the primary filtration unit for gas purification. The evenly distributed small holes on their outer surface form the first filtration barrier. When dust-containing flue gas enters the screen cylinder 83 from the rotating box 82, larger dust particles are blocked inside the cylinder or adhere to the cylinder wall, while cleaner gas is discharged through the small holes. The three evenly distributed screen cylinders 83 increase the filtration area, improving purification efficiency and throughput. The inner hexagonal ring 84 serves as the drive interface for the rotating box 82, engaging with the upper drive element hexagonal disk 89 to transmit power to the entire rotating assembly.

[0023] The gas purification mechanism 8 also includes a top cover 85, which is movably connected to the top of the annular box 7. An adsorption ring 810 is fixed to the lower surface of the top cover 85. This adsorption ring 810 is an annular adsorption cylinder with a notch, and the outer surface of the sieve cylinder 83 is frictionally fitted with the inner wall of the adsorption ring 810. By setting the top cover 85, the top of the annular box 7 is sealed, forming a relatively sealed purification chamber, and it also serves as a mounting base for the stepper motor 87 and the adsorption ring 810. Furthermore, the top cover 85 can be easily removed when internal cleaning is required. The adsorption ring 810 is a secondary fine filtration unit for gas purification. Its material constitutes a molecular sieve with adsorption capacity. During rotation, the outer surface of the sieve cylinder 83 maintains frictional contact with the inner wall of the adsorption ring 810. The gas, after initial filtration by the sieve cylinder 83, passes through the small holes and then through the adsorption layer of the adsorption ring 810 for further removal of fine dust, tar, and harmful gas components, achieving highly efficient purification. The notch design facilitates installation and replacement.

[0024] A mounting bracket 86 is fixed to the upper surface of the top cover 85. A stepper motor 87 is fixed to the inner wall of the mounting bracket 86. A rotating rod 88 is mounted on the output end of the stepper motor 87 via a coupling. A hexagonal disk 89 is fixed to the bottom end of the rotating rod 88. The hexagonal disk 89 is rotatably connected to the top surface of the inner cavity of the top cover 85 and is adapted to the inner hexagonal ring 84. The mounting bracket 86 provides a stable mounting platform for the stepper motor 87. The stepper motor 87, rotating rod 88, and hexagonal disk 89 constitute the drive system of the rotary purification unit. The stepper motor 87 provides controllable rotational power, which drives the hexagonal disk 89 to rotate via the rotating rod 88. The hexagonal disk 89 meshes with the inner hexagonal ring 84 on the rotating box 82, thereby driving the entire rotating box 82 and the screen cylinder 83 to rotate between the air box 3 and the adsorption ring 810. This driving method causes the screen cylinder 83 to continuously change its contact surface with the flue gas during rotation, preventing excessive dust accumulation in one place, while strengthening the frictional adsorption effect with the adsorption ring 810, achieving dynamic self-cleaning and efficient purification.

[0025] The heat exchange mechanism 9 includes a heat exchange tube 91, which passes through the connection between the gas box 3 and the water tank 2. The heat exchange tube 91 is tightly connected to both the gas box 3 and the water tank 2. An opening slot is provided on one side of the heat exchange tube 91 within the inner cavity of the water tank 2, connecting the water tank 2 to the inner cavity of the heat exchange tube 91. The heat exchange tube 91 is a direct heat exchange element. It passes through the connection between the gas box 3 and the water tank 2, with water to be heated flowing inside the tube and high-temperature flue gas flowing through the gas box 3 outside. The opening slot on one side of the heat exchange tube 91 within the inner cavity of the water tank 2 allows water from the water tank 2 to enter the heat exchange tube 91, achieving direct contact heat exchange or enhancing the heat exchange effect, thus improving heat recovery efficiency. The heat exchange tubes 91 are numerous and evenly arranged. Both ends of each heat exchange tube 91 are connected by an arc-shaped connecting pipe 92. A transfer pipe 93 passes through the side of the arc-shaped connecting pipe 92 furthest from the heat exchange tube 91. A second connecting pipe 95 is fixed to the end of the transfer pipe 93. A first tee pipe 96 is fixed to the end of the second connecting pipe 95 furthest from the transfer pipe 93. A third connecting pipe 97 is fixed to the top of the first tee pipe 96. The end of the third connecting pipe 97 furthest from the first tee pipe 96 penetrates the bottom of the outer surface of the annular box 7. By setting multiple evenly arranged heat exchange tubes 91, the heat exchange area is greatly increased, and the heat recovery efficiency is improved. The arc-shaped connecting pipes 92 connect the multiple heat exchange tubes 91 in parallel, forming a tube bundle, facilitating centralized water inlet and outlet. The transfer pipe 93, the second connecting pipe 95, the first tee pipe 96, and the third connecting pipe 97 constitute the circulation pipeline between the heat exchange tubes 91 and the external water source annular box 7. The third connecting pipe 97 introduces the liquid from the annular box 7 into the inner cavity of the water tank 2. After being heated by the heat exchange tube 91, the liquid flows out through the pipe on the other side. This design achieves forced circulation of the heat exchange medium between the tube bundle and the water tank, accelerating heat transfer.

[0026] A bottom pipe 94 runs through the lower surface of water tank 2, connecting to the inner cavity of water tank 2. A second three-way pipe 98 is fixed to the end of the bottom pipe 94, with a drain valve 910 fixed to the bottom end and a water pump 99 fixed to the top end. The bottom pipe 94 serves as the outlet for water in water tank 2, drawing out heated hot water. The second three-way pipe 98 divides the water flow into two paths: one downwards through the drain valve 910 for external use, and the other upwards to the water pump 99. The drain valve 910 controls the output of hot water, facilitating user access. The water pump 99 acts as the power source for water circulation, drawing hot water from the bottom of water tank 2 and pumping it to the inlet tank 912 at the top of the annular tank 7, forming a water circulation loop. This ensures a more uniform water temperature within water tank 2 and continuously supplies water to the annular tank 7.

[0027] A fourth connecting pipe 911 is fixedly installed at the drain end of the top of the water pump 99. An inlet tank 912 is fixedly installed at the end of the fourth connecting pipe 911 furthest from the water pump 99. The inlet tank 912 penetrates the top of the annular box 7 and is connected to the annular box 7. An inlet valve 913 penetrates the upper surface of the fourth connecting pipe 911. The bottom end of the inlet valve 913 is located within the inner cavity of the fourth connecting pipe 911, and its bottom diameter is smaller than the inner diameter of the fourth connecting pipe 911. The bottom end of the inlet valve 913 is directly above the inlet tank 912. The fourth connecting pipe 911 is used to transport hot water discharged from the water pump 99 to the inlet tank 912. The inlet tank 912 serves as the inlet for hot water to enter the annular box 7, acting as a water distributor and buffer. The inlet valve 913 is a special type of water supply or regulating valve. Its bottom diameter is smaller than the inner diameter of the fourth connecting pipe 911 and it is located directly above the inlet tank 912. This design allows the water to flow through the fourth connecting pipe 911, creating a Venturi effect or negative pressure around the bottom of the inlet valve 913. This automatically draws in external water sources, such as tap water, for mixing or replenishment, thus achieving automatic water replenishment or temperature regulation.

[0028] A guide ring 10 is fixed to the inner wall of the annular box 7. Several drainage holes are formed on the surface of the guide ring 10, and the guide rings 10 are evenly distributed along the inner wall of the annular box 7. The guide rings 10 serve as a water distribution and flow equalization device inside the annular box 7. The multiple guide rings 10 evenly distributed on the inner wall, with their drainage holes, can evenly spray or distribute the hot water entering from the inlet tank 912 onto the entire inner wall of the annular box 7. This is done to: firstly, utilize the large surface area of ​​the annular box 7 wall for heat exchange with the heat inside the annular box 7; and secondly, provide a more uniform preheating environment for the third connecting pipe 97 flowing outside the annular box 7, thus optimizing the thermal management of the entire system.

[0029] Working principle: The high-temperature dust-laden flue gas generated during carbon furnace production is introduced into the gas box 3 through the connection port 5 and the first connecting pipe 4. Subsequently, the flue gas enters the rotating box 82 of the gas purification mechanism 8. At the same time, the stepper motor 87 starts, driving the inner hexagonal ring 84 through the rotating rod 88 and the hexagonal disk 89, which in turn drives the rotating box 82 and the three screen cylinders 83 to rotate slowly.

[0030] Under the influence of centrifugal force and airflow, larger dust particles in the flue gas are blocked by the wall of the screen cylinder 83, with some adhering to the wall. The gas, after preliminary filtration, passes through the small holes of the screen cylinder 83 and enters the space between the screen cylinder 83 and the adsorption ring 810. As the screen cylinder 83 rotates, its outer surface comes into frictional contact with the inner wall of the adsorption ring 810. When the gas passes through this narrow area, fine dust, tar, and harmful gas components are captured by the adsorption material of the adsorption ring 810. The rotational motion continuously renews the surface of the screen cylinder 83, preventing dust from clogging the mesh and achieving dynamic self-cleaning and efficient purification. The purified high-temperature flue gas continues to flow downwards into the main space of the gas box 3. At this time, the water pump 99 starts, drawing cold water from the bottom of the water tank 2 through the bottom pipe 94, and sending it into the liquid inlet tank 912 through the second three-way pipe 98 and the fourth connecting pipe 911. The liquid inlet tank 912 evenly distributes the water into the annular box 7, and then evenly sprays it onto the inner wall of the annular box 7 through the drain hole of the guide ring 10.

[0031] Water flows out from the bottom of the annular tank 7 through the third connecting pipe 97, enters the first tee pipe 96, and then is distributed to each heat exchange tube 91 via the second connecting pipe 95, the transfer pipe 93, and the arc-shaped connecting pipe 92. The heat exchange tubes 91 penetrate the interior of the gas box 3, and the high-temperature flue gas flows past the outside of the tubes, transferring heat to the cold water inside. After being heated, the water is collected through the arc-shaped connecting pipe 92 at the other end of the heat exchange tube 91 and flows back to the water tank 2 through the pipeline. This cycle repeats continuously, and the water temperature in the water tank 2 continuously increases. Once the water in water tank 2 is heated to the set temperature, the drain valve 910 can be opened, and hot water can be drawn from the bottom of water tank 2 through the second three-way pipe 98 for production or domestic use. Simultaneously, the inlet valve 913 can be connected to an external water source. When the water pump 99 is running, the rapid water flow in the fourth connecting pipe 911 creates negative pressure at the bottom of the inlet valve 913, automatically drawing external cold water into the pipeline. This cold water mixes with the circulating hot water and enters the annular tank 7, achieving automatic water replenishment and maintaining system water balance and temperature stability.

[0032] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A waste heat recovery device for a carbon furnace, comprising a connecting frame (1), a water tank (2) welded to the upper surface of the connecting frame (1), a gas box (3) fixedly mounted on the upper surface of the water tank (2), a first connecting pipe (4) penetrating the outer side of the gas box (3), a connecting port (5) welded to the end of the first connecting pipe (4) away from the gas box (3), the connecting port (5) being used to connect the device to the exhaust port of the carbon furnace, a fixing plate (6) welded to the upper surface of the gas box (3), and an annular box (7) fixedly mounted on the upper surface of the fixing plate (6), characterized in that, Also includes: Gas purification mechanism (8) is used to purify the hot air extracted from inside the carbon furnace. The gas purification mechanism (8) is located directly above the gas box (3). A heat exchange mechanism (9) is used to absorb heat from hot air and is disposed between a water tank (2) and an air tank (3). The heat exchange mechanism (9) includes a heat exchange tube (91), which passes through the connection between the gas box (3) and the water tank (2). The heat exchange tube (91) is tightly connected to the gas box (3) and the water tank (2). The heat exchange tube (91) has an opening groove on one side of the inner cavity of the water tank (2), and the water tank (2) is connected to the inner cavity of the heat exchange tube (91).

2. The waste heat recovery device for a carbon furnace according to claim 1, characterized in that: The gas purification mechanism (8) includes a rolling bearing (81), which is fixed on the upper surface of the gas box (3). A rotating box (82) is fixed on the inner ring of the rolling bearing (81). The bottom opening of the rotating box (82) is aligned with the opening on the upper surface of the gas box (3). The rotating box (82) is connected to the gas box (3).

3. The waste heat recovery device for a carbon furnace according to claim 2, characterized in that: The outer surface of the rotating box (82) is fixedly provided with a screen cylinder (83). The outer surface of the screen cylinder (83) is provided with a number of evenly distributed small holes. There are three screen cylinders (83), and the three screen cylinders (83) are evenly distributed. The screen cylinder (83) is connected to the rotating box (82). The upper surface of the rotating box (82) is fixedly provided with an inner hexagonal ring (84).

4. The waste heat recovery device for a carbon furnace according to claim 3, characterized in that: The gas purification mechanism (8) also includes a top cover (85), which is movably connected to the top of the annular box (7). An adsorption ring (810) is fixed on the lower surface of the top cover (85). The adsorption ring (810) is an annular adsorption cylinder with a notch. The outer surface of the sieve cylinder (83) is rubbed against the inner wall of the adsorption ring (810).

5. The waste heat recovery device for a carbon furnace according to claim 4, characterized in that: A fixing frame (86) is fixed on the upper surface of the top cover (85). A stepper motor (87) is fixed on the inner wall of the fixing frame (86). A rotating rod (88) is installed at the output end of the stepper motor (87) through a coupling. A hexagonal disk (89) is fixed at the bottom end of the rotating rod (88). The hexagonal disk (89) is rotatably connected to the top surface of the inner cavity of the top cover (85). The hexagonal disk (89) is adapted to the inner hexagonal ring (84).

6. The waste heat recovery device for a carbon furnace according to claim 1, characterized in that: The number of heat exchange tubes (91) is several, and the several heat exchange tubes (91) are evenly arranged. Both ends of the heat exchange tubes (91) are penetrated by arc-shaped connecting pipes (92). A transfer pipe (93) is penetrated on the side of the arc-shaped connecting pipe (92) away from the heat exchange tubes (91). A second connecting pipe (95) is fixed at the end of the transfer pipe (93). A first tee pipe (96) is fixed at the end of the second connecting pipe (95) away from the transfer pipe (93). A third connecting pipe (97) is fixed at the top of the first tee pipe (96). The end of the third connecting pipe (97) away from the first tee pipe (96) penetrates the bottom of the outer surface of the annular box (7).

7. The waste heat recovery device for a carbon furnace according to claim 6, characterized in that: The lower surface of the water tank (2) is penetrated by a bottom pipe (94), which is connected to the inner cavity of the water tank (2). A second three-way pipe (98) is fixed at the end of the bottom pipe (94), a drain valve (910) is fixed at the bottom end of the second three-way pipe (98), and a water pump (99) is fixed at the top end of the second three-way pipe (98).

8. The waste heat recovery device for a carbon furnace according to claim 7, characterized in that: The top of the water pump (99) is fixed with a fourth connecting pipe (911). The end of the fourth connecting pipe (911) away from the water pump (99) is fixed with an inlet tank (912). The inlet tank (912) penetrates the top of the annular box (7) and is connected to the annular box (7). The upper surface of the fourth connecting pipe (911) is penetrated by an inlet valve (913). The bottom end of the inlet valve (913) is located in the inner cavity of the fourth connecting pipe (911). The bottom diameter of the inlet valve (913) is smaller than the inner diameter of the fourth connecting pipe (911). The bottom end of the inlet valve (913) is located directly above the inlet tank (912).

9. A waste heat recovery device for a carbon furnace according to claim 8, characterized in that: A guide ring (10) is fixed on the inner wall of the annular box (7). The surface of the guide ring (10) is provided with a number of drainage holes. The number of guide rings (10) is a number, and the number of guide rings (10) is evenly distributed on the inner wall of the annular box (7).

Images