Energy-saving and environment-friendly silicon steel annealing kiln

Abstract

The invention relates to an energy-saving and environment-friendly silicon steel annealing kiln, which belongs to the technical field of annealing kilns, and comprises a hollow annealing furnace shell and a transportation device arranged in the annealing furnace shell, the energy-saving and environment-friendly silicon steel annealing kiln further comprises a heating assembly, the heating assembly comprises a hollow radiant tube, an ignition unit and a combustion-supporting unit, the radiant tube is arranged in the annealing furnace shell, and the ignition unit is connected with the combustion-supporting unit. The radiant tube and the annealing furnace shell jointly form a sealed space, and the ignition unit is arranged in one end of the radiant tube and used for providing combustion gas for the sealed space and conducting ignition treatment on the combustion gas. The combustion-supporting unit comprises a heat exchange shaft, a communicating pipe and an air pump, one end of the heat exchange shaft is arranged in the sealed space at the other end of the radiant tube, the other end of the heat exchange shaft extends out of the annealing furnace shell and communicates with the air pump, and the two ends of the communicating pipe are connected with the ends, close to the ignition unit, of the heat exchange shaft and the radiant tube correspondingly.

Description

Technical Field

[0001] This invention belongs to the field of annealing kiln technology, specifically relating to an energy-saving and environmentally friendly silicon steel annealing kiln. Background Technology

[0002] Non-oriented silicon steel is the primary material for the rotor cores of electric motors and generators. When used in motor and generator rotor cores, non-oriented silicon steel is required to possess good magnetic properties, including low iron loss and high magnetic flux density. Therefore, to eliminate the magnetic properties of non-oriented silicon steel and its inherent structural stress, it is annealed in an annealing furnace.

[0003] For example, the utility model patent with patent authorization announcement number CN205893348U discloses a continuous annealing furnace for oriented silicon steel, which has a furnace head and a furnace body. A furnace door is installed at the front of the furnace head, and an inlet roller is provided at the bottom of the furnace door. A waste heat utilization device is installed between the furnace head and the furnace door. The waste heat utilization device includes a heating pipe arranged in a circuitous manner at the furnace mouth. A burning flame is installed inside the heating pipe to raise the temperature of the heating pipe. The heat from the heating pipe will radiate into the annealing furnace, thereby raising the temperature inside the annealing furnace and ultimately raising the temperature of the silicon steel, thus realizing the annealing treatment of silicon steel in the annealing furnace.

[0004] Based on the search of the aforementioned patent grant announcement numbers, and considering their shortcomings, the following was found: Existing annealing furnaces achieve continuous combustion of the flame within heating tubes by continuously applying combustion gases and air. However, since the air is at room temperature when it arrives at the heating tubes, the tubes need to transfer some heat to the air to increase its temperature, facilitating the subsequent mixing and combustion of the combustion gases and air. This process consumes more combustion gases to raise the air temperature, increasing the cost of annealing silicon steel. Furthermore, during the air heating process, some air that has not reached the required temperature mixes with the combustion gases, preventing complete combustion and resulting in the generation of large amounts of flue gas, which negatively impacts the environment. Summary of the Invention

[0005] To address the problem that existing annealing furnaces require additional combustion gases to raise the air temperature, thus increasing the cost of annealing silicon steel, and to further address the issue of the large amount of flue gas generated during combustion, which impacts the environment, this invention provides an energy-saving and environmentally friendly silicon steel annealing furnace.

[0006] The objective of this invention can be achieved through the following technical solutions: An energy-saving and environmentally friendly silicon steel annealing furnace includes a hollow annealing furnace shell and a transport device. The transport device is disposed inside the annealing furnace shell. The furnace also includes a heating assembly comprising a hollow radiant tube, an ignition unit, and a combustion-supporting unit. The radiant tube is disposed inside the annealing furnace shell, and the radiant tube and the annealing furnace shell together form a sealed space. The ignition unit is disposed at one end of the radiant tube and is used to provide combustion gas to the sealed space and ignite it. The combustion-supporting unit includes a heat exchange shaft, a connecting pipe, and a gas pump. One end of the heat exchange shaft is disposed inside the other end of the radiant tube, and the other end of the heat exchange shaft extends outside the annealing furnace shell and is connected to the gas pump. The two ends of the connecting pipe are respectively connected to the heat exchange shaft and the end of the radiant tube near the ignition unit.

[0007] As a preferred embodiment of the present invention, the ignition unit includes an internally hollow ignition shell, an igniter, a combustion tube, and a gas cylinder. The ignition shell is disposed outside the annealing furnace shell. The ignition shell and one end of the radiant tube are sealed and connected. The igniter is disposed inside the ignition shell. The two ends of the combustion tube are respectively connected to the ignition shell and the gas cylinder. The connecting pipe is connected to the ignition shell.

[0008] As a preferred embodiment of the present invention, the radiant tube includes four vertical rods and three arc-shaped rods. The four vertical rods are equally spaced along the axial direction of the annealing furnace shell, and there is an installation space between adjacent two vertical rods. The three arc-shaped rods and the three installation spaces are matched one-to-one. Any arc-shaped rod is set in the corresponding installation space, and the two ends of the arc-shaped rod are respectively connected to one end of the two adjacent vertical rods.

[0009] As a preferred embodiment of the present invention, it further includes an internally hollow heat exchange shell, which is disposed outside the annealing furnace shell. The two ends of the heat exchange shell are coaxially connected to the other end of the radiant tube and the flue gas particle removal device, respectively, and the heat exchange shaft is disposed inside the heat exchange shell.

[0010] As a preferred embodiment of the present invention, the heat exchange shaft includes a finned heat exchange tube and a heat exchange circular tube, an extension tube and a sealing tube coaxially connected. The finned heat exchange tube is disposed inside the other end of the radiant tube, and the heat exchange circular tube is disposed inside the heat exchange shell. The heat exchange circular tube and the finned heat exchange tube together form a heat exchange space, and the heat exchange space and the sealing space are not interconnected. The extension tube is disposed inside the heat exchange circular tube, and the other end of the extension tube extends into the finned heat exchange tube. The air pump is disposed on the heat exchange shell, and the sealing tube is disposed inside the sealing space. The two ends of the sealing tube are respectively sealed and connected to the output end of the air pump and the end of the extension tube near the heat exchange circular tube.

[0011] As a preferred embodiment of the present invention, the heat exchange circular tube is further provided with an output slot and an output ring. The output ring is coaxially disposed at one end of the heat exchange circular tube near the insertion tube. The two ends of the output slot are respectively connected to the heat exchange space and the output ring. The heat exchange circular tube is provided with a connecting hole, and the two ends of the connecting hole are respectively connected to the output ring and the connecting tube.

[0012] As a preferred embodiment of the present invention, the finned heat exchange tube includes a hollow finned tube body and a plurality of finned rings. The finned tube body is coaxially connected to one end of the heat exchange circular tube, and the plurality of finned rings are coaxially and rotatably disposed on the outer side wall of the finned tube body at equal intervals along the axial direction of the finned tube body.

[0013] As a preferred embodiment of the present invention, it further includes a plurality of flue gas removal components, which are matched one-to-one with a plurality of finned rings. Each flue gas removal component includes a plurality of abutment blocks, hinge blocks, and hinge springs. The plurality of abutment blocks are arranged at equal angles along the central axis of the corresponding finned rings on the sidewalls of the finned rings. The bottom end of the hinge block is hinged to the vertical rod at the end of the radiant tube. The two ends of the hinge spring are respectively connected to the hinge block and the vertical rod.

[0014] As a preferred embodiment of the present invention, the setting surface of the abutment block end face is inclined relative to the vertical surface of the vertical rod.

[0015] As a preferred embodiment of the present invention, the coefficient of thermal expansion of the finned tube body is greater than that of the finned ring.

[0016] The beneficial effects of this invention are as follows: With this setup, as the device operates, the overall temperature inside the radiant tube rises. At this time, the air pump transports air to the heat exchange shaft, which absorbs heat from the end of the radiant tube and transfers it to the air, causing the air temperature to rise. Then, the heated air enters the end of the radiant tube near the ignition unit through the connecting pipe. Therefore, as the device operates for longer, the temperature of the air entering the radiant tube increases, reducing the heat consumption of the radiant tube and thus decreasing combustion gas consumption. Simultaneously, as the air temperature rises, the combustion of the gases inside the radiant tube becomes more complete. It should be noted that more complete combustion results in fewer particulate matter particles released, facilitating subsequent particulate matter treatment and minimizing the environmental impact of the device. This addresses the problem that existing annealing furnaces rely on continuously applying combustion gas and air into the heating tube to maintain continuous flame combustion. However, since the air is still at room temperature when it is delivered to the heating tube, the heating tube needs to transfer some heat to the air to increase its temperature, which is necessary for the subsequent mixing and combustion of the combustion gas and air. However, this situation has two drawbacks. First, it consumes more combustion gas to raise the air temperature, increasing the cost of annealing silicon steel in the annealing furnace. Second, during the air heating process, some air that has not reached the required temperature will mix with the combustion gas and burn, preventing the combustion gas from burning completely. This results in a large amount of flue gas being produced during combustion, which affects the environment. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is an overall view of an energy-saving and environmentally friendly silicon steel annealing kiln of the present invention; Figure 2 This is a side view of an energy-saving and environmentally friendly silicon steel annealing kiln according to the present invention; Figure 3 This is a cross-sectional view of an energy-saving and environmentally friendly silicon steel annealing kiln according to the present invention; Figure 4 This is an internal top view of an energy-saving and environmentally friendly silicon steel annealing kiln according to the present invention; Figure 5 This is a diagram showing the internal structure of the radiant tube of an energy-saving and environmentally friendly silicon steel annealing furnace according to the present invention. Figure 6 This is a structural diagram of the heat exchange shaft of an energy-saving and environmentally friendly silicon steel annealing kiln according to the present invention; Figure 7 This is a composition diagram of the combustion-supporting unit of an energy-saving and environmentally friendly silicon steel annealing kiln according to the present invention; Figure 8This is a composition diagram of a flue gas removal component for an energy-saving and environmentally friendly silicon steel annealing kiln according to the present invention.

[0019] Explanation of main symbols In the diagram: 1. Annealing furnace shell; 2. Transport device; 3. Heating assembly; 301. Radiant tube; 3011. Vertical rod; 3012. Arc rod; 4. Ignition unit; 401. Ignition shell; 402. Igniter; 403. Combustion tube; 5. Combustion-supporting unit; 501. Heat exchange shaft; 5011. Finned heat exchange tube; 50111. Finned tube body; 50112. Finned ring; 5012. Heat exchange circular tube; 50121. Output slot; 50122. Output ring; 50123. Connecting hole; 502. Connecting pipe; 503. Air pump; 504. Insertion pipe; 505. Sealing pipe; 6. Flue gas removal assembly; 601. Abutment block; 602. Hinge block; 603. Hinge spring; 7. Heat exchange shell. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0021] Please see Figures 1-8This embodiment provides an energy-saving and environmentally friendly silicon steel annealing furnace, including an internally hollow annealing furnace shell 1 and a transport device 2. The transport device 2 is set inside the annealing furnace shell 1 and is used to transport silicon steel for movement, so as to realize the transport of silicon steel inside the annealing furnace shell 1. It should be noted that the annealing furnace shell 1 in this solution is a sealable space. It also includes a heating assembly 3, which comprises a hollow radiant tube 301, an ignition unit 4, and a combustion-supporting unit 5. The radiant tube 301 is disposed inside the annealing furnace shell 1, and the radiant tube 301 and the annealing furnace shell 1 together form a sealed space. The ignition unit 4 is disposed inside one end of the radiant tube 301 and is used to provide combustion gas to the sealed space and ignite the combustion gas. The combustion-supporting unit 5 includes a heat exchange shaft 501, a connecting pipe 502, and a gas pump 503. One end of the heat exchange shaft 501 is disposed inside the sealed space at the other end of the radiant tube 301, and the other end of the heat exchange shaft 501 extends outside the annealing furnace shell 1. The other end of the heat exchange shaft 501 is connected to the gas pump 503. The two ends of the connecting pipe 502 are respectively connected to the heat exchange shaft 501 and the end of the radiant tube 301 near the ignition unit 4. It should be noted that the function of the ignition unit 4 in this scheme is to provide combustion gas to the sealed space and ignite it to achieve the effect of combustion in the sealed space. The combustion-supporting unit 5 is used to provide air to the sealed space to ensure that the ignition unit 4 can work normally. It is worth noting that, along the direction of air flow in the radiant tube 301, the ignition unit 4 is located in front of the combustion-supporting unit 5. That is, the ignition unit 4 is located in the front end of the radiant tube 301, while the combustion-supporting unit 5 is located in the end of the radiant tube 301. In addition, the function of the air pump 503 is to deliver air into the heat exchange shaft 501. Along the direction of air flow in the heat exchange shaft 501, the air first moves to the end of the heat exchange shaft 501 that extends into the radiant tube 301, then moves to the connection between the heat exchange shaft 501 and the connecting pipe 502, and finally the air moves through the connecting pipe 502 to the end of the radiant tube 301 near the ignition unit 4. With this setup, as the device operates, the overall temperature inside the radiant tube 301 will rise. At this time, the air pump 503 transports air to the heat exchange shaft 501, and the heat exchange shaft 501 absorbs heat from the end of the radiant tube 301 and transfers the heat to the air, causing the air temperature to rise. Then, the heated air will enter the end of the radiant tube 301 near the ignition unit 4 through the connecting pipe 502.Therefore, as the device operates for longer periods, the air temperature entering the radiant tube 301 increases, resulting in less heat loss from the radiant tube 301 and reduced combustion gas consumption. Simultaneously, the increased air temperature leads to more complete combustion of the combustion gas within the radiant tube 301. This more complete combustion results in fewer particulate matter particles released, facilitating subsequent particulate matter treatment and minimizing the device's environmental impact. This addresses the problem of existing annealing furnaces relying on the continuous application of combustion gas and air within heating tubes to achieve flame generation. Continuous combustion occurs; however, since the air is still at room temperature when it is delivered to the heating tube, the heating tube needs to transfer some heat to the air to increase its temperature, facilitating the subsequent mixing and combustion of the combustion gas and air. However, this situation has two drawbacks: firstly, it consumes more combustion gas to raise the air temperature, increasing the cost of annealing silicon steel in the annealing furnace; secondly, during the air heating process, some air that has not reached the required temperature will mix and burn with the combustion gas, preventing the combustion gas from burning completely and resulting in a large amount of flue gas being produced during combustion, which affects the environment.

[0022] It should also be noted that in this design, the function of the radiant tube 301 is to heat the annealing furnace shell 1, facilitating the annealing of the silicon steel located inside the furnace shell 1. The end of the radiant tube 301 is connected to a particulate removal device located outside the furnace shell 1 to remove particulate matter generated inside the radiant tube 301. During actual operation, the temperature of the particulate matter exiting the end of the radiant tube 301 can reach as high as 800℃. At this temperature, the particulate matter easily forms sulfides, whose chemical properties can cause significant damage to human health and the environment. Therefore, the particulate matter exiting the end of the radiant tube 301 must be cooled to prevent the formation of sulfides. Therefore, the heat exchange shaft 501 of this scheme is set at the end of the radiant tube 301. On the one hand, it can heat up the air flowing to the front end of the radiant tube 301, improve the utilization rate of the waste heat of the radiant tube 301, and reduce the consumption of combustion gas and the generation of flue gas particles. On the other hand, it can reduce the temperature of the flue gas particles at the end of the radiant tube 301, and prevent the flue gas particles from generating sulfides, which would harm the environment and human safety.

[0023] Furthermore, the ignition unit 4 of this scheme includes an internally hollow ignition housing 401, an igniter 402, a combustion tube 403, and a gas canister. The ignition housing 401 is located outside the annealing furnace housing 1, and one end of the ignition housing 401 and the radiant tube 301 are sealed and connected. The igniter 402 is located inside the ignition housing 401. The two ends of the combustion tube 403 are respectively connected to the ignition housing 401 and the gas canister located outside the annealing furnace housing 1. The connecting pipe 502 is connected to the ignition housing 401. It should be noted that the combustion tube 403 of this scheme also integrates a one-way gas valve and a gas pump 503. The one-way gas valve is located inside the combustion tube 403. When the one-way gas valve is open, the gas pump 503 starts to work, controlling the gas in the gas canister to flow through the combustion tube 403 to the ignition housing 401. Similarly, when the one-way gas valve is closed, the gas in the gas canister cannot flow through the combustion tube 403 to the ignition housing 401. In addition, the one-way gas valve also has a one-way flow function, ensuring that gas can only flow from the gas cylinder to the ignition housing 401. The igniter 402 is responsible for igniting the gas inside the ignition housing 401 to achieve combustion.

[0024] Furthermore, the radiant tube 301 of this design includes four vertical rods 3011 and three arc-shaped rods 3012. The four vertical rods 3011 are equally spaced along the axial direction of the annealing furnace shell 1, and there is an installation space between adjacent two vertical rods 3011. The three arc-shaped rods 3012 and the three installation spaces are matched one-to-one. Each arc-shaped rod 3012 is set in the corresponding installation space, and the two ends of the arc-shaped rod 3012 are respectively connected to one end of the two adjacent vertical rods 3011. Through this arrangement, the radiant tube 301 of this design has an "M-shaped structure" in which it is rotated 90° and the two adjacent vertical rods 3011 are parallel to each other. In addition, in this structure, the two ends of the vertical rod 3011 at the front end of the radiant tube 301 are respectively connected to one end of the arc-shaped rod 3012 and the ignition shell 401; the two ends of the vertical rod 3011 at the end of the radiant tube 301 are respectively connected to one end of the other arc-shaped rod 3012 and the combustion unit 5. It should also be noted that commercially available radiant tubes 301 typically come in "V" shape, "N" shape, "M" shape, and multiple interconnected "M" shapes, while the radiant tube 301 in this design is only suitable for an "M" shape. The reason is as follows: the silicon steel used in this design for annealing is long and narrow. Since the function of the radiant tube 301 is to anneal the silicon steel, the length of the vertical rod 3011 is equal to the width of the transport device 2. To ensure the heating speed of the radiant tube 301 by the ignition unit 4, the igniter 402 of the ignition unit 4 typically produces a relatively long flame during combustion within the radiant tube 301. To prevent the flame from affecting the structure of the heat exchange shaft 501, the actual design of the radiant tube 301 requires at least two arc-shaped rods 3012 between the ignition unit 4 and the combustion-supporting unit 5. Therefore, a "V" shape is not suitable for the radiant tube 301 structure in this design. Furthermore, the temperature rise of the air inside the heat exchange shaft 501 is directly proportional to the time the air stays in the heat exchange shaft 501 near the radiant tube 301. The normal operation of the ignition unit 4 also requires that the amount of air flowing into the ignition housing 401 per unit time reaches a certain level. Therefore, while ensuring that the path between the heat exchange shaft 501 and the ignition housing 401 remains unchanged, it is necessary to increase the length of the heat exchange shaft 501 extending into the end of the radiant tube 301 as much as possible and reduce the length of the connecting pipe 502. Therefore, neither the "N" shape nor the "multi-M" shape structure is suitable for the radiant tube 301 structure of this scheme.

[0025] It is worth noting that the heating components 3 in this scheme are provided in several ways, and the heating components 3 are arranged at equal intervals in the annealing furnace shell 1 along the axial direction of the annealing furnace shell 1.

[0026] Specifically, the combustion-supporting unit 5 in this scheme also includes a hollow heat exchange shell 7, which is located outside the annealing furnace shell 1. Both ends of the heat exchange shell 7 are coaxially connected to the other end of the radiant tube 301 and the particulate removal device, respectively. The heat exchange shaft 501 is located inside the heat exchange shell 7, preventing any portion of the heat exchange shaft 501 exposed outside the annealing furnace shell 1 from posing a safety hazard to workers in the workshop. It is worth noting that in this scheme, one end of the radiant tube 301 specifically refers to the front end of the radiant tube 301, and the ignition unit 4 is located inside one end of the radiant tube 301; the other end of the radiant tube 301 specifically refers to the rear end of the radiant tube 301, and the combustion-supporting unit 5 is located inside the other end of the radiant tube 301.

[0027] Specifically, the heat exchange shaft 501 of this scheme includes a finned heat exchange tube 5011 and a heat exchange circular tube 5012 coaxially connected, an insertion tube 504 and a sealing tube 505. The finned heat exchange tube 5011 is coaxially disposed inside the other end of the radiant tube 301, and the heat exchange circular tube 5012 is coaxially disposed inside the heat exchange shell 7. One end of the heat exchange circular tube 5012 is coaxially connected to the finned heat exchange tube 5011. The interiors of the heat exchange circular tube 5012 and the finned heat exchange tube 5011 together form The heat exchange space and the sealed space are not interconnected. An insertion tube 504 is located within the heat exchange space, with one end coaxially positioned inside the heat exchange circular tube 5012, and the other end extending into the finned heat exchange tube 5011. The other end of the insertion tube 504 extends as far into the finned heat exchange tube 5011 as possible, but the end face of the insertion tube 504 and the inner end face of the finned heat exchange tube 5011 do not coincide. An air pump 503 is located within the heat exchange shell. On body 7, a sealing tube 505 is disposed within a sealed space, and both ends of the sealing tube 505 are respectively sealed and connected to the output end of the air pump 503 and the end of the extension tube 504 near the heat exchange circular tube 5012; in addition, the heat exchange circular tube 5012 is also provided with a plurality of output slots 50121 and output rings 50122, the output rings 50122 are coaxially disposed at the end of the heat exchange circular tube 5012 near the extension tube 504, the plurality of output slots 50121 are uniformly disposed at equal angles within the heat exchange circular tube 5012 along the central axis of the heat exchange circular tube 5012, the central axis of the output slots 50121 and the central axis of the heat exchange circular tube 5012 are parallel to each other, and both ends of the output slots 50121 are respectively connected to the heat exchange space and the output rings 50122; the heat exchange circular tube 5012 is provided with a connecting hole 50123, and both ends of the connecting hole 50123 are respectively connected to the output rings 50122 and the connecting tube 502.

[0028] With this setup, after the air pump 503 starts working, air flows through the inlet pipe 504 into the finned heat exchange tube 5011. Then, the air inside the finned heat exchange tube 5011 flows through the outlet slot 50121 into the outlet ring 50122, and finally moves through the connecting pipe 502 into the radiant tube 301. It should be noted that because the end of the inlet pipe 504 closest to the finned heat exchange tube 5011 extends as far into the tube as possible, the travel distance of the air from the finned heat exchange tube 5011 to the outlet slot 50121 is approximately equal to the overall length of the finned heat exchange tube 5011. This ensures that the air can absorb as much heat as possible within the finned heat exchange tube 5011, raising its temperature.

[0029] Furthermore, it should be noted that during the movement of air within the inlet tube 504, the air first absorbs heat from the heat exchange tube 5012. After the air moves out of the inlet tube 504, the air temperature rises from room temperature to 100°C, which is defined as the first heat absorption of the air. During the movement of air from the finned heat exchange tube 5011 to the outlet slot 50121, the air absorbs heat from the finned heat exchange tube 5011. After the air moves into the outlet slot 50121, the air temperature rises to 300°C, which is defined as the second heat absorption of the air.

[0030] It should also be noted that the heat on the heat exchanger tube 5012 is mainly formed by absorbing the heat inside the radiant tube 301. Since only one end of the heat exchanger tube 5012 is located inside the radiant tube 301, the heat provided by the heat exchanger tube 5012 to the air in the heat exchange space is limited. On the other hand, the finned heat exchanger tube 5011 is entirely located inside the radiant tube 301. In addition to absorbing the heat inside the radiant tube 301, the finned heat exchanger tube 5011 also absorbs the heat from the flue gas particles inside the radiant tube 301. Therefore, the finned heat exchanger tube 5011 provides more heat to the air in the heat exchange space than the heat provided by the heat exchanger tube 5012.

[0031] As described in the above embodiments, the finned heat exchange tube 5011 can absorb heat from flue gas particles, thereby reducing the temperature of the flue gas particles and preventing them from becoming too hot. When excessively hot flue gas particles move out of the radiant tube 301, they are prone to producing sulfides. Therefore, to achieve the structural effect of the finned heat exchange tube 5011 absorbing flue gas particles, this solution includes a hollow finned tube body 50111 and several finned rings 50112. The finned tube body 50111 is coaxially connected to one end of the heat exchange circular tube 5012. Several finned rings 50112 are coaxially and equally spaced along the axial direction of the finned tube body 50111 on the outer wall of the finned tube body 50111. By setting the finned rings 50112, the finned tube body 50111 effectively absorbs heat from flue gas particles, thus reducing the temperature of the flue gas particles. The increased contact area between the heat exchange tube 5011 and the sealed space allows it to absorb more heat from the radiant tube 301. Furthermore, the addition of the finned ring 50112 increases the cross-sectional area of ​​the finned heat exchange tube 5011. This allows the flue gas particles to be intercepted by the finned ring 50112 when they reach the end of the radiant tube 301, thus enabling the flue gas particles to come into contact with the finned ring 50112. Consequently, the heat from the flue gas particles is transferred to the finned ring 50112, resulting in a reduction in the temperature of the flue gas particles.

[0032] It should be noted that, in order to ensure that flue gas particles adhere to any one of the finned rings 50112, the outer diameter of the finned ring 50112 in this design gradually increases along the airflow direction within the radiant tube 301; and the area of ​​each subsequent finned ring 50112 is equal to the area of ​​the preceding finned ring 50112 plus the area of ​​the foremost finned ring 50112. This arrangement ensures that flue gas particles can adhere uniformly to any one of the finned rings 50112.

[0033] As described in the above embodiments, in this solution, flue gas particles may adhere to the finned ring 50112. As the number of flue gas particles adhering to the same finned ring 50112 increases, subsequent flue gas particles cannot directly adhere to the finned ring 50112, but instead adhere to the original flue gas particles. This prevents the heat from the subsequent flue gas particles from being transferred to the finned ring 50112 immediately, reducing the heat absorption efficiency of the finned ring 50112. Therefore, in this solution, the finned ring 50112 is rotatably and coaxially mounted on the side wall of the finned tube body 50111. It also includes several flue gas removal components 6, which correspond one-to-one with the finned rings 50112. Each flue gas removal component 6 includes several abutment blocks 601, hinge blocks 602, and hinge springs 603. The abutment blocks 601 are angularly positioned along the central axis of the corresponding finned ring 50112. On the side wall of 12, the intersection point formed by the central axes of each abutment block 601 is located on the central axis of the finned tube body 50111; the hinge block 602 is disposed inside the vertical rod 3011 at the end of the radiant tube 301, the bottom of the hinge block 602 is hinged to the inner wall of the vertical rod 3011, the hinge spring 603 is disposed inside the vertical rod 3011, and the two ends of the hinge spring 603 are respectively connected to the hinge block 602 and the vertical rod 3011, and the hinge... Block 602 can lock or release its engagement with any abutting block 601. With this configuration, when the fin ring 50112 rotates, when any abutting block 601 rotates to the bottom, it will collide with the hinge block 602, causing the fin ring 50112 to vibrate and dislodge the flue gas particles adhering to it, ensuring that no more flue gas particles remain on the fin ring 50112. After the abutting block 601 collides with the hinge block 602, the hinge block 602 will rotate, releasing its engagement with the abutting block 601, allowing the fin ring 50112 to continue rotating. Under the force of the hinge spring 603, the hinge block 602 returns to its original position. By setting up a number of abutment blocks 601, when the fin ring 50112 rotates, it can impact and vibrate various parts of the fin ring 50112 to ensure that no flue gas particles are attached to any part of the fin ring 50112.

[0034] According to the description of the above embodiment, in order to realize the rotation of the fin ring 50112, the setting surface of the end face of the abutment block 601 is inclined at a certain angle relative to the vertical surface of the vertical rod 3011. However, the setting surface of the end face of the abutment block 601 does not coincide with or is perpendicular to the vertical surface of the vertical rod 3011. With this setting, when the air pump 503 drives the air flow speed to a certain level, the abutment block 601 will drive the fin ring 50112 to rotate due to the setting angle of the abutment block 601. The structure here can be referred to as the fan blade structure principle of the wind turbine.

[0035] As described in the above embodiments, the flue gas removal component 6 in this solution needs to operate during the period when the ignition unit 4 is not in operation. This is because during the operation of the ignition unit 4, it is necessary to ensure that the flue gas particles adhere to the finned ring 50112, so that the temperature of the flue gas particles decreases while improving the utilization efficiency of the waste heat of the combustion unit 5. Therefore, the flue gas removal component 6 needs to stop operating during the operation of the device. Based on this, the coefficient of thermal expansion of the finned tube body 50111 in this solution is greater than that of the finned ring 50112. With this expansion coefficient, when the ignition unit 4 is working, the outer diameter expansion dimension of the finned tube body 50111 is greater than the inner diameter expansion dimension of the finned ring 50112, so that the finned tube body 50111 and the finned ring 50112 are in an interference fit, which restricts the finned ring 50112 from rotating. Only when the temperature of the radiant tube 301 approaches room temperature and the air force of the air pump 503 reaches a certain level will the finned ring 50112 rotate relative to the finned tube body 50111.

[0036] In actual operation, due to the length limitation of the radiant tube 301, only two finned rings 50112 can be installed in this solution. Furthermore, as described in the above embodiment, the finned ring 50112 rotates because the force of the wind on the abutment block 601 causes the abutment block 601 to rotate, thereby enabling the finned ring 50112 to rotate. Additionally, it should be noted that after the foremost finned ring 50112 rotates under the influence of wind, the wind force weakens after passing through it, preventing the remaining wind force from driving the rearmost finned ring 50112. Therefore, to solve this... To address the aforementioned issues, this solution reduces the friction between the finned ring 50112 and the finned tube body 50111 along the direction of airflow through the finned tube body 50111. This design ensures that the force required for the finned ring 50112 at the rear end to rotate is less than that required for the finned ring 50112 at the front end. In actual operation, after the airflow from the air pump 503 passes through the foremost finned ring 50112, although the foremost finned ring 50112 can rotate, its rotation speed is relatively slow. Consequently, more airflow from the air pump 503 passes through the rearmost finned ring 50112, causing it to rotate.

[0037] It is worth noting that the workflow of this solution is as follows: First, the air pump 503 starts working, continuously injecting air into the radiant tube 301. Then, the ignition unit 4 also starts working, injecting combustion gas into the radiant tube 301. Through ignition, a flame is generated inside the radiant tube 301, which burns the interior of the radiant tube 301 and increases its temperature. As the temperature of the radiant tube 301 continues to rise, the heat from the radiant tube 301 is transferred to the finned heat exchange tube 5011 and heat exchange circular tube 5012 located at the end of the radiant tube 301. Since the air pump 503 passes through the finned heat exchange tube 5011 and heat exchange circular tube 5012 before injecting air into the radiant tube 301, the air temperature is increased after passing through the finned heat exchange tube 5011 and heat exchange circular tube 5012. After the radiant tube 301 raises the temperature inside the annealing furnace shell 1 to the specified temperature, the transport device 2 starts working, controlling the movement of the silicon steel and realizing the annealing process.

[0038] During this period, due to the rise in air temperature, the combustion gas in the radiant tube 301 will become more and more complete, and the number of flue gas particles will become less and less. At the same time, since the finned heat exchange tube 5011 and the heat exchange circular tube 5012 are located at the end of the radiant tube 301, the waste heat utilization efficiency of the radiant tube 301 can also be improved.

[0039] In addition, when the flue gas particles generated in the radiant tube 301 pass through the finned heat exchange tube 5011, the flue gas particles will adhere to the finned heat exchange tube 5011, further reducing the temperature of the flue gas particles and preventing the flue gas particles from being too hot and easily generating sulfides, which would affect the environment.

[0040] As the device is used more frequently, more and more flue gas particles will adhere to the finned heat exchange tube 5011, which will affect the subsequent adhesion of flue gas particles to the finned heat exchange tube 5011 and the subsequent heat transfer effect of the flue gas particles to the finned heat exchange tube 5011. Therefore, when the device is at room temperature, the air pump 503 needs to be controlled to work. After the air force provided by the air pump 503 reaches a certain level, the finned ring 50112 set on the finned tube body 50111 starts to rotate, which in turn drives the abutment block 601 to collide with the hinge block 602, so that the flue gas particles attached to the finned ring 50112 and the abutment block 601 are detached, ensuring that the device can continue to work normally.

[0041] It is worth noting that, because the coefficient of thermal expansion of the finned tube body 50111 in this design is greater than that of the finned ring 50112, the finned ring 50112 cannot rotate when the temperature inside the radiant tube 301 is high. Furthermore, it should be noted that during operation, as the temperature inside the radiant tube 301 reaches the designated temperature, the time it takes for the air pumped into the finned heat exchange tube 5011 to rise to the designated temperature becomes increasingly shorter. Therefore, the air pump 503 can increase its operating speed to accelerate airflow, thereby increasing the air's force. Thus, by setting the coefficient of thermal expansion of the finned tube body 50111 to be greater than that of the finned ring 50112, it is ensured that the finned ring 50112 cannot rotate when the device is at high temperatures.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An energy-saving and environmentally friendly silicon steel annealing furnace, comprising an internally hollow annealing furnace shell and a transport device, wherein the transport device is disposed within the annealing furnace shell, characterized in that: It also includes a heating assembly, which comprises a hollow radiant tube, an ignition unit, and a combustion-supporting unit. The radiant tube is disposed inside the annealing furnace shell, and the radiant tube and the annealing furnace shell together form a sealed space. The ignition unit is disposed inside one end of the radiant tube and is used to provide combustion gas to the sealed space and ignite it. The combustion-supporting unit includes a heat exchange shaft, a connecting pipe, and a gas pump. One end of the heat exchange shaft is disposed inside the other end of the radiant tube, and the other end of the heat exchange shaft extends outside the annealing furnace shell and is connected to the gas pump. The two ends of the connecting pipe are respectively connected to the heat exchange shaft and the end of the radiant tube near the ignition unit.

2. The energy-saving and environmentally friendly silicon steel annealing furnace according to claim 1, characterized in that: The ignition unit includes an internally hollow ignition shell, an igniter, a combustion tube, and a gas cylinder. The ignition shell is disposed outside the annealing furnace shell. The ignition shell and one end of the radiant tube are sealed and connected. The igniter is disposed inside the ignition shell. The two ends of the combustion tube are respectively connected to the ignition shell and the gas cylinder. The connecting pipe is connected to the ignition shell.

3. The energy-saving and environmentally friendly silicon steel annealing kiln according to claim 1, characterized in that: The radiant tube includes four vertical rods and three arc-shaped rods. The four vertical rods are equally spaced along the axial direction of the annealing furnace shell, and there is an installation space between adjacent two vertical rods. The three arc-shaped rods and three installation spaces are matched one-to-one. Any arc-shaped rod is set in the corresponding installation space, and the two ends of the arc-shaped rod are respectively connected to one end of the two adjacent vertical rods.

4. The energy-saving and environmentally friendly silicon steel annealing kiln according to claim 3, characterized in that: It also includes an internally hollow heat exchange shell, which is disposed outside the annealing furnace shell. The two ends of the heat exchange shell are coaxially connected to the other end of the radiant tube and the flue gas particle removal device, respectively, and the heat exchange shaft is disposed inside the heat exchange shell.

5. The energy-saving and environmentally friendly silicon steel annealing kiln according to claim 4, characterized in that: The heat exchange shaft includes a finned heat exchange tube and a heat exchange circular tube, an extension tube, and a sealing tube coaxially connected. The finned heat exchange tube is disposed inside the other end of the radiant tube, and the heat exchange circular tube is disposed inside the heat exchange shell. The heat exchange circular tube and the finned heat exchange tube together form a heat exchange space, and the heat exchange space and the sealing space are not interconnected. The extension tube is disposed inside the heat exchange circular tube, and the other end of the extension tube extends into the finned heat exchange tube. The air pump is disposed on the heat exchange shell, and the sealing tube is disposed inside the sealing space. The two ends of the sealing tube are respectively sealed and connected to the output end of the air pump and the end of the extension tube near the heat exchange circular tube.

6. The energy-saving and environmentally friendly silicon steel annealing kiln according to claim 5, characterized in that: The heat exchange tube is also provided with an output slot and an output ring. The output ring is coaxially disposed at one end of the heat exchange tube near the insertion tube. The two ends of the output slot are respectively connected to the heat exchange space and the output ring. The heat exchange tube is provided with a connecting hole. The two ends of the connecting hole are respectively connected to the output ring and the connecting tube.

7. The energy-saving and environmentally friendly silicon steel annealing kiln according to claim 5, characterized in that: The finned heat exchange tube includes a hollow finned tube body and several finned rings. The finned tube body is coaxially connected to one end of the heat exchange circular tube. The several finned rings are coaxially and rotatably arranged on the outer wall of the finned tube body at equal intervals along the axial direction of the finned tube body.

8. The energy-saving and environmentally friendly silicon steel annealing kiln according to claim 7, characterized in that: It also includes several flue gas removal components, which are matched one-to-one with several finned rings. Each flue gas removal component includes several abutment blocks, hinge blocks, and hinge springs. Several abutment blocks are arranged at equal angles along the central axis of the corresponding finned ring on the side wall of the finned ring. The bottom end of the hinge block is hinged to the vertical rod at the end of the radiant tube. The two ends of the hinge spring are respectively connected to the hinge block and the vertical rod.

9. The energy-saving and environmentally friendly silicon steel annealing kiln according to claim 8, characterized in that: The end face of the abutment block is inclined relative to the vertical face of the vertical rod.

10. The energy-saving and environmentally friendly silicon steel annealing kiln according to claim 7, characterized in that: The coefficient of thermal expansion of the finned tube body is greater than that of the finned ring.

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