Silicon steel hot rolling normalizing annealing furnace structure

Abstract

The utility model relates to the technical field of silicon steel production equipment, and discloses a silicon steel hot rolling normalizing annealing furnace structure which comprises a furnace body, a heating cavity and a heat insulation cavity are formed in the furnace body, a heating assembly is installed in the heating cavity and comprises an electromagnetic induction heating coil, a gas pipe and a plurality of combustion heads, and the gas pipe is fixedly connected to the outer wall of the furnace body; according to the waste heat recovery device, high-temperature waste gas generated in the annealing process is subjected to efficient heat recovery through the arranged waste heat recovery assembly, after the waste gas enters the waste heat recovery box, the heat is transmitted to a medium in the box through the heat conduction plate, the medium circulates under the action of the water pump, and the heat is conveyed into the heat exchanger to be used for preheating air; according to the annealing furnace, waste heat is recycled, dependence on energy such as fuel gas and electric power is reduced, energy consumption is reduced, the energy utilization efficiency is remarkably improved, the problem of energy waste of a traditional annealing furnace is effectively solved, and the production cost of an enterprise is reduced.

Description

Technical Field

[0001] This application relates to the technical field of silicon steel production equipment, and in particular to the structure of silicon steel hot rolling normalizing annealing furnace. Background Technology

[0002] In the production of silicon steel, hot rolling normalizing annealing is a key process. Its purpose is to improve the microstructure and properties of silicon steel through heating to meet the requirements of subsequent processing and product quality. Traditional silicon steel hot rolling normalizing annealing furnaces have problems such as low energy utilization and serious waste of waste heat during operation.

[0003] Annealing furnaces consume a large amount of energy, such as gas and electricity, when heating silicon steel. However, the large amount of high-temperature waste gas generated during the annealing process is usually directly discharged into the atmosphere. These waste gases contain a large amount of heat energy, and direct discharge not only causes a huge waste of energy but also increases the production costs of enterprises and causes thermal pollution to the environment. Therefore, a structure for silicon steel hot rolling normalizing annealing furnaces is proposed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a structure for a silicon steel hot rolling normalizing annealing furnace, which solves the problems of low energy utilization and serious waste of waste heat in traditional annealing furnaces.

[0005] The silicon steel hot-rolled normalizing annealing furnace structure provided in this application adopts the following technical solution:

[0006] The structure of a silicon steel hot rolling normalizing annealing furnace includes a furnace body, the interior of which is provided with a heating chamber and a heat insulation chamber. A heating assembly is installed inside the heating chamber. The heating assembly includes an electromagnetic induction heating coil, a gas pipe and multiple burners. The electromagnetic induction heating coil is evenly distributed on the inner wall of the heating chamber. The gas pipe is fixedly connected to the outer wall of the furnace body. The multiple burners penetrate the furnace body and are connected to the gas pipe.

[0007] An air intake assembly is installed on the outer wall of the furnace body. The air intake assembly includes a blower, a heat exchanger, an air intake pipe, and multiple air intake nozzles. The air intake end of the blower is connected to the heat exchanger, and the end of the heat exchanger away from the blower is connected to the air intake pipe. The air intake pipe is fixedly connected to the outer wall of the furnace body. The multiple air intake nozzles are connected to the air intake pipe and penetrate the furnace body and are located inside the heating chamber.

[0008] The outer wall of the furnace body is equipped with a waste heat recovery assembly, which includes a waste heat recovery box and an exhaust pipe. The exhaust pipe is located on the top outer wall of the furnace body. The waste heat recovery box is connected to the heating chamber inside the furnace body through the exhaust pipe. A partition plate is fixedly connected to the inner wall of the waste heat recovery box, and multiple heat-conducting plates are fixedly connected to the outer wall of the partition plate.

[0009] Preferably, the heat exchanger is fixedly installed on the outer wall of the furnace body by a bracket, and a heat insulation cover is fixedly connected to the outer wall of the heat exchanger. Multiple heat-spreading fins are embedded in the inner wall of the heat insulation cover. The multiple heat-spreading fins penetrate and extend into the interior of the heat exchanger. A heat exchange tube is installed between the heat exchanger and the heat insulation cover. The heat exchange tube is spirally wound between the heat exchanger and the heat insulation cover, and the heat exchange tube penetrates the multiple heat-spreading fins.

[0010] Preferably, a water outlet pipe is installed on one side of the outer wall of the waste heat recovery box, and a water inlet is provided on its front outer wall. The water outlet pipe is located below the partition plate, and one end of the heat exchange pipe is connected to the inner cavity of the waste heat recovery box located below the partition plate through the water outlet pipe.

[0011] Preferably, a water pump is fixedly installed on one side of the outer wall of the waste heat recovery box, the water pump's pumping end extends into the bottom inner cavity of the waste heat recovery box, and the water pump's delivery end is connected to the other end of the heat exchange pipe through a water inlet pipe.

[0012] Preferably, the outer wall of one side of the waste heat recovery box is provided with multiple exhaust holes, and the multiple exhaust holes are located above the partition plate.

[0013] Preferably, the furnace body is fixedly connected to a placement platform above the heat insulation cavity.

[0014] Preferably, the outer wall of the furnace body is provided with a feed inlet, and the outer wall of the feed inlet is rotatably connected to a sealing door via a hinge.

[0015] In summary, this application includes the following beneficial technical effects:

[0016] By setting up waste heat recovery components, the high-temperature waste gas generated during the annealing process is efficiently recovered. After the waste gas enters the waste heat recovery box, the heat is transferred to the medium (such as water) inside the box through the heat conduction plate. The medium circulates under the action of the water pump, and the heat is transported to the heat exchanger for preheating the air, realizing the recycling of waste heat. This not only reduces the dependence on energy sources such as gas and electricity and reduces energy consumption, but also significantly improves energy utilization efficiency, effectively solves the problem of energy waste in traditional annealing furnaces, and reduces the production costs of enterprises. Attached Figure Description

[0017] Figure 1 This is an overall schematic diagram of an embodiment of the application;

[0018] Figure 2 This is a three-dimensional schematic diagram of an embodiment of the application;

[0019] Figure 3 This is a partial cross-sectional view of the waste heat recovery box in the embodiment of the application;

[0020] Figure 4 This is a partial sectional view of the furnace body in the embodiment of the application;

[0021] Figure 5 This is an exploded schematic diagram of the heat exchanger in the application embodiment;

[0022] Figure 6 This is an exploded cross-sectional view of the heat exchanger in the application embodiment.

[0023] Explanation of reference numerals in the attached drawings: 1. Furnace body; 2. Gas pipe; 3. Burner head; 4. Electromagnetic induction heating coil; 5. Air inlet pipe; 6. Air inlet nozzle; 7. Heat exchange pipe; 8. Placement platform; 9. Sealing door; 10. Feed inlet; 11. Waste heat recovery box; 12. Partition plate; 13. Heat conduction plate; 14. Exhaust gas pipe; 15. Water inlet; 16. Water pump; 17. Water inlet pipe; 18. Water outlet pipe; 19. Exhaust vent; 20. Support frame; 21. Blower; 22. Heat exchanger; 23. Heat insulation cover; 24. Heat soaking fins. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0025] This application discloses the structure of a silicon steel hot-rolled normalizing annealing furnace. (Refer to...) Figure 1-6 The structure of the silicon steel hot rolling normalizing annealing furnace includes a furnace body 1. The furnace body 1 adopts a special design, which has a heating chamber and a heat insulation chamber inside. The heat insulation chamber can effectively reduce the heat loss to the outside and improve the energy utilization efficiency. A placement platform 8 is fixedly connected above the heat insulation chamber. The placement platform 8 is used to place silicon steel workpieces.

[0026] The outer wall of the furnace body 1 is provided with a feed inlet 10. The outer wall of the feed inlet 10 is connected to a sealing door 9 by a hinge. When performing silicon steel annealing, the sealing door 9 is opened, the silicon steel to be annealed is placed on the placement platform 8, and then the sealing door 9 is closed to ensure the sealing of the heating chamber and prevent heat leakage.

[0027] The heating assembly is installed inside the heating chamber and mainly includes an electromagnetic induction heating coil 4, a gas pipe 2, and multiple burners 3. The electromagnetic induction heating coil 4 is evenly distributed on the inner wall of the heating chamber. Utilizing the principle of electromagnetic induction, it can heat silicon steel quickly and efficiently. Compared with traditional heating methods, it has significant advantages in terms of fast heating speed and high efficiency.

[0028] The gas pipe 2 is fixedly connected to the outer wall of the furnace body 1. Multiple burners 3 pass through the furnace body 1 and are connected to the gas pipe 2. When auxiliary heating is required, the gas is delivered to the burner 3 through the gas pipe 2 and ignited, providing additional heat for the annealing of silicon steel. In actual production, the working state of the electromagnetic induction heating coil 4 and the burner 3 can be flexibly adjusted according to different annealing process requirements to achieve the best heating effect.

[0029] The air intake assembly is installed on the outer wall of the furnace body 1 and consists of a blower 21, a heat exchanger 22, an air intake pipe 5, and multiple air intake nozzles 6. The air intake end of the blower 21 is connected to the heat exchanger 22, and the end of the heat exchanger 22 away from the blower 21 is connected to the air intake pipe 5. The air intake pipe 5 is fixedly connected to the outer wall of the furnace body 1, and the multiple air intake nozzles 6 are connected to the air intake pipe 5 and penetrate the furnace body 1 and are located inside the heating chamber.

[0030] The heat exchanger 22 is fixedly installed on the outer wall of the furnace body 1 by the bracket 20. The outer wall of the heat exchanger 22 is fixedly connected to the heat insulation cover 23. Multiple heat-spreading fins 24 are embedded in the inner wall of the heat insulation cover 23. The multiple heat-spreading fins 24 penetrate and extend into the interior of the heat exchanger 22. A heat exchange tube 7 is installed between the heat exchanger 22 and the heat insulation cover 23 in a spiral shape. The heat exchange tube 7 penetrates the multiple heat-spreading fins 24.

[0031] During operation, the blower 21 draws outside air into the heat exchanger 22. The air undergoes full heat exchange with the heat medium in the heat exchange tube 7 within the heat exchanger 22, thus being preheated. The preheated air enters the heating chamber through the air inlet pipe 5 and the air inlet nozzle 6. On the one hand, this provides sufficient oxygen for the combustion of the burner head 3, ensuring that the gas can be fully burned; on the other hand, the preheated air helps to improve combustion efficiency and reduce energy consumption.

[0032] The waste heat recovery assembly is installed on the outer wall of the furnace body 1, including a waste heat recovery box 11 and an exhaust pipe 14. The exhaust pipe 14 is located on the top outer wall of the furnace body 1. The waste heat recovery box 11 is connected to the heating chamber inside the furnace body 1 through the exhaust pipe 14. A partition plate 12 is fixedly connected to the inner wall of the waste heat recovery box 11, and multiple heat-conducting plates 13 are fixedly connected to the outer wall of the partition plate 12.

[0033] When the high-temperature exhaust gas generated in the heating chamber enters the waste heat recovery box 11 through the exhaust pipe 14, the heat in the exhaust gas will be transferred to the medium (such as water) in the waste heat recovery box 11 through the heat conduction plate 13 to achieve heat recovery. A water outlet pipe 18 is installed on one side of the outer wall of the waste heat recovery box 11. The water outlet pipe 18 is located below the partition plate 12. One end of the heat exchange pipe 7 is connected to the inner cavity of the waste heat recovery box 11 located below the partition plate 12 through the water outlet pipe 18. A water inlet 15 is provided on the front outer wall of the waste heat recovery box 11 for adding water medium to the bottom inner cavity of the waste heat recovery box 11.

[0034] A water pump 16 is fixedly installed on one side of the outer wall of the waste heat recovery box 11. The water pump 16 extends into the bottom cavity of the waste heat recovery box 11, and the water pump 16 is connected to the other end of the heat exchange tube 7 through the water inlet pipe 17. Through the action of the water pump 16, the water that has absorbed heat circulates in the heat exchange tube 7, transferring heat to the air in the heat exchanger 22.

[0035] Multiple exhaust holes 19 are provided on one side of the outer wall of the waste heat recovery box 11. The multiple exhaust holes 19 are located above the partition plate 12. The waste gas after heat exchange is discharged from the waste heat recovery box 11 through the exhaust holes 19.

[0036] The implementation principle of the silicon steel hot rolling normalizing annealing furnace structure in this application embodiment is as follows: Open the sealing door 9 at the feed inlet 10 on the outer wall of the furnace body 1, place the silicon steel to be annealed on the placement platform 8 above the heat insulation cavity, and close the sealing door 9 after placing the silicon steel to form a relatively sealed space in the heating cavity, so as to provide good environmental conditions for the annealing process and prevent heat loss and external impurities from entering.

[0037] The electromagnetic induction heating coil 4 in the heating assembly is evenly distributed on the inner wall of the heating cavity. When the electromagnetic induction heating coil 4 is energized, it generates an alternating magnetic field, which induces a current in the silicon steel. Since the silicon steel itself has a certain resistance, the Joule heat generated when the current passes through it causes the silicon steel to heat up, achieving rapid and efficient heating. This heating method can make the silicon steel reach a higher temperature in a shorter time and the heating is more uniform.

[0038] According to the requirements of the annealing process, when additional heat is required or the heating speed is required, the gas is delivered through the gas pipe 2 fixed on the outer wall of the furnace body 1 to multiple burners 3 that run through the furnace body 1. The burners 3 spray out the gas and ignite it. The heat generated by the flame further heats the silicon steel. Together with the electromagnetic induction heating, the silicon steel reaches the temperature required for annealing. During the heating process, the power of the electromagnetic induction heating coil 4 and the gas supply of the burners 3 can be flexibly adjusted according to the real-time temperature monitoring to precisely control the heating speed and temperature.

[0039] When the blower 21 of the air intake assembly is started, it draws in outside air and sends it into the heat exchanger 22 which is connected to the air intake end of the blower 21. Multiple heat-spreading fins 24 are embedded inside the heat insulation cover 23 on the outer wall of the heat exchanger 22. A heat exchange tube 7 is installed between the heat exchanger 22 and the heat insulation cover 23, which is spirally wound and passes through the heat-spreading fins 24. The heat exchange tube 7 contains a heat medium (such as water) from the waste heat recovery box 11. The air is in full contact with the heat exchange tube 7 in the heat exchanger 22 and absorbs heat through heat conduction and heat convection to achieve preheating.

[0040] The preheated air enters the heating chamber through the air inlet pipe 5 connected to the other end of the heat exchanger 22, and then through multiple air inlet nozzles 6 connected to the air inlet pipe 5 and penetrating the furnace body 1. The preheated air entering the heating chamber provides sufficient oxygen for the combustion of the gas in the burner head 3, promotes more complete combustion of the gas, and improves combustion efficiency. At the same time, the heat carried by the preheated air itself also helps to reduce the energy consumption required for heating silicon steel.

[0041] During the annealing process of silicon steel, the high-temperature exhaust gas generated in the heating chamber enters the waste heat recovery box 11 through the exhaust gas pipe 14 on the outer wall of the top of the furnace body 1. The partition plate 12 on the inner wall of the waste heat recovery box 11 and the multiple heat-conducting plates 13 on the outer wall start to play their role. When the high-temperature exhaust gas comes into contact with the heat-conducting plate 13, the heat is transferred to the medium (such as water) in the waste heat recovery box 11 through the heat-conducting plate 13.

[0042] Water that has absorbed heat from the waste gas enters the waste heat recovery tank 11 through the pump 16 at the bottom of the tank, and is then transported through the inlet pipe 17 to the heat exchange tube 7 in the heat exchanger 22. In the heat exchange tube 7, the hot water exchanges heat with the air inside the heat exchanger 22, transferring heat to the air for preheating. After heat exchange, the water flows back through the other end of the heat exchange tube 7 and through the outlet pipe 18 to the inner cavity of the waste heat recovery tank 11 located below the partition plate 12, forming a heat recycling system.

[0043] After heat exchange with water, the temperature of the exhaust gas has been greatly reduced. It is discharged through multiple exhaust holes 19 on one side of the outer wall of the waste heat recovery box 11, located above the partition plate 12, thereby reducing the thermal pollution caused by exhaust gas emissions to the environment.

[0044] Once the silicon steel has completed the annealing process and achieved the desired annealing effect, the sealing door 9 is opened again, and the annealed silicon steel is taken out from the placement table 8, thus completing the entire hot rolling normalizing annealing process of silicon steel.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A structure of a hot-rolled and normalized annealing furnace for silicon steel comprising a furnace body (1), characterized in that: The inside of the furnace body (1) is provided with a heating cavity and a heat insulation cavity, the heating cavity is internally provided with a heating assembly, the heating assembly comprises an electromagnetic induction heating coil (4), a gas pipe (2) and a plurality of combustion heads (3), the electromagnetic induction heating coil (4) is uniformly distributed on the inner wall of the heating cavity, the gas pipe (2) is fixedly connected to the outer wall of the furnace body (1), and the plurality of combustion heads (3) penetrate the furnace body (1) and are in communication with the gas pipe (2); The outer wall of the furnace body (1) is provided with an air inlet assembly, the air inlet assembly comprises a blower (21), a heat exchanger (22), an air inlet pipe (5) and a plurality of air inlet nozzles (6), the air inlet end of the blower (21) is in communication with the heat exchanger (22), one end of the heat exchanger (22) away from the blower (21) is in communication with the air inlet pipe (5), the air inlet pipe (5) is fixedly connected to the outer wall of the furnace body (1), the plurality of air inlet nozzles (6) are in communication with the air inlet pipe (5), and the plurality of air inlet nozzles (6) penetrate the furnace body (1) and are located in the heating cavity. The outer wall of the furnace body (1) is provided with a waste heat recovery assembly, the waste heat recovery assembly comprises a waste heat recovery tank (11) and an exhaust pipe (14), the exhaust pipe (14) is arranged on the top outer wall of the furnace body (1), the waste heat recovery tank (11) is in communication with the heating cavity in the furnace body (1) through the exhaust pipe (14), the inner wall of the waste heat recovery tank (11) is fixedly connected with a partition plate (12), and the outer wall of the partition plate (12) is fixedly connected with a plurality of heat conduction plates (13).

2. The silicon steel hot strip mill normalizing annealing furnace structure of claim 1, wherein: The heat exchanger (22) is fixedly installed on the outer wall of the furnace body (1) through a support (20), the outer wall of the heat exchanger (22) is fixedly connected with a heat insulation cover (23), a plurality of heat uniform fins (24) are embeddedly installed on the inner wall of the heat insulation cover (23), the plurality of heat uniform fins (24) penetrate and extend into the inside of the heat exchanger (22), a heat exchange pipe (7) is installed between the heat exchanger (22) and the heat insulation cover (23), and the heat exchange pipe (7) is spirally arranged between the heat exchanger (22) and the heat insulation cover (23) and penetrates the plurality of heat uniform fins (24).

3. The silicon steel hot strip mill patenting furnace structure of claim 2 wherein: One side of the outer wall of the waste heat recovery tank (11) is provided with a water outlet pipe (18), and the front outer wall is provided with a water inlet (15), the water outlet pipe (18) is located below the partition plate (12), and one end of the heat exchange pipe (7) is in communication with the inner cavity of the waste heat recovery tank (11) below the partition plate (12) through the water outlet pipe (18).

4. The silicon steel hot strip mill patenting furnace structure of claim 3 wherein: One side of the outer wall of the waste heat recovery tank (11) is fixedly provided with a water pump (16), one end of the water pump (16) extends into the bottom inner cavity of the waste heat recovery tank (11), and the other end of the water pump (16) is in communication with the heat exchange pipe (7) through the water inlet pipe (17).

5. The silicon steel hot strip mill normalizing annealing furnace structure of claim 4, wherein: One side of the outer wall of the waste heat recovery tank (11) is provided with a plurality of exhaust holes (19), and the plurality of exhaust holes (19) are located above the partition plate (12).

6. The silicon steel hot strip mill patenting furnace structure of claim 1 wherein: The furnace body (1) is fixedly connected with a placing table (8) above the heat insulation cavity.

7. The silicon steel hot strip mill patenting furnace structure of claim 1 wherein: The outer wall of the furnace body (1) is provided with a feeding port (10), and the outer wall of the feeding port (10) is hingedly connected with a sealing door (9).

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