Thermal radiation heating device for oriented silicon steel heat treatment

Abstract

The utility model discloses a thermal radiation heating device for oriented silicon steel heat treatment. The thermal radiation heating device comprises a radiant tube, the gas inlet pipe comprises a mixing pipe, a combustible gas inlet pipe and a combustion-supporting gas inlet pipe; the exhaust pipe comprises an air inlet outlet pipe, a heat exchange outlet pipe and an exhaust outlet pipe, the heat exchange inlet pipe is in heat exchange connection with the heat exchange outlet pipe, and the heat exchange area covers the heat exchange outlet pipe; the communicating position of the heat exchange outlet pipe and the exhaust outlet pipe is adjacent to the communicating position of the heat exchange inlet pipe and the mixing pipe. According to the thermal radiation heating device for oriented silicon steel heat treatment, the heat exchange area of the heat exchange inlet pipe and the heat exchange outlet pipe covers the heat exchange outlet pipe, the sufficient heat exchange area is guaranteed, the heat exchange amount is increased, the communicating position of the heat exchange outlet pipe and the exhaust outlet pipe and the communicating position of the heat exchange inlet pipe and the mixing pipe are adjacent, combustion-supporting gas is prevented from being cooled before entering the mixing pipe, and therefore the combustion-supporting gas is prevented from being cooled. Fuel damage is further reduced, and the smoke exhaust temperature is reduced, so that the energy-saving effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment of silicon steel, in particular to a thermal radiation heating device for heat treatment of oriented silicon steel. Background Art

[0002] Radiant tube is a heating device, and its working principle is to transfer heat to the heated object by radiation. It plays the role of traditional Chinese medicine in industrial furnaces such as annealing furnaces and high-temperature furnaces, and can effectively improve the uniformity of furnace temperature and the accuracy of furnace temperature control. It plays the role of traditional Chinese medicine in heat treatment of oriented silicon steel. Radiant tube heats silicon steel sheets to the required temperature and maintains it for a certain period of time, thereby changing the internal structure of silicon steel and improving magnetic properties. Compared with traditional continuous annealing furnaces, radiant tubes have the advantages of fast heating speed, good temperature uniformity, low oxidation degree, and are conducive to improving production efficiency.

[0003] In the prior art, for example, a Chinese utility model patent with announcement number CN218237458U discloses an energy-saving and environmentally friendly two-stage preheating radiant tube combustion device. The radiant tube combustion device is provided with a primary heat exchanger and a secondary heat exchanger, and utilizes the high-temperature flue gas generated by combustion to exchange heat with the combustion-supporting air before combustion, so that the combustion-supporting air is heated and enters the burner to assist combustion, which not only effectively utilizes the thermal energy of the high-temperature flue gas and reduces the loss of fuel, but also reduces the pollution of the high-temperature flue gas to the environment, thereby achieving the purpose of energy saving and environmental protection.

[0004] However, when the above-mentioned radiant tube combustion device is in operation, after the combustion air is heated up by the primary heat exchanger and the secondary heat exchanger, it needs to pass through the high-temperature air duct before entering the burner. When flowing in the high-temperature air duct, the high-temperature combustion air can easily exchange heat with the outside through the tube wall of the high-temperature air duct, causing the temperature of the combustion air to drop, thereby increasing fuel loss. Moreover, the flue gas generated by the combustion has a short flow path and a short heat exchange time with the combustion gas, which limits the temperature increase of the combustion gas and the temperature drop of the flue gas, making it impossible to fully utilize the heat of the combustion gas, and the temperature of the flue gas discharged from the device is still relatively high.

[0005] Therefore, it is necessary to improve the radiation tube combustion device for heat treatment of oriented silicon steel in the prior art. Utility Model Content

[0006] The utility model aims to overcome the defects in the prior art and provide a thermal radiation heating device for heat treatment of oriented silicon steel, which further enhances the heat exchange effect between flue gas and combustion-supporting gas, reduces heat loss and improves energy-saving performance.

[0007] In order to achieve the above technical effects, the technical solution of the utility model is: a thermal radiation heating device for heat treatment of oriented silicon steel, comprising:

[0008] A radiation tube, wherein two ends of the radiation tube are respectively an air inlet end and an air outlet end;

[0009] An air intake pipe, the air intake pipe comprising a mixing pipe, a combustible gas inlet pipe and a combustion-supporting gas inlet pipe, the mixing pipe being connected to the air intake end and the combustible gas inlet pipe, the combustion-supporting gas inlet pipe comprising a ventilation inlet pipe and a heat exchange inlet pipe, the heat exchange inlet pipe being connected between the ventilation inlet pipe and the mixing pipe;

[0010] An exhaust pipe, the exhaust pipe comprising an air inlet outlet pipe, a heat exchange outlet pipe and an exhaust outlet pipe which are connected in sequence, the air inlet outlet pipe is connected to the air outlet end, and the exhaust outlet pipe is connected to the outside;

[0011] The heat exchange inlet pipe is connected to the heat exchange outlet pipe for heat exchange, and the heat exchange area covers the heat exchange outlet pipe; the connection position between the heat exchange outlet pipe and the exhaust outlet pipe and the connection position between the heat exchange inlet pipe and the mixing pipe are adjacent.

[0012] Preferably, in order to reduce heat loss and ensure that the combustible gas enters the mixing tube at a higher temperature, the heat exchange outlet pipe is arranged on the inner side of the heat exchange inlet pipe, and the circumferential outer edge of the heat exchange outlet pipe and the circumferential inner wall of the heat exchange inlet pipe are combined to form a heat absorption channel for the auxiliary gas to pass through, and the heat absorption channel is connected between the mixing tube and the ventilation inlet pipe.

[0013] Preferably, in order to ensure uniform heat exchange, the heat exchange outlet pipe and the heat exchange inlet pipe are coaxial.

[0014] Preferably, in order to enhance the heat exchange effect, a spiral blade is provided in the heat exchange outlet pipe, the axis of the spiral blade coincides with the axis of the heat exchange outlet pipe, and the spiral blade and the circumferential inner wall of the heat exchange outlet pipe form a spiral heat release channel for the flue gas to pass through.

[0015] Preferably, in order to further enhance the heat exchange effect, the heat exchange inlet pipe and the heat exchange outlet pipe are both provided in plurality and in one-to-one correspondence.

[0016] Preferably, in order to reduce heat loss, it also includes an insulation shell, the heat exchange inlet pipe and the heat exchange outlet pipe are both arranged in the insulation shell, and the mixing tube, the combustible gas inlet pipe, the ventilation inlet pipe, the air inlet outlet pipe and the exhaust outlet pipe are all sealed and pass through the side wall of the insulation shell.

[0017] Preferably, in order to expand the insulation range of the insulation shell, the insulation shell is fixedly connected to the air inlet end and the air outlet end.

[0018] Preferably, in order to enhance the heat-insulating capacity of the heat-insulating shell, a negative pressure port is provided on the heat-insulating shell, and the negative pressure port is used to connect a negative pressure device.

[0019] Preferably, in order to facilitate the regulation of the combustible gas flow rate, the combustible gas inlet pipe is connected to a proportional valve.

[0020] Preferably, in order to expand the thermal radiation range of the radiant tube, the mixing tube includes an injection section extending into the radiant tube, the two ends of the injection section are respectively a necked end and a flared end, the necked end is located between the flared end and the air outlet end, the inner diameter of the necked end is smaller than the inner diameter of the flared end, and the flared end is gradually transitioned to the necked end.

[0021] To sum up, compared with the prior art, the thermal radiation heating device for heat treatment of oriented silicon steel of the utility model covers the heat exchange outlet pipe by the heat exchange area of ​​the heat exchange inlet pipe and the heat exchange outlet pipe, thereby ensuring sufficient heat exchange area and increasing the heat exchange capacity. In addition, the connecting position between the heat exchange outlet pipe and the exhaust outlet pipe and the connecting position between the heat exchange inlet pipe and the mixing pipe are close to each other, thereby avoiding cooling of the combustion air before entering the mixing pipe. In this way, fuel damage is further reduced and the exhaust temperature of the flue gas is lowered, thereby improving the energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the first embodiment;

[0023] Figure 2 yes Figure 1 Explosion diagram of

[0024] Figure 3 yes Figure 1 A front view of

[0025] Figure 4 yes Figure 3 AA section view;

[0026] Figure 5 is a schematic structural diagram of a second embodiment;

[0027] Figure 6 yes Figure 5 Explosion diagram of

[0028] Figure 7 is a schematic structural diagram of the heat-insulating shell of the third embodiment;

[0029] Figure 8 is a cross-sectional view of a mixing tube according to a fourth embodiment;

[0030] In the figure: 1, radiation tube; 11, air inlet end; 12, air outlet end; 2, air inlet pipe; 21, mixing pipe; 211, injection section; 22, combustible gas inlet pipe; 221, proportional valve; 23, combustion-supporting gas inlet pipe; 231, ventilation inlet pipe; 232, heat exchange inlet pipe; 3, exhaust pipe; 31, air inlet outlet pipe; 32, heat exchange outlet pipe; 321, spiral blade; 33, exhaust outlet pipe; 4, insulation shell; 41, shell body; 42, shell cover; 43, negative pressure port. DETAILED DESCRIPTION

[0031] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0032] First embodiment

[0033] like Figure 1-Figure 4 As shown, the thermal radiation heating device for heat treatment of oriented silicon steel according to the first embodiment of the utility model comprises:

[0034] A radiation tube 1, wherein two ends of the radiation tube 1 are respectively an air inlet end 11 and an air outlet end 12;

[0035] The air inlet pipe 2 includes a mixing pipe 21, a combustible gas inlet pipe 22 and a combustion-supporting gas inlet pipe 23. The mixing pipe 21 is connected to the air inlet end 11 and the combustible gas inlet pipe 22. The combustion-supporting gas inlet pipe 23 includes a ventilation inlet pipe 231 and a heat exchange inlet pipe 232. The heat exchange inlet pipe 232 is connected between the ventilation inlet pipe 231 and the mixing pipe 21.

[0036] The exhaust pipe 3 includes an air inlet outlet pipe 31, a heat exchange outlet pipe 32 and an exhaust outlet pipe 33 which are connected in sequence, the air inlet outlet pipe 31 is connected to the air outlet end 12, and the exhaust outlet pipe 33 is connected to the outside;

[0037] The heat exchange inlet pipe 232 is connected to the heat exchange outlet pipe 32 for heat exchange, and the heat exchange area covers the heat exchange outlet pipe 32; the connection position between the heat exchange outlet pipe 32 and the exhaust outlet pipe 33 and the connection position between the heat exchange inlet pipe 232 and the mixing pipe 21 are adjacent.

[0038] When the device is in operation, combustible gas (usually natural gas) continuously enters the mixing tube 21 through the combustible gas inlet pipe 22, and supporting combustion gas (usually air) continuously enters the mixing tube 21 through the supporting combustion gas inlet pipe 23. The supporting combustion gas and the combustible gas are mixed in the mixing tube 21 and then passed into the radiation tube 1. An ignition device (not shown in the figure) is arranged in the radiation tube 1 to make the combustible gas burn and generate flue gas and heat. The heat is radiated outward through the radiation tube 1 and is used for heat treatment of silicon steel. The temperature of the generated flue gas is relatively high. After being discharged from the gas outlet end 12, it is discharged to the outside through the exhaust pipe 3.

[0039] The flue gas is discharged into the heat exchange outlet pipe 32 through the air inlet pipe 31. During the flow toward the exhaust outlet pipe 33, the heat exchange inlet pipe 232 in the combustion-supporting gas inlet pipe 23 continuously introduces the combustion-supporting gas, so that the high-temperature flue gas and the combustion-supporting gas exchange heat. Since the heat exchange inlet pipe 232 is connected to the heat exchange outlet pipe 32 for heat exchange and the heat exchange area covers the heat exchange outlet pipe 32, sufficient heat exchange area is guaranteed, thereby increasing the heat exchange amount. In addition, the connecting position of the heat exchange outlet pipe 32 and the exhaust outlet pipe 33 and the connecting position of the heat exchange inlet pipe 232 and the mixing tube 21 are close to each other, which avoids the situation where the temperature of the combustion-supporting gas heated after the heat exchange drops after entering the mixing tube 21, so that the high-temperature combustion-supporting gas enters the mixing tube 21 and mixes with the combustible gas, thereby saving fuel and reducing losses. Moreover, since the heat exchange area covers the heat exchange outlet pipe 32, the heat exchange amount is further improved to ensure that the temperature of the flue gas drops significantly after the heat exchange and is discharged through the exhaust outlet pipe 33, thereby reducing the harm to the environment. In this way, the environmental protection performance of the device is further improved.

[0040] A further improvement is that the heat exchange outlet pipe 32 is arranged on the inner side of the heat exchange inlet pipe 232, and the circumferential outer edge of the heat exchange outlet pipe 32 and the circumferential inner wall of the heat exchange inlet pipe 232 are enclosed to form a heat absorption flow channel for the auxiliary combustion gas to pass through, and the heat absorption flow channel is connected between the mixing tube 21 and the ventilation inlet pipe 231; the heat exchange outlet pipe 32 and the heat exchange inlet pipe 232 are coaxial.

[0041] After adopting the above design, when combustion heating is carried out, the generated flue gas is discharged from the outlet end 12 of the radiation tube 1, and is discharged into the heat exchange outlet pipe 32 through the air inlet and outlet pipe 31, and the introduced combustion-supporting gas enters the heat absorption flow channel between the heat exchange inlet pipe 232 and the heat exchange outlet pipe 32 through the ventilation inlet pipe 231. When flowing in the heat absorption flow channel, the heat of the flue gas is absorbed by the wall of the heat exchange outlet pipe 32, so that the temperature of the combustion-supporting gas rises. Since the heat exchange outlet pipe 32 and the heat exchange inlet pipe 232 are coaxial, and the inner diameter of the heat exchange inlet pipe 232 is larger than the outer diameter of the heat exchange outlet pipe 32, the combustion-supporting gas in the heat exchange flow channel can be uniformly absorbed along the radial direction of the heat exchange inlet pipe 232. The heat of flue gas is absorbed to ensure the uniformity of the temperature rise of the combustion-supporting gas; moreover, in the device, the heat exchange outlet pipe 32 is located on the inner side of the heat exchange inlet pipe 232, and the flue gas temperature in the heat exchange outlet pipe 32, the combustion-supporting gas temperature between the heat exchange inlet pipe 232 and the heat exchange outlet pipe 32, and the outside temperature gradually decrease. Compared with the method of setting the heat exchange inlet pipe 232 on the inner side of the heat exchange outlet pipe 32, the combustion-supporting gas temperature before heating in this embodiment is closer to the outside temperature. Therefore, it is possible to reduce heat loss and avoid the heat of the flue gas in the heat exchange outlet pipe 32 being directly transferred to the outside. In this way, the heat exchange effect is ensured, so that the combustion-supporting gas flowing in the heat absorption channel is maintained at a higher temperature.

[0042] A further improvement is that a spiral blade 321 is provided in the heat exchange outlet pipe 32, the axis of the spiral blade 321 coincides with the axis of the heat exchange outlet pipe 32, and the spiral blade 321 and the circumferential inner wall of the heat exchange outlet pipe 32 form a spiral heat release flow channel for the flue gas to pass through.

[0043] A sealing plug is provided at one end of the spiral blade 321 away from the air inlet outlet pipe 31 to seal the end of the heat exchange outlet pipe 32 away from the air inlet outlet pipe 31; the exhaust outlet pipe 33 is vertically fixed on the inner wall of the heat exchange outlet pipe 32 and is adjacent to the sealing plug; the spiral blade 321 is fixedly connected to the circumferential inner wall of the heat exchange outlet pipe 32.

[0044] After adopting the above structure, the spiral blades 321 can be used to guide the flow direction of the high-temperature flue gas, so that the flue gas flows along the spiral heat release flow channel. The spiral heat release flow channel extends the flow path length of the flue gas. During the flow, the flue gas contacts the spiral blades 321 and the tube wall of the heat exchange outlet pipe 32, so as to fully transfer the heat to the heat exchange outlet pipe 32 and the spiral blades 321, thereby avoiding the difficulty in transferring the heat inside the flue gas. After absorbing the heat, the spiral blades 321 can also transfer it to the tube wall of the heat exchange outlet pipe 32, so that the combustion-supporting gas flowing in the heat absorption flow channel can fully absorb the heat through the tube wall of the heat exchange outlet pipe 32, thereby further enhancing the temperature increase and heat exchange effect.

[0045] A further improvement is that a plurality of heat exchange inlet pipes 232 and heat exchange outlet pipes 32 are provided and correspond one to one.

[0046] Specifically, in this embodiment, three heat exchange inlet pipes 232, heat exchange outlet pipes 32 and exhaust outlet pipes 33 are provided, and are evenly spaced along the axial direction of the air inlet and outlet pipes 31. Of course, the number of heat exchange inlet pipes 232 and heat exchange outlet pipes 32 can also be other numbers according to the actual size. By increasing the number of heat exchange inlet pipes 232 and heat exchange outlet pipes 32, the heat exchange area can be further increased, the heat exchange amount can be increased, and the high-temperature flue gas can fully exchange heat with the combustion-supporting gas before entering the mixing tube 21, so as to increase the temperature of the combustion-supporting gas when entering the mixing tube 21, and reduce the temperature of the flue gas discharged from the exhaust outlet pipe 33, thereby reducing the harm to the environment. In addition, the mixing tube 21 is also provided with an inlet port that is connected to the heat exchange inlet pipe 232 in a one-to-one correspondence, so that the heated combustion-supporting gas can be fully and evenly mixed with the combustible gas entering the mixing tube 21, which is conducive to the full combustion of the combustible gas in the radiation tube 1.

[0047] A further improvement is that the combustible gas inlet pipe 22 is connected to a proportional valve 221. By providing the proportional valve 221, the flow rate of the combustible gas entering the mixing tube 21 can be conveniently adjusted, which can not only adjust the radiation temperature of the radiation tube 1, but also promote the full combustion of the combustible gas, thereby preventing the smoke discharged from the exhaust outlet pipe 33 due to incomplete combustion from harming the surrounding air.

[0048] Second embodiment

[0049] like Figure 5 and Figure 6 As shown, the thermal radiation heating device for heat treatment of oriented silicon steel in the second embodiment of the utility model is based on the first embodiment, with the difference that it also includes an insulation shell 4, the heat exchange inlet pipe 232 and the heat exchange outlet pipe 32 are both arranged in the insulation shell 4, and the mixing pipe 21, the combustible gas inlet pipe 22, the ventilation inlet pipe 231, the air inlet pipe and the exhaust outlet pipe 33 are all sealed and pass through the side wall of the insulation shell 4.

[0050] Specifically, the heat-insulating shell 4 includes a shell 41 with an open bottom and a shell cover 42 covering the bottom of the shell 41. By providing the heat-insulating shell 4, the heat-insulating shell 4 can completely wrap the heat exchange inlet pipe 232 and the heat exchange outlet pipe 32, and wrap a part of the mixing tube 21, a part of the combustible gas inlet pipe 22, and a part of the ventilation inlet pipe 231, thereby reducing the heat lost to the outside before the flue gas is discharged to the outside, and further helping to maintain the temperature of the combustion-supporting gas before entering the mixing tube 21, achieving heat preservation, reducing fuel loss, and achieving energy saving.

[0051] The heat preservation shell 4 is fixedly connected to the air inlet end 11 and the air outlet end 12. Specifically, the shell 41 is fixedly connected to the air inlet end 11 and the air outlet end 12, so as to expand the heat preservation range, reduce heat damage, and thus save fuel.

[0052] Third embodiment

[0053] like Figure 7 As shown, the thermal radiation heating device for heat treatment of oriented silicon steel in the third embodiment of the utility model is based on the second embodiment, and a negative pressure port 43 is provided on the heat insulation shell 4, and the negative pressure port 43 is used to connect a negative pressure device.

[0054] Specifically, the negative pressure port 43 is arranged on the shell 41. By setting the negative pressure port 43, the negative pressure port 43 is connected to the negative pressure device to extract the air in the insulation shell 4, reduce the heat transfer medium, and thereby reduce the heat transferred from the insulation shell 4 to the outside, reduce heat loss, and thus save fuel.

[0055] Fourth embodiment

[0056] like Figure 8 As shown, the thermal radiation heating device for heat treatment of oriented silicon steel of the fourth embodiment of the utility model is based on the second embodiment. The mixing tube 21 includes an injection section 211 extending into the radiation tube 1. The two ends of the injection section 211 are respectively a necking end and a flaring end. The necking end is located between the flaring end and the air outlet end 12. The inner diameter of the necking end is smaller than the inner diameter of the flaring end. The flaring end is gradually transitioned to the necking end.

[0057] After adopting the above design, when the mixed gas composed of the supporting combustion gas and the combustible gas passes through the injection section 211, the diameter gradually becomes smaller, so that the gas pressure gradually increases. After the pressure increases, the flow velocity of the mixed gas flowing out of the mixing tube 21 is greater, and accordingly, the combustion position of the mixed gas is farther away from the air inlet end 11. The end of the mixing tube 21 adjacent to the air inlet end 11 is a burner. On the one hand, it can avoid the combustion position being too close to the burner and damaging the burner. On the other hand, it increases the flow velocity of the mixed gas flowing out of the burner, so that the mixed gas burns at a farther position, which is convenient for evenly diffusing the heat generated by the combustion through the radiation tube 1, thereby improving the heat treatment effect.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A thermal radiation heating device for heat treatment of oriented silicon steel, characterized in that: include: A radiation tube (1), wherein two ends of the radiation tube (1) are respectively an air inlet end (11) and an air outlet end (12); An air intake pipe (2), the air intake pipe (2) comprising a mixing pipe (21), a combustible gas inlet pipe (22) and a combustion-supporting gas inlet pipe (23), the mixing pipe (21) being in communication with the air intake end (11) and the combustible gas inlet pipe (22), the combustion-supporting gas inlet pipe (23) comprising a ventilation inlet pipe (231) and a heat exchange inlet pipe (232), the heat exchange inlet pipe (232) being in communication between the ventilation inlet pipe (231) and the mixing pipe (21); An exhaust pipe (3), the exhaust pipe (3) comprising an air inlet outlet pipe (31), a heat exchange outlet pipe (32) and an exhaust outlet pipe (33) which are connected in sequence, the air inlet outlet pipe (31) being connected to the air outlet end (12), and the exhaust outlet pipe (33) being connected to the outside; The heat exchange inlet pipe (232) is connected to the heat exchange outlet pipe (32) by heat exchange, and the heat exchange area covers the heat exchange outlet pipe (32); the connection position between the heat exchange outlet pipe (32) and the exhaust outlet pipe (33) and the connection position between the heat exchange inlet pipe (232) and the mixing pipe (21) are closely adjacent.

2. The thermal radiation heating device for heat treatment of oriented silicon steel according to claim 1, characterized in that: The heat exchange outlet pipe (32) is arranged on the inner side of the heat exchange inlet pipe (232), and the circumferential outer edge of the heat exchange outlet pipe (32) and the circumferential inner wall of the heat exchange inlet pipe (232) are combined to form a heat absorption flow channel for the combustion-supporting gas to pass through, and the heat absorption flow channel is connected between the mixing pipe (21) and the ventilation inlet pipe (231).

3. The thermal radiation heating device for heat treatment of oriented silicon steel according to claim 2, characterized in that: The heat exchange outlet pipe (32) and the heat exchange inlet pipe (232) are coaxial.

4. The thermal radiation heating device for heat treatment of oriented silicon steel according to claim 2, characterized in that: A spiral blade (321) is arranged inside the heat exchange outlet pipe (32); the axis of the spiral blade (321) coincides with the axis of the heat exchange outlet pipe (32); the spiral blade (321) and the circumferential inner wall of the heat exchange outlet pipe (32) enclose a spiral heat release flow channel, and the heat release flow channel is for flue gas to pass through.

5. The thermal radiation heating device for heat treatment of oriented silicon steel according to claim 2, characterized in that: The heat exchange inlet pipe (232) and the heat exchange outlet pipe (32) are both provided in plurality and correspond one to one.

6. The thermal radiation heating device for heat treatment of oriented silicon steel according to claim 1, characterized in that: It also includes an insulation shell (4), the heat exchange inlet pipe (232) and the heat exchange outlet pipe (32) are both arranged in the insulation shell (4), and the mixing pipe (21), the combustible gas inlet pipe (22), the ventilation inlet pipe (231), the air inlet outlet pipe (31) and the exhaust outlet pipe (33) are all sealed and penetrate the side wall of the insulation shell (4).

7. The thermal radiation heating device for heat treatment of oriented silicon steel according to claim 6, characterized in that: The heat-insulating shell (4) is fixedly connected to the air inlet end (11) and the air outlet end (12).

8. The thermal radiation heating device for heat treatment of oriented silicon steel according to claim 6, characterized in that: The heat-insulating shell (4) is provided with a negative pressure port (43), and the negative pressure port (43) is used to connect a negative pressure device.

9. The thermal radiation heating device for heat treatment of grain-oriented silicon steel according to any one of claims 1 to 8, characterized in that: The combustible gas inlet pipe (22) is connected to a proportional valve (221).

10. The thermal radiation heating device for heat treatment of grain-oriented silicon steel according to any one of claims 1 to 8, characterized in that: The mixing tube (21) comprises an injection section (211) extending into the radiation tube (1), the injection section (211) having two ends respectively comprising a constricted end and a flared end, the constricted end being located between the flared end and the gas outlet end (12), the inner diameter of the constricted end being smaller than the inner diameter of the flared end, and the flared end being arranged in a gradual transitional manner toward the constricted end.

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