A tundish baking device using blast furnace gas and high baking temperature

Abstract

The present invention belongs to the technical field of continuous casting equipment in the steel industry, and discloses a tundish baking device with high baking temperature using blast furnace gas. It comprises a double preheating heat exchange system, wherein the front end of the double preheating heat exchange system is connected to a pipeline system, and the rear end of the double preheating heat exchange system is connected to a gas internal combustion burner system; one side of the double preheating heat exchange system is connected to an induced draft system, and the other side is connected to a flue gas branch pipeline; the pipeline system and the gas internal combustion burner system are respectively connected to a PLC system. A blast furnace gas high baking temperature tundish baking device is provided to solve the problem that when the continuous casting tundish baking device of the prior art is changed to use blast furnace gas, the tundish baking device cannot meet the requirements of not being easy to extinguish and quickly reaching the tundish baking temperature of 1100°C.

Description

Technical Field

[0001] The invention belongs to the technical field of continuous casting equipment in the steel industry, and relates to a tundish baking device with high baking temperature using blast furnace gas. Background Art

[0002] The steel industry is a pillar industry of the national economy, a resource- and energy-intensive industry, and also the focus of energy system optimization. With the adjustment of the energy structure of steel plants, high calorific value gas is often used for power generation or other high value-added processes, and the use of low calorific value blast furnace gas to bake the tundish has become a development trend. Due to the production and gas conservation needs, the tundish baker often needs to be baked to 1100-1200℃ in a short time, and at the same time, it must ensure that it will not be extinguished due to the low calorific value of the gas during operation. Due to the low combustion efficiency of the burner at present, the target temperature is often reached by extending the baking time, but it causes serious gas waste and slows down the production rhythm; the existing baking equipment generally uses traditional air combustion, the combustion is not complete, and the nitrogen in the air does not participate in the combustion and wastes a lot of heat; in addition, some tundish bakers only preheat the air due to structural conditions and cannot meet the low calorific value gas combustion requirements, and the regenerative tundish baker has low reliability and difficulty in long-term stable operation. These problems make it difficult to replace the mixed gas with blast furnace gas in the existing continuous casting production equipment, and cannot meet the needs of the continuous casting production process.

[0003] Because of this, developing a tundish baking device with strong combustion capability, which uses blast furnace gas as an energy medium and can ensure high baking temperature is an integrated equipment of great significance that we urgently need to develop. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned background technology and to provide a blast furnace gas high baking temperature tundish baking device to solve the problem that when the continuous casting tundish baking device in the prior art is changed to blast furnace gas, the tundish baking device cannot meet the process requirements of not being easy to be extinguished and quickly reaching the tundish baking temperature of 1100°C.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a blast furnace gas high-baking temperature tundish baking device, including a double preheating heat exchange system, the front end of the double preheating heat exchange system is connected to a pipeline system, and the rear end of the double preheating heat exchange system is connected to a gas internal combustion burner system; one side of the double preheating heat exchange system is connected to an induced draft system, and the other side is connected to a flue gas branch pipeline; the pipeline system and the gas internal combustion burner system are respectively connected to a PLC system.

[0006] The pipeline system includes a gas pipeline system, an oxygen pipeline system, a nitrogen purge pipeline system, and a combustion-supporting air pipeline system; the gas pipeline system includes a gas pipeline, and the combustion-supporting air pipeline system includes an air pipeline, and the ends of the air pipeline and the gas pipeline are respectively connected to the front end of the double preheating heat exchange system; the nitrogen purge pipeline system includes a nitrogen pipeline, and the end of the nitrogen pipeline is connected to the gas pipeline; the oxygen pipeline system includes an oxygen pipeline, and the end of the oxygen pipeline is connected to the air pipeline;

[0007] The gas pipeline is provided with a manual butterfly valve, a manual blind plate valve, a gas pressure transmitter, a gas flow meter, a gas regulating valve, and a gas quick-cut valve which are connected in sequence; a gas inlet is provided at the front end of the gas pipeline;

[0008] The oxygen pipeline is provided with a manual ball valve, a flame arrester, an oxygen regulating valve, and an oxygen flow meter which are connected in sequence;

[0009] The air pipeline is provided with a blower, an air pressure transmitter, an air regulating valve, and an air flow meter which are connected in sequence; the end of the oxygen pipeline is connected to the pipeline at the rear end of the air flow meter;

[0010] The nitrogen pipeline is provided with a nitrogen purge solenoid valve and a nitrogen purge quick-cut valve connected in parallel; the end of the nitrogen purge quick-cut valve is connected to the gas quick-cut valve, and the end of the nitrogen purge solenoid valve is connected to the pipeline at the rear end of the gas quick-cut valve.

[0011] The gas internal combustion burner system includes a burner. The induced draft system includes an induced draft fan and an induced draft duct connected in sequence. The dual preheating heat exchange system includes a dual preheating heat exchanger.

[0012] The burner comprises a gas tee; a burner outer tube is arranged outside the lower end of the gas tee, a burner outer tube interface is arranged at the upper end of the burner outer tube, and an oxygen pipeline is connected to the burner outer tube interface; the gas tee is connected to the gas pipeline through a convex flange arranged on the vertical end face of the gas tee; a convex flat welding flange is sleeved on the outer wall of the upper port of the gas tee, an upper cover plate connected to the convex flat welding flange is arranged on the top of the gas tee, a positioning hole is arranged in the center of the upper cover plate, a sleeve is arranged in the positioning hole, and the sleeve passes through The upper cover plate is arranged inside the gas tee, and a diameter adjusting pipe is arranged at the center of the sleeve, and a diameter adjusting screw is arranged inside the diameter adjusting pipe; a conical valve is arranged at the lower end of the gas tee, and the outer wall of the lower end of the gas tee is connected with the burner upper cover plate, and the burner upper cover plate is connected to the burner outer tube, and a burner combustion tube is arranged at the center of the burner outer tube, and the lower end of the diameter adjusting pipe passes through the conical valve and is located in the burner combustion tube, and a number of stabilizing rods are arranged in the burner combustion tube; the outer wall of the bottom end of the burner outer tube is connected with a burner flange for connecting with the cover of the tundish baking device.

[0013] Further, the burner outer tube interface is connected to the end of the oxygen pipeline, and the front end of the oxygen pipeline is provided with an oxygen interface. The gas tee is connected to the end of the gas pipeline, and the front end of the gas pipeline is provided with a gas interface. The burner outer tube is welded to the outside of the lower end of the gas tee. The vertical end face of the gas tee is provided with a convex flange; the convex flange is fixed to the vertical end face of the gas tee by a positioning nut. An adjusting handwheel is provided above the upper cover plate; the adjusting handwheel is connected to the top of the diameter adjusting screw through a positioning nut A, the upper end of the sleeve is open, and a sealing end plate is provided at the upper end opening; a sealing ring is provided at the connection between the diameter adjusting screw and the sealing end plate, and a central hole for the diameter adjusting pipe to pass through is opened at the lower end of the sleeve. An adjusting nut is provided at the top of the diameter adjusting pipe, and the diameter adjusting screw passes through the adjusting nut and is placed in the diameter adjusting pipe. The horizontal plane of the upper end of the sleeve is located between the adjusting handwheel and the upper cover plate. The sealing ring is an O-ring. The plurality of stable combustion rods are arranged in an eight-shaped structure. The sleeve is connected to the diameter adjusting pipe by a positioning screw.

[0014] Furthermore, the gas pressure transmitter, gas flow meter, gas regulating valve, gas quick-cut valve, oxygen regulating valve, oxygen flow meter, air pressure transmitter, air regulating valve, air flow meter, nitrogen purge solenoid valve, and nitrogen purge quick-cut valve are respectively connected to the PLC system.

[0015] The gas pipeline system is equipped with a low-pressure alarm device and a gas concentration detection alarm device. The burner is equipped with an automatic igniter and an ultraviolet flame detector. The burner is also equipped with a heat shield, and an infrared temperature sensor is provided on the heat shield. The low-pressure alarm device and the gas concentration detection alarm device are sound and light alarms. The low-pressure alarm device, gas concentration detection alarm device, automatic igniter, ultraviolet flame detector, and infrared temperature sensor are connected to the PLC system respectively.

[0016] Furthermore, the gas quick-cut valve is a gas pneumatic quick-cut valve, and the gas regulating valve is an electric gas regulating valve.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The invention provides a tundish baking device with high baking temperature using blast furnace gas. The device can use low calorific value blast furnace gas to bake the tundish and meet the requirement of high baking temperature. The whole device has simple structure, good reliability, high combustion efficiency, strong waste heat recovery ability, and can be used for baking tundishes with high calorific value. x Less emissions, achieving the effect of energy saving and emission reduction.

[0019] The baking device provided by the present invention adopts a gas internal combustion burner, and the combustion-supporting gas forms a layer of air curtain in the combustion tube when it passes through the coal gas, so that the air and coal gas are fully mixed in the combustion tube. Several flame stabilizing rods are specially arranged inside the burner to ensure the stability of the flame, so that the blast furnace gas will not be easily extinguished. The burner is oxygen-enriched combustion, and high-oxygen-content gas is used instead of conventional air as the combustion-supporting gas, so that the oxygen in the combustion area is more sufficient, the combustion is more complete, and the flame temperature is increased. At the same time, compared with ordinary air, the combustion-supporting gas greatly reduces the intervention of nitrogen that affects the combustion effect, and the heat carried away by the flue gas is also reduced, and the energy-saving effect is obvious. Utilizing the principle of jet air induction, the air is automatically distributed according to the pipeline pressure. When the pipeline pressure changes, the air volume it brings in also changes accordingly, and no de-fire phenomenon occurs. When the baking device provided by the present invention is baked, the temperature distribution of the heated lining at the bottom of the tundish is more uniform, the thermal stress on the permanent layer of the tundish is greatly reduced, the crusting effect is greatly improved, the permanent layer is protected, and the service life is improved. The final baking temperature of low calorific value blast furnace gas is the same as that of existing high calorific value gas, which reduces the temperature drop of molten steel and achieves energy saving and consumption reduction.

[0020] The baking device provided by the present invention adopts an air-gas dual preheater to extract part of the high-temperature flue gas discharged from the outer shell for preheating. Compared with the second-generation heat storage technology, it is more reliable and still has the ability to preheat air to 500°C and gas to 400°C.

[0021] The baking device provided by the present invention has a simple structure, does not require frequent replacement of the reversing valve, does not have the problem of heat storage body clogging, has good reliability, low maintenance difficulty and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0023] Figure 1 It is an overall structural diagram of a blast furnace gas high baking temperature tundish baking device of the present invention.

[0024] Figure 2 It is a cross-sectional view of the burner of the present invention.

[0025] In the figure, 1. gas pipeline system, 2. oxygen pipeline system, 3. nitrogen purge pipeline system, 4. combustion air pipeline system, 5. gas internal combustion burner system, 6. induced draft fan, 7. double preheating heat exchanger, 8. flue gas branch pipeline, 9. PLC system, 101. manual butterfly valve, 102. manual blind plate valve, 103. gas pressure transmitter, 104. gas flow meter, 105. gas regulating valve, 106. gas quick cut valve, 201. manual ball valve, 202. flame arrester, 203. oxygen regulating valve, 204. oxygen flow meter, 301. nitrogen purge solenoid valve, 401. blower, 402. 02. Air pressure transmitter, 403. Air regulating valve, 404. Air flow meter, 501. Positioning nut A, 502. Adjusting hand wheel, 503. Sealing end plate, 504. Sealing ring, 505. Upper cover plate, 506. Positioning nut B, 507. Raised flat welding flange, 508. Adjusting screw, 509. Gas tee, 510. Burner upper cover plate, 511. Burner combustion tube, 512. Burner outer tube, 513. Burner flange, 514. Conical valve, 515. Burner outer tube interface, 516. Casing, 517. Positioning screw, 518. Adjusting tube, 519. Adjusting nut. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0027] The gas pressure transmitter, gas flow meter, gas regulating valve, gas quick-cut valve, oxygen regulating valve, oxygen flow meter, air pressure transmitter, air regulating valve, air flow meter, nitrogen purge solenoid valve, nitrogen purge quick-cut valve, nitrogen regulating valve, automatic igniter, ultraviolet flame detector, infrared temperature sensor, and sound and light alarm connected to the PLC system in this embodiment are not limited to a certain model. The gas regulating valve, gas quick-cut valve, oxygen regulating valve, nitrogen regulating valve, air regulating valve, nitrogen purge solenoid valve, and nitrogen purge quick-cut valve can be valves that can accept the control signal of the PLC system to realize the opening and closing function; the gas flow meter, oxygen flow meter, and air flow meter are of any model and can realize flow measurement and feed back the signal to the PLC system function; the gas pressure transmitter and air pressure transmitter can be any instrument that can realize flow measurement and feed back the signal to the PLC system function. The model of the instrument is not limited, and it can realize pressure measurement and feed back the signal to the PLC system function; the model of the infrared temperature sensor is not limited, and it can realize temperature measurement and feed back the signal to the PLC system function; the model of the ultraviolet flame detector is not limited, and it can realize the timed output of the ignition signal and the fuel valve opening signal; if the ignition is successful, the fuel valve opening signal will continue to be output after the ignition signal is turned off; if the ignition fails, the ignition signal and the fuel valve opening signal will be turned off, and a passive alarm signal will be output, and the above signal will be fed back to the ultraviolet flame detector of the PLC system function; the model of the automatic igniter is not limited, and it can receive the ignition signal and realize the ignition function. The model of the sound and light alarm is not limited, and it can receive the output signal of the PLC system and realize the alarm function.

[0028] Example 1

[0029] A blast furnace gas high baking temperature tundish baking device, such as Figure 1 As shown, it includes a double preheating heat exchange system, the front end of the double preheating heat exchange system is connected to a pipeline system, and the rear end of the double preheating heat exchange system is connected to a gas internal combustion burner system 5; one side of the double preheating heat exchange system is connected to an induced draft system, and the other side is connected to a flue gas branch pipeline 8; the pipeline system and the gas internal combustion burner system 5 are respectively connected to a PLC system 9.

[0030] The pipeline system includes a gas pipeline system 1, an oxygen pipeline system 2, a nitrogen purge pipeline system 3, and a combustion-supporting air pipeline system 4; the gas pipeline system 1 includes a gas pipeline, the combustion-supporting air pipeline system 4 includes an air pipeline, and the ends of the air pipeline and the gas pipeline are respectively connected to the front end of the double preheating heat exchange system; the nitrogen purge pipeline system 3 includes a nitrogen pipeline, and the end of the nitrogen pipeline is connected to the gas pipeline; the oxygen pipeline system 4 includes an oxygen pipeline, and the end of the oxygen pipeline is connected to the air pipeline;

[0031] The gas pipeline is provided with a manual butterfly valve 101, a manual blind plate valve 102, a gas pressure transmitter 103, a gas flow meter 104, a gas regulating valve 105, and a gas quick-cut valve 106 which are connected in sequence; a gas inlet is provided at the front end of the gas pipeline;

[0032] The oxygen pipeline is provided with a manual ball valve 201, a flame arrester 202, an oxygen regulating valve 203, and an oxygen flow meter 204 which are connected in sequence; the front end of the oxygen pipeline is provided with an oxygen inlet;

[0033] The air pipeline is provided with a blower 401, an air pressure transmitter 402, an air regulating valve 403, and an air flow meter 404 which are connected in sequence; the end of the oxygen pipeline is connected to the pipeline at the rear end of the air flow meter 404; the front end of the air pipeline is provided with an air inlet;

[0034] The nitrogen pipeline is provided with a nitrogen purge solenoid valve 301 and a nitrogen purge quick-cut valve connected in parallel; the end of the nitrogen purge quick-cut valve is connected to the gas quick-cut valve 106, and the end of the nitrogen purge solenoid valve 301 is connected to the pipeline at the rear end of the gas quick-cut valve 106.

[0035] The gas internal combustion burner system 5 includes a burner. The induced draft system includes an induced draft fan 6 and an induced draft duct connected in sequence. The dual preheating heat exchange system includes a dual preheating heat exchanger 7.

[0036] The gas internal combustion burner system is provided with 8 burners.

[0037] Burner structure Figure 2As shown, it includes a gas tee 509; a burner outer tube 512 is provided on the outside of the lower end of the gas tee 509, and a burner outer tube interface 515 is provided on the upper end of the burner outer tube 512, and the burner outer tube interface 515 is connected to an oxygen pipeline; the gas tee 509 is connected to the gas pipeline through a convex flange provided on the vertical end face of the gas tee 509; a convex flat welding flange 507 is sleeved on the outer wall of the upper port of the gas tee 509, and an upper cover plate 505 connected to the convex flat welding flange 507 is provided on the top of the gas tee 509, a positioning hole is provided in the center of the upper cover plate 505, and a sleeve 516 is provided in the positioning hole, and the sleeve 516 passes through the upper cover plate 505 and is arranged inside the gas tee 509, and the sleeve 516 A diameter-adjusting tube 518 is provided at the inner center, and a diameter-adjusting screw 508 is provided inside the diameter-adjusting tube 518; a conical valve 514 is provided at the lower end of the gas tee 509, and the conical valve 514 provided at the gas outlet of the gas tee 509 has a turbulent effect and is mixed with oxygen at the same time; a burner upper cover plate 510 is connected to the outer wall of the lower end of the gas tee 509, and the burner upper cover plate 510 is connected to the burner outer tube 512, and a burner combustion tube 511 is provided at the center of the burner outer tube 512, and the lower end of the diameter-adjusting tube 518 passes through the conical valve 514 and is located in the burner combustion tube 511, and a number of stabilizing rods are provided circumferentially inside the burner combustion tube 511; a burner flange 513 for connecting to the cover of the intermediate ladle baking device is connected to the outer wall of the bottom end of the burner outer tube 512.

[0038] The gas tee 509 passes through the burner upper cover plate 510 and enters the burner combustion tube 511 .

[0039] The burner outer tube interface 515 is connected to the end of the oxygen pipeline, and the front end of the oxygen pipeline is provided with an oxygen interface. The gas tee 509 is connected to the end of the gas pipeline, and the front end of the gas pipeline is provided with a gas interface.

[0040] The burner outer tube 512 is welded to the outside of the lower end of the gas tee 509 .

[0041] The vertical end face of the gas tee 509 is provided with a convex flange; the convex flange is fixed to the vertical end face of the gas tee 509 by a positioning nut.

[0042] An adjusting hand wheel 502 is provided above the upper cover plate 505; the adjusting hand wheel 502 is connected to the top of the diameter adjusting screw 508 through a positioning nut A 501, the upper end of the sleeve 516 is open, and a sealing end plate 503 is provided at the opening of the upper end of the sleeve 516; a sealing ring 504 is provided at the connection between the diameter adjusting screw 508 and the sealing end plate 503, and a central hole for the diameter adjusting tube 518 to pass through is opened at the lower end of the sleeve 516.

[0043] An adjusting nut 519 is provided at the top of the diameter adjusting tube 518 , and the diameter adjusting screw rod 508 passes through the adjusting nut 519 and is placed in the diameter adjusting tube 518 .

[0044] The horizontal plane of the upper end of the sleeve 516 is located between the adjusting hand wheel 502 and the upper cover plate 505 .

[0045] The sealing ring 504 is an O-ring. The plurality of stabilizing rods are arranged in an eight-shaped structure. A certain number of eight-shaped stabilizing rods are installed in the lower part of the burner to ensure stable combustion and prevent flameout.

[0046] The sleeve 516 is connected to the diameter-adjusting tube 518 via a positioning screw 517 .

[0047] The upper cover plate 505 and the convex flat welding flange 507 are connected by a plurality of bolts and a plurality of positioning nuts B6.

[0048] The gas pressure transmitter 103, gas flow meter 104, gas regulating valve 105, gas quick-cut valve 106, oxygen regulating valve 203, oxygen flow meter 204, air pressure transmitter 402, air regulating valve 403, air flow meter 404, nitrogen purge solenoid valve 301, and nitrogen purge quick-cut valve are respectively connected to the PLC system 9.

[0049] The gas pipeline system is provided with a low pressure alarm device and a gas concentration detection alarm device. The burner is provided with an automatic igniter and an ultraviolet flame detector. The burner is also provided with a heat shield, and an infrared temperature sensor is provided on the heat shield. The low pressure alarm device and the gas concentration detection alarm device are sound and light alarms. The low pressure alarm device, the gas concentration detection alarm device, the automatic igniter, the ultraviolet flame detector, and the infrared temperature sensor are connected to the PLC system 9 respectively.

[0050] The gas quick-cut valve 106 is a gas pneumatic quick-cut valve, and the gas regulating valve 105 is an electric gas regulating valve.

[0051] The nitrogen pipeline is also provided with a nitrogen regulating valve, and the induced air pipeline is also provided with an induced air manual butterfly valve.

[0052] The gas pipeline system 1 is used to provide blast furnace gas to the burner, and the nitrogen purge pipeline system 3 connected to the gas pipeline is used to exhaust the gas in the burner before the burner is ignited and when it is stopped.

[0053] The combustion-supporting air pipeline system 4 introduces air through the blower 401, mixes with oxygen in the oxygen pipeline to form combustion-supporting gas and sends it to the double preheating heat exchanger 7. By real-time controlling the oxygen concentration of the combustion-supporting gas according to the calorific value of the blast furnace gas, sufficient combustion is ensured. The double preheating heat exchanger 7 uses the waste heat of the hot flue gas introduced by part of the induced draft fan 6 to first heat the combustion-supporting gas to 500°C, and then preheat the blast furnace gas to 400°C.

[0054] The double preheating heat exchange system extracts part of the high-temperature flue gas discharged from inside and outside the tundish, and preheats the blast furnace gas and combustion-supporting gas passing through the double preheating heat exchanger 7. The induced draft system provides a heat source to the double preheating heat exchange system, and the hot flue gas is extracted by the induced draft system and enters the double preheating heat exchange system to preheat the combustion-supporting air and blast furnace gas.

[0055] One end of the double preheating heat exchanger 7 is connected to a cold air inlet pipe, and the other end thereof is connected to a reducer burner; one end of the double preheating heat exchanger 7 is connected to a gas pipeline, and the other end thereof is connected to the burner through a gas pipeline; the double preheating heat exchanger 7 is connected to an air outlet through a reducer pipe;

[0056] When the tundish is working, the burner introduces blast furnace gas through the gas tee 509. When the blast furnace gas passes through the conical valve 514, the flow rate increases due to the sudden decrease in cross-sectional area. The blower sends the combustion-supporting gas into the burner through the burner outer tube 515. After passing through the conical valve 514, the blast furnace gas and the combustion-supporting gas are mixed inside the burner combustion tube and begin to burn. The exhaust gas generated during baking is extracted by the induced draft fan 6 to preheat the combustion-supporting gas and blast furnace gas, thereby effectively improving the combustion efficiency and energy utilization rate. Moreover, due to the use of internal combustion and oxygen-enriched combustion, the flame is ejected from the burner under the action of blast furnace gas pressure, acceleration of the conical valve 514 and thermal expansion of the gas, with strong combustion impact and high flame temperature.

[0057] The burner uses a burner outer tube structure to preheat the combustion-supporting gas and cool the burner. Multiple flame stabilizing rods are installed in the burner to ensure that the flame is fully burned in the burner before it is ejected from the burner, and the flame is not easy to extinguish. At the same time, since the entire device constitutes oxygen-enriched combustion, high-oxygen gas is used instead of air to support combustion, which increases the flame temperature. And because the nitrogen content is greatly reduced, No x The amount generated also decreases.

[0058] The nitrogen purge quick-cut valve and nitrogen purge solenoid valve 301 are used to purge the gas before the device is ignited and after it is shut down. The gas pneumatic quick-cut valve has the function of opening and emergency cutting off the blast furnace gas during use. The infrared temperature sensor is used to monitor the temperature of the bottom of the tundish in real time during baking.

[0059] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A tundish baking device with high baking temperature using blast furnace gas, characterized in that: It comprises a double preheating heat exchange system, wherein the front end of the double preheating heat exchange system is connected to a pipeline system, and the rear end of the double preheating heat exchange system is connected to a gas internal combustion burner system (5); one side of the double preheating heat exchange system is connected to an induced draft system, and the other side is connected to a flue gas branch pipeline (8); the pipeline system and the gas internal combustion burner system (5) are respectively connected to a PLC system (9); The pipeline system comprises a gas pipeline system (1), an oxygen pipeline system (2), a nitrogen purge pipeline system (3), and a combustion-supporting air pipeline system (4); the gas pipeline system (1) comprises a gas pipeline, the combustion-supporting air pipeline system (4) comprises an air pipeline, and the ends of the air pipeline and the gas pipeline are respectively connected to the front end of the double preheating heat exchange system; the nitrogen purge pipeline system (3) comprises a nitrogen pipeline, and the end of the nitrogen pipeline is connected to the gas pipeline; the oxygen pipeline system (2) comprises an oxygen pipeline, and the end of the oxygen pipeline is connected to the air pipeline; The gas pipeline is provided with a manual butterfly valve (101), a manual blind plate valve (102), a gas pressure transmitter (103), a gas flow meter (104), a gas regulating valve (105), and a gas quick-cut valve (106) which are connected in sequence; a gas inlet is provided at the front end of the gas pipeline; The oxygen pipeline is provided with a manual ball valve (201), a flame arrester (202), an oxygen regulating valve (203), and an oxygen flow meter (204) which are connected in sequence; and an oxygen inlet is provided at the front end of the oxygen pipeline; The air pipeline is provided with a blower (401), an air pressure transmitter (402), an air regulating valve (403), and an air flow meter (404) which are connected in sequence; the end of the oxygen pipeline is connected to the pipeline at the rear end of the air flow meter (404); and the front end of the air pipeline is provided with an air inlet; The nitrogen pipeline is provided with a nitrogen purge solenoid valve (301) and a nitrogen purge quick-cut valve connected in parallel; the end of the nitrogen purge quick-cut valve is connected to the gas quick-cut valve (106), and the end of the nitrogen purge solenoid valve (301) is connected to the pipeline at the rear end of the gas quick-cut valve (106); The gas internal combustion burner system (5) comprises a burner; the induced draft system comprises an induced draft fan (6) and an induced draft duct connected in sequence; the dual preheating heat exchange system comprises a dual preheating heat exchanger (7); The burner comprises a gas tee (509); a burner outer tube (512) is provided on the outside of the lower end of the gas tee (509); a burner outer tube interface (515) is provided on the upper end of the burner outer tube (512); the burner outer tube interface (515) is connected to an oxygen pipeline; the gas tee (509) is connected to the gas pipeline via a convex flange provided on the vertical end face of the gas tee (509); a convex flat-weld flange (507) is sleeved on the outer wall of the upper end of the gas tee (509); an upper cover plate (505) connected to the convex flat-weld flange (507) is provided on the top of the gas tee (509); a positioning hole is provided at the center of the upper cover plate (505); a sleeve (516) is provided in the positioning hole; the sleeve (516) passes through the upper cover plate (505) and is provided inside the gas tee (509); the sleeve (516) ) is provided with a diameter-adjusting tube (518) at the center thereof, and a diameter-adjusting screw (508) is provided inside the diameter-adjusting tube (518); a conical valve (514) is provided at the lower end of the gas tee (509); the conical valve (514) provided at the gas outlet of the gas tee (509) has a flow disturbance function and is mixed with oxygen at the same time; the outer wall at the lower end of the gas tee (509) is connected with a burner upper cover plate (510), the burner upper cover plate (510) is connected with a burner outer tube (512), a burner combustion tube (511) is provided at the center of the burner outer tube (512), the lower end of the diameter-adjusting tube (518) passes through the conical valve (514) and is located inside the burner combustion tube (511), and a plurality of combustion stabilizing rods are provided in the inner ring of the burner combustion tube (511); the outer wall at the bottom end of the burner outer tube (512) is connected with a burner flange (513) for connecting with the cover of the tundish baking device; The gas pressure transmitter (103), the gas flow meter (104), the gas regulating valve (105), the gas quick-cut valve (106), the oxygen regulating valve (203), the oxygen flow meter (204), the air pressure transmitter (402), the air regulating valve (403), the air flow meter (404), the nitrogen purge solenoid valve (301), and the nitrogen purge quick-cut valve are respectively connected to the PLC system (9); The gas pipeline system is provided with a low pressure alarm device and a gas concentration detection alarm device; the burner is provided with an automatic igniter and an ultraviolet flame detector; the burner is also provided with a heat insulation cover, and the heat insulation cover is provided with an infrared temperature sensor; the low pressure alarm device and the gas concentration detection alarm device are sound and light alarms; the low pressure alarm device, the gas concentration detection alarm device, the automatic igniter, the ultraviolet flame detector, and the infrared temperature sensor are respectively connected to the PLC system (9); The gas tee (509) passes through the burner upper cover plate (510) and enters the burner combustion tube (511).

2. A blast furnace gas high baking temperature tundish baking device as claimed in claim 1, characterized in that: The gas quick-cut valve (106) is a gas pneumatic quick-cut valve, and the gas regulating valve (105) is an electric gas regulating valve.

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