Heating furnace safe starting and furnace burning control system for hydrogen-based shaft furnace

Abstract

The utility model discloses a heating furnace safe starting and furnace burning control system for a hydrogen-based shaft furnace. The heating furnace safe starting and furnace burning control system comprises a heating furnace body, a bottom gas pipeline, a main fuel gas pipeline, a process tail gas pipeline, a bottom gas diffusion tower, a main fuel gas diffusion tower and a process waste gas diffusion tower. A heating furnace burner is arranged in the heating furnace main body; the heating furnace burner is provided with a bottom fire hole and a main fire hole; one end of the bottom gas pipeline and one end of the main gas pipeline are communicated with the gas pipeline, the other end of the bottom gas pipeline is communicated with a bottom fire hole of the heating furnace burner, and the other end of the main gas pipeline is communicated with a main fire hole of the heating furnace burner; a bottom gas front stop valve and a bottom gas rear stop valve are arranged on the bottom gas pipeline, and the bottom gas pipeline between the bottom gas front stop valve and the bottom gas rear stop valve is communicated with a bottom gas diffusion tower through a bottom gas diffusion valve; the main gas pipeline is provided with a main gas front stop valve and a main gas rear stop valve. The control system can effectively realize ignition control of the heating furnace so as to achieve the purpose of safe and stable production.

Description

Technical Field

[0001] The utility model relates to a hydrogen-based vertical furnace system, in particular to a heating furnace safety start-up and furnace burning control system for a hydrogen-based vertical furnace. Background Art

[0002] At present, hydrogen-based shaft furnace direct iron reduction technology has been widely used as the main non-blast furnace ironmaking technology. Hydrogen-based shaft furnace smelting has many advantages, including low energy consumption, short process, energy saving and emission reduction. This technology can not only significantly improve the quality of steel products, but also greatly reduce the carbon emissions per ton of steel products. At present, the application of hydrogen-based shaft furnace technology is rapidly expanding and has become the main direction of the green and low-carbon transformation and development of the steel industry.

[0003] In the production process of hydrogen-based vertical furnace, the temperature of process gas at the inlet of vertical furnace must reach a high level, which needs to be greater than 1000℃ to meet the requirements of hydrogen-based vertical furnace smelting; therefore, the hydrogen-based vertical furnace system has extremely high performance requirements for process gas heating equipment - "heating furnace", which not only requires the heating furnace to have a high combustion chamber temperature, but also must be able to operate safely, efficiently and stably for a long period of time. Therefore, the safe startup and burning control of the heating furnace are of great significance to the entire hydrogen-based vertical furnace direct reduction plant.

[0004] At present, the tubular heating furnaces used in the industrial field usually have a low operating temperature of less than 700°C, and the working conditions are also very different from those of hydrogen-based direct reduction plants. If similar startup and furnace burning control systems are used, there will not only be certain safety hazards, but also be detrimental to maximizing energy efficiency. Therefore, with the vigorous development of hydrogen-based vertical furnace direct reduction technology, the industry urgently needs a heating furnace safe and fast startup and furnace burning control system that can perfectly match the production conditions of hydrogen-based direct reduction vertical furnaces, so as to achieve efficient and stable operation of the entire plant. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a safe and controllable hydrogen-based vertical furnace heating furnace safety start-up and furnace burning control system.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: it includes a heating furnace body, a bottom gas pipeline, a main gas pipeline, a process tail gas pipeline, a bottom gas dispersing tower, a main gas dispersing tower and a process waste gas dispersing tower; a heating furnace burner is arranged in the heating furnace body, and the heating furnace burner is provided with a bottom fire port and a main fire port; one end of the bottom gas pipeline and the main gas pipeline are both connected to the gas pipeline, and the other end of the bottom gas pipeline is connected to the bottom fire port of the heating furnace burner, and the other end of the main gas pipeline is connected to the main fire port of the heating furnace burner; the bottom gas pipeline is provided with a bottom gas front stop valve and a bottom gas rear stop valve, and the bottom gas front stop valve and the bottom gas rear stop valve are connected to each other. The bottom gas pipeline between the gas rear stop valves is connected to the bottom gas release tower through the bottom gas release valve; the main gas pipeline is provided with a main gas front stop valve and a main gas rear stop valve, and the main gas pipeline between the main gas front stop valve and the main gas rear stop valve is connected to the main gas release tower through the main gas release valve; one end of the process tail gas pipeline is connected to the process tail gas treatment device, and the other end is connected to the main fire port of the heating furnace burner. The process exhaust gas pipeline is provided with a process waste gas front stop valve and a process waste gas rear stop valve, and the process exhaust gas pipeline between the process waste gas front stop valve and the process waste gas rear stop valve is connected to the process waste gas release tower through the process waste gas release valve.

[0007] Furthermore, a main gas flow regulating valve is also provided on the main gas pipeline.

[0008] Furthermore, a bottom gas pressure regulating valve is also provided on the bottom gas pipeline.

[0009] Furthermore, a process exhaust gas flow regulating valve is also provided on the process tail gas pipeline.

[0010] Furthermore, a pressure gauge is provided on the bottom gas pipeline between the bottom gas front stop valve and the bottom gas rear stop valve.

[0011] The beneficial effects of adopting the above technical solution are: there are significant differences between hydrogen metallurgical heating furnaces and traditional blast furnace heating furnaces, mainly in terms of higher working pressure and higher hydrogen content in the raw fuel, which makes the danger of fuel gas more prominent; based on this feature, the utility model can take emergency measures by controlling each valve in abnormal situations through the setting of multiple valves of the bottom gas, main fuel gas and process tail gas pipelines. The utility model can effectively realize the ignition control of the heating furnace, thereby achieving the purpose of safe and stable production, which not only improves the safety of the production process, but also ensures the production efficiency and product quality of the factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a structural schematic diagram of the heating furnace burner of the utility model.

[0015] In the figure: 1. process gas inlet; 2. process gas outlet; 3. gas pipeline; 4. main gas front stop valve; 5. main gas release valve; 6. main gas rear stop valve; 7. main gas flow regulating valve; 8. main gas release tower; 9. bottom gas pressure regulating valve; 10. bottom gas front stop valve; 11. bottom gas release valve; 12. bottom gas rear stop valve; 13. bottom gas release tower; 14. process tail gas pipeline; 15. process waste gas front stop valve; 16. process waste gas rear stop valve; 17. process waste gas flow regulating valve; 18. process waste gas release valve; 19. process waste gas release tower; 20. heating furnace body; 21. flue gas outlet; 22. pressure gauge; 23. heating furnace burner; 24. bottom fire port; 25. main fire port. DETAILED DESCRIPTION

[0016] Figure 1 , 2 As shown, the safe start-up and furnace burning control system for the heating furnace for the hydrogen-based vertical furnace includes a heating furnace body 20, a bottom gas pipeline, a main gas pipeline, a process tail gas pipeline, a bottom gas discharge tower 13, a main gas discharge tower 8 and a process waste gas discharge tower 19. The heating furnace body 20 uses coke oven gas as fuel, and its fuel supply is mainly provided by the bottom gas pipeline and the main gas pipeline; the lower side of the heating furnace body 20 is provided with a process gas inlet 1, the upper part is provided with a process gas outlet 2, and the top is provided with a flue gas outlet 21; the lower part of the heating furnace body 20 is provided with a heating furnace burner 23. Figure 2 As shown, the heating furnace burner 23 is provided with a bottom fire port 24 and a main fire port 25; the bottom fire port 24 uses the flame generated by the bottom gas combustion for the ignition and heating process of the heating furnace body 20, and the main fire port 25 uses the high temperature flame generated by the gas combustion for the heating operation of the heating furnace body 20.

[0017] Figure 1 , 2 As shown, one end of the main gas pipeline of the hydrogen-based vertical furnace heating furnace safety start-up and furnace burning control system is connected to the gas pipeline 3, and the other end is connected to the main fire port 25 of the heating furnace burner; the main gas pipeline is provided with a main gas front stop valve 4 and a main gas rear stop valve 6, and the main gas pipeline between the main gas front stop valve 4 and the main gas rear stop valve 6 is connected to the main gas release tower 8 through the main gas release valve 5. The main gas pipeline is also provided with a main gas flow regulating valve 7. The main gas pipeline is designed to ignite the main flame to ensure the normal operation of the heating furnace; the main gas pipeline is equipped with front and rear stop valves and release valves to control the flow and discharge of gas.

[0018] Figure 1 , 2As shown, one end of the bottom gas pipeline of the hydrogen-based vertical furnace heating furnace safety start-up and furnace burning control system is connected to the fuel gas pipeline 3, and the other end is connected to the bottom fire port 24 of the heating furnace burner; the bottom gas pipeline is provided with a bottom gas front stop valve 10 and a bottom gas rear stop valve 12, and the bottom gas pipeline between the bottom gas front stop valve 10 and the bottom gas rear stop valve 12 is connected to the bottom gas release tower 13 through the bottom gas release valve 11. The bottom gas pipeline is also provided with a bottom gas pressure regulating valve 9, and the bottom gas pipeline between the bottom gas front stop valve 10 and the bottom gas rear stop valve 12 is also provided with a pressure gauge 22. The main function of the bottom gas pipeline is to ignite the bottom gas; the bottom gas pipeline is provided with a stop valve and a release valve to control the inlet, outlet and discharge of the bottom gas, and is equipped with a bottom gas pressure regulating valve 9 and a pressure gauge 22 to ensure the stable supply and pressure control of the bottom gas.

[0019] Figure 1 , 2 As shown, one end of the process tail gas pipeline of the safe start-up and furnace burning control system for the heating furnace of the hydrogen-based vertical furnace is connected to the process tail gas treatment device, and the other end is connected to the main fire port 25 of the heating furnace burner; the process tail gas pipeline is provided with a process waste gas front stop valve 15 and a process waste gas rear stop valve 16, and the process tail gas pipeline between the process waste gas front stop valve 15 and the process waste gas rear stop valve 16 is connected to the process waste gas release tower 19 through the process waste gas release valve 18. The process tail gas pipeline is also provided with a process waste gas flow regulating valve 17. The design of the process tail gas pipeline is to use the process tail gas to replace the traditional coke oven gas for combustion, thereby reducing the production cost; the process tail gas pipeline is provided with front and rear stop valves and a release valve to control the inlet and outlet and discharge of the tail gas, and to ensure the safe operation of the system; the flow regulating valve is equipped to adjust and monitor the flow and pressure of the process tail gas to ensure its stable supply and combustion efficiency.

[0020] Figure 1 , 2 As shown, the control steps of the safe start-up and burning control system of the hydrogen-based vertical furnace heating furnace are as follows:

[0021] 1. Open the bottom gas pressure regulating valve 9, introduce the coke oven gas from the gas pipeline 3 to the bottom gas front stop valve 10 of the bottom gas pipeline, and close the bottom gas release valve 11 and the bottom gas rear stop valve 12 at the same time to ensure the normal gas supply of the bottom gas pipeline. Then, observe the pressure gauge 22 behind the bottom gas front stop valve 10 and continuously monitor the pressure change within 2 minutes. If no pressure change is observed during this period, it means that the bottom gas front stop valve 10 is well sealed, ensuring the air tightness and stability of the system.

[0022] 2. When testing the air tightness of the bottom gas relief valve 11 and the hand valve before the burner, first ensure that the front and rear stop valves of the bottom gas are in the open state, and then close the bottom gas relief valve 11. Next, open the bottom gas pressure regulating valve 9 and adjust the air pressure in the pipeline to about 30kpa to establish the test conditions. Then, close the front stop valve 10 of the bottom gas and start timing for 5 minutes. During this period, monitor the changes in the air pressure in the pipeline. If the pressure reduction is within 5%, it means that the air tightness of the bottom gas relief valve 11 and the hand valve before the burner is good and the test result is qualified.

[0023] 3. When testing the air tightness of the bottom gas stop valve 12, first close the valve, then open the bottom gas release valve 11 to reduce the pressure in the pipeline to zero. Next, close the bottom gas release valve 11 and start observing the changes in the pressure gauge 22. In the next 5 minutes, if the pressure displayed on the pressure gauge drops below 1kpa, it means that the air tightness of the bottom gas stop valve 12 is qualified. Through this strict air tightness test, the reliability and safety of the bottom gas pipeline valve are ensured. Once the air tightness test of the bottom gas pipeline valve is passed, the bottom ignition can be ignited and the subsequent heating furnace operation can be carried out.

[0024] 4. The heating furnace has 30 burners 23 in total, which are distributed in 3 rows, 10 in each row. After the burner test is completed, all 30 bottom burners 24 need to be ignited within 40 minutes. If the bottom burner 24 fails to ignite, immediate measures need to be taken. At this time, first open the bottom gas release valve 11 to release the remaining gas in the pipeline. Then, the remaining gas of the coke oven gas is discharged through the release tower 13 to ensure that the gas in the pipeline is completely removed.

[0025] 5. After all the bottom burners 24 of the 30 heating furnace burners 23 are lit, the main burner 25 is ignited.

[0026] 6. Before igniting the main burner 25, it is necessary to conduct an air tightness test on each valve of the main gas pipeline.

[0027] 7. When testing the air tightness of the main gas front stop valve 4, first ensure that there is a certain pressure before the front stop valve. Then, open the main gas relief valve 5 and the main gas rear stop valve 6 to ensure that the gas in the pipeline can be discharged smoothly. After the pressure gauge 22 shows 0, immediately close the main gas relief valve 5 and the main gas rear stop valve 6, and start to observe the changes in the pressure gauge 22. In the next 5 minutes, if the pressure displayed on the pressure gauge drops below 1kpa, it means that the air tightness of the main gas front stop valve 4 is qualified.

[0028] 8. When testing the air tightness of the main gas relief valve 5 and the hand valve before the main burner, first ensure that the main gas front and rear stop valves are in the open state. Then, close the main gas relief valve 5, open the main gas flow regulating valve 7, and adjust the air pressure in the pipeline to about 30kpa. Then, close the main gas front stop valve 4 and start timing for 5 minutes. During this period, monitor the changes in the air pressure in the pipeline. If the pressure drop is within 5%, it means that the air tightness of the main gas relief valve 5 and the hand valve before the main burner is good and the test result is qualified.

[0029] 9. When testing the air tightness of the main gas rear stop valve 6, first ensure that the valve is closed and open the main gas release valve 5 to ensure that the gas in the pipeline can be discharged smoothly. Then, wait for the pressure gauge 22 to display 0, immediately close the main gas release valve 5, and start to observe the changes in the pressure gauge. In the next 15 minutes, if the pressure displayed on the pressure gauge drops below 1kpa, it means that the air tightness of the main gas rear stop valve 6 is qualified.

[0030] 10. After the air tightness test of the main gas pipeline is passed, the main fire port 25 of the heating furnace burner 23 can be ignited to heat the heating furnace.

[0031] 11. After the heating and ignition are completed, when process waste gas is generated, using the process waste gas to burn the furnace can save costs.

[0032] 12. First analyze the composition of process waste gas. When the process waste gas analysis is qualified and meets the combustion conditions, merge it into the process waste gas.

[0033] 13. Open the process waste gas front stop valve 15 and the process waste gas rear stop valve 16, and close the process waste gas release valve 19.

[0034] 14. Control the process waste gas flow regulating valve 17 according to the required temperature of the heating furnace.

[0035] 15. When an abnormal situation occurs during the heating furnace burning, emergency measures must be taken immediately to ensure safety. First, close the main gas front stop valve 4, the main gas rear stop valve 6 and the main gas flow regulating valve 7 at the same time to stop the supply and regulation of the main gas. Next, close the bottom gas pressure regulating valve 9, the bottom gas front stop valve 10 and the bottom gas rear stop valve 12 to stop the supply of bottom gas. At the same time, close the process waste gas front stop valve 15 and the process waste gas rear stop valve 16 to stop the discharge of process waste gas. Finally, while closing the process waste gas regulating valve 17, open the main gas release valve 5, the bottom gas release valve 11 and the process waste gas release valve 18 to release the gas in the pipeline.

Claims

1. A safe start-up and burning control system for a hydrogen-based vertical furnace heating furnace, characterized in that: The invention comprises a heating furnace body (20), a bottom gas pipeline, a main gas pipeline, a process tail gas pipeline, a bottom gas dispersing tower (13), a main gas dispersing tower (8) and a process waste gas dispersing tower (19); a heating furnace burner (23) is arranged in the heating furnace body (20), and the heating furnace burner is provided with a bottom fire port (24) and a main fire port (25); one end of the bottom gas pipeline and the main gas pipeline are both connected to the gas pipeline (3), the other end of the bottom gas pipeline is connected to the bottom fire port (24) of the heating furnace burner, and the other end of the main gas pipeline is connected to the main fire port (25) of the heating furnace burner; the bottom gas pipeline is provided with a bottom gas front stop valve (10) and a bottom gas rear stop valve (12), and the bottom gas pipeline between the bottom gas front stop valve (10) and the bottom gas rear stop valve (12) is The main gas pipeline is connected to a bottom gas dispersing tower (13) through a bottom gas dispersing valve (11); the main gas pipeline is provided with a main gas front stop valve (4) and a main gas rear stop valve (6); the main gas pipeline between the main gas front stop valve (4) and the main gas rear stop valve (6) is connected to a main gas dispersing tower (8) through a main gas dispersing valve (5); one end of the process tail gas pipeline is connected to a process tail gas treatment device, and the other end is connected to a main fire port (25) of a heating furnace burner; the process tail gas pipeline is provided with a process waste gas front stop valve (15) and a process waste gas rear stop valve (16); the process waste gas pipeline between the process waste gas front stop valve (15) and the process waste gas rear stop valve (16) is connected to a process waste gas dispersing tower (19) through a process waste gas dispersing valve (18).

2. A safe start-up and furnace burning control system for a hydrogen-based vertical furnace according to claim 1, characterized in that: The main gas pipeline is also provided with a main gas flow regulating valve (7).

3. The safe start-up and burning control system for a hydrogen-based vertical furnace heating furnace according to claim 1 is characterized in that: The bottom gas pipeline is also provided with a bottom gas pressure regulating valve (9).

4. The safe start-up and burning control system for a hydrogen-based vertical furnace heating furnace according to claim 1 is characterized in that: The process tail gas pipeline is also provided with a process waste gas flow regulating valve (17).

5. A safe start-up and furnace burning control system for a hydrogen-based vertical furnace heating furnace according to any one of claims 1 to 4, characterized in that: A pressure gauge (22) is also provided on the bottom gas pipeline between the bottom gas front stop valve (10) and the bottom gas rear stop valve (12).

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