Double-gas ignition furnace

Abstract

The utility model discloses a double-gas ignition furnace, which belongs to the technical field of ferrous metallurgy and comprises a plurality of ignition nozzles arranged in the ignition furnace, M gas pipelines and M combustion-supporting air pipelines, and the M gas pipelines and the M combustion-supporting air pipelines are arranged above the ignition furnace. The gas inlet of each gas pipeline is also connected with a blast furnace gas pipeline and / or a coke oven gas pipeline for providing fuel; a gas outlet of each gas pipeline is connected with gas inlets of a plurality of ignition nozzles through ignition nozzle pipelines; the air inlet of each ignition nozzle pipeline is further connected with a combustion-supporting air pipeline used for providing combustion-supporting air. An air blower is arranged at an air inlet of the combustion-supporting air pipeline; wherein the blast furnace gas pipeline, the coke oven gas pipeline, the combustion-supporting air pipeline and the ignition nozzle pipeline are respectively provided with a plurality of valves; m is a natural number not less than 3; the ignition furnace effectively solves the technical problem that the ignition furnace in the prior art cannot flexibly use blast furnace gas and / or coke oven gas as fuel.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel metallurgy, and in particular relates to a double-gas ignition furnace. Background Art

[0002] As we all know, an ignition furnace is a device used to ignite and burn gas, and is widely used in industries such as metallurgy and chemical engineering. Traditional ignition furnaces typically use a single type of gas as fuel, such as blast furnace gas or coke oven gas, and achieve the combustion process by controlling the supply of gas and combustion air.

[0003] Currently, existing ignition furnaces typically utilize a single gas pipeline design, with valves controlling the gas supply and a blower providing combustion air. Ignition nozzles are distributed throughout the furnace to achieve gas combustion. This design satisfies basic combustion requirements to a certain extent.

[0004] However, traditional ignition furnaces have many technical problems, including: unreasonable structural design, difficulty in achieving flexible switching and mixed use of blast furnace gas and coke oven gas, which limits the diversity and economy of fuel; imperfect control systems, difficulty in achieving precise flow control and rapid shut-off, posing safety hazards.

[0005] The above problems seriously restrict the performance and application scope of the ignition furnace. Therefore, the present invention provides a new dual-gas ignition furnace that can use blast furnace gas and / or coke oven gas to solve these technical problems. Utility Model Content

[0006] The purpose of the utility model is to provide a dual-gas ignition furnace to solve the technical problem in the prior art that the ignition furnace cannot flexibly use blast furnace gas and / or coke oven gas as fuel.

[0007] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0008] A dual-gas ignition furnace comprises a plurality of ignition nozzles arranged in the ignition furnace, M gas pipes and M combustion-supporting air pipes arranged above the ignition furnace, the air inlet of each gas pipe is also connected to a blast furnace gas pipe and / or a coke oven gas pipe for supplying fuel; the air outlet of each gas pipe is connected to the air inlets of the plurality of ignition nozzles through an ignition nozzle pipe; the air inlet of each ignition nozzle pipe is also connected to a combustion-supporting air pipe for supplying combustion-supporting air; the air inlet of the combustion-supporting air pipe is provided with a blower; wherein,

[0009] The blast furnace gas pipeline, the coke oven gas pipeline, the combustion air pipeline and the ignition nozzle pipeline are respectively provided with a plurality of valves; M is a natural number not less than 3.

[0010] Preferably, one or two combustion-supporting air ducts are provided between every two gas pipelines to ensure uniform distribution of gas and combustion-supporting air and improve combustion efficiency and stability.

[0011] Preferably, the dual gas ignition furnace includes N ignition nozzles, each gas pipeline is connected to N / M ignition nozzles through N / M ignition nozzle pipelines, and N and N / M are natural numbers not less than 3; it is used to achieve uniform distribution of the ignition nozzles and ensure uniform heating of the entire ignition furnace.

[0012] Preferably, butterfly valves, blind plate valves, regulating valves and quick-cut valves are respectively provided on the blast furnace gas pipeline and the coke oven gas pipeline from the air inlet to the air outlet, so as to achieve precise control and quick shut-off of the gas flow, thereby improving the reliability and safety of the system.

[0013] Preferably, a blast furnace gas ignition nozzle front valve is provided at the connection between the blast furnace gas pipeline and each gas pipeline; a coke oven gas ignition nozzle front valve is provided at the connection between the coke oven gas pipeline and each gas pipeline; and the valve redundancy design is used to improve operational safety.

[0014] Preferably, a blast furnace gas ignition nozzle front pipe and a coke oven gas ignition nozzle front pipe are further provided between the gas pipeline and the ignition nozzle pipeline, a blast furnace gas ignition nozzle front valve is provided on the blast furnace gas ignition nozzle front pipe, and a coke oven gas ignition nozzle front valve is provided on the coke oven gas ignition nozzle front pipe; the diameter of the blast furnace gas ignition nozzle front pipe is larger than the diameter of the coke oven gas ignition nozzle front pipe; a combustion-supporting air ignition nozzle front pipe is provided between the combustion-supporting air pipe and the ignition nozzle pipeline, and a combustion-supporting air ignition nozzle front valve is provided on the combustion-supporting air ignition nozzle front pipe; a ball valve is provided on the ignition nozzle pipeline; it is convenient to control the gas supply of each ignition nozzle and realize flexible ignition control.

[0015] Preferably, a vent pipe for removing foreign gas from the gas pipe is provided at the upper end of the gas outlet, and a vent valve is provided on the vent pipe for discharging air from the pipe before ignition.

[0016] Preferably, the air inlet of the gas pipeline is also connected to the air outlet of the purge pipeline, and the air inlet of the purge pipeline is connected to the steam supply system or the nitrogen supply system; and cooperates with the vent pipe to ensure that the impurities in the pipeline can be effectively removed before the gas is delivered.

[0017] Preferably, an explosion relief valve is provided on the combustion-supporting air duct; the air inlet of the combustion-supporting air duct is connected to the same combustion-supporting air main pipe; a combustion-supporting air ignition nozzle front valve is provided at the connection between the combustion-supporting air main pipe and each combustion-supporting air duct; a blower is provided at the air inlet of the combustion-supporting air main pipe, and a combustion-supporting air regulating valve is provided on the combustion-supporting air main pipe.

[0018] Preferably, among the three gas pipelines, all three gas pipelines are connected to the blast furnace gas pipeline, and the two gas pipelines located on both sides are connected to the coke oven gas pipeline.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] The utility model provides a dual-gas ignition furnace, which effectively solves the technical problem that the ignition furnace in the prior art cannot flexibly use blast furnace gas and / or coke oven gas as fuel; the utility model designs multiple parallel gas pipelines, each pipeline can be connected to blast furnace gas and / or coke oven gas, and a blast furnace gas ignition nozzle front pipeline and a coke oven gas ignition nozzle front pipeline are arranged between the gas pipeline and the ignition nozzle pipeline, so as to realize flexible switching and mixed use of blast furnace gas and coke oven gas; the utility model allows the use of blast furnace gas, coke oven gas or a mixture of the two as fuel, and can be used according to actual needs and The fuel composition can be flexibly adjusted according to the gas supply situation to optimize resource utilization; the utility model also provides a vent pipe and a purge pipe to remove the miscellaneous gas in the pipe, and an explosion relief valve is provided on the combustion-supporting air pipe. A valve redundancy design is adopted, such as valves are provided at the connection between the gas pipe and the blast furnace / coke oven gas pipe, which improves the safety of the dual-gas ignition furnace; through the above-mentioned technical means, the dual-gas ignition furnace of the utility model not only solves the limitations of traditional ignition furnaces, but also greatly improves the flexibility, economy and safety of the ignition furnace, providing a better solution for industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic top view of the ignition furnace pipeline in the preferred embodiment of the present utility model;

[0022] Figure 2 This is a side view schematic diagram of the ignition furnace pipeline in the preferred embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the connection of the ignition nozzle pipe in the preferred embodiment of the present utility model.

[0024] In the figure: 1. Ignition nozzle; 2. Gas pipeline; 3. Combustion-supporting air pipeline; 4. Blast furnace gas pipeline; 5. Coke oven gas pipeline; 6. Ignition nozzle pipeline; 7. Butterfly valve; 8. Blind plate valve; 9. Regulating valve; 10. Quick-cut valve; 11. Ball valve; 12. Vent pipe; 13. Purge pipeline; 14. Explosion relief valve; 15. Valve in front of blast furnace gas ignition nozzle; 16. Valve in front of coke oven gas ignition nozzle; 17. Valve in front of combustion-supporting air ignition nozzle; 18. Vent valve; 19. Combustion-supporting air regulating valve; 20. Pipe in front of blast furnace gas ignition nozzle; 21. Pipe in front of coke oven gas ignition nozzle; 22. Pipe in front of combustion-supporting air ignition nozzle. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] like Figure 1-Figure 3 As shown:

[0027] First preferred embodiment:

[0028] A dual-gas ignition furnace comprises N ignition nozzles 1 arranged in the ignition furnace, M gas pipes 2 and M combustion-supporting air pipes 3 arranged in parallel above the ignition furnace, and one or two combustion-supporting air pipes 3 are arranged between every two gas pipes 2 to ensure uniform distribution of gas and combustion-supporting air, thereby improving combustion efficiency and stability;

[0029] The gas inlet of each gas pipeline 2 is also connected to a blast furnace gas pipeline 4 and / or a coke oven gas pipeline 5 for providing fuel;

[0030] The gas outlet of each gas pipe 2 is connected to the gas inlet of the ignition nozzle 1 through the ignition nozzle pipe 6;

[0031] The air inlet of each ignition nozzle pipe 6 is also connected to a combustion-supporting air pipe 3 for providing combustion-supporting air; the combustion-supporting air pipe 3 is provided with an explosion relief valve 14; the air inlet of the combustion-supporting air pipe 3 is connected to the same combustion-supporting air main pipe, and a valve is provided at the connection between the combustion-supporting air main pipe and each combustion-supporting air pipe 3; the air inlet of the combustion-supporting air main pipe is provided with a blower, and the combustion-supporting air main pipe is provided with a combustion-supporting air regulating valve 19;

[0032] in:

[0033] Several valves are respectively provided on the blast furnace gas pipeline 4, coke oven gas pipeline 5, combustion air pipeline 3 and ignition nozzle pipeline 6; each gas pipeline 2 is connected to N / M ignition nozzles 1 through N / M ignition nozzle pipelines 6; N, M and N / M are all natural numbers not less than 3; they are used to achieve uniform distribution of the ignition nozzles 1 and ensure uniform heating of the entire ignition furnace.

[0034] In this embodiment, N is 42, M is 3, and N / M is 14, that is, the dual gas ignition furnace includes three gas pipelines 2, and the gas outlet of each gas pipeline 2 is connected to 14 ignition nozzles 1 through 14 ignition nozzle pipelines 6 respectively; among the three gas pipelines 2, the three gas pipelines 2 are connected to the blast furnace gas pipeline 4, and the two gas pipelines 2 located on both sides are connected to the coke oven gas pipeline 5; since the calorific value of coke oven gas is higher than that of blast furnace gas, two coke oven gas pipelines 5 can meet production needs; two or three of the three blast furnace gas pipelines 4 can be opened according to production needs.

[0035] The upper end of the gas outlet of the gas pipeline 2 is also provided with a vent pipe 12 for removing foreign gases in the pipeline. The vent pipe 12 is provided with a vent valve 18 for discharging air, steam and other foreign gases in the pipeline before ignition, so as to facilitate the completion of the gas explosion test and ensure that the pipeline is filled with the required gas to prepare for safe ignition.

[0036] The blast furnace gas pipeline 4 and the coke oven gas pipeline 5 are respectively provided with a butterfly valve 7, a blind plate valve 8, a regulating valve 9 and a quick-cut valve 10 from the air inlet to the air outlet; they are used to achieve precise control and quick cutting of the gas flow, thereby improving the reliability and safety of the system.

[0037] Specifically, butterfly valves 7 are used for on / off control and regulation, typically shutting off or opening fluids within pipelines. Due to their simple structure, easy operation, excellent sealing, and low cost, butterfly valves 7 are widely used to control various fluid pipelines. The butterfly valves 7 open and close by rotating the valve disc, enabling rapid opening and closing, and can also be used for flow regulation. They are characterized by low flow resistance.

[0038] The blind plate valve 8 is used for safety isolation, completely shutting off the flow of fluid within the pipeline. It is typically used when the pipeline needs to be completely shut off for maintenance or emergencies. The blind plate valve 8 provides a highly reliable, low-cost shutoff measure and is not typically used for conventional on / off control, but rather as a safety isolation device.

[0039] The butterfly valve 7 is used for opening and closing during routine operations and is suitable for situations where fluids need to be opened and closed quickly, with good regulation capabilities. It primarily handles daily flow control tasks. The blind plate valve 8 itself cannot be operated frequently, but when complete closure is required, such as during maintenance or emergencies, it provides absolute shutoff capability, ensuring a durable seal and safe isolation. By combining the butterfly valve 7 and the blind plate valve 8, a complete isolation mode can be quickly switched when needed. Even if the butterfly valve 7 fails, the blind plate valve 8 ensures complete isolation of the system. When used together, the blind plate valve 8 provides additional safety during maintenance or emergency situations.

[0040] Regulating valves 9 are used to precisely control the flow, pressure, and temperature of fluids in pipelines. They adjust and control the flow of media by varying the valve opening. This type of valve is particularly important when precise control of system operating parameters is required, offering multiple levels of control options.

[0041] The quick-acting valve 10 is used to quickly open and close pipeline fluids, typically in emergency situations. Its rapid response capability allows it to quickly shut off fluid flow, protecting the system. The quick-acting valve 10 is crucial in emergency response scenarios, ensuring safety and protection in a fraction of the time.

[0042] A ball valve 11 is provided on the ignition nozzle pipe 6; it is convenient to control the gas supply of each ignition nozzle 1 and realize flexible ignition control; the ball valve 11 is suitable for high pressure and high temperature environments, has good sealing performance, and can provide a reliable flow interruption effect when closed, which can effectively prevent gas leakage and improve the safety of production operations.

[0043] A blast furnace gas ignition nozzle front valve 15 is provided at the connection between the blast furnace gas pipeline 4 and each gas pipeline 2; a coke oven gas ignition nozzle front valve 16 is provided at the connection between the coke oven gas pipeline 5 and each gas pipeline 2; the valve redundancy design is used to improve operational safety.

[0044] The air inlet of the gas pipeline 2 is also connected to the air outlet of the purge pipeline 13, and the air inlet of the purge pipeline 13 is connected to the steam supply system or the nitrogen supply system; it is used to cooperate with the vent pipe 12 to ensure that the impurities in the pipeline can be effectively removed before the gas is delivered.

[0045] Specifically, nitrogen is used for purging. Nitrogen's inert properties effectively reduce oxygen concentration in the pipeline, thereby minimizing the risk of fire or explosion. Steam purging helps remove moisture and condensation from the pipeline, preventing corrosion and the thermal efficiency of the gas flow. Furthermore, in the event of an emergency or unplanned shutdown, steam or nitrogen can be quickly injected into the purge pipe 13 to ensure that gas and other flammable gases in the pipeline are quickly and safely removed, preventing any dangerous situations.

[0046] A blast furnace gas ignition nozzle front pipe 20 and a coke oven gas ignition nozzle front pipe 21 are also provided between the gas pipeline 2 and the ignition nozzle pipeline 6; the air inlets of the blast furnace gas ignition nozzle front pipe 20 and the coke oven gas ignition nozzle front pipe 21 are both connected to the air outlet of the gas pipeline 2, and the air outlets of the blast furnace gas ignition nozzle front pipe 20 and the coke oven gas ignition nozzle front pipe 21 are both connected to the air inlet of the ignition nozzle pipeline 6; a blast furnace gas ignition nozzle front valve 15 is provided on the blast furnace gas ignition nozzle front pipe 20, and a coke oven gas ignition nozzle front valve 16 is provided on the coke oven gas ignition nozzle front pipe 21; since the calorific value of blast furnace gas is lower than that of coke oven gas, the amount of blast furnace gas used is greater when the same amount of heat is released by combustion, so the diameter of the blast furnace gas ignition nozzle front pipe 20 is set to be larger than the diameter of the coke oven gas ignition nozzle front pipe 21;

[0047] A combustion-supporting air ignition nozzle front pipe 22 is arranged between the combustion-supporting air pipe 3 and the ignition nozzle pipe 6, the air inlet of the combustion-supporting air ignition nozzle front pipe 22 is connected to the combustion-supporting air pipe 3, and the air outlet of the combustion-supporting air ignition nozzle front pipe 22 is connected to the air inlet of the ignition nozzle pipe 6; a combustion-supporting air ignition nozzle front valve 17 is arranged on the combustion-supporting air ignition nozzle front pipe 22.

[0048] The valve 15 in front of the blast furnace gas ignition nozzle adopts a DN100 gas valve, and the valve 16 in front of the coke oven gas ignition nozzle adopts a DN50 ball valve 11; the valve at the connection between the gas pipeline 2 and the blast furnace gas pipeline 4 adopts a DN450 metal sealed valve, the valve at the connection between the gas pipeline 2 and the coke oven gas pipeline 5 adopts a DN250 metal sealed valve, and the valve at the connection between the combustion-supporting air pipeline 3 and the combustion-supporting air main pipe adopts a DN100 air valve.

[0049] Working principle:

[0050] Ignition operation of double gas ignition furnace:

[0051] S1, confirm that all valves are in the closed state;

[0052] S1, open the quick-cut valve 10 and the regulating valve 9 of the blast furnace gas pipeline 4 and the coke oven gas pipeline 5.

[0053] S2, open the relief valve 18 of the relief pipe 12 on all gas pipelines 2, and introduce steam or nitrogen into the gas inlet of the gas pipeline 2 through the purge pipe 13 to replace the air inside the gas pipeline 2. The purge time is 15 to 30 minutes.

[0054] S3, replacing the steam / nitrogen in gas pipeline 2 with blast furnace gas / coke oven gas;

[0055] Open the blind valve 8 on the blast furnace gas pipeline 4 / coke oven gas pipeline 5, and then slowly open the butterfly valve 7 in front of the blind valve 8; then close the purge pipeline 13, stop the steam or nitrogen purge, and replace the steam or nitrogen with blast furnace gas / coke oven gas. The release time is 15 to 30 minutes.

[0056] It should be noted that the steam / helium purge in the pipeline 13 cannot be stopped before the blind valve 8 and the butterfly valve 7 are opened, so as to avoid the vacuum and the re-inhalation of air; the vent pipe 12 cannot be closed, otherwise the gas pipeline 2 will be vacuumed and collapsed.

[0057] S4, take samples at the outlet of the vent pipe 12 for combustion and explosion test; use a dedicated explosion tube to collect blast furnace gas / coke oven gas at the outlet of the vent pipe 12 on each gas pipeline 2; after the blast furnace gas / coke oven gas is full, ignite the explosion tube and observe whether the gas burns to the bottom. If it burns to the bottom, the gas concentration is qualified, otherwise it is unqualified; if it is qualified, close the vent valve 18 on the vent pipe 12, if it is unqualified,

[0058] S5, aim the igniter, which includes an igniter gun or a torch with an open flame, at the ignition nozzle 1; adjust the opening of the regulating valve 9 of the blast furnace gas pipeline 4 / coke oven gas pipeline 5 to 10%-20%, and adjust the opening of the combustion air regulating valve 199 of the combustion air main pipe to 5%-10%; open the ball valve 11 connected to one ignition nozzle 1, the blast furnace gas ignition nozzle front valve 15 / coke oven gas ignition nozzle front valve 16, and the combustion air ignition nozzle front valve 17 connected to the ignition nozzle 1; observe the ignition status of the ignition nozzle 1: after confirming that the ignition nozzle 1 is ignited, ignite the other ignition nozzles 1 on the same gas pipeline 2 in sequence; then ignite the ignition nozzles 1 on other gas pipelines 2;

[0059] During the above ignition period, if the ignition fails or the flame goes out immediately after being ignited, immediately close the quick-cut valve 10 and the regulating valve 9, check the cause and carefully check the valves on the pipeline; wait until the gas in the furnace is exhausted and confirm that the problem has been eliminated before re-igniting;

[0060] S6: After the burner is ignited, gradually increase the combustion air flow rate and the blast furnace gas / coke oven gas flow rate to make the burner reach the best combustion state. In the best combustion state, the flame color is light blue and there is no obvious flame overflow.

[0061] After ignition, it is necessary to always pay attention to maintaining the open flame state in the furnace, control the coke oven gas pressure in the coke oven gas pipeline 5 to be within the range of 1.5Kpa~10Kpa / the blast furnace gas pressure in the blast furnace gas pipeline 4 to be within the range of 4Kpa~20Kpa, and the air pressure in the combustion air pipeline 3 to be within the range of 3Kpa~7Kpa.

[0062] Fire extinguishing operation of double gas ignition stove:

[0063] S1, close the current gas quick-cut valve 10 and regulating valve 9,

[0064] S2, after the fire of the ignition nozzle 1 is extinguished, close the butterfly valve 7 of the gas main, and then close the blind plate valve 8 of the gas main.

[0065] S3. Open the relief valve 18 of the relief pipe 12 at the end of the gas pipeline 2. Pass steam or nitrogen through the purge pipe 13 at the gas inlet of the gas pipeline 2 to displace the air inside the gas pipeline 2. The purge time is 15 to 30 minutes, until no gas leaks out of the relief pipe 12 at the end of the gas pipeline 2. Check the gas content with a portable alarm to see if there is any gas leak. If the content is 0, there is no gas leak.

[0066] S4: When there is no gas overflow, stop purging, close all valves, and the fire extinguishing operation is completed.

[0067] Valve control method for pure blast furnace gas ignition: Close the valve 16 in front of the three-row coke oven gas ignition nozzle, close the valve at the connection between the first and third-row gas pipelines 2 and the coke oven gas pipeline 5, open all air and blast furnace gas valves in front of the three-row burner, and the specific operation is according to the above-mentioned gas supply ignition operation.

[0068] Valve control for pure coke oven gas ignition: Keep the DN100 gas valve 15 closed before the third-row blast furnace gas ignition nozzles. Close the DN450 metal-sealed valve at the connection between the third-row gas pipe 2 and the blast furnace gas pipe 4. Keep the DN100 air valve 17 open before the second-row combustion air ignition nozzles at 10-20%. Keep the DN100 air valve at the connection between the second-row combustion air pipe 3 and the combustion air main pipe at 10% to prevent high-temperature radiation from the furnace from affecting the burner heads. Open all air and coke oven gas valves before the first and third-row burners. Specific operations are the same as those for gas supply ignition.

[0069] Valve control method for igniting high-coke mixed gas: Since blast furnace gas pressure is typically greater than coke oven gas pressure, pure blast furnace gas is used as the fuel for ignition. After blast furnace gas ignition, coke oven gas is introduced to create a mixed gas. Open the DN250 valve at the connection between coke oven gas pipeline 5 and gas pipeline 2 to 30%-50%. Then, slightly open the DN50 ball valve 11 in front of the coke oven gas ignition nozzle 16 one by one, gradually increasing the opening. Simultaneously, gradually close the DN100 valve 15 in front of the blast furnace gas ignition nozzle. Observe the changes in the furnace flame and maintain a certain degree of rigidity for the burner flame. The capacity of the high-coke mixing burner is designed to have a calorific value of 1200-1800Kcal / NM3. Based on the furnace temperature (controlled between 1050±100℃) and the ignition effect (the sintering material surface is neither over-melted nor under-burned), the high-coke mixing ratio is maintained between (7:3-9:1) through the valves of the blast furnace gas pipeline 4 and the coke oven gas pipeline 5.

[0070] High coke gas switching operation method: After extinguishing the ignition furnace in the current burning state, re-ignite it using another gas as fuel.

[0071] The above description of the present invention is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A dual-gas ignition furnace, comprising a plurality of ignition nozzles (1) arranged in the ignition furnace, M gas pipes (2) and M combustion-supporting air pipes (3) arranged above the ignition furnace, characterized in that: The air inlet of each gas pipeline (2) is also connected to a blast furnace gas pipeline (4) and / or a coke oven gas pipeline (5) for supplying fuel; the air outlet of each gas pipeline (2) is respectively connected to the air inlets of a plurality of ignition nozzles (1) through ignition nozzle pipelines (6); the air inlet of each ignition nozzle pipeline (6) is also connected to a combustion-supporting air pipeline (3) for supplying combustion-supporting air; the air inlet of the combustion-supporting air pipeline (3) is provided with a blower; wherein, The blast furnace gas pipeline (4), the coke oven gas pipeline (5), the combustion air pipeline (3) and the ignition nozzle pipeline (6) are respectively provided with a plurality of valves; M is a natural number not less than 3.

2. A dual gas ignition stove according to claim 1, characterized in that: One or two combustion-supporting air ducts (3) are provided between two adjacent gas pipelines (2).

3. A dual gas ignition stove according to claim 1, characterized in that: The dual-gas ignition furnace comprises N ignition nozzles (1), each gas pipeline (2) is connected to N / M ignition nozzles (1) via N / M ignition nozzle pipelines (6), and both N and N / M are natural numbers not less than 3.

4. A dual gas ignition stove according to claim 1, characterized in that: The blast furnace gas pipeline (4) and the coke oven gas pipeline (5) are respectively provided with a butterfly valve (7), a blind plate valve (8), a regulating valve (9) and a quick-cut valve (10) in sequence from the air inlet to the air outlet.

5. A dual gas ignition stove according to claim 1, characterized in that: A valve is provided at the connection between the blast furnace gas pipeline (4) and each gas pipeline (2); and a valve is provided at the connection between the coke oven gas pipeline (5) and each gas pipeline (2).

6. A dual gas ignition stove according to claim 1, characterized in that: A blast furnace gas ignition nozzle front pipe (20) and a coke oven gas ignition nozzle front pipe (21) are also provided between the gas pipeline (2) and the ignition nozzle pipeline (6); a blast furnace gas ignition nozzle front valve (15) is provided on the blast furnace gas ignition nozzle front pipe (20), and a coke oven gas ignition nozzle front valve (16) is provided on the coke oven gas ignition nozzle front pipe (21); the diameter of the blast furnace gas ignition nozzle front pipe (20) is larger than the diameter of the coke oven gas ignition nozzle front pipe (21); a combustion air ignition nozzle front pipe (22) is provided between the combustion air ignition nozzle pipeline (3) and the ignition nozzle pipeline (6), and a combustion air ignition nozzle front valve (17) is provided on the combustion air ignition nozzle front pipe (22); and a ball valve (11) is provided on the ignition nozzle pipeline (6).

7. A dual gas ignition stove according to claim 1, characterized in that: The upper end of the gas outlet of the gas pipeline (2) is also provided with a relief pipe (12) for removing foreign gas in the pipeline, and a relief valve (18) is provided on the relief pipe (12).

8. A dual gas ignition stove according to claim 7, characterized in that: The air inlet of the gas pipeline (2) is also connected to the air outlet of the purge pipeline (13), and the air inlet of the purge pipeline (13) is connected to a steam supply system or a nitrogen supply system.

9. The dual gas ignition stove according to claim 1, characterized in that: The combustion-supporting air duct (3) is provided with an explosion relief valve (14); the air inlet of the combustion-supporting air duct (3) is connected to the same combustion-supporting air main pipe; a valve is provided at the connection between the combustion-supporting air main pipe and each combustion-supporting air duct (3); a blower is provided at the air inlet of the combustion-supporting air main pipe, and a combustion-supporting air regulating valve (19) is provided on the combustion-supporting air main pipe.

10. The dual gas ignition stove according to claim 1, characterized in that: Among the three gas pipelines (2), all three gas pipelines (2) are connected to the blast furnace gas pipeline (4), and the two gas pipelines (2) located on both sides are connected to the coke oven gas pipeline (5).

Images