Sintering oxygen-enriched ignition automatic temperature control device and method

Abstract

The present invention relates to the technical field of sintering operation in steel plants, and in particular to a sintering oxygen-enriched ignition automatic temperature control device and method thereof, comprising an ignition furnace, a sintering machine being provided at the bottom of the ignition furnace, a combustion-supporting air duct and a gas duct being connected at the top of the ignition furnace, an oxygen duct being connected to the combustion-supporting air duct, two nitrogen purge hoses being connected to the oxygen duct, and valves for controlling gas being connected to the combustion-supporting air duct, the gas duct, the nitrogen purge hose, and the oxygen duct. The present invention adjusts the combustion-supporting air flow rate so that the air-fuel ratio reaches an optimal value, ensures that the gas is fully burned, and maximizes the gas economy. During the sintering process, the present invention automatically responds to the loss of unstable quality of the sintered products caused by unstable gas calorific value and large fluctuations in gas pressure, thereby improving the product quality qualification rate, reducing manual operations, and saving manpower. The present invention is also more convenient, safe, and reliable, and is suitable for widespread promotion.

Description

Technical Field

[0001] The present invention relates to the technical field of sintering operation in steel plants, and in particular to a sintering oxygen-enriched ignition automatic temperature control device and method thereof. Background Art

[0002] Oxygen-enriched sintering involves mixing a certain proportion of oxygen into the combustion-supporting air to ensure more complete combustion of the fuel and a more thorough sintering reaction. During the sintering process, the high temperatures and combustion products generated by the combustion of solid fuels such as coke or anthracite provide the necessary heat and atmosphere for the formation of the liquid phase and the conduct of all physical and chemical reactions. Relatively high oxygen levels improve heat and mass transfer in the gas, solid, and liquid phases, facilitating the formation of the liquid phase. This not only facilitates more complete reactions but also improves the combustion of the coke, resulting in the full oxidation of low-valent iron oxides and the necessary conditions for the formation of calcium ferrite. Therefore, oxygen-enriched sintering improves sinter quality, both in terms of uniform particle size distribution and optimized chemical composition. Automatic control of sintering ignition temperature has long been a challenge for steelmakers. Controlling the sintering ignition temperature is not only essential for ensuring sinter quality but, in the context of energy conservation and emission reduction, can significantly reduce gas consumption during the sintering process and reduce pollutant emissions caused by incomplete combustion. In existing solutions, an oxygen pipeline is connected to the combustion air pipeline, and a manual valve is installed on the oxygen pipeline. This valve is manually opened and closed to achieve oxygen enrichment in the combustion air. Manually adjusting the valve opening prevents accurate positioning, resulting in uncertain oxygen flow and an inability to ensure stable oxygen content in the combustion air. On-site ignition workers manually adjust the gas regulating valve based on the ignition furnace temperature and observed ignition intensity. Large fluctuations in gas pressure and unstable calorific value require frequent adjustments to the gas regulating valve. Manual adjustments can result in inappropriate and untimely adjustments, leading to unstable ignition temperature and intensity, impacting sintering production and wasting gas. Some systems utilize the PID function in PLC programming to automatically adjust the regulating valve and ignition temperature, but this method results in excessively frequent adjustments, significantly reducing the service life of the regulating valve. The combustion air regulating valve is typically set to a fixed opening. Adjusting the gas regulating valve alone to change the air-fuel ratio prevents sintering production from maintaining the optimal air-fuel ratio. Summary of the Invention

[0003] The present invention proposes an automatic temperature control device for sintering oxygen-enriched ignition, which stabilizes the oxygen content in the combustion-supporting air by automatically controlling the oxygen flow rate, adjusts the gas flow rate according to the ignition temperature to stabilize the sintering ignition temperature within the temperature range required for normal production, and adjusts the combustion-supporting air flow rate to achieve the optimal air-fuel ratio, ensuring sufficient combustion of the gas and maximizing gas economy, thereby achieving the purpose of ensuring the sintering production ignition temperature and intensity while achieving the most economical gas usage, thus solving the above-mentioned problems.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a sintering oxygen-enriched ignition automatic temperature control device, comprising an ignition furnace, a sintering machine is arranged at the bottom of the ignition furnace, a combustion-supporting air duct and a gas duct are connected to the top of the ignition furnace, the combustion-supporting air duct is connected to an oxygen duct, the oxygen duct is connected to two nitrogen purge hoses, and the combustion-supporting air duct, gas duct, nitrogen purge hose and oxygen duct are all connected to valves for controlling gas.

[0005] Preferably, the gas pipeline is connected in sequence with a gas temperature transmitter, a gas start-up quick-cut valve, a gas regulating valve, a gas pressure transmitter and a gas flow meter in a direction away from the ignition furnace.

[0006] Preferably, the combustion-supporting air duct is connected in sequence with a combustion-supporting air temperature transmitter, a combustion-supporting air start-up quick-cut valve, a combustion-supporting air regulating valve, a combustion-supporting air pressure transmitter and a combustion-supporting air gas flow meter in the direction away from the ignition furnace, and the end of the combustion-supporting air duct is connected to two combustion-supporting fans.

[0007] Preferably, the oxygen pipeline is connected with a first oxygen manual valve, an oxygen regulating valve, an oxygen temperature transmitter, a first oxygen pressure transmitter, an oxygen start-up quick-cut valve, a one-way valve, a self-operated pressure-stabilizing valve, a second oxygen pressure transmitter, an oxygen gas flow meter, a filter and a second oxygen manual valve in sequence in the direction away from the ignition furnace, and a vent manual valve is connected between the one-way valve and the self-operated pressure-stabilizing valve.

[0008] Preferably, the two-way nitrogen purge hose includes a first nitrogen purge hose connected between the first oxygen manual valve and the oxygen regulating valve and a second nitrogen purge hose connected between the filter and the second oxygen manual valve, the first nitrogen purge hose is connected to a first nitrogen inlet manual valve, and the second nitrogen purge hose is connected to a second nitrogen inlet manual valve.

[0009] Preferably, the following parameter settings are included:

[0010] P-L is the minimum pressure of the control gas source;

[0011] Pair-H is the maximum pressure of the control gas source;

[0012] P oxygen -1 is the minimum value of oxygen pipeline pressure;

[0013] FO2-initial is the initial opening of the oxygen regulating valve;

[0014] F Oxygen-adjustment is the manual adjustment range of the oxygen regulating valve;

[0015] F assist-adjustment is the maximum adjustment of combustion air;

[0016] T stop is the downtime for maintenance;

[0017] Tstop-L is the minimum downtime;

[0018] T interval is the combustion air adjustment interval time.

[0019] Preferably, the oxygen startup process includes:

[0020] 1) Slowly open the first oxygen manual valve and the second oxygen manual valve to prepare for startup. Observe that the oxygen pressure should be greater than P oxygen -1, proving that oxygen has been delivered to the on-site pipeline;

[0021] 2) After the sintering machine is in normal and stable production, use the manual mode to open the oxygen start quick-cut valve and set the oxygen regulating valve opening to F oxygen-initial. After the oxygen analyzer data stabilizes, gradually increase the oxygen regulating valve opening until the oxygen content in the combustion air stabilizes at the preset value.

[0022] 3) When the oxygen content in the combustion air reaches the preset value, switch to manual mode. After the switch is completed, the oxygen concentration can be set to the desired value. In automatic mode, the system automatically adjusts the oxygen regulating valve to maintain the oxygen concentration of the combustion air within the range of ±0.3% of the set value;

[0023] 4) In both manual and automatic modes, the combustion air volume should be slowly reduced. The single reduction of the combustion air volume should not exceed F assist-adjustment. After adjusting the combustion air volume once, it must be adjusted again after an interval of more than T interval.

[0024] The oxygen temporary shutdown process includes:

[0025] 1) If the downtime is less than or equal to Tstop-L, and the sintering machine is in production and the combustion air in the combustion air duct is flowing normally, close the oxygen regulating valve and the oxygen start-up quick-cut valve. It is not necessary to close the oxygen outlet manual valve and the oxygen inlet manual valve to prepare for the next start-up.

[0026] 2) The shutdown time is between T stop - L and T stop, and the sintering machine is in production state, and the combustion air in the combustion air duct flows normally. In this case, first close the oxygen regulating valve and the oxygen start quick cut valve, and then go to the site to close the oxygen outlet manual valve and the oxygen inlet manual valve;

[0027] 3) If the downtime is less than or equal to Tstop, but the sintering machine is producing abnormally or has stopped production, and there is no air flow in the combustion air duct, in this case, first close the oxygen regulating valve and the oxygen start-up quick-cut valve, then go to the site to close the oxygen outlet manual valve and the oxygen inlet manual valve, and then perform nitrogen replacement according to the process to purge the oxygen in the pipeline to the outside, then close the oxygen regulating valve and the oxygen start-up quick-cut valve, keep the oxygen outlet manual valve and the oxygen inlet manual valve closed, and prepare for the next start-up;

[0028] The oxygen long-term shutdown process includes:

[0029] 1) Close the oxygen regulating valve, oxygen start-up quick-cut valve, oxygen outlet manual valve and oxygen inlet manual valve;

[0030] 2) First slowly open the manual valve for releasing oxygen, then open the oxygen regulating valve and the oxygen start-up quick-cut valve. At this time, the oxygen in the pipeline will automatically release into the outdoor air due to pressure.

[0031] 3) Connect the nitrogen purge hose to the oxygen pipeline, open the first nitrogen inlet manual valve and the second nitrogen inlet manual valve in sequence, and use nitrogen to purge the residual oxygen in the oxygen pipeline to the outside;

[0032] 4) Close the manual valve of the nitrogen purge hose outlet, open the manual valve of the oxygen outlet, blow the residual oxygen in the terminal pipe into the combustion air pipe, close the manual valve of the oxygen outlet, and prepare to remove the nitrogen purge hose;

[0033] 5) Procedure for removing the nitrogen purge hose: Close the nitrogen main gas source manual valve, ensure that the first nitrogen inlet manual valve, the second nitrogen inlet manual valve, the vent manual valve, the oxygen regulating valve, and the oxygen start-up quick-cut valve are in the open state, and then observe the pressure gauge on the oxygen pipeline. If the pressure gauge value is lower than 0.01 MPa, the nitrogen purge hose can be removed with confidence. After removing the nitrogen purge hose, close the first nitrogen inlet manual valve, the second nitrogen inlet manual valve, the vent manual valve, the oxygen regulating valve, and the oxygen start-up quick-cut valve;

[0034] 6) If welding is required on the oxygen pipeline, the pipeline to be welded must be physically and electrically isolated from the oxygen source pipeline before welding can be carried out, and the shutdown process is completed;

[0035] The ignition furnace startup process is as follows: start the machine in manual mode, set the opening of the ignition furnace gas regulating valve, and after the machine is stable, click the mode switch to change the manual mode to the automatic mode, and then set the ignition furnace temperature setting value. The automatic regulating valve will adjust the gas flow change to achieve a stable ignition temperature of the ignition furnace.

[0036] The shutdown process of the ignition furnace is as follows: set the ignition furnace operation mode to manual mode, manually set the opening of the ignition furnace regulating valve to 0, and the shutdown process of other equipment shall be carried out according to the original sintering machine shutdown procedures.

[0037] The beneficial effects of the present invention are:

[0038] A sintering machine is provided at the bottom of the ignition furnace, and a combustion-supporting air duct and a gas duct are connected to the top of the ignition furnace. The combustion-supporting air duct is connected to an oxygen duct, and the oxygen duct is connected to two nitrogen purge hoses. The combustion-supporting air duct, the gas duct, the nitrogen purge hose and the oxygen duct are all connected to valves for controlling the gas. The oxygen flow rate is automatically controlled to stabilize the oxygen content in the combustion-supporting air, and the gas flow rate is adjusted by the ignition temperature to stabilize the sintering ignition temperature within the normal production temperature range. The combustion-supporting air flow rate is adjusted to achieve the optimal air-fuel ratio, ensuring that the gas is fully burned and maximizing the gas economy, thereby achieving the purpose of ensuring the sintering production ignition temperature and intensity while achieving the most economical gas usage. In the sintering process, the system automatically responds to the loss of unstable product quality caused by unstable gas calorific value and large fluctuations in gas pressure, which not only improves the product quality qualification rate, reduces manual operations, saves manpower, but also is more convenient, safe and reliable, and suitable for wide promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of the present invention.

[0040] In the figure: 1- ignition furnace, 2- sintering machine, 3- gas temperature transmitter, 4- gas start quick cut valve, 5- gas regulating valve, 6- gas pressure transmitter, 7- gas flow meter, 8- oxygen outlet manual valve, 9- one-way valve, 10- self-operated pressure regulating valve, 11- filter, 12- nitrogen purge hose, 13- combustion air duct, 14- combustion air fan, 15- gas pipeline, 16- oxygen pipeline, 17- combustion air temperature transmitter, 18- Combustion-supporting air starting quick-cut valve, 19-combustion-supporting air regulating valve, 20-combustion-supporting air pressure transmitter, 21-combustion-supporting air gas flow meter, 22-oxygen regulating valve, 23-oxygen temperature transmitter, 24-first oxygen pressure transmitter, 25-oxygen starting quick-cut valve, 26-second oxygen pressure transmitter, 27-oxygen gas flow meter, 28-oxygen inlet manual valve, 29-first nitrogen inlet manual valve, 30-second nitrogen inlet manual valve, 31-release port manual valve. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Reference Figure 1 A sintering oxygen-enriched ignition automatic temperature control device includes an ignition furnace 1, a sintering machine 2 is arranged at the bottom of the ignition furnace 1, a combustion-supporting air duct 13 and a gas pipeline 15 are connected to the top of the ignition furnace 1, the combustion-supporting air duct 13 is connected to an oxygen pipeline 16, and the oxygen pipeline 16 is connected to two nitrogen purge hoses 12. The combustion-supporting air duct 13, the gas pipeline 15, the nitrogen purge hose 12 and the oxygen pipeline 16 are all connected with valves for controlling gas.

[0043] The gas pipeline 15 is connected in sequence with a gas temperature transmitter 3, a gas start-up quick-cut valve 4, a gas regulating valve 5, a gas pressure transmitter 6 and a gas flow meter 7 in a direction away from the ignition furnace 1.

[0044] The combustion-supporting air duct 13 is connected in sequence with a combustion-supporting air temperature transmitter 17, a combustion-supporting air start-up quick-cut valve 18, a combustion-supporting air regulating valve 19, a combustion-supporting air pressure transmitter 20 and a combustion-supporting air gas flow meter 21 in the direction away from the ignition furnace 1, and the end of the combustion-supporting air duct 13 is connected to two combustion-supporting fans 14.

[0045] The oxygen pipeline 16 is connected in sequence with the first oxygen manual valve 8, the oxygen regulating valve 22, the oxygen temperature transmitter 23, the first oxygen pressure transmitter 24, the oxygen start-up quick-cut valve 25, the one-way valve 9, the self-operated pressure-stabilizing valve 10, the second oxygen pressure transmitter 26, the oxygen gas flowmeter 27, the filter 11 and the second oxygen manual valve 28 in the direction away from the ignition furnace 1. A vent manual valve 31 is connected between the one-way valve 9 and the self-operated pressure-stabilizing valve 10.

[0046] The two-way nitrogen purge hose 12 includes a first nitrogen purge hose connected between the first oxygen manual valve 8 and the oxygen regulating valve 22, and a second nitrogen purge hose connected between the filter 11 and the second oxygen manual valve 28. The first nitrogen purge hose is connected to a first nitrogen inlet manual valve 29, and the second nitrogen purge hose is connected to a second nitrogen inlet manual valve 30.

[0047] The method of using the sintering oxygen-enriched ignition automatic temperature control device includes the following parameter settings:

[0048] P-L is the minimum pressure of the control gas source;

[0049] Pair-H is the maximum pressure of the control gas source;

[0050] P oxygen -1 is the minimum value of oxygen pipeline pressure;

[0051] FO2-initial is the initial opening of the oxygen regulating valve;

[0052] F Oxygen-adjustment is the manual adjustment range of the oxygen regulating valve;

[0053] F assist-adjustment is the maximum adjustment of combustion air;

[0054] T stop is the downtime for maintenance;

[0055] Tstop-L is the minimum downtime;

[0056] T interval is the combustion air adjustment interval time.

[0057] The usage of the sintering oxygen-enriched ignition automatic temperature control device is as follows:

[0058] The following items need to be checked before starting the oxygen machine:

[0059] ① The oxygen inlet manual valve 28, oxygen regulating valve 22, oxygen start-up quick-cut valve 25, first nitrogen inlet manual valve 29, second nitrogen inlet manual valve 30, and relief valve 31 are closed. The oxygen outlet manual valve 8 is open. The nitrogen purge hose 12 has been removed from the pipeline.

[0060] ② The oxygen start-up quick-cut valve 25 and the oxygen regulating valve 22 control the gas source normally, and the pointer pressure gauge shows that the control gas source pressure is between Pair-L and Pair-H.

[0061] ③ “Oxygen safety interlock is in use” is displayed on the operating computer in the central control room.

[0062] The oxygen startup process includes:

[0063] 1. Slowly open the first oxygen manual valve 8 and the second oxygen manual valve 28 to prepare for startup. Observe that the oxygen pressure should be greater than P oxygen - 1, indicating that oxygen has been delivered to the on-site pipeline;

[0064] 2. After the sintering machine 2 is in normal and stable production, use manual mode to open the oxygen start quick-cut valve 25 and set the opening of the oxygen regulating valve 22 to Foxygen-initial. After the oxygen analyzer data stabilizes, gradually increase the opening of the oxygen regulating valve 22 (single valve position adjustment to Foxygen-adjust) until the oxygen content in the combustion air stabilizes at the preset value;

[0065] 3. After the oxygen content in the combustion air reaches the preset value, switch to manual mode. After the switch is completed, the oxygen concentration can be set to the desired value. In automatic mode, the system automatically adjusts the oxygen regulating valve 22 to maintain the oxygen concentration of the combustion air within the range of ±0.3% of the set value;

[0066] 4. In both manual and automatic modes, the combustion air volume should be slowly reduced. The single reduction of the combustion air volume should not exceed F assist-adjust. After adjusting the combustion air volume once, an interval of more than T interval must be left before adjusting the combustion air volume again. That is, if the combustion air volume needs to be reduced by 2*F assist-adjust, the operation needs to be performed twice, with an interval of more than one minute between the two operations.

[0067] The oxygen temporary shutdown process includes:

[0068] Temporary shutdown includes the following three situations

[0069] ① The combustion air volume is reduced too quickly, and operational errors cause the oxygen content to exceed the safe value, resulting in rapid cutting of the oxygen pipeline.

[0070] ② The interlocking condition is met, resulting in automatic quick disconnection of the oxygen pipeline.

[0071] ③ In the case of changing the trolley, the oxygen regulating valve 22 and the oxygen starting quick-cut valve 25 on the oxygen pipeline are manually closed.

[0072] The above-mentioned types of oxygen pipeline shutdowns are characterized by short downtime (less than T hours), and the oxygen pipeline will be put back into use immediately after the problem is resolved.

[0073] 1. If the downtime is less than or equal to Tstop-L, and the sintering machine 2 is in production and the combustion air in the combustion air duct 13 is flowing normally, close the oxygen regulating valve 22 and the oxygen start-up quick-cut valve 25. It is not necessary to close the oxygen outlet manual valve 8 and the oxygen inlet manual valve 28 to prepare for the next start-up.

[0074] 2. The shutdown time is between Tstop-L and Tstop, and the sintering machine 2 is in production, and the combustion air in the combustion air duct 13 is flowing normally. In this case, first close the oxygen regulating valve 22 and the oxygen start-up quick-cut valve 25, and then go to the site to close the oxygen outlet manual valve 8 and the oxygen inlet manual valve 28;

[0075] 3. If the downtime is less than or equal to Tstop, but the sintering machine 2 is producing abnormally or has stopped production, and there is no air flowing in the combustion-supporting air duct 13, first close the oxygen regulating valve 22 and the oxygen starting quick-cut valve 25, then go to the site to close the oxygen outlet manual valve 8 and the oxygen inlet manual valve 28, and then perform nitrogen replacement according to the process to purge the oxygen in the pipeline to the outside, then close the oxygen regulating valve 22 and the oxygen starting quick-cut valve 25, and keep the oxygen outlet manual valve 8 and the oxygen inlet manual valve 28 closed to prepare for the next start-up;

[0076] The oxygen long-term shutdown process includes:

[0077] Long-term downtime includes the following situations.

[0078] ① Sintering machine 2 is shut down for maintenance, and the maintenance time is greater than 2*Tstop.

[0079] ②Sintering machine 2 is operating normally, but the equipment on the oxygen pipeline needs maintenance or replacement.

[0080] ③ Sintering machine 2 is producing normally, but it is manually decided that the oxygen enrichment function is not needed under the current working conditions, so the use of the oxygen pipeline is stopped.

[0081] 1. Close the oxygen regulating valve 22, the oxygen start-up quick-cut valve 25, the oxygen outlet manual valve 8, and the oxygen inlet manual valve 28;

[0082] 2. First slowly open the manual valve for releasing oxygen, then open the oxygen regulating valve 22 and the oxygen start quick cut valve 25. At this time, the oxygen in the pipeline will automatically release into the outdoor air due to pressure.

[0083] 3. Connect the nitrogen purge hose 12 to the oxygen pipeline 16, open the first nitrogen inlet manual valve 29 and the second nitrogen inlet manual valve 30 in sequence, and use nitrogen to purge the residual oxygen in the oxygen pipeline 16 to the outside;

[0084] 4. Close the manual valve at the discharge port of the nitrogen purge hose 12, open the manual valve 8 at the oxygen outlet, blow the residual oxygen in the terminal pipe into the combustion-supporting air pipe 13, close the manual valve 8 at the oxygen outlet, and prepare to remove the nitrogen purge hose 12;

[0085] 5. Procedure for removing the nitrogen purge hose 12: Close the nitrogen main gas source manual valve, ensure that the first nitrogen inlet manual valve 29, the second nitrogen inlet manual valve 30, the vent manual valve, the oxygen regulating valve 22, and the oxygen start quick-cut valve 25 are open, and then observe the pressure gauge on the oxygen pipeline. If the pressure gauge reading is less than 0.01 MPa, you can safely remove the nitrogen purge hose 12. After removing the nitrogen purge hose 12, close the first nitrogen inlet manual valve 29, the second nitrogen inlet manual valve 30, the vent manual valve, the oxygen regulating valve 22, and the oxygen start quick-cut valve 25. Be careful not to remove the nitrogen hose under pressure! Failure to do so may result in personal injury.

[0086] 6. If welding is required on the oxygen pipeline 16, the pipeline to be welded must be physically and electrically isolated from the oxygen source pipeline before welding can be performed, and the shutdown process ends;

[0087] The startup process of ignition furnace 1 is as follows: start the machine in manual mode, set the opening of the gas regulating valve of ignition furnace 1, and after the machine is started and the production is stable, click the mode switch to change the manual mode to the automatic mode, and then set the temperature setting value of ignition furnace 1. The automatic regulating valve adjusts the gas flow change to achieve a stable ignition temperature of ignition furnace 1;

[0088] The shutdown process of ignition furnace 1 is as follows: set the operation mode of ignition furnace 1 to manual mode, manually set the opening of ignition furnace 1 regulating valve to 0, and the shutdown process of other equipment shall be executed according to the original shutdown procedures of sintering machine 2.

[0089] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A sintering oxygen-enriched ignition automatic temperature control device, comprising an ignition furnace (1), a sintering machine (2) being provided at the bottom of the ignition furnace (1), and a combustion-supporting air duct (13) and a gas duct (15) being connected at the top of the ignition furnace (1), characterized in that: The combustion-supporting air duct (13) is connected to an oxygen duct (16), and the oxygen duct (16) is connected to two nitrogen purge hoses (12). The combustion-supporting air duct (13), the gas duct (15), the nitrogen purge hose (12), and the oxygen duct (16) are all connected to valves for controlling gas. The gas pipeline (15) is connected in sequence to a gas temperature transmitter (3), a gas start-up quick-cut valve (4), a gas regulating valve (5), a gas pressure transmitter (6), and a gas flow meter (7) in a direction away from the ignition furnace (1); The combustion-supporting air duct (13) is connected in sequence to a combustion-supporting air temperature transmitter (17), a combustion-supporting air start-up quick-cut valve (18), a combustion-supporting air regulating valve (19), a combustion-supporting air pressure transmitter (20) and a combustion-supporting air gas flow meter (21) in a direction away from the ignition furnace (1), and the end of the combustion-supporting air duct (13) is connected to two combustion-supporting fans (14); The oxygen pipeline (16) is connected in sequence with a first oxygen manual valve (8), an oxygen regulating valve (22), an oxygen temperature transmitter (23), a first oxygen pressure transmitter (24), an oxygen start-up quick-cut valve (25), a one-way valve (9), a self-operated pressure-stabilizing valve (10), a second oxygen pressure transmitter (26), an oxygen gas flow meter (27), a filter (11) and a second oxygen manual valve (28) in a direction away from the ignition furnace (1). A discharge port manual valve (31) is connected between the one-way valve (9) and the self-operated pressure-stabilizing valve (10); The two-way nitrogen purge hose (12) comprises a first nitrogen purge hose connected between the first oxygen manual valve (8) and the oxygen regulating valve (22), and a second nitrogen purge hose connected between the filter (11) and the second oxygen manual valve (28), wherein the first nitrogen purge hose is connected to a first nitrogen inlet manual valve (29), and the second nitrogen purge hose is connected to a second nitrogen inlet manual valve (30).

2. The method for using the sintering oxygen-enriched ignition automatic temperature control device according to claim 1, characterized in that: Including the following parameter settings, P-L is the minimum pressure of the control gas source; Pair-H is the maximum pressure of the control gas source; P oxygen -1 is the minimum value of oxygen pipeline pressure; FO2-initial is the initial opening of the oxygen regulating valve; F Oxygen-adjustment is the manual adjustment range of the oxygen regulating valve; F assist-adjustment is the maximum adjustment of combustion air; T stop is the downtime for maintenance; Tstop-L is the minimum downtime; T interval is the combustion air adjustment interval time.

3. The method for using the sintering oxygen-enriched ignition automatic temperature control device according to claim 2, characterized in that: The oxygen startup process includes: 1) Slowly open the first oxygen manual valve (8) and the second oxygen manual valve (28) to prepare for startup. Observe that the oxygen pressure should be greater than P oxygen - 1, indicating that oxygen has been delivered to the on-site pipeline; 2) After the sintering machine (2) is in normal and stable production, use the manual mode to open the oxygen start quick cut valve (25), set the opening of the oxygen regulating valve (22) to F oxygen - initial, and after the data of the oxygen analyzer is stable, gradually increase the opening of the oxygen regulating valve (22) until the oxygen content in the combustion air is stable at the preset value; 3) After the oxygen content in the combustion air reaches the preset value, the system switches to manual mode. After the switch is completed, the oxygen concentration can be set to the desired value. In automatic mode, the system automatically adjusts the oxygen regulating valve (22) to maintain the oxygen concentration of the combustion air within the range of ±0.3% of the set value; 4) In both manual and automatic modes, the combustion air volume should be slowly reduced. The single reduction of the combustion air volume should not exceed F assist-adjustment. After adjusting the combustion air volume once, it must be adjusted again after an interval of more than T interval. The oxygen temporary shutdown process includes: 1) The downtime is ≤ Tstop-L, and the sintering machine (2) is in production state, and the combustion air in the combustion air duct (13) flows normally. In this case, the oxygen regulating valve (22) and the oxygen start-up quick-cut valve (25) are closed, and there is no need to close the oxygen outlet manual valve (8) and the oxygen inlet manual valve (28) to prepare for the next start-up; 2) The shutdown time is between T stop - L and T stop, and the sintering machine (2) is in production state, and the combustion air in the combustion air duct (13) flows normally. In this case, first close the oxygen regulating valve (22) and the oxygen start quick cut valve (25), and then go to the site to close the oxygen outlet manual valve (8) and the oxygen inlet manual valve (28); 3) If the downtime is less than or equal to Tstop, but the sintering machine (2) is producing abnormally or stops producing, and there is no air flow in the combustion air duct (13), in this case, first close the oxygen regulating valve (22) and the oxygen start-up quick-cut valve (25), then go to the site to close the oxygen outlet manual valve (8) and the oxygen inlet manual valve (28), and then perform nitrogen replacement according to the process to blow the oxygen in the pipeline to the outside, and then close the oxygen regulating valve (22) and the oxygen start-up quick-cut valve (25), keep the oxygen outlet manual valve (8) and the oxygen inlet manual valve (28) closed, and prepare for the next start-up; The oxygen long-term shutdown process includes: 1) Close the oxygen regulating valve (22), the oxygen start-up quick-cut valve (25), the oxygen outlet manual valve (8) and the oxygen inlet manual valve (28); 2) First, slowly open the manual valve (31) to release the oxygen, then open the oxygen regulating valve (22) and the oxygen start-up quick-cut valve (25). At this time, the oxygen in the pipeline will automatically be released into the outdoor air due to pressure; 3) Connect the nitrogen purge hose (12) to the oxygen pipeline (16), open the first nitrogen inlet manual valve (29) and the second nitrogen inlet manual valve (30) in sequence, and use nitrogen to purge the residual oxygen in the oxygen pipeline (16) to the outside; 4) Close the manual valve (31) at the outlet of the nitrogen purge hose (12), open the manual valve (8) at the oxygen outlet, blow the residual oxygen in the terminal pipe into the combustion air pipe (13), close the manual valve (8) at the oxygen outlet, and prepare to remove the nitrogen purge hose (12); 5) Remove the nitrogen purge hose (12) process: Close the nitrogen main gas source manual valve, ensure that the first nitrogen inlet manual valve (29), the second nitrogen inlet manual valve (30), the vent manual valve (31), the oxygen regulating valve (22), and the oxygen start-up quick-cut valve (25) are in the open state, and then observe the pressure gauge on the oxygen pipeline. If the pressure gauge value is lower than 0.01 MPa, the nitrogen purge hose (12) can be removed at this time. After removing the nitrogen purge hose (12), close the first nitrogen inlet manual valve (29), the second nitrogen inlet manual valve (30), the vent manual valve (31), the oxygen regulating valve (22), and the oxygen start-up quick-cut valve (25); 6) If welding is required on the oxygen pipeline (16), the pipeline to be welded must be physically and electrically isolated from the oxygen source pipeline before welding can be performed. The shutdown process is completed; The process of starting up the ignition furnace (1) is as follows: start up in manual mode, set the opening of the gas regulating valve of the ignition furnace (1), and after the production is stable after startup, click the mode switch to change the manual mode to the automatic mode, and then set the temperature setting value of the ignition furnace (1), and adjust the gas flow rate of the automatic regulating valve to achieve a stable ignition temperature of the ignition furnace (1); The shutdown process of the ignition furnace (1) is as follows: the operation mode of the ignition furnace (1) is set to manual mode, the opening of the ignition furnace (1) regulating valve is manually set to 0, and the shutdown process of other equipment is executed according to the original shutdown procedures of the sintering machine (2).

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