A double-channel coal gas ignition and diffusion device and method for a smelting reduction furnace

Abstract

The present application relates to a kind of ignition diffusion device and method of smelting reduction furnace double channel coal gas, belong to metallurgical production equipment and method technical field.The technical scheme is: smelting reduction furnace (1) is connected with bag filter (2) by raw coal gas main pipe (5), the front end of net coal gas main pipe (6) is connected with bag filter (2), the rear end is connected with coal gas pipe network (18), diffusion tower (3) is provided with raw coal gas branch pipe (7) and net coal gas branch pipe (8) before, the front end of raw coal gas branch pipe (7) is connected with raw coal gas main pipe (5), the rear end is connected with diffusion tower (3), the front end of net coal gas branch pipe (8) is connected with net coal gas main pipe (6), the rear end is connected with diffusion tower (3).The beneficial effects of the present application are: according to smelting reduction furnace production demand, use a seat ignition diffusion tower, raw, net coal gas under abnormal or special condition of smelting reduction furnace is ignited and diffused, guarantees smelting reduction ironmaking coal gas system safe operation.

Description

Technical Field

[0001] This invention relates to a dual-channel gas ignition and venting device and method for a molten reduction furnace, belonging to the technical field of metallurgical production equipment and methods. Background Technology

[0002] During the start-up and smelting process of a molten reduction furnace, if certain abnormal or special operating conditions cause the coal gas temperature to be too high or the calorific value of the coal gas to be too low to be recovered and reused, the molten reduction furnace gas needs to be ignited and vented to ensure the safe operation of the molten reduction ironmaking gas system. When the coal gas temperature is too high, the raw molten furnace gas needs to be ignited and vented to protect the safe operation of the dust collector bags. When the coal gas temperature is suitable but the calorific value is too low to be recovered and reused, the gas needs to be purified by a bag filter before ignition and venting to reduce environmental pollution. Therefore, it is necessary to invent gas venting devices adapted to different operating conditions to ensure the safe production of the molten reduction furnace under various conditions. Summary of the Invention

[0003] The purpose of this invention is to provide a dual-channel gas ignition and venting device and method for a molten reduction furnace. By setting up a raw gas branch pipe and a clean gas branch pipe in front of the venting tower, a single ignition and venting tower can be used to ignite and vent the raw and clean gas under abnormal or special operating conditions of the molten reduction furnace according to the production needs of the molten reduction furnace, ensuring the safe operation of the molten reduction ironmaking gas system and effectively solving the above-mentioned problems existing in the background art.

[0004] The technical solution of this invention is: a dual-channel gas ignition and venting device for a molten reduction furnace, comprising a molten reduction furnace, a bag filter, a venting tower, an ignition device, a raw gas main pipe, and a clean gas main pipe. The molten reduction furnace is connected to the bag filter via the raw gas main pipe, with a butterfly valve and a blind valve at the connection point. The front end of the clean gas main pipe is connected to the bag filter, and the rear end is connected to the gas main network, with a butterfly valve and a blind valve at the connection point. A raw gas branch pipe and a clean gas branch pipe are provided in front of the venting tower. The front end of the raw gas branch pipe is connected to the raw gas main pipe, and the rear end is connected to the venting tower, with a butterfly valve and a blind valve in the middle. The front end of the clean gas branch pipe is connected to the clean gas main pipe, and the rear end is connected to the venting tower, with a butterfly valve and a blind valve in the middle. The ignition device is located at the top of the venting tower.

[0005] It also includes a regulating valve, which is installed on the clean gas branch pipe. When the clean gas is ignited and released, the opening degree of the regulating valve is matched with the furnace pressure inside the molten reduction furnace.

[0006] The raw coal gas branch pipe at the connection of the venting tower is installed above the clean coal gas branch pipe.

[0007] The upper temperature limit of the bag filter is 280℃.

[0008] A method for igniting and releasing gas in a dual-channel molten reduction furnace includes the following steps: (1) During normal production, the gas from the molten reduction furnace enters the bag filter through the raw gas main pipe. After being purified by the bag filter, the gas enters the clean gas main pipe and then the gas main pipe network. (2) When the coal temperature is too high and exceeds the upper limit of the bag filter temperature, open the valve on the raw coal gas branch pipe to ignite and release the raw coal gas of the molten reduction furnace. (3) When the gas temperature is suitable but the calorific value is too low to be recycled, the gas needs to be purified by a bag filter before ignition and release. Open the valve on the clean gas branch pipe to ignite and release the clean gas from the molten reduction furnace.

[0009] Step (2) includes the following steps: starting the ignition device, opening the blind valve one and butterfly valve one on the raw coal gas branch pipe in sequence, and closing the butterfly valve two and blind valve two on the raw coal gas main pipe in sequence to realize the ignition and release of raw coal gas in the molten reduction furnace.

[0010] In step (2), the upper limit of the temperature of the bag filter (2) is 280°C.

[0011] The step (3) includes the following steps: starting the ignition device, opening the regulating valve, blind valve three and butterfly valve three on the clean gas branch pipe in sequence, and closing the butterfly valve four and blind valve four on the clean gas main pipe in sequence to realize the ignition and release of clean gas in the molten reduction furnace.

[0012] In step (3), the furnace pressure of the molten reduction furnace is adjusted by adjusting the opening of the regulating valve.

[0013] The beneficial effects of this invention are: by setting raw coal gas branch pipes and clean coal gas branch pipes in front of the venting tower, a single ignition venting tower can be used to ignite and vent the raw and clean coal gas under abnormal or special operating conditions of the molten reduction furnace according to the production needs of the molten reduction furnace, thereby ensuring the safe operation of the molten reduction ironmaking gas system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the workflow of the present invention; In the diagram: 1. Melting reduction furnace; 2. Bag filter; 3. Venting tower; 4. Ignition device; 5. Raw coal gas main pipe; 6. Clean coal gas main pipe; 7. Raw coal gas branch pipe; 8. Clean coal gas branch pipe; 9. Butterfly valve 1; 10. Blind valve 2; 11. Blind valve 2; 12. Butterfly valve 3; 13. Blind valve 3; 14. Regulating valve; 15. Butterfly valve 4; 16. Blind valve 4; 17. Coal gas main network; 18. Detailed Implementation

[0015] To make the purpose, technical solutions, and advantages of the invention's embodiments clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only a small part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0016] A dual-channel gas ignition and venting device for a molten reduction furnace includes a molten reduction furnace 1, a bag filter 2, a venting tower 3, an ignition device 4, a raw gas main pipe 5, and a clean gas main pipe 6. The molten reduction furnace 1 is connected to the bag filter 2 via the raw gas main pipe 5, with a butterfly valve 11 and a blind valve 12 at the connection point. The front end of the clean gas main pipe 6 is connected to the bag filter 2, and the rear end is connected to the gas main network 18, with a butterfly valve 16 and a blind valve 17 at the connection point. A raw gas branch pipe 7 and a clean gas branch pipe 8 are provided in front of the venting tower 3. The front end of the raw gas branch pipe 7 is connected to the raw gas main pipe 5, and the rear end is connected to the venting tower 3, with a butterfly valve 9 and a blind valve 10 in the middle. The front end of the clean gas branch pipe 8 is connected to the clean gas main pipe 6, and the rear end is connected to the venting tower 3, with a butterfly valve 13 and a blind valve 14 in the middle. The ignition device 4 is located at the top of the venting tower 3.

[0017] It also includes a regulating valve 15, which is installed on the clean gas branch pipe 8, and the opening degree of the regulating valve 15 is matched with the furnace pressure of the molten reduction furnace 1.

[0018] The raw coal gas branch pipe 7 at the connection of the venting tower 3 is installed on the upper part of the clean coal gas branch pipe 8.

[0019] The upper temperature limit of the bag filter 2 is 280℃.

[0020] A method for igniting and releasing gas in a dual-channel molten reduction furnace includes the following steps: (1) During normal production, the gas from the molten reduction furnace enters the bag filter through the raw gas main pipe. After being purified by the bag filter, the gas enters the clean gas main pipe and then the gas main pipe network. (2) When the coal temperature is too high and exceeds the upper limit of the bag filter temperature, open the valve on the raw coal gas branch pipe to ignite and release the raw coal gas of the molten reduction furnace. (3) When the gas temperature is suitable but the calorific value is too low to be recycled, the gas needs to be purified by a bag filter before ignition and release. Open the valve on the clean gas branch pipe to ignite and release the clean gas from the molten reduction furnace.

[0021] Step (2) includes the following steps: starting the ignition device, opening the blind valve one and butterfly valve one on the raw coal gas branch pipe in sequence, and closing the butterfly valve two and blind valve two on the raw coal gas main pipe in sequence to realize the ignition and release of raw coal gas in the molten reduction furnace.

[0022] In step (2), the upper limit of the temperature of the bag filter (2) is 280°C.

[0023] The step (3) includes the following steps: starting the ignition device, opening the regulating valve, blind valve three and butterfly valve three on the clean gas branch pipe in sequence, and closing the butterfly valve four and blind valve four on the clean gas main pipe in sequence to realize the ignition and release of clean gas in the molten reduction furnace.

[0024] In step (3), the furnace pressure of the molten reduction furnace is adjusted by adjusting the opening of the regulating valve. Example 1

[0025] A dual-channel gas ignition and venting device for a molten reduction furnace is disclosed. During normal production, the molten reduction furnace gas enters the bag filter 2 through the raw gas main pipe 5. After purification by the bag filter 2, the gas enters the clean gas main pipe 6, and then enters the main gas network. Due to the special operating conditions of the molten reduction furnace, the gas temperature is too high, exceeding the 280°C temperature requirement of the bag filter. When this occurs, the raw gas venting system needs to be activated to ignite and vent the raw gas from the molten reduction furnace.

[0026] Activate ignition device 4 to ensure that the carbon monoxide contained in the raw coal gas is ignited and completely burned when it is released.

[0027] Open blind valve 10, then open butterfly valve 9.

[0028] After closing butterfly valve 211, blind valve 22 is closed to ignite and release the raw gas from the molten reduction furnace. Example 2

[0029] A dual-channel gas ignition and venting device for a molten reduction furnace is disclosed. During normal production, the molten reduction furnace gas enters the bag filter 2 through the raw gas main pipe 5. After purification by the bag filter 2, the gas enters the clean gas main pipe 6, and then enters the gas main network 18. Due to the special operating conditions of the molten reduction furnace, when the gas temperature is suitable but the calorific value is too low to be recovered and reused, the gas needs to be purified by the bag filter 2 before ignition and venting. Therefore, the clean gas ignition and venting system needs to be activated to ignite and vent the clean gas from the molten reduction furnace.

[0030] Activate ignition device 4 to ensure that the carbon monoxide contained in the clean gas is ignited and completely burned when it is released.

[0031] Open regulating valve 15, open blind valve 3 14, and then open butterfly valve 3 13.

[0032] Close butterfly valve 4.16, then close blind valve 4.17 to ignite and release the raw gas from the molten reduction furnace.

[0033] The pressure inside the molten reduction furnace can be adjusted via regulating valve 15 to ensure safe production of the molten reduction furnace.

[0034] This invention is applied to the ignition and venting of gas from a molten reduction furnace. Addressing different gas conditions and operating requirements of the molten reduction furnace, and to ensure the safe operation of the molten reduction ironmaking gas system, it enables the venting of both raw and clean gas from the molten reduction furnace. A single ignition and venting tower is used to achieve both raw and clean gas venting modes.

Claims

1. A method for igniting and releasing gas in a dual-channel molten reduction furnace, characterized in that: The ignition and venting system used includes a molten reduction furnace (1), a bag filter (2), a venting tower (3), an ignition device (4), a raw coal gas main pipe (5), and a clean coal gas main pipe (6). The molten reduction furnace (1) is connected to the bag filter (2) through the raw coal gas main pipe (5), and a butterfly valve (11) and a blind valve (12) are provided at the connection. The front end of the clean coal gas main pipe (6) is connected to the bag filter (2), and the rear end is connected to the coal gas main network (18), and a butterfly valve (16) and a blind valve (17) are provided at the connection. A raw coal gas branch pipe (7) and a clean coal gas branch pipe (8) are provided in front of the venting tower (3). The front end of the raw coal gas branch pipe (7) is connected to the raw coal gas main pipe (5), and the rear end is connected to the clean coal gas main network (8). The venting tower (3) is connected, with butterfly valve 1 (9) and blind valve 1 (10) in the middle; the front end of the clean gas branch pipe (8) is connected to the clean gas main pipe (6), and the rear end is connected to the venting tower (3), with butterfly valve 3 (13) and blind valve 3 (14) in the middle; the ignition device (4) is set at the top of the venting tower (3); the ignition venting device also includes a regulating valve (15), which is set on the clean gas branch pipe (8), and the opening degree of the regulating valve (15) matches the furnace pressure of the molten reduction furnace (1); at the connection of the venting tower (3), the raw gas branch pipe (7) is installed on the upper part of the clean gas branch pipe (8); the upper limit of the temperature of the bag filter (2) is 280℃; The ignition and venting method includes the following steps: (1) During normal production, the gas from the molten reduction furnace enters the bag filter through the raw gas main pipe. After being purified by the bag filter, the gas enters the clean gas main pipe and then the gas main pipe network. (2) When the coal temperature is too high and exceeds the upper limit of the bag filter temperature, open the valve on the raw coal gas branch pipe to ignite and release the raw coal gas of the molten reduction furnace. (3) When the gas temperature is suitable but the calorific value is too low to be recycled, the gas needs to be purified by a bag filter before ignition and release. Open the valve on the clean gas branch pipe to ignite and release the clean gas from the molten reduction furnace.

2. The method for ignition and venting of gas in a dual-channel molten reduction furnace according to claim 1, characterized in that: Step (2) includes the following steps: starting the ignition device, opening the blind valve one and butterfly valve one on the raw coal gas branch pipe in sequence, and closing the butterfly valve two and blind valve two on the raw coal gas main pipe in sequence to realize the ignition and release of raw coal gas in the molten reduction furnace.

3. The method for ignition and venting of gas in a dual-channel molten reduction furnace according to claim 1, characterized in that: The step (3) includes the following steps: starting the ignition device, opening the regulating valve, blind valve three and butterfly valve three on the clean gas branch pipe in sequence, and closing the butterfly valve four and blind valve four on the clean gas main pipe in sequence to realize the ignition and release of clean gas in the molten reduction furnace.

4. The method for ignition and venting of gas in a dual-channel molten reduction furnace according to claim 1, characterized in that: In step (3), the furnace pressure of the molten reduction furnace is adjusted by adjusting the opening of the regulating valve.

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