Blast furnace gas diffusion ignition device and operation method thereof

Abstract

The invention relates to a blast furnace gas diffusion ignition device and an operation method thereof, and belongs to the technical field of metallurgical equipment and methods. According to the technical scheme, an ignition rod (1) and a combustion-supporting gas pipe (2) are arranged side by side, the combustion-supporting gas pipe (2) is communicated with a diffusion tower pipeline (4), a windproof cover (3) wraps the outer sides of the upper portions of the ignition rod (1) and the combustion-supporting gas pipe (2), the ignition rod (1), the combustion-supporting gas pipe (2) and the windproof cover (3) form a main body structure, and the main body structure is connected with the diffusion tower pipeline in a welded mode and inclines towards the center of the diffusion tower pipeline by 10-15 degrees. The combustion-supporting gas pipe is communicated with the diffusion tower pipeline, diffused coal gas is directly used as a combustion-supporting gas source, spare parts and combustion-supporting gas are effectively saved, impact on flames is reduced after the pressure of the combustion-supporting gas source is reduced through the combustion-supporting gas pipe, the combustion condition of the combustion-supporting gas is effectively stabilized, meanwhile, a coping mode under extreme or unforeseen circumstances is set, and the service life of the combustion-supporting gas is prolonged. The ignition device has the advantages of sensitive ignition, continuous and stable combustion and combustion-supporting gas saving.

Description

Technical Field

[0001] The present invention relates to a blast furnace gas relief ignition device and its operation method, belonging to the technical field of metallurgical equipment and methods. Background Art

[0002] The calorific value of blast furnace gas is lower than that of converter gas and coke oven gas. Its main component is N2, with a content of about 50%, and the main combustible component is CO, with a content of about 22%. The flame is not easy to burn continuously.

[0003] Common electrode ignition devices are easily affected by the harsh combustion conditions and weather conditions at the top of the relief tower, resulting in a decrease in sensitivity or even failure. When gas relief is required, problems such as flameout and flashback occur, causing the CO in the plant area to exceed the standard, polluting the environment, endangering the safety of the surrounding population, and triggering environmental protection accidents.

[0004] Moreover, traditional ignition devices use high-calorific value gas as the auxiliary gas source, resulting in a large amount of gas loss.

[0005] Therefore, a new type of blast furnace gas relief tower ignition device and operation method are needed, which can not only solve the problem of ignition device failure but also solve the problem of waste of auxiliary gas resources. Summary of the Invention

[0006] The object of the present invention is to provide a blast furnace gas relief ignition device and its operation method. By connecting the auxiliary combustion gas pipe with the relief tower pipe, directly using the relief gas as the auxiliary gas source, it effectively saves spare parts and auxiliary gas. And the auxiliary gas source is decompressed through the auxiliary combustion gas pipe, reducing the impact on the flame, which can effectively stabilize the combustion of the auxiliary gas. At the same time, a response mode for extreme or accidental situations is set, having the advantages of sensitive ignition, continuous stable combustion, and saving auxiliary gas, effectively solving the above problems existing in the background art.

[0007] The technical solution of the present invention is: a blast furnace gas relief ignition device, including an ignition rod, an auxiliary combustion gas pipe, and a windproof cover. The ignition rod and the auxiliary combustion gas pipe are connected in parallel by welding, the auxiliary combustion gas pipe is connected to the relief tower pipe, the windproof cover is wrapped around the upper outer sides of the ignition rod and the auxiliary combustion gas pipe. The ignition rod, the auxiliary combustion gas pipe, and the windproof cover form a main structure, and the main structure is welded to the relief tower pipe and inclined 10 - 15 degrees towards the center of the relief tower pipe. The number of the main structures is at least two, and they are evenly arranged around the relief tower pipe.

[0008] The top of the overall structure is 15 - 30 cm higher than the relief tower, and the top of the ignition rod is 10 - 20 cm higher than the auxiliary combustion gas pipe.

[0009] The ignition rod includes an ignition element, which is sintered and formed by wrapping tungsten wire with silicon nitride ceramics. The ignition element is fixed in the ignition element slot, and the ignition element is connected to the power supply wire through a wiring base.

[0010] The combustion-supporting gas pipe includes a first pipe fitting, a first pipe fitting branch, a second pipe fitting, and a third pipe fitting. The first pipe fitting, the second pipe fitting, and the third pipe fitting are connected in sequence from bottom to top along the gas flow direction. The first pipe fitting branch is connected to the first pipe fitting and extends into the inside of the bleeder stack pipe. A first pipe fitting branch bell mouth is installed at the end of the first pipe fitting branch that penetrates deep into the bleeder stack pipe.

[0011] The two ends of the second pipe fitting have different diameters, and its diameter gradually increases along the gas flow direction until it is the same as that of the third pipe fitting.

[0012] One side of the wind shield facing the bleeder stack pipe is lower than the side facing away from the bleeder stack pipe, and it is welded to the bleeder stack pipe through a first connecting piece and a second connecting piece.

[0013] A method for operating a blast furnace gas bleeder ignition device includes the following steps: (1) The ignition rod, the combustion-supporting gas pipe, and the wind shield form a main structure. The main structure is welded to the bleeder stack pipe, and the combustion-supporting gas pipe is communicated with the bleeder stack pipe; (2) When the main blast furnace gas pipeline reaches the bleeder pressure, the power supply line in the ignition rod is energized, and the ignition element heats the silicon nitride ceramic through the tungsten wire; (3) When the discharged blast furnace gas flows through the bleeder stack pipe, it enters the combustion-supporting gas pipe, is introduced into the first pipe fitting after throttling through the first pipe fitting branch bell mouth, is decompressed and decelerated through the second pipe fitting, and then is ignited by the ignition rod at the third pipe fitting. After the combustion-supporting gas in the combustion-supporting gas pipe is ignited, it ignites the large-flow blast furnace gas in the bleeder stack pipe; (4) In extreme or accidental situations, when the blast furnace gas bleeder cannot burn stably and there are problems such as flameout and flashback, high-calorific value gas is introduced into the first pipe fitting and ignited by the ignition rod to be used as an accompanying combustion and stable gas source.

[0014] In the step (1), the main structure inclines 10 - 15 degrees towards the center of the bleeder stack pipe, and the number of the main structures is at least two, which are evenly arranged around the bleeder stack pipe.

[0015] In the step (2), the ignition rod includes an ignition element. The ignition element is sintered and pressed into shape by wrapping tungsten wire with silicon nitride ceramic. The ignition element is fixed in the ignition element slot, and the ignition element is connected to the power supply line through a wiring base.

[0016] In the step (3), in the combustion-supporting gas pipe, the first pipe fitting, the second pipe fitting, and the third pipe fitting are connected in sequence from bottom to top along the gas flow direction. The first pipe fitting branch is connected to the first pipe fitting and extends into the inside of the bleeder stack pipe. A first pipe fitting branch bell mouth is installed at the end of the first pipe fitting branch that penetrates deep into the bleeder stack pipe; the diameter of the second pipe fitting gradually increases along the gas flow direction until it is the same as that of the third pipe fitting.

[0017] The beneficial effects of the present invention are as follows: the combustion-supporting gas pipe is connected to the venting tower pipeline, and the venting coal gas is directly used as the combustion-supporting gas source, which effectively saves spare parts and combustion-supporting gas, and the combustion-supporting gas source reduces the impact on the flame after the pressure is reduced through the combustion-supporting gas pipe, which can effectively stabilize the combustion of the combustion-supporting gas. At the same time, a response mode for extreme or unexpected situations is set, which has the advantages of sensitive ignition, continuous stable combustion and saving combustion-supporting gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the ignition rod of the present invention; Figure 2 It is a structural schematic diagram of the combustion-supporting gas pipe of the present invention; Figure 3 It is a schematic diagram of the overall structure of the present invention; In the figure: ignition rod 1, threading tube 11, ignition element slot 12, ignition element 13, tungsten wire 131, silicon nitride ceramic 132, wiring base 14, power cord 15, combustion-supporting pipe 2, first pipe fitting 21, first pipe fitting branch 22, first pipe fitting branch bell mouth 221, second pipe fitting 23, third pipe fitting 24, wind shield 3, connector three 31, connector four 32, connector five 33, connector six 34, connector seven 35, connector eight 36, connector one 37, connector two 38, discharge tower pipeline 4. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions in the implementation cases of the present invention will be clearly and completely described below in conjunction with the drawings in the implementation cases. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] A blast furnace gas dispersing ignition device comprises an ignition rod 1, a combustion-supporting pipe 2 and a wind shield 3. The ignition rod 1 and the combustion-supporting pipe 2 are arranged in parallel by welding connection. The combustion-supporting pipe 2 is connected to a dispersing tower pipe 4. The wind shield 3 is wrapped and arranged on the upper outer side of the ignition rod 1 and the combustion-supporting pipe 2. The ignition rod 1, the combustion-supporting pipe 2 and the wind shield 3 constitute a main structure. The main structure is welded to the dispersing tower pipe 4 and inclined 10-15 degrees to the center of the dispersing tower pipe 4. There are at least two main structures, which are evenly arranged around the dispersing tower pipe 4.

[0021] The top of the overall structure is 15-30 cm higher than the emission tower, and the top of the ignition rod 1 is 210-20 cm higher than the combustion-supporting pipe.

[0022] The ignition rod includes an ignition element 13, which is formed by sintering and pressing a tungsten wire 131 wrapped with silicon nitride ceramic 132. The ignition element 13 is fixed in an ignition element slot 12, and the ignition element 13 is connected to a power line 15 through a wiring base 14.

[0023] The combustion-supporting gas pipe 2 includes a first pipe fitting 21, a first pipe fitting branch 22, a second pipe fitting 23, and a third pipe fitting 24. The first pipe fitting 21, the second pipe fitting 23, and the third pipe fitting 24 are connected in sequence from bottom to top along the gas flow direction. The first pipe fitting branch 22 is connected to the first pipe fitting 21 and extends into the inside of the flare tower pipe 4. A first pipe fitting branch bell mouth 221 is installed at the end of the first pipe fitting branch 22 that penetrates deep into the flare tower pipe 4.

[0024] The two ends of the second pipe fitting 23 have different diameters, and its diameter gradually increases along the gas flow direction until it is the same as that of the third pipe fitting 24.

[0025] One side of the wind shield 3 facing the flare tower pipe 4 is lower than the side facing away from the flare tower pipe 4, and it is welded to the flare tower pipe 4 through a first connector 37 and a second connector 38.

[0026] An operation method of a blast furnace gas flare ignition device includes the following steps: (1) The ignition rod, the combustion-supporting gas pipe, and the wind shield form a main structure. The main structure is welded to the flare tower pipe, and the combustion-supporting gas pipe is communicated with the flare tower pipe; (2) When the blast furnace gas main pipeline reaches the flare pressure, the power line in the ignition rod is energized, and the ignition element heats the silicon nitride ceramic through the tungsten wire; (3) When the flared blast furnace gas flows through the flare tower pipe, it enters the combustion-supporting gas pipe. After being throttled by the first pipe fitting branch bell mouth, it is introduced into the first pipe fitting. After being decompressed and decelerated by the second pipe fitting, it reaches the third pipe fitting and is ignited by the ignition rod. After the combustion-supporting gas in the combustion-supporting gas pipe is ignited, the large-flow blast furnace gas in the flare tower pipe is ignited; (4) In extreme or accidental situations, when the blast furnace gas flare cannot burn stably and there are problems of flameout and extinction, high-calorific value gas is introduced into the first pipe fitting and ignited by the ignition rod to be used as an accompanying combustion and stable gas source.

[0027] In the step (1), the main structure inclines 10-15 degrees towards the center of the flare tower pipe. The number of main structures is at least two and they are evenly arranged around the flare tower pipe.

[0028] In the step (2), the ignition rod includes an ignition element, which is formed by sintering and pressing a tungsten wire wrapped with silicon nitride ceramic. The ignition element is fixed in an ignition element slot, and the ignition element is connected to a power line through a wiring base.

[0029] In the step (3), in the combustion-supporting gas pipe, the first pipe fitting, the second pipe fitting and the third pipe fitting are connected in sequence from bottom to top along the gas flow direction. The first pipe fitting branch is connected to the first pipe fitting and extends into the inside of the gas-discharge tower pipe. The end of the first pipe fitting branch that penetrates into the gas-discharge tower pipe is equipped with a flare of the first pipe fitting branch. The diameter of the second pipe fitting gradually increases along the gas flow direction until it is the same as that of the third pipe fitting.

[0030] In practical applications, when the blast furnace gas main pipe network reaches the gas-discharge pressure, the power line 15 in the ignition rod 1 is energized, and the ignition element 12 heats the silicon nitride ceramic 132 through the tungsten wire 131. The ignition element formed by sintering and pressing the tungsten wire and the silicon nitride ceramic has high hardness, fast heating, strong durability, long service life, and strong adaptability to harsh combustion conditions, and can effectively solve the environmental protection problem of excessive CO in the plant area when the blast furnace gas-discharge tower has problems such as flameout and flashback during gas discharge. Through on-site tests, when the blast furnace gas is lower than 600 kCal / m³, this burner can still continuously ignite the blast furnace gas discharge of 18.6×104 m³ / h. The first batch of ignition devices has been continuously used for 2 years and still maintains stable performance.

[0031] When the discharged blast furnace gas flows through the gas-discharge tower pipe 4, it is throttled by the flare 221 of the first pipe fitting branch and then introduced into the first pipe fitting 21. After being decompressed and decelerated by the second pipe fitting 23, it reaches the third pipe fitting 24 and is ignited by the ignition rod 1. The combustion-supporting gas in the combustion-supporting gas pipe 2 is ignited and then ignites the large-flow blast furnace gas in the gas-discharge tower pipe 4. The end of the first pipe fitting branch that penetrates into the gas-discharge tower pipe is equipped with a flare of the first pipe fitting branch, which can throttle part of the discharged blast furnace gas for combustion support. The two ends of the second pipe fitting have different diameters, and the diameter gradually increases along the gas flow direction until it is the same as that of the third pipe fitting. Through the gradually changing diameter, the flow rate and pressure of the combustion-supporting gas can be effectively reduced, the impact on the combustion-supporting flame can be reduced, and the continuous and stable combustion of the combustion-supporting gas can be realized.

[0032] One side of the wind shield 3 facing the gas-discharge tower pipe is lower than the side facing away from the gas-discharge tower pipe, and it is welded to the gas-discharge tower pipe through a connecting piece, effectively reducing the influence of weather factors at the gas-discharge tower pipe.

[0033] In extreme or accidental situations, when the blast furnace gas discharge cannot burn stably and problems such as flashback and flameout occur, high-calorific-value gases such as coke oven gas and converter gas can be introduced into the first pipe fitting 21, decompressed and decelerated by the second pipe fitting 23, and then reach the third pipe fitting 24 and be ignited by the ignition rod 1 to be used as an accompanying and stabilizing gas source.

[0034] Directly using the discharged gas as the combustion-supporting gas source can effectively save spare parts and combustion-supporting gas. And the combustion-supporting gas source is decompressed through the combustion-supporting gas pipe, reducing the impact on the flame, and can effectively stabilize the combustion of the combustion-supporting gas.

[0035] A response mode for extreme or unexpected situations is set, that is, high-calorific value gases such as coke oven gas and converter gas are introduced into the first pipe fitting and ignited by the ignition rod to be used as the accompanying combustion and stable gas source.

[0036] In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A blast furnace gas relief ignition device, characterized in that: It includes an ignition rod (1), a combustion-supporting gas pipe (2) and a windproof cover (3). The ignition rod (1) and the combustion-supporting gas pipe (2) are arranged side by side and connected by welding. The combustion-supporting gas pipe (2) is communicated with the bleeder stack pipe (4). The windproof cover (3) is wrapped around the outer sides of the upper parts of the ignition rod (1) and the combustion-supporting gas pipe (2). The ignition rod (1), the combustion-supporting gas pipe (2) and the windproof cover (3) form a main structure. The main structure is welded to the bleeder stack pipe (4) and is inclined 10 - 15 degrees towards the center of the bleeder stack pipe (4). The number of the main structures is at least two and they are evenly arranged around the bleeder stack pipe (4).

2. The blast furnace gas blow-off ignition device according to claim 1, characterized in that: The top of the overall structure is 15 - 30 cm higher than the bleeder stack, and the top of the ignition rod (1) is 10 - 20 cm higher than the combustion-supporting gas pipe (2).

3. The blast furnace gas blow-off ignition device according to claim 1, wherein: The ignition rod includes an ignition element (13). The ignition element (13) is formed by sintering and pressing tungsten wire (131) wrapped by silicon nitride ceramic (132). The ignition element (13) is fixed in the ignition element slot (12), and the ignition element (13) is connected to a power line (15) through a wiring base (14).

4. A blast furnace gas relief ignition device according to claim 1, characterized in that: The combustion-supporting gas pipe (2) includes a first pipe fitting (21), a first pipe fitting branch (22), a second pipe fitting (23) and a third pipe fitting (24). The first pipe fitting (21), the second pipe fitting (23) and the third pipe fitting (24) are connected in sequence from bottom to top along the gas flow direction. The first pipe fitting branch (22) is communicated with the first pipe fitting (21) and extends into the bleeder stack pipe (4). A first pipe fitting branch bell mouth (221) is installed at the end of the first pipe fitting branch (22) that extends deep into the bleeder stack pipe (4).

5. The blast furnace gas blow-off ignition device according to claim 4, characterized in that: The two ends of the second pipe fitting (23) have different diameters, and its diameter gradually becomes larger along the gas flow direction until it is the same as that of the third pipe fitting (24).

6. The blast furnace gas blow-off ignition device according to claim 1, wherein: One side of the windproof cover (3) facing the bleeder stack pipe (4) is lower than the side opposite to the bleeder stack pipe (4), and it is welded to the bleeder stack pipe (4) through a connecting piece one (37) and a connecting piece two (38).

7. A method for operating a blast furnace gas blow-off ignition device, characterized in that It includes the following steps: The ignition rod, the combustion-supporting gas pipe and the windproof cover form a main structure. The main structure is welded to the bleeder stack pipe, and the combustion-supporting gas pipe is communicated with the bleeder stack pipe; When the main network of blast furnace gas reaches the bleeding pressure, the power line in the ignition rod is energized, and the ignition element heats the silicon nitride ceramic through the tungsten wire; (3) When the bleeding blast furnace gas flows through the bleeder stack pipe, it enters the combustion-supporting gas pipe, is throttled by the first pipe fitting branch bell mouth and then introduced into the first pipe fitting. After being decompressed and decelerated by the second pipe fitting, it reaches the third pipe fitting and is ignited by the ignition rod. After the combustion-supporting gas in the combustion-supporting gas pipe is ignited, it ignites the large-flow blast furnace gas in the bleeder stack pipe; (4) In extreme or accidental situations, when the blast furnace gas bleeding cannot burn stably and there are problems such as flameout and blowout, the high-calorific value gas is introduced into the first pipe fitting and is ignited by the ignition rod to be used as an accompanying combustion and stable gas source.

8. A method for operating a blast furnace gas blow-off ignition device according to claim 7, characterized in that: In the step (1), the main structure is inclined 10 - 15 degrees towards the center of the bleeder stack pipe. The number of the main structures is at least two and they are evenly arranged around the bleeder stack pipe.

9. A method for operating a blast furnace gas dispersion ignition device according to claim 7, characterized in that: In the step (2), the ignition rod includes an ignition element, which is formed by sintering and pressing tungsten wire wrapped by silicon nitride ceramics. The ignition element is fixed in the ignition element slot, and the ignition element is connected to the power line through a wiring base.

10. A method for operating a blast furnace gas relief ignition device according to claim 7, characterized in that: In the step (3), in the combustion-supporting gas pipe, the first pipe fitting, the second pipe fitting, and the third pipe fitting are connected in sequence from bottom to top along the gas flow direction. The first pipe fitting branch is connected to the first pipe fitting and extends into the internal part of the flare tower pipe. The end of the first pipe fitting branch that penetrates into the flare tower pipe is equipped with a first pipe fitting branch bell mouth; the diameter of the second pipe fitting gradually increases along the gas flow direction until it is the same as that of the third pipe fitting.

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