Furnace top ignition device of blast furnace

Abstract

The invention relates to a blast furnace top ignition device which comprises a platform arranged above a furnace top, an ignition gun is connected to the platform in a swinging mode through two rockers hung below the platform in parallel, the two rockers, the platform and the ignition gun form a parallel four-rod mechanism, and a fuel gas pipeline and a combustion-supporting gas pipeline are hard metal pipes. The igniter is connected to the tail end of the gas pipeline and the tail end of the combustion-supporting gas pipeline, and combustible gas and combustion-supporting gas are received to be mixed and combusted in the igniter. And a push rod for driving the rocker to swing is arranged on the platform. The push rod is adopted to drive the four-connecting-rod mechanism for transmission, the driving mechanism is small in size and light in weight, and equipment is simple; the four-bar mechanism is simple in structure, reliable in transmission and convenient to install and maintain; therefore, the defects that an existing ignition device is complex in transmission device, large in size, heavy and inconvenient to install and maintain are effectively overcome. The gas stove is simple in overall structure, easy and safe to operate, good in combustion effect, not prone to flameout and the like.

Description

Technical Field

[0001] The invention relates to a furnace top gas ignition device used for blast furnace maintenance, in particular to a light suspended four-link blast furnace top ignition device. Background Art

[0002] The blast furnace needs to release the top gas due to failure or planned maintenance, and the residual gas in the furnace needs to be ignited and burned out to avoid gas poisoning accidents when workers enter the furnace to work. Therefore, ignition of the top gas of the blast furnace is an important safety measure. Since manual ignition does not use a constant fire source, there are problems such as local small explosions, flame spraying, easy extinguishing of the fire source, and difficulty in burning out the gas in the furnace, and the ignition process is very dangerous. Therefore, configuring a top ignition device is an important measure for blast furnace safety production. At present. Most of the existing top ignition devices of blast furnaces are trolley-type ignition guns, which use a reduction motor to drive a sprocket or gear to enable the ignition gun to complete the movement of advancing and retreating the gun. The transmission device of this trolley-type ignition device is relatively complex, large in size, heavy in equipment, and inconvenient to install and maintain. Therefore, the inventor, relying on many years of experience and practice in related industries, proposes a blast furnace top ignition device to overcome the defects of the prior art. Summary of the invention

[0003] The purpose of the blast furnace top ignition device of the present invention is to provide a blast furnace top ignition device with simple structure, easy installation and maintenance, light and reliable; the purpose of the blast furnace top ignition device of the present invention is achieved in this way, a blast furnace top ignition device, the ignition device includes a platform arranged above the furnace top, an ignition gun is swingably connected to the platform through two rockers suspended in parallel below the platform, and a parallel four-bar mechanism is formed by the two rockers, the platform and the ignition gun; an electro-hydraulic push rod for driving the rocker to swing is arranged on the platform.

[0004] In a preferred embodiment of a blast furnace top ignition device of the present invention, the electro-hydraulic push rod is controlled by a limit switch arranged on the platform.

[0005] In a preferred embodiment of a blast furnace top ignition device of the present invention, a support is provided on the platform, and the upper ends of the two rockers are pivotally connected to the support.

[0006] In a preferred embodiment of a blast furnace top ignition device of the present invention, the ignition gun is a sleeve-type structure consisting of inner and outer tubes, the inner tube is fixed in the outer tube, a gas transmission channel with a circular cross-section is formed between the inner and outer tubes, and the front end of the outer tube constitutes the gun head.

[0007] In a preferred embodiment of a blast furnace top ignition device of the present invention, a connecting block is fixedly provided on the tube wall at the rear of the outer tube, two pivot joints are spaced apart on the connecting block, and the bottom ends of the two parallel rockers are respectively pivotally connected to the two pivot joints.

[0008] In a preferred embodiment of a blast furnace top ignition device of the present invention, a plurality of side holes are circumferentially provided on the side wall of the lance head.

[0009] In a preferred embodiment of a blast furnace top ignition device of the present invention, the tail of the outer tube is fixedly connected to a first hose for conveying oxygen-enriched air by a quick connector; the tail of the inner tube is fixedly connected to a second hose for conveying fuel gas by a quick connector.

[0010] In a preferred embodiment of a blast furnace top ignition device of the present invention, two air inlet valves are provided on the first hose.

[0011] As described above, a blast furnace top ignition device of the present invention adopts an electro-hydraulic push rod to drive a four-bar linkage for transmission. The driving mechanism is small in size, light in weight, and simple in equipment. The four-bar linkage has a simple structure, reliable transmission, and is convenient for installation and maintenance. Therefore, it effectively overcomes the defects of the existing ignition equipment, such as complex transmission devices, large size, heavy equipment, and inconvenient installation and maintenance.

[0012] The accompanying drawings are only intended to schematically illustrate and explain a blast furnace top ignition device of the present invention, and do not limit the scope of the present invention. Figure 1 It is a structural schematic diagram of a blast furnace top ignition device of the present invention. Figure 2 It is a schematic diagram of the blast furnace top ignition device of the present invention in the ignition position and the non-ignition position.

[0013] The beneficial effects of the present invention are: Due to the small size, light weight and simple equipment of the driving mechanism, the support and platform can be reduced accordingly, and the total weight of the equipment is only 1 / 10 of the traditional ignition device; This ignition device adopts hydraulic push rod and four-bar linkage transmission, which is more reliable than the traditional reduction motor transmission, simple equipment and small maintenance; The ignition gun body is designed as a sleeve-type spray gun structure, and the gun head is a constricted mixing chamber structure with a small spray hole, which is conducive to forming an anti-blowout structure, expanding the ignition area, and shortening the ignition wind-off time; BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the structural diagram of the furnace top musket body; Figure 2 This is the overall view of the small inspection hole on the furnace roof (the position where the gun body is inserted); Figure 3This is the front appearance of the small inspection hole on the furnace roof (opening operation position); 1. Mixed gas igniter; 2. Mixed gas sleeve; 3. Gas pipe bracket; 4. Horizontal axis slot; 5. Rotatable horizontal axis; 6. Gun body platform; 7. Combustion-supporting gas pipeline; 8. Combustible gas pipeline; 9. Combustible gas adjustable valve; 10. Combustible gas adjustable valve; 11. Combustible and combustion-supporting gas source box; 12. Gas source stable base; 13. Platform triangular stable bracket; (Note: Figure 1 2. Mixed gas casing with explosion-proof holes). DETAILED DESCRIPTION

[0015] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described.

[0016] like Figure 1 , Figure 2 As shown, the present invention proposes a blast furnace top ignition device, which includes a platform arranged above the furnace top, an ignition gun is swingably connected to the platform through two rockers suspended in parallel below the platform, and the two rockers, the platform and the ignition gun together form a parallel four-bar mechanism (i.e., a double rocker mechanism); an electro-hydraulic push rod for driving the rocker to swing is arranged on the platform.

[0017] like Figure 2 As shown, the ignition device is in the non-ignition position; the ignition gun of the ignition device is in the ignition position after being inserted into the furnace door. When the ignition device is in use, firstly, the tip of the ignition gun is ignited outside the blast furnace, adjusted to a suitable flame, and then the motor of the electro-hydraulic push rod is started to drive the rocker 3 to swing, and drive the ignition gun to gradually approach the furnace door. When the ignition gun is inserted into the furnace door and is in the ignition position, the electro-hydraulic push rod stops, so that the ignition gun remains stationary in the ignition position, and the gas in the furnace is ignited and burned. Through industrial television monitoring in the blast furnace or manual observation, when the gas in the furnace is completely burned, the motor of the electro-hydraulic push rod is started to reverse, the ignition gun is withdrawn from the furnace, and stopped in the parking position. At this time, the gas source is cut off to extinguish the flame of the ignition gun, and the whole action is completed.

[0018] As described above, the blast furnace top ignition device of the present invention adopts an electro-hydraulic push rod to drive a four-bar linkage for transmission. The driving mechanism is small in size, light in weight, and simple in equipment. The four-bar linkage has a simple structure, reliable transmission, and is convenient for installation and maintenance. Therefore, it effectively overcomes the defects of the existing ignition equipment, such as complex transmission devices, large size, heavy equipment, and inconvenient installation and maintenance.

[0019] like Figure 1As shown, in this embodiment, a support is fixed on the platform, and the upper ends of the two rockers are pivotally connected to the support. In this embodiment, the design of the specific structure such as the size and swing angle of the four-bar mechanism needs to be carefully calculated according to the relevant structures of the blast furnace body and the platform, as well as the specific conditions such as the installation distance between the platform and the furnace body, so that the ignition gun will not interfere with the furnace door during movement. The electro-hydraulic push rod is controlled by a limit switch set on the platform; the limit switch ensures that the ignition gun is in a suitable position by controlling the motor of the electro-hydraulic push rod. When the ignition gun is extended into the furnace, the limit switch sends an in-place signal to stop the electro-hydraulic push rod automatically, and the ignition gun is in the ignition position; when the ignition gun exits the furnace door and swings to the non-ignition position, the limit switch sends an in-place signal to stop the electro-hydraulic push rod, and the ignition gun 2 stops in the parking position.

[0020] In this embodiment, the ignition gun is a sleeve-type structure consisting of an inner tube and an outer tube. The inner tube is fixed in the outer tube, and a gas delivery channel with a circular cross section is formed between the inner and outer tubes. The front end of the outer tube constitutes the gun head. A connecting block is fixedly provided on the tube wall at the rear of the outer tube. Two pivoting parts are arranged at intervals on the connecting block, and the bottom ends of the two parallel rockers are respectively pivoted on the two pivoting parts. The tail of the outer tube is fixedly connected to a first hose for conveying oxygen-enriched air (compressed air and / or oxygen) by a quick connector. The first hose is provided with two air inlet valves, which are respectively connected to the compressed air and oxygen pipelines; the tail of the inner tube is fixedly connected to a second hose for conveying fuel gas by a quick connector; such a structural design can reduce one gas supply hose and avoid damage caused by multiple hoses connected to moving parts; a valve for controlling the opening is provided on the hose, which is used to open and close the gas source or adjust the flame size.

[0021] In this embodiment, a plurality of side holes are provided in the circumferential direction of the side wall of the gun head; the fuel gas and oxygen-enriched air enter the inner and outer tubes through the quick connector at the rear of the ignition gun, respectively, and are transported to the gun head part, where they are mixed and burned; part of the gas emerges from the plurality of side holes at the gun head and burns, which is used to increase the combustion area at the gun head, speed up the ignition process, and has an anti-blowout function.

[0022] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A blast furnace top ignition device, characterized in that The ignition device comprises a platform arranged above the furnace top, an ignition gun is swingably connected to the platform via two rockers suspended in parallel below the platform, and a parallel four-bar mechanism is formed by the two rockers, the platform and the ignition gun; an electro-hydraulic push rod for driving the rocker to swing is arranged on the platform.

2. A blast furnace top ignition device as claimed in claim 1, characterized in that The electro-hydraulic push rod is controlled by a limit switch arranged on the platform.

3. A blast furnace top ignition device as claimed in claim 1, characterized in that A support is provided on the platform, and the upper ends of the two rockers are pivotally connected to the support.

4. A blast furnace top ignition device as claimed in claim 1, characterized in that The ignition gun is a sleeve-type structure consisting of inner and outer tubes, the inner tube is fixed in the outer tube, a gas delivery channel with a circular cross section is formed between the inner and outer tubes, and the front end of the outer tube constitutes the gun head.

5. A blast furnace top ignition device as claimed in claim 4, characterized in that A connecting block is fixedly provided on the tube wall at the rear of the outer tube, and two pivoting parts are arranged at intervals on the connecting block. The bottom ends of the two parallel rockers are pivotally connected to the two pivoting parts respectively.

6. A blast furnace top ignition device as claimed in claim 4, characterized in that A plurality of side holes are arranged circumferentially on the side wall of the gun head.

7. A blast furnace top ignition device as claimed in claim 4, characterized in that The tail of the outer tube is fixedly connected to a first hose for conveying oxygen-enriched air by a quick connector; the tail of the inner tube is fixedly connected to a second hose for conveying fuel gas by a quick connector.

8. A blast furnace top ignition device as claimed in claim 7, characterized in that The first hose is provided with two air inlet valves.

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