CN210945659U

CN210945659U - Online replacing device for blast furnace coal injection gun

Info

Publication number: CN210945659U
Application number: CN201921658818.7U
Authority: CN
Inventors: 刘潮; 施雪松
Original assignee: Jiangsu Shagang Group Co Ltd; Zhangjiagang Hongchang Steel Plate Co Ltd
Current assignee: Jiangsu Shagang Group Co Ltd; Zhangjiagang Hongchang Steel Plate Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-07-07
Anticipated expiration: 2029-09-30

Abstract

The utility model discloses an online replacing device for a blast furnace coal injection gun, which comprises a ball valve, a transition pipe and a clamping device, wherein the ball valve comprises a bent pipe and a straight pipe, the straight pipe is positioned at the tangent position of the bent pipe, one end of the bent pipe is an opening, the other end of the bent pipe is closed, and balls are arranged in the bent pipe; the end part of the transition pipe is connected with the opening end of the bent pipe; the clamping device is detachably arranged on the transition pipe, and the coal injection gun is fixed on the clamping device. Compared with the prior art, the utility model discloses a device is changed on line to blast furnace jetting coal rifle can change the coal rifle under blast furnace operating condition, has improved blast furnace work efficiency, avoids dangerous accident.

Description

Online replacing device for blast furnace coal injection gun

Technical Field

The utility model relates to an online replacing device for a blast furnace coal injection gun, belonging to the technical field of metallurgical blast furnaces.

Background

In the prior art, the blast furnace coal spray gun is a main device for spraying the blast furnace coal powder, the coal gun for spraying the blast furnace coal powder mainly comprises a straight pipe barrel consisting of an inner sleeve and an outer sleeve, and a coal powder inlet, an outer layer compressed air inlet and an inner layer compressed air inlet which are arranged on the straight pipe barrel, and the other end of the barrel, which is opposite to the coal gas inlet, is a spraying opening. However, the coal guns are obliquely inserted into the tuyere through the blast furnace air supply branch pipe, and the straight pipe coal guns blow coal powder on the tuyere, so that slag is hung at the front end of the tuyere and the tuyere is abraded, or the front end is deformed and the coal guns are forced to stop using, thereby influencing the service life of the tuyere.

Because the old coal gun jacks up the marble in the marble valve through the gun head to blow coal, the old marble valve can only be pulled out or installed with the coal gun in a maintenance state, and the marble falls to block the air port of the marble valve, so that the safety can be ensured. However, in the production state, because the furnace is in a high-temperature and high-pressure closed state, if the coal guns are forcibly installed and removed on line, air leakage is easy to occur in the installation and removal processes of the coal guns, and danger exists. Therefore, even if the coal gun cannot be normally injected during normal production, the coal gun is prohibited from being replaced on line, so that the coal gun can only be replaced by using the opportunity of shutdown maintenance, the temporary blast break down of the blast furnace is increased due to frequent replacement of the tuyere, the operation rate of the blast furnace is reduced, coal cannot be uniformly injected in the periphery after the shutdown of the injection, the operation and the condition of the blast furnace are not smooth, and meanwhile, coke is required to be added for ensuring enough heat in the furnace, so that the production cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of the prior art and provides an online replacing device for a blast furnace coal injection gun.

In order to solve the technical problem, the utility model discloses a technical scheme is:

an online replacing device for a blast furnace coal injection gun comprises a ball valve, a transition pipe and a clamping device, wherein the ball valve is connected with a blast furnace; the ball valve comprises a bent pipe and a straight pipe, one end of the straight pipe is connected with the bent pipe, the other end of the straight pipe is connected with the blast furnace, the straight pipe is positioned at the tangent position of the bent pipe, one end of the bent pipe is open, the other end of the bent pipe is closed, the ball valve is in a vertical state, the closed end of the bent pipe is positioned at the upper part, balls for plugging the open end of the bent pipe are arranged in the bent pipe, and the diameter of the balls is larger than; the end part of the transition pipe is connected with the opening end of the bent pipe, and the straight pipe and the transition pipe are positioned on the same straight line; the clamping device is detachably arranged on the transition pipe, and the coal injection gun is fixed on the clamping device.

As a further preferable scheme, a locking device for fixing the coal injection gun is further arranged on the clamping device.

As a further preferred scheme, the clamping device is filled with a graphite packing, and the coal injection gun penetrates through the graphite packing.

As a further preferred solution, the length of the coal injection lance is greater than the length of the transition duct.

Compared with the prior art, the utility model discloses a device is changed on line to blast furnace jetting coal rifle can be under blast furnace operating condition, changes the coal rifle, and the blast furnace need not stop work, has improved blast furnace work efficiency, also improves the security of changing on line simultaneously, avoids dangerous accident.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

the coal injection device comprises a ball valve 1, a bent pipe 11, a straight pipe 12, a ball 13, a transition pipe 2, a clamping device 3, a locking device 4, a graphite packing 5 and a coal injection gun 6.

Detailed Description

The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The utility model discloses an online replacing device for a blast furnace coal injection gun, which comprises a ball valve 1, a transition pipe 2 and a clamping device 3, wherein the ball valve 1 is connected with the blast furnace, one end of the transition pipe 2 is arranged on the ball valve 1, and the clamping device 3 is arranged at the other end of the transition pipe 2;

the marble valve 1 comprises a bent pipe 11 and a straight pipe 12, one end of the straight pipe 12 is connected with the bent pipe 11, the other end of the straight pipe 12 is connected with the blast furnace, the straight pipe 12 is positioned at the tangent position of the bent pipe 11, one end of the bent pipe 11 is open, the other end of the bent pipe 11 is closed, the marble valve 1 is in a vertical state, the closed end of the bent pipe 11 is positioned at the upper part, marbles 13 used for plugging the open end of the bent pipe 11 are arranged in the bent pipe 11, and the diameters of the marbles 13; the end part of the transition pipe 2 is connected with the opening end of the bent pipe 11, and the straight pipe 12 and the transition pipe 2 are positioned on the same straight line; the clamping device 3 is detachably arranged on the transition pipe 2, the coal injection gun 6 is fixed on the clamping device 3, and the length of the coal injection gun 6 is larger than that of the transition pipe 2.

The transition pipe 2 is further improved, the lead of the marble 13 is increased, the joint between the falling point of the inner marble 13 and the rear coal gun is lengthened by about 260mm, a 'gun change transition region' is formed, and the coal gun can be changed on line.

The clamping device 3 is also provided with a locking device 4 for fixing the coal injection gun 6.

The chucking device 3 is filled with a graphite packing 5, the coal injection gun 6 penetrates through the graphite packing 5, and the graphite packing 5 is used for fixing and sealing the coal injection gun 6.

The utility model discloses a coal injection rifle 6 inserts chucking device 3 and gets into transition pipe 2, bullet 13 in the spring valve 1 until jack-up, when changing coal injection rifle 6, extract coal injection rifle 6, because coal injection rifle 6 is longer with the length of transition pipe 2, when coal injection rifle 6 extracts to in the transition pipe 2, but coal injection rifle 6 did not yet extract transition pipe 2 and chucking device 3 completely this moment, bullet 13 can fall and plug up the wind gap of spring valve 1, thereby avoid high temperature in the blast furnace, the personnel are hindered in the high-pressure gas blowout, extract coal injection rifle 6 at last completely and change.

The utility model discloses the economic benefits who produces: 1 coal gun is replaced on line every month of each blast furnace, the coal injection amount of each gun is 2t/h, coke is required to replace pulverized coal after the blast furnace is stopped and replaced, and the cost of each ton of coal is saved by 500 yuan compared with that of the coke. The annual benefit of 3 blast furnaces is as follows:

500 yuan x3 x 2t/hx24x365 days =109.5 ten thousand yuan/year

Can reach and change the coal rifle on line through reforming transform, the operating procedure is as follows:

dismantling an old coal gun:

1. and closing the coal gun valve, stopping coal injection, and opening the rear end valve to temporarily introduce nitrogen.

2. The locking device is loosened, the front end of the coal gun is retreated into the transition section, and the marble falls down to avoid air leakage.

3. And opening a rear end valve and stopping introducing temporary nitrogen. And slightly opening the rear end valve to confirm whether the marble is tightly sealed after falling.

4. And (3) detaching the clamping device when the sealing is tight, detaching the old coal gun, closing the valve if the sealing is not tight (rarely occurs), finely adjusting the marble, and detaching the coal gun after the sealing is confirmed.

Installing a new coal gun:

1. and pushing the clamping device to be close to the front end of the coal gun, placing the front end of the coal gun in the transition area, and tightening the clamping device.

2. And opening a rear end valve, and introducing temporary nitrogen into the rear end of the coal gun.

3. The locking device is loosened and inserted into the coal gun, the marble is jacked up, the position of the coal gun is adjusted, and the locking device is tightened.

4. And closing the rear end valve, stopping feeding the temporary nitrogen, and spraying the pulverized coal instead.

The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a device is changed on line to blast furnace jetting coal rifle which characterized in that: the blast furnace gas-liquid separation device comprises a marble valve (1), a transition pipe (2) and a clamping device (3), wherein the marble valve (1) is connected to a blast furnace, one end of the transition pipe (2) is arranged on the marble valve (1), and the clamping device (3) is arranged at the other end of the transition pipe (2); the marble valve (1) comprises an elbow (11) and a straight pipe (12), one end of the straight pipe (12) is connected with the elbow (11), the other end of the straight pipe (12) is connected with the blast furnace, the straight pipe (12) is positioned at the tangent position of the elbow (11), one end of the elbow (11) is open, the other end of the elbow (11) is closed, the marble valve (1) is in a vertical state, the closed end of the elbow (11) is positioned at the upper part, marbles (13) used for plugging the open end of the elbow (11) are arranged in the elbow (11), and the diameters of the marbles (13) are larger than the diameters of the open end; the end part of the transition pipe (2) is connected to the opening end of the bent pipe (11), and the straight pipe (12) and the transition pipe (2) are positioned on the same straight line; the clamping device (3) is detachably arranged on the transition pipe (2), and the coal injection gun (6) is fixed on the clamping device (3).

2. The on-line replacing device for the blast furnace coal injection gun according to claim 1, characterized in that: and the clamping device (3) is also provided with a locking device (4) for fixing the coal injection gun (6).

3. The on-line replacing device for the blast furnace coal injection gun according to claim 2, characterized in that: graphite packing (5) is filled in the clamping device (3), and a coal injection gun (6) penetrates through the graphite packing (5).

4. The on-line replacing device for the blast furnace coal injection gun according to claim 3, characterized in that: the length of the coal injection gun (6) is greater than that of the transition pipe (2).