CN202047074U

CN202047074U - Belly pipe for blast furnace

Info

Publication number: CN202047074U
Application number: CN2011200782284U
Authority: CN
Inventors: 郑庆荣; 朱锦明; 姜伟忠; 王天球; 陈俊; 费明; 钱东生
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2011-03-23
Filing date: 2011-03-23
Publication date: 2011-11-23
Anticipated expiration: 2021-03-23

Abstract

The utility model discloses a belly pipe for a blast furnace. The belly pipe comprises a belly pipe gun package, a first ball check valve, a connecting pipe, a second ball check valve, and a coal gun fixing and clamping seat, which are fixedly connected in sequence, wherein an air purging pipe is arranged on the connecting pipe and provided with a purging valve and a safety relief valve. Through the belly pipe for the blast furnace, a coal gun can be directly replaced in normal production, which plays a positive role in the uniform injection of the blast furnace and the stabilization of the furnace condition.

Description

The blast furnace belly pipe

Technical field

The utility model relates to a kind of blast furnace belly pipe, particularly a kind of blast furnace belly pipe that can online replacing coal rifle.

Background technology

Furnace coal spraying technology is the present production technique taked of domestic and international most of blast furnace, can reduce the ironmaking production cost to greatest extent, be to improve one of the most effective means of productivity effect.The coal rifle of blast furnace is in the actual production use, and the coal rifle that has burns out coal rifle rifle head running into blast-furnace tuyere pour slag, causes coal rifle stop-spraying; Itself there are quality problems in the coal rifle that has, as coal rifle rifle head bloom, rifle head body cracking, trachoma or elbow weld cracking etc., all can cause the coal circulation to, can only make the stop-spraying purge in the production.The coal rifle break down or stop-spraying after because the structure problem of existing blast furnace belly pipe is changed the coal rifle in the time of can only waiting until the blast furnace periodical repair.Because the present blast furnace periodical repair cycle long (about 4 months), the coal rifle damages long-time stop-spraying, so both influenced the processing requirement of the even spray of wide spray of pulverized coal injection, even can cause that the even activity of cupola well descends, and can cause that again the operation of blast furnace cost rose because of the decline of coal powder injection ability.

Fig. 1 is the structural representation of existing blast furnace belly pipe, as shown in the figure, the blast furnace belly pipe comprises belly pipe body 100, belly pipe body 100 is provided with the belly pipe rifle bag 101 that is used to insert coal rifle 600, the inlet of described belly pipe rifle bag 101 is fixedly connected with a ball check valve 200, is fixedly connected with coal rifle Fixing clamp-seat 300 on the ball check valve 200.The minimum diameter of ball check valve 200 is identical with the diameter of rifle bag 101.Because the singularity that blast furnace is produced will be extracted coal rifle 600 in ordinary production, there is high temperature and high pressure gas to spray the danger that injures operator, not tight as ball check valve 200 closures, blast furnace then is forced to subtract normal pressure or damping down.As inserting the coal rifle in the ordinary production, operator will head on huge furnace pressure, and dangerous matter sources such as coal gas of high temperature and red Jiao of particle are so adopt existing blast furnace belly pipe not allow to change the coal rifle in the blast furnace ordinary production.

The utility model content

For addressing the above problem, the utility model provides a kind of blast furnace belly pipe, can online replacing coal rifle, guarantee blast furnace steady running.

For achieving the above object, blast furnace belly pipe of the present utility model, comprise the belly pipe rifle bag, first ball check valve, pipe connecting, second ball check valve and the coal rifle Fixing clamp-seat that are fixedly connected sequentially, described pipe connecting is provided with the air purge pipe, and described air purge pipe is provided with blow down valve and safety relief valve.

The inwall of described pipe connecting has flame retardant coating.

Adopt blast furnace belly pipe of the present utility model, in ordinary production, can extract, insert the coal rifle, therefore can not need blast furnace checking or damping down, directly change the coal rifle, the even spray operation of blast furnace, the working of a furnace stable played positive effect, meet high-coal ratio, low cost under the current blast furnace big coal injection condition, and provide strong guarantee for the stable smooth operation of blast furnace.

Description of drawings

Fig. 1 is the structural representation of existing blast furnace belly pipe;

Fig. 2 is the structural representation of blast furnace belly pipe of the present utility model, the state that inserts for the coal rifle shown in the figure;

Fig. 3 is the enlarged diagram of a-quadrant among Fig. 1, the state that does not insert for the coal rifle shown in the figure.

Embodiment

Fig. 2 is the structural representation of blast furnace belly pipe of the present utility model, and Fig. 3 is the enlarged diagram of a-quadrant among Fig. 1.As shown in the figure, blast furnace belly pipe of the present utility model comprises belly pipe rifle bag 11, first ball check valve 20, pipe connecting 40, second ball check valve 50 and the coal rifle Fixing clamp-seat 30 that is fixedly connected sequentially, on the described pipe connecting 40 air purge pipe 41 is set, described air purge pipe 41 is provided with blow down valve 42 and safety relief valve 43.

The mutual mode of connection of the belly pipe rifle bag 11 that is fixedly connected sequentially, first ball check valve 20, pipe connecting 40, second ball check valve 50 and coal rifle Fixing clamp-seat 30 all can adopt flange to be connected.

Belly pipe rifle bag 11 is the oblique cutting pipes that are used to insert coal rifle 60 on the belly pipe body 10.The structure of first ball check valve 20 and second ball check valve 50 is identical with ball check valve 200 in the existing blast furnace belly pipe shown in Figure 1.First ball check valve 20 and second ball check valve 50 are check valve, by the stressed switch that upwards moves or realize valve to the whereabouts under action of gravity of the intravital bulb of valve.

First ball check valve 20 directly is connected with belly pipe rifle bag 11 flanges, onlinely plays the first road sealing function when extracting coal rifle 60, for extracting smoothly of coal rifle 60 laid a good foundation.

Air purge pipe 41 can be connected with external air source, and its effect is that sweeping gas is conveyed in pipe connecting 40 passages, opens and closes external sweep gas by blow down valve 42 before coal rifle 60 is extracted, and before coal rifle 60 online extracting coal rifle 60 front ends is cooled off purging; Spheroid and trim to first ball check valve 20 purge, and prevent that the sealing position that the particulate state foreign material are attached on ball valve and spheroid from causing poor sealing and gas leakage takes place, and guarantee the good seal of ball valve spheroid contact surface.

The inner-wall spraying of pipe connecting 40 has flame retardant coating, and flame retardant coating can play heat insulation effect, helps reducing local temperature, prolongs the work-ing life of pipe connecting 40.

Second ball check valve 50 is installed between coal rifle Fixing clamp-seat 30 and the pipe connecting 40, and its function mainly plays sealing function when tiny leakage takes place first ball check valve 20.

Coal rifle Fixing clamp-seat 30 is used for the fixing and sealing of coal rifle 60, and is identical with existing coal rifle Fixing clamp-seat structure.

On air purge pipe 41, preferably also be provided with safety relief valve 43, its major function be in the discharging pipe connecting 40 overbottom pressure and when the external gas source pipe of dismounting the residual air in the discharge tube, avoid external gas source pipe to be injured operator, to improve the security of operation by irregular throwing away.

When the coal rifle has problem to change in the blast furnace normal productive process two operation stepss are arranged: draw guns and the operation of plug in rifle.

When drawing guns operation, earlier air purge pipe 41 can be connected with external air source, and open blow down valve 42, open slightly and close after safety relief valve 43 confirms to have gas to discharge; Using special-purpose strike spanner to unclamp coal rifle 60 subsequently pulls out outward, when the head of coal rifle 60 has been extracted first ball check valve 20 and has been arrived in the pipe connecting 40, close external gas source valve, open safety relief valve 43, confirm whether continue to have gas to discharge,, the not sealing fully of first ball check valve 20 is described if having, then need to purge once more the sphere of first ball check valve 20, till the no gas of safety relief valve 43 outlets is discharged; At last coal rifle 60 is separated with coal rifle Fixing clamp-seat 30, and extract coal rifle 60 fully.

When plugging in the rifle operation, earlier new coal rifle 60 heads are inserted in the pipe connecting 40, and coal rifle 60 and coal rifle Fixing clamp-seat 30 is effectively fixing; Open external gas source valve subsequently, open safety relief valve 43 slightly, confirm to have gas to discharge and promptly close, open blow down valve 42, after coal rifle 60 rifle heads entered first ball check valve 20, external sweeping gas purged the coal rifle in the belly pipe rifle bag 11, plays the effect of cooling; Continue to insert coal rifle 60, enter the central position, air port until coal rifle 60 rifle heads.

Claims

1. blast furnace belly pipe, it is characterized in that, comprise the belly pipe rifle bag, first ball check valve, pipe connecting, second ball check valve and the coal rifle Fixing clamp-seat that are fixedly connected sequentially, described pipe connecting is provided with the air purge pipe, and described air purge pipe is provided with blow down valve and safety relief valve.

2. blast furnace belly pipe as claimed in claim 1 is characterized in that the inwall of described pipe connecting has flame retardant coating.