CN102392091B

CN102392091B - Gas isolation method used during drying of hot-blast stove in iron works

Info

Publication number: CN102392091B
Application number: CN 201110334485
Authority: CN
Inventors: 赵家贵; 刘守城
Original assignee: China MCC17 Group Co Ltd
Current assignee: China MCC17 Group Co Ltd
Priority date: 2011-10-30
Filing date: 2011-10-30
Publication date: 2013-04-24
Anticipated expiration: 2031-10-30
Also published as: CN102392091A

Abstract

The present invention relates to a gas isolation method used during the drying of a hot-blast stove in an iron works, and belongs to the construction method of a hot-blast stove. The method is characterized in that a left and a right high-alumina brick partition walls are arranged near a wind-mixing pipe by corresponding to the left part of a manhole in the inner cavity of a hot-blast main; high-alumina bricks are pre-placed before the left and the right partition walls are made; lines are drawn on arc bricks, and then the arc bricks are finish-machined and numbered; a stove builder makes the walls layer by layer from the bottom and fills the joints layer by layer, near a right hot-blast branch pipe in the hot-blast main; when the left and the right partitions are made 700mm from the top, the stove builder moves across the left and the right partitions to one side of the wind-mixing pipe to finish making the rest of the walls; the mortar plumpness is up to 95%; the size of mortar joints is 2 mm plus or minus 1mm; the thicknesses of the left and the right partition walls range from 230 to 250mm on average; refractory layers are applied to the outer surfaces of the left and the right partition walls; and the thickness of the refractory layers can range from 2 to 3mm. The method can effectively isolate gas. The hot-blast pipe and a blast furnace are made simultaneously, which guarantees the schedule.

Description

Gas isolation method used during drying of hot-blast stove in iron works

Technical field

The invention belongs to the hotblast stove constructional method, especially relate to a kind of method of gas isolation of hotblast stove.

Background technology

At present, hot-blast stove baking oven and hot air duct in the iron work construction, blast furnace is built by laying bricks or stones simultaneously and is carried out, the method of its isolated coal gas Leakage prevention, to realize gas isolation by at the hot blast valve flange steel blind plate being set, by the steel blind plate, aluminium matter packing ring and joint bolt are combined to form the barrier means of baker coal gas, after the gas leak detector test is confirmed without gas leak, the side shows that the gas isolation device is effective, the drawback that this device exists is: when removing the steel blind plate, will inevitably the refractory fiber blanket in the hot blast valve place dilatation joint be caused than havoc, and the assembling and disassembling spended time is longer, the hot blast manifold shell that very easily occurs the hot blast valve place after blast furnace is gone into operation is rubescent, even causing the hot blast manifold explosion, impact is normally produced and is had a potential safety hazard.

Summary of the invention

The purpose of this invention is to provide a kind of gas isolation method used during drying of hot-blast stove in iron works, safe and reliable, effectively cut off coal gas during hot-blast stove baking oven, assurance hot air duct and building by laying bricks or stones simultaneously of blast furnace are carried out, and guarantee the construction period.

The object of the present invention is achieved like this: a kind of gas isolation method used during drying of hot-blast stove in iron works, hot-blast main's 4 usefulness respectively are equipped with the hot blast manifold 7 corresponding hotblast stoves 5 that connect of hot blast valve 3, this hot-blast main's 4 right-hand member section is connected again mixed wind furnace 6 and manhole 8 is set, manhole 8 is for maintainer's discrepancy, it is characterized in that in hot-blast main 4 inner chamber near mixing wind tube 6 and the corresponding left part position that is positioned at manhole 8, be the compartment of terrain and build left and right sides partition wall 1 by laying bricks or stones, this left and right sides partition wall 1 all available high alumina brick is built by laying bricks or stones, this left and right sides partition wall 1 is built by laying bricks or stones and frontly first high alumina brick is put in advance, to all circular arc face brick setting-out precision work and be numbered, the brickwork worker is in hot-blast main's 4 interior sides near right hot blast manifold 7, successively build (each circular arc face brick by number correspondence is built by laying bricks or stones) by laying bricks or stones from the bottom, and successively jointing, when left and right sides partition wall 1 is built by laying bricks or stones apart from top 700 mm, the body of wall that the brickwork worker strides across left and right sides partition wall 1 is transferred to a side of mixing wind tube 6, still successively build by laying bricks or stones with successively jointing and finish building by laying bricks or stones of residue body of wall, build by laying bricks or stones and require the mortar plumpness to reach 95%, the mortar joint size is controlled at 2 ± 1 mm, the wall thickness of this left and right sides partition wall 1 all can reach 230-250 mm, the wall thickness of this left and right sides partition wall 1 is all take 232 mm as good, and between left and right sides partition wall 1 stuffed heat insulated layer 2, this thermofin 2 can be ceramic fiber blanket, thermofin 2 thick 10-20 mm that can be, and this thermofin 2 is thick take 10 mm as good, left and right sides partition wall 1 is built by laying bricks or stones when finishing, outside surface at right partition wall is smeared flame retardant coating, this flame retardant coating can be the refractory mortar of mixing glass, fire-resistant bed thickness can be 2-3mm, this fire-resistant bed thickness is take 2mm as good, after left and right sides partition wall 1 was built end by laying bricks or stones, the brickwork worker from manhole 8 out.

After three hotblast stove 5 bakers finish, carry out cool stove, flue gas is emptying, for guaranteeing personnel safety, detect remaining gas concentration with gas leak detector, after confirming to meet safety requirements, carry out dismounting, cleaning, manhole 8 shutoff of the double-deck high alumina brick partition wall 1 of baker, can carry out at last the baker of hot air duct, blast furnace.

Gas isolation method used during drying of hot-blast stove in iron works proposed by the invention, safe and reliable, effectively cut off coal gas during baker, assurance hot air duct and building by laying bricks or stones simultaneously of blast furnace are carried out, and have guaranteed the construction period.

Now in conjunction with the accompanying drawings and embodiments gas isolation method used during drying of hot-blast stove in iron works proposed by the invention is further described.

Description of drawings

Fig. 1 is the synoptic diagram of gas isolation method used during drying of hot-blast stove in iron works proposed by the invention.

Among Fig. 1: 1, partition wall 2, thermofin 3, hot blast valve 4, hot-blast main 5, hotblast stove 6, mixing wind tube 7, hot blast manifold 8, manhole

Embodiment

This gas isolation method used during drying of hot-blast stove in iron works, successful Application in the 1# of Jiujiang steel mill, 2#1780 m3 blast furnace engineering, the 1080m3 of Jiujiang steel mill blast furnace engineering; The 1# of Jiujiang steel mill, 2#1780 m3 blast furnace engineering hot-blast main's the thick 232mm that is of bore 2368 mm, left and right sides partition wall, thermofin between the partition wall of the left and right sides is ceramic fiber blanket, heat insulation bed thickness 10 mm, flame retardant coating is the refractory mortar of mixing glass, fire-resistant bed thickness 2 mm, duration shortens 25 days, 330000 yuan of costs; The 1080 m3 blast furnace engineering hot-blast mains' of Jiujiang steel mill bore 2368 mm, the thick 232mm that is of left and right sides partition wall, thermofin between the partition wall of the left and right sides is ceramic fiber blanket, heat insulation bed thickness 10 mm, this flame retardant coating are the refractory mortar of mixing glass, fire-resistant bed thickness 2 mm, duration shortens 30 days, 288000 yuan of costs.

Claims

1. gas isolation method used during drying of hot-blast stove in iron works, it is characterized in that in the inner chamber of hot-blast main (4) being positioned near mixing wind tube (6) and correspondence the left part position of manhole (8), be the compartment of terrain and build left and right sides partition wall (1) by laying bricks or stones, this left and right sides partition wall (1) is all built by laying bricks or stones with high alumina brick, this left and right sides partition wall (1) is built by laying bricks or stones and frontly first high alumina brick is put in advance, to all circular arc face brick setting-out precision work and be numbered, one side of brickwork worker close right hot blast manifold (7) in hot-blast main (4), successively build by laying bricks or stones from the bottom, and successively jointing, when left and right sides partition wall (1) is built by laying bricks or stones apart from top 700 mm, the body of wall that the brickwork worker strides across left and right sides partition wall (1) is transferred to a side of mixing wind tube (6), still successively build by laying bricks or stones with successively jointing and finish building by laying bricks or stones of residue body of wall, build the mortar plumpness by laying bricks or stones and reach 95%, the mortar joint size is controlled at 2 ± 1 mm, the wall thickness of left and right sides partition wall (1) all reaches 230-250 mm, and between left and right sides partition wall (1) stuffed heat insulated layer (2), this thermofin (2) is ceramic fiber blanket, thermofin (2) is thick to be 10-20mm, left and right sides partition wall (1) is built by laying bricks or stones when finishing, outside surface at right partition wall is smeared flame retardant coating, this flame retardant coating is the refractory mortar of mixing glass, this fire-resistant bed thickness is 2-3mm, after left and right sides partition wall (1) was built end by laying bricks or stones, the brickwork worker from manhole (8) out.

2. gas isolation method used during drying of hot-blast stove in iron works according to claim 1 is characterized in that the wall thickness of this left and right sides partition wall (1) all reaches 232 mm, and thermofin (2) is thick to be 10 mm.

3. gas isolation method used during drying of hot-blast stove in iron works according to claim 1 is characterized in that fire-resistant bed thickness is 2mm.