CN102912050A - Freeze protection method for material ramming and mud jacking of cooling wall in winter overhaul of blast furnace - Google Patents

Freeze protection method for material ramming and mud jacking of cooling wall in winter overhaul of blast furnace Download PDF

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Publication number
CN102912050A
CN102912050A CN2012104293356A CN201210429335A CN102912050A CN 102912050 A CN102912050 A CN 102912050A CN 2012104293356 A CN2012104293356 A CN 2012104293356A CN 201210429335 A CN201210429335 A CN 201210429335A CN 102912050 A CN102912050 A CN 102912050A
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CN
China
Prior art keywords
blast furnace
temperature
cooling
mud jacking
cooling stave
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2012104293356A
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Chinese (zh)
Inventor
赵鹏
张恒良
刘炎
刘德辉
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Publication date
Application filed by Angang Steel Co Ltd filed Critical Angang Steel Co Ltd
Priority to CN2012104293356A priority Critical patent/CN102912050A/en
Publication of CN102912050A publication Critical patent/CN102912050A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a freeze protection method for material ramming and mud jacking of a cooling wall in winter overhaul of a blast furnace. The method the steps of (1) carrying out blast insulation on the interior of the blast furnace with a hot-blast furnace; (2) paving an insulating layer outside the blast furnace jacket, and building an insulating shed for insulation; (3) measuring the temperature in the material ramming position of the cooling wall gap with a temperature measurement gun, and constructing when the temperature is above zero; (4) beginning baking the blast furnace; (5) overall detecting the temperature of the blast furnace casing with the temperature measurement gun, and preparing mud jacking of the cooling wall when the furnace casing temperature is high than 6 DEG C; (6) determining the mud jacking position between the cooling wall and the blast furnace casing; (7) firstly welding a press-in hole stub in the mud jacking position, and then perforating by adopting a drill; and (8) pressing-in a refractory material between the blast furnace jacket and the cooling wall by the stub. Compared with the prior art, the method has the benefits of prolonging the service life of the blast furnace, ensuring winter construction and overhaul quality of the blast furnace, promoting regular production and operation of the blast furnace after blowing-in, and improving the economic benefit of the enterprise.

Description

A kind of blast furnace overhaul in winter cooling stave is smash material mud jacking means to prevent freezing
Technical field
The present invention relates to the blast-furnace smelting field, particularly a kind of blast furnace overhaul in winter cooling stave is smash material mud jacking means to prevent freezing.
Background technology
Because the design defect of blast furnace itself, the selection of the anti-material in cupola well position, the reasons such as cupola well zone cooling power deficiency, each position temperature of blast furnace raises very fast, even generation hearth breakout accident, so taked increase cupola well water supply straight tube to increase cooling water inflow, newly-increased cupola well heat flow rate per unit area detects, use the measures such as schreyerite maintenance, and change according to the temperature of the furnace hearth field and to adjust accordingly, but along with the stove labour time lengthens, the situation that abnormal erosion appears in the cupola well zone progressively increases the weight of, showing as iron mouth cupola well zone heat flow rate per unit area continues to raise, surpass warning value, blast furnace is forced to take to reduce combustion intensity, stop oxygen enrichment, the operation of stifled air port, until the measures such as the cool stove of damping down, keep reluctantly the low-level production of blast furnace, for thoroughly eliminating the safety in production hidden danger in blast furnace hearth zone, must carry out thorough overhaul to blast furnace, but the overhaul of blast furnace is never constructed in winter, because cold weather, the gravity flow pouring material that slit between material and cooling stave and the shell of blast furnace is smash at cooling stave and cooling wall joint place is constructed under cold snap and is easily frozen, make joint filling place smash the material and the mud jacking refractory materials freeze to go bad, lose original character of refractory materials, affect the normal production run of blast furnace and blast furnace campaign after the blow-on, therefore, blast furnace also will continue keeping low-level production, cause the performance of enterprises to reduce, exist simultaneously potential safety hazard.
Summary of the invention
The purpose of this invention is to provide a kind ofly during blast furnace overhaul in winter, prevent that gravity flow pouring material, joint filling place from smashing material and the mud jacking refractory materials method freezing to go bad, effectively raise blast furnace campaign and production efficiency.
For achieving the above object, the present invention realizes by the following technical solutions:
A kind of blast furnace overhaul in winter cooling stave is smash material mud jacking means to prevent freezing, may further comprise the steps:
1) with hotblast stove to the insulation of blowing in the blast furnace, satisfy the cooling stave slit and smash needed temperature of when material, guarantee to smash the material material and do not endure cold rotten;
2) lay thermal insulation layer last furnace shell is outside, and set up warming canopy and be incubated, guarantee that cold gas stream does not enter or enters less in the State of Blast Furnace;
3) with temperature-measuring gun the material place is smash in the cooling stave slit and carry out thermometric, confirm to construct on the zero temperature, if temperature does not reach and smashes the needed temperature of material and stop work immediately, strengthen little Combustion of Hot Air Furnace, to improve temperature in the stove;
4) when blast furnace hearth build by laying bricks or stones complete, cooling stave installs smashes material when complete with the cooling stave slit, begins to toast blast furnace;
5) with temperature-measuring gun complete detection shell of blast furnace temperature, treat that beginning to carry out the cooling stave mud jacking more than stove skin temperature 6 degree prepares;
6) determine mud jacking position between cooling stave and the shell of blast furnace, four cooling plate central positions that the mud jacking position should be between the 6th in blast furnace and the 7th cooling stave;
7) when blast furnace staying, at first welding is pressed into the hole short tube at the mud jacking position, then adopts the drilling machine perforate, and opening diameter is generally Φ 28mm or Φ 35mm;
8) by short tube refractory materials is pressed between last furnace shell and the cooling stave.
Present method also is applicable to following situation: after 1) the cooling plate flange portion is changed; 2) the wind passage is altered at the cooling stave back; 3) installation of micro cooler; 4) installation in air port; 5) lining of shaft is local safeguards.
Compared with prior art, the invention has the beneficial effects as follows:
A kind of blast furnace overhaul in winter cooling stave is smash material mud jacking means to prevent freezing, prevented that effectively cooling stave and cooling wall joint place from smashing between material, cooling stave and the shell of blast furnace slit gravity flow pouring material and refractory materials freezes to go bad, prevented that refractory materials from losing original character, prolonged the work-ing life of blast furnace, guaranteed blast furnace winter construction Overhaul Quality, impel the normal production run of blast furnace after the blow-on, improved the economic benefit of enterprise.
Embodiment
The below further specifies the specific embodiment of the present invention:
A kind of blast furnace of the present invention overhaul in winter cooling stave is smash material mud jacking means to prevent freezing, may further comprise the steps:
1) with hotblast stove to the insulation of blowing in the blast furnace, satisfy the cooling stave slit and smash needed temperature of when material, guarantee to smash the material material and do not endure cold rotten;
2) lay thermal insulation layer last furnace shell is outside, and set up warming canopy and be incubated, guarantee that cold gas stream does not enter or enters less in the State of Blast Furnace;
3) with temperature-measuring gun the material place is smash in the cooling stave slit and carry out thermometric, confirm to construct on the zero temperature, if temperature does not reach and smashes the needed temperature of material and stop work immediately, strengthen little Combustion of Hot Air Furnace, to improve temperature in the stove;
4) when blast furnace hearth build by laying bricks or stones complete, cooling stave installs smashes material when complete with the cooling stave slit, begins to toast blast furnace;
5) with temperature-measuring gun complete detection shell of blast furnace temperature, treat that beginning to carry out the cooling stave mud jacking more than stove skin temperature 6 degree prepares;
6) determine mud jacking position between cooling stave and the shell of blast furnace, four cooling plate central positions that the mud jacking position should be between the 6th in blast furnace and the 7th cooling stave;
7) when blast furnace staying, at first welding is pressed into the hole short tube at the mud jacking position, then adopts the drilling machine perforate, and opening diameter is generally Φ 28mm or Φ 35mm;
8) by short tube refractory materials is pressed between last furnace shell and the cooling stave.
Present method also is applicable to following situation:
1) after the cooling plate flange portion is changed: after replacing is leaked out at blast furnace cooling board generation back, there is the gap around the blast furnace cooling board, at this moment need to utilize this method that specific refractory materials is inserted the gap, improve the cooling performance of blast furnace cooling board, owing to being take filling blast furnace lining gap as main purpose, be only applicable to cool off board-like blast furnace.
2) the wind passage is altered at the cooling stave back: cooling stave is installed on the last furnace shell inboard, exist certain gap between cooling stave after the installation and the furnace shell, need generally speaking to utilize design pre-opened hole on the furnace shell to be pressed into refractory materials and carry out filling, if these gaps still exist after the normal production of blast furnace, to form at the cooling stave back side and alter the wind passage, cause furnace shell rubescent, at this moment need to utilize former pre-opened hole or new boring, with this method specific refractory materials is fills up to gap, cooling stave back, wind is altered at the back of minimizing and elimination cooling stave.
3) installation of micro cooler: when being installed in the cooling apparatus on the blast furnace because design is not enough, produce the reasons such as load increasing or cooling apparatus breakage, when causing the comprehensive cooling intensity of body of heater not adapt to furnace heat load, the furnace lining aggravation of deteriorating, even furnace shell is rubescent, directly affect the work-ing life of body of heater, at this moment relatively effective means is installed micro cooler at body of heater exactly, to replenish the cooling intensity of body of heater, at this moment the hole that can on furnace shell, bore when micro cooler is installed, utilize this method that the refractory materials with lining repairing performance is pressed in the stove, reach the purpose of fettling.
4) installation in air port: owing to considering the expansion of furnace lining, in the installation process of air port, generally all be provided with the expansion clearance, and filling buffering filler, at blast oven with after going into operation, if the expansion clearance of these reservations does not fully absorb, then may become the passage of coal gas of high temperature, for these passages of shutoff, need to adopt this method that specific refractory materials is pressed in tuyere big sleeve or the middle cover, reach the purpose of shutoff passage.
5) lining of shaft is local safeguards: behind the blast furnace life-time service, be subjected to the wearing and tearing of furnace charge, the erosion of chemistry and the effect of thermal stresses, the continuous attenuate of blast furnace lining, local furnace shell is rubescent even be directly exposed in the furnace charge when serious, maintenance for this locality, utilizing this method maintenance is a kind of reasonable mode, be that so-called being pressed into made lining, this press mode is divided into common being pressed into hard and is pressed into, it should be noted that, a precondition need to be arranged when utilizing this press mode operation: being pressed into the position has furnace charge to exist, and not yet melting of furnace charge.

Claims (2)

1. blast furnace overhaul in a winter cooling stave is smash material mud jacking means to prevent freezing, it is characterized in that, may further comprise the steps:
1) with hotblast stove to the insulation of blowing in the blast furnace, satisfy the cooling stave slit and smash needed temperature of when material, guarantee to smash the material material and do not endure cold rotten;
2) lay thermal insulation layer last furnace shell is outside, and set up warming canopy and be incubated, guarantee that cold gas stream does not enter or enters less in the State of Blast Furnace;
3) with temperature-measuring gun the material place is smash in the cooling stave slit and carry out thermometric, confirm to construct on the zero temperature, if temperature does not reach and smashes the needed temperature of material and stop work immediately, strengthen little Combustion of Hot Air Furnace, to improve temperature in the stove;
4) when blast furnace hearth build by laying bricks or stones complete, cooling stave installs smashes material when complete with the cooling stave slit, begins to toast blast furnace;
5) with temperature-measuring gun complete detection shell of blast furnace temperature, treat that beginning to carry out the cooling stave mud jacking more than stove skin temperature 6 degree prepares;
6) determine mud jacking position between cooling stave and the shell of blast furnace, four cooling plate central positions that the mud jacking position should be between the 6th in blast furnace and the 7th cooling stave;
7) when blast furnace staying, at first welding is pressed into the hole short tube at the mud jacking position, then adopts the drilling machine perforate, and opening diameter is Φ 28mm or Φ 35mm;
8) by short tube refractory materials is pressed between last furnace shell and the cooling stave.
2. a kind of blast furnace overhaul in winter cooling stave according to claim 1 is smash material mud jacking means to prevent freezing, it is characterized in that, present method also is applicable to following situation: after 1) the cooling plate flange portion is changed; 2) the wind passage is altered at the cooling stave back; 3) installation of micro cooler; 4) installation in air port; 5) lining of shaft is local safeguards.
CN2012104293356A 2012-10-30 2012-10-30 Freeze protection method for material ramming and mud jacking of cooling wall in winter overhaul of blast furnace Pending CN102912050A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105452491A (en) * 2013-08-06 2016-03-30 新日铁住金工程技术株式会社 Hot-blast stove construction method
CN110527759A (en) * 2018-06-22 2019-12-03 广东韶钢松山股份有限公司 A method of prevent blast furnace taphole from leaking coal gas

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11229011A (en) * 1998-02-16 1999-08-24 Kawasaki Steel Corp Method for repairing furnace body of blast furnace
JP2006003040A (en) * 2004-06-21 2006-01-05 Hirohata Furnace Co Ltd Joint structure in furnace inner wall
CN101289698A (en) * 2008-06-06 2008-10-22 武汉宏程冶金材料有限公司 Blast furnace pressing-in grouting and lining-making construction method
CN101851692A (en) * 2010-06-02 2010-10-06 河北省首钢迁安钢铁有限责任公司 Construction method for curing non-aqueous slurry at normal temperature in blast furnace

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11229011A (en) * 1998-02-16 1999-08-24 Kawasaki Steel Corp Method for repairing furnace body of blast furnace
JP2006003040A (en) * 2004-06-21 2006-01-05 Hirohata Furnace Co Ltd Joint structure in furnace inner wall
CN101289698A (en) * 2008-06-06 2008-10-22 武汉宏程冶金材料有限公司 Blast furnace pressing-in grouting and lining-making construction method
CN101851692A (en) * 2010-06-02 2010-10-06 河北省首钢迁安钢铁有限责任公司 Construction method for curing non-aqueous slurry at normal temperature in blast furnace

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
中国金属学会: "《2002年全国炼铁生产技术会议暨炼铁年会文集》", 31 December 2002 *
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105452491A (en) * 2013-08-06 2016-03-30 新日铁住金工程技术株式会社 Hot-blast stove construction method
CN110527759A (en) * 2018-06-22 2019-12-03 广东韶钢松山股份有限公司 A method of prevent blast furnace taphole from leaking coal gas

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Application publication date: 20130206