CN101250598A - Maintaining method for blast furnace - Google Patents
Maintaining method for blast furnace Download PDFInfo
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- CN101250598A CN101250598A CNA2008100694619A CN200810069461A CN101250598A CN 101250598 A CN101250598 A CN 101250598A CN A2008100694619 A CNA2008100694619 A CN A2008100694619A CN 200810069461 A CN200810069461 A CN 200810069461A CN 101250598 A CN101250598 A CN 101250598A
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Abstract
The invention provides a protection process of a blast furnace, which is a process which combines the furnace body grouting for the positions where furnace shell has high temperature, the installation of copper cooling sticks on cooling wall damaging positions, and the spraying lining for furnace body lining, wherein grouting adopts the way of indentation grouting, high aluminum fire-proof material is pressed into the furnace shell through a grouter, and furnace body damaging positions are sprayed after spraying lining and descending stock-line through damping down. Through the process of the invention, the copper cooling sticks are installed on burned-out cooling walls through damping out after the cooling wall is burned out, and thereby reaching the same cooling effect with the cooling walls, simultaneously cooling wall acid cleaning technology is adopted to conduct treatment, thereby increasing cooling effect. The process can significantly increase the cooling effect of the blast furnace cooling walls, thereby making the blast furnace working type basically stable, significantly delaying the damage of cooling walls and reducing blowing-out medium repair time, and obtaining excellent economical benefits.
Description
Technical field
The present invention relates to the blast furnace protecting technology of iron work, the furnace retaining method in particularly a kind of later stage blast-furnace production campaign.
Background technology
Modern iron manufacturing process mainly carries out in blast furnace; blast furnace is to build the vertical cylindrical furnace that forms by laying bricks or stones by refractory materials; the furnace shell that has steel plate to make is outward reinforced sealing, embedded water cooler protection, and stove is divided into furnace throat, shaft, furnace bosh, bosh and cupola well from top to bottom successively.Ironmaking is at high temperature smelted into ore metallic iron exactly in blast furnace process, whole process be furnace charge from top to bottom, coal gas being in contact with one another in the process from bottom to top finish.The blast furnace in ironworks has just determined the life-span of blast furnace usually owing to the influence of factors such as designed capacity, material and construction when producing, designing, the life-span of blast furnace generally has 10 years, do not wait in 15 years, 20 years.Be blast furnace campaign 10 years be example, later stage blast-furnace production campaign is meant that generally blast furnace use to surpass 5 years, just can claim the furnace life of blast furnace to be in the later stage in furnace life since the 6th year.When blast furnace was in the later stage in furnace life, the refractory corrosion in the blast furnace was serious, operation type of furnace irregular, and furnace condition anterograde is poor, and quick, a large amount of damaged situation of cooling stave occurs now and then.These situations just need be overhauled blast furnace, and the furnace retaining measure is taked at damaged position after being occurred.
At present, on body of heater is safeguarded, take to monitor, control edge coal gas stream both at home and abroad usually, spray and make lining and the maintenance of other maintenance service reinforcement body of heater.Concrete maintaining method has: set up perfect surveillance and control measure, and as the blast-furnace cooled water temperature difference, each position temperature of blast furnace, each heat flow rate per unit area of blast furnace, cooling wall breakage, cooling stave pipe scaling, and the monitoring of blast furnace lining erosive; Strengthen blast furnace operating, control edge air-flow and raising water coolant effect, the ways such as heat flow rate per unit area of reduction cooling stave.
For long blast furnace of the time of coming into operation, because all multifactor influences, the heat flow rate per unit area on the blast furnace, cooling wall breakage, cooling stave pipe scaling, and the monitor and control facility imperfection of blast furnace lining.Therefore, this class blast furnace mode of generally taking to contain the titanium ore furnace retaining promptly adds a certain amount of titaniferous furnace charge blast furnace is safeguarded.Carry out furnace retaining even taked this mode, blast furnace to the later stage in furnace life the blast furnace lining spray material still can occur and come off seriously, furnace condition anterograde is poor, the situation of cooling wall breakage, and it is that affiliated field personnel have problem to be solved that blast furnace is taked effective furnace retaining measure.
Summary of the invention
At the prior art above shortcomings, the purpose of this invention is to provide and a kind of the blast furnace that is in the later stage in furnace life is improved cooling performance, improves the stable maintaining method for blast furnace of type in the blast furnace work.
The object of the present invention is achieved like this: a kind of maintaining method for blast furnace, it is characterized in that taking body of heater grouting is carried out at the high position of casing temperature, and copper-bar cooler is installed at the cooling wall breakage position, the lining of shaft is sprayed make the lining way of combining; Wherein, the mode of pressing-in grouting is taked in grouting, and high alumina matter refractory matter is pressed in the furnace shell by grout machine; Damping down sprayed the damaged position of shaft after the empty stockline of lining was made in spraying.
The step that the present invention installs copper-bar cooler to the cooling wall breakage position is:
1) water-cooled tube of removing damaged cooling wall;
2) hollow out the corresponding furnace shell in cooling wall breakage position (can be directly with the oxygen rifle burn cut or with the special-purpose machine drill hole of holing); As adopt the way of burning to be: to burn empty this position with the mode that oxygen and aluminum strip combine, help melting as early as possible the residue iron that hollows out the position;
The hole of 3) on cooling stave, opening, the size and the shape of the size in hole and shape and copper-bar cooler match;
4) copper-bar cooler and fixing of packing in the hole is connected copper-bar cooler, and water flowing;
5) to the sealing of being in the milk around the copper-bar cooler, furnace shell is carried out welded seal between cooling stick.
6) burn out cooling stave installation cooling stick number and determine that method is: the copper-bar cooler area is 1: 4 with the ratio of cooling stave area.
The inventive method courageously adopts body of heater grouting, installation copper-bar cooler and spraying to make the method that lining combines, can obviously improve the cooling performance of blast furnace cooling stave, thereby make the interior type of blast furnace work basicly stable, productive capacity obviously changes, the breakage that can delay cooling stave is repaiied the time with reducing in the blowing out, obtains good economic benefits.
Burn out back burning out on the cooling stave at cooling stave copper-bar cooler is installed, reach the identical cooling performance of cooling stave by damping down; Simultaneously, adopt cooling stave pickling technology to handle, improve cooling performance.
And, copper-bar cooler field engineering of the present invention, method is simple, is convenient to operation and control, and safe and reliable.
Embodiment
Maintaining method for blast furnace of the present invention, mainly comprise the high position of casing temperature (as positions such as furnace throat, shafts, specifically select according to using damaged degree) carry out body of heater grouting, copper-bar cooler is installed at the cooling wall breakage position, and the liner on shaft top sprayed make lining and combine.
Wherein, the mode of pressing-in grouting is taked in grouting, and high alumina matter refractory matter is pressed in the furnace shell.Take well to seal body of heater after this method, and prevent that furnace shell is rubescent, burst and burn.Described grouting adopts prior art to get final product.
Spraying is made lining and is made lining for behind empty stockline damping down the damaged position of shaft being sprayed.
The step that copper-bar cooler is installed: hollow out the corresponding furnace shell in cooling wall breakage position behind the damping down earlier, the condiment in the furnace shell is removed; The mode that combines with oxygen and aluminum strip is burnt and is hollowed out the position again, melts the residue that hollows out the position; Remove damaged position and cooling stave interior conduit on the cooling stave then; Utilize drilling machine to hole on cooling stave, the size in hole, shape, the degree of depth and copper-bar cooler match, and the number in hole is consistent with the radical that cooling stick is installed; The copper-bar cooler of packing in the hole of accomplishing fluently then is also fixing, and copper-bar cooler valve orchid is weldingly connected and water flowing with furnace shell; To the sealing of being in the milk around the copper-bar cooler, furnace shell is carried out welded seal at last.The installation radical of copper-bar cooler is determined according to the size of cooling stave.Experience is: the copper-bar cooler area is 1: 4 with the ratio of cooling stave area.Burn out on the cooling stave copper-bar cooler is installed after, can reach the cooling performance of former cooling stave.
Also can repair the liner of shaft top breakage, the mode of reparation is to adopt spraying to make the lining technology, and damaged position is sprayed, and this spraying is made the lining technology and can be adopted prior art to finish.In addition, also adopt the pickling technology that cooling stave is handled, to improve cooling performance.
Embodiment: certain blast furnace lining corroded serious in 2007, make the cooling stave heat flow rate per unit area heighten, polylith cooling stave water pipe is washed by coal gas and is worn, and No. 36,6 strings, No. 35,7 strings, No. 5,8 strings, the severe situation that No. 36 four cooling staves of 8 strings burn out in succession, blast furnace production is had a strong impact on, and technico-economical comparison declines to a great extent.Adopt the inventive method to implement technology such as furnace retaining such as reparations grade to the damaged position of above-mentioned blast furnace, the cooling stave burnout phenomenon is effectively suppressed, and 2007 are only and burn out one of cooling stave, and the blast-furnace technique economic target is significantly improved.The relevant furnace retaining technology of the present invention shows as:
1, blast furnace operating aspect: suitably control combustion intensity.Require this blast furnace in shifts integrated smelting intensity can not surpass 1.30t/m3.d (analysis of the above class of coke moisture content is as the criterion), with the heat flow rate per unit area of suitable reduction furnace wall.
Aspect charge composition, reach 3～4% and be advisable to go out in the slag TiO2, the slag dual alkalinity is by 1.13～1.18 controls.Improve stifled shale amount, guarantee the iron mouth degree of depth, this blast furnace requires to avoid checking to put iron greater than 1.8m as far as possible.
Reduce fetch water number of times and shortening of furnace roof as far as possible and fetch water the time, when throat temperature is high, resolute checking so that damping down handle, to safeguard the spraying bed of material.Cooling stave burns out continuously between iron mouth top, under the prerequisite that guarantees furnace condition anterograde, should suitably dwindle the tuyere diameter on Tie Kou both sides, suitably arrange in pairs or groups and use the lengthening straight air port of diameter as 120mm in 1#, 2#, 3#, 17#, 18# air port, forbid to adopt the skew wind mouth, to reach the purpose of suitable inhibition iron mouth direction edge coal gas stream.
The adjustment of blast furnace operating system will be the center with the stable smooth operation of the sufficient furnace temperature and the working of a furnace, and the pig iron [Si] 〉=0.45% is forbidden the low furnace temperature of [Si]≤0.3%.Suitably suppress edge coal gas stream,, avoid the slag crust activity frequently to cause the cooling stave thermal load to fluctuate widely to stablize the furnace wall slag crust.
2, blast-furnace body is safeguarded
Water coolant total amount＞3500t/h, regulate according to the cooling apparatus water temperature difference again, each cooling apparatus water temperature difference strictness is undertaken by 1200m3 blast furnace operating rules, 1～4 string, 0.5～2 ℃ (iron mouth :≤1 ℃), 5 a strings～beam type water tank, 2～10 ℃, the air port :≤4 ℃ in big, two covers, little cover≤10 ℃, cinder notch: big, two, three, quadruplet≤3 ℃.
Strengthening the cooling system water temperature difference detects.As find that water temperature difference surpasses required value, in time do to increase corresponding disposal such as the water yield.Strengthen cooling system and patrol and examine work, emphasis is: the cooling stave water outlet has or not and reduces and cut off the water supply, and notes abnormalities in time to notify the section chief and take to handle as correlation methods such as checkings.Strengthen each section casing temperature and detect, the position high to temperature performs record, and makes important mornitoring, so that utilize the regular grouting treatment of servicing machine meeting.
The cooling stave conduit has or not to come the water phenomenon, comes the conduit of water to have or not development, and whether conduit, bolt leak coal gas serious.Carry out spraying regularly according to the sprayed coating working condition.
After adopting this method that this blast furnace is carried out the integral body reparation, handle front and back relatively by strengthening the furnace retaining measure, the average daily output of this blast furnace is brought up to 2916t/d from 2815t/d, and ton ferropexy expense is by 67 yuan of calculating, and the year economic benefit of volume increase is 2,470,000 yuan; The comprehensive grade of stove of going at blast furnace becomes under 55.07% the unfavourable condition from 56.18%, goes into the stove comprehensive coke ratio and is 524kg/t.Fe, improves 1% by grade, coke ratio reduces by 2% and calculates, this blast furnace is produced iron per year by 1,020,000 tons of calculating, and coke is by 870 yuan of/ton calculating, and then burnt benefit is 1,032 ten thousand yuan the Spring Festival holidays.Year spraying and other expense are by 3,000,000 yuan of calculating.Total benefit calculates by 50%, and then the direct economic benefit in 1 year is 4,890,000 yuan.
After the invention process, furnace processor improves and coke ratio descends, and helps improving the business economic benefit, helps increasing income of non-agricultural workers, and ratio of putting coke into furnace descends and can reduce the coke consumption simultaneously, consumes coke less and both can economize on resources, and can reduce the pollution to environment again.
Claims (3)
1, a kind of maintaining method for blast furnace is characterized in that taking body of heater grouting is carried out at the high position of casing temperature, and copper-bar cooler is installed at the cooling wall breakage position, and the lining of shaft position that comes off is sprayed and makes the lining way of combining; Wherein, the mode of pressing-in grouting is taked in grouting, and high alumina matter refractory matter is pressed in the furnace shell; Spraying is made lining and is made lining for behind empty stockline damping down the damaged position of shaft being sprayed.
2, maintaining method for blast furnace according to claim 1 is characterized in that described step to cooling wall breakage position installation copper-bar cooler is:
1) water-cooled tube of removing damaged cooling wall;
2) hollow out the corresponding furnace shell in cooling wall breakage position;
The hole of 3) on cooling stave, opening, the size and the shape of the size in hole and shape and copper-bar cooler match;
4) copper-bar cooler and fixing of packing in the hole is connected copper-bar cooler, and water flowing;
5) to the sealing of being in the milk around the copper-bar cooler, furnace shell is carried out welded seal between cooling stick;
6) burn out cooling stave installation cooling stick number and determine that method is: the copper-bar cooler area is 1: 4 with the ratio of cooling stave area.
3, maintaining method for blast furnace according to claim 1, it is characterized in that cooling stave burns out after, must not change cooling stave, but on the cooling stave that burns out, cooling stick is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810069461A CN100595284C (en) | 2008-03-12 | 2008-03-12 | Maintaining method for blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810069461A CN100595284C (en) | 2008-03-12 | 2008-03-12 | Maintaining method for blast furnace |
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| CN101250598A true CN101250598A (en) | 2008-08-27 |
| CN100595284C CN100595284C (en) | 2010-03-24 |
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| CN200810069461A Expired - Fee Related CN100595284C (en) | 2008-03-12 | 2008-03-12 | Maintaining method for blast furnace |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102134620A (en) * | 2010-10-19 | 2011-07-27 | 新兴铸管股份有限公司 | Blast furnace shaft upper part rapid hot wet method for producing lining |
| CN104152618A (en) * | 2014-08-07 | 2014-11-19 | 山西太钢不锈钢股份有限公司 | Soft-water cooling pipeline control method for blast furnace |
| CN105586457A (en) * | 2016-03-16 | 2016-05-18 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Partial furnace casing cooling wall damage repairing method suitable for late campaign of blast furnace |
| CN106676216A (en) * | 2017-01-09 | 2017-05-17 | 中冶赛迪上海工程技术有限公司 | Method for maintaining industrial furnace cooling wall |
| CN109082491A (en) * | 2018-10-09 | 2018-12-25 | 鞍钢股份有限公司 | A kind of method of blast furnace crucibe, furnace bottom integrated maintenance |
| CN109182630A (en) * | 2018-11-13 | 2019-01-11 | 四川德胜集团钒钛有限公司 | The restorative procedure of damaged cooling wall of blast furnace |
| CN113088592A (en) * | 2021-04-08 | 2021-07-09 | 包头市安德窑炉科技有限公司 | Online grouting process for cold and hot surfaces of blast furnace |
| CN113260716A (en) * | 2018-12-13 | 2021-08-13 | 保罗沃思公司 | Method for protecting the inner wall of a shaft furnace |
-
2008
- 2008-03-12 CN CN200810069461A patent/CN100595284C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102134620A (en) * | 2010-10-19 | 2011-07-27 | 新兴铸管股份有限公司 | Blast furnace shaft upper part rapid hot wet method for producing lining |
| CN104152618A (en) * | 2014-08-07 | 2014-11-19 | 山西太钢不锈钢股份有限公司 | Soft-water cooling pipeline control method for blast furnace |
| CN105586457A (en) * | 2016-03-16 | 2016-05-18 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Partial furnace casing cooling wall damage repairing method suitable for late campaign of blast furnace |
| CN105586457B (en) * | 2016-03-16 | 2017-07-28 | 甘肃酒钢集团宏兴钢铁股份有限公司 | It is a kind of to use as a servant the method that later stage local stove skin cooling wall breakage is repaired suitable for State of Blast Furnace |
| CN106676216A (en) * | 2017-01-09 | 2017-05-17 | 中冶赛迪上海工程技术有限公司 | Method for maintaining industrial furnace cooling wall |
| CN106676216B (en) * | 2017-01-09 | 2018-10-30 | 中冶赛迪上海工程技术有限公司 | A method of for safeguarding industrial furnace cooling wall |
| CN109082491A (en) * | 2018-10-09 | 2018-12-25 | 鞍钢股份有限公司 | A kind of method of blast furnace crucibe, furnace bottom integrated maintenance |
| CN109182630A (en) * | 2018-11-13 | 2019-01-11 | 四川德胜集团钒钛有限公司 | The restorative procedure of damaged cooling wall of blast furnace |
| CN113260716A (en) * | 2018-12-13 | 2021-08-13 | 保罗沃思公司 | Method for protecting the inner wall of a shaft furnace |
| CN113088592A (en) * | 2021-04-08 | 2021-07-09 | 包头市安德窑炉科技有限公司 | Online grouting process for cold and hot surfaces of blast furnace |
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| Publication number | Publication date |
|---|---|
| CN100595284C (en) | 2010-03-24 |
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Granted publication date: 20100324 Termination date: 20140312 |