CN102827972B - Blast furnace spray-blow coal technology using semi-coke of iron works - Google Patents
Blast furnace spray-blow coal technology using semi-coke of iron works Download PDFInfo
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- CN102827972B CN102827972B CN201210324182.9A CN201210324182A CN102827972B CN 102827972 B CN102827972 B CN 102827972B CN 201210324182 A CN201210324182 A CN 201210324182A CN 102827972 B CN102827972 B CN 102827972B
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Abstract
The invention provides a blast furnace spray-blow coal technology using semi-coke of iron works. The technology comprises the following steps of: mixing semi-coke, anthracitic coal and bituminous coal based on a ratio; powdering the mixture in a mill, and carrying out spraying and blowing to a blast furnace for one time or multiple times through a blast furnace coal spraying system under a wind temperature of 1200 DEG C. With adoption of the technology, the semi-coke industrial application field can be further expanded; the industrial development can be sped up; the supply situation that the supply of the coking coal and the bituminous coal become tighter can be released through the semi-coke blast furnace spray-blow coal technology; and a benefit is provided to achieve the application and popularization of the coal carbonization technology; the bituminous coal can be replaced via the semi-coke, and the national current requirement on energy conservation and emission reduction can be met; and moreover, the economic benefit of the downstream enterprises can be obviously improved due to the low cost of the semi-coke.
Description
Technical field
The invention belongs to the recycle of production field of metallurgy resource comprehensive, be specifically related to a kind of pulverized coal injection into blast furna technique of utilizing blue charcoal.
Background technology
Pulverized coal injection in blast furnace can reach reduction coke ratio, improves the object of output, has good economic benefit.Within 2010, national Key Iron And Steel coal ejection ratio is 145kg/t, improves 10kg/t than last year, realizes national coal powder injection total amount more than 6,400 ten thousand t, and in February, 2011, domestic iron work seat Coal Injection Rate at BF reaches 179.5kg/t, created go into operation since best level.Along with China's rapid development of economy, coal price goes up year by year, causes the also corresponding increase of cost of pulverized coal injection, in order to reduce on the basis of coke ratio, reach the object reducing production costs, coal that price is lower is constantly sought as blast furnace blowing raw material by each Steel Plant.
Blue charcoal is that to take weak bonding or the dross coal of high volatile be raw material, through in low-temperature pyrolysis charing remove the semicoke product after the coal-tar middle oil material of coal and most of volatile, claim again semicoke.Because this product flame when burning is blue look, therefore claim blue charcoal.Along with the continuous progress of state of the art, blue charcoal refines blue charcoal from soil gradually and develops into machine-processed blue charcoal.The blue charcoal of soil refining because of its production technique simply backward, manual operation can only rely on the fire extinguishing of the empiric observation duration and degree of heating, quality can not be guaranteed, generally fixed carbon content, in 82% left and right, is wasted resource simultaneously, contaminate environment stops at the beginning of 21 century producing gradually.The blue charcoal of mechanism has adopted advanced destructive distillation sinter process, fixed carbon content has improved 5～10 percentage points than the blue charcoal of soil refining, and ash content and volatile matter have reduced by 3～5 percentage points, steady quality, moisture reduces, and physical strength also the blue charcoal of more native refining be significantly improved.
Although coal resources in China is very abundant, but it is also unbalanced to distribute, mostly concentrate on central and west regions, especially low volatile meager lean coal hard coal, big-and-middle-sized steel mill majority is distributed in eastern region, this just causes low-volatile coal portion's transportation eastwards from Midwest, cost is higher, it is the most western that Xinjiang is positioned at China, its blue charcoal Product transport need to consume a large amount of transportation cost to east iron and steel enterprise, and Jiuquan Iron & Steel Co. is nearer apart from Xinjiang with respect to other iron and steel enterprises, this makes wine steel select the blue charcoal in cheap Xinjiang to become possibility, add transportation cost, wine steel adopts blue charcoal also can not surpass 500 yuan/t as the price of showing up of blast furnace injection coal, far below the price that adopts other steam coal and blue charcoal, can save production cost greatly, create economic benefit.
Along with China's rapid development of economy, coal price goes up year by year, causes the also corresponding increase of cost of pulverized coal injection, in order to reduce on the basis of coke ratio, reach the object reducing production costs, coal that price is lower is constantly sought as blast furnace blowing raw material by each Steel Plant.Dragon steel iron work replaces part hard coal with the lower blue charcoal of price, seeks to reach the dual purpose that reduces iron-smelting fuel cost, widens ironmaking blowing coal resource.
Blue charcoal product has many purposes, as blast furnace blowing raw material, is wherein one of purposes compared with prospects.From sexual valence recently, the quality and performance of blue charcoal is better than hard coal and meager coal, meager lean coal; From resource, for the production of the high-quality of blue charcoal not agglutinating value(of coal) or weakly caking high-volatile bituminous coal resource far away more than can be used for the high-quality anthracite of blast furnace blowing and meager coal, meager lean coal.
Shaanxi Province's Yulin City is the blue charcoal production base of our province maximum, through new round structural adjustment, the blue charcoal industry in Yulin has realized garden layout, clustered is produced and recycle, but current industrial pattern more also rests on the gathering on enterprise space, " enterprise clusters " but not " industry cluster " not yet form relatively complete circulation industrial chain in garden; Coke-oven gas utilization also rests on simple fuel utilization, fail to extend downstream, industrial chain is shorter, added value is lower, blue charcoal product still be take as main in enterprise, and comprehensive benefit is not high, not yet step into " with Jiao base oneself upon, to change development " benign development track, cause thus blue charcoal energy consumption level and pollutant emission high, be faced with the immense pressure of energy-saving and emission-reduction.
The total industrial scale of current domestic blue charcoal approximately more than 5,000 ten thousand t, produce and mainly concentrate on the areas such as northern Shensi, Inner Mongol, Ningxia, Xinjiang.The application market of blue charcoal is also mainly in central and west regions, as northwest, southwest, Central Plains and other places, eastern region is because trucking costs is higher, the enterprise using is also relatively less, only have Danjiang River, Hubei electrification group, the minority enterprises such as the Zhejiang electrochemical group of huge energy, but it all only limits to experiment, the ratio that the spray of blue charcoal is added, performance etc., can not be in industrial application all without research.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of pulverized coal injection into blast furna technique of utilizing blue charcoal, with blue charcoal last reign of a dynasty for hard coal, strengthened the dynamics of utilizing at blue charcoal end, actively extend industrial chain, improved blue charcoal industry comprehensive benefit, accelerated blue charcoal technical equipment sizing, promote industrialization level, become the mission critical that promotes the Sustainable development of blue charcoal industry.
To achieve these goals, the technical solution used in the present invention is:
Iron work utilizes the pulverized coal injection into blast furna technique of blue charcoal, blue charcoal, hard coal are mixed according to the ratio of mass ratio 20:10:70 with bituminous coal, in grinding machine after grinds under 1200 ℃ of conditions of wind-warm syndrome, utilize bf coal injection system to jet to blast furnace.
Another kind of scheme of the present invention, mixes with hard coal, bituminous coal blue charcoal according to the ratio of mass ratio 30:10:60, in grinding machine after grinds under 1200 ℃ of conditions of wind-warm syndrome, utilize bf coal injection system to jet to blast furnace.
Another kind of scheme of the present invention, mixes with hard coal, bituminous coal blue charcoal according to the ratio of mass ratio 20:10:70, in grinding machine after grinds under 1200 ℃ of conditions of wind-warm syndrome, utilize bf coal injection system to jet first to blast furnace; Again blue charcoal is mixed according to the ratio of mass ratio 25:10:65 with hard coal, bituminous coal, in grinding machine after grinds under 1200 ℃ of conditions of wind-warm syndrome, utilize bf coal injection system to carry out secondary winding-up to blast furnace; Finally blue charcoal is mixed according to the ratio of mass ratio 30:10:60 with hard coal, bituminous coal, in grinding machine after grinds under 1200 ℃ of conditions of wind-warm syndrome, utilize bf coal injection system to carry out last winding-up to blast furnace; The total mass of three winding-ups is equal, and injection rate equates.
Described grinding machine is medium speed mill.
It is to be less than 180 orders to account for 85% powder that described blue charcoal is worn into particle diameter in grinding machine.
The explosivity of described blue charcoal is returned to the length of flame and is less than 150mm; Hardgrove grindability index (HGI) is greater than 56; Point of ignition is 380 ℃.
Compared with prior art, advantage of the present invention is:
(1) will further expand the industrial application of blue charcoal, be conducive to accelerate industry development;
(2) the supply situation that blue charcoal blast furnace blowing can be alleviated coking coal and be becoming tight hard coal day, is conducive to the application of dry distillation of coal technology;
(3) blue charcoal substitutes hard coal, meets the requirement of national current energy-saving and emission-reduction.Meanwhile, cheap blue charcoal price, will significantly promote the economic benefit of down-stream enterprise.
Embodiment
Below in conjunction with embodiment, the present invention is described in further details.
Embodiment mono-
Iron work utilizes the pulverized coal injection into blast furna technique of blue charcoal, blue charcoal, hard coal are mixed according to the ratio of mass ratio 20:10:70 with bituminous coal, in grinding machine after grinds under 1200 ℃ of conditions of wind-warm syndrome, utilize bf coal injection system to jet to blast furnace.
Embodiment bis-
Iron work utilizes the pulverized coal injection into blast furna technique of blue charcoal, blue charcoal is mixed according to the ratio of mass ratio 30:10:60 with hard coal, bituminous coal, in grinding machine after grinds under 1200 ℃ of conditions of wind-warm syndrome, utilize bf coal injection system to jet to blast furnace.
Embodiment tri-
Iron work utilizes the pulverized coal injection into blast furna technique of blue charcoal, and it is to be less than 180 orders to account for 85% powder that blue charcoal is worn into particle diameter in medium speed mill.Then the blue charcoal of milled is mixed according to the ratio of mass ratio 20:10:70 with hard coal, bituminous coal, in grinding machine after grinds under 1200 ℃ of conditions of wind-warm syndrome, utilize bf coal injection system to jet first to blast furnace; Again blue charcoal is mixed according to the ratio of mass ratio 25:10:65 with hard coal, bituminous coal, in grinding machine after grinds under 1200 ℃ of conditions of wind-warm syndrome, utilize bf coal injection system to carry out secondary winding-up to blast furnace; Finally blue charcoal is mixed according to the ratio of mass ratio 30:10:60 with hard coal, bituminous coal, in grinding machine after grinds under 1200 ℃ of conditions of wind-warm syndrome, utilize bf coal injection system to carry out last winding-up to blast furnace; The total mass of three winding-ups is equal, and injection rate equates.
In above three embodiment, the explosivity of described blue charcoal is returned to the length of flame and is less than 150mm; Hardgrove grindability index (HGI) is greater than 56; Point of ignition is 380 ℃.
Further the present invention program is carried out to analysis of experiments:
1. blast furnace injection coal index request is as table 1:
Table 1 coal suitable for blowing index request
2 coal sources are selected
The coal source that reaches coal suitable for blowing requirement is as table 2:
Table 2 coal source situation
Above foam coal, 3# cleaned coal, blue charcoal foam, blue carbon granule provide new available coal source coal for one, furnace charge, and wherein blue carbon granule needs fragmentation.
3. grindability index
From table 1 and table 2, the coal that imperial steel provides and the ash oontent of blue charcoal all meet coal suitable for blowing index request, and moisture content is all higher, so grindability index is generally lower, need improve by the method for coal blending.
4. explosivity
Bituminous coal and anthracitic volatile matter are lower, so explosivity is more weak, and the volatile content of high-volatile bituminous coal is larger, therefore have intense explosion.The fugitive constituent of blue charcoal is lower, so explosivity is also very weak.
5. point of ignition
High-volatile bituminous coal volatile content is larger, so its point of ignition is lower.
According to above analysis, comprehensive coal cost performance, can select the Coal Blending Schemes as table 3, supposes that there are four new stoves in certain steel mill, an old stove.Table 4 is for substituting coal dust mixed coal price afterwards with blue charcoal foam.
Table 3 Coal Blending Schemes
Table 4 substitutes coal dust mixed coal price afterwards with blue charcoal foam
Suppose 4,000,000 tons of certain steel mill's annual production, coal is than 150Kg/t iron, and a year consumption of coal is 600,000 tons, if after substituting 10% breeze blowing with blue foam, can save every year 296.4 ten thousand yuan.If after substituting 20% breeze blowing with blue foam, the expense that can save every year can be more.
Claims (1)
1. iron work utilizes the pulverized coal injection into blast furna technique of blue charcoal, it is characterized in that, blue charcoal is mixed according to the ratio of mass ratio 20:10:70 with hard coal, bituminous coal, in grinding machine after grinds under 1200 ℃ of conditions of wind-warm syndrome, utilize bf coal injection system to jet first to blast furnace; Again blue charcoal is mixed according to the ratio of mass ratio 25:10:65 with hard coal, bituminous coal, in grinding machine after grinds under 1200 ℃ of conditions of wind-warm syndrome, utilize bf coal injection system to carry out secondary winding-up to blast furnace; Finally blue charcoal is mixed according to the ratio of mass ratio 30:10:60 with hard coal, bituminous coal, in grinding machine after grinds under 1200 ℃ of conditions of wind-warm syndrome, utilize bf coal injection system to carry out last winding-up to blast furnace; The total mass of three winding-ups is equal, and injection rate is equal, and described grinding machine is medium speed mill, and it is to be less than 180 orders to account for 85% powder that described blue charcoal is worn into particle diameter in grinding machine, and the explosivity of described blue charcoal is returned to the length of flame and is less than 150mm; Hardgrove grindability index (HGI) is greater than 56; Point of ignition is 380 ℃.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103255247B (en) * | 2013-05-22 | 2015-08-26 | 南京钢铁股份有限公司 | A kind of blast furnace injection coal blending method |
| CN104212508B (en) * | 2014-09-28 | 2016-05-18 | 四川德胜集团钒钛有限公司 | A kind of blast furnace blowing fuel combination and blowing method thereof |
| CN105603180A (en) * | 2016-01-28 | 2016-05-25 | 西安建筑科技大学 | Method for producing sinter at low cost |
| CN106011340B (en) * | 2016-08-08 | 2018-10-30 | 四川德胜集团钒钛有限公司 | A kind of coal blending component of pulverized coal injection into blast furna |
| CN107574274A (en) * | 2017-09-29 | 2018-01-12 | 四川德胜集团钒钛有限公司 | A kind of blowing method of mixed fuel for blast furnace injection |
| CN108531674A (en) * | 2018-05-04 | 2018-09-14 | 包头市国卉能源科技有限责任公司 | The method for preparing pulverized coal injection in blast furnace as blast furnace blowing raw material using semi-coke |
| CN112063781A (en) * | 2019-06-10 | 2020-12-11 | 上海梅山钢铁股份有限公司 | Coke powder-containing mixed fuel for blast furnace coal injection and preparation method thereof |
| CN111961772A (en) * | 2020-08-19 | 2020-11-20 | 付光临 | Preparation method and application of modified semi coke |
| CN114106900A (en) * | 2020-08-28 | 2022-03-01 | 上海梅山钢铁股份有限公司 | Semi-coke-containing mixed fuel for blast furnace injection and preparation method thereof |
| CN112143841A (en) * | 2020-09-21 | 2020-12-29 | 西安建筑科技大学 | System and method for blast furnace mixed blowing of semi coke |
| CN114507553A (en) * | 2020-11-17 | 2022-05-17 | 上海梅山钢铁股份有限公司 | Mixed fuel with high coal-coke replacement ratio for blast furnace injection and preparation method thereof |
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