CN1269971C - Method for optimizing poor coal for blast furnace injection - Google Patents
Method for optimizing poor coal for blast furnace injection Download PDFInfo
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- CN1269971C CN1269971C CN 200410030866 CN200410030866A CN1269971C CN 1269971 C CN1269971 C CN 1269971C CN 200410030866 CN200410030866 CN 200410030866 CN 200410030866 A CN200410030866 A CN 200410030866A CN 1269971 C CN1269971 C CN 1269971C
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- coal
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- meager lean
- meager
- blowing
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- 239000003245 coal Substances 0.000 title claims abstract description 159
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000002347 injection Methods 0.000 title claims description 32
- 239000007924 injection Substances 0.000 title claims description 32
- 238000007664 blowing Methods 0.000 claims abstract description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 8
- 239000001301 oxygen Substances 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 17
- 239000002817 coal dust Substances 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 10
- 238000004458 analytical method Methods 0.000 claims description 6
- 238000011160 research Methods 0.000 claims description 6
- 239000005864 Sulphur Substances 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000005188 flotation Methods 0.000 claims description 4
- 238000005457 optimization Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 abstract description 2
- 239000011593 sulfur Substances 0.000 abstract description 2
- 239000000843 powder Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000000571 coke Substances 0.000 description 8
- 230000008901 benefit Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000004939 coking Methods 0.000 description 3
- 239000002802 bituminous coal Substances 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- NJFMNPFATSYWHB-UHFFFAOYSA-N ac1l9hgr Chemical compound [Fe].[Fe] NJFMNPFATSYWHB-UHFFFAOYSA-N 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009838 combustion analysis Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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- Manufacture Of Iron (AREA)
Abstract
The present invention provides a method for optimally treating blast furnace blowing meager lean coal, which aims at the requirement of blast furnace blowing coal, the meager lean coal is used as an object to analyze the blowing performance, the conveying performance, the combustion performance and the rational grain diameter of the meager lean coal, the conveying performance and the rational grain diameter of the meager lean coal are determined, the characteristics of conventional combustion and oxygen-enriched combustion of the meager lean coal are mastered, and a treatment method for increasing the blowing quantity and the combustion rate of the meager lean coal is provided. Raw coal of the meager lean coal adopts a typical jigging-floatation combined method. When the coal quality and the blowing performance of the treated meager lean coal achieve the indexes of: 9% to 12% of ash, 0.3% to 0.5% of total sulfur content, 75% to 87% of fixed carbon content, 27 MJ/kg to 30 MJ/kg of low calorific value, 10% to 17% of volatile component and 15mm to 40mm of explosivity, the meager lean coal satisfies the standard of the national blast furnace blowing coal, and can be directly used as coal powder of the blast furnace blowing coal.
Description
Technical field
Deep process technology field in the invention belongs to coal processing and fully utilizing, a kind of method to the meager lean coal optimization process particularly is provided, make it to be used for blast furnace blowing, thereby rationally utilize and give full play to China's meager coal, meager lean coal resource, promote the development of pulverized coal injection, improve the economic benefit of coal enterprise and iron and steel enterprise.
Background technology
China is that the first in the world is produced iron big country, and output of steel has been broken through 200,000,000 tons.But coke resource is very short, goes into the oven coke price and breaks through 1000 yuan/ton, contains the tax coke and reaches about 1200 yuan/ton, has become the strategic issue of restriction China ironmaking development.Pulverized coal injection in blast furnace is from the blast-furnace tuyere coal dust that directly winding-up is levigate in stove, works to provide heat and reductive agent to substitute coke, thereby reduces coke ratio, increases blast furnace iron output, reduces pig iron cost, reduces the coke oven investment and reduces coking and pollute.The injecting coal quantity of making great efforts the raising blast furnace has become the critical path of domestic blast furnace survival and development, and the blast furnace injection coal demand increases extremely rapid.National injecting coal quantity was 5,020,000 tons in 1996, then reached 1,800 ten thousand tons in 2003.So huge injecting coal quantity makes pulverized coal injection coal source instability, ature of coal can not get having guaranteed into unprecedented new problem, and has become the bottleneck that restriction further improves the pulverized coal injection amount, increases economic efficiency!
Generally all to adopt the fine hard coal be main to the blast furnace injection coal of Iron and Steel Enterprises in China now, but shortcomings such as anthracite ignition temperature height, incendivity is poor, rate of combustion is low, and the domestic hard coal reserves of China are few, supply falls short of demand for hard coal, the hard coal price continues to raise, can not satisfy the needs of furnace coal spraying technology and realistic development.Meager coal, meager lean coal are the coals between hard coal and high-volatile bituminous coal between fugitive constituent, occupy an important position in coal resources in China.Meager coal, meager lean coal have following advantage: do not have the coking ring substantially, volatile matter is slightly higher than hard coal, incendivity and reactive than characteristics such as hard coal are good, with regard to general injection technology, fine meager coal, meager lean coal coal can be used as the winding-up coal, improve its combustionproperty, improve rate of combustion, can also be very big limit ground improve substitution rate, be very beneficial for improving injecting coal quantity, reduce coke ratio and to the comprehensive utilization of coal resources.And the reserves of meager lean coal are very abundant, resource distribution is wider, and price is low; Near apart from Steel Plant, freight charges are low, reduce ironmaking cost.
But,, up to now, mostly concentrate on both at home and abroad coals such as the bituminous coal of medium volatile matter and high volatile and hard coal at the research of pulverized coal injection kind at the requirement of pulverized coal injection to ature of coal.Systematic research work to the jetting performance of meager coal, meager lean coal reports that rarely especially the data of the system of aspect blast furnace blowings such as jetting performance, oxygen-enriched combusting performance, transportation performance, winding-up particle diameter almost are in the barren state.
Summary of the invention
The objective of the invention is to: a kind of method to the meager lean coal optimization process is provided, has made it to be used for blast furnace blowing.Requirement at blast furnace injection coal, with the meager lean coal is object, jetting performance, transportation performance, combustionproperty, reasonable particle diameter to meager lean coal are analyzed, and determine the transportation performance and the reasonable particle diameter of meager lean coal, grasp the routine burning of meager lean coal, the characteristics of oxygen-enriched combusting; Propose to improve the treatment process of meager lean coal winding-up amount and rate of combustion.
Treatment process of the present invention is as follows:
1, selecting the raw coal coal characteristic for use is that ash content is 15%～22%, total sulphur content is＜0.7%, fixed carbon content is between 70%～85%, net calorific value reaches 25MJ/kg～30MJ/kg, volatile matter is 10%～25%, explosivity is 30mm～60mm, and the grindability index coefficient is 70～95 the meager lean coal coal source as the processing blast furnace injection coal.
2, the meager lean coal raw coal is adopted typical jigging one flotation combined method, be limited to 50mm on the feed coal particle diameter, major equipment is heavily Jie inclined lifting wheel separator of groove width B3.2m, 10m
2～28m
2+ 13mm jig and 4m
3～14m
3Flotation machine.Raw coal is through going out 3 kinds of products after the jig washing: spoil, middle coal and cleaned coal (ash content is 9%～13%), and select for use the cleaned coal after the washing further to be processed into blast furnace injection coal.
3, the meager lean coal cleaned coal is adopted the analyze and research pattern of its coal dust of infrared thermal imagery analysis and micropetrological unit, understand flowing and transportation performance of coal dust, and carry out routine burning, oxygen-enriched combusting test, determine particle diameter that meager lean coal is processed into blast furnace injection coal be 75 μ m following account for 70～85%, wherein particle diameter accounts for 60～75% less than 50 μ m, coal dust pattern rule, winding-up is effective when being used for blast furnace blowing.
4, adopt the formula pulverizer that hangs down at first coal to be crushed to the Bed for Fine Coal of particle diameter＜6mm, select for use XMQ-Φ 460 * 600 ball mills that Bed for Fine Coal is ground, sieved then, the granularity of processing back coal dust satisfies the requirement of the particle size range of the 3rd blast furnace injection coal that goes on foot, and has just made pulverized coal injection in blast furnace.
Ature of coal and the every index of jetting performance through the meager lean coal after the above processing treatment are: ash content is 9%～12%, total sulphur content is 0.3%～0.5%, fixed carbon content is 75%～87%, net calorific value reaches 27MJ/kg～30MJ/kg, volatile matter is 10%～17%, when explosivity is 15mm～40mm, all satisfy national blast furnace injection coal standard, can be directly as the blast furnace injection coal coal dust.
Advantage of the present invention:
(1), systematically studied the ature of coal feature and the jetting performance of meager lean coal, for the exploitation meager lean coal has been laid technical foundation as blast furnace injection coal coal source at the requirement of pulverized coal injection to ature of coal.
(2) method that adopts microstructure and morphology analysis to combine with the conveying test, determine the reasonable particle diameter and the transportation performance of meager lean coal, the foundation of having showed reasonable particle diameter and transportation performance from the mechanism aspect, not only lay a good foundation, and opened up the approach of research reasonable particle diameter of coal injection and transportation performance for industrial application.
(3) adopt advanced meanses such as infrared thermal imagery analysis and micropetrological unit combustion analysis, systematically study the combustionproperty of meager lean coal from routine burning, oxygen-enriched combusting to commerical test at the blast furnace blowing characteristics comprehensively, filled up the blank on meager lean coal burning and the oxygen-enriched combusting performance perameter.
In sum, the present invention rationally utilizes the meager lean coal resource for China, stablize coal suitable for blowing coal source, promote the development of furnace coal spraying technology, save ironmaking cost, investment of minimizing coke oven and minimizing coking all are significant to the pollution of environment, bring huge social benefit and economic benefit for coal enterprise and iron and steel enterprise.
Embodiment
1, coal source: the meager lean coal of selecting for use Shanxi the Lushui River peace Mining Group to produce
Table 1 the Lushui River peace meager lean coal raw coal ature of coal
| Fixed carbon (%) | Net calorific value (MJ/kg) | Volatile matter (%) | Explosive (mm) | Ash content (%) | Sulphur content (%) | The grindability index coefficient |
| 75～79 | 28～29 | 13～18 | 20～40 | 18～21 | 0.30～0.45 | 86～91 |
2, the Lushui River peace meager lean coal is through after the washing, its cleaned coal is adopted infrared thermal imagery analysis and micropetrological unit analysis and research and conventional burning, oxygen-enriched combusting test, determine that the optimum grain-diameter scope that the Lushui River peace meager lean coal is processed into blast furnace injection coal is that 75 μ m account for 70～80%, particle diameter is that 50 μ m accounted for 65～75% o'clock, coal dust pattern rule, winding-up is effective when being used for blast furnace blowing.Hang down the formula pulverizer to coal dust broken and with XMQ-Φ 460 * 600 ball mills to coal grinding, screening after, the granularity of processing back coal dust satisfies the requirement that the blast furnace blowing the Lushui River is pacified the optimum grain-diameter scope of meager lean coal.
3, the ature of coal situation of the Lushui River peace blast furnace blowing meager lean coal after the above method processing treatment of employing
The coal index of the Lushui River peace blast furnace blowing meager lean coal after table 2 is handled
| Project | Country's pulverized coal injection into blast furna standard | The coal index of the Lushui River peace blast furnace blowing meager lean coal after the processing |
| Ash content | A d＜8.0%～13.5% (superfine＜8.0%) | 9％～11％ |
| Net calorific value | ＞24.25MJ/kg | 28MJ/kg～31MJ/kg |
| Sulfur | Low more good more,＜1.0% | 0.22％～0.29％ |
| Fixed carbon | ＞76.8％ | 76.8％～81％ |
| Explosive | ＜50mm | 10mm～30mm |
| Volatile matter | Generally be no more than 20% | 12％～16％ |
From as can be seen top, the every index of the Lushui River peace blast furnace blowing meager lean coal ature of coal after treatment is better than national pulverized coal injection into blast furna standard, meets the requirement of blast furnace injection coal fully, can be directly used in blast furnace blowing.
4, implementation result:
Zhi Bei blast furnace blowing meager lean coal is tried out at sky iron iron work like this, and blast furnace blowing is obtained good effect.
Claims (1)
1, a kind of optimization process method that is used for the meager lean coal of blast furnace blowing is characterized in that: concrete treatment process is as follows:
A, to select the raw coal coal characteristic for use be that ash content is 15%～22%, total sulphur content is＜0.7%, fixed carbon content is between 70%～85%, net calorific value reaches 25MJ/kg～30MJ/kg, volatile matter is 10%～25%, explosivity is 30mm～60mm, and the grindability index coefficient is 70～95 the meager lean coal coal source as the processing blast furnace injection coal;
B, the meager lean coal raw coal is adopted jigging-flotation combined method, be limited to 50mm on the feed coal particle diameter, equipment is heavily Jie inclined lifting wheel separator of groove width B3.2m, 10m
2～28m
2+ 13mm jig and 4m
3～14m
3Flotation machine; Raw coal through the product after the jig washing is: spoil, middle coal and cleaned coal, and ash content is 9%～13% in the cleaned coal, selects for use the cleaned coal after the washing further to be processed into blast furnace injection coal;
C, the meager lean coal cleaned coal is adopted the analyze and research pattern of its coal dust of infrared thermal imagery analysis and micropetrological unit, understand flowing and transportation performance of coal dust, and carry out routine burning, oxygen-enriched combusting test, determine particle diameter that meager lean coal is processed into blast furnace injection coal be 75 μ m following account for 70～85%, wherein particle diameter accounts for 60～75% less than 50 μ m;
D, the vertical formula pulverizer of employing at first are crushed to the Bed for Fine Coal of particle diameter＜6mm to coal, select for use XMQ-Φ 460 * 600 ball mills that Bed for Fine Coal is ground, sieved then, pulverized coal injection in blast furnace has just been made in the requirement of the particle size range of the blast furnace injection coal in the satisfied c step of granularity of processing back coal dust;
The ature of coal and the every index of jetting performance of the meager lean coal after e, the above processing treatment of process are: ash content is 9%～12%, total sulphur content is 0.3%～0.5%, fixed carbon content is 75%～87%, net calorific value reaches 27MJ/kg～30MJ/kg, volatile matter is 10%～17%, when explosivity is 15mm～40mm, all satisfy national blast furnace injection coal standard, directly as the blast furnace injection coal coal dust.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410030866 CN1269971C (en) | 2004-04-09 | 2004-04-09 | Method for optimizing poor coal for blast furnace injection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410030866 CN1269971C (en) | 2004-04-09 | 2004-04-09 | Method for optimizing poor coal for blast furnace injection |
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| Publication Number | Publication Date |
|---|---|
| CN1680607A CN1680607A (en) | 2005-10-12 |
| CN1269971C true CN1269971C (en) | 2006-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410030866 Expired - Fee Related CN1269971C (en) | 2004-04-09 | 2004-04-09 | Method for optimizing poor coal for blast furnace injection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5958935B2 (en) * | 2012-08-13 | 2016-08-02 | 三菱重工業株式会社 | Pig iron manufacturing method and blast furnace equipment used therefor |
| CN116479195B (en) * | 2023-06-26 | 2023-09-05 | 山西潞安环保能源开发股份有限公司 | Method for optimizing blast furnace injection coal blending based on coal rock parameters |
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