CN104140836A - Coal blending and coking method with low-flow high-expansion low-shrinkage-degree coking coal involved - Google Patents
Coal blending and coking method with low-flow high-expansion low-shrinkage-degree coking coal involved Download PDFInfo
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- CN104140836A CN104140836A CN201410335606.0A CN201410335606A CN104140836A CN 104140836 A CN104140836 A CN 104140836A CN 201410335606 A CN201410335606 A CN 201410335606A CN 104140836 A CN104140836 A CN 104140836A
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Abstract
The invention discloses a coal blending and coking method with low-flow, high-expansion and low-shrinkage-degree coking coal involved. The method comprises the following steps that 1), the coal blending structure and the proportion are determined; 2), various types of single coking coal are dried, water in all types of the single coking coal is controlled to be 2.0-5.0%, and the bulk specific weight of the blended coal is 800 kg/m<3>-950 kg/m<3>; 3), the coking coal enters a coke oven, and coal blending and coking are carried out. According to the method, the low-flow, high-expansion and low-shrinkage-degree coking coal is used as fat coal, after the coal types and the proportion of other types of the single coking coal are selected and determined, the bulk specific weight of the blended coal is increased by reducing the amount of the water in all the single coking coal, and the defect that due to poor mobility, the low-flow, high-expansion and low-shrinkage-degree coking coal can not be combined with other coal easily and fully in the expanding process of the plastic mass can be overcome; the strength of the combination with other coking coal is improved remarkably, the thermal performance of coke is obviously improved, and the blending effect of the high-quality fat coal can be achieved.
Description
Technical field
The invention belongs to technical field of coal chemical industry, be specifically related to a kind of coal-blending coking method that low mobile high low shrink grading coking coal that expands participates in.
Background technology
In recent years, China Steel industry production capacity increases severely, high-quality caking coal demand is constantly increased, and China's high-quality caking coal resource shortage, domestic iron and steel enterprises has to, from a large amount of high bonding coking coal of overseas introduction, meet growing blast furnace demand.But in the introduction of Import Coal, find, many so-called " high-quality caking coals ", adapted effect and domestic high-quality caking coal differ greatly.
For example, a collection of Import Coal resource that certain company introduces, volatile matter 26～28%, turgidity b value >150%, G value 90～100, Y value 22～25mm, shrink grading X is 10～15mm only, maximum fluidity cannot be tested, according to GB, press coking coal adapted, but this coking coal ature of coal is special, its turgidity has reached rich coal turgidity value, press coking coal adapted, bubble is burnt high; Press the simple adapted of rich coal, because its plastic mass quantity is many and unusual thickness, once plastic mass expands, poor fluidity again, is combined not closely with other coking coal, cannot realize and the good compatibility coking of other coking coal, very easily form a large amount of bubbles burnt, cause the problems such as institute's coking charcoal is loose, and air vent wall is thin, and hole is large.Especially wet coal coking (be common process, conventional coking coal is not dried, and moisture controlled is 9.0%～10.5%), the low (600kg/m of bulk density
3～750kg/m
3), bonding force is more weak, and coal-blending coking result is poorer.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of coal-blending coking method that low mobile high low shrink grading coking coal that expands participates in, to solve maximum fluidity MF<200ddpm, turgidity b>150%, shrink grading X<20mm, G value >90, the coking coal of Y value 22～25mm is difficult to the technical problem of adapted.
For solving the problems of the technologies described above, technical scheme of the present invention comprises the steps:
1) determine Blending and ratio: single coal of planting comprises the low mobile high low shrink grading coking coal that expands, coking coal, 1/3 coking coal, gas-fat coal, lean coal, the maximum fluidity MF<200ddpm of the described low mobile high low shrink grading coking coal that expands, turgidity b>150%, shrink grading X<20mm, G value >90, Y value 22～25mm, the G value of coking coal is 80～85, coking coarse grain pattern structure >=50%, the volatile matter <34% of described 1/3 coking coal, G value >=80; Each single coal of planting is by weight percentage: the high low mobile coking coal of low shrink grading that expands: 15～20%, and coking coal: 35～45%, 1/3 coking coal: 25～40%, gas-fat coal: 5-10%, lean coal 10～15%;
2) each single coking coal of planting is dried, making each single moisture controlled of planting coking coal is 2.0～5.0%, and to make the bulk density of mixed coal be 800kg/m
3～950kg/m
3;
3) enter coke oven, coal-blending coking after pulverizing by routine.
Further, above-mentioned steps 2) in, each single coal of planting is by weight percentage: the high low mobile coking coal of low shrink grading that expands: 15～20%, and coking coal: 35～40%, 1/3 coking coal: 25～30%, gas-fat coal: 5-10%, lean coal 10～15%.
The present invention is using the low mobile high low shrink grading coking coal that expands as rich coal adapted, at definite other each list of selection, plant after the coal and ratio of coking coal, by reducing each single moisture of planting coking coal, increase the bulk density of mixed coal, effectively overcome low mobile high expand low shrink grading coking coal when plastic mass expands because of poor fluidity, be difficult for and the well-bound defect of other coal, be significantly improved with the bonding strength of other coking coal, Thermal Properties of Coke improves obviously, has reached the adapted effect of high-quality rich coal.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed explanation.
The coal-blending coking method that the low mobile high low shrink grading coking coal that expands of the present invention participates in, comprises the steps:
1) determine Blending and ratio: single coal of planting comprises the low mobile high low shrink grading coking coal that expands, coking coal, 1/3 coking coal, gas-fat coal, lean coal, the maximum fluidity MF<200ddpm of the described low mobile high low shrink grading coking coal that expands, turgidity b>150%, shrink grading X<20mm, G value >90, Y value 22～25mm, the G value of coking coal is 80～85, coking coarse grain pattern structure >=50%, the volatile matter <34% of described 1/3 coking coal, G value >=80; Each single coal of planting is by weight percentage: the high low mobile coking coal of low shrink grading that expands: 15～20%, and coking coal: 35～45%, 1/3 coking coal: 25～40%, gas-fat coal: 5-10%, lean coal 10～15%;
2) each single coking coal of planting is dried, making each single moisture controlled of planting coking coal is 2.0～5.0%, and to make the bulk density of mixed coal be 800kg/m
3～950kg/m
3;
3) enter coke oven, coal-blending coking after pulverizing (being that grinding particle size is below 3mm) by routine.
Aforesaid method step 3) in, grinding particle size is below 3mm, and after referring to that coking coal is pulverized, granularity is below 3mm, and wherein the coal grain of 2～3mm accounts for 30～40% of the whole coal samples of this coking coal.
According to dry coal coking and above-mentioned Coal Blending Schemes method, do not having under the condition of moulded coal, selectivity disintegrating process, coking on more than 6 meters cokerys, its Indexes on Coke Strength can reach: shatter strength M40 is greater than 84%, abrasive wear resistance M10 is less than 7.0%, reactive (CRI) is less than 28%, and post-reaction strength (CSR) is greater than 64%.
The low mobile high coal analysis that expands low shrink grading coking coal in following specific embodiment the results are shown in Table 1.
Table 1 coal analysis result
Other each the single coal ature of coal coal analysis of planting that participates in coal-blending coking the results are shown in Table 2.
The single coal coal coal analysis result of planting of table 2
| Coal sample | V daf/％ | G | Y/mm | Rmax/％ | MF/ddpm | b/％ | X/mm |
| Gas-fat coal | 41.23 | 98 | 28 | 0.68 | 45000 | 150 | 30 |
| 1/3 coking coal | 32.45 | 86 | 18 | 0.97 | - | - | - |
| Rich coal | 31.05 | 98 | 26 | 0.95 | 25000 | 180 | 28 |
| Coking coal | 24.56 | 80 | 16 | 1.25 | - | - | - |
| Lean coal | 17.05 | 38 | 4 | 1.69 | - | - | - |
Embodiment 1
In the present embodiment, gas-fat coal: 5%; The low mobile high low shrink grading coking coal that expands: 15%; 1/3 coking coal: 30%; Coking coal: 35%; Lean coal: 15%.
Each single kind coking coal moisture is 10%, and directly the mixed coal bulk density of coal blending is 700kg/m
3, according to the CSR of above-mentioned Coal Blending Schemes coking gained coke, be 62%.
Each single coking coal of planting is dried, and moisture controlled is 5%, and the bulk density of mixed coal rises to 800kg/m
3.After raising bulk density, the CSR of coking gained coke is 65.5%.
That is: do not having under the condition of moulded coal, selectivity disintegrating process, coking on more than 6 meters cokerys, the inventive method coal-blending coking gained coke, intensity index can reach: shatter strength M40 reaches 86%, abrasive wear resistance M10 reaches 6.5%, reactive (CRI) 26%, post-reaction strength (CSR) 65.5%, before improving compared with bulk density, CSR improves 3.5%.
Embodiment 2
In the present embodiment, gas-fat coal 8%; The low mobile high low shrink grading coking coal that expands: 18%; 1/3 coking coal: 25%; Coking coal: 35%; Lean coal: 14%.
Each single coking coal of planting is dried, and moisture is 9.6%, and directly the mixed coal bulk density of coal blending is 720kg/m
3, according to the CSR of above-mentioned Coal Blending Schemes coking gained coke, be 61.2%.
Each single coking coal of planting is dried, and moisture controlled is 4.0%, and the bulk density of mixed coal is 850kg/m
3.After raising bulk density, the CSR of coking gained coke is 65.3%.
That is: do not having under the condition of moulded coal, selectivity disintegrating process, coking on more than 6 meters cokerys, the inventive method coal-blending coking gained coke, intensity index can reach: shatter strength M40 reaches 87%, abrasive wear resistance M10 reaches 6.3%, reactive (CRI) 25.8%, post-reaction strength (CSR) 65.3%, before improving compared with bulk density, CSR improves 4.1%.
Embodiment 3
In the present embodiment, gas-fat coal 10%; The low mobile high low shrink grading coking coal that expands: 20%; 1/3 coking coal: 25%; Coking coal: 35%; Lean coal: 10%.
Each single coking coal of planting is dried, and moisture is 10.2%, and directly the mixed coal bulk density of coal blending is 680kg/m
3, according to the CSR of above-mentioned Coal Blending Schemes coking gained coke, be 61.4%.
Each single coking coal of planting is dried, and moisture controlled is 2.5%, and the bulk density of mixed coal is 900kg/m
3.After raising bulk density, the CSR of coking gained coke is 66.4%.
That is: do not having under the condition of moulded coal, selectivity disintegrating process, coking on more than 6 meters cokerys, the inventive method coal-blending coking gained coke, intensity index can reach: shatter strength M40 reaches 87%, abrasive wear resistance M10 reaches 6.2%, reactive (CRI) 25.4%, post-reaction strength (CSR) 66.3%, before improving compared with bulk density, CSR has improved 5%.
Comparative example 1
Comparative example 1 is compared with embodiment 1, difference is only that comparative example 1 used high mobile rich coal (being that rich coal degree of mobilization is 25000ddpm) to substitute the low mobile high low shrink grading coking coal that expands in embodiment 1, each single dry front moisture 10% of coking coal of planting, the bulk density of mixed coal is 700kg/m
3, according to the CSR of above-mentioned Coal Blending Schemes coking gained coke, be 64%.Each single coking coal of planting is dried, and moisture controlled is 5%, and the bulk density of mixed coal rises to 800kg/m
3.After raising bulk density, the CSR of coking gained coke is 64.6%.By improving bulk density method, its coke CSR only improves 0.6%.
Comparative example 2
Comparative example 2 is compared with embodiment 2, and difference is only that comparative example 2 used high mobile rich coal (being that rich coal degree of mobilization is 25000ddpm) to substitute the low mobile high low shrink grading coking coal that expands in embodiment 2,
Moisture when each single kind coking coal is dried is 9.6%, and the bulk density of mixed coal is 720kg/m
3, according to the CSR of above-mentioned Coal Blending Schemes coking gained coke, be 64.2%.
Each single coking coal of planting is dried, and moisture controlled is 3.0%, and the bulk density of mixed coal is 880kg/m
3.After raising bulk density, the CSR of coking gained coke is 65.5%.By improving bulk density method, its coke CSR only improves 1.3%.
Claims (2)
1. the coal-blending coking method that the low mobile high low shrink grading coking coal that expands participates in, is characterized in that: the method comprises the steps:
1) determine Blending and ratio: single coal of planting comprises the low mobile high low shrink grading coking coal that expands, coking coal, 1/3 coking coal, gas-fat coal, lean coal, the maximum fluidity MF<200ddpm of the described low mobile high low shrink grading coking coal that expands, turgidity b>150%, shrink grading X<20mm, G value >90, Y value 22～25mm, the G value of coking coal is 80～85, coking coarse grain pattern structure >=50%, the volatile matter <34% of described 1/3 coking coal, G value >=80; Each single coal of planting is by weight percentage: the high low mobile coking coal of low shrink grading that expands: 15～20%, and coking coal: 35～45%, 1/3 coking coal: 25～40%, gas-fat coal: 5-10%, lean coal 10～15%;
2) each single coking coal of planting is dried, making each single moisture controlled of planting coking coal is 2.0～5.0%, and to make the bulk density of mixed coal be 800kg/m
3～950kg/m
3;
3) enter coke oven, coal-blending coking.
2. the coal-blending coking method that the low mobile high low shrink grading coking coal that expands according to claim 1 participates in, it is characterized in that: described step 2), each single coal of planting is by weight percentage: the high low mobile coking coal of low shrink grading that expands: 15～20%, coking coal: 35～40%, 1/3 coking coal: 25～30%, gas-fat coal: 5-10%, lean coal 10～15%.
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| CN107216901A (en) * | 2017-07-14 | 2017-09-29 | 武汉钢铁有限公司 | The as-fired coal dilation control method of binder free typed briquette class |
| CN115044386A (en) * | 2022-07-18 | 2022-09-13 | 河北中煤旭阳能源有限公司 | Top-loading coking coal blending coking method for fully blending imported coal, product thereof and blended coal for coking |
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| CN115044386A (en) * | 2022-07-18 | 2022-09-13 | 河北中煤旭阳能源有限公司 | Top-loading coking coal blending coking method for fully blending imported coal, product thereof and blended coal for coking |
| CN115044386B (en) * | 2022-07-18 | 2023-05-12 | 河北中煤旭阳能源有限公司 | Top-loading coal blending coking method for fully blending imported coal, product thereof and blended coal for coking |
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Effective date of registration: 20170721 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |