CN104140835B - The coal-blending coking method that the low flowing coking coal of high expansion lower shrinkage degree participates in - Google Patents
The coal-blending coking method that the low flowing coking coal of high expansion lower shrinkage degree participates in Download PDFInfo
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Abstract
The invention discloses the coal-blending coking method that the low flowing coking coal of a kind of high expansion lower shrinkage degree participates in, comprise the steps: 1) pre-treatment of high expansion lower shrinkage degree low flowing coking coal: lower shrinkage degree low flowing coking coal precomminution of being expanded by height is to different grain size, by the shrink grading of Y value testing method test different grain size coking coal, the granularity that wherein shrink grading is maximum, is defined as reasonable grinding particle size; The height expansion lower shrinkage degree low flowing coking coal participating in coal blending is the coking coal of reasonable grinding particle size; 2) Blending and ratio is determined; 3), after pulverizing according to a conventional method after being mixed by each single grade coal, stove coking is entered.The present invention is crushed to reasonable granularity and as rich coal adapted, it can be impelled to contact with different coking coal more fully, and eliminate the degradation effects that its lower shrinkage brings preferably, coke quality is comparatively improved significantly through the low flowing coking coal of lower shrinkage degree that to be expanded by height.
Description
Technical field
The invention belongs to technical field of coal chemical industry, be specifically related to the coal-blending coking method that the low flowing coking coal of a kind of high expansion lower shrinkage degree participates in.
Background technology
In recent years, iron and steel enterprise generally feels that coking cost increases day by day, and high-quality caking coal resource is day by day deficient.Its reason is, on the one hand, objectively, coking coal resource is Nonrenewable resources, and along with the continuous increase consumed, total amount necessarily constantly reduces; On the other hand, subjective, still be confined to rely on the apparent indexs such as G value, Y value to high-quality caking coal decision method, many so-called " high-quality caking coal " resource judged according to existing method, because its plastic mass character is special, especially flow, expand, technological property that contraction etc. is special, do not have so-called high-quality effect at all, have a strong impact on the effect of adapted and the quality of institute's coking charcoal.Such as, a kind of volatilization is divided into 26 ~ 28%, turgidity b value >150%, G value 90 ~ 100, and the coking coal of Y value 22 ~ 25mm, shrink grading X only 10 ~ 15mm, its maximum fluidity, lower than 200ddpm, is judged to be coking coal according to GB.Contriver finds through long-term experimental study, and this coking coal ature of coal is special, although Y value is lower than 25mm, its turgidity has reached rich coal expansion angle value, if press coking coal adapted, bubble coke ratio example is high, coke quality deterioration; And press the simple adapted of rich coal, due to the many and unusual thickness of its plastic mass quantity, plastic mass is once expand, poor fluidity again, is combined with other coking coal not tight, cannot realizes the good compatibility coking with other coking coal, very easily form a large amount of bubbles burnt, institute's coking charcoal is caused to loosen, the problems such as air vent wall is thin, and hole is large.
Summary of the invention
Technical problem to be solved by this invention is to provide the coal-blending coking method that the low flowing coking coal of a kind of high expansion lower shrinkage degree participates in, to solve turgidity b>150%, shrink grading X<20mm, maximum fluidity MF<200ddpm, the coking coal of G value >90, 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) pre-treatment of high expansion lower shrinkage degree low flowing coking coal: lower shrinkage degree low flowing coking coal precomminution of being expanded by height is to different grain size, by the shrink grading of Y value testing method test different grain size coking coal, the granularity that wherein shrink grading is maximum, is defined as reasonable grinding particle size; Described high expansion lower shrinkage degree low flowing coking coal turgidity b>150%, shrink grading X<20mm, maximum fluidity MF<200ddpm, G value >90, Y value 22 ~ 25mm;
2) Blending and ratio is determined: single grade coal comprises the low flowing coking coal of high expansion lower shrinkage degree, coking coal, 1/3 coking coal, gas-fat coal, lean coal, the G value of described 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 grade coal is by weight percentage: the low flowing coking coal of high expansion lower shrinkage degree: 15 ~ 20%, coking coal: 35 ~ 45%, 1/3 coking coal: 25 ~ 40%, gas-fat coal: 0 ~ 10%, lean coal 10 ~ 15%; Wherein high expansion lower shrinkage degree low flowing coking coal is the coking coal of pre-treatment to reasonable grinding particle size, and other coking coals do not carry out precomminution process;
3), after pulverizing according to a conventional method after being mixed by each single grade coal, stove coking is entered.
Further, above-mentioned steps 2) in, each single grade coal is by weight percentage: the low flowing coking coal of high expansion lower shrinkage degree: 15 ~ 20%, coking coal: 35 ~ 40%, 1/3 coking coal: 25 ~ 30%, gas-fat coal: 5 ~ 10%, lean coal 10 ~ 15%.
The present inventor is through studying discovery for a long period of time, the low flowing coking coal of high expansion lower shrinkage degree reduces along with granularity, the thermal change behavior generation noticeable change of plastic mass, the thickness of plastic mass obtains increase, plastic mass convergent-divergent more acutely, and shrink grading is improved.Thermal change behavior is " violent behavior " by " gentleness " Behavioral change that original dilation is low, and impel it to contact with different coking coal more abundant, eliminate the degradation effects that its lower shrinkage brings preferably, coke quality is comparatively improved significantly.
Embodiment
Below in conjunction with embodiment, the present invention is described in more detail.
The coke making and coal blending method that the low flowing coking coal of a kind of high expansion lower shrinkage of the present invention participates in comprises the steps:
1) pre-treatment of high expansion lower shrinkage degree low flowing coking coal: lower shrinkage degree low flowing coking coal precomminution of being expanded by height is to different grain size, by the shrink grading of Y value testing method test different grain size coking coal, the granularity that wherein shrink grading is maximum, is defined as reasonable grinding particle size; Described high expansion lower shrinkage degree low flowing coking coal turgidity b>150%, shrink grading X<20mm, maximum fluidity MF<200ddpm, G value >90, Y value 22 ~ 25mm;
2) Blending and ratio is determined: single grade coal comprises the low flowing coking coal of height expansion lower shrinkage degree of reasonable grinding particle size, coking coal, 1/3 coking coal, gas-fat coal, lean coal, the G value of described 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 grade coal is by weight percentage: the low flowing coking coal of high expansion lower shrinkage degree: 15 ~ 20%, coking coal: 35 ~ 45%, 1/3 coking coal: 25 ~ 40%, gas-fat coal: 0-10%, lean coal 10 ~ 15%;
3), after carrying out pulverizing (namely grinding particle size is at below 3mm) according to a conventional method after being mixed by each single grade coal, stove coking is entered.
In aforesaid method, the low flowing coking coal of high expansion lower shrinkage substituting fat adapted after crushed, aforesaid method step 3) in grinding particle size at below 3mm, after referring to that coking coal is pulverized, granularity is at below 3mm, and wherein the coal grain of 2 ~ 3mm accounts for 30 ~ 40% of the whole coal sample of this coking coal.
The present invention is under the condition not having moulded coal, coal humidifying technology, coking on cokery more than 6 meters, 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%.
Embodiment 1
The shrink grading test of the low flowing coking coal of varigrained high expansion lower shrinkage degree:
The low flowing coking coal of the lower shrinkage degree that expanded by height is crushed to respectively and is less than 2mm, is less than 1mm, is less than 0.8mm, is less than 0.6mm, by Y value testing method, the shrink grading of coking coal under the granularity of each granularity and non-precomminution (being namely less than 3mm by producing designated size) after testing precomminution respectively, test data is in table 1:
In various embodiments of the present invention, granularity is less than 2mm: after referring to that coking coal is pulverized, granularity is all at below 2mm, and granularity accounts for 30 ~ 40% of the whole coal sample of this coking coal at the coal grain of 1 ~ 2mm;
Granularity is less than 1mm, and after referring to that coking coal is pulverized, granularity is all at below 1mm, and 0.8 ~ 1.0mm accounts for 30 ~ 40%;
Granularity is less than 0.8mm, and after referring to that coking coal is pulverized, granularity is all at below 0.8mm, and 0.6 ~ 0.8mm accounts for 30 ~ 40%;
Granularity is less than 0.6mm, and after referring to that coking coal is pulverized, granularity is all at below 0.6mm.
The shrink grading of the low flowing coking coal of the varigrained high expansion lower shrinkage degree of table 1
| Granularity | Be less than 3mm | Be less than 2mm | Be less than 1mm | Be less than 0.8mm | Be less than 0.6mm |
| Shrink grading X value | 13mm | 18mm | 22mm | 22mm | 22mm |
As can be seen from the shrink grading testing experiment of the low flowing coking coal of varigrained high expansion lower shrinkage degree, along with the granularity of coking coal reduces, shrink grading constantly reduces, maximum value is reached when granularity is less than 1mm, granularity continues to reduce, shrink grading remains unchanged, and therefore, the reasonable grinding particle size of this coking coal is for being less than 1mm.
Embodiment 2
In the present embodiment, concrete Coal Blending Schemes is as follows:
Gas-fat coal: 0%; The low flowing coking coal of high expansion lower shrinkage degree: 20%; 1/3 coking coal: 30%; Coking coal: 35%; Lean coal: 15%.
The non-precomminution of high expansion lower shrinkage degree low flowing coking coal, be less than 3mm by production designated size and carry out, X value 13mm, the CSR according to above-mentioned Coal Blending Schemes coking gained coke is 63.6%.
Lower shrinkage degree low flowing coking coal precomminution of being expanded by height is less than 2mm, X value 18mm, and the CSR according to above-mentioned Coal Blending Schemes coking gained coke is 65.8%.
Lower shrinkage degree low flowing coking coal precomminution of being expanded by height is less than 1mm, X value 22mm, is 66.9% according to the CSR of scheme gained coke.
Lower shrinkage degree low flowing coking coal precomminution of being expanded by height is less than 0.8mm, X value 22mm, is 66.8% according to the CSR of scheme gained coke.
Lower shrinkage degree low flowing coking coal precomminution of being expanded by height is less than 1mm to granularity, do not having under the coke making process condition such as moulded coal, coal damping, coking on cokery more than 6 meters, its Indexes on Coke Strength can reach: shatter strength M40 reaches 85.5%, abrasive wear resistance M10 reaches 6.8%, reactive (CRI) 26%, post-reaction strength (CSR) more than 66.8%, more non-precomminution height expansion coal improves CSR and improves more than 3%.
Embodiment 3
In the present embodiment, concrete Coal Blending Schemes is as follows:
Gas-fat coal: 5%; The low flowing coking coal of high expansion lower shrinkage degree: 18%; 1/3 coking coal: 27%; Coking coal: 35%; Lean coal: 15%.
The non-precomminution of high expansion lower shrinkage degree low flowing coking coal, be less than 3mm by production designated size and carry out, X value 13mm is 62.4% according to the CSR of scheme gained coke.
Lower shrinkage degree low flowing coking coal precomminution of being expanded by height is less than 2mm, X value 18mm, is 64.8% according to the CSR of scheme gained coke.
Lower shrinkage degree low flowing coking coal precomminution of being expanded by height is less than 1mm, X value 22mm, is 65.9% according to the CSR of scheme gained coke.
Lower shrinkage degree low flowing coking coal precomminution of being expanded by height is less than 0.8mm, X value 22mm, is 65.5% according to the CSR of scheme gained coke.
Lower shrinkage degree low flowing coking coal precomminution of being expanded by height is less than 1mm to granularity, do not having under the coke making process condition such as moulded coal, coal damping, coking on cokery more than 6 meters, its Indexes on Coke Strength can reach: shatter strength M40 reaches 85.5%, abrasive wear resistance M10 reaches 6.8%, reactive (CRI) 26%, post-reaction strength (CSR) more than 65.5%, more non-precomminution height expansion coal improves CSR and improves more than 3%.
Embodiment 4
In the present embodiment, concrete Coal Blending Schemes is as follows:
Gas-fat coal: 10%; The low flowing coking coal of high expansion lower shrinkage degree: 15%; 1/3 coking coal: 25%; Coking coal: 35%; Lean coal: 15%.
The non-precomminution of high expansion lower shrinkage degree low flowing coking coal, be less than 3mm by production designated size and carry out, X value 13mm is 62.5% according to the CSR of scheme gained coke.
Lower shrinkage degree low flowing coking coal precomminution of being expanded by height is less than 2mm, X value 18mm, is 64.7% according to the CSR of scheme gained coke.
Lower shrinkage degree low flowing coking coal precomminution of being expanded by height is less than 1mm, X value 22mm, is 65.9% according to the CSR of scheme gained coke.
Lower shrinkage degree low flowing coking coal precomminution of being expanded by height is less than 0.8mm, X value 22mm, is 65.7% according to the CSR of scheme gained coke.
Lower shrinkage degree low flowing coking coal precomminution of being expanded by height is less than 1mm to granularity, do not having under the coke making process condition such as moulded coal, coal damping, coking on cokery more than 6 meters, its Indexes on Coke Strength can reach: shatter strength M40 reaches 85.5%, abrasive wear resistance M10 reaches 6.8%, reactive (CRI) 26%, post-reaction strength (CSR) more than 65.7%, more non-precomminution height expansion coal improves CSR and improves more than 3%.
Although the present invention only lists a kind of coking coal of the low flowing of height expansion lower shrinkage degree of situation in an embodiment, but contriver finds through research, as long as coking coal meets turgidity b>150%, shrink grading X<20mm, maximum fluidity MF<200ddpm, G value >90, Y value 22 ~ 25mm, and be crushed to rational granularity, adapted is carried out according to Coal Blending Schemes of the present invention as rich coal, technical problem of the present invention can be solved, and reach identical technique effect.
Comparative example 1
Comparative example 1 is compared with embodiment 2, difference is only the low flowing coking coal of height expansion lower shrinkage degree that rich coal (namely rich coal granularity is for being less than 3mm) that comparative example 1 employs non-precomminution instead of precomminution to granularity in embodiment 2 and is less than 1mm, do not having under the coke making process condition such as moulded coal, coal damping according to the Coal Blending Schemes of comparative example 1, coking on cokery more than 6 meters, gained Indexes on Coke Strength is: shatter strength M40 is 86%, abrasive wear resistance M10 is 6.7%, reactive (CRI) is 26.5%, and post-reaction strength (CSR) is 66.5%.
Comparative example 2
Comparative example 2 is compared with comparative example 1, and difference is only that comparative example 2 employs the low flowing coking coal of height expansion lower shrinkage degree that precomminution to granularity is less than 1mm and instead of coking coal in comparative example 1; I.e. gas-fat coal: 0%; Rich coal: 20%; 1/3 coking coal: 30%; The low flowing coking coal of high expansion lower shrinkage degree: 35%; Lean coal: 15%.Do not having under the coke making process condition such as moulded coal, coal damping according to the Coal Blending Schemes of comparative example 2, coking on cokery more than 6 meters, gained Indexes on Coke Strength is: shatter strength M40 is 85.8%, abrasive wear resistance M10 is 6.5%, reactive (CRI) is 26.9%, and post-reaction strength (CSR) is 63.2%.There is the burnt phenomenon of bubble etc.
Comparative example 3
Comparative example 3 is compared with comparative example 2, difference is only the non-precomminution of height expansion lower shrinkage degree low flowing coking coal that comparative example 3 uses, do not having under the coke making process condition such as moulded coal, coal damping according to the Coal Blending Schemes of comparative example 3, coking on cokery more than 6 meters, gained Indexes on Coke Strength is: shatter strength M40 is 82.5%, abrasive wear resistance M10 is 8.2%, reactive (CRI) is 27.6%, post-reaction strength (CSR) is 63.1%, and it is obvious etc. to steep burnt phenomenon.
The coal analysis of the low flowing coking of height expansion lower shrinkage degree in above-described embodiment 1-4 and comparative example 1-3 the results are shown in Table 2:
The coal analysis result of the low flowing coking of table 2 high expansion lower shrinkage degree
In above-described embodiment 1-4 and comparative example 1-3, other participates in coal blending single grade coal coal data in table 3:
Other single grade coal coal coal analysis result of table 3
Claims (2)
1. a coal-blending coking method for the low flowing coking coal participation of high expansion lower shrinkage degree, is characterized in that: the method comprises the steps:
1) pre-treatment of high expansion lower shrinkage degree low flowing coking coal: lower shrinkage degree low flowing coking coal precomminution of being expanded by height is to different grain size, by the shrink grading of Y value testing method test different grain size coking coal, the granularity that wherein shrink grading is maximum, is defined as reasonable grinding particle size; Described high expansion lower shrinkage degree low flowing coking coal turgidity b>150%, shrink grading X<20mm, maximum fluidity MF<200ddpm, G value >90, Y value 22 ~ 25mm;
2) Blending and ratio is determined: single grade coal comprises the low flowing coking coal of height expansion lower shrinkage degree of reasonable grinding particle size, coking coal, 1/3 coking coal, gas-fat coal, lean coal, the G value of described 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 grade coal is by weight percentage: the low flowing coking coal of high expansion lower shrinkage degree: 15 ~ 20%, coking coal: 35 ~ 45%, 1/3 coking coal: 25 ~ 40%, gas-fat coal: 0-10%, lean coal 10 ~ 15%;
3), after pulverizing according to a conventional method after being mixed by each single grade coal, stove coking is entered.
2. the coal-blending coking method of the low flowing coking coal participation of high expansion lower shrinkage degree according to claim 1, it is characterized in that: described step 2) in, each single grade coal is by weight percentage: the low flowing coking coal of high expansion lower shrinkage degree: 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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| CN106010612B (en) * | 2016-05-16 | 2020-02-07 | 武汉钢铁有限公司 | Coal blending and coking method with participation of low-metamorphic high-flow high-expansion coking coal |
| CN107478673A (en) * | 2017-09-22 | 2017-12-15 | 武汉钢铁有限公司 | Dry the dilation assay method of moulded coal |
| CN109447434B (en) * | 2018-10-16 | 2022-03-15 | 武汉钢铁有限公司 | Method for determining charging granularity of coking coal and application of method in coking coal preparation process |
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Effective date of registration: 20170731 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. |