CN104232132A - Petroleum coke-added coke and coking method - Google Patents
Petroleum coke-added coke and coking method Download PDFInfo
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- CN104232132A CN104232132A CN201310238673.6A CN201310238673A CN104232132A CN 104232132 A CN104232132 A CN 104232132A CN 201310238673 A CN201310238673 A CN 201310238673A CN 104232132 A CN104232132 A CN 104232132A
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Abstract
The invention discloses petroleum coke-added coke and a coking method, and is mainly used for solving the technical problem of the prior art that low-ash and high-strength coke capable of meeting melting of a large blast furnace is difficultly obtained by adopting petroleum coke and long-flame coal for coal blending for coking simultaneously. According to the technical scheme, the petroleum coke-added coke is prepared by performing blending and coking the following coals in percentage by mass: 15%-20% of 1/3 coking coal, 20%-30% of gas coal, 20%-30% of fat coal, 30%-35% of coking coal, 0%-5% of lean coal, 2%-5% of long-flame coal and 2%-5% of petroleum coal. According to the petroleum coke-added coke and the coking method, the usage amount of the main coking coal can be saved and the production cost can be lowered on the premise of guaranteeing the quality.
Description
Technical field
The present invention relates to a kind of coke and coking process, particularly a kind of coke and coking process adding refinery coke, belongs to technical field of coal chemical industry.
Background technology
Along with the maximization of blast furnace, quality of metallurgical coke is had higher requirement.Metallurgical coke quality index is defined, wherein first-class metallurgical coke coke shatter strength M40>80%, postreaction strength of coke CSR>55%, ash content Ad<12% in country GB/T1996-2003; At home in the operation of more than 3000m3 Large Scale BF, general requirement coke M40>85%, CSR>65%, Ad<12% are as the Con trolling index of key.
In coke, ash content, sulphur content are directed to coking coal.Owing to containing higher ash content, sulphur content in China's coking coal resource, all transfer in coke at process of coking ash content, sulphur content major part is transferred in coke, affects by this, and coke quality is difficult to the level reaching first-class metallurgical coke.On the other hand, high-quality caking coal resource is more and more poorer, in the long run, how non-coal additive or non-coking coal are used for coking produce in production metallurgy Jiao be our problem in the urgent need to address.
Long-flame coal is a kind of non-coking coal, and it is closer to the bottle coal in coking coal, and volatile matter is high, does not have cohesiveness, and at China's rich reserves, cost is lower.Chinese Patent Application No. is CN200910035416.6, and name is called a kind of low-cost high-strength coke and coking process thereof, disclose a kind of on the dress coke oven of top directly with addition of the method for long-flame coal, the hot strength of coke CSR obtained 65 ~ 70% high-strength coke.But due to the ash content containing about 6 ~ 7% in long-flame coal, reduce coke ash by long-flame coal and there is certain difficulty, after adding long-flame coal in this patent, coke ash is 12.28 ~ 12.9%.On the other hand, can save coking coal, and the price of long-flame coal is well below coking coal after adding long-flame coal, after therefore adopting the present invention, coke cost during smelting can reduce about 5 ~ 8%, reduces production cost.
Refinery coke is the by product of stock oil when Pintsch process produces light-end products of delayed coking unit in oil refining process, ash oontent extremely low (being generally less than 0.5%), volatile matter is close to hard coal, and sulphur content content is determined by raw material oil properties, in high-sulfur, sulphur low sulfur petroleum Jiao has, in China based on high sulfur petroleum coke.
The direct coal blending process of refinery coke refers to directly to be allocated into refinery coke in coking coal, but because the singularity of refinery coke produces certain impact to coking property, Chinese Patent Application No. is CN200610117253.2, name is called the patent application of the first-class metallurgical coke that a kind of ordinary coking coal is produced and production method thereof, disclose a kind of method that ordinary process produces first-class metallurgical coke, mainly solve fat coal and produce the higher technical problem of first-class metallurgical coke ash content.Its coal blending per-cent is: rich coal 15-20%, 1/3 coking coal 10-20%, coking coal 40-50%, bottle coal 15-25%, refinery coke 5-8%.Wherein refinery coke ash content is less than 0.55%, and sulphur content is less than 0.5%, and volatile matter is less than 11.5%.This invention is added refinery coke and is reduced coke ash in common coking coal, produce first-class metallurgical coke, its ash content is less than 12%, sulphur content is less than 0.6%, M40>80%, M10<7.5%, reactive CRI<30, post-reaction strength CSR>55%.Although reach the quality of first-class metallurgical coke in this invention, its intensity is lower, is still difficult to the requirement meeting the hot and cold intensity of Large Scale BF coke STRENGTH ON COKE.
In prior art, directly with addition of long-flame coal on the dress coke oven of top, solve the problem of coke high strength and low cost, but coke ash is higher; Directly with addition of refinery coke, solve the low-ash problem of coke, but intensity can not meet the needs that Large Scale BF is smelted.
For this reason, propose a kind of coal blending process adding refinery coke coking, the Blending basis allocating long-flame coal into adds refinery coke, reduces coke cost further, improve coke quality.
Summary of the invention
The object of this invention is to provide a kind of coke and the coking process that add refinery coke, mainly solve in prior art and carry out coal-blending coking with refinery coke, long-flame coal simultaneously, be difficult to acquisition and can meet the low ash content of large blast furnace smelting, the technical problem of high-strength coke.
The technical solution used in the present invention is:
Add a coke for refinery coke, formed by following mass percent coal blending mixed coking: 1/3 coking coal 15-20%, bottle coal 20-30%, rich coal 20-30%, coking coal 30-35%, lean coal 0-5%, long-flame coal 2-5%, refinery coke 2-5%.
A coking process for adapted Canada coking coal, comprises the following steps:
A, carry out the precrushing of long-flame coal, refinery coke, the long-flame coal of below particle diameter 3mm, refinery coke account for its total mass 65-75%;
After b, precrushing, long-flame coal, refinery coke and other coal are by following mass percent coal blending, 1/3 coking coal 15-20%, bottle coal 20-30%, rich coal 20-30%, coking coal 30-35%, long-flame coal 2-5%, refinery coke 2-5%;
C, Mixture Density Networks are broken, by the Mixture Density Networks fragmentation (Mixture Density Networks that particle diameter should be made to be less than 3mm accounts for 75% ~ 80% of its total mass) after coal blending in step b;
D, coal-blending coking, the Mixture Density Networks after fragmentation is sent into top dress coking by coke oven, coking temperature is 1000 ± 50 DEG C, and coking time is 20 ± 2 hours;
E, discharge of the coke after cooling.
Carry out coke quality detection afterwards, measure the indexs such as coke ash, sulfur content in coke, coke reactivity and post-reaction strength.
Because refinery coke and long-flame coal all do not have cohesiveness, therefore according to traditional mode of thinking, be difficult to refinery coke directly to coordinate with long-flame coal be used in coal-blending coking, the present invention breaks through prior art, applicant recognizes after research for many years: because refinery coke does not have cohesiveness, in coal-blending coking, play inertia effect, this requires that coke making and coal blending structure is corresponding and adjusts.
Find according to lot of experiments, refinery coke and long-flame coal are different in coal-blending coking role mechanism, have complementary effect to a certain extent, and reasonable coordination use, can reach better effect.Research finds, add after long-flame coal carries out coal-blending coking in basic mixed coal, the optical texture composition of gained coke changes, and is embodied in: along with the increase of the long-flame coal amount of allocating into, coke isotropy and fusain and fragmentation tissue increase, and mosaic structure and fibrous tissue reduce.Along with the increase of long-flame coal allocation ratio, the micro strength of coke is thereupon deteriorated, and coke quality declines gradually.
Add refinery coke in the Blending adding long-flame coal after, find the increase along with the refinery coke amount of allocating into, coke mosaic structure and fibrous tissue increase, and isotropic tissue reduces, coke anisotropic degree increases, and this is with to add separately the impact that long-flame coal causes just in time contrary.This is because: in charred coal organization, in coke, an optical texture and carbon dioxide reaction size order are: isotropic > pattern structure > fibrous tissue.Increase by adding long-flame coal isotropic, coke reactivity increases, and by adding refinery coke, fibrous tissue increases, and coke reactivity reduces.Therefore in coke making and coal blending, allocate long-flame coal and refinery coke into, STRENGTH ON COKE optical texture plays the effect of balance simultaneously, makes anisotropic degree balanced, thus plays the effect controlling coke quality.
Allocating long-flame coal and refinery coke in coke making and coal blending simultaneously, by conservative control additional proportion, when keeping higher coke strenth, coke ash can be reduce further.
Experiment shows, after adopting technique scheme of the present invention, coke shatter strength M40 can be greater than 85%, and post-reaction strength is greater than 65%, and coke ash is less than 12%, therefore, it is possible to meet 3000m
3and the needs of above blast-furnace smelting.
The present invention has following positively effect compared to existing technology:
1. the present invention breaks through the restriction of prior art, by refinery coke and the common adapted of long-flame coal in coke making and coal blending, makes anisotropic degree in charred coal organization balanced, stabilizes coke quality.
2. the coke making and coal blending method of interpolation refinery coke provided by the invention, long-flame coal and the common coking of refinery coke, reduce the consumption of coking coal, saved valuable coking coal resource, had certain social benefit.
3. the reserves of long-flame coal are comparatively wide, participate in Blending and can reduce coke production cost.
4. the present invention adopts common top to coaling coal blending process route, compares with stamp-charging coke with shaped coal, and technique is simple, and does not need to increase pre-processing device, is easier to application, uses the coal-blending coking of refinery coke and long-flame coal under being suitable for not changing the condition of existing technique.
Embodiment
A kind of coke adding refinery coke of the present invention, is formed by following mass percent coal blending mixed coking: 1/3 coking coal 15-20%, bottle coal 20-30%, rich coal 20-30%, coking coal 30-35%, lean coal 0-5%, long-flame coal 2-5%, refinery coke 2-5%.Concrete proportioning is in table 1, and table 1 is specific embodiment, the non-adapted refinery coke of scheme 1, scheme 2 Petroleum coke proportion 2%, scheme 3 Petroleum coke proportion 3%, scheme 4 refinery coke 4%, the postreaction strength of coke (CSR) being obtained coke by the charging coke coking of 6m top is 65% ~ 70%.
Add a coking process for refinery coke, comprise the following steps:
A, carry out the precrushing of long-flame coal, refinery coke, the long-flame coal of below particle diameter 3mm, refinery coke account for its total mass 65-75%;
After b, precrushing, long-flame coal, refinery coke and other coal are by following mass percent coal blending, 1/3 coking coal 15-20%, bottle coal 20-30%, rich coal 20-30%, coking coal 30-35%, lean coal 0-5%, long-flame coal 2-5%, refinery coke 2-5%;
C, Mixture Density Networks are broken, and the Mixture Density Networks after coal blending in step b is broken, and the Mixture Density Networks making particle diameter be less than 3mm accounts for 75% ~ 80% of its total mass;
D, coal-blending coking, the Mixture Density Networks after fragmentation is sent into top dress coking by coke oven, coke furnace carbonization chamber height is 6m, and coking temperature is 1000 DEG C, coking time 20h;
E, discharge of the coke after cooling.
Carry out coke quality detection afterwards, measure the indexs such as coke ash, sulfur content in coke, coke reactivity and post-reaction strength, measuring result is in table 1.
The embodiment of the present invention adopts 6m to push up charging coke coking, coal-blending coking is carried out with long-flame coal, refinery coke, coal blending volatile matter (Vd) is 28 ~ 30%, caking index is 75 ~ 85, with the five class coal cokings with 1/3 coking coal, bottle coal, rich coal, coking coal and lean coal in prior art, obtain having the substantially identical coke of quality, postreaction strength of coke (CSR) is 65% ~ 70%, and coke ash is less than 12%.
Table 1 coke making and coal blending (mass percent) and coke quality data sheet
Scheme 2 to scheme 4 measurement result as can be seen from upper table 1, coal-blending coking is carried out with long-flame coal, refinery coke replacement rich coal, coking coal, the each qualitative data obtaining coke is substantially identical with original data not using long-flame coal and the scheme 1 of refinery coke to measure, and can meet 3000m completely
3and the needs of above blast-furnace smelting.
Be summed up, the present embodiment has following beneficial effect:
1, coking coal resource is expanded.The consumption of refinery coke and long-flame coal reaches 5-8%, expands the scope of coking coal, has saved high-quality caking coal resource, and resource is optimized utilization.
2, coke quality is maintained.Long-flame coal and the common Coal Blending Technology of refinery coke make anisotropic degree in charred coal organization balanced, stablize coke cold strength M
40be greater than 85%, hot strength CSR is greater than 65%, ensure that coke meets the needs of blast furnace ironmaking.
3, the operational path adopting common top to coaling with addition of long-flame coal and refinery coke, compares with stamp-charging coke with shaped coal, and technique is simple, does not need to increase pre-processing device, is easier to application, is suitable for not changing coking under the condition of existing technique.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (6)
1. add a coke for refinery coke, it is characterized in that being formed by following mass percent coal blending mixed coking: 1/3 coking coal 15-20%, bottle coal 20-30%, rich coal 20-30%, coking coal 30-35%, lean coal 0-5%, long-flame coal 2-5%, refinery coke 2-5%.
2. a kind of coke adding refinery coke as claimed in claim 1, it is characterized in that long-flame coal, refinery coke need through fragmentations, the long-flame coal of below particle diameter 3mm, refinery coke account for its total mass 65-75%.
3. a kind of coke adding refinery coke as claimed in claim 1, is characterized in that, Mixture Density Networks need through fragmentation, and the Mixture Density Networks of below particle diameter 3mm accounts for 75% ~ 80% of its total mass.
4. add a coking process for refinery coke, it is characterized in that comprising the following steps:
A, carry out the precrushing of long-flame coal, refinery coke;
After b, precrushing, long-flame coal, refinery coke and other coal are by following mass percent coal blending, 1/3 coking coal 15-20%, bottle coal 20-30%, rich coal 20-30%, coking coal 30-35%, lean coal 0-5%, long-flame coal 2-5%, refinery coke 2-5%;
C, Mixture Density Networks are broken, and the Mixture Density Networks after coal blending in step b is broken;
D, coal-blending coking, the Mixture Density Networks after fragmentation is sent into top dress coking by coke oven, coking temperature is 1000 ± 50 DEG C, and coking time is 20 ± 2 hours;
E, discharge of the coke after cooling.
5. a kind of coking process adding refinery coke as claimed in claim 4, is characterized in that, long-flame coal described in step a, refinery coke need through fragmentations, and the long-flame coal of below particle diameter 3mm, refinery coke account for its total mass 65-75%.
6. a kind of coking process adding refinery coke as claimed in claim 4, is characterized in that, in described step c, after Mixture Density Networks fragmentation, the Mixture Density Networks of below particle diameter 3mm accounts for 75% ~ 80% of its total mass.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106542514A (en) * | 2016-10-18 | 2017-03-29 | 马龙县明龙焦化实业有限公司 | Compound semi-coke reducing agent of the high temperature of metallic silicon and preparation method thereof and using method |
| CN110484288A (en) * | 2019-08-23 | 2019-11-22 | 山西沁新能源集团股份有限公司 | A kind of method of coke making and coal blending |
| CN110540849A (en) * | 2019-09-24 | 2019-12-06 | 上海茜昆实业发展有限公司 | Energy-saving and environment-friendly coke and preparation method thereof |
| CN115093869A (en) * | 2022-03-22 | 2022-09-23 | 中冶焦耐(大连)工程技术公司 | High-reactivity high-strength heterogeneous coke for hydrogen-rich blast furnace and preparation method thereof |
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| CN115093869A (en) * | 2022-03-22 | 2022-09-23 | 中冶焦耐(大连)工程技术公司 | High-reactivity high-strength heterogeneous coke for hydrogen-rich blast furnace and preparation method thereof |
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Application publication date: 20141224 |