CN102559228A - Lignite retorting, blending and coking process - Google Patents
Lignite retorting, blending and coking process Download PDFInfo
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- CN102559228A CN102559228A CN2010106174225A CN201010617422A CN102559228A CN 102559228 A CN102559228 A CN 102559228A CN 2010106174225 A CN2010106174225 A CN 2010106174225A CN 201010617422 A CN201010617422 A CN 201010617422A CN 102559228 A CN102559228 A CN 102559228A
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Abstract
The invention discloses a lignite retorting, blending and coking process which comprises the following steps: firstly carrying out retorting on lignite with low ash, low sulfur and high ash fusion point to obtain coalite and crushing the coalite until the granularity is less than 5mm; and then uniformly mixing 20-40wt% of coalite generated by the retorting of the lignite, 30-40wt% of prime coking coal, 20-30% of fat coal, 5-10wt% of gas coal and 5wt% of other coals, loading the mixture into a coke oven, and carrying out high-temperature retorting for 10-30 hours till coking, wherein the weight percent of the whole components is 100%. The process disclosed by the invention has the following advantages: 1, the high-quality prime coking coal consumption can be reduced, the coal blending and coking range can be enlarged, and the coking cost is lowered; 2, volatile constituents of coals can be flexibly adjusted and matched, and the cold/thermal state strength and lumpiness of coke can be improved; and 3 the ash content and sulfur content of the coke can be reduced, and the coke-iron ratio and the coke quality can be improved.
Description
Technical field
The invention belongs to technical field of coal chemical industry, relate to a kind of brown coal destructive distillation coal-blending coking technology.
Background technology
Though coal resources in China is abundant, finds out 10,201 hundred million tons of coal resources reserves by the end of the year 2002.Coking coal accounts for 27.65%, and wherein bottle coal accounts for 13.75%, and rich coal accounts for 3.53%, and coking coal accounts for 5.81%, and lean coal accounts for 4.01%, and other account for 0.55%, and coal and coal source distribution are irregular.Development along with Iron And Steel Industry; Quality and quantity to metallurgical coke will propose higher requirement; Its result certainly will increase the degree of dependence to high-quality caking coal (coal of low ash, low-sulfur, strong cohesive property); And this contradiction has more been given prominence in the obvious shortage of China's high-quality caking coal, and it is promoting the development of coal-blending coking and non-coking coal coking technology.
In order to enlarge coking coal resource; Weakly caking coal or non-caking coal are used for coking; The various new technologies (moulded coal, the artificial caking coal of adapted or anti-fissuring agent etc. are pulverized, made firm by ramming, join in coal drying, preheating, selection) that are suitable for conventional coke oven coal-blending coking have reached industrialized level, solve the main method of producing the high-quality coke with relatively poor coking coal thereby become.
For non-coking coal (hard coal, brown coal, long-flame coal, weakly caking coal, non-caking coal) coal-blending coking technology, also there is employing directly to mix a spot of (hard coal, brown coal, weakly caking coal, long-flame coal, non-caking coal) coal and carries out coal-blending coking.
For allocating a spot of hard coal coal-blending coking into, weak point mainly contains 2 points: the one, and the low ash of fine, doctor negative anthracitic commodity amount is few; The 2nd, mix the cohesiveness of joining behind the hard coal with coal and descend and be directly proportional with the amount of allocating into, so the amount of allocating into less (being lower than 10%).
Directly mix a small amount of brown coal coal-blending coking weak point and mainly contain 2 points: the one, the cohesiveness of allocating the mixed coal behind the brown coal into descends and is directly proportional with the amount of allocating into, so the amount of allocating into less (being lower than 10%).The 2nd, reduce the hot and cold peptide intensity of coke and the lumpiness of coke.
The ash content index of China's blast-furnace coke is compared higher with other countries, it is the ropy major cause of coke, and the reason that the coke ash content is high is the ash content Gao Suozhi of coking coal cleans.If can the ash content of coke be reduced to 10.5% by 14.5%, calculate with the blast furnace of producing 4.7 hundred million tons of pig iron per year, can practice thrift 1,528 ten thousand tons of flux, 2,585 ten thousand tons of cokes, can increase by 6,815 ten thousand tons of the pig iron simultaneously, can also reduce the traffic capacity of railway.
Summary of the invention
The object of the present invention is to provide a kind of brown coal destructive distillation coal-blending coking technology; Not only can reduce the consumption of high-quality coking coal, enlarge the scope of coal-blending coking coal, reduce the coking cost; And can adjust the volatile matter of mixed coal flexibly; Improve the hot and cold peptide intensity and the lumpiness of coke, effectively reduce the ash content and the sulphur content of coke, improve the quality of coke-iron-rate and coke.
The objective of the invention is to realize like this; A kind of brown coal destructive distillation coal-blending coking technology; The brown coal destructive distillation that at first will hang down ash, low-sulfur, high ash melting point becomes semicoke and is crushed to granularity less than 5mm, then with the semicoke that generates after the brown coal destructive distillation with the weight ratio of 20%-40% and coking coal 30-40%, rich coal 20-30%, bottle coal 5-10%, other coals 5%, adding up to each composition weight is 100%; Mixing, the coke oven of packing into together carries out high temperature carbonization 10-30 hour coking.
Technology of the present invention is selected the brown coal of low ash, low-sulfur, high ash melting point for use, adopts distillation process, and the volatile matter of reduction brown coal mixes the brown coal after the destructive distillation of certain ratio, thereby realizes three purposes of the present invention according to the requirement of coal blending technology.With respect to coking coal; The domestic brown coal that a large amount of low ashes, low-sulfur, high ash melting point, low price are arranged; Ash content, sulphur content are still very low after the brown coal destructive distillation, can reduce after allocating into to cooperate pit ash and sulphur content, thereby reduce ash content, sulphur content and the coking cost that generates coke.Can adjust the destructive distillation time and the temperature of brown coal flexibly according to the needs of coal blending, finally control the volatile matter of brown coal after the destructive distillation, with the purpose of the volatile matter that reaches flexible adjustment mixed coal.Evidence: when coke is heated to above the coking temperature in blast furnace,, can around ash particles, produce and expanded crack, quicken coke fragmentation or efflorescence because colloid is different with the ash content thermal expansivity.Basic metal also can quicken the reaction of coke with carbonic acid gas in the ash content, also makes the destruction aggravation of coke.Therefore, the height of the height of coke ash content, the alkali metal content in the ash content also is to influence coke in one of important factor of blast furnace endogenous pyrogen peptide intensity.
So select the brown coal of low ash after the destructive distillation, low-sulfur, low volatile, high grey fusibleness for use; Can reduce and cooperate pit ash, sulphur content and volatile matter; Change the ash component of mixed coal, can reduce the heat reactivity of coke in blast furnace simultaneously, thereby improve the hot and cold peptide intensity of coke.Evidence: after the brown coal of same ratio and the brown coal after the destructive distillation mix rich coal (coking coal); The caking index of its mixed coal has very big difference, and (it is 98 that the brown coal after the destructive distillation are allocated 20% caking index into; It is 97 that not destructive distillation brown coal are allocated 5% caking index into, and the caking index of former rich coal is 102).
Brown coal after the destructive distillation with the difference of the coke powder coal-blending coking of using as leaning agent are: the one, and ash content, sulphur content are lower than coke powder, can adjust the volatile matter of mixed coal flexibly.The 2nd, have price advantage, coke powder is the product of coking coal after all.The 3rd, allocate that the caking index of brown coal and its mixed coal of coke powder has significant difference after the destructive distillation of same ratio into, the brown coal amount of allocating into after the destructive distillation is big.
The difference of brown coal after the destructive distillation and hard coal coal-blending coking is: the one, and ash content and sulphur content are lower than hard coal, can adjust the volatile matter of mixed coal flexibly.The 2nd, have price advantage, its price of the brown coal of equal quality is lower than hard coal, and reserves are abundant.The 3rd, the brown coal of allocating into after the destructive distillation of same ratio are compared with hard coal, and the caking index of its mixed coal has significant difference, and the brown coal amount of allocating into after the destructive distillation is big.
The difference of the brown coal after the destructive distillation and not pyrogenous brown coal coal-blending coking is: the one, and after allocating into, can improve in the brown coal after the destructive distillation the hot and cold peptide intensity and the lumpiness of coke.The 2nd, the caking index of mixed coal has significant otherness, and the amount of allocating into of the brown coal after the destructive distillation is big.The 3rd, the brown coal after the destructive distillation can be adjusted the volatile matter of mixed coal flexibly.
After distillation of lignite and poor, of thin coal coking coal is the difference between: lignite reserves, compared to the low price, you can easily use than lean, lean coal ash, sulfur lower lignite.
Technology of the present invention and " gasification, destructive distillation, carbonization system ensemble pyrogenic process " the both remarkable difference of (formcoke from cold briquetting method) have 6 points:
(1) technology of production coke is different
The present invention has followed traditional coke making process basically:
1, brown coal destructive distillation and being crushed to less than 5mm.
2, the pyrogenous semicoke of brown coal and other coal blending mixings.
3, the coke oven of packing into carries out high temperature carbonization coking.
" gasification, destructive distillation, carbonization system ensemble pyrogenic process " is the technology that typical formcoke from cold briquetting method is produced coke:
1, brown coal destructive distillation and being crushed to less than 1.5mm.
2, carburelant, sticker are crushed to less than 1.5mm, with destructive distillation semicoke, tar mixing.
3, be cold-pressed into moulded coal.
4, with the moulded coal of the coldmoulding high temperature cabonization in the pit kiln of packing into.
(2) raw material of production coke, proportioning, granularity difference
Raw material of the present invention and proportioning: semicoke 20-40%, coking coal 30-40%, rich coal 20-30%, bottle coal 5-10%, other coals 5% add up to each composition weight 100%.The semicoke granularity is less than 5mm, all the other mixed coal granularities constant (being generally less than 50mm).
" gasification, destructive distillation, carbonization system ensemble pyrogenic process " be the raw material and the proportioning of formcoke from cold briquetting method both: semicoke 35-55%, carburelant 15-25%, sticker 15-25%, tar 15-25%.Or semicoke 55-75%, sticker 15-25%, the granularity of tar 10-20%. all raw materials is less than 1.5mm.
(3)The mechanism of bonding semicoke is different
Agglutinating mechanism of the present invention is: utilize other mixed coals in coke oven, to heat in the retort process,
The plastic mass that produces bonds together the pyrogenous semi-coke powder of brown coal.
" gasification, destructive distillation, carbonization system ensemble pyrogenic process " both the agglutinating mechanism of formcoke from cold briquetting method is: the pyrogenous semi-coke powder of brown coal, add sticker, tar mixing again, and bond together through the molding coal machine extrusion molding.
(4) quality of product structure, coke, granularity difference
1, because the production technique of two kinds of coke making process, raw material, proportioning, bonding mechanism are different, the quality of the coke of therefore producing, hot and cold peptide intensity are different, its chemical by-product as: tar, benzene, coal gas etc. must be different.
2, production coke size of the present invention is generally less than 150mm, and " gasification, destructive distillation, carbonization system ensemble pyrogenic process " both the formcoke from cold briquetting method coke size of producing was more regular, can produce according to demand, 40-80mm, 60-100mm etc. are generally arranged.
(5) select for use the standard of brown coal different
" gasification, destructive distillation, carbonization system ensemble pyrogenic process " both the standard of selecting materials of formcoke from cold briquetting method is: low ash, low-sulfur.
The standard of selecting materials of the present invention is: low ash, low-sulfur, high ash melting point.Purpose is to change cooperation pit ash, volatile matter, ash component through allocating selected raw material into, thereby changes ash content, the ash component of coke, improves heat reactivity and the hot peptide intensity of coke in blast furnace.
(6) cycle of production coke is different
Mixed coal of the present invention gets in the coke oven, 10-30 hours cokings of high temperature carbonization.
" gasification, destructive distillation, carbonization system ensemble pyrogenic process " both formcoke from cold briquetting method adds the moulded coal of moulding in the pit kiln, and 950-1050 ℃ of following carbonizations of anaerobic high temperature cabonization temperature 4 hours, carbonization became the formed coke product.
The present invention has 3 points with the significance difference opposite sex of Japan's " research and development of SCOPE21 coking technology and use "
(1) coke making process is different.
The present invention prolongs and has attacked traditional coal-blending coking technology, and its technical process had three steps: broken after the 1 brown coal destructive distillation.2, the semicoke after the destructive distillation and other coal mixing that proportions.3, get into the coking of coke oven high temperature carbonization.
(2) technology of raw material processing, quantity, granularity difference.
1, destructive distillation was handled before the present invention only went into coke oven to required brown coal (20-40%).
Japan's " research and development of SCOPE21 coking technology and use " is all raw materials (100%) to be heat-treated with moulded coal of hot pressing handle before going into coke oven.
2, raw material is handled the granularity difference
The present invention only arrives semicoke to the required destructive distillation of carrying out of allocating brown coal into, and is crushed to below the 5mm, and the granularity of other coal blendings is constant.
Japan " research and development of SCOPE21 coking technology and use " technology be to all raw materials by
0.5mm stage treatment.
, treatment process is different
Japan's " research and development of SCOPE21 coking technology and use " is to carrying out thermal pretreatment (350 ℃) greater than the coal grain of 0.5mm going into the stokehold.Carry out thermal pretreatment (165 ℃) and carry out hot-forming coal going into the stokehold less than the coal grain of 0.5mm.
The present invention only carries out the destructive distillation pre-treatment to the required brown coal of allocating into going into the stokehold.
(3) the coke forming process is different
Coke making process of the present invention is to prolong to attack traditional coke making process, and coke is once shaped in coke oven.
Japan " research and development of SCOPE21 coking technology and use " pretreating raw material be introduced in the coke oven, in, the low-temperature pyrolysis coking, coke gets into CDQ upgrading chamber again, finally forms the coke of required quality.
In sum, technology of the present invention compared with prior art greatly reduces production cost, has enlarged the coking raw material sources.Have outstanding substantive distinguishing features and obvious improvement, this is simple for process, and easy handling is easy to use.
Embodiment
A kind of brown coal destructive distillation coal-blending coking technology; The brown coal destructive distillation that at first will hang down ash, low-sulfur, high ash melting point becomes semicoke and is crushed to granularity less than 5mm; Then with the semicoke that generates after the brown coal destructive distillation with the weight ratio of 20%-40% and coking coal 30-40%, rich coal 20-30%, bottle coal 5-10%, other coals 5%; Adding up to each composition weight is 100%, mixing, and the coke oven of packing into together carries out high temperature carbonization 10-30 hour coking.
Technology one of the present invention is to reduce the consumption of high-quality coking coal, enlarges the scope of coal-blending coking coal, reduces the coking cost.The 2nd, can adjust the volatile matter of mixed coal flexibly, improve the hot and cold peptide intensity and the lumpiness of coke.The 3rd, the ash content and the sulphur content of reduction coke, the quality of raising coke-iron-rate and coke.
Preferred implementation as technology of the present invention; The brown coal destructive distillation that at first will hang down ash, low-sulfur, high ash melting point becomes semicoke and is crushed to granularity is 3mm; Then with the semicoke that generates after the brown coal destructive distillation with 30% weight ratio and coking coal 30%, rich coal 30%, bottle coal 5%, other coals 5%; Adding up to each composition weight is 100%, and mixing, the coke oven of packing into together carry out 20 hours cokings of high temperature carbonization.
Claims (2)
1. brown coal destructive distillation coal-blending coking technology; It is characterized in that: the brown coal destructive distillation that at first will hang down ash, low-sulfur, high ash melting point becomes semicoke and is crushed to granularity less than 5mm; Then with the semicoke that generates after the brown coal destructive distillation with the weight ratio of 20%-40% and coking coal 30-40%, rich coal 20-30%, bottle coal 5-10%, other coals 5%; Adding up to each composition weight is 100%, mixing, and the coke oven of packing into together carries out high temperature carbonization 10-30 hour coking.
2. brown coal destructive distillation coal-blending coking technology according to claim 1; It is characterized in that: the brown coal destructive distillation that at first will hang down ash, low-sulfur, high ash melting point becomes semicoke and is crushed to granularity is 3mm; Then with the semicoke that generates after the brown coal destructive distillation with 30% weight ratio and coking coal 30%, rich coal 30%, bottle coal 5%, other coals 5%; Adding up to each composition weight is 100%, and mixing, the coke oven of packing into together carry out 20 hours cokings of high temperature carbonization.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106174225A CN102559228A (en) | 2010-12-31 | 2010-12-31 | Lignite retorting, blending and coking process |
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| CN2010106174225A CN102559228A (en) | 2010-12-31 | 2010-12-31 | Lignite retorting, blending and coking process |
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| CN102559228A true CN102559228A (en) | 2012-07-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102965134A (en) * | 2012-11-14 | 2013-03-13 | 山西煤炭进出口集团科技发展有限公司 | Lignite coking method |
| CN108192648A (en) * | 2017-12-15 | 2018-06-22 | 新疆八钢铁股份有限公司 | A kind of technique that Ou Ye oven cokes are refined based on bottle coal |
| CN108753329A (en) * | 2018-05-07 | 2018-11-06 | 中国科学院山西煤炭化学研究所 | A method of it improving low-order coal coal blending and produces high-strength coke yield |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1250797A (en) * | 1999-11-26 | 2000-04-19 | 山西千熺型焦科技有限公司 | Shaped coke produced win non-adhesive coal and its prodn. method |
| CN1303906A (en) * | 1999-12-22 | 2001-07-18 | 葛立奎 | Method for producing formed coke by using low-ash high-volatile long-flame coal |
-
2010
- 2010-12-31 CN CN2010106174225A patent/CN102559228A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1250797A (en) * | 1999-11-26 | 2000-04-19 | 山西千熺型焦科技有限公司 | Shaped coke produced win non-adhesive coal and its prodn. method |
| CN1303906A (en) * | 1999-12-22 | 2001-07-18 | 葛立奎 | Method for producing formed coke by using low-ash high-volatile long-flame coal |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102965134A (en) * | 2012-11-14 | 2013-03-13 | 山西煤炭进出口集团科技发展有限公司 | Lignite coking method |
| CN108192648A (en) * | 2017-12-15 | 2018-06-22 | 新疆八钢铁股份有限公司 | A kind of technique that Ou Ye oven cokes are refined based on bottle coal |
| CN108753329A (en) * | 2018-05-07 | 2018-11-06 | 中国科学院山西煤炭化学研究所 | A method of it improving low-order coal coal blending and produces high-strength coke yield |
| CN108753329B (en) * | 2018-05-07 | 2020-12-01 | 中国科学院山西煤炭化学研究所 | Method for improving yield of high-strength coke prepared by low-rank coal blending |
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Application publication date: 20120711 |