CN104073274A - Production method of metallurgical coke - Google Patents
Production method of metallurgical coke Download PDFInfo
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- CN104073274A CN104073274A CN201310103730.XA CN201310103730A CN104073274A CN 104073274 A CN104073274 A CN 104073274A CN 201310103730 A CN201310103730 A CN 201310103730A CN 104073274 A CN104073274 A CN 104073274A
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- coking
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- 239000000571 coke Substances 0.000 title claims abstract description 94
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 239000003245 coal Substances 0.000 claims abstract description 120
- 238000004939 coking Methods 0.000 claims abstract description 51
- 238000007731 hot pressing Methods 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 23
- 238000000227 grinding Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 34
- 230000009257 reactivity Effects 0.000 abstract description 13
- 238000011112 process operation Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 23
- 239000004484 Briquette Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011335 coal coke Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The invention discloses a production method of metallurgical coke, which comprises blending coal and coking, wherein the coal from a blending coal tank is mixed into blended coal, the blended coal is sent into a hot-pressing device according to the mass percentage of 10-40% to be hot-pressed into hot-pressed blocks, and the hot-pressed blocks are crushed and then are mixed with the other part of blended coal which is not hot-pressed, and then are sent into a coke oven to be coked; the hot pressing temperature is 300-650 ℃; the hot pressing pressure is 5-30 MPa; the residence time under the hot-pressing operating pressure is within 5 seconds. The process operation method is simple and easy for practical application, and effectively improves the quality of the coke under the condition of not changing the proportioning of the blended coal, so that the reactivity of the coke is reduced, the strength after reaction is increased, the high-quality coking coal is protected, and the production cost of the coke is reduced.
Description
Technical field
The invention belongs to coal processing field, relate to the production technology of coal blending and coke, particularly relate to a kind of production method of metallurgical coke.
Background technology
Although China's coking coal coal is complete, but it is very unbalanced to distribute, coking coal, rich coal are main force's coals of producing coke, and in Chinese coking coal resource, coking coal only accounts for less than 24%, rich coal, gas-fat coal only account for approximately 13%, remove high ash, high-sulfur, difficult washing, can not be used for the part of coking, and the coking coal of high-quality and rich coal account for the ratio less than 6% and 3% of finding out coal resources reserves.High-quality coking coal, rich coal shortage at present become the obstacle of Some Enterprises guarantee coke quality.
Conventional mixed coal coke making process will reach the object that improves coke quality, a large amount of uses of having to are cohered by force coal and are carried out mixed coal coking, particularly improving coke reactivity and post-reaction strength by coal blending need to allocate into and cohere by force coal, and it is very limited to cohere by force coal resource, and postreaction strength of coke will reach 65%, what need to allocate into 75%-80% coheres by force coal, this just causes current mixed coal coking actual use proportioning and China's coking coal reserves proportion serious unbalance, has verified coking coal reserves and has only enough exploited and use decades by current usage ratio.
At present, tamping coking and join being applied in of the novel coke making process such as moulded coal and alleviated to a certain extent China's coking coal and the conflicting situation of coking coal reserves.But, along with these novel coke making process progressively application and coke oven towards maximize future development, the limitation of these novel coking technologies also displays gradually.
As " a kind of metallurgical coke and production method thereof " (CN1513948A) invents, the metallurgical coke that this scheme is produced is made up of rich coal, bottle coal, weakly caking coal, coking coal, coke powder.Weakly caking coal of the present invention is the weakly caking coal of designated area, for other application this coals in area far away, can cause transportation cost to increase, and therefore, this scheme is subject to the restriction of popularity application.
Tamping coking is except part needs extra interpolation cakingagent, and its operating procedure is also comparatively complicated.Except making firm by ramming operating equipment of necessity, also comprise blending device when primary heater unit, the band of making preoperative Coal pretreatment firm by ramming add cakingagent technique, what is more important also needs to install cleaning apparatus, tamping coking is because briquette pushes coking chamber under the condition of pusher side oven door opening, if do not take dust suppression, flue dust and raw gas will escape in a large number, even more serious and severe to the damage ratio top dress coke oven of environment.In addition, because coke oven is towards the future development maximizing at present, the height of its tamping briquette has been subject to the restriction of technical qualification, and as briquette height exceedes 5.5 meters, the stability of briquette is had a strong impact on, and very easily collapses.Once briquette collapses, a large amount of coal dusts will pile up pushing machine side, and pushing machine can not enterprising every trade be walked at original runway, affect the coal-charging pushing work of other coking chambers.Therefore, the tamping coking technique in the novel coke making process that changes coke quality is not only subject to the impact of the factor such as complex process, long flow path, and tamping briquette height can not meet the development need of coke oven maximization direction.
Making firm by ramming in metallurgical coke production technique except technical process complexity, equipment is many, investment is larger shortcoming, this technique also requires the moisture of mixed coal to be adjusted to 8% left and right, has increased water transfer technique and increasing device operation easier; In briquetted coal blending coking process, exceptionally also to increase and join cakingagent technique except heating to coal, adjust water saving art operation, increase technological operation flow process, and reduced equipment reliability of operation.
Briquetted coal blending coking process will be allocated a certain proportion of cakingagent into, makes the corresponding increase of its cost, meanwhile, and because the blending device reliability of operation of allocating into of cakingagent is affected; Although briquetted coal blending coking process furnace coal weight increases, coking time also increases accordingly, does not improve coke oven output; During with the increase coking of the moulded coal amount of allocating into, in stove, briquette increases the swelling pressure of furnace wall, can affect the coke oven life-span, because can causing coke pushing current, the increase of the moulded coal amount of allocating into increases simultaneously, if strong close-burning moulding coal charge, coke pushing current can sharply rise, and the steady running of equipment is had higher requirement.
In the face of the problems referred to above, therefore, in the urgent need to developing a kind of simple to operate, stable new metallurgical coke production technique, to reduce the amount of allocating into of coking coal in coal blending, and replace the technical process that improves at present coke quality.
Summary of the invention
For existing problem in existing Coal Blending Technology; the invention provides a kind of production method of new metallurgical coke; by part mixed coal is carried out after hot pressing pre-treatment; and the mixed coal that does not carry out hot pressing with another part mixes the production method of production metallurgy coke afterwards; this process operation is simple and be easy to practical application; in the situation that not changing mixed coal proportioning; effectively improve coke quality; reactivity reduction, the post-reaction strength of coke are increased; both protect high-quality caking coal, reduced again the production cost of coke.
Concrete technical scheme of the present invention is:
A kind of production method of metallurgical coke, comprise coal blending and coking, it is characterized in that: will be mixed into after mixed coal from the coal of coal blending groove, 10%-40% ratio is sent into hot-press arrangement and is carried out hot pressing and make hot wafering by mass percentage, after again this hot wafering being pulverized, the mixed coal that does not carry out hot pressing with another part carries out after batch mixing, then sends into coke oven and carry out coking operation.
Concrete hot press operation condition is as follows:
(1) utilize the temperature range of medium and high temperature to be prepared hot wafering, be especially more conducive to the preparation of hot wafering at middle warm area.The suitable temperature range of preparing hot wafering is 300-650 DEG C, and being particularly useful for temperature is 380-430 DEG C of interval;
(2) hot press operation pressure: 5-30MPa;
(3) residence time of hot wafering under hot press operation pressure: in 5 seconds.
After hot press operation, the diameter 10-40mm of hot wafering, height 5-30mm; The density of hot wafering is 1000-1200kg/m
3.
Hot wafering after crushed, grinding particle size: <3mm;
Described hot wafering is pulverized by shredding unit.
After described hot wafering is pulverized, do not carry out the mixed coal batch mixing of hot pressing by e Foerderanlage and another part.
Improve making firm by ramming and joining moulded coal metallurgical coke production technique and compare of coke quality with existing, the production technique of utilizing part hot wafering to carry out metallurgical coke as mixed coal has significant advantage.Impressed pressure of the present invention and thermal source, utilize plastic mass that in coal, self separates out by coal compacting cohere into that density is large, intensity better and there is certain fragility, it is to utilize coal to be heated the plastic mass self separated out as cakingagent at middle and high warm area that the hot wafering of being convenient to follow-up grinding and processing utilization participates in coal blending coking technology, has saved and has added equipment and the technique that cakingagent adopts; In addition, at middle and high warm area, the moisture in coal is all separated out, and therefore, without the impact of considering moisture, has save coal damping equipment; Hot wafering enters after coke oven in participation coal blending, because itself is without moisture, coking time is shortened, in addition, due to the increase of hot wafering density, making increases into stove coal density, shorten because the double influence of this two aspect makes the coke oven single hole operating time, coke oven ultimate production increases.Outstanding feature of the present invention is not change under the prerequisite of coal blending kind, adopts heat pressing process to carry out pre-treatment to part mixed coal, thereby improves coke quality, makes 4～9 percentage points of reactivity reductions, the post-reaction strength of coke increase by 4～12 percentage points.This technological operation is simple, is easy to suitability for industrialized production, has improved coke quality, has solved in existing process of coking and has allocated the problem of cohering by force coal in a large number into for meeting coke quality.
Brief description of the drawings
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
Technical process is as Fig. 1, a mixed coal part is sent into hot-press arrangement and is carried out hot pressing and make hot wafering, be crushed to by shredding unit and be less than 3mm granularity, carry out, after batch mixing, delivering to coal bunker by e Foerderanlage and with another part mixed coal, pack coke oven into by coal charger and carry out coking operation.The coking final temperature of coke is 1050 DEG C, and the coking time is 16h.Detect by standard GB/T/T400-1996 STRENGTH ON COKE reactivity and post-reaction strength.Specific embodiment is as follows:
Embodiment 1
Mixed coal ratio: bottle coal 10%, 1/3 coking coal 25%, rich coal 25%, coking coal 30%, lean coal 10%, entering hot wafering ratio in stove coal is 40%, granularity <3mm; Hot pressing temperature: 410 DEG C; Hot pressing pressure 10MPa; Hot wafering density 1120kg/m
3; Under hot press operation pressure, stopped for 5 seconds; The diameter of hot wafering is 30mm, height 10mm; After hot wafering is mixed with mixed coal, pack top dress coke oven into and carry out coking.The reactivity of coke is 21.36%, and does not add pretreated hot wafering and adopts same coke making process gained coke to compare, and coke reactivity has reduced by 8.75 percentage points; Postreaction strength of coke is 61.16%, and does not add pretreated hot wafering and adopts same coke making process gained coke to compare, and postreaction strength of coke has increased by 11.69 percentage points.
Embodiment 2
Mixed coal ratio: bottle coal 5%, 1/3 coking coal 25%, rich coal 30%, coking coal 30%, lean coal 10%, entering hot wafering ratio in stove coal is 10%, granularity <1mm; Hot pressing temperature: 380 DEG C; Hot pressing pressure 30MPa; Hot wafering density 1180kg/m
3; Under hot press operation pressure, stopped for 5 seconds; The diameter of hot wafering is 40mm, height 30mm; After hot wafering is mixed with mixed coal, pack top dress coke oven into and carry out coking.The reactivity of coke is 23.91%, and does not add pretreated hot wafering and adopts same coke making process gained coke to compare, and coke reactivity has reduced by 5.65 percentage points; Postreaction strength of coke is 57.18%, and does not add pretreated hot wafering and adopts same coke making process gained coke to compare, and postreaction strength of coke has increased by 3.96 percentage points.
Embodiment 3
Mixed coal ratio: bottle coal 10%, 1/3 coking coal 25%, rich coal 25%, coking coal 30%, lean coal 10%, entering hot wafering ratio in stove coal is 20%, granularity <200 order; Hot pressing temperature: 430 DEG C; Hot pressing pressure 5MPa; Hot wafering density 1020kg/m
3; Under hot press operation pressure, stopped for 5 seconds; The diameter of hot wafering is 30mm, height 10mm; After hot wafering is mixed with mixed coal, pack top dress coke oven into and carry out coking.The reactivity of coke is 23.94%, and does not add pretreated hot wafering and adopts same coke making process gained coke to compare, and coke reactivity has reduced by 6.35 percentage points; Postreaction strength of coke is 58.65%, and does not add pretreated hot wafering and adopts same coke making process gained coke to compare, and postreaction strength of coke has increased by 8.29 percentage points.
Embodiment 4
Mixed coal ratio: bottle coal 5%, 1/3 coking coal 25%, rich coal 30%, coking coal 30%, lean coal 10%, entering hot wafering ratio in stove coal is 30%, granularity <3mm; Hot pressing temperature: 420 DEG C; Hot pressing pressure 10MPa; Hot wafering density 1140kg/m
3; After hot wafering is mixed with mixed coal, pack top dress coke oven into and carry out coking.The reactivity of coke is 25.88%, and does not add pretreated hot wafering and adopts same coke making process gained coke to compare, and coke reactivity has reduced by 4.00 percentage points; Postreaction strength of coke is 60.40%, and does not add pretreated hot wafering and adopts same coke making process gained coke to compare, and postreaction strength of coke has increased by 11.60 percentage points.
Claims (6)
1. the production method of a metallurgical coke, comprise coal blending and coking, it is characterized in that: will be mixed into after mixed coal from the coal of coal blending groove, 10%-40% ratio is sent into hot-press arrangement and is carried out hot pressing and make hot wafering by mass percentage, after again this hot wafering being pulverized, the mixed coal that does not carry out hot pressing with another part carries out after batch mixing, then sends into coke oven and carry out coking operation; Hot pressing temperature is 300-650 DEG C; Hot pressing pressure is 5-30MPa; The residence time under hot press operation pressure is in 5 seconds.
2. the production method of metallurgical coke according to claim 1, is characterized in that: hot pressing temperature is 380-430 DEG C.
3. the production method of metallurgical coke according to claim 1 and 2, is characterized in that: after hot press operation, and the diameter 10-40mm of hot wafering, height 5-30mm; The density of hot wafering is 1000-1200kg/m
3.
4. the production method of metallurgical coke according to claim 1 and 2, is characterized in that: hot wafering after crushed, grinding particle size <3mm.
5. the production method of metallurgical coke according to claim 1 and 2, is characterized in that: described hot wafering is pulverized by shredding unit.
6. the production method of metallurgical coke according to claim 1 and 2, is characterized in that: after described hot wafering is pulverized, do not carry out the mixed coal batch mixing of hot pressing by e Foerderanlage and another part.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104593028A (en) * | 2015-01-15 | 2015-05-06 | 安徽工业大学 | Method for producing high-quality metallurgical coke by using coal and rock indexes |
| CN105567269A (en) * | 2015-12-21 | 2016-05-11 | 武钢集团昆明钢铁股份有限公司 | Adhesive-free briquette coking method |
| CN107523319A (en) * | 2017-08-15 | 2017-12-29 | 宝钢集团新疆八钢铁有限公司 | A kind of method that coking increases high-quality gas rich coal amount of allocating |
| CN110295049A (en) * | 2019-07-09 | 2019-10-01 | 鞍钢股份有限公司 | Coking and coal blending method for efficiently utilizing complex mixed coal |
| CN111621314A (en) * | 2020-06-11 | 2020-09-04 | 河北中煤旭阳能源有限公司 | Tamping coal blending coking method |
| CN113046106A (en) * | 2021-03-15 | 2021-06-29 | 杜玉婷 | Processing device and method for improving bulk density of coal fed into furnace |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104593028A (en) * | 2015-01-15 | 2015-05-06 | 安徽工业大学 | Method for producing high-quality metallurgical coke by using coal and rock indexes |
| CN105567269A (en) * | 2015-12-21 | 2016-05-11 | 武钢集团昆明钢铁股份有限公司 | Adhesive-free briquette coking method |
| CN107523319A (en) * | 2017-08-15 | 2017-12-29 | 宝钢集团新疆八钢铁有限公司 | A kind of method that coking increases high-quality gas rich coal amount of allocating |
| CN110295049A (en) * | 2019-07-09 | 2019-10-01 | 鞍钢股份有限公司 | Coking and coal blending method for efficiently utilizing complex mixed coal |
| CN111621314A (en) * | 2020-06-11 | 2020-09-04 | 河北中煤旭阳能源有限公司 | Tamping coal blending coking method |
| CN113046106A (en) * | 2021-03-15 | 2021-06-29 | 杜玉婷 | Processing device and method for improving bulk density of coal fed into furnace |
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