CN101717653A - Treatment method before carbonizing coking coal - Google Patents
Treatment method before carbonizing coking coal Download PDFInfo
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- CN101717653A CN101717653A CN200910311262A CN200910311262A CN101717653A CN 101717653 A CN101717653 A CN 101717653A CN 200910311262 A CN200910311262 A CN 200910311262A CN 200910311262 A CN200910311262 A CN 200910311262A CN 101717653 A CN101717653 A CN 101717653A
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Abstract
The invention relates to a treatment method before carbonizing coking coal, which comprises the steps of drying, screening and treating. The treatment method can divide the coal into three granules such as coarse granule coal, charging coal and dust coal, so that the coking coal has good quality and high yield, and the step of drying can dry the charging coal to have ideal water content, therefore, the drying time is shortened.
Description
Technical field:
The present invention relates to a kind of to the treatment process of coking coal before charing.
Background technology:
In the prior art, coking coal is entering the preceding common operations such as process coal washing, coal blending, pulverizing, storage coal or coal washing, pulverizing, coal blending, storage coal that need of coking chamber (coke oven), in these operations, coal washing be utilize water directly the mode of flushing remove or reduce the ash content in the coal and remove other impurity; Coal blending is to mix multiple, to enlarge the use range of coking coal, reasonably utilizes resource; Pulverizing is in order to make the shove charge coal can reach suitable bulk density, to improve the quality and the output of coke.From above-mentioned technological process as can be seen, coking coal can not be regulated the water content of coal effectively and remove coal dust (particle is below 0.5mm) effectively before entering coking chamber.
According to existing shove charge coal is carried out sampling analysis, after coarse breaking, enter before the pulverizer in the feed coal less than 0.5mm coal dust content generally up to 34%, behind pulverizer less than 0.5mm coal dust content up to 43%.The problem that coal dust content height at first reflects in the shove charge coal is to control the water content of shove charge coal by standard, because the coal dust that water content is lower is easy to generate detonation under hot environment, the detonation meeting directly causes the coal dust burning, this not only wastes coal resource, but also can easily cause the work-ing life of damaging or reducing coke oven to coke oven; Next is that the quality of blast-furnace coke quality depends primarily on its physical strength and these two leading indicators of post-reaction strength; and the principal element that influences these two indexs is the air hole structure of coke; air vent wall intensity, coke crackle and charred coal organization; these factor coke removal optical textures depend on outside the inherent nature of coal; other several factors depend primarily on the shove charge coal particle and whether evenly reach degree of refinement; simultaneously, grain refined shove charge coal can also improve the output of coke.The optimal scope of the size-grade distribution of shove charge coal be particle diameter between 0.5-3mm, higher limit should be formed and factor such as bulk density determines that in conjunction with the maximum principle of bulk density, fineness is about 78% with reference to the feed coal petrofacies; In addition, coal dust is easy to directly be drawn in chemical products treatment facility and the induced draft fan by induced draft fan after entering the carbonization chamber, cause induced draft fan to wear and tear too early on the one hand, can reduce the work-ing life that is worth several ten million yuan of induced draft fans, can influence chemical products production and quality on the other hand.
The shove charge coal will could form coke through super-dry → gelatinous layer → semicoke → coke step in entering coke oven, length time of drying wherein depends on the water content of shove charge coal, and promptly its water content is low more, and time of drying is short more, and is energy-conservation more; The coal of shove charge simultaneously water content height can produce gases such as carbon monoxide and carbonic acid gas in the exsiccant process, these gases are easy to corrode alkaline furnace wall after forming the carbonic acid ion, and reduced the work-ing life of pit kiln; Detect according to another the scene, if shove charge coal water content is controlled at 7%, coke oven is used for exsiccant coal gas consumption and CO2 emissions has reduced 34% than water content at the shove charge coal more than 10%.
Prior art also has certain understanding to the water content of shove charge coal, is called " coking coal hot air blowing grading and moisture controlled coal preparation technology " and just proposes a solution as the name of No. 1100112 Granted publications of Chinese patent.This coal preparation technology has disclosed a kind of fluidised bed drying technology, and making coal can be 200 ℃ in temperature--600 ℃ of atmosphere inner dryings and classification.Yet, with regard to regard to the screening plant of pit kiln screening coking coal, require screening plant per hour can sieve out granularity 3 millimeters with 500 tons of interior coking coals to thousands of tons of, for the coal that is dried, if its size ratio is more even, in certain residence time, may reach the desired ridity of fluidisation, but, under the big situation of the particle size distribution of coal, the macrobead thing is because of can not get dry fully being trapped on the gas distribution grid, so it is very high to use this kind screening plant that the pulverizing program is required, and also needs to consume a large amount of heat energy and keep work; Simultaneously, high-temperature gas corrodes the gas distribution grid of fluidized-bed easily, needs expensive time and expense and change gas distribution grid.
Summary of the invention:
The purpose of this invention is to provide a kind ofly to the treatment process before the carbonizing coking coal, the coal that utilizes this method to handle can effectively be controlled its water content and coal dust content.
Treatment process before the carbonizing coking coal proposed by the invention comprises drying: will be sent in the container through the coal behind coal blending or the pulverizing process, and make coal utilize hot blast that it is carried out convection drying in the process of flowing in container; Screening: after drying coal is sieved, make the coal after the screening be divided into this three classes coal of coarse particles coal, shove charge coal and dust coal; Handle: the coarse particles coal is sent in the pulverizer pulverizes again, the shove charge coal is sent into coal-storage room or is directly sent in the pit kiln, sends into coal-storage room or directly sends into these three steps in the pit kiln after the dust coal is made pelletizing.Convection drying promptly is to utilize and the angled hot blast injection coal of coal falling direction, makes coal can move a section along with the track of hot blast and moves the whereabouts, back, and in this process, hot blast directly contacts with coal particle, can take away by the moisture that it is surperficial.
Treatment process before the carbonizing coking coal proposed by the invention comprises screening: will be through coal blending or the coal after pulverizing sieve, make the coal after the screening be divided into this three classes coal of coarse particles coal, shove charge coal and dust coal; Dry: that the shove charge coal utilization hot blast after screening is carried out convection drying; Handle: the coarse particles coal is sent in the pulverizer pulverizes again, dry back shove charge coal is sent into coal-storage room or is directly sent in the pit kiln, sends into coal-storage room behind the pelletizing or directly sends in the pit kiln and the dust coal made.
Also comprise primary dcreening operation step by step before the described drying step.In drying step, hot air source is selected former coke-oven chimney institute exhaust gas discharged for use.After drying step was finished, the water content of shove charge coal was between 4%-8%.
In the described screening step, adopt the mode of mechanical grading to obtain coarse particles coal and shove charge coal, adopt the mode of negative pressure-pumping and cyclonic separation to obtain the dust coal.Cyclonic separation is as a kind of common separation stage division, and its principle of work is centrifugal settling (as a swirler), and it can be with coal dust and the air separation of quality greater than air, thereby finishes the screening to coal dust.
Proposed by the invention to its coal being divided into these three kinds of particles of coarse particles coal, shove charge coal and dust coal in the treatment process before the carbonizing coking coal, coarse particles coal wherein can be sent in the pulverizer again and pulverize, handle with present method again, and the dust coal is sent in pit kiln or the coal-storage room after can directly making coal briquette again, so, the coke quality that adopts this method to produce to come is good, output also increases, and is fully utilized energy-conservation because of the dust coal; Drying program can be dried to the shove charge coal ideal moisture content, and in process of coking, time of drying, length depended on the water content of shove charge coal, and promptly its water content is low more, and time of drying is short more, and is energy-conservation more; The coal of shove charge simultaneously water content height can produce gases such as carbon monoxide and carbonic acid gas in the exsiccant process, these gases are easy to corrode alkaline furnace wall after forming the carbonic acid ion, and reduced the work-ing life of pit kiln; Detect according to another the scene, if shove charge coal water content is controlled at 7%, coke oven is used for exsiccant coal gas consumption and CO2 emissions has reduced 34% than water content at the shove charge coal more than 10%.
Embodiment:
Embodiment 1:
At first will be sent to through the coal behind coal blending or the pulverizing process in the container, and make coal in container, carry out convection drying to it in the process of flowing, the required hot air source of convection drying is taken from former coke-oven chimney institute exhaust gas discharged, in drying process, hot blast is acted directly on the coal of mobile or rotational flow; Then after drying coal is sieved, and in the screening step, adopt mechanical picker to obtain coarse particles coal on the sieve and sieve shove charge coal down, adopt the mode of negative pressure-pumping to obtain the dust coal simultaneously; The coarse particles coal is sent in the pulverizer pulverizes again, the shove charge coal is sent into coal-storage room or is directly sent in the pit kiln, sends into coal-storage room behind the pelletizing or directly sends in the pit kiln and the dust coal made.
Embodiment 2:
Method according to embodiment 1 is carried out drying and screening to the coal behind coal blending or pulverizing process, and to the processing of coarse particles coal, shove charge coal, dust coal, and after drying step was finished, the water content that can make the shove charge coal was between 4%-8%.
Embodiment 3:
Method according to embodiment 1 is carried out drying and screening to the coal behind coal blending or pulverizing process, and to the processing of coarse particles coal, shove charge coal, dust coal, and before drying step, also comprise primary dcreening operation step by step, the coal that is about to behind coal blending or pulverizing process sieves out the large coal particles on the sieve and sieves coal down with sieve earlier, and the large coal particles that directly will sieve delivers in the pulverizer and pulverizes, and coal carries out drying again and screening is handled to sieving down.
Embodiment 4:
Method described in present embodiment and the embodiment 1 is basic identical, and different is, and present embodiment sieves according to the method for embodiment 1 coal behind coal blending or pulverizing process earlier, and then according to the method for embodiment 1 to carrying out drying and processing.
Embodiment 5:
Method described in present embodiment and the embodiment 1 is basic identical, and different is in drying step, utilizes hot blast to drive coal in the mode that rotatablely moves and rotates together, to prolong the time that coal contacts with hot blast, realizes better drying effect.
Embodiment 6:
Method described in present embodiment and the embodiment 1 is basic identical, different is in drying step, coal is dropped on container or the parts, coal can be disperseed on container or parts, and then utilize hot blast to drive the dispersive coal and rotate together in the mode that rotatablely moves, to prolong the time that coal contacts with hot blast, realize better drying effect.
Claims (6)
1. the treatment process before the carbonizing coking coal is characterized in that may further comprise the steps:
Dry: as will to be sent in the container through the coal behind coal blending or the pulverizing process, and to make coal in container, utilize hot blast that it is carried out convection drying in the process of flowing;
Screening: after drying coal is sieved, make the coal after the screening be divided into this three classes coal of coarse particles coal, shove charge coal and dust coal;
Handle: the coarse particles coal is sent in the pulverizer pulverizes again, the shove charge coal is sent into coal-storage room or is directly sent in the pit kiln, sends into coal-storage room behind the pelletizing or directly sends in the pit kiln and the dust coal made.
2. the treatment process before the carbonizing coking coal is characterized in that may further comprise the steps:
Screening: will sieve through the coal behind coal blending or the pulverizing process, make the coal after the screening be divided into this three classes coal of coarse particles coal, shove charge coal and dust coal;
Dry: that the shove charge coal utilization hot blast after screening is carried out convection drying;
Handle: the coarse particles coal is sent in the pulverizer pulverizes again, dry back shove charge coal is sent into coal-storage room or is directly sent in the pit kiln, sends into coal-storage room behind the pelletizing or directly sends in the pit kiln and the dust coal made.
3. treatment process according to claim 1 is characterized in that: also comprise primary dcreening operation step by step before the described drying step.
4. treatment process according to claim 1 and 2 is characterized in that: in the described drying step, hot air source is selected former coke-oven chimney institute exhaust gas discharged for use.
5. treatment process according to claim 1 and 2 is characterized in that: after described drying step was finished, the water content of shove charge coal was between 4%-8%.
6. treatment process according to claim 1 and 2 is characterized in that: in the described screening step, adopt the mode of mechanical grading to obtain coarse particles coal and shove charge coal, adopt the mode of negative pressure-pumping and cyclonic separation to obtain the dust coal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200910311262A CN101717653A (en) | 2009-12-11 | 2009-12-11 | Treatment method before carbonizing coking coal |
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| CN200910311262A CN101717653A (en) | 2009-12-11 | 2009-12-11 | Treatment method before carbonizing coking coal |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102676193A (en) * | 2012-05-11 | 2012-09-19 | 无锡亿恩科技股份有限公司 | Humidifying process for high-moisture charged coking coal |
| CN104140832A (en) * | 2013-05-10 | 2014-11-12 | 山东钢铁集团日照有限公司 | Technology for improving quality stability of coking charge coal |
| CN104327870A (en) * | 2014-10-14 | 2015-02-04 | 辽宁中弘信冶金技术有限公司 | Coking coal production method and coking coal |
| TWI551675B (en) * | 2014-05-19 | 2016-10-01 | Jfe Steel Corp | Coke manufacturing methods and coke as well as mixed coal homogeneity Evaluation method |
| CN106221717A (en) * | 2016-08-15 | 2016-12-14 | 天津大学 | The drying means of coking coal and device in a kind of coking industry |
| CN110305680A (en) * | 2019-04-12 | 2019-10-08 | 武汉钢铁有限公司 | Coking process that is a kind of easy to operate and determining moisture-free coal proportion speed |
| 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 |
| CN110903833A (en) * | 2019-11-11 | 2020-03-24 | 唐山中润煤化工有限公司 | Method for improving yield of top-loading coke oven |
| CN111308042A (en) * | 2020-02-26 | 2020-06-19 | 武汉科技大学 | Coking and coal blending method |
-
2009
- 2009-12-11 CN CN200910311262A patent/CN101717653A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102676193A (en) * | 2012-05-11 | 2012-09-19 | 无锡亿恩科技股份有限公司 | Humidifying process for high-moisture charged coking coal |
| CN104140832A (en) * | 2013-05-10 | 2014-11-12 | 山东钢铁集团日照有限公司 | Technology for improving quality stability of coking charge coal |
| TWI551675B (en) * | 2014-05-19 | 2016-10-01 | Jfe Steel Corp | Coke manufacturing methods and coke as well as mixed coal homogeneity Evaluation method |
| CN104327870A (en) * | 2014-10-14 | 2015-02-04 | 辽宁中弘信冶金技术有限公司 | Coking coal production method and coking coal |
| CN106221717A (en) * | 2016-08-15 | 2016-12-14 | 天津大学 | The drying means of coking coal and device in a kind of coking industry |
| CN106221717B (en) * | 2016-08-15 | 2019-08-20 | 天津大学 | The drying means and device of coking coal in a kind of coking industry |
| CN110305680A (en) * | 2019-04-12 | 2019-10-08 | 武汉钢铁有限公司 | Coking process that is a kind of easy to operate and determining moisture-free coal proportion speed |
| CN110305680B (en) * | 2019-04-12 | 2020-10-16 | 武汉钢铁有限公司 | Coking method with simple operation and accurate determined dry coal ratio |
| 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 |
| CN110484288B (en) * | 2019-08-23 | 2020-07-03 | 山西沁新能源集团股份有限公司 | Coking and coal blending method |
| CN110903833A (en) * | 2019-11-11 | 2020-03-24 | 唐山中润煤化工有限公司 | Method for improving yield of top-loading coke oven |
| CN111308042A (en) * | 2020-02-26 | 2020-06-19 | 武汉科技大学 | Coking and coal blending method |
| CN111308042B (en) * | 2020-02-26 | 2022-04-15 | 武汉科技大学 | Coking and coal blending method |
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Application publication date: 20100602 |