CN105925294B - The control method of coke size uniformity - Google Patents
The control method of coke size uniformity Download PDFInfo
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- CN105925294B CN105925294B CN201610320854.7A CN201610320854A CN105925294B CN 105925294 B CN105925294 B CN 105925294B CN 201610320854 A CN201610320854 A CN 201610320854A CN 105925294 B CN105925294 B CN 105925294B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
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- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
Abstract
The invention discloses a kind of control methods of coke size uniformity.This method comprises the following steps: 1) determining Coal Blending Schemes are as follows: 5~30%, 1/3 coking coal 15~30% of bottle coal, rich coal 5~20%, coking coal 20~50%, lean coal 3~15%；2) gradation for controlling mixed coal meets each grade in mixed coal: 2.1) grade >=3mm moiety weight percentage≤25%, wherein grade >=5mm moiety weight percentage≤5%, 3mm≤grade < 5mm moiety weight percentage 5~25%；2.2) 0.5mm≤grade < 3mm moiety weight percentage 40~50%, wherein 1mm≤grade < 3mm moiety weight percentage 10~25%, 0.5mm≤grade < 1mm moiety weight percentage 20~35%；2.3) grade < 0.5mm moiety weight percentage >=35%；3) enter furnace coking.The present invention is rationally controlled by reasonable coal blending and to the gradation of mixed coal, can be formed in coking tightly packed, reduces the porosity of coke, is conducive to the normal generation and extension of coke crackle, to obtain even-grained coke.
Description
Technical field
The invention belongs to metallurgical coking technology fields, and in particular to a kind of control method of coke size uniformity.
Background technique
The uniformity of coke size composition influences the gas permeability of blast furnace, and coke size is uniform, then porosity is high between coke,
Blast furnace permeability is good.Coke layer good permeability, correspondingly, the gas permeability of blast furnace soft melt zone are also good, grain when coke reaches cupola well
Degree is also unlikely too small, too small to cause hearth accumulation.As it can be seen that coking production process blending ratio and mixed coal granularmetric composition are really
It is fixed, in addition to being necessary to ensure that obtain certain coke strenth, it is also necessary to obtain the uniform coke of certain particle size.
For the uniformity for realizing coke size, the prior art is to be crushed to grain using coking with dry coal and supplying certain proportion
Degree≤0.4mm part accounts for 90% or more, vitrinite and is averaged maximum reflectivityFor >=2.0%, coking optical texture
100% is the coal of inert component.The uniformity of coke size is realized according to the prior art, there are following limitations: 1) using dry
Dry coal coking is coking coal to be dried pretreatment, needs to build the drying device of coking coal.2) supplying certain proportion crushes
90% or more, vitrinite is accounted for≤0.4mm grade part to be averaged maximum reflectivityFor >=2.0%, coking optical texture knot
Structure 100% is the coal of inert component, and it is finely divided to coal progress to need in addition to build ultrafine crusher.Therefore, existing reality
The construction investment of existing coke size uniformity method is larger.
Summary of the invention
Simple, lower-cost coke size uniformity that technical problem to be solved by the invention is to provide a kind of methods
Control method.In the present invention, indicates that the amount of coke size uniformity is set as coke size uniformity coefficient, indicated with K, and
It enables:
K=100000/ [(100-P)2* (it is more than or equal to 80mm grade coke proportion)+(70-P)2* (60~80mm
Grade coke proportion)+(50-P)2* (40~60mm grade coke proportion)+(32.5-P)2* (25~40mm grade coke
Proportion)+(12.5-P)2* (it is less than 25mm grade coke proportion)]；
Wherein P represents coke average particle size, and P=(is more than or equal to 80mm grade coke proportion * 100+60~80mm
Grade coke proportion * 70+40~60mm grade coke proportion * 50+25~40mm grade coke proportion * 32.5
+ it is less than 25mm grade coke proportion * 12.5)/100；
Ratio shared by the bigger amount of coke for indicating deviation average particle size of K value is smaller, i.e., gets over close to the coke of average particle size
More, then the uniformity of coke is better, the voidage between coke can be bigger.
In order to solve the above technical problems, the present invention adopts the following technical scheme that:
A kind of control method of coke size uniformity, includes the following steps:
1) Coal Blending Schemes are determined are as follows: 5~30%, 1/3 coking coal 15~30% of bottle coal, rich coal 5~20%, coking coal 20~
50%, lean coal 3~15%；
2) gradation for controlling mixed coal meets each grade in mixed coal:
2.1) grade >=3mm moiety weight percentage≤25%, wherein grade >=5mm moiety weight percentage≤5%,
3mm≤grade < 5mm moiety weight percentage 5~25%；
2.2) 0.5mm≤grade < 3mm moiety weight percentage 40~50%, wherein 1mm≤grade < 3mm moiety by weight
Percentage 10~25%, 0.5mm≤grade < 1mm moiety weight percentage 20~35%；
2.3) grade < 0.5mm moiety weight percentage >=35%；
3) enter furnace coking.
Further, in the step 1), 10~20%, 1/3 coking coal 20~25% of bottle coal, rich coal 10~15%, coking coal
30~45%, lean coal 5~10%.
The present inventor is by the discovery that studies for a long period of time, in the middle and later periods of coking, due to layered coking, phase in carbonization chamber
Adjacent semicoke interlayer temperature gradient and contraction speed have differences, and generate shrinkage stress, lead to the generation and development of coke crackle.Its
In, coarse coal intragranular portion consistency is high, and mostly with Covalent bonding together, covalent bond energy is much larger than intermolecular attraction, works as phase structure synusia
There are when coarse coal grain at adjacent semicoke bed boundary, coarse coal grain can hinder the development of crackle, cause coke size bigger than normal, while burnt
Block Surface regularity is poor.And the stomata of coke influences the development of crackle, the high coke bulk coke ratio example of the porosity is high, and coke is uniform
Property is poor.The present invention is rationally controlled by reasonable coal blending and to the gradation of mixed coal, and compact reactor can be formed in coking
Product, reduces the porosity of coke, to be conducive to the normal generation and extension of coke crackle, avoids hindering because of excessive bulky grain
Coke size unevenness homogenizes caused by the extension of crackle.Coal-blending coking is carried out according to the method for the present invention, in no coal damping, without type
Coal, under the conditions of 4.3 meters or more top dress coke oven dry coke quenching of tradition, hot strength of coke CSR obtained by the method for the present invention 65~72%,
M40 in 87~90%, M10 5.5~6.5%, coke size coefficient of uniformity K >=3%.
Specific embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
There are 5 kinds of coking coal resources in certain factory, and number is A mine-gas coal, 1/3 coking coal of B mine, C mine rich coal, D mine coking coal and E respectively
Mine lean coal.
Determine Coal Blending Schemes, specific each single grade coal and proportion are shown in Table 1.
The Coal Blending Schemes of 1 Examples 1 to 4 of table
| Coal | A mine-gas coal | 1/3 coking coal of B mine | C mine rich coal | D mine coking coal | E mine lean coal |
| Adapted weight percent/% | 10 | 20 | 20 | 40 | 10 |
The gradation of mixed coal is controlled, each grain class distribution is specifically shown in Table 2 in the mixed coal of Examples 1 to 4.
The amount for indicating coke size uniformity is set as coke size uniformity coefficient, is indicated with K, and enable:
K=100000/ [(100-P)2* (it is more than or equal to 80mm grade coke proportion)+(70-P)2* (60~80mm
Grade coke proportion)+(50-P)2* (40~60mm grade coke proportion)+(32.5-P)2* (25~40mm grade coke
Proportion)+(12.5-P)2* (it is less than 25mm grade coke proportion)]；
Wherein P represents average particle size, and P=(is more than or equal to 80mm grade coke proportion * 100+60~80mm grade
Coke proportion * 70+40~60mm grade coke proportion * 50+25~40mm grade coke proportion * 32.5+ is small
In 25mm grade coke proportion * 12.5)/100.
The amount of each grade in the mixed coal of 2 Examples 1 to 4 of table
The average particle size P and epigranular property coefficient of the coke of Examples 1 to 4 are specifically shown in table 3.
The coke size of 3 Examples 1 to 4 of table forms and epigranular property coefficient
As can be seen from Table 2: in embodiment 1, grade >=3mm moiety weight percentage reaches 34.06% in mixed coal,
0.5mm≤grade < 3mm grade weight percent is 37.69%, and grade < 0.5mm moiety weight percentage is 28.25%, no
Meet technical solution of the present invention 3) in mixed coal gradation technical indicator range, from table 3 it can be seen that coking obtained by coke size
Uniformity is poor, and uniformity coefficient K value is 2.57.In embodiment 2, mixed coal gradation is also unsatisfactory for technical solution of the present invention 3) in
The technical indicator range of mixed coal gradation, coking gained coke size uniformity is also poor, and uniformity coefficient K value is 2.65.It is real
Apply in example 3 and embodiment 4, mixed coal gradation is all satisfied technical solution of the present invention 3) in mixed coal gradation technical indicator range,
Coke size uniformity obtained by coking is good, and uniformity coefficient K value is respectively 3.05 and 3.36.
Claims (2)
1. a kind of control method of coke size uniformity, it is characterised in that: this method comprises the following steps:
1) Coal Blending Schemes are determined are as follows: 5~30%, 1/3 coking coal 15~30% of bottle coal, rich coal 5~20%, coking coal 20~50% are thin
Coal 3~15%；
2) gradation for controlling mixed coal meets each grade in mixed coal:
2.1) grade >=3mm moiety weight percentage≤25%, wherein grade >=5mm moiety weight percentage≤5%, 3mm≤
Grade < 5mm moiety weight percentage 5~25%；
2.2) 0.5mm≤grade < 3mm moiety weight percentage 40~50%, wherein 1mm≤grade < 3mm moiety by weight percentage
Than 10~25%, 0.5mm≤grade < 1mm moiety weight percentage 20~35%；
2.3) grade < 0.5mm moiety weight percentage >=35%；
3) enter furnace coking.
2. the control method of coke size uniformity according to claim 1, it is characterised in that: in the step 1), gas
10~20%, 1/3 coking coal 20~25% of coal, rich coal 10~15%, coking coal 30~45%, lean coal 5~10%.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110591748B (en) * | 2019-09-29 | 2021-03-09 | 武汉钢铁有限公司 | Coal blending method for controlling and improving coke granularity |
| CN115141665B (en) * | 2021-03-29 | 2024-06-04 | 上海梅山钢铁股份有限公司 | Coke matched with Australian gas coal and coking method |
| CN113845933B (en) * | 2021-09-08 | 2023-08-18 | 武汉钢铁有限公司 | Method for detecting and adjusting coking coal granularity |
| CN114479892B (en) * | 2022-01-22 | 2023-03-28 | 太原理工大学 | Coal blending method for preparing high-strength low-reactivity coke |
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| CN102994129A (en) * | 2012-12-03 | 2013-03-27 | 广东韶钢松山股份有限公司 | Gas coal blended coking blending coal and preparation method thereof |
| CN102994130A (en) * | 2012-12-25 | 2013-03-27 | 河北联合大学 | Method for coal blending for coking by high-metamorphic-grade weak caking coal |
| CN103205270A (en) * | 2012-01-11 | 2013-07-17 | 上海梅山钢铁股份有限公司 | Long flame coal size grading control method |
| CN104140833A (en) * | 2014-07-11 | 2014-11-12 | 武汉钢铁(集团)公司 | Coal-blending and coke-making method involved with low G value 1/3 coking coal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6007958B2 (en) * | 2014-09-22 | 2016-10-19 | 新日鐵住金株式会社 | Coke production method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103205270A (en) * | 2012-01-11 | 2013-07-17 | 上海梅山钢铁股份有限公司 | Long flame coal size grading control method |
| CN102994129A (en) * | 2012-12-03 | 2013-03-27 | 广东韶钢松山股份有限公司 | Gas coal blended coking blending coal and preparation method thereof |
| CN102994130A (en) * | 2012-12-25 | 2013-03-27 | 河北联合大学 | Method for coal blending for coking by high-metamorphic-grade weak caking coal |
| CN104140833A (en) * | 2014-07-11 | 2014-11-12 | 武汉钢铁(集团)公司 | Coal-blending and coke-making method involved with low G value 1/3 coking coal |
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