CN103194248A - Coal blending and coking method capable of increasing coke granularity - Google Patents

Abstract

The invention discloses a coal blending and coking method capable of increasing the coke granularity. The method comprises the following steps of: 1) detecting the industrial analysis index and gelatinous layer index of coking coal to obtain the volatile component Vdaf and a final shrinkage degree X, wherein the volatile component Vdaf is less than 24 percent, and the dosage of the coking coal with the final shrinkage degree X less than 25mm is 40 to 50 percent; and 2) leading the dosage of lean coal to be between 12 and 16percent, the dosage of one third coking coal to be between 15 and 25 percent, and the dosage of fat coal to be between 12 and 16 percent. The method can be used for improving the coke granularity from the point of coal blending and coking, does not need to change the prior production process or add other mill coal, can be used for regulating the coke granularity by regulating the existing coal blending structure, is simple in implementation, strong in operability and low in cost.

Description

Increase the coke making and coal blending method of coke size

Technical field

The invention belongs to the coke making and coal blending technical field, be specifically related to a kind of coke making and coal blending method that increases coke size.

Background technology

Coke is the skeleton function of furnace charge to one of main effect of blast furnace ironmaking, and the ventilation property of bottom house stock column is almost completely kept by coke in the smelting process, plays the transom effect of coal gas.Suitable coke mean particle size is most important to the blast furnace stable and high yields.Guarantee blast furnace burden direct motion, ventilative, especially under the situation of oxygen-enriched coal spray, the granularity of coke must be even as far as possible.Concrete size composition is determined according to furnace volume, raw materials used situation and blast furnace operating system.Along with the increase of pulverized coal injection ratio, permeability of stock column is more crucial in blast furnace operating.Coke plays the flow of gas Distribution Layer at blast furnace.When coke size was less than normal, bed of material air permeance resistance coefficient increased, permeability deterioration.

Though used coke oven type, the quenching mode of coal chemical enterprise is the important factor that influences coke size, is limited by many condition restriction such as place, fund, in case build up, it is difficult to change.At present, the method for improving coke size mainly concentrates on the following aspects: regulate coke size (as: D. R. Jenkins, Liu Youcun [translating], Wang Siwei [check and correction] by changing heating means to control certain average fire path temperature 1.; The iron and steel collection of translations; The 1st phase in 2011).2. (as: Xu Jun, Sun Xiuhuan pay by force, Zhang Jingbo to improve coke size by materials such as adding plastic waste, coke powder, refinery coke, high-carbon material, non-coking coal; The product yield and the performance study that add the plastic waste coal-blending coking; The metallurgical energy; 2004 the 6th phases).3. by the coking new technology, technologies such as coking coal pre-treatment make coke size evenly (as: Fan Runhan, Yu Wenhua etc.; The discussion that the coal humidifying technology is used in Coal Chemical Industry company; Climb the steel technology; The 6th phase in 1999).4. improve coke size by regulating coke oven standard temperature and coking time.But because above method is to adjust by the method STRENGTH ON COKE granularity beyond the coke making and coal blending, the rectification expense is higher, and production process problem to be solved is more, and feasibility aborning is not very strong.

Summary of the invention

The object of the present invention is to provide a kind of coke making and coal blending method that increases coke size.

For solving the problems of the technologies described above, the present invention adopts following technical scheme:

A kind of coke making and coal blending method that increases coke size comprises the steps:

1) technical analysis index and the plastometer indice of mensuration coking coal are obtained volatile matter V _DafWith final contraction value X; Get volatile matter V _Daf＜24%, the adapted amount of final contraction value X＜25mm coking coal is 40 ~ 50%;

2) the adapted amount of lean coal is 12 ~ 16%; The adapted amount of 1/3 coking coal is 15～25%; The adapted amount of rich coal is 12～16%.

Further, the volatile matter V of described coking coal _Daf≤ 23%.

The present invention has following advantage: produce coal-blending coking according to above coke making and coal blending method, comparable original blending method is science, reasonable more, is conducive to improve coke size.

1) the present invention improves coke size from the coke making and coal blending angle, need not to change existing production technique, need not add other non-coking coal, by existing coal blending structure is adjusted, regulates coke size, implements simple, workable.

2) otherness of the coking coal STRENGTH ON COKE particle size influences of the present invention by utilizing different volatile matters, different shrink grading by controlling the scope of certain volatile matter and shrink grading coking coal, has more specific aim aspect the coke size improving, and does not increase cost.

3) carry out coal-blending coking by the inventive method, gained coke mean particle size is 53 ~ 58mm.

Embodiment

The present invention is described further below in conjunction with embodiment.

Existing blending method is Comparative Examples 1, and institute's coking carbon granule degree is less than normal, and method of the present invention is embodiment 1 ~ 3, institute's coking carbon granule degree appropriateness is increased, thereby it is required to satisfy production practice.

Comparative Examples 1

In this Comparative Examples, by weight, coking coal is that 45%, 1/3 coking coal is 22%, and gas-fat coal is 8%, and rich coal is 12%, and lean coal is 13%.

After measured, the volatilization of coking coal is divided into 26.59%, and shrink grading is 38mm; Coking gained coke mean particle size is 44mm.

Embodiment 1

In the present embodiment, by weight, coking coal is that 45%, 1/3 coking coal is 22%, and gas-fat coal is 8%, and rich coal is 12%, and lean coal is 13%.

Wherein, the volatilization of coking coal is divided into 23.76%, and shrink grading is 22mm; Coking gained coke size is 58mm.

Embodiment 2

In the present embodiment, by weight, coking coal is that 45%, 1/3 coking coal is 22%, and gas-fat coal is 8%, and rich coal is 12%, and lean coal is 13%.

Wherein, the volatilization of coking coal is divided into 21.09%, and shrink grading is 22mm; Coking gained coke size is 53mm.

Embodiment 3

In the present embodiment, by weight, coking coal is that 50%, 1/3 coking coal is 15%, and gas-fat coal is 5%, and rich coal is 14%, and lean coal is 16%.

Wherein, the volatilization of coking coal is divided into 21.55%, and shrink grading is 21mm; Coking gained coke size is 55mm.

Among Comparative Examples and each embodiment, except the coking coal difference, it is the identical or close single coals of planting of indexs such as source unanimity, technical analysis that Comparative Examples is planted coal (for example lean coal) with other the identical list among the different embodiment.The present inventor draws through test of many times simultaneously, as long as the volatilization of coking coal is divided into V _Daf＜24%, final contraction value is X＜25mm, and by weight, the adapted amount of coking coal is 40 ~ 50%, no matter then how other list plants its source of coal, indexs such as technical analysis how, is 12 ~ 16% as long as satisfy the adapted amount of lean coal; The adapted amount of 1/3 coking coal is 15～25%; The adapted amount of rich coal is 12～16%, can satisfy purpose of the present invention.

Claims (2)

1. a coke making and coal blending method that increases coke size is characterized in that: comprise the steps:

1) technical analysis index and the plastometer indice of mensuration coking coal are obtained volatile matter V _DafWith final contraction value X; Get volatile matter V _Daf＜24%, the adapted amount of final contraction value X＜25mm coking coal is 40 ~ 50%;

2) the adapted amount of lean coal is 12 ~ 16%; The adapted amount of 1/3 coking coal is 15～25%; The adapted amount of rich coal is 12～16%.

2. the coke making and coal blending method of increase coke size according to claim 1 is characterized in that: the volatile matter V of described coking coal _Daf≤ 23%.