CN104804755A

CN104804755A - Coal blending method for coking 1/3 coking coal having solid softening temperature interval below 85 DEG C

Info

Publication number: CN104804755A
Application number: CN201510247131.4A
Authority: CN
Inventors: 宋子逵; 薛改凤; 项茹; 张雪红; 鲍俊芳; 陈鹏; 任玉明; 詹立志; 陈细涛; 王元生
Original assignee: Wuhan Iron and Steel Group Corp
Current assignee: Wuhan Iron and Steel Co Ltd
Priority date: 2015-05-14
Filing date: 2015-05-14
Publication date: 2015-07-29
Anticipated expiration: 2035-05-14
Also published as: CN104804755B

Abstract

The invention discloses a coal blending method for coking 1/3 coking coal having a solid softening temperature interval below 85 DEG C. A coal blending scheme of the method comprises the following steps: 1), carrying out Gieseler fluidity measurement on the 1/3 coking coal, and selecting the 1/3 coking coal having the solid softening temperature interval of 70 to 85 DEG C and marking as I-type 1/3 coking coal, marking the 1/3 coking coal having the solid softening interval over 85 DEG C as other 1/3 coking coal; 2) carrying out coal blending on the I-type 1/3 coking coal according to the components in percentage by mass: 1 to 10 percent of gas-fat coal, 1 to 10 percent of fat coal, 1 to 15 percent of the I-type 1/3 coking coal, 10 to 20 percent of the other 1/3 coking coal, 40 to 45 percent of coking coal and 10 to 15 percent of lean coal; volatile components of the 1/3 coking coal having the solid softening temperature interval below 85 DEG C account for 34 percent and over. According to the coal blending method disclosed by the invention, the 1/3 coking coal is optimized and subdivided by adopting the solid softening temperature interval in Gieseler fluidity indexes in conjunction with a suitable coal blending structure, and thus a purpose of stabilizing the quality of the coking coal is achieved.

Description

Gu softening temperature interval is the coke making and coal blending method of less than 85 DEG C 1/3 coking coal

Technical field

The invention belongs to Coking Coal Blending Technology field, be specifically related to the coke making and coal blending method that a kind of solid softening temperature interval is less than 85 DEG C 1/3 coking coal.

Background technology

China's coal resource enriches, but coking coal resource is in short supply, and skewness weighs in limited coking coal resource.In the coal reserves verified, coking coal reserves only account for 26% of coal total reserves, and coking coal only accounts for 17.57% of coking coal reserves, and rich coal accounts for 10%.And in coal-blending coking, burnt rich coal generally should account for 50%-60%, between coking coal resource and the demand of coke making and coal blending, contradiction is serious.

In order to reduce the usage quantity of burnt rich coal as far as possible, reduce production cost and improve coke quality, coking worker in various countries' starts to pay attention in the applied research to non-coking coal gradually.And 1/3 coking coal is as the higher coal of content in China coal resource deposit, how makes making good use of 1/3 coking coal and especially there is realistic meaning for China's coking industry.1/3 coking coal is as the coal of a kind of metamorphic grade between coking coal and rich coal, its complexity is much more complicated than burnt rich coal, and the use of China to 1/3 coking coal depends on vitrinite reflectance and the distribution thereof of traditional coal index and coal petrography index, all there is certain defect in the combined index of these two kinds of indexs and these two kinds of indexs, reasonable employment can not be accomplished to 1/3 coking coal all sidedly because the close 1/3 coking coal quality of some coal index, coal petrography index also may difference larger.

Summary of the invention

Technical problem to be solved by this invention is to provide the coke making and coal blending method that a kind of solid softening temperature interval is less than 85 DEG C 1/3 coking coal, the inclined bottle coal of Quality of Part Coal in 34% and 1/3 above coking coal is divided into solve volatilization, according to generally using G at present, Y value measuring method effectively cannot be distinguished utilization, thus cause coal quality fluctuation to cause the problem of coke quality fluctuation.

For solving the problems of the technologies described above, Gu the present invention utilizes the Giseeler fluidity index of coal---softening temperature interval (coking coal softens the temperature range being molten to solidification from plastic mass) is segmented 1/3 coking coal, adapted is optimized to 1/3 coking coal that solid softening temperature interval is 70 ~ 85 DEG C, thus reaches the object of stable coke quality.Concrete Coal Blending Schemes of the present invention is:

1) carry out Giseeler fluidity mensuration to 1/3 coking coal, choosing wherein admittedly softening temperature interval is that 1/3 coking coal of 70 ~ 85 DEG C is designated as I class 1/3 coking coal, Gu 1/3 coking coal of softening temperature interval ﹥ 85 DEG C is designated as other 1/3 coking coal;

2) I class 1/3 coking coal is carried out coal blending by following mass percent:

Gas-fat coal: 1 ~ 10%, rich coal: 1 ~ 10%, I class 1/3 coking coal: 1 ~ 15%, other 1/3 coking coal: 10 ~ 20%, coking coal: 40 ~ 45%, lean coal: 10 ~ 15%.

Further, described step 2) in, by mass percent, I class 1/3 coking coal: 11 ~ 15%.

Further, described step 2) in, by mass percent, gas-fat coal: 5 ~ 10%, rich coal: 5 ~ 10%, other 1/3 coking coal: 15 ~ 20%.

The present inventor finds through research, volatilization is divided into the inclined bottle coal of Quality of Part Coal in 34% and 1/3 above coking coal, further research finds, the solid softening temperature interval of this part 1/3 coking coal is not higher than 85 DEG C, further study discovery, in 1/3 coking coal of the inclined bottle coal of this Quality of Part Coal, Gu 1/3 coking coal that softening temperature interval is 70 ~ 85 DEG C differs larger with the 1/3 coking coal character that solid softening temperature interval is less than 70 DEG C, accordingly, the present invention adopts the solid softening temperature interval in Giseeler fluidity index to be optimized segmentation to 1/3 coking coal, and be aided with the Blending adapted, serve the object of stable coke quality.

Embodiment

Below in conjunction with embodiment, the present invention is further detailed explanation.

Coke making and coal blending method of the present invention carries out according to the following steps:

(1) two kind of 1/3 coking coal is got, called after 1/3 coking coal 1#, 1/3 coking coal 2#, carry out G, Y value, volatile matter and Giseeler fluidity index determining respectively, and according to Giseeler fluidity index determining data, the solid softening temperature obtaining two kind of 1/3 coking coal is interval, and each achievement data recorded is beneficial to table 1:

The index of correlation data of table 1 two kind of 1/3 coking coal

Title	G	Y/mm	V _daf/％	Gu softening temperature is interval/DEG C
					1/3 coking coal 1#	80	14	37.19	81
1/3 coking coal 2#	79	14	35.62	63

From 1 table, G conveniently, Y value analytical procedure, this two kind of 1/3 coking coal G, Y value and volatile matter are close, and quality should be identical, can carry out adapted by coal class of the same race, but find that there is obvious difference in the solid softening temperature interval of these two kinds of coals by Giseeler fluidity mensuration.

(2) this two kind of 1/3 coking coal is all carried out coal-blending coking according within the scope of blending ratio described in scheme 1 ~ 6, other coal ore deposit point, identical in quality, concrete Coal Blending Schemes is in table 2:

The Coal Blending Schemes of table 2 two kind of 1/3 coking coal

Scheme	Gas-fat coal/%	Rich coal/%	Subjects/%	Other 1/3 coking coal/%	Coking coal/%	Lean coal/%
							1	5	10	10 (1/3 coking coal 1#)	20	40	15
2	5	10	10 (1/3 coking coal 2#)	20	40	15
							3	5	10	15 (1/3 coking coal 1#)	15	40	15
4	5	10	15 (1/3 coking coal 2#)	15	40	15
							5	5	10	20 (1/3 coking coal 1#)	10	40	15
6	5	10	20 (1/3 coking coal 2#)	10	40	15

(3) heat property test analysis is carried out to the coke of above-mentioned 6 Coal Blending Schemes gained, the results are shown in Table 3.

The Thermal Properties of Coke value of the different Coal Blending Schemes gained of table 3

Scheme	CRI/％	CSR/％
			1	19.57	68.23
2	20.89	67.54
			3	21.52	67.42
4	22.53	62.78
			5	23.78	63.00
6	23.86	61.28

From the Thermal Properties of Coke data of table 3, when subjects proportioning is 10% time, the CSR numerical value difference that two kind of 1/3 coking coal allocates rear coke into is less, all in more excellent level; And when subjects proportioning reaches 15%, 1/3 coking coal 1# and proportioning coke CSR difference 10% time is less, 1/3 coking coal 2# and proportioning coke CSR deterioration amplitude 10% time is obvious; When subjects proportioning reaches 20%, two kind of 1/3 coking coal allocate into rear coke CSR numerical value and dosage 10% time compared with, all there is the larger range of decrease.

Through test detailed further, when solid softening temperature interval is 70 ~ 85 DEG C, volatile matter 34% and 1/3 above Blending of Coking Coals within 11% time, under identical Coal Blending Schemes, it is less than 70 DEG C with solid softening temperature interval, volatile matter 34% and 1/3 above coke quality fluctuation that coking coal refines not obvious, and all quality better (so-called identical Coal Blending Schemes, refer to that other single grade coal coals are identical, corresponding mass percent is identical, different is only have solid softening temperature interval to be 70 ~ 85 DEG C in a kind of Coal Blending Schemes, volatile matter is 34% and 1/3 above coking coal, solid softening temperature interval is had to be less than 70 DEG C in another kind of Coal Blending Schemes, volatile matter 34% and 1/3 above coking coal), 11 ~ 15% time, Gu softening temperature is interval is 70 ~ 85 DEG C, volatile matter 34% and 1/3 above coking coal and solid softening temperature interval be less than 70 DEG C, volatile matter 34% and 1/3 above coking coal institute coking charcoal otherness clearly, when proportioning is more than 15%, two kind of 1/3 coking coal all can deteriorated coke quality.

If carry out coal blending by original coal analysis method, Gu softening temperature interval is 70 ~ 85 DEG C, volatile matter is less than 70 DEG C at 34% and 1/3 above coking coal and solid softening temperature interval, volatile matter divides a class coal at 34% and 1/3 above coking coal and use, but obviously, above-mentioned 1/3 different coking coal is used to carry out coal blending, by the quality of remarkably influenced coke, particularly when proportioning is 11 ~ 15% time, then there will be the poor two kinds of distinct coking effects of the better a kind of coke quality of a kind of coke quality.

Therefore by being distinguished this kind of 1/3 coking coal by solid softening temperature interval described in the inventive method, and require to carry out the Reasonable effect can playing stable coke quality to interval 1/3 coking coal between 70 ~ 85 DEG C of solid softening temperature according to described blending ratio.

Claims

1. solid softening temperature interval is a coke making and coal blending method for less than 85 DEG C 1/3 coking coal, it is characterized in that: the Coal Blending Schemes of the method is:

Gas-fat coal: 1 ~ 10%, rich coal: 1 ~ 10%, I class 1/3 coking coal: 1 ~ 15%, other 1/3 coking coal: 10 ~ 20%, coking coal: 40 ~ 45%, lean coal: 10 ~ 15%;

Described solid softening temperature interval be the volatilization of less than 85 DEG C 1/3 coking coal be divided into 34% and more than.

2. solid softening temperature interval according to claim 1 is the coke making and coal blending method of less than 85 DEG C 1/3 coking coal, it is characterized in that: described step 2) in, by mass percent, I class 1/3 coking coal: 11 ~ 15%.

3. solid softening temperature interval according to claim 1 and 2 is the coke making and coal blending method of less than 85 DEG C 1/3 coking coal, it is characterized in that: described step 2) in, by mass percent, gas-fat coal: 5 ~ 10%, rich coal: 5 ~ 10%, other 1/3 coking coal: 15 ~ 20%.