CN102095667B

CN102095667B - Coal quality assessment method of coking coal having volatile component between 27% and 29%

Info

Publication number: CN102095667B
Application number: CN2010105999837A
Authority: CN
Inventors: 项茹; 薛改凤; 鲍俊芳; 宋子逵; 张雪红; 陈鹏; 张前香; 詹立志; 查海鑫
Original assignee: Wuhan Iron and Steel Group Corp
Current assignee: Wuhan Iron and Steel Co Ltd
Priority date: 2010-12-22
Filing date: 2010-12-22
Publication date: 2012-06-06
Anticipated expiration: 2030-12-22
Also published as: CN102095667A

Abstract

The invention discloses a coal quality assessment method of coking coal having a volatile component between 27% and 29%, wherein the Y value is no more than 25mm. The method comprises the following steps of: detecting vitrinoid group average maximum reflectivity caking index G value, Gieseler fluidity parameter and microstructure characteristics after coking; and judging the result. If the vitrinoid group average maximum reflectivity caking index G value of the coking coal is larger than or equal to 85, the temperature is began to be softened to be greater than 400 DEG C, the maximum fluidity temperature is between 450 DEG C and 470 DEG C, and the maximum value of Gieseler fluidity is smaller than or equal to 1500 ddpm; the microstructure characteristic after single coal is coked is mainly in a rough grain mosaic structure, and more than 60% of rough grains are in mosaic structures; therefore, the single coal is assessed to be coking coal; if any index does not accord with the above indexes, the single coal is assessed to be 1/3 coking coal.

Description

The ature of coal sorting technique of a kind of volatile matter coking coal between 27-29%

Technical field

The invention belongs to the coke making and coal blending technical field, be specifically related to the ature of coal sorting technique of a kind of dry ash-free basis volatile matter between the 27-29% coking coal.

Background technology

China's coal resource is abundant, but coking coal resource is in short supply, and skewness weighs in limited coking coal resource.In the coal reserves of having verified, bottle coal and 1/3 coking coal account for more than 46% of coking coal total amount, and coking coal 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%, that is to say that the requirement of various coking coal resource amounts of China and coke making and coal blending does not match.Therefore, in China, rational Application coal blending technology is not only the needs that guarantee coke quality, still rationally utilizes coal resources, practices thrift the actual requirement of cost.And a basic premise of rational Application coal blending technology is wanted exactly and can reasonably be classified to single coal ature of coal of planting.

At present, China adopts the dry ash-free basis volatile matter (V that characterizes the degree of coal metamorphism index _Daf) and characterize the main classification indicators of the caking index (G) of cohesiveness index as coking coal, adopt maximum thickness of plastic layer (Y) and inferior degree of expansion difficult to understand (b) as the subsidiary classification index.But because the coking coal ature of coal is influenced by not only geochron; Also receive the influence of factors such as its geographical environment, the condition of coal formation; The coal of same category, with the difference in area, ore deposit point even coal seam, its ature of coal also has bigger difference; In coal-blending coking, some coal possibly not have or can not play well the effect of such coal.Particularly be positioned at single coal of planting of coking coal and 1/3 coking coal classification intersection for the dry ash-free basis volatile matter; Be divided into coking coal or 1/3 coking coal; Not only economic worth has than big-difference, and because coking coal and the effect difference of 1/3 coking coal in process of coking are bigger, what hold water classifies to it; For coal blending rationally, the effect of bringing into play the ature of coal resource to greatest extent also has material impact.

Summary of the invention

Technical matters to be solved by this invention provides a kind of ature of coal sorting technique of coking coal; With reasonable classification dry ash-free basis volatile matter between 27-29%; The Y value is not more than the coking coal of 25mm, overcomes existing method is difficult for reasonable classification, adapted to the single kind coal ature of coal that is positioned at coking coal and 1/3 coking coal classification intersection defective.

For solving the problems of the technologies described above; The technical scheme that the present invention adopts is following: be not more than the coking coal of 25mm for the dry ash-free basis volatile matter between 27-29%, Y value, measure it respectively: the average maximum reflectivity of vitrinite caking index G value; The Giseeler fluidity parameter; Micro-structural feature behind the coking;

If described coal vitrinite average maximum reflectivity

caking index G value>=85; The beginning softening temperature greater than 400 ℃, temperature of maximum fluidity between 450-470 ℃, Giseeler fluidity maximal value≤1500ddpm; Single plant that its micro-structural feature is main with the coarse grain mosaic texture behind the coal coking, and coarse grain is inlayed and is reached more than 60%; Then be categorized as coking coal;

If have any index and These parameters not to meet, then be categorized as 1/3 coking coal.

The present invention is Chinese Coal Classification standard leading indicator dry ash-free basis volatile matter (V _Daf), caking index (G), maximum thickness of plastic layer (Y) and the average maximum reflectivity of vitrinite Index such as micro-structural feature, Giseeler fluidity parameter combines the classification ature of coal behind the coking; Overcome the defective of existing sorting technique; To the dry ash-free basis volatile matter between 27-29%, the Y value coking coal that is not more than 25mm can rationally distinguish, reach to optimize adapted, bring into play the effect of its effect to greatest extent.

Embodiment

The present invention is to China's shanxi coal, tafelberg, Henan coal, and Mongolian coal and Indonesia's coal carried out coal analysis, and classifies by the ature of coal characteristic.

Embodiment 1

Shanxi coal, dry ash-free basis volatile matter (V _Daf) be 27.96%, maximum thickness of plastic layer (Y) is 22mm, through mensuration, its:

The average maximum reflectivity of vitrinite

is 1.05%; Caking index G value 93; Giseeler fluidity is measured: the beginning softening temperature is 405 ℃, and temperature of maximum fluidity is 455 ℃, and the Giseeler fluidity maximal value is 1218ddpm; Its microstructure coarse grain is inlayed and is reached 65% behind single kind coal coking.

Because this average maximum reflectivity of shanxi coal vitrinite is

caking index G value>=85; Giseeler fluidity is measured: the beginning softening temperature is greater than 400 ℃, temperature of maximum fluidity between 450-470 ℃, Giseeler fluidity maximal value≤1500ddpm; Single plant that its micro-structural feature is main with the coarse grain mosaic texture behind the coal coking, and coarse grain is inlayed and is reached more than 60%; Therefore be categorized as coking coal.

Embodiment 2

Indonesia's coal, dry ash-free basis volatile matter (V _Daf) be 27.96%, maximum thickness of plastic layer (Y) is 21mm, through mensuration, its:

The average maximum reflectivity of vitrinite

is 1.13%; Caking index G value is 95; Giseeler fluidity is measured: 410 ℃ of beginning softening temperatures, and temperature of maximum fluidity is 460 ℃, the Giseeler fluidity maximal value is 292ddpm; Its microstructure coarse grain is inlayed and is reached 70% behind single kind coal coking.

Because this average maximum reflectivity of Indonesia coal vitrinite is

Embodiment 3

Mongolia's coal, dry ash-free basis volatile matter (V _Daf) be 27.30%, maximum thickness of plastic layer (Y) is 18mm, through mensuration, its:

The average maximum reflectivity of vitrinite

is 1.10%; Caking index G value is 94; Giseeler fluidity is measured: the beginning softening temperature is 400 ℃, and temperature of maximum fluidity is 444 ℃, and the Giseeler fluidity maximal value is 1062ddpm; Its microstructure coarse grain is inlayed and is reached 35% behind single kind coal coking.

Because it is 400 ℃ that this Mongolia's coal begins softening temperature, temperature of maximum fluidity is not between 450-470 ℃; Its microstructure coarse grain is inlayed and is lower than 60% behind single kind coal coking; Therefore be categorized as 1/3 coking coal.

Embodiment 4

Mongolia's coal, dry ash-free basis volatile matter (V _Daf) be 27.06%, maximum thickness of plastic layer (Y) is 15mm, through mensuration, its:

The average maximum reflectivity of vitrinite

is 1.13%; Caking index G value is 79; Giseeler fluidity is measured: the beginning softening temperature is 418 ℃, and temperature of maximum fluidity is 454 ℃, and the Giseeler fluidity maximal value is 150ddpm; Its microstructure coarse grain is inlayed and is reached 30% behind single kind coal coking.

Because this Mongolia coal caking index G value is less than 85; Its microstructure coarse grain is inlayed and is lower than 60% behind single kind coal coking; Therefore be categorized as 1/3 coking coal.

Embodiment 5

Tafelberg, Henan coal, dry ash-free basis volatile matter (V _Daf) be 28.54%, maximum thickness of plastic layer (Y) is 18mm, through mensuration, its:

The average maximum reflectivity of vitrinite

is 1.01%; Caking index G value is 92; Giseeler fluidity is measured: the beginning softening temperature is 389 ℃, and temperature of maximum fluidity is 440 ℃, and the Giseeler fluidity maximal value is 2148ddpm; Its microstructure coarse grain is inlayed and is reached 45% behind single kind coal coking.

Because this tafelberg, Henan coal begins softening temperature less than 400 ℃, temperature of maximum fluidity is less than 450 ℃, and the Giseeler fluidity maximal value is greater than 1500ddpm; Therefore be categorized as 1/3 coking coal.

Divide according to above sorting technique, use as coking coal, 1/3 coking coal respectively, gained coke quality: shatter strength M40 is greater than 80%, and scuff resistance M10 is less than 7.0%, and reactive (CRI) less than 30%, post-reaction strength (CSR) is greater than 62%.

Claims

1. the ature of coal sorting technique of volatile matter coking coal between 27-29%, the Y value of this coking coal is not more than 25mm, it is characterized in that comprising the steps:

The first step; Measure its vitrinite reflectance and distribute, obtain the average maximum reflectivity of its vitrinite

;

In second step, measure its caking index G value;

In the 3rd step, measure its Giseeler fluidity parameter;

In the 4th step, observe micro-structural feature behind its coking;

In the 5th step, classify according to preceding four step results:

If the average maximum reflectivity of described vitrinite

; Caking index G value>=85; The beginning softening temperature greater than 400 ℃, temperature of maximum fluidity between 450-470 ℃, Giseeler fluidity maximal value≤1500ddpm; Single plant that its micro-structural feature is main with the coarse grain mosaic texture behind the coal coking, and coarse grain inlays and reach more than 60%, then be categorized as coking coal;