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US 9,463,980 B2Granted
Method for manufacturing coke
AssigneeJfe Steel Corporation
InventorsKiyoshi Fukada, Hiroyuki Sumi, Izumi Shimoyama, Takashi Anyashiki, Hidekazu Fujimoto, Tetsuya Yamamoto, Yusuke Dohi
Life of this patent
Estimating the term…
Abstract
Coke is manufactured by blending two or more kinds of coal to form a coal blend and by carbonizing the coal blend. Interfacial tension among coal kinds is used as a control index for determining the blending ratio of each coal when forming the coal blend. It is possible to increase the strength of coke without increasing the material cost of a coal blend.
Claims26
A method for manufacturing coke from a blend of two or more types of coals, the method comprising:
- deriving a mathematical relationship between an interfacial tension of a coal blend consisting of two or more kinds of coal and a strength of coke which is manufactured by carbonizing the coal blend, wherein the interfacial tension of the coal blend is determined by measuring the surface tension of the two or more kinds of coal in the blend then using a mathematical relationship between the surface tension of the kinds of coal and the interfacial tension of the coal blend to determine the interfacial tension;
- determining an optimal blending ratio for the two or more kinds of coal using the mathematical relationship between the interfacial tension of the coal blend and the strength of coke which is manufactured by carbonizing the coal blend;
- blending the two or more kinds of coal according to the optimal blending ratio to create an optimal coal blend, wherein the optimal coal blend will be converted to a coke when carbonized;
- and
- carbonizing the optimal coal blend to form the coke,
- wherein the surface tension of the coal is a surface tension obtained by heating the coal at a temperature of 350° C. or higher and 800° C. or lower, by cooling the heated coal under an inert gas atmosphere, and by performing measurement using the cooled coal.
3 more elements
A method for manufacturing coke from a blend of two or more types of coals, the method comprising:
- deriving a mathematical relationship between an interfacial tension of a coal blend consisting of two or more kinds of coal and a strength of coke which is manufactured b carbonizing the coal blend, wherein the interfacial tension of the coal blend is determined by measuring the surface tension of the two or more kinds of coal in the blend then using a mathematical relationship between the surface tension of the kinds of coal and the interfacial tension of the coal blend to determine the interfacial tension;
- determining an optimal blending ratio for the two or more kinds of coal using the mathematical relationship between the interfacial tension of the coal blend and the strength of coke which is manufactured by carbonizing the coal blend;
- blending the two or more kinds of coal according to the optimal blending ratio to create an optimal coal blend, wherein the optimal coal blend will be converted to a coke when carbonized;
- and
- carbonizing the optimal coal blend to form the coke,
- wherein the surface tension of the coal is a surface tension obtained by heating the coal at a temperature of an initial softening temperature or more and a solidification temperature or less, by cooling the heated coal under an inert gas atmosphere, and by performing measurement using the cooled coal.
3 more elements
A method for manufacturing coke in which a coal blend is formed by blending two or more kinds of coal and the coal blend is carbonized, the method comprising:
- determining a blending ratio of each kind of coal so that at least one of interfacial tensions γinter obtained from the equations (1) and (2) below of the coal blend is 0.03 mN/m or less:
- γ
- inter
- =
- W
-
-
- Γ
-
-
- W
- t
- ,
- where
-
-
- Γ
- =
- [
- γ
- 11
- γ
- 12
- …
- γ
- 1
-
- j
- …
- γ
- 1
-
- n
- γ
- 21
- γ
- 22
- ⋮
- ⋮
- ⋱
- ⋮
- γ
- i
-
-
- 1
- γ
- i
-
-
- j
- γ
- i
-
-
- n
- ⋮
- ⋱
- ⋮
- γ
- n
-
-
- 1
- …
- …
- γ
- n
-
-
- j
- …
- γ
- n
-
-
- n
- ]
-
-
- γ
- i
-
-
- j
- =
-
- γ
- i
- +
- γ
- j
- -
- 2
-
- exp
-
- [
- -
- β
-
- (
- γ
- i
- -
- γ
- j
- )
- 2
- ]
-
- γ
- i
-
- γ
- j
- γ
- i
-
-
- j
- =
-
- γ
- j
-
-
- i
- W
- =
-
- (
- w
- 1
-
-
- w
- 2
-
-
- …
-
-
- w
- i
-
-
- …
-
-
- w
- n
- )
- ∑
- i
- =
- 1
- n
-
- w
- i
- =
-
- 1
- (
- 1
- )
- γi:
- the surface tension of coal i
- γij:
- the interfacial tension between coal i and coal j
- wi:
- the blending ratio of coal i
- γinter:
- the interfacial tension of a coal blend consisting of coal 1, coal 2, . . . , coal i, . . . and coal n;
- σ
- γ
- 2
- =
- 100
- 100
-
- ∑
- i
- =
- 1
- n
-
- w
- i
- -
- 1
-
- [
- ∑
- i
- =
- 1
- n
-
- γ
- i
- 2
-
- w
- i
- -
- (
- ∑
- i
- =
- 1
- n
-
- γ
- i
-
- w
- i
- )
- 2
- ∑
- i
- =
- 1
- n
-
- w
- i
- ]
-
- ∑
- i
- =
- 1
- n
-
- w
- i
- =
- 1
- γi:
- the surface tension of coal i
- wi:
- the blending ratio of coal i
- γinter:
- the interfacial tension of a coal blend consisting of coal 1, coal 2, . . . , coal i, . . . and coal n
- σγ2:
- the variance of the surface tensions of all the constituent kinds of coal;
- and
- carbonizing the coal blend to form the coke,
- wherein the surface tension of the coal is a surface tension obtained by heating the coal at a temperature of 350° C. or higher and 800° C. or lower, by cooling the heated coal under an inert gas atmosphere, and by performing measurement using the cooled coal.
249 more elements
Dependencies are inferred from the claim text.