Jfe Steel Corporation

Daisuke Igawa

Yusuke Dohi

Takashi Matsui

Tetsuya Yamamoto

Yuji Iwami

Yuya Morita

Issui Akishika

Takahide Higuchi

Kenta Takehara

Kenya Horita

Shohei Fujiwara

Toshiyuki Hirosawa

A method of producing a coal blend by blending plural brands of coal to produce a coal blend includes letting a surface tension of coal when inert material is assumed to be 100 vol % be γ, and letting a surface tension of coal when reactive material is assumed to be 100 vol % be γ, determining γof coal; among brands of coal 1, 2, . . . i, . . . , and n to be blended in a coal blend, specifying coal i in which γis outside of γ; measuring TI of coal i; and determining a blending ratio of coal i such that w calculated by formula (1) is 20.4 mass % or less=Σ()  (1).

Method of producing coal blend and method of producing coke

A method of estimating a surface tension of coal inert material includes determining in advance a first relational expression representing a relationship between a surface tension of coal inert material and a physical property value representing a coal rank; and measuring the physical property value representing the coal rank of a coal for which the surface tension of coal inert material is to be estimated, and calculating the surface tension of the coal inert material by using the measured physical property value representing the coal rank and the first relational expression.

Method of estimating surface tension of coal inert material, method of estimating surface tension of coal, and method of producing coke

Methods for evaluating whether there is a probability that coal will reduce the strength of coke using an apparatus including a stirrer. A degree of entanglement (a−b)/a represented by the heights a and b, or the height a only, is used as an evaluation index for coal, where a height of the semicoke on an inner wall of the container is represented by b, and a height of the semicoke on the stirrer is represented by a. Semicoke formed from heated coal is formed in the container using the degree of entanglement as an evaluation index.

Method for evaluating coal, method for preparing coal blend, and method for producing coke

A method of estimating a surface tension of coal includes subjecting a surface tension, a physical property value representing a coal rank, and a total inert content of each of different brands of coal to multiple regression analysis to determine in advance a regression equation including the surface tension of coal as an objective variable and the physical property value and the total inert content as explanatory variables; and measuring the physical property value and the total inert content of a coal of which the surface tension is to be estimated, and calculating the surface tension of the coal with the measured physical property value and the measured total inert content, and the regression equation.

Method of estimating surface tension of coal and method of producing coke

Growing community of inventors

Tokyo, Japan

Daisuke Igawa