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

Patent metadata

Field	Value
Publication number	US-12110457-B2
Application number	US-202017770573-A
Country	US
Kind code	B2
Filing date	Oct 14, 2020
Priority date	Oct 28, 2019
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

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.

First claim

The invention claimed is:

1. A method of estimating a surface tension of coal inert material comprising:
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;
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, and
determining a blending ratio of different coals based on the calculated surface tension to form a coal blend;
wherein the first relational expression is represented by formula (2);
γ 100 =−14.791 Ro+ 59.324  (2)

wherein, γ is the surface tension, γ 100 is the surface tension of inert material at 100% inert material and Ro is the physical property value representing coal rank and is a mean maximum vitrinite reflectance in JIS M 8816;
wherein the resulting strength of the coke made from the coal blend containing a mixture of coals with a similar γ is higher than that of a coke made from a coal blend containing a mixture of coals with different γ.

2. The method according to claim 1 , wherein the surface tension is a surface tension of coal inert material of a semicoke made by heating coal to a temperature of 350° C. or higher and 800° C. or lower.

3. A method of estimating a surface tension of coal comprising:
calculating a second relational expression representing a relationship between a surface tension and a total inert content of coal from a predetermined surface tension of reactives and a surface tension of inert material estimated by the method according to claim 1 ; and
measuring the total inert content of a coal of which the surface tension is to be estimated, and calculating the surface tension of the coal by using the measured total inert content and the second relational expression,
wherein the second relational expression is represented by formula (3):
γ=[(γ 100 −γ 0 )/100]×TI+γ 0   (3)

wherein, γ is the surface tension,
γ 100 is the surface tension of inert material at 100% inert material,
γ 0 is the surface tension of inert material at 100% reactives, and
TI is the total inert content defined in JIS M 8816 and indicates the proportion (vol %) of inert material contained in coal.

4. The method according to claim 3 , wherein the predetermined surface tension of reactives is an arithmetic mean of surface tensions of reactives in different brands of coal.

5. A method of producing coke comprising: blending coals having surface tensions estimated by
calculating a second relational expression representing a relationship between a surface tension and a total inert content of coal from a predetermined surface tension of reactives and a surface tension of inert material estimated by the method according to claim 1 ; and
measuring the total inert content of a coal of which the surface tension is to be estimated, and calculating the surface tension of the coal by using the measured total inert content and the second relational expression,
wherein the second relational expression is represented by formula (3):
γ=[(γ 100 −γ 0 )/100]×TI+γ 0   (3)

wherein, γ is the surface tension,
γ 100 is the surface tension of inert material at 100% inert material,
γ 0 is the surface tension of inert material at 100% reactives, and
TI is the total inert content defined in JIS M 8816 and indicates the proportion (vol %) of inert material contained in coal
to form a coal blend; and
carbonizing the coal blend to produce coke.

6. A method of estimating a surface tension of coal comprising:
calculating a second relational expression representing a relationship between a surface tension and a total inert content of coal from a predetermined surface tension of reactives and a surface tension of inert material estimated by the method according to claim 2 ; and
measuring the total inert content of a coal of which the surface tension is to be estimated, and calculating the surface tension of the coal by using the measured total inert content and the second relational expression,
wherein the second relational expression is represented by formula (3):
γ=[(γ 100 −γ 0 )/100]×TI+γ 0   (3)

wherein, γ is the surface tension,
γ 100 is the surface tension of inert material at 100% inert material,
γ 0 is the surface tension of inert material at 100% reactives, and
TI is the total inert content defined in JIS M 8816 and indicates the proportion (vol %) of inert material contained in coal.

7. A method of producing coke comprising: blending coals having surface tensions estimated by
calculating a second relational expression representing a relationship between a surface tension and a total inert content of coal from a predetermined surface tension of reactives and a surface tension of inert material estimated by the method according to claim 1 ; and
measuring the total inert content of a coal of which the surface tension is to be estimated, and calculating the surface tension of the coal by using the measured total inert content and the second relational expression,
wherein the second relational expression is represented by formula (3):
γ=[(γ 100 −γ 0 )/100]×TI+γ 0   (3)

wherein, γ is the surface tension,
γ 100 is the surface tension of inert material at 100% inert material,
γ 0 is the surface tension of inert material at 100% reactives, and
TI is the total inert content defined in JIS M 8816 and indicates the proportion (vol %) of inert material contained in coal;
wherein the predetermined surface tension of reactives is an arithmetic mean of surface tensions of reactives in different brands of coal
to form a coal blend; and carbonizing the coal blend to produce coke;
wherein the resulting strength of the coke made from the coal blend containing a mixture of coals with a similar γ is higher than that of a coke made from a coal blend containing a mixture of coals with different γ.

8. A method of producing coke comprising: blending coals having surface tensions estimated by
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;
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, and
determining a blending ratio of different coals based on the calculated surface tension to form a coal blend;
wherein the first relational expression is represented by formula (2);
γ 100 =−14.791 Ro +59.324  (2)

wherein, γ is the surface tension, γ 100 is the surface tension of inert material at 100% inert material and Ro is the physical property value representing coal rank and is a mean maximum vitrinite reflectance in JIS M 8816
to form a coal blend; and
carbonizing the coal blend to produce coke;
wherein the resulting strength of the coke made from the coal blend containing a mixture of coals with a similar γ is higher than that of a coke made from a coal blend containing a mixture of coals with different γ.

Assignees

• Jfe Steel Corp

Inventors

• Igawa Daisuke
• Dohi Yusuke
• Yamamoto Tetsuya

Classifications

• G01N33/222

  Solid fuels, e.g. coal · CPC title

• G01N13/00 Primary

  Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects (scanning-probe techniques or apparatus G01Q) · CPC title

• C10L5/04

  Raw material {of mineral origin} to be used; Pretreatment thereof {(pretreatment of fuels of non-mineral origin C10L5/40)} · CPC title

• C10B57/04 Primary

  using charges of special composition · CPC title

• G01N33/22

  Fuels; Explosives · CPC title