Ash-free coal production method

Patent metadata

Field	Value
Publication number	US-9334456-B2
Application number	US-201214357642-A
Country	US
Kind code	B2
Filing date	Dec 7, 2012
Priority date	Dec 15, 2011
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

Provided is a method that controls and uniformizes fluidity of ash-free coal. The method includes the steps of obtaining an ash-free coal by removing a solvent from a solution containing a coal component dissolved therein (ash-free coal obtaining step (solvent recovering unit 8 )); and mixing a plurality of coals of different types or components thereof, where the coals are capable of individually giving ash-free coals having different fluidities (mixing step (see reference signs B 1 to B 6 )). The ash-free coal obtaining step (solvent recovering unit 8 ) obtains the ash-free coal by removing the solvent from the solution containing components of the coals which have been mixed.

First claim

The invention claimed is:

1. A method for producing an ash-free coal, the method comprising the steps of:
preparing a slurry by mixing coal with a solvent;
extracting a component of the coal soluble in the solvent to give an extraction product by heating the slurry prepared in the slurry preparation step;
separating a solution containing the solvent-soluble coal component from the extraction product extracted in the extraction step;
obtaining an ash-free coal by removing the solvent from the solution separated in the separation step,
wherein:
the method further comprises the step of:
determining a mixing ratio of the coals or components thereof to be mixed, wherein the mixing ratio determining step determines the mixing ratio based on data relating to different fluidities of ash-free coals individually derived from the coals or components thereof; and
mixing a plurality of coals of different types or components thereof based on the mixing ratio and at a timing before the ash-free coal obtaining step, the coals capable of individually giving ash-free coals having different fluidities from each other; and

the ash-free coal obtaining step obtains the ash-free coal by removing the solvent from a solution containing components of the coals which have been mixed.

2. The ash-free coal production method according to claim 1 , wherein:
the mixing ratio determining step comprises the substeps of:
obtaining ash-free coals individually from the coals; and
measuring fluidities of the ash-free coals respectively obtained from the individual ash-free coal obtaining substep; and

the mixing ratio determining step determines the mixing ratio based on the fluidities determined in the fluidity measuring substep.

3. The ash-free coal production method according to claim 1 , wherein:
the mixing ratio determining step comprises the substep of measuring average molecular weights of the coals respectively; and
the mixing ratio determining step determines the mixing ratio based on the average molecular weights measured in the molecular weight measuring substep.

4. The ash-free coal production method according to claim 3 , wherein the coals have a difference in average molecular weight of 30 or more.

5. The ash-free coal production method according to claim 1 , wherein the ash-free coals obtained individually from the coals have a difference in maximum fluidity of 1.0 (Log(ddpm)) or more.

Assignees

• Kobe Steel Ltd
• Kobe Steel Ltd

Inventors

• Sakai Koji
• Shishido Takahiro
• Okuyama Noriyuki
• Hamaguchi Maki

Classifications

• C10L1/322 Primary

  Coal-oil suspensions · CPC title

• C10L5/04 Primary

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