Global Geology 2013, 16(3) 144-148 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Keywords
underground coal gasification
monitoring
thermo-magnetic conversion
laboratory experiment
coal samples
Authors
Tatiana Selivanova and Vladimir Pechnikov
PubMed
Article by Tatiana SAVP

Thermo-chemical conversion of coal samples under high temperature

Tatiana Selivanova and Vladimir Pechnikov

Engineering School,Far Eastern Federal University,Vladivostok 690690,Russia

Abstract

Exhaustion of profitable coal resources makes for need of innovation including underground coal gasification ( UCG) . One of the most important problems of UCG is evaluation of the combustion area in underground coal seams. Physicochemical parameters of coal,in a whole,and coal mineral substance are changed under heating and combusting. Thermo-chemical conversion of coal mineral components has an effect on magnetic characteristics of coal seam and can be used for real-time control of combusting area. To this guessing check laboratory experiments have been made as an activity of the Far Eastern Federal University. Our investigation based on a theoretical analysis and laboratory simulation tests. Typical results of the laboratory experiments are presented below. Under heating coal thermo-chemical magnetization is forming. Coal's magnetic parameters varieties from anti-ferromagnetiс to ferromagnetic. Anti-ferromagnetic pyrite and siderite presented into coal mass is transformed into magnetic hematite and magnetite under heating. Therefore,geomagnetic is expected to be a useful geophysical tool to for evaluation of combustion volume and its migration for underground coal gasification.

Keywords underground coal gasification   monitoring   thermo-magnetic conversion   laboratory experiment   coal samples  
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