THERMAL SCIENCE

International Scientific Journal

Xiangyun Chen

,

Yongfeng Zhang

,

Qiancheng Zhang

,

Chunping Li

,

Quan Zhou

THERMAL ANALYSES OF THE LIGNITE COMBUSTION IN OXYGEN-ENRICHED ATMOSPHERE

ABSTRACT
In this work, the oxygen-enriched combustion behavior of indigenous lignite was measured by a thermogravimetric analyzer (TG). Combustion tests were carried out in N2/O2 atmosphere with an oxygen content ranging from 21% to 70 vol%.The data show that the calorific value per unit time (CVT) of the lignite was improved with increased oxygen concentration. In order to reveal the oxygen-enriched combustion process in detail, a new index of characteristic temperature Tc was defined to indicate the fixed carbon behavior during burning, and the combustibility indexes D’, Rw, and S were calculated to determine the combustion performance. The functional relation between CVT and oxygen concentration was determined by non-linear fitting method. The results indicated that the relationship between CVT and oxygen concentration fit the exponential function exactly.
KEYWORDS
thermogravimetric analyzer, lignite, oxygen-enriched, calorific value per unit time
PAPER SUBMITTED: 2014-10-05
PAPER REVISED: 2015-01-19
PAPER ACCEPTED: 2015-01-20
PUBLISHED ONLINE: 2015-01-24
DOI REFERENCE: https://doi.org/10.2298/TSCI141005007C
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2015, VOLUME 19, ISSUE Issue 3, PAGES [801 - 811]
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Thermal analyses of the lignite combustion in oxygen-enriched atmosphere

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