Combustion behaviour of ultra clean coal obtained by chemical demineralisation

Rubiera, F, Arenillas, A, Arias, B, Pis, JJ, Suarez-Ruiz, I, Steel, KM and Patrick, JW (2003) Combustion behaviour of ultra clean coal obtained by chemical demineralisation. Fuel, 82 15-17: 2145-2151. doi:10.1016/S0016-2361(03)00181-9


Author Rubiera, F
Arenillas, A
Arias, B
Pis, JJ
Suarez-Ruiz, I
Steel, KM
Patrick, JW
Title Combustion behaviour of ultra clean coal obtained by chemical demineralisation
Journal name Fuel   Check publisher's open access policy
ISSN 0016-2361
Publication date 2003-10-01
Sub-type Article (original research)
DOI 10.1016/S0016-2361(03)00181-9
Open Access Status
Volume 82
Issue 15-17
Start page 2145
End page 2151
Total pages 7
Publisher ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Language eng
Abstract The increasing environmental concern caused by the use of fossil fuels and the concomitant need for improved combustion efficiency is leading to the development of new coal cleaning and utilisation processes. However, the benefits achieved by the removal of most mineral matter from coal either by physical or chemical methods can be annulled if poor coal combustibility characteristics are attained. In this work a high volatile bituminous coal with 6% ash content was subjected to chemical demineralisation via hydrofluoric and nitric acid leaching, the ash content of the clean coal was reduced to 0.3%. The original and treated coals were devolatilised in a drop tube furnace and the structure and morphology of the resultant chars was analysed by optical and scanning electron microscopies. The reactivity characteristics of the chars were studied by isothermal combustion tests in air at different temperatures in a thermogravimetric system. Comparison of the combustion behaviour and pollutant emissions of both coals was conducted in a drop tube furnace operating at 1000 degrees C. The results of this work indicate that the char obtained from the chemically treated coal presents very different structure, morphology and reactivity behaviour than the char from the original coal. The changes induced by the chemical treatment increased the combustion efficiency determined in the drop tube furnace, in fact higher burnout levels were obtained for the demineralised coal.
Keyword Coal demineralisation
Nitric acid
Hydrofluoric acid
Char Reactivity
Drop tube furnace
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Faculty of Engineering, Architecture and Information Technology Publications
 
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Created: Sat, 11 Jul 2009, 01:31:12 EST by Dr Karen Steel on behalf of School of Chemical Engineering