THERMAL SCIENCE

International Scientific Journal

Kostas S. Hatzilyberis

,

George P. Androutspoulos

LIGNITE CHEMICAL CONVERSION IN AN INDIRECT HEAT ROTARY KILN GASIFIER

ABSTRACT
The results on the gasification of Greek lignite using two indirect heat (allothermal) pilot rotary kiln gasifiers are reported in the present work. The development of this new reactor-gasifier concept intended for solid fuels chemical conversion exploits data and experience gained from the following two pilot plants. The first unit A (about 100 kg/h raw lignite) demonstrated the production of a medium heating value gas (12-13 MJ/Nm3) with quite high DAF (dry ash free) coal conversions, in an indirect heat rotary gasifier under mild temperature and pressure conditions. The second unit B is a small pilot size unit (about 10 kg/h raw lignite) comprises an electrically heated rotary kiln, is an operation flexible and exhibits effective phase mixing and enhanced heat transfer characteristics. Greek lignite pyrolysis and gasification data were produced from experiments performed with pilot plant B and the results are compared with those of a theoretical model. The model assumes a scheme of three consecutive-partly parallel processes (i. e. drying, pyrolysis, and gasification) and predicts DAF lignite conversion and gas composition in relatively good agreement with the pertinent experimental data typical of the rotary kiln gasifier performance. Pilot plant B is currently being employed in lime-enhanced gasification studies aiming at the production of hydrogen enriched synthesis gas. Presented herein are two typical gas compositions obtain from lignite gasification runs in the presence or not of lime. .
KEYWORDS
indirect heat (allothermal) rotary kiln gasifier, zero-emission coal technology, pilot plant, gasification modeling, lime enhanced steam gasification, Greek lignite
PAPER SUBMITTED: 2005-07-19
PAPER REVISED: 2006-11-13
PAPER ACCEPTED: 2006-11-16
DOI REFERENCE: https://doi.org/10.2298/TSCI0603181H
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2006, VOLUME 10, ISSUE Issue 3, PAGES [181 - 197]
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Lignite chemical conversion in an indirect heat rotary kiln gasifier

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