Development of a CHP unit based on HCCI engine for using unprocessed syngas from biomass gasifiers

Subir Bhaduri, Francesco Contino, Herve Jeanmart, Ernst Breuer

Onderzoeksoutput: Unpublished paper

Samenvatting

Un-processed syngas from biomass gasification contains impurities such as tars which need to be filtered so as to use the gas as a fuel in spark ignition engines. This filtration setup constitutes a major component of the power plant in terms of size and costs, along with being maintenance prone. Filtration is necessary even for low-tar (of less than 50mg/Nm3) two-stage downdraft gasifier systems due to higher levels of tars in transient conditions. The present study investigates an alternative route to solving the problem of tars with the use of a Homogeneous Charge Compression Ignition (HCCI) engine. This novel idea is based on the fact that a majority of syngas tars begin to condense below 250°C, and thus will not condense if the complete flow path is kept at this temperature. Unlike spark ignition engines that utilize flame-front propagation for combustion, the HCCI combustion is predominantly via autoignition and hence can be designed to work with high temperature gases.
Currently, the experiments are limited to syngas compositions synthesized from bottled gases and used in a 500cc mono-cylinder HCCI engine. The aim of this paper is to discuss syngas combustion in an HCCI engine at intake temperatures of 250°C in the tar condensation region. Experiments exploring the effects of intake temperatures as well as syngas composition, especially the H2:CO ratio are presented.
Originele taal-2English
StatusPublished - 27 mei 2014
Evenement23rd "Journées d'Etude" of the Belgian Section of the Combustion Institute - Brussels, Belgium
Duur: 27 mei 201428 mei 2014

Conference

Conference23rd "Journées d'Etude" of the Belgian Section of the Combustion Institute
LandBelgium
StadBrussels
Periode27/05/1428/05/14

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