Provisional protocol for the sampling and anlaysis of tar and particulatesin the gas from large-scale biomass gasifiers. Version 1998

This paper presents tar sampling protocols for pressurised and atmospheric large scale gasification processes. Methods for constructing sampling lines either to on-line analysers or into sampling systems are described. The ta r sampling system consists of a heated probe, a particulate filter and a se ries of impinger bottles. Dichloromethane is used as the tar absorbing solv ent. The solvent containing bottles are placed in a cold bath so that gradu al cooling of the sampled gas from about 0 degrees C to the final temperatu re -79 degrees C takes place in them. Recommendations for suitable sampling gas flow rates and gas temperatures are given. Tar characterisation method s based on different garvimetric measurements and GC analysis are described . (C) 1999 Elsevier Science Ltd. All rights reserved.