ABSTRACT
The availability of hot gas clean up systems which can meet environmental regulations and protect other system components is essential for the introduction of advanced coal conversion processes. Granular bed filtration is considered as a promising technique. This report describes the progress in the project during the first 2 years. During the operation of the sub pilot-scale pressurised fluidised bed combustor a number of experimental problems were experienced. The coal feed system, the construction of the bottom part of the first cyclone and the operating procedure were modified. The influence of operating parameters on the elutriation of solids from the combustor and the operation of the two high temperature cyclones has been determined. Laboratory-scale test rigs which are used for the development of on-line, in-situ particulate measurement systems, recycle cyclones and electrostatic enhancement of granular bed filtration have been designed and built. Measuring instruments for the determination of electrostatic-, flow-and sintering properties of ash and filter materials at high temperatures and the in-situ charge of particulates in the exhaust of a PFB combustor are under development and some preliminary results have been obtained.
