PROJECTED EMISSIONS OF HAZARDOUS AIR-POLLUTANTS FROM A SHELL COAL-GASIFICATION PROCESS COMBINED-CYCLE POWER-PLANT

An integral part of the development programme for the Shell coal gasif ication process (SCGP) has been the determination of hazardous air pol lutants (HAPs) and other trace constituents in the process syngas. Num erous results at the Shell Coal Gasification Plant-1 (SCGP-1) verify t hat very few HAPs or any other trace constituents are present in the s yngas, and the concentrations of those few species present are extreme ly low. These results from direct measurements on the syngas are subst antiated by analyses of other process streams and by inspection of syn gas clean-up equipment and transport lines during decommissioning. The results are used to project emissions of HAPs and other trace constit uents for a 500 MW SCGP-combined-cycle power plant. Not only would suc h a facility not be defined as a major source of HAPs, but in fact it might even establish a benchmark (based on low HAP emissions) for new coal-based power generation.