关键词: 煤气化, 飞灰形成, 矿物转化

Abstract: Ash formation during coal gasification was investigated based on benchscale OMB gasifier Particle size and composition of the initial minerals and the resulting fly ash were measured by SEM, XRF, XRD and Malvern Laser Particle Size AnalyzerThe results showed that particle size distribution and composition of fly ash were significantly different between fly ash at impinging zone and fly ash at gasifier outletParticle size distribution of fly ash at impinging zone was slightly finer than that of raw coal, composition of fly ash at impinging zone was quartz, calcite and FeSParticle size distribution of fly ash at gasifier outlet dramatically decreased compared to that of fly ash at impinging zone, and composition of fly ash at gasifier outlet was quartz, calcite, FeS, mullite, anorthite, gehlenite and calcium oxideAsh formation mechanisms at different gasification stages were also differentPart of fixed carbon combustion and excluded mineral transformation were the mechanisms of ash formation at the combustion stage, char fragmentation and included mineral liberation and transformation were the mechanisms of ash formation at the char gasification stage.

Key words: coal gasification, ash formation mechanism, mineral transformation