Inception criteria for entrainment of molten slag droplet in an entrained flow coal gasifier

Experimental studies using 2 t/d and 200 t/d coal gasifier were carried out to investigate the inception criteria for entrainment of molten slag droplet in an entrained flow coal gasifier. It was clarified that average gas dynamic pressure Pd and liquid film Reynolds number Ref influenced strongly the phenomenon of entrainment of molten slag. The formula of the critical gas dynamic pressure Pdc and the critical Weber number Wec=1.73, which could be applied to the large-scale gasifier, were obtained as inception criteria for the phenomenon. It was clearly shown that the flow pattern in the large-scale gasifier could be different from the smaller gasifier by means of numerical simulation analysis and that the critical velocity Ugc decreases relatively along with the scaling - up of the gasifier.