Innovative coal gasification system with high temperature air

This paper proposes innovative coal gasification power generation systems where coal is gasified with high temperature air of about 1300 K produced by gasified coal fuel gas. The main features of these systems are high thermal efficiency, low NO_x emission, compact desulfurization and dust removal equipment and high efficiency molten slag removal with a very compact gasifier. Experimental results on the pebble bed coal gasifier appropriate for high temperature air coal gasification are reported, where 97.7% of coal ash is successfully caught in the pebble bed and extracted without clogging. A new concept of high temperature air preheating system is proposed which is characterized by its high reliability and low cost