✍ Scribed by Jong Min Lee; Yong Jeon Kim; Sang Done Kim
No coin nor oath required. For personal study only.
Australian subbituminous coal loaded with the single and mixed catalysts of the alkali and transition metal salts [K 2 CO 3 , Ni(NO 3 ) 2 , K 2 SO 4 , Ni(NO 3 ) 2 +K 2 SO 4 ] was gasi®ed in an internally circulating ¯uidized bed (0.3 m-I.D. Â 2.7 m-high) with a draft tube (0.1 m-ID Â 0.9 m-high) at atmospheric pressure. Air and steam as the reactant gases were introduced into the draft tube and annulus regions in the bed separately. The eects of reaction temperature (750±9008C), O 2 /coal ratio (0.3±0.5) and steam/ coal ratio (0.3±0.8) on compositions, gas yield, calori®c value of the product gas, and carbon conversion in the catalytic and non-catalytic coal gasi®cations have been determined. Coal gasi®cation in the newly developed internally circulating ¯uidized bed with a draft tube produces higher calori®c value gas (12 MJ/m 3 ) with higher catalytic reaction rate and selectivity compared with the other types of gasi®ers.
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