Coal-gasification kinetics derived from pyrolysis in a fluidized-bed reactor
1998; Elsevier BV; Volume: 23; Issue: 6 Linguagem: Inglês
10.1016/s0360-5442(98)00011-5
ISSN1873-6785
AutoresJeong Yong Lee, Young‐Hoon Kim, W. Robert Lee, Sang Soo Kim,
Tópico(s)Granular flow and fluidized beds
ResumoCoal pyrolysis and gasification reactions were carried out in a fluidized-bed reactor (0.1 m i.d. by 1.6 m height) over a temperature range from 1023 to 1173 K at atmospheric pressure. The overall gasification kinetics for the steam–char and oxygen–char reactions were determined in a thermobalance reactor. The compositions of the product gases from the coal-gasification reactions are 30–40% H2, 23–28% CO, 27–35% CO2 and 6–9% CH4 with heating values of 2000–3750 kJ m−3. The heating value increases with increasing temperature and steam/coal ratio but decreases with increasing air/coal ratio. Our kinetic data derived from the two-phase theory on coal gasification in a thermobalance reactor and coal pyrolysis in a fluidized bed may be used to predict the product-gas compositions.
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