Abstract
Experimental studies to characterize the influence of water influx on steam-oxygen gasification of lignite have been performed using a fixed-bed reactor. Water was directly injected from the upstream side of combustion front and the time span of water injection ranged between 30 minutes and 270 minutes. The variations of product gas composition, heating value, and gas production rate following water and steam injections are presented. The experimental results generally show that compared to steam injection, water injection has a markedly different influence on the system outputs. The transient behavior of the product gas composition following water influx was much slower than for a steam feed rate change and was characterized by symmetrical variation in H2 and CO2 mole fractions. A similar trend was observed between the variations of the total gas production rate and the product gas heating value. The response of the gasification system to water influx can be categorized by three distinct types of transie...
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