Abstract
In this study 2D numerical simulation for two-stage entrained flow dry feed coal gasification performance was developed. The detailed operational characteristics of O/C distribution between the two stages of the gasifier were examined in standard CFD software FLUENT®14 to analyze their effects on the gasification performance. Furthermore the different reaction mechanisms were investigated for validation of the model with experimental results. The results show that H2 and CO composition at the exit of gasifier are increased at O/C ratio 0.8 as compared to other simulation cases, and the temperature gradually decreases from 2nd injection level because of water-shift reaction. Maximum CO% was observed when 40% of oxygen injected at the lower level, overall range of H2% at the exit of gasifier was 10–45% but maximum H2% was found when 50% O2% and 30% of coal injected at a lower level. The maximum temperature about 2300K when 40% O2 and 40% of coal was injected at a lower level. Overall optimized results for CO, H2, and minimum CO2 formation was observed when 60% O2 and 40% of coal was injected at a lower level of the gasifier. The gasification performance can be controlled with the optimized coal/oxidant distribution between the stages.
Published Version
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