气化剂预热温度对加压喷动流化床煤部分气化的影响

EFFECT OF GASIFIYING AGENT PREHEATED TEMPERATUREON PARTIAL GASIFICATION OF COAL IN A PRESSURIZED SPOUT-FLUID BED

在0.1MW加压喷动流化床气化试验装置上成功验证了高温气化介质煤气化新概念,并对气化介质预热温度对煤部分气化特性的影响进行了研究。结果表明,气化介质温度从300℃提高到700℃后,煤气中N2浓度降低导致煤气热值增加幅度达23%,煤气中可燃组分H2和CO浓度分别从10.6%和10.5%上升到15.2%和12.2%,不可燃组分N2和CO2浓度从60.3%和15.3%降低到55.7%和13.5%,而甲烷含量基本不变;相应的冷煤气效率由48.7%增加到59.6%。气化介质预热温度的变化对碳转化率和干煤气产率影响不大。

High temperature air gasification of coal in a 0.1MW thermal input pressurized spout-fluid bed was successfully realized, and the effect of air/steam preheated temperature on coal partial gasification characteristics was investigated in this work. The tests results indicated that the gas heating value was increased by 23% when the gasifying agent preheated temperature increased from 300℃ to 700℃ due to the decrease of the concentration of nitrogen in the gas. The concentration of hydrogen and carbon monoxide in the gas were increased from 10.6% and 10.5% to 15.2% and 12.2% respectively, while the concentration of nitrogen and carbon dioxide were decreased from 60.3% and 15.3% to 55.7% and 13.5% respectively, and the concentration of methane kept constant with an increase of preheated air/steam temperature from 300 ℃ to 700 ℃. Increasing the gasifying agent temperature would increase the gasification efficiency from 48.7% to 59.6%. The carbon conversion and dry gas yield were almost constant regardless of the preheated air/steam temperature.