携带流反应器中稻壳气化过程的火用分析

引言生物质能作为一种可再生的清洁能源,可以减少CO2、NOx、SOx及颗粒物的排放1],其开发利用受到世界各国的极大关注2]。生物质气化被认为是生物质利用的最有前途的能源转化方式之一3],已经成为能源研发与利用的一大研究热点。研究结果表明,气化器或者锅炉是能源转化和利用过程中效率最低的一个操作单元4],因此,气化器效率的提高能在很大程度上改善整个能源转化过程5]。在忽略热量损失时,一个绝热良好的气化器的

Exergy analysis of rice husk gasification process in entrained-flow reactor

Effect of air equivalence ratio ER on rice husk gasification in an entrained-flow reactor at different temperatures is analyzed using exergy concept.The results show that the contribution of gas component to exergy value is as follows:CO>H2>CH4>(N2,C2H4,CO2).With ER goes up the exergy value and its efficiency increase first and then decrease for product gas,however,the residual ratio and exergy efficiency decline first and then augment for unreacted carbon.At ER 0.25 and reactor temperature 1000℃,total exergy value and exergy efficiency of product gas are 7983.95 kJ·kg-1 and 54.35%,respectively,and at ER 0.28 and temperature 1000℃,the residual ratio and exergy efficiency of unreacted carbon are 24.82% and 21.49%,respectively.Raising temperature can lift exergy value and exergy efficiency of product gas,but reduce residual ratio and exergy efficiency of unreacted carbon.