流化床生物质与煤共气化特性的初步研究

在热天平和流化床实验装置中研究了生物质与煤的共气化特性，采用程序升温热重法对稻秆焦、高粱秆焦、玉米秆焦和神木煤焦以及生物质焦与煤焦混合物进行水蒸气气化研究。结果表明，生物质焦和煤焦的反应活性依次增大，其顺序为高粱焦>稻秆焦>玉米焦>神木煤焦。一定温度下，生物质焦与煤焦混合物的气化碳转化率高于各自气化碳转化率的加和。在流化床气化实验中，比较了单独煤气化与稻秆/煤混合物气化的结果，实验结果表明，混合物气化碳转化率、气体中可燃组分的体积分数均高于单独煤气化，气体中CO2的体积分数低于单独煤气化CO2的体积分数。

Experimental study on co-gasification of biomass and coal

The gasification of the mixture of biomass and coal in a thermogravimetric apparatus(TGA) and a fluidized-bed was investigated.TGA was used to characterize the H_2O-char gasification of rice haulm char,broomcorn haulm char,cornstalk haulm char and Shenmu coal char.The results show that the order of reactivity of various chars is as follows: Shenmu coal char < cornstalk haulm char < rice haulm char < broomcorn haulm char.The co-gasification rate of the mixture of biomass char and coal char is found to be higher than the rate sum of single coal char and single biomass char,which suggests that a synergistic effect takes place due to the co-gasification.In fluidized-bed gasification experiments,the carbon conversion and the content of burnable gas of co-gasification are higher than that of coal gasification alone,while the content of CO_2 is lower.H_2 and CO_2 contents varying with the ratio of feeding oxygen to feeding carbon show different tendency between co-gasification and coal gasification.It implies that the co-gasification is affected by not only the reaction rate but also the gas-solid hydrodynamics in fluidized bed gasifier.