生物质流化床富氧气化的实验研究

在常压流化床装置上进行了生物质在富氧条件下定向气化的实验研究。实验主要考察了氧的当量比和氧体积分数对气化气组成、碳转化率和气体热值的影响。当量比值是与温度紧密联系的一个量，本实验主要通过调节进料量来改变它的值，随着当量比的变化（0.21～0.29），燃气成分也会改变，其中变化最大的是H2、CO。H2体积分数显著增加，CO和CH4体积分数有降低的趋势，使燃气热值降低；氧体积分数是富氧气化过程中较重要的参数，在实验研究的范围内，发现增大氧气体积分数可以提高H2体积分数及有利于调节H2/CO(体积分数)的比值。当氧气体积分数从21％提高到45％，H2体积分数从20％增加到27.7％，H2/CO(体积分数)从0.38增加到0.75，比较接近合成液体燃料的气体比值。

Biomass gasification under O2-rich gas in a fluidized bed reactor

Biomass gasification under O_2-rich gas was carried out in a fluidized bed reactor. The effects of equivalence ratio and volume fraction of oxygen on gas composition, carbon conversion and low heating value (LHV) of fuel gas were investigated through a series of experiments. Equivalence ratio (ER) is closely related to the bed temperature changed by adjusting the feeding rate. When ER varied from 0.21 to 0.29, the gas compositions were changed. The volume fraction of hydrogen increases apparently when the volume fraction of reducing species, such as CO and CH_4, decreases. The volume ratio of oxygen is a very important variable to the biomass gasification. It is concluded that increasing volume fraction of oxygen improves the volume fraction of H_2 and contributes to adjust H_2/CO ratio to an appropriate value. When the volume fraction of hydrogen is increased from 20% to 27.7%, H_2/CO ratio is improved from 0.38 to 0.75, which is adequate to synthesize the liquid fuel.