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在单批次进料小型流化床上,以稻壳为生物质燃料,研究了床料、气化温度、水蒸气体积分数以及载氧体载氧量与生物质含碳量的摩尔比(O/C)对生物质化学链气化反应特性的影响,并考察了铁矿石的长期交替氧化还原过程中的反应特性,分析了在小型流化床,水蒸气气氛气化条件下,铁矿石载氧体在反应过程中主要的反应以及反应后的铁矿石的床料变化。研究表明:在载氧体条件下,生物质的碳转化率显著增大,随着反应温度的升高,合成气中的H_2和CO的体积分数也相应升高。在温度不变情况下,随着水蒸气比例的升高,CO_2和H_2的体积分数显著上升。伴随着O/C摩尔比的升高,CO和H_2均显著下降。因此,在不同的反应条件下,铁矿石在生物质化学链气化过程中对反应速度、合成气比例等均有明显的作用,对研究生物质的综合利用具有一定的意义。
In a single batch feed small fluidized bed, using rice husk as biomass fuel, the effects of bed material, gasification temperature, water vapor volume fraction and mole ratio of oxygen carrier oxygen content to biomass carbon content O / C) on the gasification reaction characteristics of biomass chemical chain, and investigated the reaction characteristics of iron ore in the long-term alternating redox process. It was analyzed that under the conditions of small-scale fluidized bed and steam gasification, The main reaction of ore oxygen carrier in the reaction process and the change of bed material of iron ore after the reaction. The results show that under the condition of oxygen carrier, the carbon conversion rate of biomass increases significantly. With the increase of reaction temperature, the volume fraction of H 2 and CO in syngas increases accordingly. Under the condition of constant temperature, the volume fraction of CO 2 and H 2 increased significantly with the increase of water vapor ratio. With the increase of O / C molar ratio, CO and H 2 decreased significantly. Therefore, under different reaction conditions, the iron ore plays an obvious role in the chemical chain gasification process of the biomass, and has a significant effect on the reaction rate and the proportion of the syngas, which is of great significance to the comprehensive utilization of the research biomass.