Co-gasification of Biomass and Non-biomass Feedstocks: Synergistic and Inhibition Effects of Switchgrass Mixed with Sub-bituminous Coal and Fluid Coke During CO2 Gasification
Co-gasification of Biomass and Non-biomass Feedstocks: Synergistic and Inhibition Effects of Switchgrass Mixed with Sub-bituminous Coal and Fluid Coke During CO2 Gasification
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DOI：
10.1021/ef301567h
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发表时间：
2013-01-01
期刊：
影响因子：
5.3
通讯作者：
Hill, Josephine M.
中科院分区：
文献类型：
--
作者：
Habibi, Rozita;Kopyscinski, Jan;Hill, Josephine M.
对生物质（即柳枝稷）与煤和流态焦进行共气化，以研究气化催化剂对混合原料（特别是柳枝稷中天然存在的碱金属和碱土金属元素）的有效性。通过热重分析法在750℃至950℃的温度和大气压下测量单一材料和混合材料的二氧化碳气化速率。与单独的速率相比，催化剂对混合原料气化速率产生的迅速且持久的影响表明其具有较高的颗粒间迁移率。柳枝稷 - 煤混合物表现出失活（拮抗作用），这归因于移动的碱金属元素与煤中的铝硅酸盐矿物反应形成无活性的碱金属铝硅酸盐（如KAlSi₃O₈和KAlSiO₄）而被固定。当进料混合物中存在过量的碱以满足这些失活反应的化学计量要求时，剩余的催化活性是明显的。在柳枝稷与几乎没有干扰性无机物的流态焦共气化时，混合原料的气化过程中出现了协同作用。研究结果记录了燃料混合物、煤或焦炭灰分的组成以及气化温度对这种行为的影响。
Co-gasification of biomass, namely, switchgrass, with coal and fluid coke was performed to investigate the availability of the gasification catalysts to the mixed feedstock, especially alkali and alkaline earth elements, naturally present on switchgrass. Rates of CO2 gasification of the single and mixed materials were measured at temperatures between 750 and 950 degrees C and atmospheric pressure by thermogravimetry. High interparticle mobility of the catalysts is indicated by a prompt and lasting effect on the mixed feed gasification rate when compared with the separate rates. The switchgrass coal mixtures show a deactivation (antagonism), attributed to sequestration of the mobile alkali elements by reaction with aluminosilicate minerals in coal to form inactive alkali aluminosilicates, such as KAlSi3O8 and KAlSiO4. Remaining catalytic activity is evident when excess alkali is present in the feed mixture to satisfy the stoichiometric requirements of these deactivation reactions. In co-gasification of switchgrass with fluid coke, which has little interfering inorganic matter, a synergism is noted in the gasification of the mixed feed. The results document the effects of fuel mixture, composition of the coal or coke ash, and the gasification temperature on this behavior.