Big problem, little answer: overcoming bed agglomeration and reactor slagging during the gasification of barley straw under continuous operation
Big problem, little answer: overcoming bed agglomeration and reactor slagging during the gasification of barley straw under continuous operation
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DOI：
10.1039/d0se00155d
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发表时间：
2020-07-01
影响因子：
5.6
通讯作者：
Skoulou, Vasiliki
中科院分区：
文献类型：
--
作者：
Alabdrabalameer, Hassan A.;Taylor, Martin J.;Skoulou, Vasiliki
由于反应器床团聚而产生的脱流是与木质纤维生物质废物气化有关的全球性挑战，特别是其高无机含量。大麦秸秆是一种灰分含量很高的废物原料，人们一直在仔细研究使用传统的水浸方法来去除大麦秸秆中的无机成分。随后在750℃和850℃的连续流动下对所得到的预处理材料进行气化，通过扫描电子显微镜和能谱研究发现，由于灰烬熔化诱导机理而导致的床层团聚可以被消除。在这里，共晶混合物的存在导致富含SiO(2)的床层材料熔化，导致反应器中的压力骤降，导致强制关闭。浸出大麦秸秆能有效地解决这一问题，并可长期持续气化，并限制反应后床料颗粒表面的无机基装饰。此外，还发现浸出能增加低碳燃料气的生产，与未经处理的当量气体相比，在850℃时，CO和CH(4)的产品产率分别提高了31.9%和37.3%。
Defluidisation as a result of reactor bed agglomeration is a global challenge associated with the gasification of lignocellulosic biomass waste, specifically its high inorganic content. The use of conventional water leaching has been scrutinised for the removal of inorganic constituents from barley straw, a highly abundant waste feedstock with a high ash content. The resulting pre-treated material was subsequently gasified at 750 degrees C and 850 degrees C under continuous flow, where it was found that bed agglomeration as a result of the ash melting induced mechanism can be eliminated, as visualised by SEM and EDX studies. Here, the presence of eutectic mixtures result in the fusing of a SiO(2)rich bed material that causes a sudden pressure drop in the reactor, resulting in a forced shutdown. Leached barley straw was found to effectively solve this issue and sustained gasification for a long period of time, as well as limiting inorganic based decoration on the surface of bed material grains after reaction. Additionally, leaching was found to enhance the production of low carbon fuel gases where an improved product yield of 31.9 vol% and 37.3 vol% for CO and CH(4)was observed at 850 degrees C, as compared to untreated equivalent.