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Catalytic gasification of coal in a decoupled dual loop gasification system over alkali-feldspar
Journal of the Energy Institute ( IF 5.7 ) Pub Date : 2021-06-08 , DOI: 10.1016/j.joei.2021.06.003
Muhammad Mahmood Khan , Shaoping Xu , Wang Chao

The catalytic gasification of Yuyang coal for the production of hydrogen-rich syngas has been performed in a novel decoupled dual loop gasification system using alkali-feldspar as an in-situ catalytic bed material. This experimental setup is comprised of a fluidized bed gasifier (FBG), a moving bed reformer (MBR), a riser combustor (RC) and a particle grading cyclone (PGC). By the PGC, two loops, i.e. a gasification loop with quartz sand as circulating bed material between the FBG and the RC and a reforming loop with alkali-feldspar as circulating bed material between the MBR and the RC, are formed. The effects of process parameters such as reformer temperature (700–850 °C), steam/coal ratio (S/C) (0.6–1.5) and air equivalence ratio (ER) (0.15–0.30) on the composition of product gas, lower heating value (LHV), tar content, yield of product gas, the carbon and water conversions and the cold gas efficiency were investigated. At the reformer temperature of 850 °C, the lowest tar content 5.8 g/Nm3 and the maximum yield of product gas 1.0 Nm3/kg daf were obtained. The addition of steam increased the H2 yield. The maximum hydrogen concentration of 65.1 vol% in product gas was attained at the S/C ratio of 1.5. Oxygen as a part of gasification agent led to the rise of CO2 concentration from 24.3 to 46.3 vol% and the reduction of H2 concentration from 54.4 to 33.0 vol% with the increase of ER from 0.15 to 0.30.



中文翻译:

脱耦双回路气化系统中煤在碱长石上的催化气化

使用碱长石作为原位催化床材料,在新型解耦双回路气化系统中进行了用于生产富氢合成气的鱼阳煤的催化气化。该实验装置由流化床气化器 (FBG)、移动床重整器 (MBR)、提升管燃烧器 (RC) 和颗粒分级旋流器 (PGC) 组成。通过PGC,形成两个回路,即FBG与RC之间以石英砂为循环床料的气化回路和MBR与RC之间以碱长石为循环床料的重整回路。重整炉温度 (700–850 °C)、蒸汽/煤比 (S/C) (0.6–1.5) 和空气当量比 (ER) (0.15–0.30) 等工艺参数对产品气组成的影响,较低的热值 (LHV)、焦油含量、产气量、研究了碳和水的转化率和冷气效率。在 850 °C 的重整炉温度下,最低焦油含量为 5.8 g/Nm获得了 3和最大产气量 1.0 Nm 3 /kg daf。蒸汽的加入增加了H 2产率。在 S/C 比为 1.5 时,产品气体中的最大氢气浓度达到 65.1 vol%。随着ER从0.15增加到0.30,氧气作为气化剂的一部分导致CO 2浓度从24.3 vol%上升到46.3 vol%,H 2浓度从54.4 vol%下降到33.0 vol%。

更新日期:2021-06-17
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