Gasification of biomass with steam and oxygen was carried over alkali-feldspar in a decoupled dual loop gasification (DDLG) system. This system has a moving bed reformer (MBR), a fluidized bed gasifier (FBG), a riser combustor (RC) and a particle grading cyclone (PGC). Through the PGC, two loops, i.e. a gasification loop of FBG-RC-PGC utlizing quartz sand as circulating bed material and a reforming loop of MBR-RC-PGC utilizing alkali-feldspar as circulating bed material, are formed. The effects of process variables such as reformer temperature, steam to biomass ratio (S/B) and air equivalence ratio (ER) on product gas composition, heating value, tar content, yield of product gas, carbon conversion, water conversion and cold gas efficiency were investigated. The maximum water conversion 35.2% and cold gas efficiency 82.3% were observed at reformer temperature 850 °C. The increase of S/B promoted the H₂-rich gas production and the maximum concentration of 42.1 vol % was achieved at the S/B of 1.0. In addition, the use of steam and oxygen together as gasification agent enhanced the tar removal and carbon conversion. The lowest tar content 1.1 g/Nm³ and high carbon conversion 97.2% were obtained at S/B of 0.6 and ER of 0.35.

在解耦双回路气化 (DDLG) 系统中，在碱长石上进行生物质与蒸汽和氧气的气化。该系统具有移动床重整器 (MBR)、流化床气化器 (FBG)、提升管燃烧器 (RC) 和颗粒分级旋流器 (PGC)。通过PGC，形成了以石英砂为循环床料的FBG-RC-PGC气化回路和以碱长石为循环床料的MBR-RC-PGC重整回路两个回路。重整器温度、蒸汽与生物质比 (S/B) 和空气当量比 (ER) 等过程变量对产品气体组成、热值、焦油含量、产品气体产率、碳转化率、水转化率和冷气的影响效率进行了调查。最大水转化率35.2%，冷气效率82。在重整器温度 850 °C 下观察到 3%。S/B的增加促进了H_{在 S/B 为 1.0 时实现了富2}气体产量和 42.1 vol% 的最大浓度。此外，使用蒸汽和氧气一起作为气化剂增强了焦油去除和碳转化率。在 S/B 为 0.6 和 ER 为 0.35 时获得最低焦油含量 1.1 g/Nm ³和高碳转化率 97.2%。