超临界流体
解聚
煤
制氢
热解
煤液化
氢
化学工程
煤气化
化学
液化
碳化学
废物管理
材料科学
有机化学
工程类
作者
Shixing Zhu,Hui Jin,Xiangjin Meng,Wenwen Wei,Zhisong Ou,Mengmeng Song,Liejin Guo
出处
期刊:Fuel
[Elsevier]
日期:2023-02-01
卷期号:333: 126319-126319
被引量:5
标识
DOI:10.1016/j.fuel.2022.126319
摘要
High efficiency gasification of inferior brown coal to produce hydrogen is a research focus and difficulty for clean utilization of coal resources. Abundant intermolecular hydrogen bonds in brown coal induce cross-linking side reactions of coal molecules in the pyrolysis process, which inhibits the efficient gasification of lignite. Based on the high temperature and pressure visualization reactor, it was found that alkaline subcritical liquid water would destroy the hydrogen bond structure in lignite, thus leading to the depolymerization of lignite particles. Based on this phenomenon, the crosslinking side reaction in the pyrolysis process can be suppressed at the molecular level. Therefore, a two-step method combined subcritical depolymerization with supercritical gasification was proposed to achieve high-efficiency gasification of brown coal for hydrogen production (the carbon gasification efficiency reached 98 % at 650 ∼ 700 °C). This provides a theoretical basis for the scheme design of clean and efficient gasification hydrogen production from inferior brown coal in supercritical water.
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