Chemical-looping gasification reaction characteristics and mechanism of coal and Fe-based composite oxygen carriers

CHENG Yu; LIU Yongzhuo; TIAN Hongjing; GUO Qingjie

doi:10.3969/j.issn.0438-1157.2013.07.038

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Chemical-looping gasification reaction characteristics and mechanism of coal and Fe-based composite oxygen carriers

更新时间：2025-12-10

- Chemical-looping gasification reaction characteristics and mechanism of coal and Fe-based composite oxygen carriers
- CIESC Journal Issue 7, Pages: 2587-2595(2013)
- 作者机构：
  
  青岛科技大学化工学院, 清洁化工过程山东省高校重点实验室,山东,青岛,266042
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2013.07.038
  CLC： Q546TK16X705
- Online First：05 July 2013，
  
  Published：05 July 2013
- 稿件说明：
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CHENG Yu, LIU Yongzhuo, TIAN Hongjing, et al. Chemical-looping gasification reaction characteristics and mechanism of coal and Fe-based composite oxygen carriers[J]. CIESC Journal, 2013, (7): 2587-2595.
DOI：

CHENG Yu, LIU Yongzhuo, TIAN Hongjing, et al. Chemical-looping gasification reaction characteristics and mechanism of coal and Fe-based composite oxygen carriers[J]. CIESC Journal, 2013, (7): 2587-2595. DOI： 10.3969/j.issn.0438-1157.2013.07.038.

摘要

以水蒸气作为气化/流化介质

在流化床中研究了两种铁基复合载氧体的化学链气化反应特性及循环特性

并对气化过程中的反应机理、动力学方程进行了推断。结果表明:温度为920℃时

添加不同修饰物的铁基复合载氧体与煤焦气化的反应活性依次为Fe4Al6K1>Fe4Al6>Fe4Al6Ni1。在多次循环实验过程中

合成气成分保持稳定

表明Fe4Al6K1复合载氧体循环特性良好。XRD谱图分析表明

六次氧化还原实验后的铁基载氧体氧化态仍为Fe2O3。K+主要以铁酸钾形态存在

该结构有利于促进化学链气化反应。利用高斯函数对气化反应速率进行了峰拟合

拟合结果表明化学链气化主要分为3个阶段:化学链作用阶段、煤气化阶段以及Fe3O4向FeO转变的气化阶段。

Abstract

An investigation into chemical-looping gasification (CLG)of coal with K2CO3 and NiO-decorated Fe2O3 oxygen carrier in a fluidized bed reactor

using steam as the gasification-fluidization medium

was carried out.The reactivity and regeneration of two kinds of Fe2O3 composite oxygen carriers in multi-cycles

as well as the mechanism and kinetics model of the gasification process

were presented.At 920℃

the reactivity order was as follow:Fe4Al6K1>Fe4Al6>Fe4Al6Ni1.X-ray diffraction (XRD)images showed that the Fe4Al6K1 composite oxygen carrier was completely regenerated after 6 cycle redox experiments

and potassium ferrites were formed during the calcinations process

whose structure could boost the reactivity of Fe-based oxygen carrier.Fe4Al6K1 particles were excellent oxygen carriers for chemical-looping gasification of coal.Finally

the peak fitting technique was used to analyze the gasification reaction rate curve describing the reaction mechanism of coal and Fe2O3 composite oxygen carrier.It indicated that complex reactions of CLG included three stages

the reaction between Fe2O3

coal char and steam

the gasification of coal char

and the reaction of Fe3O4 to FeO.

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