4.7 Article

Alkali-wall interactions in a laboratory-scale reactor for chemical looping combustion studies

期刊

FUEL PROCESSING TECHNOLOGY
卷 217, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.fuproc.2021.106828

关键词

Laboratory-scale reactor; Alkali; Chemical looping combustion; Surface ionization detector; High temperature corrosion

资金

  1. Swedish Research Council [2016-06023]
  2. Swedish Research Council [2016-06023] Funding Source: Swedish Research Council

向作者/读者索取更多资源

The study investigates the interactions of alkali metal-containing compounds with reactor walls at high temperatures, showing complex effects on adsorption and re-evaporation, with the potential formation of new stable potassium-rich phases under reducing conditions. Transient changes in alkali concentration during redox cycles are observed, indicating the extensive and dynamic nature of these wall effects.
Alkali metal-containing compounds are readily released during thermal conversion of solid fuels, and may have both detrimental and beneficial effects on chemical looping combustion. Here, we characterize alkali interactions with the inner walls of a laboratory-scale reactor under oxidizing, reducing and inert conditions at temperatures up to 900 ?C. KCl aerosol particles are continuously introduced to the stainless steel reactor and the alkali concentration is measured on-line with a surface ionization detector. Aerosol particles evaporate at temperatures above 500 ?C and KCl molecules rapidly diffuse to the reactor wall. Up to 92% of the alkali reaching the wall below 700 ?C remains adsorbed, while re-evaporation is important at higher temperatures, where up to 74% remains adsorbed. Transient changes in alkali concentration are observed during repeated redox cycles, which are associated with changes in chemical composition of the wall material. Metal oxides on the reactor wall are partially depleted under reducing conditions, which allow for the formation of a new potassium-rich phase that is stable in a reducing atmosphere, but not under inert conditions. The observed wall effects are concluded to be extensive and include major transient effects depending on gas composition, and the implications for laboratory studies and improved experimental methodology are discussed.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据