Alkali removal with mineral sorbents - Part I: Sorption capacity and reaction kinetics

被引：11

作者：

Kerscher, Florian ^{[1
]}

Spliethoff, Hartmut ^{[1
,2
]}

机构：

[1] Tech Univ Munich, Chair Energy Syst, Boltzmannstr 15, D-85748 Garching, Germany

[2] Bavarian Ctr Appl Energy Res, Walther Meissner Str 6, D-85748 Garching, Germany

来源：

POWDER TECHNOLOGY | 2021年 / 390卷

关键词：

Solid fuel conversion; Alkali removal; Mineral sorbents; Kinetic studies; Thermogravimetric analysis; FLY-ASH ADDITION; COAL COMBUSTION; BIOMASS; TEMPERATURE; GAS; DEPOSITION; MECHANISM; CAPTURE; ADSORPTION; OPERATION;

D O I：

10.1016/j.powtec.2021.05.074

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Aluminosilicate sorbents show the potential to reduce alkali-related problems during solid fuel conversion such as deposit build-up and corrosion damages. The alkali capacity, the reaction kinetics and the surface area devel-opment of the sorbents under operating conditions are essential parameters for the mathematical description of the alkali sorption. In this work, three sorbents, kaolin, bauxite and bentonite, are characterized in this regard by thermogravimetric analysis. The sorption behavior of kaolin surpasses the other sorbents dueto the highest load-ing capacity and the temperature-stability of the porous structure. However, the suitability as sorbent in solid fuel conversion processes is given for all materials. A mathematical sorption model is applied to the experimental data in order to derive kinetic parameters of the sodium and potassium sorption under syngas and flue gas atmo-sphere. Thus, this work provides the necessary dataset for the design and optimization of the sorbent use in in-dustrial processes. (c) 2021 Elsevier B.V. All rights reserved.

引用

页码：190 / 196

页数：7

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