中国电机工程学报Issue(26)：14-20,7.
空气燃烧与O2/CO2燃烧气氛下水蒸气对石灰石煅烧/硫化特性的影响
Effect of Water Vapor on Indirect Sulfation During Air and O2/CO2 Combustion
摘要
Abstract
A tube furnace was employed to investigate the indirect sulfation characteristics of American and Yixing limestones during air or O2/CO2 combustion. The effects of water vapor concentration on calcium conversion of the two limestone sorbents in the two combustion atmospheres were analyzed, besides, the pore structure characteristics, morphology and ingredients of the sulfation products were analyzed. Results show that the presence of water vapor has a negligible effect on calcium conversion at the initial stage of reaction, and promotes the sulfation obviously at the later stage. The presence of water vapor promotes the solid-state diffusion in the product layer, and the crystal grain size of product in a wet atmosphere is much larger. The large-size particles reduce the resistance of gas-solid diffusion and provide more reaction sites for the reactant and the sorbents before the sulfation is sufficient. Sintering of product layer is promoted in the presence of water vapor. Vacancies in the product migrate along crystal grain boundaries and through the crystal lattice, resulting in a reverse flow of mass into the pores.关键词
O2/CO2燃烧/煅烧后硫化/水蒸气/孔结构特征/X射线衍射分析Key words
O2/CO2 combustion/indirect sulfation/water vapor/pore structure character/X-ray diffraction分类
资源环境引用本文复制引用
姜中孝,段伦博,陈晓平,赵长遂..空气燃烧与O2/CO2燃烧气氛下水蒸气对石灰石煅烧/硫化特性的影响[J].中国电机工程学报,2013,(26):14-20,7.基金项目
国家自然科学基金项目(51206023)。Project Supported by National Natural Science Foundation of China (51206023) （51206023）
