Direct Sulfation of Limestone Based on Oxy-Fuel Combustion Technology

被引:15
|
作者
Chen, Chuanmin [1 ]
Zhao, Changsui [2 ]
Liu, Songtao [1 ]
Wang, Chuanbo [3 ]
机构
[1] N China Elect Power Univ, Sch Environm Sci & Engn, Baoding 071003, Peoples R China
[2] Southeast Univ, Minist Educ, Key Lab Clean Coal Power Generat & Combust Techno, Nanjing, Peoples R China
[3] N China Elect Power Univ, Sch Energy & Power Engn, Baoding 071003, Peoples R China
基金
芬兰科学院;
关键词
direct sulfation; limestone; oxyfuel combustion; desulfurization; O-2/CO2 COAL COMBUSTION; CO2 PARTIAL PRESSURES; CALCIUM-CARBONATE; PFBC CONDITIONS; SORBENT; CRYSTALLIZATION; DIFFUSION; PARTICLES; FRACTURE; CAPTURE;
D O I
10.1089/ees.2008.0195
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
With limestone as the sorbent, the sulfation reaction can proceed via two different routes depending on whether calcination of the limestone takes place under the given reaction conditions. The direct sulfation reaction is defined as the sulfation reaction between sulfur dioxide (SO(2)) and limestone in an uncalcined state. This reaction, based on oxyfuel combustion technology, was studied by thermogravimetric analysis. Surface morphologies of the limestone particles after sulfation were examined by a scanning electron microscope. Results show that there are more pores or gaps in the product layer formed by direct sulfation of limestone than by indirect sulfation, which can be attributed to the generation of carbon dioxide (CO(2)) at a reaction interface. Compared with indirect sulfation, direct sulfation of limestone can yield much higher conversion and has a much higher reaction rate. For direct sulfation, the greater porosity in the product layer greatly reduces the solid-state ion diffusion distance, resulting in a higher reaction rate and higher conversion.
引用
收藏
页码:1481 / 1488
页数:8
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