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Fundamental Study of Indirect vs Direct Sulfation under Fluidized Bed Conditions

文献类型：期刊论文

作者Wang, Liyong1; Li, Shiyuan2; Eddings, Eric G.1
刊名INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
出版日期2015-04-15
卷号54期号:14页码:3548-3555
英文摘要Direct dry sorbent injection is a relatively simple and low-cost process for the capture of SO2 emissions, particularly for in-bed capture during fluidized bed combustion. SO2 capture by limestone may be accomplished by either direct or indirect sulfation, depending on gas-phase environment and operating conditions. In this paper, a combination of thermogravimetric analysis (TGA) and a bench-scale bubbling fluidized bed reactor were used to study sulfation, calcination and carbonation behavior of limestone at different CO2 concentrations and various temperatures to identify the relative contributions of indirect and direct sulfation reactions under air- or oxy-fired fluidized bed combustion conditions. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy analyses were also used to help identify product layer microstructure and composition. A significant temperature dependence on the sulfation of limestone was seen under oxy-fired conditions (when direct sulfation dominates); however, limited temperature dependence was seen for air-fired conditions (where indirect sulfation dominates). A distinct CaSO4 product layer is seen in SEM images for the air-firing condition that can significantly inhibit gas transport into internal pores. No such distinct product layer was seen for oxy-firing conditions. For the size range of limestone used in this study (600 to 1000 mu m), indirect sulfation (dominant under air-fired conditions) appeared to be strongly limited by diffusion, whereas direct sulfation (dominant under oxy-fired conditions) was mainly under kinetic control or a mixture of kinetic and diffusion control.
WOS标题词Science & Technology ; Technology
类目[WOS]Engineering, Chemical
研究领域[WOS]Engineering
关键词[WOS]PULVERIZED COAL COMBUSTION ; CALCIUM-BASED SORBENTS ; SHORT-TIME SULFATION ; HIGH-TEMPERATURE ; LIMESTONE ; SO2 ; NOX ; CO2 ; CALCINATION ; EMISSIONS
收录类别SCI
语种英语
WOS记录号WOS:000353177800002
公开日期2015-12-22
源URL[http://ir.etp.ac.cn/handle/311046/98944]  
专题工程热物理研究所_中国科学院工程热物理所（论文库）_期刊论文（SCI）
作者单位1.Univ Utah, Dept Chem Engn, Salt Lake City, UT 84112 USA
2.Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Liyong,Li, Shiyuan,Eddings, Eric G.. Fundamental Study of Indirect vs Direct Sulfation under Fluidized Bed Conditions[J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,2015,54(14):3548-3555.
APA Wang, Liyong,Li, Shiyuan,&Eddings, Eric G..(2015).Fundamental Study of Indirect vs Direct Sulfation under Fluidized Bed Conditions.INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,54(14),3548-3555.
MLA Wang, Liyong,et al."Fundamental Study of Indirect vs Direct Sulfation under Fluidized Bed Conditions".INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 54.14(2015):3548-3555.

入库方式： OAI收割

来源：工程热物理研究所

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