The role of limestone during fluidized bed oxy-combustion of coal and biomass

被引：29
作者：
Lupianez, Carlos [1 ]
Carmen Mayoral, M. [2 ]
Diez, Luis I. [1 ]
Pueyo, Eloy [1 ]
Espatolero, Sergio [1 ]
Manuel Andres, J. [2 ]
机构：
[1] Univ Zaragoza, CIRCE, Campus Rio Ebro, Zaragoza 50018, Spain
[2] CSIC, Inst Carboquim, Miguel Luesma 4, Zaragoza 50018, Spain
来源：
APPLIED ENERGY | 2016年 / 184卷
关键词：
Oxy-combustion; Limestone; Emissions; Deposition; Biomass; Fluidized beds; FUEL COMBUSTION; CO2; CAPTURE; CHLORINE DEPOSITION; OXYFUEL COMBUSTION; SULFUR RETENTION; FIRING COAL; BIO-CCS; EMISSIONS; SULFATION; ASH;
D O I：
10.1016/j.apenergy.2016.11.018
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
The interest in bio-CCS technologies is growing due to their potential to reduce CO2 emission in power generation. Oxy-co-firing in fluidized-bed units is one of the available techniques to develop bio-CCS, offering wide fuel flexibility and low SO2 and NOx emissions. This paper discusses the results of an experimental campaign carried out in a lab-scale fluidized bed reactor. The work focuses on the influence of limestone when oxy-firing blends of lignite and corn stover. Two different types of limestone with two Ca:S molar ratios were tested, and operational conditions were selected to compare the mechanisms governing desulphurization. Emissions of SO2, NO and HCI, together with deposition rates and ash mineralogy are studied in the paper. SO2 capture increases with the Ca:S ratio and bed temperature, but to a different extent depending on the limestone fragmentation. The amount of NO emitted rises with the Ca:S ratio and the presence of calcined limestone (indirect desulphurization). The HCI concentration in the gas phase is dominated by alkali sulfation. Finally, the conditions for the highest desulphurization efficiency diminished the deposition rates, but increased the risk for chlorine-induced corrosion. (C) 2016 Elsevier Ltd. rights reserved.
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收藏
页码：670 / 680
页数：11
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