The role of limestone during fluidized bed oxy-combustion of coal and biomass
The role of limestone during fluidized bed oxy-combustion of coal and biomass
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DOI：
10.1016/j.apenergy.2016.11.018
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发表时间：
2016-12-15
期刊：
影响因子：
11.2
通讯作者：
Manuel Andres, J.
中科院分区：
文献类型：
--
作者：
Lupianez, Carlos;Carmen Mayoral, M.;Manuel Andres, J.
人们对生物CCS技术的兴趣与日俱增，因为它们具有减少发电过程中二氧化碳排放的潜力。在沸腾床装置中进行氧混烧是开发生物CCS的有效技术之一，具有燃料灵活性广、SO2和NOx排放低等优点。本文讨论了在实验室规模的沸腾床反应器中进行的实验活动的结果。重点研究了褐煤和玉米秸秆氧烧混合时石灰石的影响。试验了两种不同钙：S摩尔比的石灰石，并选择了不同的操作条件，比较了两种石灰石的脱硫机理。本文研究了SO2、NO和HCI的排放，以及沉积速率和灰矿物学。脱硫率随钙S比和床温的升高而增加，但随石灰石破碎程度的不同而不同。NO排放量随钙S比和石灰石煅烧(间接脱硫)的存在而增加。气相中的HCl浓度以碱式硫酸盐化为主。最后，获得最高脱硫效率的条件降低了沉积速度，但增加了氯气腐蚀的风险。(C)2016爱思唯尔有限公司版权所有。
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.