Oxy-fuel combustion in circulating fluidized bed boilers
Oxy-fuel combustion in circulating fluidized bed boilers
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DOI：
10.1016/j.apenergy.2014.03.050
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发表时间：
2014-07
期刊：
影响因子：
11.2
通讯作者：
B. Leckner;A. Gómez-Barea
中科院分区：
文献类型：
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作者：
B. Leckner;A. Gómez-Barea
研究了循环流化床（CFB）含氧锅炉的co2还原条件，即在纯氧条件下运行，用循环烟气稀释以缓和燃烧过程。本文分析了两种情况：一种是准备转换的情况，即普通的空气循环流化床锅炉，仅对其进行了轻微修改，以氧气代替空气进行二氧化碳捕获；另一种是更普遍的选择，即全新的设计，在全氧燃料循环流化床锅炉的输入中采用高浓度氧气。研究发现，在给定的燃料负荷下，准备转化工况下维持循环流化床性能的相关参数（床层温度和流化速度）不可能完全等于空燃工况下的参数，必须找到某种折衷办法。根据氧浓度和相应的烟气再循环，新设计的情况下，锅炉比可比的空燃情况小。这种情况有望有助于降低二氧化碳去除的成本。
The conditions for CO2reduction in a circulating fluidized bed (CFB) oxy-boiler are studied, that is, operation with pure oxygen, diluted by recirculated flue gases to moderate the combustion process. Two cases are analyzed: the ready-to-convert case, a normal air-fired CFB boiler, only slightly modified to be operated with oxygen instead of air for CO2capture, and a more general option, an entirely new design, employing high oxygen concentration in the input to the oxy-fuel CFB boiler. It is found that at a given fuel load, the relevant parameters for maintaining the CFB performance (bed temperature and fluidization velocity) in the ready-to-convert case cannot be kept entirely equal to those in the air-fired case, and some compromise has to be found. The new-design case results in a smaller boiler than that of the comparable air-fired case, depending on the oxygen concentration and the corresponding flue-gas recirculation. This case is expected to contribute favorably to reduction of the cost of CO2removal.