Limestone Calcination with CO 2 Capture (II): Decomposition in CO 2/Steam and CO 2/N 2 Atmospheres
Limestone Calcination with CO 2 Capture (II): Decomposition in CO 2/Steam and CO 2/N 2 Atmospheres
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DOI：
10.1021/ef800039k
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发表时间：
2008-06
期刊：
影响因子：
8.8
通讯作者：
Yin Wang;Shiying Lin;Yoshizo Suzuki
中科院分区：
文献类型：
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作者：
Yin Wang;Shiying Lin;Yoshizo Suzuki
在蒸汽稀释气氛（20 - 100%CO2中的蒸汽）中，利用连续运行的流化床反应器对石灰石颗粒（0.25 - 0.5 mm）的分解进行了研究。石灰石的分解转化率随CO2供给气中水蒸气稀释率的增加而增加。在床层温度为1193 K时，未稀释（100% CO2）时转化率为72%，用60%水蒸气稀释时转化率为98%。蒸汽稀释和N2稀释的分解转化率有很大的不同，这一结果可以用蒸汽和N2稀释气氛中颗粒传热的差异来解释。采用水化反应和碳酸化反应测试了石灰石在水蒸气稀释和未稀释（10 0% CO2）条件下分解生成的CaO的反应活性。在水化试验中，水蒸汽稀释法生产的CaO完全转化[CaO → Ca（OH）2]所需的时间约为水蒸汽稀释法生产的CaO所需时间的一半。
Decomposition of limestone particles (0.25−0.5 mm) in a steam dilution atmosphere (20−100% steam in CO 2) was investigated by using a continuously operating fluidized bed reactor for CO 2 capture. The decomposition conversion of limestone increased as the steam dilution percentage in the CO 2 supply gas increased. At a bed temperature of 1193 K, the conversions were 72% without dilution (100% CO 2) and 98% with 60% steam dilution. The decomposition conversions obtained with steam dilution and N 2 dilution differed significantly, and this result is explained in terms of the difference between the heat transfer to particle in steam and N 2 dilution atmosphere. The reactivities of the CaO produced from limestone decomposition with steam dilution and without dilution (100% CO 2) were tested by means of hydration and carbonation reactions. In the hydration test, the time required for complete conversion [CaO → Ca(OH) 2] of the CaO produced by steam dilution was approximately half that required for the CaO prod...