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烧结对钙基吸收剂循环煅烧/碳酸化捕集CO2影响

DOI: 10.13334/j.0258-8013.pcsee.2014.35.003, PP. 6271-6278

Keywords: 钙基吸收剂,循环煅烧/碳酸化,烧结,水蒸气,孔结构

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Abstract:

利用自制可实现等温热重测量实验系统,研究了烧结对钙基吸收剂循环煅烧/碳酸化捕集CO2的影响,测试了几种主要的烧结影响因素(时间、水蒸气、温度、粒径等)的作用规律,并结合孔结构特性进行了分析。烧结时间延长,无论是碳酸化反应速率还是最终转化率均明显下降,尤其在快速化学反应控制阶段;水蒸气对不同烧结时间CaO的影响差异显著,温度升高,烧结加剧,CaO碳酸化转化率加剧下降;对于3个延长烧结时间下的CaO,中等粒径的CaO(150~250μm)取得最高碳酸化转化率。烧结时间的延长总是会降低CaO的比表面积和孔容积。对延长烧结0min的CaO,水蒸气会明显减小其比表面积和孔容积,但对于延长烧结6min和12min的CaO,趋势正好相反。

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