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水蒸气对钙基吸收剂循环煅烧/碳酸化CO2捕集过程中孔结构的影响

DOI: 10.13334/j.0258-8013.pcsee.2015.02.017, PP. 390-395

Keywords: 钙基吸收剂,煅烧/碳酸化,孔结构,水蒸气,影响机理

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Abstract:

利用自制等温测量热重实验台,对钙基吸收剂循环煅烧/碳酸化工艺中水蒸气对吸收剂孔结构影响进行了研究。仅煅烧阶段含有水蒸气时,转化率最低,而仅碳酸化阶段存在水蒸气时,取得最高的碳酸化转化率。煅烧阶段和碳酸化阶段均含有水蒸气与仅碳酸化阶段存在水蒸气转化率类似。采用氮吸附测试了典型工况下的CaO孔结构。随着循环次数增加,碳酸化转化率降低,比表面积、孔容积逐渐减小。推测煅烧阶段水蒸气通过烧结降低了碳酸化转化率。碳酸化阶段水蒸气通过催化作用提高了转化率,此时孔结构作用并不占主动地位。煅烧和碳酸化均存在水蒸气时,碳酸化阶段水蒸气催化作用更加明显。

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