中国电机工程学报2015，Vol.35Issue(20)：5251-5257,后插11,8.DOI:10.13334/j.0258-8013.pcsee.2015.20.016
粉煤灰改性钙基吸收剂循环碳酸化实验研究
Study on Cyclic Carbonation Property of CaO-based Sorbents Modified With Fly Ash
摘要
Abstract
Calcium looping cycle is one of the most promising technologies for CO2 capture, which is based on the reversible carbonation reaction of CaO. The calcium based sorbents were attempted to be modified with fly ash to enhance its CO2 capture capacity. The modification conditions were optimized by changing the hydration solution and pretreating the fly ash with grinding, calcination or alkali treatment. The carbonation property of the modified sorbents was investigated. The composition of and microstructure of the preferable modified sorbents were also analyzed to reveal the mechanism of CO2 capture capacity enhancement. Results show that higher CO2 capture performance is achieved for the sorbent modified by coal fly ash in hydration compared with the pure CaO. The sorbents modified with coal fly ash in hydration with 50% acetic acid solution (CaO/FA Hyd(50%CA)) presented better CO2 capture performance compared with other modified sorbents. Carbonation conversion of CaO/FA Hyd(50%CA) is 84% higher than that of CaO after 8 cycles. Besides, sorbents modified by pretreatment of fly ash with grinding, calcination or alkaline leaching presented higher CO2 capture capacity than those without fly ash treatment. The composition analysis of these sorbents showed that CaSiO3 and Ca12Al14O33 was generated during the initial calcination and multiple cycles, which can restrain the sintering of sorbents leading to the improvement in surface area and pore volume of sorbents and thus the activity of sorbents.关键词
钙基吸收剂/粉煤灰/碳酸化转化率/二氧化碳捕集Key words
calcium-based sorbent/fly ash/carbonation conversion/CO2 capture分类
化学化工引用本文复制引用
陈惠超,王芳,赵伶玲,赵长遂..粉煤灰改性钙基吸收剂循环碳酸化实验研究[J].中国电机工程学报,2015,35(20):5251-5257,后插11,8.基金项目
国家青年科学基金项目(51206024) （51206024）
中国博士后科学基金项目(2011M500837). Project Supported by National Natural Science Foundation of China (51206024) （2011M500837）
Project Supported by Special Scientific and Research Funds for Doctoral Speciality of Institution of Higher Learning (2011M500837). （2011M500837）
