Coal fly ash-bound limestone-derived sorbent pellets for high-temperature CO2 capture

吸附剂 碳化作用 钙环 粉煤灰 颗粒 石灰 化学工程 材料科学 煅烧 水泥 淘洗 氧化钙 矿物学 抗压强度 吸附 化学 冶金 复合材料 有机化学 工程类 催化作用
作者
Long Jiang,Yuxuan Zhang,Pengjie Kong,Liang Cheng,Gaojun Liu,Jian Sun
出处
期刊:Carbon Capture Science & Technology [Elsevier]
卷期号:10: 100155-100155 被引量:4
标识
DOI:10.1016/j.ccst.2023.100155
摘要

Poor CO2 capture stability and serious elutriation are the issues commonly occur when limestone circulating in the fluidized bed-based Calcium Looping (CaL) system. Hence, three types of coal fly ash-bound (CFA-bound) limestone-derived sorbents were synthesized via mixing the limestone, calcined lime and hydrated lime with coal fly ash, respectively. The generated ternary Ca-Al-O and Ca-Si-O phases offer structural stability for CFA-bound limestone-derived sorbents and improve their cyclic CO2 capture performance. Moreover, extrusion-spheronization method was adopted to produce CFA-bound limestone and hydrated lime sorbent pellets to synergistically enhance cyclic CO2 capture capability and mechanical properties. It is found that hydrated lime is superior to limestone as the calcium precursor to prepare CaO-based sorbent pellets due to its desirable pore structure and high binding force. Therefore, the CFA-bound hydrated lime pellets containing 15 wt % of fly ash (HL/CFA15-P) exhibits a high carbonation conversion of 40% after 17 cycles, which is nearly 1.4 times that of limestone pellets. The discrepancy on carbonation conversion between the two sorbent pellets is enlarged to ∼1.6 times after 100 cycles, which is calculated using a semi-empirical equation. Moreover, HL/CFA15-P exhibits outstanding mechanical property, whose compressive strength reaches 6±1.7 MPa, which is comparable to the cement-bound CaO-based sorbent pellets.
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