Abstract: Nowadays，the study for CO2 capture with Ca-based sorbent from coal combustion has gained much attention.In this paper，the lattice Boltzmann method (LBM)is used to study the carbonation of porous CaO with CO2.The most popular LBM is the lattice Bhatnagar-Gross-Krook (LBGK)model.However，when LBGK model is used to simulate porous flows，the numerical instability and viscosity-dependence of boundary conditions will result in viscosity-dependent permeability.While the multiple-relaxation-time (MRT)LBM proposed recently can overcome these defects，so the MRT-LBM is chosen to study various effect factors on the gas-solid reaction in porous media.The numerical results show that，as the Damkohler number (Da) or the molar volume ratio between CaCO3 and CaO is increased，the carbonation conversion of CaO will be reduced，while the radius of CaO grain is decreased，the carbonation conversion of CaO will be enhanced.These results are consistent with experimental results qualitatively.

Key words: porous media, lattice Boltzmann method, multi-relaxation-time, carbon dioxide

摘要： 近年来，利用CaO吸收烟气中的CO2越来越受到国内外研究者的关注。考虑到单松弛格子Boltzmann模型(LBGK模型)在模拟多孔介质内流动时存在的不足，采用了多松弛(MRT)格子Boltzmann方法来研究多孔CaO吸收CO2的过程，并分析了不同参数，如Damkohler数(Da)、摩尔体积比和CaO颗粒的粒径对CaO转化率的影响。研究结果表明：当Da越大或者摩尔体积比越大时，CaO的转化率会越来越低；另外，如果CaO颗粒的粒径越大，其转化率也将会越低。这些结论定性上与实验结果是吻合的。

关键词: 多孔介质, 格子Boltzmann方法, 多松弛模型, 二氧化碳