【摘要】 微通道反应器能有效增强气液间传质,但处理能力受限。为了提高微通道的处理量,对微通道反应器的一维放大及气-液传质特性进行了研究。以乙醇胺(MEA)和甲基二乙醇胺(MDEA)混合水溶液吸收CO2为研究物系,在通道深度恒定时,考察了微通道宽度、气液流速对传质特性的影响。结果表明,传质系数和体积传质系数均随通道宽度先增大后缓慢减小,在通道宽度为1000μm时达到最大值。比表面积随通道宽度的增大而降低。因此,合理增大微通道宽度,可在提高处理能力的同时,仍然保持良好的传质特性。更多还原

【Abstract】 The microchannel reactor can effectively enhance the mass transfer between gas and liquid,but its processing capacity is limited.To increase the productivity of the microchannel,one-dimensional amplification and the gas-liquid mass transfer characteristics of the microchannel reactor were investigated.By using CO2 absorption into monoethanolamine(MEA) and methyldiethanolamine(MDEA) mixed aqueous solution as the working system,the effects of microchannel width and gas-liquid flow rate on mass transfer characteristics were studied under a constant channel depth.The results show that both the mass transfer coefficient and volumetric mass transfer coefficient increase firstly and then slightly decrease with increasing channel width,and the maximum values are attained in 400 μm × 1000 μm channel.The specific surface area decreases with the increase of channel width.Therefore,a reasonable increase in the width of the microchannel can improve the processing capacity while still maintaining good mass transfer characteristics.更多还原