The waste heat utilization in the coal-fired plant has always been one of important ways of the energy saving. In this paper, a novel device is constructed by the combination of the ceramic membrane desorption and the flue gas waste heat utilization. In the device, the absorption solution is the “double-cationic” ionic liquid ([TEPA][1-MIm]). Furthermore, experimental results show that the contact angle of the hydrophobic ceramic membrane is 130°. Under ambient temperature conditions, it is observed that at a concentration of 25 % [TEPA][1-MIm] in an ethylene glycol solution, the maximum absorption amount of CO₂ reaches approximately 1.605 mol CO₂/mol amine. The saturation time of the absorption is about 20 min. As the concentration of ionic liquids increases, the saturation time gradually extends due to an increase in [TEPA][1-MIm] and consequently higher total CO₂ absorption mass. Subsequently, effects of the operating parameters on the desorption rates are analyzed. The contribution of this work is to put forward the idea of utilizing ceramic membranes to recover the waste heat from the flue gas to reduce the CO₂ desorption energy consumption. According to experiments, the overall heat transfer coefficient can reach 20.33 W/(m²·K), and the amount of the recovered waste heat can reach 29.97 W.

中文翻译：

---

基于陶瓷膜的富CO2液体解吸实验研究


燃煤电厂的余热利用一直是节能的重要途径之一。本文将陶瓷膜脱附与烟气余热利用相结合，构建了一种新型装置。在该装置中，吸收溶液是“双阳离子”离子液体 （[TEPA][1-MIm]）。此外，实验结果表明，疏水性陶瓷膜的接触角为 130°。在环境温度条件下，观察到乙二醇溶液中浓度为 25 % [TEPA][1-MIm] 时，CO₂ 的最大吸收量达到约 1.605 mol CO₂/mol 胺。吸收的饱和时间约为 20 分钟。随着离子液体浓度的增加，由于 [TEPA][1-MIm] 的增加，饱和时间逐渐延长，因此 CO₂ 总吸收质量增加。随后，分析了操作参数对解吸速率的影响。这项工作的贡献是提出了利用陶瓷膜从烟气中回收余热以降低 CO₂ 解吸能耗的想法。根据实验，整体传热系数可达 20.33 W/（m²·K），回收的余热量可达 29.97 W。