低冷量下强化CO_(2)吸收的甲醇基纳米流体性能

Performance of methanol-based nanofluids with enhanced CO_(2) absorption under low cooling demand

冷甲醇洗法捕集CO_(2)技术要求低温环境,需要大量的冷冻能量,能耗较大。在吸收剂中引入纳米颗粒,可以有效提高气液传质速率,降低能耗。本研究旨在开发冷量需求少,吸收、解吸性能提升的甲醇基纳米流体。实验分别考察了纳米颗粒种类、固含量、尺寸,表面活性剂含量、操作温度和初始CO_(2)浓度等因素对吸收剂捕集CO_(2)性能的影响及机理。结果表明,在0.2~1.0g/L的TiO_(2)、Al_(2)O_(3)、SiO_(2)纳米流体中,0.4g/L的TiO_(2)-甲醇纳米流体的CO_(2)吸收、解吸增强效果最佳。向其中添加0.10%(质量分数)聚乙二醇辛基苯基醚(Triton X-100)后,纳米流体的吸收、解吸增强效果达到最大,且在5次循环后仍呈现良好增强效果。此外,本文对纳米流体增强吸收的机理进行了深入分析,提出了一个经验公式来预测TiO_(2)-甲醇纳米流体的增强因子E和最佳固含量。

The rectisol process for capturing CO_(2) requires low-temperature environment,a significant amount of freezing energy,and considerable energy consumption.Introducing nanoparticles into absorbents can effectively enhance the gas-liquid mass transfer rate and reduce energy consumption.This study aimed to develop methanol-based nanofluids with reduced cooling demand and improved absorption and desorption performance.The effects of factors such as the type of nanoparticles,solid loading,particle size,surfactant content,temperature,and initial CO_(2) concentration on CO_(2) capture performance were investigated,and the impact mechanisms were studied.The results indicated that the CO_(2) absorption and desorption enhancement effect of TiO_(2)-methanol nanofluid with a concentration of 0.4g/L was the best among TiO_(2),Al_(2)O_(3) and SiO_(2) nanofluids with concentrations ranging from 0.2-1.0g/L.After adding 0.10% polyethylene glycol octylphenyl ether(Triton X-100),the absorption and desorption enhancement effect of the nanofluid were the highest,and it still showed a noteworthy enhancement effect after 5 cycles.Furthermore,this article provided an in-depth analysis of the mechanism of enhanced absorption of nanofluids and proposed an empirical formula to predict the enhancement factor E and optimal solid loading of TiO_(2)-methanol nanofluids.