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Aerosol growth in CO2 absorption with MEA, modelling and comparison with experimental results
International Journal of Greenhouse Gas Control ( IF 3.9 ) Pub Date : 2021-06-30 , DOI: 10.1016/j.ijggc.2021.103390
H.F. Svendsen , H. Majeed , H.K. Knuutila , M. Hillestad , S. Evjen , T. Mejdell , A. Einbu , K.W. Hjarbo , G. Haugen , K.A. Hoff

A new and improved aerosol model has been developed and tested against experimental data. An e-NRTL equilibrium model for MEA was extended to cover sulphuric acid containing droplets and validated against new eboulliometer data in this work.

The droplet model predicts emissions without demister installed in the absorber, within ± 20% and with demister, 30-80% of the measured emissions. The model predicts well the change in emissions from NG-based to coal-based exhaust.

Under conditions reported in this work, the droplet number concentration was found to have a small effect on predicted emissions because of more MEA gas-phase depletion with high droplet concentrations and slower growth. The effects counteract each other. With significant MEA depletion in the gas phase, the emissions are largely determined by the mass transfer rate from the bulk liquid.

The initial droplet sulphuric acid concentration had a minor effect on the outlet droplet size distribution. The effect on MEA emissions was significant: the emissions went up with increased initial sulphuric acid concentration. The effect of sulphuric acid was stronger for low inlet gas CO2 concentration (NG) than for coal-based exhaust. The increase in emissions is believed to be caused by the increase in overall driving force for MEA between bulk liquid phase and droplets.

The log-normal model does not catch small inlet droplet sizes in the range below 20-30nm. These droplet sizes hardly grow in the absorber and water wash and in the total emissions, these droplets have a negligible impact on emissions.



中文翻译:

使用 MEA对 CO 2吸收的气溶胶增长、建模以及与实验结果的比较

已经开发了一种新的和改进的气溶胶模型,并根据实验数据进行了测试。MEA 的 e-NRTL 平衡模型被扩展到包含硫酸的液滴,并在这项工作中针对新的沸点计数据进行了验证。

液滴模型预测在吸收器中没有安装除雾器的情况下的排放量在 ± 20% 以内,而在安装除雾器时,则为测量排放量的 30-80%。该模型很好地预测了从以天然气为基础的废气到以煤为基础的废气的排放变化。

在这项工作报告的条件下,发现液滴数量浓度对预测排放量的影响很小,因为高液滴浓度和较慢的生长会导致更多的 MEA 气相消耗。效果相互抵消。随着气相中 MEA 的显着消耗,排放在很大程度上取决于大量液体的传质速率。

初始液滴硫酸浓度对出口液滴尺寸分布的影响很小。对MEA排放的影响是显着的:排放随着初始硫酸浓度的增加而增加。硫酸对低入口气体 CO 2浓度 (NG)的影响强于煤基废气。排放量的增加被认为是由体液相和液滴之间 MEA 的整体驱动力增加引起的。

对数正态模型无法捕获低于 20-30nm 范围内的小入口液滴尺寸。这些液滴尺寸在吸收器和水洗中几乎不增加,在总排放量中,这些液滴对排放量的影响可以忽略不计。

更新日期:2021-07-01
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