Modelling and simulation of intensified absorber for post-combustion CO2 capture using different mass transfer correlations
Modelling and simulation of intensified absorber for post-combustion CO2 capture using different mass transfer correlations
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DOI：
10.1016/j.applthermaleng.2014.02.064
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发表时间：
2015-01
影响因子：
6.4
通讯作者：
A. Joel;Meihong Wang;C. Ramshaw
中科院分区：
文献类型：
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作者：
A. Joel;Meihong Wang;C. Ramshaw
本文研究了旋转填料床（RPB）中的传质过程，该过程具有显著降低燃烧后CO2捕集的投资和运行成本的潜力。为了模拟强化吸收器，在可视化FORTRAN中实现传质关联，然后与基于速率的白杨Plus®模型动态链接。因此，这是一个新开发的模型，强化吸收器使用RPB。两套传质关联式进行了研究和比较，通过模型验证。与第一组相关性相比，第二组相关性在测试的MEA浓度下表现更好。为深入了解强化吸收塔的设计和操作，进行了过程分析，结果表明：（a）在固定RPB设备尺寸和固定贫MEA流量的情况下，CO2捕集水平随烟气流量的增加而降低;（B）较高的贫MEA入口温度导致较高的CO2捕集水平。(c)在较高的烟气温度（从30 °C到80 °C）下，强化吸收塔的CO2捕集水平可以保持不变。与传统的填料塔吸收器相比，本研究得到的启示是：（1）旋转填料床（RPB）强化吸收器显著改善了传质。(2)由于较高的贫MEA温度和/或较高的烟道气温度对RPB的性能表现出很小的影响或没有影响，因此可以节省冷却负荷成本。
This paper studied mass transfer in rotating packed bed (RPB) which has the potential to significantly reduce capital and operating costs in post-combustion CO2capture. To model intensified absorber, mass transfer correlations were implemented in visual FORTRAN and then were dynamically linked with Aspen Plus®rate-based model. Therefore, this represents a newly developed model for intensified absorber using RPB. Two sets of mass transfer correlations were studied and compared through model validations. The second set of correlations performed better at the MEA concentrations tested as compared with the first set of correlations. For insights into the design and operation of intensified absorber, process analysis was carried out, which indicates: (a) With fixed RPB equipment size and fixed Lean MEA flow rate, CO2capture level decreases with increase in flue gas flow rate; (b) Higher lean MEA inlet temperature leads to higher CO2capture level. (c) At higher flue gas temperature (from 30 °C to 80 °C), the CO2capture level of the intensified absorber can be maintained. Compared with conventional absorber using packed columns, the insights obtained from this study are (1) Intensified absorber using rotating packed bed (RPB) improves mass transfer significantly. (2) Cooling duty cost can be saved since higher lean MEA temperature and/or higher flue gas temperature shows little or no effect on the performance of the RPB.