Rigorous modelling of NOx absorption in tray and packed columns
Rigorous modelling of NOx absorption in tray and packed columns
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DOI：
10.1016/j.ces.2005.04.060
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发表时间：
2005-11
影响因子：
4.7
通讯作者：
Bernhard Hüpen;E. Kenig
中科院分区：
文献类型：
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作者：
Bernhard Hüpen;E. Kenig
氮氧化物在纯水或硝酸中的吸收通常是一种动力学控制的操作，其中气相和液相中的复杂反应与多组分传质相结合。为了能够充分地描述该过程，已经基于早期的工作开发了用于塔盘和填充塔中的反应性吸收的严格的基于一般速率的模型（参见例如[Kenig等人，2001. Chemical Engineering Science 56，343-350; Kenig等人，2003.化学工程和技术6，631-646]）。考虑了膜相中的传热和多组分传质、化学反应和热力学非理想性。此外，塔内构件和水力学的影响被认为是通过相关的关联。对于板式塔，特别考虑塔板上气液层上方的空区。该模型在白杨Custom ModelerTM模拟环境中实现，并通过与中试规模填料塔和装有冷却盘管的工业筛板塔的实验数据比较进行验证。两种塔型的模拟结果与实验结果吻合较好。此外，冷却对过程行为的影响进行了研究。
The absorption of NOxinto pure water or nitric acid is usually a kinetically controlled operation in which complex reactions in both gas and liquid phases are combined with multicomponent mass transfer. To be able to describe this process adequately, a rigorous general rate-based model for the reactive absorption in tray and packed columns has been developed based on earlier works (see, e.g. [Kenig et al., 2001. Chemical Engineering Science 56, 343–350; Kenig et al., 2003. Chemical Engineering and Technology 6, 631–646]). Heat and multicomponent mass transfer in the film phases, chemical reactions and thermodynamic non-idealities are taken into account. Furthermore, the influence of column internals and hydraulics is considered via relevant correlations. For tray columns, a special consideration of the empty sections above the gas–liquid layer on a tray is included. The model is implemented into the simulation environment Aspen Custom ModelerTMand validated by comparison with experimental data for a pilot scale packed column and an industrial sieve tray column equipped with cooling coils. The simulation results obtained for both column types agree well with the experimental measurements. In addition, the influence of cooling on the process behaviour is studied.