A multicomponent droplet model in simulating mass transfer of the ammonia-based spray process

被引：0
|
作者：
Li, Liqing [1 ]
Zhang, Chun [1 ]
Huang, Guijie [1 ]
Liu, Zheng [1 ]
Ma, Weiwu [1 ]
机构：
[1] School of Energy Science and Engineering, Central South University, Hunan Province, Changsha,Hunan Province,410083, China
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2014年 / 34卷 / 32期
关键词：
A mass-heat transfer and instantaneous chemical reaction model was built and analyzed by incorporating dual-film theory; Henry's law and various appropriate empirical and semi-empirical correlations of mass-heat transfer into the computational fluid dynamics (CFD) software package through User Defined Functions. Trajectories were calculated by discrete particle model (DPM); the flow pattern of flue gases was described by the local averaged Navier-Stokes equation closed via the RNG k-Ε model. PISO algorithm was adopted to calculate the pressure-velocity coupled unsteady flow. The experimental results are in good agreement with the calculation with relative error of around 10%; which proves the rationality of the mathematical model. Results show that the desulfurization efficiency (η) decreases with the increase of the slurry temperature and the initial concentration of SO2; or with the decrease of liquid-gas ratio. Since NH4HSO3 decomposes at around 50℃; η decreases significantly from 91% to 80% as the slurry temperature varied from 40 to 50℃. η is improved from 65% to 93% with the increase of liquid-gas ratio from 0.5 to 1.8 L/m3. With the increase of initial SO2 concentration from 1208 to 4832 mg/m3; the heterogeneous of distribution of SO2 concentration increases. The distribution of absorbent and species can be directly displayed by the mass-transfer model; which offers instructions for operation and optimization. © 2014 Chin. Soc. for Elec. Eng;
D O I：
10.13334/j.0258-8013.pcsee.2014.32.007
中图分类号：
学科分类号：
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页码：5741 / 5749
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