催化臭氧化三相环流反应器的CFD模拟
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摘要
采用欧拉法对环流反应器中气-液-固三相流动进行计算流体力学模拟研究,通过氧气-水-催化剂冷态实验体系的实验数据验证模型与参数。实验结果表明,反应器环隙区域液相环流的主要推动力为反应器中心气流上升造成的套管内外压力差。从操作条件优化和反应器设计角度,提出提高环隙区域气含率的两种方法——增大环隙套管内外压力差和降低气泡直径。结合实验工况探索了不同气流量下反应器内流体流动状态,为优化热态反应器操作提供理论依据。
Computational fluid dynamics(CFD) simulation was conducted to study hydrodynamic behaviors of gas-liquid-solid flow in a loop reactor by Euler method. Models and parameters were validated by the experimental data of oxygen-water-catalyst cold experimental system. It was showed that the liquid circulation in the annulus zone of the reactor was mainly driven by the difference of the pressure inside and outside the sleeve,which was caused by the gas upflow in the core zone. From reactor design and operation optimization,two methods were put forward to improve gas holdup of annular zone,which were increasing difference of annular sleeve interior pressure and exterior pressure and decreasing the bubble diameter. Furthermore,gas flow conditions with different gas flow were explored combining with the experiment to provide theoretical basis for optimizing the operation of thermal reactor.
Computational fluid dynamics(CFD) simulation was conducted to study hydrodynamic behaviors of gas-liquid-solid flow in a loop reactor by Euler method. Models and parameters were validated by the experimental data of oxygen-water-catalyst cold experimental system. It was showed that the liquid circulation in the annulus zone of the reactor was mainly driven by the difference of the pressure inside and outside the sleeve,which was caused by the gas upflow in the core zone. From reactor design and operation optimization,two methods were put forward to improve gas holdup of annular zone,which were increasing difference of annular sleeve interior pressure and exterior pressure and decreasing the bubble diameter. Furthermore,gas flow conditions with different gas flow were explored combining with the experiment to provide theoretical basis for optimizing the operation of thermal reactor.
引文
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[2]刘辉.多相环流生物反应器内流动及发酵过程的实验与理论研究[D].天津:天津大学,1996.
[3]张艳艳.三相流化床臭氧催化氧化处理BTEX废水[D].长春:吉林大学,2011.
[4]Wen Jianping,Huang Lin,Xu Songlin,et al.Local bubble diameter profiles of gas-liquid self-aspirated reversed flow jet loop reactor[J].J Chem Ind Eng-Chin,2000,51(2):287-289.
[5]Wen Jianping,Jia Xiaoqiang,Feng Wei.Hydrodynamic and mass transfer of gas-liquid-solid three-phase internal loop airlift reactors with nanometer solid particles[J].Chem Eng Technol,2005,28(1):53-60.
[6]贾晓强,闻建平,程显瑞,等.气升式三相内环流生物反应器内流体力学和传质性能的实验研究[J].过程工程学报,2004,4(z1):604-610.
[7]蔡龙.气升式内环流生物反应器动力学参数研究[D].大连:大连理工大学,2002.
[8]丁其琛.计算流体力学模拟在生物反应器放大中的应用[D].北京:北京化工大学,2014.
[9]蒋雪冬.基于费托合成的气-液及气-液-固鼓泡塔流体力学特性分析[D].西安:西安交通大学,2015.
[10]魏骎.臭氧化/催化臭氧化深度处理脱墨废水的研究[D].北京:北京交通大学,2016.
[11]王雪.气升式三相环流生物反应器脱臭性能和优化模拟[D].天津:天津大学,2010.
[12]Grevskott S,Sann?s B H,Dudukov?M P,et al.Liquid circulation,bubble size distributions,and solids movement in two-and three-phase bubble columns[J].Chem Eng Sci,1996,51(10):1703-1713.
[13]Troshko A A,Zdravistch F.CFD modeling of slurry bubble column reactors for Fisher-Tropsch synthesis[J].Chem Eng Sci,2009,64(5):892-903.
[14]Wei Feng,Wen Jianping,Fan Jinghua,et al.Local hydrodynamics of gas-liquid-nanoparticles three-phase fluidization[J].Chem Eng Sci,2005,60(24):6887-6898.
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