催化剂浸渍干燥设备的计算流体力学模拟
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摘要
对用于非固定床的负载型催化剂而言,粒度分布、强度、球形度等质量指标对催化反应过程有重大影响。干燥在炼油催化剂生产中是关键处理工艺之一,对催化剂产品的粒度分布、强度和球形度等指标有重大影响。为了提高催化剂的质量,开发了一种浸渍干燥器。根据工艺要求,建立了一个浸渍干燥器三维几何模型,并应用欧拉-欧拉双流体模型,进行了两相计算流体力学(CFD)模拟计算。通过干燥器内流场和气固两相分布的信息,获得了较优的浸渍干燥器进料管长度,为催化剂浸渍干燥器的设计与放大提供可靠指导。
The quality indexes of catalyst,like particle size distribution,strength and sphericity,have a great influence on the catalytic process,especially for the supported catalysts used in non-fixed beds.Drying is one of the keys to the preparation of catalysts and greatly affects the quality index of catalysts.A coupling equipment of impregnating and drying was developed to improve the catalyst quality.Based on the demands of the process,a three dimensional model for the coupling equipment was established and the two-phase computational fluid dynamics(CFD)simulations were conducted with Euler-Euler model.According to the information of flow field and gas-solid two-phase distribution in the dryer,the optimal feeding tube length was obtained.It provides a reliable guidance for the design and scale-up impregnating and drying equipment of catalyst.
The quality indexes of catalyst,like particle size distribution,strength and sphericity,have a great influence on the catalytic process,especially for the supported catalysts used in non-fixed beds.Drying is one of the keys to the preparation of catalysts and greatly affects the quality index of catalysts.A coupling equipment of impregnating and drying was developed to improve the catalyst quality.Based on the demands of the process,a three dimensional model for the coupling equipment was established and the two-phase computational fluid dynamics(CFD)simulations were conducted with Euler-Euler model.According to the information of flow field and gas-solid two-phase distribution in the dryer,the optimal feeding tube length was obtained.It provides a reliable guidance for the design and scale-up impregnating and drying equipment of catalyst.
引文
[1] 刘新林,许友好,崔守业.催化剂粒径分布对催化裂化产物选择性的影响[J].石油炼制与化工,2011,42(2):42-46
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[3] 田志鸿,周健,吕庐峰,等.一种连续高温气固反应器:中国,200410086226.4 [P].2004-10-08
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[14] Lee S Y.Polyhedral mesh generation and a treatise on concave geometrical edges[J].Procedia Engineering,2015,12(4):174-186
[15] 朱振兴,王少兵,戴厚良.PX吸附分离技术核心内构件开发[J].石油学报(石油加工),2017,33(5):803-810
[2] 尹忠亮,周岩.干燥设备的进展及其在催化剂生产中的应用[J].山东化工,2003,32(4):34-36
[3] 田志鸿,周健,吕庐峰,等.一种连续高温气固反应器:中国,200410086226.4 [P].2004-10-08
[4] 周雪漪.计算水力学[M].北京:清华大学出版社,1995:4-5
[5] 陶文铨.数值传热学[M].2版.西安:西安交通大学出版社,2001:7-10
[6] 郭泓志.传输过程数值模拟[M].北京:冶金工业出版社,1998:21-25
[7] 戴干策,陈敏恒.化工流体力学[M].北京:化学工业出版社,2005:145-148
[8] Anderson T B,Jackson R.A fluid mechanical description of fluidized beds[J].I & EC Fundam,1967,6(4):527-534
[9] Batchelor G K.An Introduction to Fluid Dynamics[M].Cambridge:Cambridge Univ Press,1967:10-123
[10] 王福军.计算流体动力学分析——CFD软件原理与应用[M].北京:清华大学出版社,2007:120-123
[11] Haider A,Levenspiel O.Drag coefficient and terminal velocity of spherical and nonspherical particles[J].Powder Technology,1989,58:63-70
[12] Launder B E,Spalding D B.Lectures in Mathematical Models of Turbulence[M].London:Academic Press,1972:42-166
[13] 朱振兴.硫酸铵结晶过程的研究及其固-液多相流的计算流体力学研究[D].天津:天津大学,2008
[14] Lee S Y.Polyhedral mesh generation and a treatise on concave geometrical edges[J].Procedia Engineering,2015,12(4):174-186
[15] 朱振兴,王少兵,戴厚良.PX吸附分离技术核心内构件开发[J].石油学报(石油加工),2017,33(5):803-810