填料萃取塔塔高的设计计算

从填料萃取塔设计的信息流图出发,介绍了影响填料萃取塔传质性能诸参数 的计算方法,论述了按基本原理进行填料萃取塔塔高计算的方法,并给出了计算实例。     

糠醛精制转盘塔技术改造的若干建议

本文介绍了糠醛精制转盘萃取塔的现状,分析了其用于糠醛萃取的不足;介绍了新型填料萃取塔的研究和应用的若干进展,提出了用QH-1型填料作新型填料萃取塔的意见及糠醛精制转盘塔技术改造的若干建议。     

脉冲筛板柱用于醋酸回收的研究

在内径40mm的实验柱中,用30％TBP(煤油)-醋酸-水体系研究了脉冲筛板柱的稳定操作范围和传质特性。按扩散模型的近似解法处理实验数据,讨论了表观传质单元高度H_(OXP)、真实传质单元高度H_(OX)、分散单元高度H_(OXD)和体积传质系数K_(OX)a随脉冲强度fA变化的规律。结合低浓醋酸废水的回收问题,讨论了脉冲筛板柱的优化操作条件。     

内弯弧形筋片扁环填料的研究和应用

内弯弧形筋片扁环填料(QH—1型)是清华大学研究开发的新型填料。它的特点是流道结构合理,阻力降小,处理能力大,传质效率高,设计弹性大,适用范围广。     

重质润滑油精制塔改造获得成功

本文介绍了锦西炼油厂与清华大学合作对酚精制装置填料萃取塔进行技术改造的情况及其改造的效果。自1987年4月以来,锦州石化公司锦西炼油厂与清华大学化工系合作,对以加工重质润滑油为主的酚精制第二套装置(酚二装置)的填料萃取塔进行了技术改造,取得了明显的效果。     

涡流桨搅拌槽内流动非稳定性的大涡模拟

The aim of this work is to investigate the flow instabilities in a baffled, stirred tank generated by a single Rushton turbine by means of large eddy simulation （LES）. The sliding mesh method was used for the coupling between the rotating and the stationary frame of references. The calculations were carried out on the ＂Shengcao-21C＂ supercomputer using a computational fluid dynamics （CFD） code CFX5. The flow fields predicted by the LES simulation and the simulation using standard κ-ε model were compared to the results from particle image velocimetry （PIV） measurements. It is shown that the CFD simulations using the LES approach and the standard κ-ε model agree well with the PIV measurements. Fluctuations of the radial and axial velocity are predicted at different frequencies by the LES simulation. Velocity fluctuations of high frequencies are seen in the impeller region, while low frequencies velocity fluctuations are observed in the bulk flow. A low frequency velocity fluctuation with a nondimensional frequency of 0.027Hz is predicted by the LES simulation, which agrees with experimental investigations in the literature. Flow circulation patterns predicted by the LES simulation are asymmetric, stochastic and complex, spanning a large portion of the tanks and varying with time, while circulation patterns calculated by the simulation using the standard κ-ε model are symmetric. The results of the present work give better understanding to the flow instabilities in the mechanically agitated tank. However, further analysis of the LES calculated velocity series by means of fast Fourier transform （FFT） and/or spectra analysis are recommended in future work in order to gain more knowledge of the complicated flow phenomena.     

硼酸盐活化效应对碳酸钾溶液吸收CO_2的影响

活化碳酸钾溶液吸收法是实现燃煤电厂烟气中CO2大规模捕集的颇具潜力的减排技术之一。文中采用停流光谱–pH指示剂技术和气液接触式湿壁柱实验装置考察了硼酸盐对CO2水合的活化效应及其对碳酸钾溶液吸收CO2的影响。研究结果表明:硼酸盐可以活化CO2转化为HCO3?,其活化机制类似于碳酸酐酶催化CO2水合机制;在碳酸钾溶液中加入硼酸盐可以明显提高CO2在溶液中的富集速率和吸收过程的增强因子。考虑离子强度的影响,在液膜控制条件下,文中建立的基于液相硼活化机制的模型可以很好的预测硼酸盐活化的碳酸钾法对CO2的实际吸收效果,为工艺过程设计和操作条件优化提供借鉴参考。