旋风分离器短路流的估算问题及其数值计算方法的讨论  

Discuss on estimation difficulties and numerical computation methods for short circuit flow in cyclone separators

作　　者：付烜[1] 孙国刚[1] 刘佳[1] 时铭显[1] 

机构地区：[1]中国石油大学(北京)化学工程学院,北京102249

出　　处：《化工学报》2011年第9期2535-2540,共6页CIESC Journal

基　　金：中石化沉降器防结焦项目(305013)~~

摘　　要：旋风分离器升气管下口短路流量的大小是评价分离器性能的指标之一,现有的短路流计算方法对升气管下口短路流出现的高度范围的选取并不明确,采用不同的高度范围计算结果可能完全不同,故而分离器设计、开发及应用前后往往需要经历反复的实验验证过程,既费时又费力。通过对双进口及普通单进口分离器径向速度场和轴向速度场的分析,自定义了一种基于数值计算平台的短路流计算方法,要点为根据分离器升气管下口位置横截面上径向流动向心与离心趋势的拐点划分短路流量计算的范围,基本为与升气管同心的环状面,利用CFD软件可以很容易地计算出此环面内下行的流量,即通常意义的短路流量。该计算方法的优势在于能够较准确地定义短路流计算的范围,并且对于新型多进口分离器和普通单进口分离器都适用,计算过程简单、结果可靠。The short circuit flow at the bottom of the vortex finder is an important factor for evaluating the performance of cyclone separators,but it is difficult to determine the altitude range of the short circuit flow.General measuring method is not available and the calculation results are quite different with various computation methods.Thus,to design a new separator many experiments are usually needed,which is time consuming and always costs too much.Here a computation method of short circuit flow based on CFD software is proposed.With the inflection point of the centripetal and centrifugal flow on the cross-section of the position at the bottom of the vortex finder,appropriate range for computing short circuit flow can be determined.The shape of the range is approximately annular and the descending flow rate across this range may be regarded as the total short circuit flow value.The calculation process is easily completed through the simulation result and the computation for short circuit flow is reliable.This method can be applied to multi-inlet and single-inlet separators.

关 键 词：旋风分离器 短路流 估算问题 数值计算 双进口分离器 

分 类 号：TQ021.1[化学工程]