高长径比气液固三相内环流反应器的流体动力学.pdf

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1、化学工程师Sum237No．06ChemicalEngineer2015年第o6期继缕释一煮DOI：10．162470．cnki．23—1171hq．20150621高长径比气液固三相内环流反应器的流体动力学王字(抚顺矿务局职工工学院。辽宁抚顺113008)摘要：在高径比为22的三相内环流反应器中，常温常压下，根据动量平衡原理建立了空气一水一石英砂三相物系的循环液速模型，并建立了上升区气含率、上升区固含率和底部换向区阻力系数模型；考察了在不同颗粒粒径下，表观气速对上升区固含率和液体循环速度的影响。结果表明：当粒径()≤0．3mm时，上升区固含率随表观气速的增加变

2、化呈平缓趋势，当0．3mm<≤l_2mm时，上升区固含率随表观气速的增加而呈先下降后增加的趋势；不同粒径下上升区循环液速均随表观气速的增加而增加；气含率、固含率和循环液速的计算值和实验值吻合较好，其平均相对误差分别为6．32％、4．56％和11．97％。关键词：内环流反应器；循环液速；阻力系数；气含率；固含率；动量平衡中图分类号：TQ052文献标志码：AHydrod~rnamicsongas—-liquid-solidthree-phaseinternal—-loopairliftreactorwithbigratioofheighttodiameterWANG

3、Yu(VocationalSchoolofFushumMiningBureau，Fushun113008，China)Abstract：Basedonthemomentumbalanceprincipletoestablishaliquidcirculationvelocitymodeloftheair—water—quartzsandthree-phaseonthree-phaseinternal-loopairliftreactorwsaesoabkusgedwiththebigratio(heighfinnerdiameter=22)ofheighttod

4、iameter,undernormaltemperatureandatmosphere，themodelofthegasholdupoffise~solidholdupoffise~frictionallosscoefficientofriserandfrictionallosscoefficientofthebottomofthereversingthebottomofthereversingofdragcoefficientwereobtainedbyusingcorrelationmethod；Atdifferentparticlesize，theefec

5、tsofsuperficialgasvelocityonsolidholdupinriserandliquidcirculationvelocitywereinves—tigatedforthesystem．Theresultsshowedthatthesolidholdupinrisergenrewiththeincreaseofthesuperficialofgasvelocityatsandsparticles≤0．3mmandincreaseafterthefirstdropwiththeincreaseofthesuperficialofgasvelo

6、cityatsandsparticles>0．3mmwhile≤i．2mm．Theliquidcirculationvelocityincreasedwiththeincreaseofthesuperficialgasvelocityatdiferentparticlesize．Gasholdup，solidholdupandliquidcirculationvelocityofthecal—culatedandexperimentalvaluesareinagreement，theaveragerelativeerrorsofgasholdup，solidho

7、ldupandliquidcirculationvelocitybetweencalculatedandexperimentalvalueswere6．32％．4．56％and11．97％．Keywords：internal—loopaidihreactor；liquidcirculationvelocity；frictionallosscoeficient；gasholdup；solidholdup；momentumbalance当前开发煤加氢液化反应器的一个热点是研地防止固定床层内的飞温，但不能解决高压操作所究采用内环流三相反应器。内环流反应器是一类高导致的

8、反应器外径大、器壁过厚、