U形管式流化床中下行段颗粒流动特性研究

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中图分类号：TQ522.5 文献标识码：A DOI：10.7535/hbkd.2025yx06005

Abstract：Toaddressevere pipelinecloggingandwaste waterisuescausedbytarcondensationduringthecolingofrawcoal pyrolysisgas，directcatalyticcrackingofthehotrawgasfromcoalpyrolyzerwasproposedinthisstudytoconvertthepolycyclic compoundsintarintolow-boiling-pointmonocycliccompounds.Furthmore，aU-bendtubularfluidizedbedwasintroducedasthe crackingreactor.Toanalyzethepartile-flowdynamicsinthisreactor，acold-flowmodelexperimentalsetupwasdesignedand constructed.Axialpressureproflesinboththedownersectionandrisersectionsweremeasuredunderrelativelylowbeddensities.The efectsofsolidfuxandsuperfialgasvelocityoeaialanddialdistributisofolidoncentration（theatioftetotalolue of particlestothevolumeofthereactor）andparticlevelocityinthedownersectionwerealsoinvestigated.Theexperimentalresults indicatetattheaxialpresureinthedownersectionincreasesgraduallyfromtotoottom，hiletheoppositetrendoursiteiser section.Inthedownersection，theaxialsolidconcentrationfirstrisesandthenplateaus，exceedingthatinasingledowerunder equivalentconditions.Theaialparticlevelocitydecreasesintediretionofflow.Radially，thesolidconcentrationexhitsa“dense annular”structure，andtheparticlevelocitydeclinesnearthewall.Thisstudyofersfundamentalinsightintotheparticle hydrodynamicsoftheU-bendtubularfluidizedbed，providingreferenceforsubsequentexperimentalresearchandreactorscaleup.

Keywords：multiphase flow reaction engineering；rawgas；fluidized bed；pressre；solid concentration；particle velocity

低阶粉煤分质利用是指通过热解将低阶粉煤转化为焦炭或半焦，同时，将释放的高温荒煤气经冷却和冷凝分离得到焦炉煤气和煤焦油 [1-2] ，最终所有产物均可分别进行高效利用。（剩余11169字）