26 第26 课 蒸馏设备之蒸馏塔.pptx

DistillationTowerTeacher：XuFengLiuGangDongPolytechnicDistillationTowerDistillationtowerisusedforcontinuousdistillationtoproducenearlypureproductsatboththetopandbottomofthedistillationtower.Thefeedisadmittedtoaplateinthecentralportionofthetower.Ifthefeedisliquid,itflowsdownthetowertothereboilerandisstrippedofcomponentAbythevaporrisingfromthereboiler.Bythismeansabottomproductcanbeproducedwhichisnearlypure.蒸馏塔蒸馏塔用于连续生产，在蒸馏塔的顶部和底部生产接近纯净的产品。进料在蒸馏塔的中间塔板进行。如果进料是液体，它就会顺着塔向下流到再沸器，由再沸器上升的蒸汽除去A组分。通过这种方法，可以生产出几乎纯净的塔底产品。DistillationTowerAdistillationtowerequippedwiththenecessaryauxiliariesandcontainingrectifyingandstrippingsectionsisshowninFigure18-2.TowerAisfednearitscenterwithasteadyflowoffeedofdefiniteconcentration.Assumethatthefeedisaliquidatitsboilingpoint.蒸馏塔如图18-2所示，蒸馏塔需要配备必要的辅助设备，包括精馏段和提馏段。塔A要在其的中间以一定浓度的稳流体进料。假设进料是处于沸点的液体。DistillationTowerTheplateonwhichthefeedentersiscalledthefeedplate.Allplatesabovethefeedplateconstitutetherectifyingsection,allplatesbelowthefeed,includingthefeedplateitself,constitutethestrippingsection.Thefeedflowsdownthestrippingsectiontothebottomofthetower,inwhichadefinitelevelofliquidismaintained.蒸馏塔进料进入的踏板叫进料板。进料板以上的所有塔板构成了精馏段，进料板以下的所有塔板，包括进料板本身，构成提馏段。进料沿着提馏段向下流至塔底，在塔底保持一定的液位。DistillationTowerLiquidflowsbygravitytoreboilerB,Thisisasteam-heatedvaporizerthatgeneratesvaporandreturnsittothebottomofthetower.Thevaporpassesuptheentiretower.Atoneendofthereboilerisaweir.ThebottomproductiswithdrawnfromthepoolofliquidonthedownstreamsideoftheweirandflowsthroughthecoolerG.Thiscooleralsopreheatedthefeedbyheatexchangewiththehotbottoms.蒸馏塔液体在重力作用下流到再沸器B，再沸器B是一个蒸汽加热的蒸发器，它产生蒸汽并将其返回到塔的底部。蒸汽沿塔向上流运动。再沸器的一端有一个回流堰。从回流堰下面一侧的蓄液池可以获得塔底产品，塔底产品流入塔底冷凝器g。通过与塔底进行热交换对进料进行预热。DistillationTowerThevaporsrisingthroughth