摘要变换工序是合成氨中最重要的工序之一，在合成氨工艺的流程中起着非常重要的作用本次设计为70kt/a合成氨变换工段的工艺设计。本设计采用全低变的工艺流程.。根据有关文献资料，完成物料、热量的计算。并对第一变换炉、第二变换炉、煤气换热器以及变换气换热器等主要设备进行选型计算。并做出了合成氨变换工段全低变的工艺流程图和设备布置图。所得结果基本满足设计要求，工艺流程可行。关键词：合成氨；低温变换；热量衡算；物料衡算.AbstractTransformprocessesisoneofthemostimportantprocesses,anditplaysaveryimportantroleintheindustryofsyntheticammonia.Thetaskisthedesignofshiftprocessin70kt/aNH3.Thelow-temperatureshifttechnologywasadoptedinthiscalculation.Accordingtotherelevantculturalheritagedata,completethecalculationofmaterial,calories.Furthermore,thesizeandtypeoftheequipmentsweredeterminedsuchasheatexchanger,shiftconverter,etc.Alsodotosynthesizeanalloftheammoniatransformationworksegmentlowcraftflowchartandequipmentschangingsetoutdiagram.Theresultsmeettherequirementsofthedesigntaskwell,thecraftprocesscango.摘要...........................................................................................................................................IAbstract..........................................................................................................................................II第一章前言..................................................................................................................................11.1变换气反应原理................................................................................................................11.2CO变换反应化学平衡......................................................................................................21.3CO低温变换催化剂..........................................................................................................51.3.1低变催化剂的发展..................................................................................................51.3.2低变催化剂的主要成分..........................................................................................51.3.3催化剂的活性降低和中毒......................................................................................71.4工艺流程简述....................................................................................................................8第二章物料衡算及热量衡算...................................................................................................102.1设计条件...........................................................................................................................102.2CO全变换过程总蒸汽比的计算....................................................................................102.3第一变换炉催化剂床层物料与热量衡算.......................................................................112.3.1入第一变换炉催化剂床层汽气比........................................................................112.3.2CO平衡变换率及出催化剂床层气体的组成......................................................122.3.3第一变炉热量衡算................................................................................................132.3.4第一变换炉催化剂层CO变换反应平衡曲线.....................................................142.3.5CO在第一变换炉催化剂床层最适宜温度..........................................................152.3.6CO在第一变换炉催化剂层变换反应操作...
