热虹吸式再沸器的压力平衡设计

Pressure balance design for thermal siphon reboiler

热虹吸式再沸器是石油化工行业广泛使用的传热设备,是自然循环单元操作,动力来自与之相连的精馏塔塔釜液位产生的静压头和被加热流体的密度差,因此再沸器的设计不仅要满足其传热的需要,也要满足其系统流体力学压力平衡的需要。本文以TEMA标准、国家标准和石化标准为依据,提出一套完整的再沸器压力平衡计算方法及步骤。利用此计算方法,对某催化热裂解装置中未达到换热要求的脱丁烷塔再沸器进行压力平衡和传热核算,发现此台再沸器的安装高度不能满足目前装置运行的要求,这是造成气化率低的主要原因。根据核算结果和现场设备布置,提出相应的改造方案。最后本文提出热虹吸式再沸器压力平衡设计中的要点及注意事项,以满足再沸器运行中稳定性和多样性的要求。

Thermosyphon reboiler is natural circulation equipment,widely used in petroleum and chemical industry,which drived by density contrast between heated fluid and static head linked to column bottom.So the reboiler system design should simultaneously satisfy the needs of the heat transfer and fluid mechanics pressure equilibrium.According to TEMA standards,national standards and petrochemical standards,this paper propose a complete set of reboiler pressure balance calculation method.Using this method,check pressure balance for butane tower reboiler in catalytic cracking unit,which gasification is lower than design,found the reboiler of installation height can＇t meet the requirements of current plant operation.According to the calculation results and field equipment layout, puts forward the corresponding reform scheme.Finally,the paper puts forward the key points and announcements for heat siphon reboiler in the design of pressure balance in order to meet the requirements of stability and diversity in the operation of the reboiler.