卧式热虹吸再沸器的压力平衡计算

由传热设计软件HTRI7.0对石油化工装置中常用的卧式热虹吸再沸器的工艺设计过程进行详细介绍。文章主要研究了卧式热虹吸再沸器基于压力平衡下的再沸器安装高度的计算方法及步骤，得出了卧式热虹吸再沸器的阻力损失包括再沸器入口管线阻力损失、再沸器内的阻力损失和再沸器出口管线阻力损失三部分，其中，再沸器出口管线为两相流，其阻力损失计算采用分离模型计算的误差小，准确度高。根据上述工艺设计方法，以某甲醇制烯烃（MTO）装置中一台水汽提塔再沸器为例，分析了该再沸器开工时出口管线振动的原因是由于推动力过大导致两相流流型为不稳定流型从而引起操作不稳定，并给出合理的改造和解决方案，即在再沸器入口管线增加手动调节阀。

Pressure balance calculation for horizontal thermosyphon reboiler

A detailed design procedure for the horizontal thermosyphon reboiler using thermal rating software HTRI7.0 in petrochemical engineering plant is introduced. Which includes the calculation method of installation height between tower and reboiler. The total pressure drop of horizontal thermosyphon reboiler includes the inlet piping pressure drop, the heat exchanger pressure drop and the outlet piping pressure drop. The flow in outlet piping is two phase fluid and the pressure drop can be calculated using the separated flow mode. An example of water stripper reboiler in a MTO unit is also given to analyze the vibration problem during start-up case and a reasonable solution that adding a valve at inlet piping to change the two phase flow mode is provided finally.