气固两相流强化传热研究进展

在气流中加入颗粒,形成气固两相流。根据气流速度的不同,气固两相流分为鼓泡流态化、快速流态化、气力输送等形式。不同的流动形态,两相流内颗粒浓度及颗粒的运动规律不同,其传热特点也存在差异。通过回顾几种多相流流态的传热特点,总结了多相流与传热面换热的影响因素、气固两相流的传热机理与模型。气固两相流中颗粒浓度、颗粒运动对其传热起决定性作用,而操作参数(气流速度、床层压力、床层温度等)则主要通过改变颗粒浓度和颗粒运动影响传热。此外,通过气固两相流强化传热的应用实例——气固两相流与填充床的热交换,分析了颗粒在对流换热中所起的作用,并进一步提出了今后研究方向和难点所在。

Methanol Distillation System: Process Analysis and Column Design

Base on industrial research and experience, the process of methanol distillation is analyzed,and above all, a new concept of high pressure flowsheet and low pressure flowsheet is defined. The new configuration helps to handle problems encountered in many factories in China. The inter influence between process and column internal pattern is also pointed out. Recommendation of new column internal designs is given. Finally, industrial examples tell the how the new concept works and the possibility of combining process to give more opens to solve engineering problems.