填料塔中二液相并流蒸发过程的实验研究

Experimental study on liquid-liquid cocurrent evaporation in packed column

以异丁烷和水作为换热工质,对其在填料塔内直接接触蒸发换热过程进行了研究。2种工质都以液态形式从填料塔顶部进入,在填料表面并流换热,异丁烷吸热之后气化上升,最后从顶部离开填料塔。研究结果表明:在此蒸发换热过程中,二相液体间的对数平均温差及异丁烷气体的流量都对填料塔的体积换热系数有影响;体积换热系数与对数平均温差近似成负幂指数变化;异丁烷气体流量的增大则会使体积换热系数线性增大,而水流量的变化则对体积换热系数的影响不大。

Taking isobutene and water as heat transfer medium, an experimental study on their direct-contact evaporation inside a packed Column was carried out. Both isobutane and water in liquid state entered the packed column from the top of it and cocurrently heat-exchanged on the packing surface, and then isobutane was evaporated and left the packed column from the top of it. The results show that the logarithmic mean temperature difference and the flow rate of isobutane gas have great influence on the volume heat transfer coefficient of the packed column. The volume heat transfer coefficient has approximately a negative power exponent relationship with logarithmic mean temperature difference and a positive linear relationship with gas flow rate. However, the flow rate of water has little influence on the volume heat transfer coefficient.