CAJ | 학술논문

为了研究低表面张力物系在高比表面积的规整填料塔中的流体力学性能和传质性能，选用正庚烷-甲基环己烷物系，在内径400mm的不锈钢精馏塔中对Mellapak 500Y和750Y型规整填料进行全回流精馏实验。通过测定气相负荷从小到大直至液泛的过程，得到了不同操作条件下的压降、泛点气速、传质效率的数据，给定了操作的极限。结果表明：750Y填料的传质效率优于500Y填料，但稳定性比500Y填料差，处理量比500Y填料小。且实验中气相负荷递增变化时的传质效率略低于气相负荷递减变化时的传质效率。同时，为了考察传质效率随塔高的变化，填料塔在不同高度处设置了4个取样口，测定了不同取样口中样品的组成。通过分析传质效率随塔高的变化，阐述了不同负荷范围内气相总体积传质系数沿塔高的变化规律。
위료연구저표면장력물계재고비표면적적규정전료탑중적류체역학성능화전질성능，선용정경완-갑기배기완물계，재내경400mm적불수강정류탑중대Mellapak 500Y화750Y형규정전료진행전회류정류실험。통과측정기상부하종소도대직지액범적과정，득도료불동조작조건하적압강、범점기속、전질효솔적수거，급정료조작적겁한。결과표명：750Y전료적전질효솔우우500Y전료，단은정성비500Y전료차，처리량비500Y전료소。차실험중기상부하체증변화시적전질효솔략저우기상부하체감변화시적전질효솔。동시，위료고찰전질효솔수탑고적변화，전료탑재불동고도처설치료4개취양구，측정료불동취양구중양품적조성。통과분석전질효솔수탑고적변화，천술료불동부하범위내기상총체적전질계수연탑고적변화규률。
To investigate the hydrodynamics and mass transfer performance of low surface tension system in a column with structured packings,distillation experiments were carried out at total reflux usingn-heptane/methylcyclohexane system in a stainless steel distillation column containing Mellapak 500Y and 750Y. The inner diameter of the column was 400mm. Experiments were conducted in a wide range of flow rate. The flooding experiment data,which could give the limits of operation,was determined. The key parameters,including pressure drop,flooding factor,and mass transfer efficiency, were obtained. Compared with 500Y,750Y exhibited higher mass transfer efficiency,lower stability and smaller capacity. If experiments conducted with vapor load in ascending order,mass transfer efficiency was slightly lower than that measured by descending order. In order to study the variation of mass transfer efficiency along the tower,four sampling outlets were set up at different heights. The compositions of samples were determined. Through the analysis of mass transfer efficiency along the column,the relationship between overall gas phase volume mass transfer coefficient and tower height was determined at various vapor loads.