离心式与旋涡式压缩机驱动的MVR系统运行效果比较

Operation efficiency comparison of MVR systems driven by centrifugal and vortex compressor

从理论上分析植物提取液浓缩用MVR系统的运行原理,并比较不同类型压缩机的特点。结合实例,对比离心式与旋涡式压缩机驱动的MVR系统的运行效果。通过统计方法计算运行半年内,两套系统累计的蒸发量与用电量。结果发现:在相同设计蒸发量下,离心式压缩机平均蒸发量为2 545.3kg/h,最大能效比(COP)为15.3,单位蒸发量电耗为0.040kW·h/kg;旋涡式压缩机平均蒸发量为1 908.3kg/h,最大COP为11.0,单位蒸发量电耗为0.058kW·h/kg。证明在保证气密性的前提下,离心式压缩机比旋涡式压缩机更适用于含乙醇植物提取液的浓缩,节能效果更佳。

Theoretically analyzes the operating principle of MVR system for plant extract concentration, and compares the characteristics of different types of compressors. Combined with an example, the operation efficiencies of two MVR systems driven by centrifugal and vortex compressor are researched. The total amount of evaporation and electricity consumption between the two systems are calculated through a statistical method in a half year running time. The results show that under the same design evaporation rate, the average a- mount of evaporation rate is 2 545. 3 kg/h for centrifugal compressor, which is 1 908.3 kg/h for vortex compressor. The largest coefficient of performance （COP） is 15.3 for centrifugal compressor and 11.0 for vortex compressor. The specific electricity con-sumptions for evaporating are 0.040 kW . h/kg and 0.058 kW . h/kg for the two types of compressors. It can be proved that under the premise of ensuring air tightness, the centrifugal compressor is more suitable for concentrating alcohol distilled plant extract than the vor- tex compressor, and has a better energy saving effect in concentr- ation process.