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设计的MVR耙式干燥系统采用罗茨蒸汽压缩机替换耙式干燥系统中的真空泵,将干燥过程脱出的二次蒸汽压缩以提高压力和温度后作为热源使用。节省了大量热能,节能效果显著。该系统干燥物料可以是粉粒状、膏状、浆状,也可以是溶液(此时包含蒸发、结晶和干燥过程)。为了探索MVR耙式干燥系统干燥溶液的规律,首先以水为对象进行了实验研究。结果表明,适当减小压缩比、控制过热度、降低干燥压力均有利于提高系统的运行效率。在实验范围内,MVR耙式干燥系统的能效比(COP)为4.4~8.8,单位能耗除湿量(SMER)为2.0~3.4 kg/k Wh。按照目前的蒸汽电价比及能源状况,该工艺在干燥中仍有很大的应用前景。
The designed MVR Rake Drying System uses a Roots Vapor Compressor to replace the vacuum pump in the Rake Drying System. The secondary steam, which has been removed from the drying process, is compressed to increase pressure and temperature and used as a heat source. Save a lot of heat, energy-saving effect is significant. The dry material of the system can be in the form of powder, paste, paste, or solution (in this case evaporation, crystallization and drying processes). In order to explore the regularity of dry solution of MVR rake drying system, experimental research was first conducted on water. The results show that proper reduction of compression ratio, control of superheat and reduction of drying pressure all contribute to the improvement of system operation efficiency. Within the experimental range, the energy efficiency ratio (COP) of the MVR rake drying system was 4.4 to 8.8 and the SMER was 2.0 to 3.4 kg / k Wh. According to the current steam price ratio and energy status, the process is still a great prospect in the dry.