Discussion of MVR technology for recovering waste heat from esterification steam in process tower of polyester plant
With the large-scale development of polyester plants,the utilization of waste heat resources from esterification steam in the process tower of a plant cannot be ignored.The utilization methods of esterification steam waste heat from the process tower of polyester plant include waste heat refrigeration,waste heat extraction,etc.,but there is a problem of low waste heat utilization rate.By analyzing the characteristics of esterification steam in the process tower of polyester plant and the existing waste heat uti-lization methods and consideing the development of new steam compressors,the technical scheme and advantages of mechanical vapor recompression(MVR)technology to recover waste heat from esterification steam in process tower were emphatically dis-cussed and compared with those of waste heat power generation technology.The results showed that the esterification steam in the process tower of polyester plant had the characteristics of low temperature,low pressure and low allowable pressure drop,singnifi-cant boiling point difference of components,great heat load difference in winter and summer and strong corrosiveness;for large-scale polyester plants,using MVR technology to convert excess waste heat resources into steam while considering the cooling/heating requirements of polyester plant can not only achieve the recovery of esterification steam waste heat,but also satisfy the working conditions of great heat load difference between esterification steam in winter and summer,so MVR technology was a more economical and efficient utilization method than waste heat power generation.
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