复合抛物面聚光的直热蒸发脱盐系统研究

STUDY ON DIRECT HEATING DESALINATION SYSTEM WITH COMPOSITE PARABOLIC CONCENTRATOR

为实现沸腾汽化并减少装置内部结垢,该文设计出一种CPC聚光的直热蒸发脱盐系统。原水在蒸馏器内部通过换热盘管与CPC加热后的导热油直接换热并快速汽化,蒸汽冷凝收集得到淡水。研究发现:在夏季晴朗天气,系统蒸馏器进口油温最高为118.1℃,蒸馏室温度于11:00达到94.8℃,高于当地沸点,并持续到16:30;系统瞬时集热效最高为51%,日产淡水总量为7.23 kg且硬度始终低于饮用水标准;系统有效能利用率在12:00—16:30均保持0.5以上,最高为0.63。

In order to achieve boiling distillation and to reduce the internal fouling,this paper design a direct heating desalination system with compound Parabolic concentrator(CPC). CPC is employed to heat conduction oil in the system. The salt water is effectively heated and rapidly vaporized by working fluid in the heat exchanger,after that,steam condenses into fresh water in the condenser. The maximum oil temperature at the inlet of the distiller reaches 118.1 ℃ in sunny summer weather. The internal temperature of the distiller reaches 94.8 ℃ at 11:00 am,which is higher than the local boiling point and can last until 16:30. The instantaneous heat collection efficiency of the desalination system is 51%,the water yield under the total effective solar collection area is 7.23 kg/d,the TDS of the produced water undulates but always keeps blow drinking water standards. The effective energy utilization of the desalination system is beyond 0.5 from 12:00 am to 16:30 pm,with a maximum of 0.63 at 16:40 pm.