基于PCMS流动和传热特性凝汽器的节水节能研究

Research on Water and Energy Conservation of the Condenser Based on Characteristics of Flow and Heat Transfer of PCMS

针对电站凝汽器循环冷却水系统耗水量大的问题。文中提出一种新型的节水方法,该节水方法基于相变悬浮液(phase change materials slurry,PCMS)的流动和传热特性,提出将PCMS与循环冷却水系统结合,通过相变材料颗粒相变多吸热,从而减少循环冷却水流量。结合某闭式的循环冷却水系统,分析了正十八烷微胶囊颗粒质量分数对循环冷却水热物性的影响,并进一步分析其节水节能收益。结果表明:采用正十八烷-水PCMS作为冷却介质时,冷却入口温度在15~23℃时,相变材料使凝汽器压力、循环冷却水量和循环水泵的功率降低,例如当冷却水进口温度为20℃时,采用质量分数为5%的PCMS,可以节约13.78%循环冷却水,30.98%的循环水泵的耗功,系统的节水节能效果明显。

In order to resolve the problem of significant amounts of water, particularly for recirculating cooling water system in steam-electric plants, this paper proposed a new type of water saving methods based on flow and heat transfer characteristics of phase change material slurry. The particles of phase change material were added to the condenser to reduce the volume flow and pump power. Combined with a closed loop cooling system, the relationship between mass concentration of the phase change material particle and the thermal physical properties of fluid, water saving and energy saving were analyzed in detail. Results show that the proposed method reduces the condenser pressure, circulating cooling water and pump power when inlet temperature of the circulating cooling water are between 15-23℃. For example, when the cooling water contain phase change material particle mass concentration of 5%, 13.78% of circulating cooling water and 30.98% of pump power can be saved. The potential interest of water saving and energy saving of new method to the condenser is obvious.