热电冷三联产系统中制冷废热利用的研究

Study on Recovery of Waste Heat from CCHP Systems

针对热电冷三联产系统中溴冷机排出的大量废热,提出了2种回收制冷废热的方案,并对其一次能耗综合热利用率和综合效率进行了计算与分析.结果表明:2种方案的能源利用率均得到了有效提高,在供冷/供热蒸汽量比较小时,系统相对简单的方案1优于方案2;当供冷/供热蒸汽量比增大时,方案1的一次能耗综合热利用率和综合效率变化极小,而采用热泵的方案2的一次能耗综合热利用率和综合效率均先提高后降低,且在供冷/供热蒸汽量比为3.3 k时达到最大值.

To recover the waste heat from bromine cooler of combined cooling, heat and power （CCHP） system, two solutions were put forward, to which calculation and analysis were carried out on the overall thermal utilization factor of primary energy consumption and the overall exergy efficiency. Results show that the energy utilization rates of both solutions are improved effectively; in the condition that the ratio of cold to steam （RCS） is relatively small, solution 1 with a simpler system is better than solution 2; in the condition that the RCS increases, both the overall thermal utilization factor of primary energy consumption and the overall exergy efficiency of solution 1 hardly change, while those of solution 2 increase first, decrease later on, which reach the maximum when the RCS is 3.3k.