由凝结水泵出口引出部分凝结水进入再生热交换器,吸收蒸汽发生器排污热量,是目前蒸汽发生器排污利用较普遍的回收热量方式.以某990MW核电机组为例,在蒸汽发生器排污量和排污参数一定的情况下,分别计算凝结水抽取份额、排污热量回收利用方式的不同对循环热效率、二回路管道热效率和全厂热效率的影响.结果表明,随着凝结水抽取份额的增加,循环热效率降低,而二回路管道热效率提高,当二者的相对变化量相等时,全厂热效率达到峰值；同时,考虑到排污水化学处理系统的安全性要求,确定蒸汽发生器排污热量回收利用的最佳方案:凝结水抽取份额为2.5％,且排污热量回收到除氧器.%Extracting some condensate water from the condensate pump export to the regenerative heat exchanger in order to absorb the heat from steam generator' s blowdown is a widespread pattern of heat recovery. Taking an 990MW nuclear power plant for example in this paper, under the condition of steam generator' s blowdown capacity and parameters are fixed,the influence of condensed water ratio and recovery heat pattern on the cycle thermal efficiency,the secondary circuit piping thermal efficiency and the whole plant thermal efficiency are respectively calculated. The result shows that the cycle thermal efficiency decreases and the secondary circuit piping thermal efficiency increases with the increase of condensed water ratio. The whole plant thermal efficiency reaches a peak when the relative variation of cycle thermal efficiency is equal to that of secondary circuit piping thermal efficiency. Simultaneously, considering the safety of blowdown chemical water treatment system,the optimized case is: condensed water ratio 2. 5 percent and recovery heat into deaerator.
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