热电联产是节能降耗的有效途径.本文基于单耗分析阐述了一般化供热系统的理论框架,结合热电联产系统热力学分析指出当前常规热电联产抽汽供热模式的不合理之处.在此基础上进行热电联产常规抽汽供热模式和循环水直供直连供热模式的对比分析.利用流程模拟软件构建出300 MW热电联产机组热力系统模型,并对该模型进行了变工况计算,分析汽轮机背压变化对机组发电功率的影响.结果表明;对于300MW热电联产机组,循环水直供模式比传统抽凝供热模式在电厂侧发电功率增加近31MW,收效显著,该供热模式节能潜力极大.
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