基于Co-ah循环的热电联产集中供热方法

District heating system based on Co-ah cycles in combined heating and power systems

为了降低大型热电联产集中供热系统能耗,该文提出了一种基于Co-ah循环的热电联产集中供热方法。在热力站设吸收式换热机组,使热网回水温度降低至约20℃,在热电厂内经汽轮机凝汽器、吸收式热泵和调峰热源等环节将热网回水逐级加热,形成热网的吸收式(Co-ah)循环。通过拉大供回水温差而大幅增加热网的输送能力,并通过回收汽轮机排汽余热而显著提升热电厂供热能力和能源利用效率。

A district heating system based on the Co-generation-based absorption heat exchange （Co-ah） cycle in the cogeneration system was design to reduce energy consumption of district heating systems in large cogeneration systems. In the heating system substations, the return water temperature is reduced to about 20℃ through absorption heat exchangers. In the cogeneration plant, the circulating water is heated by the condenser exhausted vapor, the absorption heat pump, and the peak load heater. Compared with traditional heating systems, this system runs with a higher circuit temperature drop so that the heating network delivery capacity increased dramatically. The capacity of district heating system and the energy efficiency of the combined heating and power （CHP） system is significantly increased by the recovery of the exhausted heat from the condensers.