冷热电三联供系统的优化研究

Study on Optimization of CCHP System

冷热电联供系统主要应用于大型集中性供能系统中。作为分布式能源的一种,冷热电联供系统具有节约能源、改善环境、提高电力综合效益的优势。一般情况下,三联供系统是以天然气为燃料带动燃气轮机、微燃机或内燃机发电机等燃气发电设备运行,产生的电力供应用户的电力需求,系统发电后排出的余热通过余热回收利用设备(余热锅炉或者余热直燃机等)向用户供热、供冷。通过这种方式提高整个系统的一次能源利用率,实现能源的梯级利用,还可以提供并网电力作能源互补,经济收益和效率均得以提升。研究较为常见的燃气轮机中的一种蒸汽型吸收式冷热电联产系统,对不同配置方式和运行方式进行横向与纵向交叉比较,以完成系统优化研究。

CCHP system is mainly used in large-scale centralized energy supply system.As a kind of distributed energy,CCHP system has the advantages of saving energy,improving the environment and improving the comprehensive benefits of power.In general,the triple supply system uses natural gas as fuel to drive gas power generation equipment such as gas turbine,micro-gas turbine or internal combustion engine generator to operate.The generated power supplies the power demand of users.The waste heat discharged by the system after power generation is used to supply heat and cooling to users through waste heat recovery equipment(residual heat boiler or waste heat direct combustion engine,etc.).In this way,the primary energy utilization rate of the whole system can be improved,the cascade utilization of energy can be realized,and the grid connected power can be provided for energy complementation,so the economic benefits and efficiency can be improved.This paper studied the common gas turbine-steam absorption CCHP system,and compared the different configuration and operation modes horizontally and vertically to complete the system optimization research.