太阳能辅助热电联产机组供热、发电及调峰性能分析

Analysis of heating,power generation and peak shaving performance of solar assisted cogeneration units

针对新能源存在不稳定性导致电网调峰问题日益严重的现状,结合较为成熟的光煤互补发电技术及多热源联合供热调峰系统,设计光煤混合供热发电系统,使热电联产机组具有一定的调峰能力。以某300 MW热电联产机组为研究对象,利用Ebsilon Professional软件搭建发电、供热可灵活调节的太阳能辅助热电联产系统,基于供热机组实际双机运行工况,在保证供热负荷前提下,分析太阳能辅助双机热电联产机组耦合方式,比较耦合前后双机调峰性能。结果表明:凝汽器出口与太阳能集热系统换热器间的管道上设置动态节流阀,改变太阳能集热系统辅助供热机组的运行模式,能够实现发电、供热、调峰一体系统的灵活运行;其中,以太阳能集热系统仅用于补充供暖的运行方式调峰能力最强,太阳能辅助单机供热前后调峰容量比值为0.76,太阳能辅助双机供热前后调峰容量比值为0.55,太阳能辅助承担最大供热负荷的1号机组在调峰容量及调峰补偿上效果最佳。

In view of the increasingly serious problem of power grid peak regulation caused by the instability of new energy,combined with the relatively mature photo-coal complementary power generation technology and the multi-heat source combined heating peak shaving system,the light-coal mixed heating power generation system was designed to make the cogeneration unit have a certain peak regulation capacity.Based on the actual operating conditions of the heating unit and the premise of ensuring the heating load,the coupling mode of the solar-assisted dual-engine cogeneration unit was analyzed,and the peak regulation performance of the two-engine was compared before and after coupling.The results show that,a dynamic throttle valve is installed on the pipeline between the condenser outlet and the heat exchanger of the solar collector system,and the operation mode of the auxiliary heating unit of the solar collector system can be changed,which can realize flexible operation of the integrated system of power generation,heating and peak regulation.Among them,the solar thermal collection system is only used for supplementary heating,the peak regulation capacity ratio is 0.76,and the ratio of solar auxiliary double-heating supply before and after peak regulation capacity is 0.55.The No.1 unit which is assisted by solar energy to bear the maximum heating load has the best performance in peak regulation capacity and peak regulation compensation.