集成蒸汽喷射器的热电协同系统全工况性能分析

Performance Analysis of a Heat-Power Synergy System Integrated with Steam Ejectors Under the Full Working Condition

为实现热电联产机组的热电解耦和深度调峰,提出集成蒸汽喷射器的热电协同系统,并建立了系统全工况分析模型。以某330 MW热电联产机组为例,集成蒸汽喷射器的热电协同系统作为喷射器协同机组,对比分析了2个机组的运行灵活性和经济性。结果表明:当供热量为795 GJ/h时,热电联产机组与喷射器协同机组的电负荷率调节范围分别为45.99%~81.75%和15.78%~100%,喷射器协同机组具有更高的运行灵活性,机组深度调峰能力突出;在特定工况下,喷射器协同机组在峰谷周期内的整体经济优势明显;喷射器引射比越大,电力高峰期锅炉负荷率越高,峰电量与谷电量的上网电价比越大,机组的整体经济优势越明显;随着供热量的增加,系统的经济收益呈先升高后降低的趋势。

To realize the heat-power decoupling and deep peak regulation of cogeneration units,a heat-power synergy system integrated with steam ejectors was proposed,and the analysis model of the system under the full working condition was established.Taking a 330 MW cogeneration unit as a reference unit,the heat-power synergy system integrated with steam ejectors was used to be the ejector synergy unit,then the operational flexibility and economic characteristic of the two units were compared.Results show that when the heating load is 795 GJ/h,the electric load rate adjustment range of the cogeneration unit and ejector synergy unit is 45.99%-81.75%and 15.78%-100%respectively,which indicates the ejector synergy unit has higher operational flexibility and outstanding deep peak regulation capability.The overall economic advantage of the ejector synergy unit in the peak-valley cycle is significant at specific working conditions.Moreover,since high ejection rate will produce high boiler load rate during the peak power period,and considering the high ratio value of peak and valley power prices,the ejector synergy unit shows more overall economic advantages.The converted generation income of the ejector synergy unit will firstly increase and then decrease with the increase of heating load.