集成蒸汽喷射器的热电解耦系统全工况性能分析

Performance Analysis of a Heat-power Decoupling System Integrated with Steam Ejectors in the Full Condition Rang

为实现热电联产机组的热电解耦,提出了一种集成蒸汽喷射器的热电解耦系统,并建立了系统全工况计算模型。以某350 MW热电联产机组为案例机组,集成蒸汽喷射器的热电解耦系统作为喷射器供热机组,对两机组的运行灵活性和节煤率进行对比。结果表明:当供热量为700 GJ/h时,热电联产机组和喷射器供热机组最低电负荷率分别为50%和34%,喷射器供热机组电负荷调节范围更大;与热电联产机组相比,喷射器供热机组在一定情况下经济性更高;喷射器供热机组在高引射率、低电负荷率和低热负荷率下运行较为节能;供热量为200 GJ/h时,电负荷率低于85%才能保证喷射器供热机组相比热电联产机组经济性更好;电负荷率为80%时,热负荷率低于0.91才能保证喷射器供热机组相比热电联产机组经济性更好。

In order to realize the heat-power decoupling of cogeneration units,a heat-power decoupling system integrated with steam ejectors was proposed,and the calculation model of the system within the full condition rang was established.Taking a 350 MW cogeneration unit as an example,the heat-power decoupling system integrated with steam ejectors as the ejector heating unit,so as to compare the operation flexibility and coal saving rate of the two units.Results show that when the heating load is 700 GJ/h,the minimum electric load rate of cogeneration unit and ejector heating unit is 50%and 34%,respectively.Furthermore,electric load regulation range of the ejector heating unit is larger.Compared with cogeneration unit,the ejector heating unit is more economical under certain conditions.Moreover,the ejector heating unit is more energy-saving under the condition of high ejection rate,low electric load rate and low heat load rate.To ensure that economy of the ejector heating unit is better than that of the cogeneration unit,it requires that the electric load rate is less than 85%at the heating load of 200 GJ/h,or the heat load rate is lower than 0.91 at the electric load rate of 80%.