集成蒸汽喷射器的热电解耦系统全工况性能分析

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%.