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中文摘要：
针对传统的压力优化方法在迭代寻优过程中存在的一些问题，结合汽轮机变工况理论，提出汽轮机定负荷下主蒸汽压力的优化计算方法，利用粒子群算法（PSO）对最优压力进行求取，得出不同负荷下主蒸汽压力的最优运行值，并以某1000MW汽轮机为例进行了分析．结果表明：该方法很好地解决了定负荷下压力寻优问题，且可以得出机组的最佳滑压运行方式和最优运行初压，即80％负荷以上时，保持25MPa定压运行；80％负荷以下时，机组保持2阀全开滑压运行模式，在低负荷区2阀全开滑压运行模式的热经济性明显高于3阀全开滑压运行模式．
英文摘要：
To overcome the deficiency of traditional pressure calculation method in iterative optimization, an optimized calculation method for main steam pressure of turbine under given load was proposed, with which optimal operation values of the main steam pressure were obtained at different loads, based on variable condition theory of steam turbine and particle swarm optimization （PSO） algorithm, and simultaneously an analysis was performed by taking a 1 000 MW steam turbine as an example, Results show that the newly proposed method may help to optimize the operation pressure under given load, and to obtain optimal sliding pressure operation mode and initial operation pressure of the unit, namely, for a load above 80%, keeping the unit to operate at a constant pressure of 25 MPa, whereas, for a load below 80%, adopting the sliding pressure operation mode with two valves fully open. The thermal economy of unit at two- valve fully-open sliding pressure operation mode is obviously higher than that of three-valve fully-open slid- ing pressure operation mode in the low load region.
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