汽轮机的背压值不仅对汽轮机的运行安全性、经济性产生很大的影响，而且还影响到汽轮机的调节性能，同时还在很大程度上决定了汽轮机的循环水消耗量及向大气中排放热水（ 汽） 量的大小。以２００ＭＷ 汽轮机为例，对背压变化时上述各量的变化情况进行了计算分析，最后给出了在考虑这些因素基础上的综合最佳运行背压的确定方法 Turbine back pressure not only affects the safety and economy of steam turbines, but also affects the performance of steam turbines. At the same time, it also determines the circulating water consumption of steam turbines to a large extent and releases them into the atmosphere Hot water (steam) the size of the amount. Taking the 200MW steam turbine as an example, the change of the above quantities during the change of backpressure is calculated and analyzed. Finally, the method of determining the optimal backpressure based on these factors is given