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以某近海厂址为例,综合机组投资、运行费用、发电收益等因素对汽轮机背压、末级叶片及低压缸数量的选择等进行了研究,得到以下结论,在相同的循环水参数和总凝汽器换热面积条件下,多压凝汽器平均压力低于单压凝汽器压力;计算得到了低压缸总排汽面积,获得三缸四排汽(长叶片)和四缸六排汽(短叶片)两种候选机型;采用动态经济比较法进行了初步分析,三缸四排汽双背压(长叶片)方案优于四缸六排汽三背压(短叶片)方案。
Taking an offshore site as an example, the turbine backpressure, the final blade and the selection of the number of low pressure cylinders are studied based on such factors as unit investment, operation cost and power generation yield. The following conclusions are obtained: at the same circulating water parameter and total condensate The average pressure of the multi-pressure condenser is lower than the pressure of the single-pressure condenser; the total discharge area of the low pressure cylinder is calculated, the three-cylinder four-row steam (long blade) and the four-cylinder six-row steam (Short vane). The dynamic three-cylinder four-row steam double-back pressure (long vane) scheme is superior to the four-cylinder six-row steam three-backpressure (short vane) scheme based on the dynamic economy comparison method.