| 摘要 |
PURPOSE:To improve efficiency of a steam turbine plant, by taking off extraction steam from the side approximate to a steam inlet of a low pressure turbine in a high exhaust vacuum side and the side approximate to a low pressure turbine in a low exhaust vacuum side. CONSTITUTION:Driving steam 5 is allowed to circultively flow in a high pressure turbine 6, reheater 7 and an intermediate pressure turbine 8 successively, and fed to low pressure turbines 4H, 4L. A plural number of feed water heating extraction pipes 10a-10f are provided to a place approximate to a steam inlet J of a high exhaust vacuum side low pressure turbine 4H. Extraction pipes 11a-11d are provided to a place approximate to a steam outlet R of a low exhaust vacuum side low pressre turbine 4L. A less quantity of the extraction pipes 11a-11d than the quantity of the extraction pipes 10a-10f can almost equalize an inflow of steam and a flow speed of exhaust of the low pressure turbines 4H, 4L. While a flow path of steam in a condenser 1 is never blocked. In this way, efficiency of a steam turbine plant can be improved. |
