ULTRA-HIGH TEMPERATURE AND HIGH PRESSURE TURBINE PLANT

摘要

PURPOSE:To improve the efficiency of a generating plant sharply as a whole by causing main-steam pipes, which connect a boiler in each plant unit to a top turbine in each plant unit, to be interconnected by means of a warming pipe, and then incorporating a closing valve into the warming pipe. CONSTITUTION:There are set up a plurality of plant units A,B. The main steam in a high-temperature and high-pressure, which is generated in a boiler 1, is fed into each of the steam turbines 6,9,12,14 located downstream from a top turbine 3. The mainsteam pipes 2, which connect a boiler 1 in each of the plant units A,B to a top turbine 3 in each of the plant units A,B, are interconnected each other by means of a warming pipe 21. In the line of the warming pipe 21 are provided a flow control valve 22 and a gate valve 23. Thereby, a thermal stress generated in an inner casing can be suppressed to a low level, end therefore, a DSS operation can be adopted so that the efficiency of a generating plant as a whole can be improved by a large margin.