A Study on Turbine Bypass System in a 500MW Rated Coal Fired Supercritical Thermal Power Plant with Sliding Pressure Operation

변압운전 방식의 500MW 초임계압 석탄 화력발전소 터빈 우회계통에 제어에 관한 고찰

Many years ago, most of thermal power plants built in this country were of subcritical pressure, of medium or small size, of constant pressure operations and of drum type steam generators with circulation type boilers. But, nowadays almost all of them were of high efficiency, of supercritical pressure, of big capacity, of sliding pressure operations, and of once through type steam generators. Presently built once through boilers introduce turbine bypass systems to variable pressure operation which eliminates unexpected materials in boiler tube during startup, minimizes fuel loss by short startup period and eventually improve both total efficiency and power system stability.