SUBCRITICAL PRESSURE HIGH TEMPERATURE CALORIC POWER-GENERATING PLANT AND SUBCRITICAL PRESSURE HIGH TEMPERATURE TRANSFORMATION OPERATION ONCE-THROUGH BOILER

摘要

PROBLEM TO BE SOLVED: To provide a caloric power-generating plant having a power-generating output of medium and low volume (a power-generating output of a single unit of power-generating device is in a range of 100MW-class to 400MW-class) and a boiler used for it.SOLUTION: Conditions of steam generated by a boiler and supplied to a steam turbine are subcritical pressure and high temperature (a turbine inlet temperature of 593°C or more). For example, the subcritical pressure high temperature caloric power-generating plant is constituted by a combustion boiler facility, steam turbine power-generating facility and condensed water supplying facility and the like. The boiler facility is constituted by a coal pulverizer, burner, furnace, spiral water wall pipe, fuel economizer, high temperature super-heater, high temperature reheater, and steam separator and the like. A tilt angle of the spiral water wall pipe is set to 10 to 20 degree.