METHOD FOR COLD CLEANUP AT START OF VARIABLE PRESSURE ONCE-THROUGH BOILER

摘要

PROBLEM TO BE SOLVED: To provide a method for cold cleanup at start of a variable pressure once-through boiler in which suspension is prevented from depositing at the elbow part of a furnace wall tube of a furnace and the furnace wall tube can be protected against overheating and burning by preventing generation of a turbulence in the flow within the tube. SOLUTION: A part of blow water being discharged to the outside of a system is recirculated to the inlet of an economizer by starting a boiler recirculation pump 23 in the way of a blowing process thus increasing the flow rate of blow water passing through the economizer and a furnace path.