Analysis on the Larger Drain Subcooler Approach of High Pressure Heater and its Countermeasure

High pressure feedwater heater is key auxiliary equipment in an extraction steam system of steam turbine generation unit,which can raise the temperature of feedwater to boiler and reduce the energy loss. The harmfulness and cause of large drain subcooler approach have been analyzed and detailed countermeasures have been put forward in the article combined with the performance design,structure arrangement,fabrication procedure,operation and maintenance,which is useful to the design,fabrication and operation of HP heaters.