IMPROVEMENT OF DRAIN SYSTEM FOR LOW-PRESSURE HEATER AND ECONOMIC EFFICIENCY ANALYSIS THEREOF

The design defects in drain system of low-pressure heater of 15 MW steam turbine unit in one power plant,such as the low-pressure heater no.2 fully filled with water at low load,small temperature rise of condensate in the low-pressure heater,vibration of extracted steam pipeline in sixth section,and insufficient output capacity of drain pump for the low-pressure heater etc.,affect more greatly the economic efficiency and reliability of the unit in operation.Through analysis of the existing problems and adopting effective improvement measures,the drain system of low-pressure heater can be in operation of more optimized mode,enhancing greatly the economic efficiency and safety of the unit in operation.