According to the design parameters and operating data of the 600 MW unit in Datong Power Plant

by using equivalent enthalpy drop method

this paper analyzes the technology economy and the energy saving potential of the unit employing different waste-heat utilization technologies

such as installing the low pressure economizer

the association system of the low pressure economizer and the air heater

and the bypass flue gas channel system.The results show that

by using the bypass flue gas channel system

the heat of flue gas will be brought into the furnace by the secondary air

this means the heat of the flue gas will be fully absorbed by boiler tubes

thus this technology's economic efficiency is the highest.This result can provide references for the upgrading of the domestic power plants.