In order to compare the effects of energy conservation and resistance reduction between circular flues and square flues

this paper takes the flue gas duct optimization project of unit No.2(600 MW) of Yangxi Power Plant as the example

to investigate the resistances of flue gas duct before and after the reformation

by test measurement and numerical simulation. The results show that

after the circular flue was applied

the flue resistance reduced by 570 Pa and declined by 76.7%

and the power consumption sharply reduced by 9.6%. This study has very important theoretical guidance and engineering significance for the subsequent flue gas duct reformation.