Being limited by land area and economic cost

the layout of flue gas duct system is generally compact

and numerous special-shaped pieces exist in this system

such as the bend pipe

rectangle-circle connectors and expansion and contraction sections. The fluid resistance in the system mainly includes frictional resistance and local resistance. The former is associated with the boundary layer flow characteristics and the pipe length

it can be reduced by rationally arranging the layout of the pipes. When the fluids flow through these shaped parts

the main factors producing the local resistance are the dramatic changes in the magnitude and direction of velocity

pressure and flow deflection vortex and flow separation. On the basis of the Fluent software

numerical simulation on flow flied and its resistance characteristics near the 90° shrunk bend pipe connector in the flue gas duct was carried out. Moreover

guide plate was installed to optimize the flue duct system

thus to reduce the local resistance in the flue gas duct and further lower the total resistance and increase the power generation economic benefits. The simulation results have a guiding significance to the optimization design of the flue gas ducts.