Regulation performance and optimal design of the gas adjust-screen in boiler steering rooms

Numerical simulation and particle image velocimetry (PIV) were used to solve the uneven distribution of the flue gas flow in the rear flue. Three type of gas adjust-screen were designed and two assessment indicators, non-uniform coefficient and velocity deviation, were introduced to describe the quantitative assessment of the flue gas flow field uniformity. Variation of two-parameter were observed before and after joining adjustment screen to the flow field. It is shown that the distribution of flow field get better, especially the vertical layout and arc shaped adjust-screen after integration and optimization, the non-uniform coefficient decreased from 3.18 to 1.97 in the left flue, and the coefficient decreased from 1.68 to 1.57 in the right flue, the velocity deviation changed to approximately 1.0. The effect of the optimized regulation of screen was tested by PIV. The results indicate that the optimized regulation screen can improve the gas distribution inside of the flue better and be used in engineering practices.