Through numerical simulation and model test

the flow field of the SCR flue gas denitration equipment in a 600 MW unit was investigated.Guide plates were added upon the damper to increase the flue gas velocity to higher than 8m/s

which solves the problem of large amount of ash deposition on the damper.Moreover

all the velocity distribution and NH3 mole fraction distribution of the flue gas entering the first catalyst layer

the angle between the flue gas steam and the vertical direction

and the system resistant satisfied the technical requirements.The physical model was applied to measure the velocity field and the alternative gas concentration field at entrance of the first layer of catalyst.By firework tracer

the system streamlines were observed.Ash deposition test was also carried out at low load conditions

of which the results verified the conclusions of the numerical simulation.