Numerical simulation and optimization of flow filed in an SCR denitration reactor for cement kiln
High efficient denitration of SCR reactor relies on homogeneous flow field distribution of the catalyst surface.However,with-out implementing optimization measures,the unique structure of the SCR reactor in cement industry inevitably leads to an uneven flow field at the catalyst surface.The flow field in the SCR reactor of a cement factory was computed through numerical simulation,and a detailed investigation was conducted on the impact of different bend pipe configurations and guide plate settings on pressure drop and flow uniformity.The findings demonstrate that the bias flow at the outlet of the bend pipe can be improved by setting a turning vanes in the bend pipe.Moreover,the resistance of the variable cross-section bend is smaller than that of the constant cross-section bend.The uniformity of catalyst surface velocity is improved significantly after the guide plates are set in the gradual expansion section.By incor-porating double layer guide plates into the gradual expansion section,the uniformity of catalyst surface velocity can meet the technical specification.With the increase of the distance between guide plates,the pressure drop decreases at first and then shows no obvious change,and the velocity uniformity has no obvious change.As V-shaped angle of guide plate increases,the pressure drop gradually increases,and the relative standard deviation of the flow velocity decreases first and then increases.
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