In an air drier, part of the effluent air stream is to be recycled in an effort to control the inlet water content (i.e., humidity). The figure shown is an schematic representation of the process. The solids contain 20% water and 1,000 kg/hr are to be handled. The dried solids are to contain a maximum of 5% water. The partial pressure of water vapor in the fresh air is 10 mm Hg and in the outlet must be limited to 200 mm Hg. The recycle stream is to be regulated so that the partial pressure of water input in air to the drier shall be 50 mm Hg. Calculate the rates of fresh air, recylce air, and the total air to the drier. Assume that the process operates at a constant pressure of one standard atmosphere.
In an air drier, part of the effluent air stream is to be recycled in an effort to control the inlet water content (i.e., humidity). The figure shown is an schematic representation of the process. The solids contain 20% water and 1,000 kg/hr are to be handled. The dried solids are to contain a maximum of 5% water. The partial pressure of water vapor in the fresh air is 10 mm Hg and in the outlet must be limited to 200 mm Hg. The recycle stream is to be regulated so that the partial pressure of water input in air to the drier shall be 50 mm Hg. Calculate the rates of fresh air, recylce air, and the total air to the drier. Assume that the process operates at a constant pressure of one standard atmosphere.
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