Perforated Plates Upwardly-Directed Flow

Main Advantages Simple fabrication most common inexpensive easy to modify hole size easy to scale up or down easy to clean can be flat, concave, convex, or double dished ports are easily shrouded. 

Possible Disadvantages Bed weepage to plenum high pressure drop can be subject to buckling or thermal distortion requires peripheral seal to vessel shell requires support over long spans. 

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The vertical walls are provided with holes to allow both molten TNT and water to flow through. Each segment is also provided with horizontal perforated iron plates. The mixers are equipped with stirrers, rotating at high speed, which can direct the contents of the unit upwards or downwards. 

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