Authors: S.B.Reddy Kari, T.M. Knowlton
Abstract: The gas distributor (also called a grid) in a fluidized bed reactor is intended to induce a uniform and stable fluidization across the entire bed cross-section, operate for long periods (years) without plugging or breaking, minimize weepage of solids into the plenum beneath the grid, minimize attrition of the bed material, and support the weight of the bed material during start-up and shut-down. In practice, grids have taken a variety of forms, a few of which are discussed in subsequent pages. Whatever the physical form, all are fundamentally classifiable in terms of the direction of gas entry: either upward, laterally, or downward. The choice depends on prevailing process conditions, mechanical feasibility, and cost. In the past, grid design has been more of an art than a science. However, more recent studies now allow grid designs based on scientific principles.