In calculating strongly nonuniform reactors by the method of homogenization, the method must be refined (the largest errors are observed at the locations of the nonuniformities and near them). There are many papers on the elmmination of these errors (see, for example, [i, 2]). A method for constructing refined finite-difference equations for a two-dimensional heterogeneous reactor is developed in [3][4][5][6][7][8].* Its starting approximations coincidewith the formulas of the traditional method of homogenization, while the refinements, achieved with the use of this method in the approximations recommended for practical use, substantially improve the computational results obtained for nonuniform grids. In this work this method is extended to a three-dimensional geometry.

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