The blending of different refined, intermediate, or finished diesel products is a common practice for a petroleum refinery to maximize profit by reducing the giveaway of final diesel products with desired specifications and to avoid the reprocessing of in-stored off-spec products. Because the diesel combustion in engines has a significant impact on air quality in terms of NOx emission, diesel blending should also be evaluated with a new prospect of NOx emission. A comprehensive diesel blending model for petroleum refineries is developed which can simultaneously predict blending oil properties and potential NOx emissions and additionally optimize blending ratios among different blends to maximize the blending profit of diesel fuels subject to blending quantity, blending property, and potential NOx emission constraints. Based on the study, a Microsoft Excel tool has also been developed. The efficacy of the development is demonstrated by a comprehensive case study.
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