Reburning chemistry-mixing model

Mixing is recognized to have a significant impact on reburning performance. Current approaches to represent mixing range in complexity from distribute d addition of reagents to three-dimensional computational fluid-dynamics mo deling. This work demonstrates that an approach that combines rc burning ch emistry with a distributed addition of reagents in the mixing area can be u sed to describe the main features of reburning. The characteristic feature of the model is utilization of the integrated approach to describe the rebu rning process. This approach includes: (1) evaluation of mixing characteris tics of the combustion facility under investigation by using a single jet i n doss-flow or CFD modeling: (2) utilization of plug now reactors to descri be processes that occur in the boiler; (3) the distributed addition of reag ents; and (4) the inverse-mixing approach. The model is validated against e xperimental data obtained in five combustion facilities ranging in scale fr om bench-to large pilot-scale. (C) 2001 by The Combustion Institute.