Abstract
Application of natural gas reburning for NOx control involves the injection of fuel jets into the furnace cavity. In the region near the jets both mixing and reaction occur simultaneously, leading to the observation that finite-rate turbulent mixing strongly influences chemical NOx reduction. In this paper, the effect of finite-rate mixing on reburn performance is investigated using a simplified integral model of a turbulent, reacting jet (based on the Two-Stage Lagrangian model of Broadwell and Lutz). Various sets of mixing-influenced reburning data from Kolb et al. are modeled and compared with plug flow reactor (PFR) calculations. Although the mixing times are relatively fast in these experiments, results show that the effect of finite-rate mixing is to significantly improve reburning performance as compared with the reburning efficiency obtained from the perfectly mixed limit (PFR simulations). In all cases considered, the predictions of the finite-rate mixing model are in better agreement with the data than the infinitely fast mixing (PFR) model. This implies that finite-rate mixing plays an important, positive role in reburning performance. The cause of the improved reburning performance in the finite-rate mixing environment is described using reaction-rate analysis.
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