Peter Martin Maly

Optimization of advanced reburning via modeling

The advanced reburning (AR) process is an integration of basic reburning and N-agent injection. The efficiency of AR depends on many factors, including the amount of the reburning fuel, the amount and location of N-agent injection, and spray characteristics. These parameters can be optimized via computer modeling. This paper describes a model that combines a detailed chemical mechanism with a simplified representation of mixing to describe the AR-lean process, a combination of basic reburning and N-agent coinjection with overfire air (OFA). The model takes into account mixing and thermal characteristics of a 300 KW combustion facility, which was used for experimental studies in support of model development. Modeling suggested that the efficiency of AR-lean strongly depends on amounts of the reburning fuel and N-agent, flue gas temperature at the point of OFA/N-agent injection, and N-agent evaporation time. The model described the most important features of AR-lean. Application of the model for optimization of AR-lean performance in the test facility was demonstrated.