The current reburning experiments use a premixed propane burner along with a small amounts of NH3 to simulate coal combustion gases, and to test coal and feedlot biomass as reburn fuels in order to determine their NOx reducing capability. The reburn fuel is fed from a dry solids feeder. The reburn injection ports are located below the tip of the premixed propane flame, after all of the NO has been formed in the primary zone. An Enerac 3000E gas analyzer is then used to measure the concentration of oxygen and NO in the final sampling port.

Funding Sources

1. Department of Energy, Pittsburgh, University Coal Research, "Development of all-solid-state sensors for Measurement of Nitric Oxide and Ammonia concentrations by Optical Absorption in Particle-laden Combustion Exhaust Streams," Annamalai with Luct and Caton
2. Department of Energy, Pittsburgh, "Cofiring Coal:Feedlot and Litter Biomass (CFB and CLB) Fuels in Pulverized Fuel and Fixed Bed Burners," 6/15/2000 to 12/31/2002
3. Texas Advanced Technology Program, 2000-2002, "Co-firing Coal:Biowaste (poultry waste) Blends in a Boiler burner,"

Modeling-Reburn

The mixing model between reburn fuel stream and main gases can be classified into two types: a) the reburn jet is entrained into the main flue gas flux and b) the main flue gas is entrained into the reburn jet. The second model is used with a mixture of simulated reburn gases. More detailed model including pyrolysis, volatile and char combustion is under development. Here is a sample result when a mixture of CH4, NH3, HCN , O2 and N2 are injected in to NO containing main gases.