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APPLICATION OF STAGED COMBUSTION AND REBURNING TO THE CO-FIRING OF NITROGENATED WASTES: CHEMICAL AND BIOLOGICAL ANALYSES
Citation:
Linak, W., J. McSorley, R. Hall, R. Srivastava, J. Ryan, J. Mulholland, R. Williams, M. Nishioka, V. Houck, J. Lewtas, AND D. DeMarini. APPLICATION OF STAGED COMBUSTION AND REBURNING TO THE CO-FIRING OF NITROGENATED WASTES: CHEMICAL AND BIOLOGICAL ANALYSES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-90/046.
Description:
The paper gives results of an evaluation of a 0.6 MW precombustion chamber burner, designed for in-furnace NOx control and high combustion efficiency (CE) for high nitrogen content waste co-firing. The 250- to 750-ms residence time precombustion chamber burner mounted on a prototype water-tube package boiler simulator used air staging and in-furnace natural gas reburning to yield up to four stoichiometric zones. Natural gas doped with ammonia and No. 2 distillate fuel oil doped with pyridine were used to simulate high nitrogen content fuel/waste mixtures. Minimum NO emission levels correspond to about 85% reduction in NOx emissions compared to uncontrolled emissions from a conventional swirl burner mounted on a 0.7-MW commercial package boiler. CO emissions for these burner characterization tests indicated CEs > 99%. The low NOx precombustor was then used to examine the co-firing characteristics of a nitrogenated pesticide containing dinoseb in a fuel-oil/ xylene solvent. The dinoseb formulation as fired contained 6.4% nitrogen. NO emissions without in-furnace NOx control exceeded 4400 ppm (at 0% O2). When NOx controls in the form of air staging and natural gas reburning were employed, these emissions were reduced to <150 ppm (96% reduction). Average CO and total hydrocarbon emissions were typically <15 and 2 ppm, respectively.