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LOW NOX STRATEGY FOR COMBUSTING HIGH NITROGEN CONTENT FUELS
Citation:
Srivastava, R. LOW NOX STRATEGY FOR COMBUSTING HIGH NITROGEN CONTENT FUELS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/7-90/002 (NTIS PB90155664), 1990.
Description:
The report gives results of an evaluation of a multistaged combustion urner (designed for in-furnace NOx control and high combustion efficieiicy) for [high nitrogen content fuel and waste incineration application in a 1.0 MW package boiler. simulator. A low NOx precombustion chamber burner has been reduced in size by about a factor of two (from G00 to 250 ms first-stage residence time) and coupled with: (1) air staging, resulting in a three- stage configuration; arid (2) natural gas fuel staging, yielding up to four stoichionietric zones. atural gas, doped with ammonia to yield a 5.8% fuel nitrogen content, and distillate fuel oil, doped witli pyridine to yield a 2. 0% fuel nitrogen content, were used to simulate high nitrogen content fuel/waste mixtures. Minimum nitric oxide (NO) emission levels of 160 and 110 ppm (corrected to 0% oxygen, O2) were achieved for the natural gas and fuel oil tests, respectively, corresponding to about 85% reduction in NOx emissions compared to uncontrolled emissions from a conventional burner mounted on a 0.7 MW commercial package boiler. nder the conditions tested, net chemieal destruction of NO via reburning does not seem to be evident. This may be due to the existence of rather low primary NO concentrations before the application of reburning. However, a beneficial dilution caused by reburning may provide lower NO emissions.
