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Show PROOF-OF-CONCEPT DEMONSTRATION OF JOHN ZINK HI BURNER FOR DIESEL APPLICATION OF RADIAN CORPORATION'S HYBRID LOW NOx PROCESS Ronald D. Bell Radian Corporation Austin, TX 78720-1088 INTRODUCTION t~ ~lc, / /2,/ 5 Radian Corporation, in cooperation with Allied-Signal Inc., conducted a set of tests to demonstrate the applicability of a standard, commercially available John Zink HI burner for stationary diesel engine applications of Radian's patented Hybrid Low NOx Process. Testing was performed at John Zink's Tulsa facility in July 1990. A primary goal of the test was to document the ability to fire diesel fuel using exhaust from a diesel engine as the only oxygen source. If diesel fuel could be fired in the afterburner without the addition of makeup air, the most fuel-efficient operation of the afterburner would be achieved. An additional goal was .to maintain stable, reliable, soot-free operation of the burner while firing under reducing conditions. This paper documents the test conditions, results, and conclusions of the demonstration test. BACKGROUND Radian Corporation had previously completed successful demonstration testing of its patented Hybrid Low NOx Cogeneration Process using propane as fuel in the afterburner for a diesel application. The Hybrid Process demonstrated NOx reductions to levels below 25 ppmv and CO to below 50 ppmv by utilizing an oxygen "burnout" step, a catalytic reduction step, and a catalytic oxidation step. In the reducing step, 1 to 5% excess propane fuel was fired in an afterburner a~ 2000 to 2500°F. Firing in the reducing mode resulted in essentially no oxygen leaving the high temperature zone of the afterburner; the CO and H2 formed here reduced NOx across the reduction catalyst. Excess CO and H2 were oxidized across the oxidation catalyst (Figure 1). -1- |