Evaluation of Selective Non-Catalytic Reduction of NOx for Jet Engine Test Cells
Final rept. 31 Mar 1990-30 Sep 1994
CALIFORNIA UNIV IRVINE COMBUSTION LAB
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This research evaluates the use of selective non-catalytic reduction SNCR for the removal of oxides of nitrogen NOx in a jet engine test cell JETC. The plume effluent in the exhaust stream of a TF30-P111 and a TF33-P9 engine in a jet engine test cell was first characterized. A test stand and five-point sample probe were designed and built to make measurements directly behind the engine nozzle. Data were collected in conjunction with actual engine tests. Temperature, NOx, carbon monoxide CO concentration, and velocity were among the characteristics measured radially and axially in the plume. These parameters were used to determine baseline conditions for the chemical kinetic modeling of SNCR using ammonia, cyanuric acid, urea, and hydrazine with additives of hydrogen, methane, and hydrogen peroxide. The measurements revealed that temperatures are marginal for the application of SNCR in JETCs except at high throttle and afterburner settings on the P111 engine. The chemicals themselves have limited range of applicability. Additives help to extend their usefulness, mostly by shifting the temperature window down. Urea and hydrogen peroxide yielded the best range of the chemicals tested. However, this combination may reduce NOx in the entire exhaust stream by up to only 25 at military power on the high-performance P111 engine. The findings of this work have attractive implications for non-JETC applications operating near the same conditions.
- Air Pollution and Control