OCR Text |
Show implications for the potential of the combustor for new design stationary gas turbine engines where combustor residence time may not be a major constraint. This combustor concept was scaled up to a size commensurate with a single can from a multiple can 25 MW machine. Full scale rig testing of the hardware was performed and the results indicate a successful scaleup procedure. N0X emissions less than 45 ppm were recorded for clean fuels while on "dirty fuels" the N0X levels were around 75 ppm. These results are consistent with those for the bench scale combustor at the residence time used in the scaled up combustor (4 msec). Nitrogen containing fuels tested at full scale include a distillate cut shale oil containing 0.25 percent nitrogen and number 2 oil doped to 0.5% nitrogen as pyride. Future plans call for examining the combustor on an SRC II fuel, a residual shale oil, and a petroleum-derived residual oil. Stationary Reciprocating Engines Stationary reciprocating engines are used both as compressor drives and for generation of electric power. The stationary engines are large bore, two-and four-cycle devices operating at relatively low speed as compared to automotive engines. Dependent on the fuel, the engines may be either diesel or spark ignition. While the N0X control techniques developed for stationary continuous combustion systems are applicable in principle, the intermittent high pressure combustion processes in reciprocating engines present difficulties in application. The goal of the reciprocating engine program is to achieve a 50 to 60 percent reduction In N0X without increase in carbonaceous emissions and with a minimum impact on fuel efficiency. The initial concept screening has been completed and a prioritized list has been prepared for diesel and spark ignition categories. These concepts will be screened on laboratory engines and the most promising technique for each category will be tested on a full scale engine for a short period. Longer field test periods are planned for a subsequent program. 3-41 41 |