| 摘要 |
PCT No. PCT/US91/09553 Sec. 371 Date Dec. 26, 1991 Sec. 102(e) Date Dec. 26, 1991 PCT Filed Dec. 26, 1991 PCT Pub. No. WO93/13358 PCT Pub. Date Jul. 8, 1993.The control systems for reducing NOx in the combustion systems of past gas turbine engines has incorporated a variety of expensive and complicated techniques to reduce the NOx level. For example, such systems use schemes for introducing more air into the primary combustion zone, recirculating cooled exhaust products into the combustion zone and injecting water spray into the combustion zone. The present system (12) reduces the formation of NOx within the combustion zone by controlling the air/fuel ratio and more explicitly by controlling the air portion of the air/fuel ratio. The present system (12) includes a device (260) for directing a portion of the flow of compressed air exiting a compressor section (22) into an injection nozzle (60,180,330) and into a combustor (40), and further includes a device (298) for reducing the flow of compressed air into the combustor (40). The system (12) monitors an engine (10) parameter, such as a power turbine (30) inlet gas temperature, sends a signal to a computer (314) which interpreters the signal and directs a second signal to a power cylinder (320) which causes a throttling mechanism (288) to move between an open position (296) and a closed position (294) depending on the temperature of the gases. The system (12) provides an economical, reliable and effective method for reducing and controlling the amount of nitrogen oxide (NOx), carbon monoxide (CO) and unburned hydrocarbon (UHC) emitted from the gas turbine engine (10).
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