배기가스 재순환이 비예혼합 연소시스템에 미치는 영향
The Effects of Exhaust Gas Recirculation on Non-premixed Combustion System
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We examined the characteristics of NOx emission for CH4/air non-premixed flames using the exhaust gasrecirculation(EGR) methods, which are the air-induced EGR(AI-EGR) and fuel-induced EGR(FI-EGR) methods. Our experimental results show that the NOx emission index(EINOx) decreased with increasing EGR ratio. Inthe range needed to form a stable flame, the reduction rate of EINOx for the FI-EGR method was approximately29% when the EGR ratio was 20%, and the reduction rate for the AI-EGR method was approximately 28%with 25% of the EGR ratio. According to the flame structure based on numerical results, high temperatureregions for the FI-EGR method were narrower and lower than those for the AI-EGR method at the sameEGR ratio. Furthermore, based on the experimental results for swirl flames, the reduction rate of EINOx forthe FI-EGR method was approximately 49% with 15% of the EGR ratio, while the maximum reduction ratefor AI-EGR method was approximately 45% with 25% of the EGR ratio. Consequently, we verified that theFI-EGR method was more effective than the AI-EGR method in reducing NOx emission for non-premixedflames with EGR. We expect that the results of this study will provide fundamental information relating tohybrid combustion systems, which can be used in the design of combustion systems in the future.
Abstract
We examined the characteristics of NOx emission for CH4/air non-premixed flames using the exhaust gasrecirculation(EGR) methods, which are the air-induced EGR(AI-EGR) and fuel-induced EGR(FI-EGR) methods. Our experimental results show that the NOx emission index(EINOx) decreased with increasing EGR ratio. Inthe range needed to form a stable flame, the reduction rate of EINOx for the FI-EGR method was approximately29% when the EGR ratio was 20%, and the reduction rate for the AI-EGR method was approximately 28%with 25% of the EGR ratio. According to the flame structure based on numerical results, high temperatureregions for the FI-EGR method were narrower and lower than those for the AI-EGR method at the sameEGR ratio. Furthermore, based on the experimental results for swirl flames, the reduction rate of EINOx forthe FI-EGR method was approximately 49% with 15% of the EGR ratio, while the maximum reduction ratefor AI-EGR method was approximately 45% with 25% of the EGR ratio. Consequently, we verified that theFI-EGR method was more effective than the AI-EGR method in reducing NOx emission for non-premixedflames with EGR. We expect that the results of this study will provide fundamental information relating tohybrid combustion systems, which can be used in the design of combustion systems in the future.
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