지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 발행연도
- 2013
- 저작권
- 경상대학교 논문은 저작권에 의해 보호받습니다.
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Maximizing the deNOx performance and minimizing NH3 slip during the boiler load changes is one of the main challenges for the ship and industry application of selective catalytic reduction (SCR) systems with optimization of urea spray characteristics. In order to increase the NOx conversion efficiency and to decrease the NH3 slip, the exhaust gases should be well mixed with the aqueous urea solution.
In the present study, a three-dimensional modeling have examined the effects of spray angle and number of injector holes on the uniformity of ammonia concentration distribution at the entrance of zeolite-based catalyst as well as the maximum ammonia conversion efficiency by the SIMPLE algorithm using computational fluid dynamics.
The result shows that the atomization efficiency of the axial direction injection generated from one- and two-hole urea injectors decreased compare to the multi-hole urea injector because the urea droplets concentrated on the region of exhaust gas inlet and also do not spread evenly. Hence, the four-hole injector with 90° spray angle has the most amount of ammonia conversion efficiency at the entrance of zeolite-based catalyst and shows a better atomization and evaporation of urea droplets. This condition occurred because the urea droplets spread more uniformly and widely than those of other various spray angles.
In the present study, a three-dimensional modeling have examined the effects of spray angle and number of injector holes on the uniformity of ammonia concentration distribution at the entrance of zeolite-based catalyst as well as the maximum ammonia conversion efficiency by the SIMPLE algorithm using computational fluid dynamics.
The result shows that the atomization efficiency of the axial direction injection generated from one- and two-hole urea injectors decreased compare to the multi-hole urea injector because the urea droplets concentrated on the region of exhaust gas inlet and also do not spread evenly. Hence, the four-hole injector with 90° spray angle has the most amount of ammonia conversion efficiency at the entrance of zeolite-based catalyst and shows a better atomization and evaporation of urea droplets. This condition occurred because the urea droplets spread more uniformly and widely than those of other various spray angles.
목차
I. Introduction 21II. Literature Review 29III. Numerical Analyses 35IV. Results and Discussion 50V. Conclusions 63References 66
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