The effect of EGR ratio on a spray combustion and emission[Exhaust Gas Recirculation]
It was widely known that preheating of primary air and EGR were effective to reduce NOx emission in a combustion system. Then the authors proposed the effective system of the external EGR for a spray combustion system such as a gas turbine combustor. In this paper, they tried to obtain various combustion characteristic related to the EGR effect. The EFR ratio was defined by the O{sub 2} concentrations of the EGR gas and the total inlet gas to which EGR gas was added. The combustion characteristics at 0% to 20% of the EGR ratio were measured to investigate the effect of the external EGR. The total inlet gas was the mixture, in which a fresh air was mixed with a hot burned gas recirculated externally. The O{sub 2} concentration in the total inlet gas decreased from 21% to 19%. The temperature of the total inlet gas increased from room temperature to about 110 C. The results showed that the combustion characteristics were improved by the EGR. At a high level of the EGR ratio, hot EGR gas promoted to vaporize the kerosene spray. This kerosene vapor and combustion air formed a homogeneous mixture gas which stabilized high intensity flame. It resulted flame stabilization in wide range of the EGR. Flame which was filled up fully in the combustion chamber was non-luminous flame like a gaseous fuel combustion. Also, the level of NO concentration in the exhaust gas was reduced. IN the flame of high EGR ratio, hot spots which caused NO formation in the flame were highly reduced. And the residence time in the combustion chamber was also reduced, because of the average sectional velocity increased with an increase of the recirculating gas flow in the system. So the maximum values of NO concentration in the combustion chamber were reduced in all cases of experimental conditions with EGR. The level of NO concentration in the exhaust gas was suppressed to about 60% compared with no EGR combustion states.
- Research Organization:
- Gunma Univ. (JP)
- OSTI ID:
- 20013541
- Resource Relation:
- Conference: 1998 International Joint Power Generation Conference, Baltimore, MD (US), 08/23/1998--08/26/1998; Other Information: PBD: 1998; Related Information: In: Proceedings of the 1998 international joint power generation conference (FACT-Vol.22). Volume 1: Fuels and combustion technologies; Gas turbines; Environmental engineering; Nuclear engineering, by Gupta, A.; Natole, R.; Sanyal, A.; Veilleux, J. [eds.], 921 pages.
- Country of Publication:
- United States
- Language:
- English
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