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The combustion characteristic of 5㎿ class gas turbine engine with varying biogas concentration has been investigated at different engine operation regimes. The test was carried out in the gas turbine combustor test facility at Doosan Heavy Industries & Construction Co., Ltd. The results show that NOx emissions decreases with reduction in CH₄ concentration. However, CO emission results show the opposite trend compared with those of NOx emissions. In overall, the performance test result of the designed biogas combustor was considered successful satisfying the design targets.
An experimental investigation on the characteristics of nitrogen oxide emission from swirling was conducted using multi air staged combustor. The combustor utilizes swirler to dampen fuel/air mixing, allowing an extended residence time for fuel conversion chemistry in an locally fuel-rich environment prior to burnout. This process also allow to reduce thermal NOx formation to lessen the temperature of reaction zone.<br/> Parametric studies of ratios of each staged air were carried out the feasibility of fuel/air mixing for low NOx combustion. This study is validated to reduce NOx. suppressing to be supplied air in multi air staged combustion.
The Flame length of CH₄ with the Oxidizer of air and O₂ has been measured respectively for the nozzle diameter of 1.6㎜, 2.7㎜, 4.4㎜ and 7.7㎜. In all CH₄ flame on oxidizer of air and O₂, the flame length was independent of the initial jet diameter, dependent only on the flowrate in laminar flame regime, and in turbulent flame dependent on the initial jet diameter. Using correlation equation of Dellchatslos, the flame length has been expected exactly for CH₄/air flame, but has been underestimated for CH₄/O₂ flame. This paper has proposed correlation equation of CH₄/O₂ flame.
Effects of oxidizer inlet velocity on NO emission characteristics of 0.2㎿ oxy-fuel combustor have been experimentally investigated. The NO formation process in the oxy-fuel combustion is extremely sensitive even for the small fraction of nitrogen in oxidizer. By increasing the oxidizer velocity, flame length is reduced due to the enhanced turbulent mixing. The increased oxidizer velocity also results in the decreased flame temperature through the elevated entrainment rate of the recirculated product and the corresponding NO emission is drastically decreased. Experimental results clearly indicate that the entrained product gases play a crucial role to decrease the temperature at the flame zone and the post flame zone where the thermal NO is mainly formed.
$CO_2$ is a well-known green house gas as well as the major source of global warming. Many researchers have studied to reduce $CO_2$ emission in combustion processes. Among the method for reducing $CO_2$ emission, oxygen-enriched combustion has been proposed. Because its adiabatic flame temperature is relatively too high, existing facilities must be changed or the flame temperature in the combustion zone should be reduced. The combustion characteristics, composition in the flame zone, temperature profile and emission gases were investigated experimentally for the various oxygen-enriched ratios(OER) by the addition of $CO_2$, under constant $O_2$ flow rate. Results showed that the reaction zone was quenched and broadened as the addition of $CO_2$ was increased. The emission of NOx in flue gas was decreased as decreasing temperature in reaction zone. It was also shown that the reaction was delayed by the cooling effect. As the addition of $CO_2$ was increased, the composition of CO in the flame zone was increased due to the increase of reaction rate by increasing mixing effect of oxidant/fuel at OER=0%, but the composition of CO was decreased by quenching effect at OER=50% and 100%.