Prediction of Combustion Efficiency and NOx Levels for Diffusion Flame Combustors in HAT Cycles

Abstract

Diffusion flame combustor test results are presented for methane firing in steam/air mixtures containing up to 20% steam. The tests were conducted at atmospheric pressure with combustor inlet temperatures up to 700K. Steam and air were fully premixed before combustion. Combustion efficiency and NOX levels were measured. The well-known Θ loading parameter was modified by replacing the combustor inlet temperature with the flame temperature. The flame temperature was defined as the stoichiometric temperature of the steam/air mixture. The combustion efficiency obtained with and without steam correlated nicely with this modified loading parameter. Calculated NOX levels agreed well with the measurements, where NOX was predicted using the flamelet technique. This approach makes it possible to predict combustor efficiencies with steam by using combustor performance data taken without steam. Preliminary design analyses of gas turbine cycles with significant steam addition can now easily include the impact of the steam on combustor performance.

Semi-Empirical Mathematical Model of Nitrogen Oxides Emission From Low-Emission Combustion Chamber as a Part of Automatic Control System of an Aero Engine

“…В полуэмпирической модели генерации оксидов азота моделирование взаимодействия диффузионного и гомогенного факелов в камере сгорания ведется на основе принятой гипотезы возможности применения принципа суперпозиции [10][11][12]. Для описания процесса генерации окислов азота используется уравнение Зельдовича, позволяющее определить зависимость скорости реакции S NO от состава топливовоздушной смеси с помощью функции распределения плотности вероятности пульсаций концентрации топливовоздушной смеси в зависимости от величины интегрального эквивалентного отношения  , характеризующего концентрацию топлива в смеси.…”

Effects of steam addition and/or injection on the combustion characteristics: A review

“…The NOx reductions resulting from the first and second solutions were below 10 ppm and 14 ppm, respectively. In their experimental-numerical study, Belokon et al collected sufficient experimental data to study the performance of a compressor that was injected with highly humidified air [110]. The experimental results were instrumental in generating a diffusion flame combustor model with methane as fuel and a maximum steam-to-air ratio of 20%, which could be used for the estimation of combustion efficiency and the quantity of NOx emissions.…”

“…Approach I: The case study Industrial case [4,29,49,50,52,59,61,63,90,105,108,119] Lab test stand case [10,16,18,26,31,53,58,64,65,77,85,86,92,99,100,106,110,113,116,118] Gas turbine (power plant) [22, 29, 49, 50, 59-63, 65, 76, 90, 105, 107, 108, 113] Gas turbine (aircraft) [4,10,26,50,52,65] Diesel engine [30][31][32][33][34][35][36][37][38][39][40]…”