Enhanced ammonia combustion by partial pre-cracking strategy in a gas turbine model combustor: Flame macrostructures, lean blowout characteristics and exhaust emissions

• DOI: 10.1016/j.jaecs.2024.100247
• Publication Date: 2024-01-04T11:41:29Z
• Authors: Xiaoxiang Shi; Tianyou Lian; Yi Zhang; Zundi Liu; Wei Li; Zhongya Xi; Yuyang Li
• Keywords: Planar laser-induced fluorescence

Cofiring with hydrogen presents a reasonable approach to achieve enhanced ammonia (NH3) combustion without introducing an extra carbon footprint. A promising strategy for NH3/H2 cofiring in gas turbines involves on-site partial pre-cracking of NH3 and burns NH3/H2/N2 mixtures, eliminating additional transportation storage. This work investigates the effects ratio (γ) on flame macrostructures, lean blowout characteristics exhaust emissions partially pre-cracked flames single-swirl turbine model combustor. Flow macrostructures were captured using particle image velocimetry (PIV) OH planar laser-induced fluorescence (OH-PLIF) measurements. Lean limits (ϕLBO) assessed under varying γ, at burner outlet measured Fourier transform infrared spectroscopic (FTIR) analyzer. Results show that as γ increases, exhibits shortened height, strengthened fluorescence, amplified core jet velocities significantly reduced ϕLBO, indicating effective enhancement by strategy. Nevertheless, NO NO2 exhibit substantial increase larger γ. Opposite trends versus equivalence (ϕ) suggest trade-off between emissions, relatively low NO/NH3 window appearing slightly-rich (ϕ = 1.0–1.1) conditions. Low are also noted ultra-lean conditions =0.4–0.5) penalty high N2O making it unacceptable trade-off. Furthermore, effect N2 separation from mixtures was evaluated 0.4. The results deteriorating NOx resulting 13% 21% increases peak respectively, which implies more feasibility burn direct manner rather than separation.