Experimental analysis of swirl number and nozzle design for scale-up of partially cracked ammonia flames - Data

Due to its ease of storage and existing global distribution network, interest in the use of renewably produced ammonia for decarbonising energy systems is growing. Partially cracking ammonia can overcome the flame stability challenges of this fuel, but demonstrations of high-power ammonia-based swirl flames with acceptable emissions have yet to be realised. Therefore, the present study examines the effects of varying swirl number and nozzle design on the static stability and emissions from 20% (vol.) cracked ammonia swirl flames for a wide range of equivalence ratios (0.3 < Φ < 2.2) and thermal powers of 5, 10 and 15kW. Additionally, a reference case of 100kW thermal power at stoichiometric conditions was tested.

The emissions data of NO, NO₂, N₂O and NH₃ (units: ppmv, dry 15% O₂) for the four cases examined at a range of equivalence ratios (units: a.u.) are available in a .xlsx file. The format of this data has equivalence ratio in column B, with the corresponding mean emissions values of the four cases in columns C, D, E and F. Rows 4 to 13 cover NO emissions, rows 16 to 25 cover NO2 emissions, rows 28 to 37 cover N2O emissions and rows 40-49 cover NH3 emissions. Column H repeats the same data as column B (equivalence ratio) and columns I to L show the corresponding error bar values in each direction for the mean emissions values in columns C to F.