This paper presents the results of an experimental study on the combustion
process of methane mixed with ammonia (NH3) in flameless mode. At a time of
striving for CO2-free power, ammonia became a potential energy storage
carrier fuel from renewable sources. Flameless combustion features low
emissions and is a very efficient technology used in the power sector, as
well as steel production, ceramics, etc. Industrial furnaces were tested in
the context of pure methane combustion with an addition of ammonia, up to
5%. Flameless combustion conditions were achieved with a regenerative gas
burner system (High Regenerative System- HRS). The burner consists of four
ceramic regenerators allowing for continuous preheating of air, even up to
50K lower than the temperature of the combustion chamber wall. Constant
power of the introduced fuel was kept at 150kW and the fuel-air equivalence
ratio ranged from 0.75 to 0.95. The results have shown a growth of molar
fraction of nitric oxides in flue gases when ammonia content in the fuel
rose. The increase is more significant for the tests with a higher amount of
oxygen in the combustion chamber (a lower fuel-air equivalence ratio). An
addition of 5% of NH3 into the fuel caused an emission of nitric oxide at
the levels of 113 ppmv and 462 ppmv (calculated to O2 = 0%), respectively
for low and high fuel-air equivalence ratios. The calculated conversion
factor (CF) of NH3 to fuel nitric oxide has shown extremely low values,
equal to 2% (? = 0.95) and 8.4% (? = 0.75), which indeed confirmed that
ammonia can be burned with low emissions in flameless combustion technology.
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