What is the fuel range for pure Ammonia to air concentration?

The correct range for pure ammonia to air concentration is 15% - 28%. This concentration is critical in understanding the flammability and combustion characteristics of ammonia when mixed with air. Ammonia has a lower flammability limit (LFL) and an upper flammability limit (UFL) that define the concentration range in which it can ignite and sustain combustion.

At concentrations below 15%, there is not enough ammonia in the mix to support combustion, which is why it falls below the lower limit. On the other hand, concentrations above 28% are too rich for combustion to occur efficiently since there is not enough oxygen in relation to the ammonia to sustain a flame.

Understanding this range is essential for safety in environments where ammonia is used or stored, as it helps in assessing risks related to potential fires or explosions.