What is the space-time air-fuel ratio for low-nitrogen gas combustion at 30 milligrams

The air to gas air-fuel ratio required for low nitrogen 30 combustion (i.e. nitrogen oxide emissions ≤ 30 mg/m ³):

Theoretical air-fuel ratio: The theoretical air-fuel ratio of natural gas (mainly composed of methane CH ₄) under ideal complete combustion conditions is about 9.52:1 (i.e. about 9.52 cubic meters of air are required per cubic meter of natural gas).

Actual operating air-fuel ratio: In order to achieve low nitrogen stable combustion and control NOx ≤ 30 mg/m ³, excess air slightly higher than the theoretical value is usually used. The actual air-fuel ratio is generally between 1.1 and 1.2 times the theoretical value, that is, the actual air-fuel ratio is approximately 10.5:1~11.4:1 (air: gas volume ratio).