Theoretical and practical evidence of combustion: Changes in fuel composition, calorific value, and fuel quantity during the combustion process of industrial furnaces will lead to variations in air requirement. When the air consumption is excessively high (air excess), although the fuel can burn completely, a large amount of heat is carried away by the flue gas, resulting in a decrease in combustion temperature and an increase in nitrogen oxides. Additionally, the electrical consumption of blowers and exhaust fans will significantly rise.

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