Thermodynamics

Introducing too much air before combustion (an excess air coefficient greater than 1) increases heat loss and reduces thermal efficiency； Insufficient air mixing (an excess air coefficient of less than 1) also deteriorates combustion, leading to environmental pollution and energy waste. To this end, it is necessary to calculate the excess air coefficient during operation based on the components in the flue gas sample. During boiler operation, the actual air consumption is always greater than the theoretical air requirement. The ratio of the two is called the excess air coefficient. For the boiler furnace, the air excess factor used in flue gas calculations is related to the type of combustion equipment and the type of fuel. The excess air coefficient for bituminous coal in commonly used conventional chain grate boilers is 1.3 ； For oil and gas furnaces, it is 1.1, while for fluidized bed furnaces it is 1.1~1.2