Air-fuel ratio adjusting method based on heating furnace mixed gas calorific value fluctuation

An air-fuel ratio adjusting method based on heating furnace mixed gas calorific value fluctuation solves the problem that the heating furnace mixed gas calorific value fluctuation greatly affects the heating furnace load and the atmosphere in the furnace. According to the air-fuel ratio adjusting method, real-time operation parameters of a heating furnace are obtained, and the combustible component proportion of each single coal gas is obtained through initial coal gas component detection; according to different unit calorific value oxygen consumptions of different combustible components, combining heat balance calculation and flue gas component analysis to obtain an actual combustible gas component proportion of the mixed gas under the current calorific value; by recording the historical relationship between the coal gas combustible component proportion and the coal gas calorific value, theoretical air quantity calculation under the corresponding calorific value is guided by using the component proportion, s