The acid dew point of flue gas is an important factor that restricts deep waste heat recovery technology.Accurate prediction of this value is of great significance for avoiding low temperature corrosion

reducing heat loss of flue gas and improving boiler efficiency. Based on the analysis and comparison of common calculation formulas of acid dew point

the least square method is used to fit the relevant experimental data to obtain the fitted formula

which is analyzed through theoretical calculation and field measurement data of relevant scholars in recent years. The calculation results of the formula proposed in this paper are verified by using self-designed measurement device of acid dew point. The result shows that the formula proposed in this paper not only has a more reasonable range of numerical prediction

but also has higher accuracy than others when the volume fraction of SO3 is below 20 mL/m3.