Method for determining first-time tapping time of blast furnace after regular-check air supply

The invention relates to a method for determining the first taphole opening time after blast furnace regular inspection air supply, which considers the relationship among the air volume after blast furnace regular inspection air supply, slag iron generation volume, hearth porosity and blast furnace safe slag iron storage volume, and deduces a method and a calculation formula for calculating the slag iron generation volume by the air volume after blast furnace regular inspection air supply. And establishing a regression equation between the cumulative air volume and the cumulative slag iron generation amount under different damping-down materials, determining the cumulative air volume when the iron is opened for the first time after blowing-in by using the blast furnace safe slag iron storage volume and the regression equation, and finally determining the time for opening the iron notch for the first time after regular checking blowing-in according to the cumulative air volume. By using the method, the tapping