Large blast furnace stewing method

The invention discloses a large blast furnace stewing method. The large blast furnace stewing method comprises the steps that (1) tuyere cokes are 5 t; and when the tuyere cokes reach a tuyere, the air stop furnace stewing is started; (2) the total quantity of additional cokes is calculated according to the furnace stewing time of 1.4 t/h; four parts of the tuyere, a soft melting strip lower edge,a soft melting strip upper edge and a block strip are included; the tuyere cokes are 5 t, and are in the position of the tuyere during air stop; the additional cokes on the soft melting strip lower edge is 50% of the rest total quantity of the additional cokes; and the additional cokes are on a furnace bosh upper edge and the soft melting strip lower edge during air stop; (3) air stop materials comprise that the coke burdening ratio is increased by 20 kg/t; the burdening is stopped to generate ores; high-silicon blocks are fed to maintain invariable sintered ore ratio; and the burdening alkality is reduced by 15%; an