High wind temperature obtaining method using pure blast furnace gas combustion

A method for obtaining high blast temperature by burning pure blast furnace gas is characterized in that a floor type furnace construction ball type hot blast furnace(11) is employed, first preheating for the combustion air K and coal gas M used for the hot blast furnace by the heat pipe exchangers (4) (5) using the hot blast furnace flue gas Y is completed, the front-mounted furnace(2) burns by using the first preheated partial mixed gas to make the gas temperature reach 900íµí½1000íµ,second preheating for the combustion air K by using the mixture of the hot blast furnace flue gas Y and the first preheated gas is carried out, through a high temperature heat exchanger(3),the temperature of the combustion air can reach 350íµí½400íµ, the combustion air is delivered to the burner port (19) of the hot blast furnace and mixed with the preheated pure coal gas and taken into a combustion chamber(18) for burning, the flue gas with the temperature of between 1300C. and 1350 C. is obtained, the high temperature coal gas passes the multi-stage ball-bed regenerators (12)í½(15) composed of the fireproof balls with the diameter of from 40mm to 80mm, flows down for exchanging the heat, and enters the flue gas exit port(21) and is put together in the main flue duct through a spherical cap grate(15) and an air current hypodispersion device(16), and flue gas is discharged after the remaining heat is used. The cold air A enters the cold-blast inlet 21 through a tee fitting for adjusting the temperature of the hot blast H in a range of between 1200 C. and 1250 C. by heat exchange with the ball bed.