Method for using blast furnace gas to heat of large-scale walking beam type plate blank heating furnace

The invention relates to a large-scale walking-beam type slab heating furnace which adopts a blast furnace gas heating method, and belongs to the technology field of a heating furnace. A plate blank steps from a furnace feeding end to a furnace discharging end through a walking beam, and passes through a preheating section, a first heating section, a second heating section, a third heating section and a soaking section; the heating temperature of each heating section is controlled according to the heating technology requirements of various steel grades; the quantity of stored-heat burners which are arranged in the corresponding heating sections is controlled; after the stored-heat burners are arranged in the position of each heating section, blast furnace gas and air respectively pass through refrigerating chambers of the stored-heat burners and are processed through thermal storage until the temperature reaches 800 to 1000 DEG C, and then enter the furnace for fully burning, thereby realizing the heating of the plate blank; when flue gas passes through the refrigerating chambers of the stored-heat burners, the heat of the flue gas is absorbed fully; the whole heating process is completed through alternate burning and exhaustsmoke of the stored-heat burners which are arranged on two sides of the heating furnace. The large-scale walking-beam type slab heating furnace has the advantages that the stored-heat heating technology is utilized to reduce the exhaust of NOx compound dusty gas greatly, and the energy-saving and environment-protecting effects are obvious.