The invention belongs to the technical field of iron and steel
smelting, and particularly discloses a method for producing
pellets by using
blast furnace gas and converter gas in a grate-
rotary kiln, which comprises the following steps: starting a
combustion fan, closing a main valve of a fan
air door, igniting by using an ignition gun, feeding to the lower part of a
kiln head burner, opening a valve of
natural gas, and starting a
combustion furnace; a main
air door valve of a
combustion fan is gradually opened, meanwhile, the
valve opening degree of
rotational flow air and the
valve opening degree of direct flow air are adjusted to be 70% and 30% respectively, when the
kiln tail temperature reaches 800 DEG C, a converter gas valve is opened, the
valve opening degree of the converter gas valve is 10%, and when the
kiln tail temperature reaches 900 DEG C, a
blast furnace gas valve is opened, the valve opening degree of the
blast furnace gas valve is 20%, and the valve opening degree of the
blast furnace gas valve is 20%; and when the temperature of the kiln
tail reaches 950-980 DEG C,
material distribution is started, and production is carried out. In order to solve the problem of high production cost caused by the fact that
natural gas needs to be purchased as fuel to roast
pellets at present, the pellet production is carried out in a
blast furnace gas and converter gas co-combustion mode, so that the production cost is reduced.