BLAST FURNACE AIR HEATER HEATING METHOD Russian patent published in 2016 - IPC C21B9/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly to a method of heating blast furnace stove. Method comprises combusting fuel with a lower heating value (LHV) of 9 MJ/Nm³ or less in a combustion region located in a combustion chamber in stove, in which there is maintained a stable, visible flame, and causing combustion gases to flow through and thereby heat refractory material in stove.

EFFECT: fuel is combusted with an oxidant comprising at least 85 % oxygen, and wherein combustion gases are caused to be recirculated into combustion region thereby diluting mixture of fuel and oxidant therein sufficiently for flame not to damage refractory material.

14 cl, 9 dwg, 4 tbl, 1 ex