A METHOD OF HEATING FOR BLAST FURNACE STOVES ADAPTED TO ACHIEVE HIGHER HOT BLAST TEMPERATURE (HBT)

摘要

The invention relates to a method of heating for blast furnace stoves adapted to achieve higher hot blast temperature, by deploying preferably more number of stoves on gas than on blast results in increased gas input into the stoves, higher hot blast temperature (HBT) and combustion raceway adiabatic flame temperature (RAFT). Advantageously, higher HBT or higher heat input through tuyeres decreases the heat requirement put into the furnace in the form of coke or auxiliary fuels. By putting three stoves on gas and one stove on blast, the total BF gas input into the stoves increases significantly resulting in higher HBT upto 1150�C. The higher HBT favours injection of coal dust with lower energy cost for production of hot metal. A rise of 10�C in blast temperature increases the combustion raceway temperature by 8.4�C and decreases coke rate by 1.23 kg/ton hot metal (thm), blast volume by 5.65 Nm3/thm and top gas volume (800Kcal/Nm3 basis) by 4.04 Nm3/thm. The method is capable of wide application with significant cost advantage and energy saving, extending stove life and improving BF productivity.[IN-KOL-2010-00061A]