Application of Thermal Storage Combustion Technique to Modifi-cation of Large-sized Low Heat Value Coal Gas Heating Furnace

The rotary hearth furnace with 21 m middle diameter of the Φ170 mm pipe-rolling plant of Hubei Xinye Steel Corp.had failed to operate with the designed heating capacity,owing to the inappropriate configu-ration of the combustion system.The furnace had disadvantages of high energy consumption and so low heating capacity just as 35 t/h,which seriously restricted tapping the production capacity of the pipe plant.Thanks to the modification with the thermal storage combustion technique,the heating capacity of the furnace has been greatly enhanced up to 55 t/h,maximum 60 t/h.The actual operation practice shows that the modified furnace features uniform heating temperature,obvious energy-saving efficiency,completely elimination of the temperature-waiting time during the billet-heating process,having met the requirement for expanding the production capacity of the said pipe plant.