Pulverized Coal Combustion in High Temperature Furnaces for the Steel Making : Second Report: Combustion Efficiency of Coal-oil Mixture and Pulverized Coal

概要

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The combustibility of a COM, a pulverized coal and a heavy oil was studied in high temperature furnaces for the steel making. Combustion efficiency was measured in a furnace with 1 m diameter and 4 m long tunnel, a thermal input of 40×10^4kcal/hr, a furnace temperature of 1300℃ and a combustion air temperature of 150-450℃. COM and pulverized coal combustion cause a rapid main reaction and a slow char reaction. The char reaction determines the burn-out point of the fuel. The efficiency of COM containing coal is as high as that of heavy oil. The efficiency of COM containing petroleum coke is lower, because coke combustion produces much char. The efficiency of coal is lower than that of other fuels by 20-50% in the main reaction, and ignition is delayed. An increase of the combustion air temperature and the velocity, and a raising of the fuel injection position promote the main reaction and improve the efficiency.
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