Abstract
The combustion method has an important effect upon the efficieney of heating and melting operation, especially the practice of open hearth furnaces is seriously influenced by it.
Formerly the mixed combustion of low-pressure coke-oven-gas and liquid fuel had been used, and the authors, making research on a better combustion method, reached to the conclusion after some experiments that high-pressure coke-oven-gas flame would be more advantageous for melting operation, and this high-pressure coke-oven-gas combustion was put into practice.
The authors studied on the relation between flame length, temperature, pressure and a melting test with the high-pressure coke-oven-gas (about 1kg/cmcm2) in the model open hearth furnace.
The results obtained were as follows.
i) Actual velocity (Va) reached constant value at about 1kg/cmcm2 burner pressure.
ii) The higher the burner pressnre, the longer the flame length.
iii) Average flame temperature was corresponding to the burner pressure.
iv) At about 0.7kg/cmcm2 burner pressure, cutting effect becomes stronger.
v) Momentum flux was saturated with the 50mm φ burner at 4000Nm3/h.
