羽口溶損に関する実験的研究

抄録

Molten iron is poured on the upper side of test piece which section closely resembles to blast furnace tuyere section currently in use. The lower side is cooled by forced circulation of water passing the horizontal rectangular channel. Specimens are oxygen free high conductivity copper (OFHC), 99.7% cast copper, 99.97% aluminum, rolled brass plate, aluminum bronze, mild steel and titanium. A transitional phenomena until burnout were observed and the effect of principal factors on the burnout heat-flux has been investigated. The results obtained are as follows.
(1) In the case of OFHC, the burnout temperature of molten iron is higher as the velocity of cooling water is increased.
(2) The values of burnout heat-flux are larger as the velocity of cooling water is higher and under the same water velocity, burnout heat-flux values increase with the rise of subcooling temperature.
(3) In the case of OFHC, the influence of specimen wall thickness on the burnout heat-flux is negligible if the velocity of cooling water is high.
(4) Experimental equation obtained is as follows:
q_BO=A×ΔT_sub×V^0.45
A is constant with given material.
A=1.75×10³×λ^0.64+5.6×T_m-2.4×10³.
Where
λ: Thermal conductivity, kcal/m hr °C
T_m: Melting point, °C
ΔTsub: Subcooling temperature of cooling water, °C
V: Velocity of water, m/sec