PURPOSE: To efficiently and economically prevent or restrain the vaporization of cooling water in the cooling plate and to prevent the breakage of the cooling plate by beforehand detecting a sign of the vaporization in the cooling plate and taking the preventing measure to the breakage of the cooling plate only in the necessary cooling system.
CONSTITUTION: A part of the cooling plate 4 is exposed to the inside of the high temp. furnace 1 of a blast furnace caused by wearing of the furnace wall 11 and the temp. of the cooling water is raised. This condition can be confirmed by the sign phenomenon of the vaporization, by clouding phenomenon due to the generation of bubbles in the cooling water by visually checking the condition of drainage 5 in the cooling water for cooling plate. At the time of condirming this condition, immediately, e.g. a three-way valve 8 as directional change-over valve is manually operated, and a water supplying source is changed over into a high pressure water pipe 7 which has an original pressure higher than the pressure loss due to gas-liquid two phase flow in the cooling plate 4 and a supplying/draining water piping 3 system. By this method, the generation of the vaporization of the cooling water in cooling plate is prevented from happening or the vaporizing phenomenon after its occurring can be restrained and the breakage of the cooling plate can be prevented.
TAKAHASHI YASUHIRO
TAKAHASHI KIYOSHI
NIINUMA SHINICHI
