| 摘要 |
PROBLEM TO BE SOLVED: To prevent a drop definitely in heat transfer efficiency and waste heat recovery efficiency applied to a steel material by detecting automatically dust deposited on a boiler heat transfer tube for a waste heat recovery boiler set up in a steel material heating furnace in an early stage and definitely and preventing drain water from being injected to the boiler heat transfer tube when staring a soot blower and preventing the dust from being condensed and fixed and holding constantly a draft force of a heating furnace stack and so forth. SOLUTION: An exhaust gas pressure loss (differential pressure on the inlet side)ΔP in a waste heat collection boiler 4 is measured with a measuring apparatus 11. When this waste gas pressure lossΔP exceeds a setting value, a soot blower 5 is arranged to start. When starting the soot blower 5, the steam of the soot blower 5 is injected for a definite time in the direction in which the steam is not injected to a boiler heat transfer tube 4a so that the water in the soot blower 5 and the piping may be purged. After the water is purged, the steam is injected toward the boiler heat transfer tube 4a.
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