| 摘要 |
PROBLEM TO BE SOLVED: To prevent erosion and corrosion in piping by eliminating a problem of alkali corrosion. SOLUTION: A prescribed quantity of ammonia is injected into supply water from a chemical injecting means 45, pH of the supply water of a low pressure drum 32 is set to 9.3, the ammonia concentration is set to 0.8 ppm, pH of the supply water of a medium pressure drum 22 is set to 9.5, the ammonia concentration is set to about 1.5 ppm, pH of the supply water of a high pressure drum 12 is set to 9.7, the ammonia concentration is set to about 2.9 ppm, and proper pH and the ammonia concentration are maintained so that the errosion and the corrosion in the piping can be prevented by eliminating the problem of the alkali corrosion.
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