| 摘要 |
PROBLEM TO BE SOLVED: To easily reduce corrosion of a water supply system.SOLUTION: A boiler includes a water supply system 11 in which boiler water flows, ammonia addition equipment 12 for adding an ammonia solution to the boiler water, a pH measuring device 14 for measuring pH in the boiler water, and a control device 15. The control device 15 controls the ammonia addition equipment 12 so that pH of the boiler water is included in a pH range for preservation when the boiler water is heated, and controls the ammonia addition equipment 12 so that pH of the boiler water is included in the pH range for preservation, before flow of the boiler water in the water supply system 11 is stopped. Here, an arbitrary pH included in the pH range for preservation is larger than an arbitrary pH included in a pH range for operation. In this boiler, corrosion of the water supply system 11 can be easily prevented in comparison with a case where the water supply system 11 is filled with the boiler water for preservation including hydrazine.SELECTED DRAWING: Figure 2 |
