ANTICORROSIVE DEVICE FOR THERMAL POWER PLANT

摘要

PURPOSE:To aim at the promotion of longevity in service life and improvements in efficiency, by injecting drain water out of a high pressure feed water heater into a deaerator, while feeding this drain water and the upstream side of a low pressure feed water heater with a water treater and thereby making a pH-value of the drain water higher than that of the feed water. CONSTITUTION:A water treater is injected in feed water at the upstream side of a low pressure feed water heater 8A from a water treater injector 20. In addition, a second water treater is injected into a drain pipe line 18C of a high pressure feed water heater 13C from a water treater injection pipe line 21. Thus, a pH-value in drain water is made higher than that in feed water flowing in each of high pressure feed water heaters 13A-13C. On the other hand, the pH-value in the feed water further goes down as being heated yet higher in temperature at a boiler 15, whereby at a condenser 2, it comes to such a degree of the pH-value that a copper system material is usable for a pipe group. Therefore, reduction in a corrosive product generated out of a heating pipe of the feed water heater or a drain pipe line is well promotable.