1.When the boiler is started, if the boiler water is turbid, besides the valve of continuously blowdown shall be opened wider, the periodic draining shall be strengthened until the water quality turns better.
2.When the boiler operator thinks the water quality not to meet the boiler operation requirement.
3.During shutdown of continuously blowdown or short-time maintenance, it is possible to properly increase the times of periodic blowdown and the amount of blowdown.
4.According to the laboratory test report that the steam and water quality is poor, if the wider opening of the continuously draining valve is not effective, the periodic blowdown shall be strengthened.