Water quality is poor. When oxygen imperfect water into the heated water economizer easily emit oxygen attached to the inner surface of the tube, resulting in localized pitting corrosion or scaling. Porous structure of the product due to corrosion, does not prevent the intrusion of corrosive media, making the base metal corrosion continuing to develop corrosion growing. As the etching for the same time, corrosion products generated by the oxidation of the oxygen re-converted into iron oxide, which in turn can continue to react with the corrosive medium. (3) subject to corrosion in the economizer wall will further coking occurs, economizer tube-screen features are: able to withstand high pressure, are not afraid to produce water impact, not easy to plug fouling flue; however difficult to clean the coils , steel impatience corrosion, more stringent requirements on water quality, so the water must be softened and oxygen treatment. To prevent corrosion of pipe wall, requiring high water temperature than the flue gas dew point 5 ~ 10 ℃, water speed not less than 0.3 to 0.44 m / sec. Economizer tube-screen, can be made of boiling or bubbling. Both the structure is no different, only some differences in the pipe connection. Boiling economizer outlet and there is no valve between the steam drum so as to smoothly move the economizer steam generated in the steam into the drum, just before the economizer header population, with the valve accordingly. Whether boiling water or gas economizer, generally do not need to cut, it is generally not bypassed flue. Economizer tube panel made economizer boiling, the water temperature can be heated to a saturation temperature economizer, some water vapor evaporated into steam and this part of the total water vapor content of 10 to 15%, the highest up to 25% (evaporation of water vapor to the percentage of the total amount referred to boiling degrees or boiling rate). Current power plant using the 70t / h waste heat boiler, Tai'an City, Yamaguchi Wang Yun auxiliary boiler plant Contact: Hyun Manager Mobile: 15966036198 Tel :0538 -8606531 Fax :0538-8606531 E-mail: wangyunguolu@163.com Website: http: / / www.taswygl.com/ Address: Taiandaiyue District Kouzhen Ye Village