【Overview】

Water use in the power industry are many, the most stringent water quality requirements of the boiler feed water, and now toward the high-capacity thermal power plant, the development of high parameters of the boiler is higher and higher quality of water, boiler feed water quality requirements Is very strict, so in addition to conventional coagulation, sedimentation, filtration and other treatment methods, the need to ion exchange, reverse osmosis, electrodialysis and other softening, desalination and other water preparation technology. The use of qualified supply of water, the boiler can be safe, economical, reliable and stable operation, and steam and hot water output of qualified premise.

 【Water Hazard】

Boiler feed water quality poor, it will lead to the formation of scale, the metal heating surface damage due to high temperature, reducing thermal efficiency and increase the number of chemical cleaning and boiler metal corrosion, and because the boiler is too high salt content in water to produce soft drinks caused azeotropic Steam quality deterioration.

1. Scale：water, calcium and magnesium salts, such as the boiler heating surface in the formation of scale, the scale of the thermal conductivity is much less than steel, scaling will seriously hamper the working fluid for heat transfer, reduce the thermal efficiency of boilers and To a dramatic rise in the temperature of heating surface, heating surface resulting in severe overheating or overheated pipe explosion bulge. Scaling of natural circulation boilers are also adversely affected。 It is estimated that 1 mm scale heating surface boiler efficiency will be reduced by 1% to 4%, the wall temperature close to Several hundred degrees。

 2. Corrosion: When water containing O2, CO2 and other gas impurities, the metal wall in contact with water can easily produce the electrochemical corrosion, the formation of severe ulcers or perforations, so that significantly reduce the carrying capacity of the structure may even lead to a boiler explosion.

3. Pollution Steam: damage to the superheater and steam equipment impurities in the water for a long time, with water entering the steam superheater, the water quickly evaporates, water impurities on the precipitation in the superheater fouling. Some impurities can be dissolved in water, steam, so that the steam quality decline, resulting in superheater steam equipment Shen Shen salt or salt, affect its safe operation.

Since the original impurities in the boiler above the water hazards, proper handling of the raw water can be used by the boiler feed water, the boiler as a heat carrier medium into the water. Sodium content of boiler water in the drum called the pot of water, also known as boiler water. As water evaporation in the boiler constantly, boiler water impurities than water. In addition, to prevent scaling and corrosion to the boiler operation when adding alkaline substances, thus making a pot of water is alkaline. Therefore, the pot of water and water have significant differences, the two have different water quality control requirements.