Control the phosphate content of furnace water and the pH value of furnace water
The phosphate of boiler furnace water should be controlled between 5-15, because the phosphate is lower than 5, can not play the role of scale prevention, the phosphate is higher than 15, which will affect the PH value, so the phosphate content in the furnace water and the pH value of the furnace water should be controlled.
The phosphate root content in the furnace water should not be too high. If it is too high, not only will the amount of drugs discharged increase, but also cause the following adverse consequences:
1.Increase the salt content of the furnace water, thus affecting the quality of the steam.
2. It is possible to generate Mg3 (P04) 2 into the furnace with the feed water. Easy to remove with the discharge of furnace water. However, when the content of PO in the furnace water is too high, because the solubility of Mg3 (P04) 2 in high temperature water is very small, Mg2 + will form Mg3 (P04) 2 with P03-, which is easy to adhere to the boiler pipe to form secondary scale.
3. If the boiler water iron content is large, it is possible to generate iron phosphate scale.
4. The phenomenon of "temporary disappearance" of N ￡ L3P04 salt is easy to occur in high pressure or ultra-high pressure boilers.
Why should the pH value of the furnace water be controlled?
In the case of normal operation of the boiler, the pH value of the furnace water is usually controlled between 9 and 11, and either too high or too low has an impact on the boiler corrosion.
1.At low pH values (pH <9), the water corrupts the steel faster because H + is depolarized. And at this time the corrosion products are soluble, not easy to generate protective film.
2. The reaction of PO3-with cf and + in furnace water is only high enough pH value to generate the impurities easily eliminated by sewage discharge.
3. Maintaining the appropriate pH value in furnace water is also conducive to inhibiting the hydrolysis of silicate in furnace water and reducing the soluble carrying capacity of silicic acid in steam (especially high-pressure steam).
4. When the furnace water pH value is too high, such as pH> 13, it is not only easy to cause alkaline corrosion, but also may make the furnace water produce foam and affect the steam quality.
The above is a detailed description of the phosphate content in the furnace water and the pH value of the furnace water. If you need to understand the professional boiler water phosphate water quality detector and supporting reagents produced by Erun, you can directly contact the customer service team, and the customer service team of Erun environmental protection can serve you at any time.
