3, the pressurized water boiler water supply should be treated with water outside the pot. For hot water boilers and atmospheric hot water boilers with rated power less than or equal to 4.2MW non-pipe rack type pressure, the pot can be used for dosing, but it must be Boiler scaling, corrosion and water quality supervision, and do a good job in dosing, the water quality should meet the requirements of the following table. 1) Control the pH of the pot water to 10 to 12 by adding the medicine.
1) The basic unit of hardness mmol/L is c(1/2Ca2+, 1/2Mg2+), the same below.
2) The basic unit of alkalinity mmo1/L is c(OH-, 1/2CO2-3, HC03-), the same below.
For boilers that do not require high steam quality and do not have a superheater, the user's unit shall report the local boiler pressure vessel safety supervision agency's consent, and the upper limit of the alkalinity index may be appropriately relaxed.
3) When the rated evaporation of the boiler is greater than or equal to 6t/h, the boiler should be deaerated. If the boiler with the rated evaporation is less than 6t/h, if the local corrosion is found, the water supply should adopt oxygen removal measures. For the boiler feed water, the oxygen content of the boiler feed water. Should be less than or equal to 0.05mg / L.
4) If it is difficult to determine the dissolved solids, it can be indirectly controlled by measuring the conductivity or chloride ion (C1-), but the relationship between the dissolved solids and the conductivity or the ratio of chloride to Cl- should be tested according to the test. determine. The relationship should be retested and corrected periodically.
5) The relative alkalinity of the all-welded structure boiler may not be controlled.
6) Fuel and gas boiler only
2. Steam boilers and steam-water dual-purpose boilers with rated evaporation of less than or equal to 2t/h and rated steam pressure of 1.0MPa or less (such as no special requirements for steam and water quality) can also be treated with pots. However, it is necessary to supervise the scaling, corrosion and water quality of the boiler, and do a good job in dosing, sewage and cleaning. The water quality should meet the requirements of the following table.
2) The water supply of pressurized hot water boiler with rated power greater than or equal to 4.2MW should be deaerated. The water supply of pressurized hot water boiler and atmospheric hot water boiler with rated power less than 4.2MW should be deoxidized as much as possible.
4. The direct current (through-flow) boiler feed water should be treated with chemical water outside the boiler. The water quality is calculated according to the standard rated steam pressure in Table 1 being greater than 1.6Mpa and less than or equal to 2.5Mpa.
5. The water quality indicators of waste heat boilers and electric heating boilers should meet the requirements of boilers of the same type and parameters.
6. The water quality inspection method shall be carried out in accordance with Appendix A (Standard Appendix).