Boiler water standard

According to the characteristics of the boiler structure and the requirements of operating parameters, determining reasonable standards for boiler feed water and boiler water quality is the main measure to prevent boiler scaling and corrosion and ensure steam quality, which is of great significance for ensuring the operation of the boiler. Promulgated by the stateGB1576－85The "Water Quality Standard for Low-Pressure Boilers" serves as the guideline and basis for boiler water treatment work.

Water treatment plan for boiler feed water

1Solutions for softened water or softened and dealkalized water

(1Sodium ion exchange softening method

 Pre-treatment→Sodium-type strongly acidic cation exchange→Thermal deaeration

Advantage: Ensures the residual hardness of water0.03mmo1/LHowever, it cannot reduce the alkalinity of water and can be used as feed water for low-pressure boilers.

(2Sodium ion exchange softening and dealkalization method

     Pre-treatment→Hydrogen-type cation exchange→Sodium-type strongly acidic cation exchange→Thermal deaeration

Advantages: It can both reduce the hardness of water and lower its alkalinity.

2Water treatment plan for demineralized water

(1Composite ion exchange desalination

     Pre-treatment→Strong acid cation exchanger→Carbon dioxide remover→Sodium-type strongly acidic cation exchange→Thermal deaeration

     Generally, the conductivity of the effluent can be less than10μs/cmIt is generally used as make-up water for medium and low pressure boilers.

Advantages: Low one-time investment cost. Disadvantages: During operation, a large amount of acid and alkali regenerant is consumed, resulting in increased costs, and it is prone to cause environmental pollution.

(2Reverse osmosis desalination

     Raw water→Multi-media mechanical filter→Activated carbon filter→Security filter→Reverse osmosis device→Thermal deaeration

The desalination rate can reach98%That's all. Used for low and medium pressure boilers. Advantages: It can remove various impurities from water, does not use acid or alkali regenerants during operation, has low operating costs and does not cause pollution to the environment, is easy to achieve automatic control, and reduces labor intensity. Disadvantage: The one-time investment is relatively high.

(3"Double bed (or reverse osmosis+Mixed bed desalinated raw water→Multi-media mechanical filter→Activated carbon filter→Security filter→Reverse osmosis or mixed bed→Mixed bed→Thermal deaeration

The salt in the water is nearly removed and is used in medium and high-pressure boilers. Especially when reverse osmosis equipment is selected for pre-desalination before the mixed bed, it can greatly extend the operation cycle of the mixed bed. Moreover, since the reverse osmosis equipment has already removed various impurities in the water, it protects the mixed bed resin and increases its service life.