1. Suspended solids standard: When the raw water of boiler feed water comes from surface water, depending on the amount of suspended solids and colloid in water, coagulation, sedimentation and filtration techniques can be selected; when raw water is groundwater, generally only need to be filtered, of which iron When the content is high, increase the manganese sand filter to remove iron.
2. Hardness standard: It is mainly to prevent or control scaling. There are many ways to remove hardness. There are lime softening method, chemical exchange softening, etc., but the most common and best treatment method is ion exchange softening method, newer method. It is a sodium filter method.
3. Dissolved solids standard: When the salt content of the pot water reaches a certain limit value, steam and water will be produced together, resulting in a sharp deterioration of steam quality. Many industries that require high water quality, such as the electronics industry and thermal power plants with high-pressure boiler
s, have stricter requirements for dissolved solids in water. The method for reducing the dissolved solid matter is generally referred to as desalting, and the main methods are: ion exchange method, electrodialysis method, reverse osmosis method, etc., the conventional process mostly adopts the ion exchange method, and the updated method is the reverse osmosis membrane method.