Why do boilers make-up water need to be filtered?
To do a good job in the purification and treatment of boiler make-up water in power plants can not only effectively prevent and reduce the accidents caused by boiler scaling, corrosion, and steam quality deterioration, but also promote the stable and reliable operation of the unit.
The quality of boiler water directly affects the quality of steam. At the same time, it determines whether the boiler can operate safely and the service life of the boiler.
Standardizing the treatment of boiler make-up water can not only effectively prevent and reduce the accidents caused by boiler scaling, corrosion, and steam quality deterioration, but also promote the safety, economy, energy-saving, and environmental protection of boiler operation.
The anti-corrosion problem of the boiler in the process of make-up water is related to the safe operation of the boiler, whether the boiler can give play to the relevant indicators and standards designed by the equipment manufacturer, and the operation cost and operation efficiency of the power plant.
If the boiler in the power plant is not treated properly in the process of make-up water, it is easy to produce corrosive chemicals in the inner body of the boiler, which will deposit or adhere to the boiler tube wall and heating surface, and then form refractory and heat conduction blocking iron scale, and corrosion will cause pitting in the inner wall of the boiler tube, leading to the increase of resistance coefficient, Pipeline corrosion to a certain extent, will produce pipeline explosion safety production accidents, cause unnecessary losses to the enterprise and national property, not only the power plant boiler make-up water needs to be purified, any industrial production and boiler water needs to be purified, the treated water meets the boiler water standard, which can not only ensure the product quality but also ensure the safe operation of the boiler.
Application of wedge wire screen filter
There are suspended solids, colloids, and other impurities in natural water. If they enter the boiler directly, it will cause boiler scaling. Boiler scaling is also the main cause of boiler tube explosion. Steam water co-evaporation affects the steam quality of the steam boiler, and the water quality is related to the operation and installation of the boiler. The purpose of boiler water treatment is to eliminate various problems of boiler water and ensure the safe operation of the boiler.
- Raw water pretreatment
When the raw water is surface water, the purpose of pretreatment is to remove suspended matter, colloidal matter, and organic matter. Sand and carbon filtration equipment are usually installed to filter into clean water.
Wedge wire filter is needed in quartz sand filter or activated carbon filter to retain filter medium and filter. - Boiler water softening treatment
The hard salt of calcium and magnesium in water is transformed into nonscaling salt by ion exchange resin to prevent the formation of calcium magnesium hard scale in the inner wall of the boiler pipe. For the water with calcium-magnesium bicarbonate and high alkalinity, the method of ion exchange of sodium hydrogen or pretreatment can be used to solve it.
Resin Trap Screen and Johnson Lateral Assemblies are needed in ion exchanger. - Boiler water desalination treatment
With the continuous improvement of boiler parameters and the emergence of the once-through boiler, it is even required to remove all the salt in the boiler feedwater, so the method of salt removal must be adopted. There are many kinds of ion exchangers used in chemical desalting, the most commonly used are cation exchange resin and anion exchange resin, referred to as “cation resin” and “anion resin”. In the ion exchanger, when the brine flows through the resin, the cations and anions in the salt are removed after being transformed with the cations (H +) and anions (OH -) in the resin respectively.
When the alkalinity of water is high, in order to reduce the burden of the anion exchanger and improve the economy of system operation, it is generally required to connect the decarbonator in series after cation exchanger to remove carbon dioxide. For water with high salt content, reverse osmosis or electrodialysis process can also be used to desalinate the water first, and then enter the ion exchanger for deep desalination. For a high-pressure boiler or once-through boiler, trace silicon in feed water must be removed; Medium and low-pressure boilers are treated according to the content.
Resin Trap Screen and Johnson Lateral Assemblies are needed in desalting equipment.