Pressure filtration of raw water.
Softening by ion exchange.
Demineralized water by reverse osmosis.
98 % salts
Silicic acid (SiO4-)
Storage of the demineralized water.
Removal of gasses with a thermal deaerator.
Carbon dioxide (CO2)
Pump for dosing of chemicals to maintain boiler operation.
The water is heated to create high quality steam.
Condensed water is lead to the water tank (a). Steam for preheating is lead to the thermal deaerator (b).
Blowdown of steam boilers is necessary to comply with the specifications of the boiler suppliers as to the contents of salt (specific gravity) and the alkalinity (P-value) in the boiler water. The volume of blowdown is determined by the boiler type, operating pressure and water treatment quality of feed and makeup water.
In high quality boiler water, levels of suspended and total dissolved solids (TDS) are down to a minimum. This will minimize blowdown volume and hereby reduce energy loss, as the temperature of the blowdown liquid is the same as the steam generated in the boiler. Lower blowdown rate will also reduce makeup water and chemical use, saving you money and water.
Dissolved oxygen is highly corrosive and is one of the unwanted impurities to consider when choosing correct makeup water treatment for industrial steam boilers. Since softening and demineralization do not reduce the partial pressure of gases, the water will often be saturated with oxygen from the waterworks.
Alkalinity of the water is an essential factor when producing goods within food, beverage and textile industries and even more so in boiler operations. Through dealkalization the bicarbonate hardness is reduced, thus typically reducing the salt content in the water by approximately 75%.
Arla, the largest food company within dairy products in Denmark, has reduced their water waste by more than 75 % with the RO-PLUS technology from EUROWATER. Demineralized water is used as makeup water for steam boiler, laboratory use, and internal cooling on filling machine. The amount of water recovery also reduces their consumption of salt and energy and lower the operational cost.