Chemical treatment of water inside the boiler is usually essential and complements external treatment by taking care of any impurities entering the boiler with the feed water (hardness, oxygen, silica, etc.). In many cases external treatment of the water supply is not necessary and the water can be treated only by internal methods.
Internal Water Treatment - Chipkin Automation Systems
Methods of lime-soda softening. The older method of intermittent softening consists of mixing the chemicals with the water in a tank, allowing time for reaction and forming of sludge, and filtering and drawing off the clear water. Dissolved oxygen in water is a major cause of boiler system corrosion. It should be removed before the water is
Water Softening and Methods in Water Treatment Process. It is possible to reduce the hardness of water to zero. This is useful for softening of water to be used for boilers and certain textile industries. Disadvantages of zeolite process. Cannot be adopted for highly turbid . 3.Demineralization Process.
Simply raising the feed water temperature and giving the oxygen sufficient opportunity to escape, will significantly reduce the risk of oxygen corrosion. The feedtank temperature should be maintained at a minimum of 80°C. This should be achieved by returning as much hot condensate as possible and by steam injection.
Water temperature is important for oxygen removal. With this system, the temperature limitation is feed water pump cavitation. When the feed water pump activates, the boiling point of water is reduced Feed the oxygen scavenger to the water section of the tank using a stainless steel quill. Cold Makeup Condensate Heat Sparging Line
Oxygen can be reduced before entering the boiler by deaeration and chemical oxygen scavenging. However, as the solubility of Oxygen in water decreases with temperature, a very cost effective way of reducing the content of dissolved oxygen (and other gases) is increasing the temperature of the feed water