Abstract
The aim of the study was the assessment of corrosivity and aggressiveness for boiler feed water. The negative effects of water corrosivity and aggressiveness may include silting up of the steel water supply system and the destruction of boiler equipment touched or washed by such water. They may cause the whole industrial production system to fail or be destroyed. That is why it was important to reach a high water purification level, including the calculation of water aggressiveness and corrosivity indicators. The carried out test showed that the simple system used before the modernization of the industrial water treatment plant is not sufficient to reach clean and stable water. The authors proposed modernization, including additional processes to improve boiler water quality, and designed new devices for water treatment. As a result of the new idea, groundwater taken as raw water was treated in individual and complex processes, such as pre-aeration, filtration, ion exchange (cation and anion exchange resigns), extra aeration, and extra degassing. The conducted research included chemical analyses of raw and treated water. In the conducted studies, the indirect method of water aggressiveness and corrosivity assessment was applied using mathematical calculation of the Langelier Saturation Index (LSI), the Ryznar Stability Index (RI), the Larson–Skold Index (LI), and the Singley Index (SI). The results proved that the new proposed processes for the boiler feed water treatment station allow reaching a high water quality and low level of water aggressiveness and corrosion.
Highlights
Water used for domestic and industrial purposes should not have aggressive or corrosive features [1,2,3]
The research was conducted using water treatment experimental devices located in the technological side-line of the chosen industrial plant produced boiler feed water
Water quality at the studied water treatment plant changed during the time of its exploitation
Summary
Water used for domestic and industrial purposes should not have aggressive or corrosive features [1,2,3]. Corrosive water is capable of damaging many devices and equipment with which it comes into contact [4,5,6,7,8]. The corrosive effect of water on metals involves complex electrochemical and biochemical processes. None of the water components are inert to the metal and can accelerate or delay its corrosion. The destructive effect of water aggressiveness is described as an aggressive impact on concrete and a corrosive impact on metals, mainly iron and steel. Removal of aggressiveness and corrosivity of water as its stabilization is carried out by physical methods such as aeration or chemical methods [10,11]
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