Feedwater deoxidation for small waste heat boilers
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We have a small waste heat boiler with a rated evaporation capacity of 2 t/h and a steam pressure of 1.0 Mpa. The boiler feed water used in its design is open steam condensate, and no deoxygenation is carried out on this feed water. There is controversy regarding whether deoxygenation of the boiler feed water is necessary; one view is that thermal deoxygenation is needed to prevent corrosion caused by dissolved oxygen, while another opinion holds that although a deoxygenation device would be useful, it increases investment and operating costs. For such a small low-pressure boiler, it is not necessary to install a deoxygenation device – it is sufficient to add alkali to control the pH value of the boiler water. The question is, based on practical considerations, whether a deoxygenation device is indeed needed, and to what extent does it affect corrosion in the boiler?
Generally speaking, there is no need to install deoxygenation equipment for this type of small boiler you are using, as it involves high investment costs and high operating expenses. It is specified in the boiler codes. Small stoves like this (2T) are no longer required.