Question

b) What methods are used to achieve low levels of corrosion by oxygen

in boiler feed water? What measurements are essential to ensure that

this is done satisfactorily, and what types of measurement could be

used?

Answer 1

• feed water to the boiler has to be purified to reduce the corrosion effects on the tubes inside the boiler. this can be done be the following methods.
• firstly, the raw water is treated with alum to remove the charged particles from the water.
• then, the water is sent to the cation exchanger where the catalyst zeolite removes the sodium and potassium ions from the water.
• sodium and potassium ions are impurities which will be deposited on the walls of the boiler.
• to reduce the corrosion levels, the water is treated with the phosphate based chemical which inhibit the effect of oxygen presence in the feed water.