Question 422Steam Plants - Assistant Engineer70% to pass
Dissolved oxygen can be removed from the boiler water by _______________.
AI Explanation
The correct answer is A) treating the water with chemical scavengers.
Dissolved oxygen in boiler water can lead to corrosion and pitting of the boiler metal. To remove dissolved oxygen, chemical scavengers such as hydrazine or sodium sulfite are added to the boiler water. These chemicals react with and remove the dissolved oxygen, preventing the corrosive effects.
The other options are incorrect because: B) dumping and refilling the boiler weekly would not effectively remove dissolved oxygen, C) passing the water through absorbent filters would not chemically react with and remove the dissolved oxygen, and D) frequent surface and bottom blows would primarily remove sediment and impurities, not dissolved oxygen.
Related Questions
#420 Proper use of the boiler surface blow will _______________.#421 Before giving a boiler a bottom blow, it should be taken off the line and then the _______________.#423 Which of the listed methods can be used to blow down a boiler without securing the fires? #424 A unit of measure used to express the chloride content of boiler water is _______________.#425 Treatment of boiler feed water for the control of hardness is necessary to prevent _______________.