Explain how water circulation occurs between the upper and lower drum.
What will be an ideal response?
Circulation occurs due to density differences inside the tubes. Boiler water circulation operates under the principle of differential density. When fluid is heated, it expands and becomes less dense. Cooler water flows from the upper, or steam generating drum, through the downcomers to the mud drum (the lower drum) and then rises as steam is generated. Circulation continues, and makeup water is continually added to the upper drum to replace the steam that is generated.
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