Natural circulation in steam boilers: driving mechanism
State how water circulation is produced in natural-circulation boilers during operation.
Choose the correct statement.
Difficulty: Easy
Correct Answer: By convection currents established by density differences when water is heated
Explanation:
Concept
In natural-circulation boilers, heating in the riser tubes reduces water density, producing convection currents between risers and downcomers that circulate water without any pump.
Why others are incorrect
No pump or draft fan circulates water in a natural system.
Injectors are for feeding water into the boiler, not for internal circulation.
Final Answer Circulation is by convection currents due to density differences.
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