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What is the steam pressure limit of natural circulation boilers?

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What is the steam pressure limit of natural circulation boilers?

(a) 650bar

(b) 180bar

(c) 400bar

(d) 550bar

I had been asked this question in an international level competition.

The doubt is from Boiler Classification in section Steam Generators & Accessories of Energy Engineering

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Best answer
The correct choice is (b) 180bar

To elaborate: Water is purely circulated by density difference with most of the heat from the fuel flame being radiated to the water walls directly. The steam pressure of such boilers is limited to about 180bar, with water and steam being separated in the boiler drum.

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