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Which is the most recent economical method of power generation from boilers?

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Which is the most recent economical method of power generation from boilers?

(a) Natural circulation boiler

(b) Fire tube boiler

(c) Forced circulation

(d) Super critical boiler

The question was posed to me during an interview.

Question is taken from Types of High Pressure Boilers topic in section Steam Generators & Accessories of Energy Engineering

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The correct answer is (d) Super critical boiler

Easy explanation: Varying fuel costs have constantly persuaded power engineers to search for more economical methods of power generation. The most recent method is super critical boiler which operated at pressure of 3200 psi or 22 Mpa therefore facilitates in converting water into steam instantly.

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