High temperature sub-critical boiler with steam cooled upper furnace and start-up methods

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United States of America Patent

PATENT NO 9920924
SERIAL NO

15091211

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A boiler is disclosed in which the furnace is divided into a lower furnace and an upper furnace. The lower furnace uses water-cooled membrane walls, while the upper furnace uses steam-cooled membrane walls that act as superheating surfaces. A steam-cooled circuit includes a steam separator, a primary superheater, and the steam-cooled membrane walls of the upper furnace. During start-up, a diversion path is opened that reduces dry steam flow through the primary superheater and increases dry steam flow through the steam-cooled membrane walls of the upper furnace. This protects the steam-cooled membrane walls from excessive thermal stresses during start-up.

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Patent Owner(s)

  • THE BABCOCK & WILCOX COMPANY

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bennett, Albert J Doylestown, US 6 3
Remus, Jeremy L Sugar Land, US 4 0
Wells, Eric L Massillon, US 7 7

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