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AssigneeBabcock & Wilcox Power Generation Group, Inc.
InventorsJeb W. Gayheart, Donald E. Ryan, Robert M. McNertney, Peter W. Waanders, Geza G. Csatlos
Estimating the term…
An economizer arrangement particularly suitable for new or retrofit application to existing steam generators provides a water cooled stringer support tube system which can accommodate firing a wide range of fuels with varying characteristics in the steam generator. The economizer arrangement according to the present invention is particularly suited for retrofit applications to large supercritical steam generators. The use of water cooled stringer tube supports allows for higher flue gas temperatures in comparison to conventional non-cooled mechanical economizer supports. These features are provided in a design which fits within the existing economizer envelope of the steam generator.
A method of modifying a pre-existing steam generator designed to burn a limited range of coals, a furnace for burning the coal and producing a flue gas, a convection pass for receiving the flue gas, heat transfer surfaces located downstream gas flow-wise of the furnace, the heat transfer surfaces including a mechanically-supported economizer located in the convection pass, the method comprising the steps of:
A pre-existing steam generator designed to burn a limited range of coals, a furnace for burning the coal and producing a flue gas, a convection pass for receiving the flue gas, heat transfer surfaces located downstream gas flow-wise of the furnace, the heat transfer surfaces including a mechanically-supported economizer located in the convection pass, and wherein the pre-existing steam generator is retrofitted to burn a wider range of coals, the retrofitting including the replacement of the existing mechanically-supported economizer with a water cooled stringer tube-supported economizer.
Dependencies are inferred from the claim text.