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US 6,863,523 B2Granted
Crossflow air heater bypass
AssigneePPL Corporation
InventorPeter E. Giella
Life of this patent
Estimating the term…
Abstract
A boiler system includes combustion air conduit for directing the flow of combustion air through a first air heater (e.g., A-side heater) to a boiler and flue gas conduit for directing the flow of flue gas generated by the boiler to a second air heater (e.g., B-side heater). The combustion air conduit is configured to direct the majority of the combustion air to the first air heater, and the flue gas conduit is configured to direct the majority of the flue gas from the boiler to the second air heater.
Claims20
A system comprising:
- (a) a boiler configured to receive combustion air and to generate flue gas as a byproduct of burning fuel mixed with the combustion air;
- (b) combustion air conduit configured to direct the flow of the combustion air to the boiler;
- (c) flue gas conduit configured to direct the flow of the flue gas away from the boiler;
- (d) a first fan coupled to the boiler and configured to force combustion air through the combustion air conduit to the boiler;
- (e) a first air heater coupled to the first fan and to the boiler via the combustion air conduit and positioned along the combustion air conduit between the first fan and the boiler;
- and
- (f) a second air heater coupled to the boiler via the flue gas conduit, wherein the flue gas conduit is configured to direct more flue gas to the second air heater than to the first air heater.
4 more elements
A method comprising:
- (a) directing a flow of combustion air through a first air heater to a boiler;
- (b) directing a flow of flue gas generated by the boiler to a second air heater,
- (c) restricting the amount of combustion air received by the second air heater to cause the first air heater to receive the majority of the combustion air;
- and
- (d) restricting the amount of flue gas received by the first air heater from the boiler to cause the second air heater to receive the majority of the flue gas from the boiler.
2 more elements
A system comprising:
- (a) means for directing a flow of combustion air through a first air heater to a boiler;
- (b) means for directing a flow of flue gas generated by the boiler to a second air heater;
- (c) means for restricting the amount of combustion air received by the second air heater to cause the first air heater to receive the majority of the combustion air;
- and
- (d) means for restricting the amount of flue gas received by the first air heater from the boiler to cause the second air heater to receive the majority of the flue gas from the boiler.
2 more elements
Dependencies are inferred from the claim text.