General Electric Technology Gmbh

Alstom (switzerland) Ltd

Greg N Liljedahl

David K Anderson

Xinsheng Lou

Bruce Wilhelm

Shu Zhang

Jundong Zhang

John L Marion

Method and system for adjusting a measured reheat outlet steam temperature ('R') to approximate a reheat outlet steam temperature setpoint ('R') in a boiler. An Ris compared to an R. If the Ris less than the Rand a position of a fuel nozzle tilt (&#x201c;TILT&#x201d;) is below a high limit of the fuel nozzle tilt (&#x201c;TILT&#x201d;), the TILTis increased while a flow rate of a secondary flue gas recirculation (&#x201c;SFGR&#x201d;) is kept constant. If the Ris less than the Rand the TILTis at the TILT, the SFGRis increased. If the Ris greater than the Rand the SFGRis greater than a low limit of flow rate of the SFGR (&#x201c;SFGR&#x201d;), the SFGRis decreased, while the TILTis kept constant. If the Ris greater than the Rand the SFGRis at the SFGR, the TILTis decreased.

Method and apparatus for reheat steam temperature control of oxy-fired boilers

A circulating fluidized bed steam generator and a method for operating the circulating fluidized bed steam generator are provided which offer the flexibility to use carbon dioxide (CO ) both as a desirable end product and as support to the combustion process. The method includes the step of introducing a substantially pure oxygen feed stream into the circulating fluidized bed steam generator and the step of combusting a fuel in the presence of the substantially pure oxygen feed stream to produce a flue gas having carbon dioxide and water vapor as its two largest constituent elements by volume. The method also includes the step of passing the flue gas through an oxygen feed stream pre-heater at which heat from the flue gas is transferred to the oxygen feed stream. Furthermore, the method includes the step of separating the flue gas into an end product portion and a recycling portion. The method additionally includes cooling and compressing the end product portion of the flue gas so as to yield carbon dioxide in a liquid phase and directing the recycling portion of the flue gas to the circulating fluidized bed steam generator to contribute to the combustion process therein.

Oxygen fired circulating fluidized bed steam generator

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Tariffville, CT, United States of America

Greg N Liljedahl