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METHOD AND APPARATUS FOR REHEAT STEAM TEMPERATURE CONTROL OF OXY-FIRED BOILERS

United States Patent Application

20140216364
A1
View the Complete Application at the US Patent & Trademark Office
Method and system for adjusting a measured reheat outlet steam temperature ("R.sub.PV") to approximate a reheat outlet steam temperature setpoint ("R.sub.SP") in a boiler. An R.sub.PV is compared to an R.sub.SP. If the R.sub.PV is less than the R.sub.SP and a position of a fuel nozzle tilt ("TILT.sub.PV") is below a high limit of the fuel nozzle tilt ("TILT.sub.HIGH"), the TILT.sub.PV is increased while a flow rate of a secondary flue gas recirculation ("SFGR.sub.PV") is kept constant. If the R.sub.PV is less than the R.sub.SP and the TILT.sub.PV is at the TILT.sub.HIGH, the SFGR.sub.PV is increased. If the R.sub.PV is greater than the R.sub.SP and the SFGR.sub.PV is greater than a low limit of flow rate of the SFGR ("SFGR.sub.LOW"), the SFGR.sub.PV is decreased, while the TILT.sub.PV is kept constant. If the R.sub.PV is greater than the R.sub.SP and the SFGR.sub.PV is at the SFGR.sub.LOW, the TILT.sub.PV is decreased.
Lou, Xinsheng (West Hartford, CT), Zhang, Jundong (Bloomfield, CT), Zhang, Shu (Windsor Locks, CT), Liljedahl, Greg N. (Tariffville, CT), Wilhelm, Bruce W. (Enfield, CT)
ALSTOM TECHNOLOGY LTD (Baden CH)
13/ 759,151
February 5, 2013
GOVERNMENT LICENSE RIGHTS [0001] This invention was made with government support under Contract DE NT-0005290 awarded by the US Department of Energy. The government has certain rights the invention.