General Electric Technology Gmbh

Jundong Zhang

Xinsheng Lou

Armand A Levasseur

Abhinaya Joshi

Bruce Wilhelm

Greg N Liljedahl

Shu Zhang

James A McCombe

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

An oxy-combustion boiler unit is disclosed which includes a furnace for combusting fuel and for emitting flue gas resulting from combustion. The furnace has first, second and third combustion zones, and an air separation unit for separating oxygen gas from air and providing a first portion of the separated oxygen to a first oxidant flow, a second portion to a second oxidant flow, and a third portion of the separated oxygen gas to the first, second, and third zones of the furnace. A controller can cause the separated oxygen gas to be distributed so that the first and second oxygen flows have a desired oxygen content, and so that the first, second, and third zones of the furnace receive a desired amount of oxygen based on a combustion zone stoichiometry control.

Oxy-fired boiler unit and method of operating the same

Growing community of inventors

Bloomfield, CT, United States of America

Jundong Zhang