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

Patent · 09 February 2021

OSTI ID:1805492

Lou, Xinsheng; Zhang, Jundong; Zhang, Shu; Liljedahl, Greg N.; Wilhelm, Bruce W.

Method and system for adjusting a measured reheat outlet steam temperature (“RPV”) to approximate a reheat outlet steam temperature setpoint (“RSP”) in a boiler. An RPV is compared to an RSP. If the RPV is less than the RSP and a position of a fuel nozzle tilt (“TILTPV”) is below a high limit of the fuel nozzle tilt (“TILTHIGH”), the TILTPV is increased while a flow rate of a secondary flue gas recirculation (“SFGRPV”) is kept constant. If the RPV is less than the RSP and the TILTPV is at the TILTHIGH, the SFGRPV is increased. If the RPV is greater than the RSP and the SFGRPV is greater than a low limit of flow rate of the SFGR (“SFGRLOW”), the SFGRPV is decreased, while the TILTPV is kept constant. If the RPV is greater than the RSP and the SFGRPV is at the SFGRLOW, the TILTPV is decreased.

• Research Organization: General Electric Technology GmbH, Baden (Switzerland)
• Sponsoring Organization: USDOE
• DOE Contract Number: NT0005290
• Assignee: General Electric Company (Baden, CH)
• Patent Number(s): 10,914,467
• Application Number: 13/759,151
• OSTI ID: 1805492
• Country of Publication: United States
• Language: English