The Application of ZonalTM Combustion Monitoring and Tuning System to Coal Boilers for Efficiency Improvement and Emissions Reduction
Coal-fired boilers equipped with Low NOx Burner (LNB) and Overfire Air (OFA) are challenged with maintaining good combustion conditions.In many cases,the significant increases in carbon monoxide (CO) and unburned carbon levels can be attributed to local poor combustion conditions as a result of poorly controlled fuel-air distribution within the furnace.The Zonal? combustion monitoring and tuning system developed by GE is available to detect and correct the furnace air-fuel distribution imbalance.The system monitors the boiler excess oxygen (O2) and combustible gases,primarily carbon monoxide (CO),by using spatially distributed multipoint sensors located in the boilers high temperature upper convective backpass region.At these locations,the furnace flow is still significantly stratified allowing tracing of poor combustion zones to specific burners and OFA ports.Using a model-based tuning system,operators can rapidly respond to poor combustion conditions by redistributing airflows to select burners and OFA ports. By improving combustion at every point within the furnace,the boiler can operate at reduced excess O2 and reduced furnace exit gas temperature (FEGT) while also reducing localized hot spots,corrosive gas conditions,slag formation,and carbon-in-ash.Benefits include improving efficiency,reducing NOX emissions,increasing output and maximizing availability.This paper presents the results from implementing the Zonal combustion monitoring and tuning system on a 460 MWe tangential-fired coal boiler in the Western United States.
Guang Xu Wei Zhou Neil C.Widmer David K.Moyeda
GE Energy,USA 18A Mason Irvine,CA 92618
国际会议
The 7th International Symposium on Coal Combustion(第七届国际煤燃烧学术会议)
哈尔滨
英文
238-241
2011-07-19（万方平台首次上网日期，不代表论文的发表时间）