Internal Data Search by Process
Substantial NOx reductions with Ovation combustion optimization at Midwest coal plant
Emerson and a Midwest Power plant benchmarked pre-project NOX, O2, and steam temperature levels and burner tilt performance. Two improvements were identified, the addition of separated OverFire air (SOFA)dampers & tilts and combustion optimization in the plant’s Ovation control system. The OverFire air process redistributes air within the boiler combustion zone and injects additional air above the combustion zone to complete the combustion process. Decreasing the air within the burner zone lowers stoichiometry, which lowers the flame temperature and reduces thermal NOX. This also reduces the tendency of fuel-bound nitrogen to oxidize to nitrous oxides. To compensate for temperature excursions caused by rapid changes in SOFA positions, advanced control strategies were developed. These control strategies were based on an advanced non-linear, fuzzy-neural NARMAX (FNM) algorithm. The team followed a multi-step process, which included a study of the current combustion process, DCS control improvements, parametric testing, model development, open-loop testing, closed-loop testing, and commissioning. For this project’s optimization model NOX and CO were the control variables. Manipulated variables included the OFA and SOFA dampers, SOFA tilts, O2 trim, auxiliary air dampers, window-to-furnace differential pressure, fuel air dampers, and feeders. The disturbance variables included load, ambient temperature, total air flow, and burner tilts demand. Over the multi-year process that included the combustion optimization, followed by the SOFA equipment, followed by the advanced control optimization of the SOFA equipment, the plant reduced annual NOX output from over 1400 tons to under 600 tons.
Revision Date: 8/11/2016
Tags: Emerson Electric, Optimization, NOx Emissions Reduction
Fuel Tech has large SNCR systems in China
Fuel Tech has units in Asia which are large e.g 4 x 680 MW and are achieving up to 78% NOx removal with a combination of SNCR and combustion modifications. These additional power points supplement the information provided by Dale Pfaf in sessions 1 & 2. AES Greenridge is 115 MW T -Fired and achieves 60% NOx reduction with combustion modifications, SNCR and ASCR
Revision Date: 8/1/2016
Tags: 221112 - Fossil Fuel 化石燃料, Fuel Tech, NOx, SNCR, Emissions Control, NOx Emissions Reduction, China
BART cost effectiveness data for Hunter and Huntington plants
This data provides instructions on accessing PacifiCorp NOx control information in the Mcilvaine Utility Plans and Power Plant Air Quality Decisions systems. It also provides extracts from the July 5 EPA Approval/Disapproval of the regional haze program for PacifiCorp. Details on cost and emissions of the alternatives for 4 units are provided.
Revision Date: 7/12/2016
Tags: PacifiCorp, NOx, SNCR, SCR, Regulation, DeNOx Options, NOx Emissions Reduction, Overfire Air
Regional haze ruling for PacifiCorp
This July 5 2016 Federal Register document partially approves and disapproves the original Utah plan. It rules that the BART alternative submitted in the Utah plan is not acceptable relative to NOx emissions at 4 units located at the Hunter and Huntington plants in Utah.
Revision Date: 7/12/2016
Tags: SCR, NOx, SNCR, Regulation, DeNOx Options, NOx Emissions Reduction, Overfire Air
2015 operating data for Pacific Corp, Hunter and Huntington plants.
The linked file includes boiler and emissions data which is relevant for decisions to be made by the corporation to meet the regional haze rules The data includes 5 boilers but only units 1 and 2 at each plant are under review for NOx upgrades. Note that the links to each subfile are displayed at the bottom of the screen.
Revision Date: 7/12/2016
Tags: Pacificorp, SNCR, SCR, NOx, Regulation, DeNOx Options, NOx Emissions Reduction, DeNOx, Overfire Air