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NOx emission limits throughout the world are becoming more stringent (with impending limits in the 30-200 mg/Nm³ range). Coal-fired power plants are faced with choosing from an array of NOx control technologies in terms of NOx removal efficiency and cost to develop the optimal compliance strategy.
Instead of simply specifying and purchasing NOx reduction equipment, smart strategies employing complete solutions including the formation of NOx, tuning and optimization, ultimately result in the lowest cost approach to NOx reduction. This requires a thorough engineering analysis which often includes intelligent testing, Computational Fluid Dynamics (CFD) modeling, and development of strategies that best utilize a boiler’s geometry and existing equipment for the targeted fuel range.
In this informative webinar, Paul Kazalski, Combustion Engineer for Amec Foster Wheeler, will review key elements to NOx emission control alternatives for power plants. Topics presented will include:
- Focusing on preventing NOx formation in the first place through direct and indirect control methods
- Reducing NOx by improving fuel fineness using aggressive lift liners for ball mills or using dynamic classifiers
- Improving designs for tower distributors/riffle boxes and incorporating flow balancing valves for coal and air flow balancing
- Optimizing staging of direct NOx reduction methods – Combustion Controls, Low NOx Burners, Overfire Air, Windbox Modifications, and Fuel Distribution
- Addressing technology alternatives in terms of:
- Combustion control technologies versus post combustion methods (SNCR and SCR)
- High NOx Reduction vs. Cost
- Capital Costs vs. Operating Costs
- Phased Approach to NOx Removal
In addition, case studies where NOx control optimizations were conducted will be discussed. In the first case, the main windbox of a 450 MW wall-fired boiler in the US was modeled to evaluate the air flow distribution and modifications recommended based on the result.
A second project at a 520 MW power plant in the US will be discussed where CFD modeling was used to increase the quantity of overfire air flow and ultimately reduce NOx.
Attendees can ask questions which will be covered during the Q&A session of the webinar.
This webinar can help you make informed decisions about employing cost effective NOx compliance strategies for your specific boiler. Register today to secure your spot in this free webinar!
Paul Kazalski | Combustion Engineer | Amec Foster Wheeler Paul Kazalski has nearly ten years’ experience in coal-fired combustion and is responsible for designing the low-NOx Burners and Overfire Air System at AMEC Foster Wheeler. Additionally, Paul has experience as a field service agent for several utility power plants and has been engaged in many relevant R&D projects such as biomass combustion and CO2 capture. He received his Master’s degree in Chemical Engineering in 2008, and has been in the power industry ever since.