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The Vortex Series/Split Flame Low NOx Burner is the successor to the Foster Wheeler Controlled Flow / Split Flame and Series Low NOx burners. Hundreds of the Vortex Series low NOx burners are in operation world wide, supporting the production of thousands of megawatts of power plant capacity. Depending on the unit and coal, NOx reduction levels of 65% from uncontrolled levels have been achieved using Vortex Series and Overfire Air. Compared to other commercially available designs, the Vortex Series Low NOx burner offers many unique advantages in swirl and air flow control for achieving lower NOx emissions. |
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Most commercially-available burner registers generate swirl from an array of adjustable blades in the burner air paths. For synchronous movement, these blades must be attached to complex linkages that have a tendency to bind and break. When this occurs flame stability deteriorates and NOx and unburned carbon increase until the next outage opportunity for repair. Simply due to its one piece design, the Vortex Series Swirler provides a much higher level of operational reliability, ensuring long term emission control. |
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Vortex Register The Foster Wheeler dual zone Vortex Series Register produces high swirl capability and air flow distribution control with just three moving parts. The fixed axial swirl generator produces a vortex air flow pattern with strong inward recirculation around the coal jet. A sectioned sketch of the Vortex Series Burner and Register is shown to the right. |
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Split Flame Tip The Foster Wheeler's newest Split Flame Coal Nozzle tip design still provides fuel staged NOx reduction but now with higher long term reliability that compliments the Vortex Series register. Among the numerous performance and reliability improvements is a design that exposes more of the coal stream to radiation. This promotes early ignition and devolatization in the absence of excess air to control early NOx generation. In addition, by segregating the coal into multiple concentrated streams a fuel staging effect is produced that controls formation of intermediate NOx. For applications where a wider range of fuels are fired an adjustable tip is provided in the inner sleeve of each coal nozzle. This one piece design allows velocity to be optimized without having to change primary airflow. Optimum position is determined during burner testing by monitoring flue gas NOx, CO emissions and coal flame conditions. As an option, the sliding tips can be fitted with a drive for remote control to compliment real time coal velocity monitoring and/or smart combustion control systems. All Foster Wheeler Vortex Low NOx burner systems can also be fitted with overfire air systems for additional NOx reduction. | |
