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Foster Wheeler has extensive experience with overfire air (OFA) systems on tangential boilers, arch and wall fired furnaces. Hundreds of coal fired boilers, and many firing oil and gas, have been either designed with a Foster Wheeler OFA system or were retrofitted later by Foster Wheeler. Overfire is one of the single most cost effective ways to reduce NOx in an uncontrolled furnace. It is applicable to any firing system and all fossil fuels. Overfire Air is commonly used to compliment NOx reductions beyond those provided by Low NOx Burners alone. |
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| Overfire air systems are designed and sized to deliver the appropriate amount of total combustion air required to achieve NOx and combustion efficiency goals, with the amount depending on the unit, firing system and coals being fired. Special attention is paid to resizing the burners, locating the OFA ports, their quantity and size, along with assuring correct sizing of OFA ducts to achieve optimal NOx and CO performance. | |
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Please contact Foster Wheeler representative for more information. | |
