Damper Venturi

FW includes a venturi damper upgrade on most TLN retrofits. This upgrade, available for either existing or new damper systems, re-establishes windbox differential pressure control over the load range, lost due to the addition of overfire air. It also insures that dampers operate in a controllable range. Another application is older tangential fired units. They tend to lose some windbox differential pressure control due to increasing furnace in-leakage or other increased differential pressure requirements. Venturi damper inserts help re-establish this control. The upgrade consists of installing venturi plates around existing damper blades or with new windbox dampers. It is an aerodynamic solution to increase the damper to nozzle tip flow ratio, providing improved air flow control and increased windbox to furnace differential control over a greater load range.