The furnace corners are designated as corner 1, 2, 3 and 4 in clockwise direction. The auxiliary air nozzles in between coal elevations are designated as elevations AB,BC,CD,DE,EF. The coal nozzle elevations are designated as A,B,C,D,E,F elevation from bottom to top, the bottom end air and top end air elevations as AA and FF respectively. Louvre dampers named as secondary air dampers each of which is operated by an individual damper drive cylinder located at the side of the wind box. of Coal nozzles and 5 auxiliary air nozzles alternatively at different elevations from top to bottom. The wind box assembly is a tall structure divided in its height into thirteen compartments which houses 6 no. The secondary air for combustion primarily enters into the windbox. The FD and ID fans develop enough draft to move the tremendous volume of air and gases through the flue gas ducts and stack to atmosphere maintaining a balanced draft in the furnace. In power plant boilers, the draft is obtained by means of fans namely Forced draft and Induced draft fan. Keywords- Secondary air dampers, Draft system, ARDUINO, Power plant (TTPS), Software control. It consists of separate server, processor and computers where as ARDUINO does not require a separate processor, no workstation, no operator station here directly connect interfacing card with computer itself. Since DCS is applicable only for big system not less than 5000 input and output but this is costly. A set of six interlock conditions were provided for this purpose. The goal of this work is to control the air dampers in a different way according to the unit load thereby increasing the boiler efficiency and to reduce the pollution. ![]() In this proposed work, design and development of controlling Secondary air dampers in a draft system of a power plant which is presently working on DCS technique has been accomplished by using high computing software ARDUINO and results has been shown with suitable simulation in VISUAL BASICS. Keywords: furnace to windbox differential pressure, windbox to furnace
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