Power Engineering Part A Unit 11 Rated A+

Power Engineering Part A Unit 11 Rated A+ Air Heater Transfer heat from the flue gas, or from steam, to the combustion air entering the boiler, to improve combustion efficiency Blowoff Valve Manually operated valve connected to a boiler for the intermittent discharge of boiler sediment, for lowering a boilers water level, or for draining a boiler Blowoff Vessel Vessel that intercepts, cools, and depressurizes boiler blowoff water, on order to protect municipal sewer systems Boiler Bank A group of watertubes that form part of a water boiler circulatory system, and to which heat is transmitted mainly by convection from the products of combustion Bubbling Bed A fluidized bed in which the fluidizing velocity is less than the terminal velocity of individual bed particles Chevron Dryer (Scrubber) Series of diagonal baffles installed in a steam flow path, designed to separate fine droplets of moisture from the steam by means of inertial impact of the surfaces of the baffles Circulating Fluidized Bed Boiler Fluidizing velocities exceed the terminal velocity of individual bed particles. Unburned and smoldering fuel particles are introduced back to the furnace Circumferential Joint A welded or riveted seam that runs the circumference of a boiler or pressure vessel shell Coil Tube Boiler A once-through boiler made of coils of steel or copper tube that are exposed to the heat of combustion Condensing Boiler Designed to extract additional heat from flue gas by lowering it to below its condensation temp Copper Tubular Boiler A coil tube heating boiler with tubes constructed of copper Course A cylindrical pressure vessel component of which heads or other courses are attatched Cyclone Separator A steam drum internal that uses centrifugal action to separate steam and moisture particles Diagonal Stay A brace used in firetube boilers between a flat head or tube sheet and the shell Dissolved Solid A solid impurity in solution with water. In boilers, calcium and magnesium salts are scale-forming dissolved solids Downcomer A tube or pipe in a boiler or waterwall circulating system through which fluid flows downward Drum A shell closed at both ends, designed to withstand internal pressure Dry Pipe A perforated or slotted pipe or box inside a steam drum, and connected to the steam outlet, used to remove moisture particles from the steam Dry-Back Boiler A Multiple-pass tiretube boiler with a rear door protected only with refractory Economizer A heat recovery device designed to transfer heat from the products of combustion to boiler feedwater Electrode A conductor that passes electric current into or away from another substance Ellipsoidal Head A formed head