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Boiler Parts (Platen Super Heater)

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Platen super heater or pendent super heater (PSH) Platen Super heaters are placed just above the goose neck. the flue gases leaving the furnace transfer heat at first to platen super heater. The super heated steam from LTSH outlet header goes to platen SH inlet header and again take sensible heat from flue gas by running throug h PSH coil. The coil of this SH are hanging type and comes in first pass (furnace side) of boiler. In a 210 MW boiler there are 29 coils having 26 loop tube with 51 mm dia and different thickness as 4.5/5.6/7.1/8.8/10 mm are used to make platen super heater. There is an arrangement between PSH and final SH called as attemperation to control the final temperature of super heated steam. all headers are lying in Top and sealed space of Boiler Furnace named as Pent House.
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BOILER PARTS (Water wall and Drum)

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Boiler Parts : Water walls Almost all modern power boilers are equipped with water walls. In large boilers, water walls completely cover the interior surfaces of the furnace providing practically complete elimination of exposed refractory surface; Waterwalls serve as the only means of heating and evaporating the feed water supplied to the boiler from  economizers . Waterwalls usually consists of tangential vertical tubes and are connected at the top and bottom to headers. These tubes receive water from the boiler drum by means of downcomers connected between drum and Waterwalls lower header (Bottom Ring Header). In a boiler approximately 50% of the heat released by combustion of fuel in the furnace is  absorbed  by Waterwalls. Heat so absorbed by the Waterwalls is used in evaporation of water supplied to the boiler. The evaporated steam supplied to Boiler Drum again by mean of riser tubes from top header of water wall. W/W Top Header water wall of a thermal powe...
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Introduction to Thermal Power Plant

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INTRODUCTION TO THERMAL POWER PLANT: The thermal power plant are coal based power plants. It uses coal as a fuel to generate steam from water in its boiler. There is a closed cycle to enable the working fluid (water) to be used again and again. The cycle used in steam power plant is “Rankine Reheat and Regenerative cycle (modified Rankine cycle).  The figure shows this cycle and is self explanatory. Simple power plant steam water cycle  Rankine Reheat and Regenerative Cycle [2] On large turbines, it becomes economical to increase the cycle efficiency  by using reheat, by returning partially expanded steam, to a reheater, the average temperature at which heat is added, is increased and, by expanding this reheated steam to the remaining stages of the turbine, the exhaust wetness is considerably less than it would otherwise be conversely. Regenerative heating of the boiler feed water is widely used in modern Power plants; the effect being to increase the average temperatu...
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