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WORKING OF THERMAL POWER PL

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PRINCIPLE

Coal based thermal power plant works on the principal of ModifiedRankine Cycle.

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LAYOUT OF TPP

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General Layouts of Thermal PowerPlant

The general layout of thermal power plant consists of mainly fourcircuits as shown in [1]. The four circuits are

Coal and Ash circuit

Air and Gas circuit

Feed Water and Steam circuit

Cooling Water circuit

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A boileris a closed vesselin which wateror other fluidis heated. Thefluid does not necessarily boil. (In North America the term "furnace" isnormally used if the purpose is not actually to boil the fluid.) The heatedor vaporized fluid exits the boiler for use in various processes or heatingapplications , including central heating, boiler-based powergeneration, cooking, and sanitation.

http://en.wikipedia.org/wiki/Pressure_vesselhttp://en.wikipedia.org/wiki/Waterhttp://en.wikipedia.org/wiki/Fluidhttp://en.wikipedia.org/wiki/Furnacehttp://en.wikipedia.org/wiki/Central_heatinghttp://en.wikipedia.org/wiki/Boiler_(power_generation)http://en.wikipedia.org/wiki/Boiler_(power_generation)http://en.wikipedia.org/wiki/Cookinghttp://en.wikipedia.org/wiki/Sanitationhttp://en.wikipedia.org/wiki/Sanitationhttp://en.wikipedia.org/wiki/Cookinghttp://en.wikipedia.org/wiki/Boiler_(power_generation)http://en.wikipedia.org/wiki/Boiler_(power_generation)http://en.wikipedia.org/wiki/Boiler_(power_generation)http://en.wikipedia.org/wiki/Boiler_(power_generation)http://en.wikipedia.org/wiki/Central_heatinghttp://en.wikipedia.org/wiki/Furnacehttp://en.wikipedia.org/wiki/Fluidhttp://en.wikipedia.org/wiki/Waterhttp://en.wikipedia.org/wiki/Pressure_vessel

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TYPES OF BOILER1. Fire tube boiler 2. Water tube boiler

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The CFBC Boilers

In Ultra-tech cement, Re-circulation Circulating Fluidized Bed Combu

type Natural Circulation, Single Drum, Top Supported, Water tube boil In the 1980s, American companies began to explore the possibility of

technology to combust fuels with low energy value.

This was attractive from a commercial standpoint due to the abundalow grade fuels compared with the high costs of using conventional f

These plants have proven to be very reliable with many having on-stre

performances of greater than 90%.

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For fuels with high moisture content and low heating value such asbiomass, municipal wastes, paper & pulp industry wastes, sludgeetc. and small capacities, bubbling fluidized bed technology isrecommended.

The circulating fluidized bed technology is considered suitable forwaste fuels with a high percentage of non-combustibles (heating

value 5-35MJ/kg).. The process employs a Circulating fluidized bed combustor that

operates at a temperature of around 800-9000C.

Circulating Fluidized Bed Combustion (C

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Major performance features of thecirculating bed systemare as follows:

a)

It has a high processing capacity because of the high gas velocitythrough the system

b) The temperature of about 870 o C is reasonably constantthroughout the process

c) It has high combustion efficiency

d) Erosion of the heat transfer surface in the combustion chamber is

reducede) Low polluting:NOx and SOx emissions are significantly decreased