Coal Based Thermal Power Plants

Subsystems of Thermal Power Plant: The Subsystems of Thermal Power Plant are the auxiliary plants required for the plant for its proper operation and for the increase of their efficiency. Some of the sub systems are as follows: Boiler Accessories: The appliances used to increase the efficiency of the boiler are known as boiler accessories. […]

Steam Condenser – Definition, Working Principle and Types: Steam condenser is a device in which the exhaust steam of a turbine is condensed by means of cooling water below atmospheric pressure. By decreasing the exhaust pressure of steam below atmosphere, the efficiency of the power plant is greatly improved. The condensed steam is called condensate

Steam Turbine Working Principle and Types: Steam turbines are one of the most versatile and oldest prime movers that transform the potential energy of the steam into kinetic energy and later in turn transformed into mechanical energy – rotation of turbine shaft. Working principle: The steam energy is converted into mechanical work by expansion through

Pressurised Fluidised Bed Combustion System (PFBC): Pressurised Fluidised Bed Combustion (PFBC) system is used for large coal burning applications. The operating efficiency of PFBC is increased by introducing differential air pressure. In PFBC, coal is injected into pressurized bed of 850 – 900°C. The bed consists of 90 – 95% of coal ash and desulphurisation

Circulating Fluidized Bed Combustion System (CFBC): The Circulating Fluidized Bed Combustion System (CFBC) has evolved from conventional bubbling bed combustion to over come some of the drawbacks associated with bubbling bed combustion. CFBC provides greater flexibility in burning wide range of coal and other fuels without reduction in efficiency and with reduced pollution. The Circulating

Bubbling Fluidized Bed Combustion System: In Bubbling Fluidized Bed Combustion System (or) Atmospheric bed combustion system, coal is crushed to a size of 1 – 10 mm depending upon the quality of coal and type of fuel fed into the combustion chamber. Air is used for both fluidization and combustion. Air is allowed to pass

Fluidized Bed Combustion Boiler Working and Types: The coal available in India is of low quality, high ash content and low calorific value. The traditional grate fuel firing systems have got limitations and are techno-economically unviable to meet the challenges of future. Fluidized Bed Combustion Boiler has emerged as a viable alternative and has significant

Velox Boiler – Construction, Working Principle and Advantages: Velox Boiler – When the gas velocity exceeds the sound velocity, the heat is transferred from the gas at much higher rates than rates achieved with sub-sonic flow. This advantage is used to utilize the large heat transfer from a smaller surface area in this boiler. Construction

Loeffler Boiler Construction and Working Principle: The major disadvantage in La Mont boiler is the deposition of salt and sediment on the inner surface of the water tubes. It reduces the heat transfer and ultimately the generating capacity. The salt deposition will increase overheating. In Loeffler boiler, this problem is solved by preventing water from

Benson Boiler – Construction, Working Principle and Advantages: In 1927, Benson boiler was developed by Benson in West Germany. It was the first super critical drumless boiler. Construction: It is a high pressure, vertical, fire tube boiler. The Fig. 1.31 shows the schematic arrangement of a Benson boiler. This boiler has no drum and is