This method greatly decreases water wastages through evaporation by almost 84% of the wet cooling method. The cooled/condensed steam is returned to the boiler(Rankine cycyle). Steam is circulated inside a radiator-like heat exchanger and is cooled by the natural cold air blown (naturally or using draught fans) between pipes of the heat exchanger. This is the more preffered Cooling method which is now being implemented in most new Steam power stations. This method uses a lot of water through evaporation. The cooled water is pumped back to the condenser, and the cycle is repeated. As the water falls it is cooled by the natural cold air. Here water is sprayed and thus falls down to the water pond under the cooling tower. As the cool water is returned to the boiler, the hot water in the condensor is pumped to the cooling tower. The condenser itself uses cold water and employs the principle of heat exchange. Steam of very high purity is cooled inside the condenser and is returned to the boiler(Rankine cycle). This is the conventional cooling method used in most steam power stations. the individual power station complexity may differ slightly to the schematic and yet over and above that will use the same principle. it is the basis upon which Steam power station designs are done. This schematic diagram must be properly understood. Steam used in boiler chamber is condensed back to water for re-use. This stage is seen as the recycling stage. The steam turbine converts steam energy to rotational mechanical energy, while the Alternator/Generator converts rotational mechanical energy into electrical energy. This stage is seen as the energy conversion stage. Stage 3 & 4: Steam turbine & Alternator/Generator The steam creation by heat accounts for the greater percentage of power station in-efficiency. This stage is seen as the energy loss stage. The initial handling treatment and storage of coal and the final handling and disposal of Ash. This stage is seen as the entrance and exit of fuel( coal )used. As other types of power stations become more efficient it should be possible to completely abandon the use of this type of power station.įigure 2:Thermal power station schematic diagram ( Click on image to view full size image ) ![]() Pros & Cons: what this power station presents AdvantagesĬan be installed anywhere near fuel & water supplyĬosts more to run compared with other types of power stationsįuture generations will have to learn to depend less and less on this type of electricity generating power station, due to a fast increasing depletion of fuels (coal and oil). They have typical life of 30 to 40 years (although most governments have reduced this number to 35 years). These power stations (together with nuclear power stations) are kept running very close to full efficiency for 24 hours a day (unless they are being maintained). This is because steam power stations are slow to start and can not be used to cater for peak loads that generally occur for a short duration. In most countries these power stations are used as base load power stations. ![]() From the turbine the steam is cooled back to water in the Condenser, the resulting water is fed back into the boiler to repeat the cycle.īecause of the abundance of fuel (coal), this kind of power station can be used to produce large amounts of electrical energy. This is the cycle of the steam produced in the boiler, then taken to the Steam turbine ( prime mover). This power station uses the Rankine cycle. This type of power station is widely used around the world. Introduction: Steam/Thermal Power stationĪ steam/thermal power station uses heat energy generated from burning coal to produce electrical energy. Figure 1: Bobov Dol Thermal Power Plant in Bulgaria showing three cooling towers ( Click on image to view full size image )
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |