Co-generation
Co-generation is the concept or producing two forms of energy from one fuel.One of the forms of energy must always be heat and the other may be electricity or mechanical energy.In a conventional power plant,fuel is burnt in a boiler to generate high-pressure steam.This steam is used to drive a turbine.which in turn drives an alternator through a steam turbine to produce electric power.The exhaust steam is generally condensed to water which goes back to the boiler.
As the low-pressure steam has a large quantum of heat which is lost in the process of condensing,the efficiency of conventional power plants is only around 35%.In a cogeneration plant,very high efficiency levels,in the range of 75%-90%,can be reached.This is so,because the low-pressure exhaust steam coming out of the turbine is not condensed,but used for heating purposes in factories or houses.
Since co-generation can meet both power and heat needs, it has otber advantages as well in the form of significant cost savings for the plant and reduction in emissions of pollutants due to reduced fuel consumption.
参考译文
可再生能源
在上个世纪人们看到,消耗不可再生能源对环境造成的损害比任何其他人类活动都大。从煤炭、原油等化石燃料中产生的电能使大气中积聚了高浓度的有害气体,这反过来导致了许多人们今天需要面对的问题,如臭氧层的减少以及全球气候变暖等。汽车污染也是个主要问题。
【淘金高阶英语六级巅峰阅读 快速阅读03:可再生能源】相关文章:
最新
2016-10-18
2016-10-11
2016-10-11
2016-10-08
2016-09-30
2016-09-30