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Coal-firedPower Plants

　　The invention of the incandescent light bulb by Thomas A. Edison in1879 created a demand for a cheap, readily available fuel with which togenerate large amounts of electric power. Coal seemed to fit the bill, and itfueled the earliest power stations (which were set up at the end of thenineteenth century by Edison himself). As more power plants wereconstructed 
throughout the country, the reliance on coal increased. Since the First WorldWar, coal-fired power plants have accounted for about half of theelectricity produced in the United States each year. In 1986 such plantshad a combined generating capacity of 289, 000 megawatts and consumed 83percent of the nearly 900 million tons of coal mined in the country thatyear. Given the uncertainty in the future growth of nuclear power and inthe supply of oil and natural gas, coal-fired power plants could well provideup to 70 percent of the electric power in the United States by the end ofthe century.
　　Yet, in spite of the fact that coal has long been asource of electricity and may remain one for many  years (coal    represents  about  80  percent of  United  States  fossil-fuel  reserves),  it has actually never been the most desirable fossil fuel for power plants.Coal contains less energy per unit of weight than natural gas or oil; it isdifficult to transport, and it is associated with a host of environmentalissues, among them acid rain. Since the late 1960's problems of emissioncontrol and waste disposal have sharply reduced the appeal of coal-fired powerplants.  The cost of ameliorating these environmental problems alongwith the rising cost of building a facility as large and complex as acoal-fired power plant,  have also made such  plants less attractivefrom  a purely economic perspective.
　　Changes in the technological base of coal-fired powerplants could restore their attractiveness, however. Whereas some of thesechanges are evolutionary and are intended mainly to increase the productivity of existing plants, completely new technologies for burningcoal cleanly are also being developed.
　　全文翻譯：火力發電廠
　　托馬斯·愛迪生 1879 年發明的白熾燈導致對便宜、易得、可生產大量電能 的燃料的需求。 煤似乎符合這個要求，并成為第一批電廠的燃料(正是愛迪生本人在 19 世 紀末建造了第一批電廠)。 全國到處興建電廠時，對煤的依賴加深了。自第一次世界大戰以來，美國每年約有一半的電力是以煤為燃料的電廠提供的。1986年這些電廠的總發電能力達到 28，900 千瓦并且消耗了當年全國開采的九億噸煤的 83%。考慮到核能發展以及石油、天然氣供應中的不確定因素，到本世紀末，火力發電廠仍可能為美國提供多達70%的電力。然而，盡管煤長期以來一直是電力的原料之一并且可能會繼續如此(煤占美國化石燃料儲量的 80%)，它卻不是電廠的理想燃料。  
　　煤的單位能量含量低于石油和天然氣，而且會導致包括酸雨在內的一系列環境問題。從 1960 年以來，排放控制和垃圾處理的問題極大地削弱了燃煤電廠的魅力。由于減輕這些環境問題需要大量資金，而且建造龐大復雜的燃煤電廠的費用不斷上漲，也使得這些電廠從經濟角度上不具備吸引力。改變火力發電廠的基礎技術卻可能恢復它們的吸引力。雖然某些技術改進是漸進的，其目的只是提高現有電廠的生產率，但人們正在開發全新的清潔燃煤的技術。

 

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