42.Coal-fired power plants
The invention of the incandescent light bulb by Thomas A. Edison in 1879 created a demand for a cheap, readily available fuel with which to generate large amounts of electric power. Coal seemed to fit the bill, and it fueled the earliest power stations. . As more power plants were constructed throughout the country, the reliance on coal increased throughout the country, the reliance on coal increased. Since the First World War, coal-fired power plants had a combined in the United States each year. In 1986 such plants had a combined generating capacity of 289,000 megawatts and consumed 83 percent of the nearly 900 million tons of coal mined in the country that year. Given the uncertainty in the future growth of the nearly 900 million tons of coal mined in the country that year. Given the uncertainty in the future growth of nuclear power and in the supply of oil and natural gas, coal-fired power plants could well provide up to 70 percent of the electric power in the United States by the end of the century.
Yet, in spite of the fact that coal has long been a source of electricity and may remain on for many years, it has actually never been the most desirable fossil fuel for power plants. Coal contains less energy per unit of weight than weight than natural gas or oil; it is difficult to transport, and it is associated with a host of environmental issues, among them acid rain. Since the late 1960s problems of emission control and waste disposal have sharply reduced the appeal of coal-fired power plants. The cost of ameliorating these environment problems along with the rising cost of building a facility as large and complex as a coal-fired power plant, have also made such plants less attractive from a purely economic perspective.
Changes in the technological base of coal-fired power plants could restore their attractiveness, however. Whereas some of these changes are intended mainly to increase the productivity of existing plants, completely new technologies for burning coal cleanly are also being developed.
与限制限定有关的英语的单词
与“吃和爱”相关的英语的单词
表示缺乏和惊吓的单词
英语四级听力名师学习方法的精讲:长对话
与“相同不同和改变”相关的英语的单词
英语四级听力名师学习方法的精讲:短对话
与集合和群伙相关的英语的单词
与“正确和错误”有关的英语的单词
与生死和遗憾的英语的单词
大学英语四级考试听力过关的必备:常见短语
和词根tract, treat, trait, peri相关的英语单词
大学英语四级考试听力过关的必备:考前20天
大学英语四级考试听力过关的必备:记叙文解析
与文学及书写相关的英语的单词
表达法律和犯罪相关的英语单词
与“买卖”相关的英语的单词
表示“持续、忍受和确定”的单词
最新大学英语四级听力场景的指导:修理场景
与“愤怒、厌恶”相关的单词
最新大新英语四级听力句型模式化的训练 :虚拟语气
表“跟随和心”相关的英语的单词
大学英语四级考试听力过关的必备:听力应试技巧
与“争辩和看见”有关的英语的单词
英语四级听力名师学习方法的精讲:短文理解
表证明和感激的英语的单词
与“多少和大小”相关的一些单词
与“建筑建造”相关的英语的单词
词根ply, pli, ple,pon, pound相关的英语单词
大学英语四级考试听力过关的必备:听写五大攻略
大学英语四级考试听力过关的必备:听力技巧
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |