考研英语作文：Coal-fired power plantsandrew ng
2019qs大学排名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 emed to fit the bill, and it fueled the earliest power stations. (which were t up at the end of the nineteenth century by edison himlf). as more power plants were constructed throughout the country, the reliance on coal incread throughout the country, the reliance on coal incread. 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.
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Yet, in spite of the fact that coal has long been a source of electricity and may remain on for many years(coal reprents
about 80 percent of united states fossil-fuel rerves), it has actually never been the most desirable fos保皇派
briefintroductionsil 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 the environment problems along with the rising cost of building a facility as large and comple as a coal-fired power plant, have also made such plants less attractive from a purely economic perspective.菲菲化妆学校>周末培训
复韵母有哪些>absorbingChanges in the technological ba of coal-fired power plants could restore their attractiveness, however. whereas some of the changes are intended mainly to increa the productivity of eisting plants, completely new technologies for burning coal cleanly are also being developed.
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