首页
登录
职称英语
Geothermal(地热的)energy has been used for thousands of years in some countries
Geothermal(地热的)energy has been used for thousands of years in some countries
游客
2023-08-16
22
管理
问题
Geothermal(地热的)energy has been used for thousands of years in some countries for cooking and heating. It is simply power derived from the Earth’s internal heat. This thermal energy is contained in the rock and fluids beneath Earth’s crust. It can be found from shallow ground to several miles below the surface, and even farther down to the extremely hot molten rock called magma(岩浆).
A geothermal heat pump system can take advantage of the constant temperature of the upper ten feet(three meters)of the Earth’s surface to heat a home in the winter while extracting heat from the building and transferring it back to the relatively cooler ground in the summer. Geothermal water from deeper in the Earth can be used directly for heating homes and offices, or for growing plants in greenhouses. Some US cities pipe geothermal hot water under roads and sidewalks to melt snow.
To produce geothermal-generated electricity, wells, sometimes a mile(1.6 kilometers)deep or more, are drilled into underground reservoirs to tap steam and very hot water that drive turbines linked to electricity generators. The first geothermally generated electricity was produced in Larderello, Italy, in 1904.
There are three types of geothermal power plants: dry steam, flash, and binary(二元的). Dry steam, the oldest geothermal technology, takes steam out of fractures in the ground and uses it to directly drive a turbine. Flash plants pull deep, high-pressure hot water into cooler, low-pressure water. The steam that results from this process is used to drive the turbine. In binary plants, the hot water is passed by a secondary fluid with a much lower boiling point than water. This causes the secondary fluid to turn to vapor, which then drives a turbine. Most geothermal power plants in the future will be binary plants.
There are many advantages of geothermal energy. It can be extracted without burning a fossil fuel such as coal, gas, or oil. Geothermal fields produce only about one-sixth of the carbon dioxide that a relatively clean natural-gas-fueled power plant produces. Unlike solar and wind energy, geothermal energy is always available, 365 days a year. It’s also relatively inexpensive; savings from direct use can be as much as 80 percent over fossil fuels.
But it has some environmental problems. The main concern is the release of hydrogen sulfide(硫化氢), a gas that smells like rotten eggs at low concentrations. Another concern is the disposal of some geothermal fluids, which may contain low levels of toxic materials. Although geothermal sites are capable of providing heat for many decades, eventually specific locations may cool down. [br] Two types of water with different pressures and temperatures are used to generate the steam in______.
选项
A、flash plants
B、dry steam plants
C、turbine-driven plants
D、binary plants
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2929732.html
相关试题推荐
Geothermal(地热的)energyhasbeenusedforthousandsofyearsinsomecountries
Geothermal(地热的)energyhasbeenusedforthousandsofyearsinsomecountries
Ourbodiesexperienceanebbandflowofenergythroughouttheday.Thisis
Ourbodiesexperienceanebbandflowofenergythroughouttheday.Thisis
Ourbodiesexperienceanebbandflowofenergythroughouttheday.Thisis
Ourbodiesexperienceanebbandflowofenergythroughouttheday.Thisis
Thousandsofstudents,facultyandstaffboycottedclassesandstagedrallie
Thousandsofstudents,facultyandstaffboycottedclassesandstagedrallie
Thousandsofstudents,facultyandstaffboycottedclassesandstagedrallie
Thousandsofstudents,facultyandstaffboycottedclassesandstagedrallie
随机试题
TheNextDisaster:AreWeReady?AreWeReall
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
设某经济某一时期有1.75亿成年人,其中1.2亿人有工作,0.1亿人在寻找工作
钢筋出厂质量证明文件归档保存的单位是()单位。A.施工 B.监理 C.建设
下列关于舒适性空调送风温差的说法中,正确的是()。A.送风温差越大,风机能耗
下列工程造价信息中,在工程价格市场机制中起重要作用的包括()。A.工程量信息
(2019年真题)根据《发布证券研究报告执业规范》,已通过证券投资咨询从业资格考
某写字楼项目建成后引进一知名物业服务企业提供物业管理服务,该项目采用的市场定位战
共用题干 某商业银行2010年未有关指标如下:资本净额为400亿元,人民币贷款
2015年3月31日,某县安全监管部门王某,对本县的某企业进行了现场检查,并针对
最新回复
(
0
)