Geothermal Energy Science

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发表于 2016-6-6 16:58:34 | 显示全部楼层 |阅读模式
1Earth'sinternal heat, fueled by radioactivity, provides the energy for plate tectonicsand continental drift, mountain building, and earthquakes. It can also beharnessed to drive electric generators and heat homes. Geothermal energybecomes available in a practical form when underground heat is transferred bywater that is heated as it passes through a subsurface region of hot rocks (aheat reservoir) that may be hundreds or thousands of feet deep. The water isusually naturally occurring groundwater that seeps down along fractures in therock; less typically, the water is artificially introduced by being pumped downfrom the surface. The water is brought to the surface, as a liquid or steam,through holes drilled for the purpose.
2By far themost abundant form of geothermal energy occurs at the relatively lowtemperatures of 80° to 180° centigrade. Water circulated through heatreservoirs in this temperature range is able to extract enough heat to warmresidential, commercial, and industrial spaces. More than 20,000 apartments inFrance are now heated by warm underground water drawn from a heat reservoir ina geologic structure near Paris called the Paris Basin. Iceland sits on a volcanicstructure known as the Mid-Atlantic Ridge. Reykjavik, the capital of Iceland,is entirely heated by geothermal energy derived from volcanic heat.
3Geothermalreservoirs with temperatures above 180° centigrade are useful for generatingelectricity. They occur primarily in regions of recent volcanic activity ashot, dry rock; natural hot water; or natural steam. The latter two sources arelimited to those few areas where surface water seeps down through undergroundfaults or fractures to reach deep rocks heated by the recent activity of moltenrock material. The world's largest supply of natural steam occurs at TheGeysers, 120 kilometers north of San Francisco, California. In the 1990s enoughelectricity to meet about half the needs of San Francisco was being generatedthere. This facility was then in its third decade of production and wasbeginning to show signs of decline, perhaps because of over development. By thelate 1990s some 70 geothermal electric-generating plants were in operation inCalifornia, Utah, Nevada, and Hawaii, generating enough power to supply about amillion people. Eighteen countries now generate electricity using geothermalheat.
4Extractingheat from very hot, dry rocks presents a more difficult problem: the rocks mustbe fractured to permit the circulation of water, and the water must be providedartificially. The rocks are fractured by water pumped down at very highpressures. Experiments are under way to develop technologies for exploitingthis resource.
5Like mostother energy sources, geothermal energy presents some environmental problems.The surface of the ground can sink if hot groundwater is withdrawn withoutbeing replaced. In addition, water heated geothermally can contain salts andtoxic materials dissolved from the hot rock. These waters present a disposalproblem if they are not returned to the ground from which they were removed.
6Thecontribution of geothermal energy to the world's energy future is difficult toestimate. Geothermal energy is in a sense not renewable, because in most casesthe heat would be drawn out of a reservoir much more rapidly than it would bereplaced by the very slow geological processes by which heat flows throughsolid rock into a heat reservoir. However, in many places (for example,California, Hawaii, the Philippines, Japan, Mexico, the rift valleys ofAfrica)the resource is potentially so large that its future will depend on theeconomics of production. At present, we can make efficient use of onlynaturally occurring hot water or steam deposits. Although the potential isenormous, it is likely that in the near future geothermal energy can makeimportant local contributions only where the resource is close to the user andthe economics are favorable, as they are in California, New Zealand, andIceland. Geothermal energy probably will not make large-scale contributions tothe world energy budget until well into the twenty-first century, if ever.


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 楼主| 发表于 2016-6-6 17:14:36 | 显示全部楼层

【1】地球内部因放射产生的热量为板块运动、大陆漂移、造山运动和地震提供了能量。这种热量还可以用来驱动发电机发电以及为家庭供暖。水流经地表下可能几百甚至几千英尺深的热岩区域(一种热储)被加热,当被加热的水将热量传递出来时,地热能就可以实际形式加以利用了。这些水通常是沿着岩石的断面下渗的天然地下水,少数情况下是人为从地表泵入的水。通过为了采集地热能所钻的孔,这些水会以液体或蒸汽的形式被带到地表。
【2】到目前为止,最丰富的地热能形式介于相对较低的80到180摄氏度的温度。在此温度范围内的热储内循环的水可以提取出足够的热量供居住区、商业区和工业区取暖。目前在法国有20 000间以上的公寓是由温暖的地下水供暖的,这些地下水来自位于巴黎附近叫做巴黎盆地的地质构造的热储。冰岛位于一个被称为是大西洋中脊的火山构造之上。冰岛的首都雷克雅维克完全是用火山热产生的地热能供暖的。
【3】温度高于180摄氏度的地热储集层可用来发电。这类地热储集层主要位于有近期火山活动的区域,以干热的岩石、天然热水或天然蒸汽的形式存在。后两种形式的储集层局限于少数区域,在这些区域,地表水通过地下断层或断裂渗入到被近期的熔岩活动加热的深层岩石。世界上最大的天然蒸汽供应位于加州旧金山以北120公里处的盖沙斯。二十世纪九十年代,那里产出的电能足够满足旧金山半数的需求。当时该电厂已经有三十个年头了,开始显示出发电量下降的迹象,这可能是由于过度的开发所致。到二十世纪九十年代末,加州、犹他州、内华达州和夏威夷约有70个地热发电厂在运转,产生的电能足够满足一百万人的需求。目前有18个国家在利用地热能发电。
【4】要从极干热的岩石中提取热量存在一个更大的难题:岩石需要有裂缝才能让水流通,而且水必须是人工提供的。通过泵入高压水可以将岩石断裂。开发利用此能源的技术的实验正在进行之中。
【5】就像大多数其它能源一样,地热能也具有一些环境问题。如果抽取地下热水而又不泵回,地表就会下沉。此外,地热加热的水含有从热岩中溶出的盐分和有毒物质。这些水如果不能被输送回抽取的地方,将会产生处理方面的问题。
【6】地热能对世界能源未来的贡献是难以估量的。地热能在某种意义上讲是不可再生的,因为多数情况下,与热量流经坚硬的岩石到达热储这个极为缓慢的地质作用的更新速度相比,从热储提取热量的速度要快得多。不过,在很多地区(例如加州、夏威夷、菲律宾、日本、墨西哥、非洲的裂谷),这种能源可能非常可观,它的前景将取决于经济的生产。目前,我们只能有效地利用天然形成的热水或蒸汽形式的地热能。尽管潜能巨大,近期之内地热能可能只能对毗邻用户以及经济状况良好的地区做出重要的局部贡献,就像在加州、新西兰和冰岛地区的情况一样。如果可能的话,地热能估计要到二十一世纪才能对世界的能源预算做出大的贡献。
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发表于 2016-6-6 17:23:26 | 显示全部楼层
感谢分享,国际化的地热论坛,在这里边能找到和学到越来越多的东西了。
梦和苏乙拉
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发表于 2016-6-7 21:53:25 来自手机 | 显示全部楼层
翻译的还不错
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发表于 2016-6-7 22:12:53 来自手机 | 显示全部楼层
地热翻译小王子
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