美国能源部在加利福尼亚州制订了一个钻到地下5千米深火山岩的钻孔计划,以期利用地壳热量。该计划把通到钻孔的水直接灌入熔融岩石内使其变成水蒸汽,通到地面驱动汽轮机进行发电。 美国国立研究所桑迫(Sandia)受能源部的委托已在国内实际调查了21个候补钻孔地,认为加利福尼亚州东北部的Long Valley和coso的温泉最有希望。 这种钻孔开发计划的规模比以前从高热岩体回收热的地热发电更大。计划选择投资费用 The U.S. Department of Energy has developed a drilling program in California to drill a deep volcanic rock at a depth of 5 kilometers in order to use the heat of the earth’s crust. The plan puts the water that passes through the borehole directly into the molten rock and turns it into water vapor, which leads to the ground to drive the turbine to generate electricity. The National Research Institute of the United States, Sandia, has actually investigated 21 candidate boreholes in the country by the Ministry of Energy. He believes that the hot springs in Long Valley and Coso in northeastern California are the most promising. This type of boring development program is larger than previously used geothermal power to recover heat from hot rock masses. Plan to choose investment costs