推荐回答(1个)
我国开发利用地热已有2000多年的悠久历史,是世界上利用地热资源较早的国家之一。我国历史上对地热资源的开发利用大多限于对温泉的直接利用上,且主要用于医疗和洗浴方面。中华人民共和国成立以后系统进行了地热资源勘查与开发,20世纪70年代初期,我国开始勘查与开发隐伏地热资源。在地质部第一任部长李四光的积极创导、推动和直接指导下,以北京、天津地区开展隐伏地热田资源的普查勘探为先导,相继在天津市近郊、北京城东南地区1000m左右深度打出了温度在40~90℃的地热水,随即在城市地区开始了地热供暖、医疗洗浴、水产养殖、工业洗涤等方面的应用,带动了全国地热资源的勘查工作,由此将我国的地热资源勘查与开发工作推向了一个新阶段。进入20世纪80年代,地热资源开发利用进入快速发展阶段。地热资源勘查开发工作中的国际合作与科技交流得到加强,引进了一些先进地热科技理论和勘探技术方法,开展了对地区经济发展有影响的地热田勘查评价和区域地热资源评价,对我国地热资源的分布、形成与开发利用条件等有了一些规律性认识。重视了开发利用地热资源发展当地经济,发展地热养殖,开办集医疗、娱乐、旅游于一体的温泉旅游度假村及不同形式的地热综合利用等。尤其是20世纪90年代以来,在市场经济需求推动下,地热资源开发利用得到更加蓬勃发展,地热开发最大深度超过4000m。目前,全国各省(自治区、直辖市)都进行了地热资源勘查与开发,应用范围日益广泛。近年来,中国地质调查局组织实施了部分地区地热资源勘查,北京市、天津市等国土资源局(厅)在地热管理中积累了成熟的经验和丰富的资料,中国能源研究会地热专业委员会和中矿联地热专业委员会在地热资源评价和开发利用方面也做了大量工作。
目前,我国地热资源主要应用于以下方面:
高温地热发电。我国拥有150℃以上高温水热系统的温泉区近百处,主要集中分布于藏滇地热带和台湾地热带。藏南、滇西、川西和台湾北部是我国开发利用高温地热能资源最有远景的地区。20世纪70年代后期,我国开始利用高温地热资源发电,先后在西藏羊八井、郎久建工业性地热发电站,总装机容量28.18MW。其中羊八井地热电站装机容量25.18MW,利用每年1.095×107m3流量、温度130~170℃的水汽,实际发电稳定在18.5MW,约占拉萨电网全年供电量的40%,冬季超过60%。目前,全国运行的地热发电站有西藏羊八井和朗久、广东丰顺、湖南灰汤四座。
中低温地热直接利用。我国中低温地热直接利用主要用于地热供暖、医疗保健、洗浴和旅游度假、养殖、农业温室种植和灌溉、工业生产、矿泉水生产等方面;并逐步开发了地热资源梯级利用技术、地下含水层储能技术等。目前,在全国地热水利用方式中,供热采暖占18.0%,医疗洗浴与娱乐健身占65.2%,种植与养殖占9.1%,其他占7.7%。
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