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地球是一个庞大的热库,据估计每年自地球内部传到地表的热量大约相当于1千亿桶石油燃烧所放出的热量。我国广大地区潜藏着极其丰富的地热资源,据初步统计,仅天然地热泉就有2000余处。地热水的用处很多,直接利用为其中之一。地热直接利用设备主要有:(1)井泵及驱动装置;(2)封闭循环系统所需的热交换器;(3)管件保温。在选择上述设备以及供热方法时必须十分慎重,其中首先需要考虑的是地热资源的温度和化学性质。
The Earth is a huge thermal pool. It is estimated that the amount of heat transferred from the Earth’s interior to the surface each year is equivalent to about 100 billion barrels of heat released from the combustion of petroleum. There are extremely abundant geothermal resources hidden in vast areas of China. According to preliminary statistics, there are only 2,000 natural geothermal springs. The utility of geothermal water is many and direct use is one of them. Geothermal direct utilization equipment mainly includes: (1) well pump and drive device; (2) heat exchanger required for closed circulation system; (3) pipe fitting insulation. In selecting the above equipment and heating methods, care must be taken. The first thing to consider is the temperature and chemical nature of the geothermal resources.