冰岛低温地热水供热系统碳酸钙沉积的成因  

THE STUDY OF CALCITE SCALING POTENTIAL IN LOW TEMPERATURE GEOTHERMAL WELLS IN ICELAND

作　　者：白丽萍[1,2] 孟宪级[1,2] Sverrir Thorhallsson 

机构地区：[1]天津大学地热研究培训中心 [2]冰岛国家能源局

出　　处：《太阳能学报》1998年第3期271-276,共6页Acta Energiae Solaris Sinica

摘　　要：借助化学模型ＷＡＴＣＨ及ＶＤＡＴＡ程序，研究了冰岛低温地热水供热系统的碳酸钙沉积现象。结果表明，在地热水中允许存在一定的碳酸钙过饱和度，而不发生碳酸钙垢的沉积。饱和指数０．２７为冰岛低温地热水中允许的碳酸钙过饱和度。即地热水中可以含有１．９倍理论量的碳酸钙。研究还发现，深层地热水与地表水的共混是导致本研究工作中Ｈｒｉｓｅｙ５号地热井碳酸钙高度过饱和。Two low temperature geothermal fields in Iceland with calcite scaling in some wells are used for the study of calcite scaling potential.The results show that an allowable supersaturation without the precipitation of calcite scaling existed.The saturation index of 0 27 is the allowable supesaturation in low temperature geothermal wells in Iceland.This means that the geothermal water can contain 1.9 times more calcite in solution than the theoretical amount.In addition,The results show that a high degree of calcite supersaturation in Hrisey well No.5 with calcite precipitation is mainly caused by mixing of the geothermal water from deep reservoir and cold water.

关 键 词：地热水 碳酸钙 饱和指数 结垢 供热系统 

分 类 号：TU833.3[建筑科学—供热、供燃气、通风及空调工程] TK521.33[动力工程及工程热物理—热能工程]