THE STUDY OF AN ALLOWABLE CALCITE SUPERSATURATION IN LOW TEMPERATURE GEOTHERMAL SYSTEMS  

作　　者：白丽萍[1,2] 孟宪级[1,2] 

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：《Transactions of Tianjin University》1997年第1期62-67,共6页天津大学学报（英文版）

摘　　要：Two geothermal fields with calcite scaling in some wells in Iceland were selected for the study of calcite scaling potential. An allowable supersaturation was found by comparing the degree of calcite supersaturation and actual scaling status in the selected wells.The saturation index,0.37～ 0.48, was the boundary between calcite scaling and no scaling. The information about changes in chloride concentration shows that mixing different waters is the main cause to form calcite scaling in the geothermal wells selected in this study.In this case, the content of chloride can be used as an index of scaling.采用ＷＡＴＣＨ程序计算了冰岛两个地热田井水中碳酸钙的过饱和度，通过与实际结垢情况比较，得到了地热井水中容许碳酸钙过饱和度，饱和指数０．３７～０．４８为碳酸钙垢沉积发生的界限通过分析氯离子浓度变化还发现，不同水质的共混是导致该地热井发生结垢的主要原因，在这种情况下，氯离子可以作为结垢发生的指数。

关 键 词：saturation  index SCALING CALCITE GEOTHERMAL 

分 类 号：TK521[动力工程及工程热物理—热能工程]