Abstract
Environmental pollution in China is getting worse. The effective use of geothermal energy can solve the problem of greenhouse gas emissions. This paper introduces a new type of medium-deep geothermal energy utilization system named U-shaped docking well geothermal heat extraction system and analyzes its characteristics. The results show that the system can meet the needs of daily heating, and the heat transfer effect of this system is greater than the concentric casing heat exchange systems. This study provides a new idea for the use of medium-deep geothermal energy.
Highlights
In recent years, many cities in China have experienced large-scale and long-lasting hazy weather, which has aroused strong public concern about air pollution
According to the burial depth, it can be divided into the following three types: (1) shallow geothermal resources with burial depth less than 200 m and temperature less than 25C; (2) medium-deep geothermal resources, buried depth 200–3000 m, temperature above 25C; (3) dry–hot rock geothermal resources, the thermal storage rock mass is more than 3000 m deep, the temperature is greater than 200C, no fluid or only a small amount of underground fluid
We propose a new type of U-shaped docking well geothermal heat extraction system
Summary
Many cities in China have experienced large-scale and long-lasting hazy weather, which has aroused strong public concern about air pollution. China is one of the countries with large reserves of geothermal resources in the world (Zhao and Wan, 2014). Geothermal resources refer to geothermal energy, geothermal fluids and their useful. More than 100 countries in the world develop and utilize geothermal energy and grow at a rate of 12% per year. According to the burial depth, it can be divided into the following three types: (1) shallow geothermal resources with burial depth less than 200 m and temperature less than 25C; (2) medium-deep geothermal resources, buried depth 200–3000 m, temperature above 25C; (3) dry–hot rock geothermal resources, the thermal storage rock mass is more than 3000 m deep, the temperature is greater than 200C, no fluid or only a small amount of underground fluid. As deep geological exploration and drilling technologies have developed, the use of deep geothermal energy is becoming increasingly important (Zhao and Ma, 2015)
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