Sustainability study of medium-deep geothermal buried pipe for heat supply

In order to study the temperature change trend of surrounding geotechnical soil during operation and thermal recovery medium-deep geothermal buried pipe influence on operational stability vertical after recovery. Based data geological stratum in Guanzhong area actual engineering application heating system Xi’an New Area, law heat exchanger is simulated analyzed by FLUENT software. The results show that: four months operation, upper layer soil, reverse exchange zone appears due higher fluid temperature; lower decreases more with increase depth shows a linear direction; without considering groundwater seepage, eight heating, maximum difference 3.02 ℃, average 1.30 ℃ was ℃. has no significant effect long-term pipe, it can be operated continuously stably for long time. Practice that various factors such as stratigraphic structure, pressure, radioactive decay conductivity, below 2000m recovers rapidly decay, fully reflecting characteristics Earth’s constant body.