建立了单井地热采暖取热及热恢复过程的数学模型,利用该模型重点分析了岩石温度的恢复特征。结果表明：在同一深度条件下,距离井壁越近,岩石温度恢复率越大,温度恢复程度越高;岩石温度恢复并不是一个均匀平稳的过程,在开始恢复后60 d左右,距井中心0.1 m处温度恢复率就已经达到85%,100 d左右达到90%;随着换热进行,岩石温度逐年降低,出口温度和取热功率也随之逐年降低。第一个采暖季平均采出水温度为295.87 K,取热功率为724.80 kW,第二个采暖季平均采出均温度为295.18 K,取热功率为696.49 kW。
A mathematical model of single-well geothermal system during the process of heating and heat recovery was established, and the recovery of rock temperature was emphatically analyzed. The results showed that the closer to the well wall, the higher the recovery rate of rock temperature and the higher the temperature recovery degree. The temperature recovery of rock wasn’t a uniform and stable process. About 60 days after the recovery, the temperature recovery rate at 0.1 m from the well center reached 85%, and reached about 90% in 100 days. The rock temperature decreased year by year due to the loss of heat extracted for building heating, and so did the outlet temperature and heat power. In the first heating season, the average outlet water temperature was 295.87 K, and the heat power was 724.80 kW. In the second heating season, the average outlet water temperature was 295.18 K, and the heat power was 696.49 kW.
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