- 期刊
利用單一裂隙熱能開採循環系統試算加強型地熱案場之發電規模
Using Single Fracture Circle System Calculates Geothermal Power Generation Scale with Enhanced Geothermal System
摘要
地熱潛能與地熱產能的聯繫上須仰賴工程與技術的結合與應用，適當的工程設計將可提升產能達到最佳化。由於將地熱能量自地底開發至地表進行地熱發電所能發出的功率，中間需經過很多能源轉換損耗或是有部分地熱潛能因種種因素無法被開發。本研究採用Tester等人在1979年發展的單一裂隙熱能開採循環系統作為乾熱岩（HDR）增強型地熱開發（EGS）之計算方式，並以Songcai Han等人於2019年提出的一注兩產之增強型地熱開發井概念，估算建置一個5MWe之EGS地熱電廠所需要的條件。假設營運條件為20年能控制在地層溫降20%以內，設定環境參數為發電時間20年，熱電轉換效率6%，起始儲層溫度250℃，注入井及生產井距離200公尺，計算結果需要約1立方公里體積的乾熱岩，需要30條裂隙，裂隙間距為97.62公尺，在儲層內需2830.98公尺，總共需要3,660,000平方公尺的裂隙面積。另外本研究亦針對不同溫度之發電機組效率進行統整比較。
並列摘要
The connection between geothermal potential and geothermal production capacity depends on the combination and application of engineering and technology. Proper engineering design will optimize production capacity. Because the power that can be generated by geothermal fluid from the reservoir to the surface. In the up process, geothermal fluid requires lots of energy conversion and loss or some of the geothermal potential cannot be converted due to various factors. This study adopts the single fracture cycle system developed by Tester et al. in 1979 as the calculation method for enhanced geothermal development (EGS) of hot dry rock (HDR) and uses the one injection and two production methods proposed by Songcai Han et al. in 2019. Using the enhanced geothermal development well concept as a calculation scenario, it is estimated what conditions are required to complete the construction of a 5MWe EGS geothermal power plant. It is assumed that the operating conditions can be controlled within 20% of the formation temperature drop in 20 years, the environmental parameters are set to a power generation time of 20 years. The thermoelectric conversion efficiency of 6%, an initial reservoir temperature of 250°C, and a distance of 200 meters between the injection well and the production well. The calculation results require a volume of about 1 cubic kilometer of hot dry rock. Each fracture spacing is 97.62 meters, and 2830.98 meters are required in the reservoir, resulting in a total fracture area of 3,660,000 square meters. In addition, this study also conducts a comprehensive comparison of the efficiency of generating units at different temperatures.