인공 지열 저류층 생성 기술(EGS)을 이용한 국내 지열발전 pilot plant 규모 추정
Generation Capacity Estimation of Pilot Plant with Enhanced Geothermal System in Korea
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초록
이 논문에서는 우리나라에서 인공 지열 저류층 생성 기술을 통한 지열발전 타당성 예비 연구 차원에서pilot plant의 발전용량, 소요비용 및 기간을 추정하였다. 포항지역의 실제 관측 지온증가율 33℃/km를 적용할경우, 5 km 깊이에서 지하 암반의 온도는 180℃가 된다. 이로 부터 지열수 생산온도와 주입온도를 각각 155℃와60℃, binary 발전 열효율을 0.11로 가정하였다. 생산정 2개, 주입정 1개로 이루어진 triplet 시스템에서 생산정당 지열수 유량을 최소 20 kg/sec, 최대 40 kg/sec로 가정하면 발전용량은 각각 1.7 MW와 3.5 MW급으로 추정된다. 현재의 기술개발 추세를 감안할 경우, 3.5 MW급의 pilot plant 건설이 가능할 것으로 판단된다. 투자비용은유럽 및 미국의 자료에 근거해서 우리나라에서 필요한 부지선정 및 각종 관측망 건설비용 등을 고려할 때 약1,000억원이 소요될 것으로 추산되며, 프로젝트 소요 기간은 6.5-7년으로 추정된다.
Abstract
We estimated the generation capacity and corresponding cost and period of pilot plant project with enhanced geothermal system in Korea as a preliminary feasibility study. Production and reinjection temperatures of geothermal fluid were assumed 155℃ and 60℃, respectively, based on reservoir temperature of 180℃calculated from the geothermal gradient of 33℃/km in Pohang area. Thermal efficiency of the binary generation cycle was set to 0.11. Flow rates of 20 kg/sec and 40 kg/sec per well of a triplet system enabled us to estimate the generation capacity of 1.7 MW and 3.5 MW, respectively. Considering technology development trend, we expect the higher generation capacity of 3.5 MW to be achievable. Cost for the pilot plant project is estimated to be 100 billion KRW with help of European and US estimations and including the cost of site selection and monitoring system, while corresponding period to be 6.5-7 years.
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