To improve the utilization rate of hot dry rock resources, it is necessary to recover the energy of geothermal tailwater and improve the net output work. An improved ammonia-water power cycle is proposed based on the Kalina cycle. Taking the geothermal parameters of the Husavik Power Plant in Iceland as the prototype (the water temperature of the geothermal well is 122°C, and the tailwater temperature is 80°C), the numerical simulation of the modified Kalina cycle is carried out by using Engineering Equation Solver software. | Turkish Journal of Earth Sciences Turkish J Earth Sci 2021 30 1151-1161 http earth TÜBİTAK Research Article doi yer-2105-13 Simulation and parametric study on a novel modified Kalina cycle 1 1 1 1 1 Guobin LEI Jun ZHOU Shengchao SHI Fuzhi QI Jiawei XU 1 2 2 2 Jie PENG Jiaqi ZHANG Dongxi LIU Qingyao MENG 1 State Grid Qinghai Electric Power Company Qinghai China 2 Key Laboratory of Efficient Utilization of Low and Medium Grade Energy MOE Tianjin University Tianjin China Received Accepted Published Online Final Version Abstract To improve the utilization rate of hot dry rock resources it is necessary to recover the energy of geothermal tailwater and improve the net output work. An improved ammonia-water power cycle is proposed based on the Kalina cycle. Taking the geothermal parameters of the Husavik Power Plant in Iceland as the prototype the water temperature of the geothermal well is 122 C and the tailwater temperature is 80 C the numerical simulation of the modified Kalina cycle is carried out by using Engineering Equation Solver software. The result shows that the net power output of the modified Kalina cycle increases by compared to that of the Kalina cycle. In addition the parametric study shows that the optimal ammonia concentration of the basic solution in the general area is . The lower the cooling water temperature is the lower the turbine exhaust pressure and the higher the net power output. When the ammonia concentrations of the basic solution are and the optimum pressures are 29 bar 36 bar 41 bar and 45 bar respectively. The results of this study will contribute to the utilization of geothermal energy in hot dry rock. Key words Hot dry rock Kalina cycle power cycle ammonia-water mixture 1. Introduction out that the Kalina cycle had a higher power output than As a kind of geothermal resource with large reserves high the Rankine cycle with isobutene as the working .
