Thermodynamic and Economic Optimization of CO2 Plume Geothermal Systems for Combined Heat and Power Production

O2 Plume Geothermal (CPG) systems are a promising concept for the utilization of petrothermal resources within the context of a futurecarbon capture utilization and sequestration economy. Petrothermal geothermal energy has a tremendous worldwide potential for decarbonizing both the power and heating sector. This paper investigates three potential CPG configurations for combined heating and power generation (CHP) for reservoir depths of 4 and 5 km as well as required district heating systems (DHS) supply temperatures of 70 and 90 °C. The results reveal that a two-staged serial CHP concept (Option II) eventuate in the highest achievable net power output. For a thermosiphon system, the relative net power reduction by the CHP option is significantly lower than for a pumped system. The net power reduction for pumped systems lies between 62.6 and 22.9 %. For a thermosiphon system with 5 km depth and a required DHS supply temperature of 70 °C, the achievable net power by the most beneficial CHP option is even 9.2 % higher than in case of sole power generation.The evaluation of the achievable revenues demonstrate that a CHP application might improve the economic performance of both, thermosiphon and pumped CPG systems. However, the minimal required heat revenue for compensating the power reduction increases with higher electricity revenues.     «

O2 Plume Geothermal (CPG) systems are a promising concept for the utilization of petrothermal resources within the context of a futurecarbon capture utilization and sequestration economy. Petrothermal geothermal energy has a tremendous worldwide potential for decarbonizing both the power and heating sector. This paper investigates three potential CPG configurations for combined heating and power generation (CHP) for reservoir depths of 4 and 5 km as well as required district heating systems (DHS...     »