Design and Optimization of LNG Cold Energy Utilization Combined with Geothermal Energy

Natural gas will become a highlight and pillar of China energy development strategy, with most of it being delivered to China in the form of Liquefied natural gas (LNG). Geothermal energy is a kind of clean energy with abundant reserves, good stability and strong renewability. In this paper, organic Rankine cycle is used to combine geothermal energy and LNG cold energy to generate electric energy, and different circulating working media are adopted to improve energy efficiency. As a result, energy efficiency increased from 7.23% to 15.84%, and the optimized system produced 335,703,348kW·h/a of electricity.