Thermodynamic and Economic Analysis of a High-efficiency System Integrating ORC Power Generation, CO2 Capture, and CO2 Storage Driven by Complementary LNG Cold Energy and Flue Gas Waste Heat.

Liquefied natural gas (LNG) is a clean primary energy source, and the large amount of cold energy stored in LNG provides an opportunity for sustainable technologies to recover and utilize this energy source. This can improve the energy efficiency of LNG regasification terminals and the economic viability of the LNG supply chain. In this paper, an efficient system integrating ORC power generation, CO2 capture, and CO2 storage driven by complementary LNG cold energy and flue gas waste heat is constructed. The exergy-efficiency of the system is 63.09%, the total round-trip efficiency η_(RTE-Overall) of the system was calculated to be 93.22% and the round-trip efficiency η_(RTE-LCES) of the LCES subsystem was 80.13%, and the total investment cost is 2.033 × 106, with a LCOS of 0.10 USD/ kW⋅h. Zero CO2 emission is realized, which contributes significantly to environmental protection.