TY - JOUR
T1 - Process integration of light hydrocarbon separation and hydrate-based desalination for efficient and practical LNG cold energy recovery
AU - Park, Jiye
AU - Park, Jinwoo
AU - Kim, Junghwan
N1 - Publisher Copyright:
© 2023
PY - 2023/10/15
Y1 - 2023/10/15
N2 - Liquefied natural gas (LNG) regasification occurs over a wide temperature range, and LNG cold energy released from regasification cannot be fully utilized in a single process. Various studies have integrated individual processes to improve LNG cold energy utilization. However, each process has different temperature requirements, and it is challenging to integrate the geographical environment. This study presents a novel LNG cold energy multi-utilization process by integrating light hydrocarbon separation (LHS) and hydrate-based desalination (HYD) for efficient and practical LNG cold energy recovery. In the proposed process, light hydrocarbons in LNG are separated from LHS, which requires cryogenic energy. The remaining LNG cold energy is then utilized for HYD, which requires an operating temperature of 1 °C. Energy, exergy, and techno-economic analyses were compared to the base case, where cold energy was only used for desalination. The results show that a more efficient energy utilization process was achieved by reducing the exergy loss by 16.47 %. High-value materials could be recovered, such as liquefied ethane and liquefied petroleum gas, high-purity methane gas, and pure water. Despite additional equipment costs attributable to LHS, the net annual revenue based on the generated products was 6.66×107 USD/yr, with a payback period of 6.66 yr.
AB - Liquefied natural gas (LNG) regasification occurs over a wide temperature range, and LNG cold energy released from regasification cannot be fully utilized in a single process. Various studies have integrated individual processes to improve LNG cold energy utilization. However, each process has different temperature requirements, and it is challenging to integrate the geographical environment. This study presents a novel LNG cold energy multi-utilization process by integrating light hydrocarbon separation (LHS) and hydrate-based desalination (HYD) for efficient and practical LNG cold energy recovery. In the proposed process, light hydrocarbons in LNG are separated from LHS, which requires cryogenic energy. The remaining LNG cold energy is then utilized for HYD, which requires an operating temperature of 1 °C. Energy, exergy, and techno-economic analyses were compared to the base case, where cold energy was only used for desalination. The results show that a more efficient energy utilization process was achieved by reducing the exergy loss by 16.47 %. High-value materials could be recovered, such as liquefied ethane and liquefied petroleum gas, high-purity methane gas, and pure water. Despite additional equipment costs attributable to LHS, the net annual revenue based on the generated products was 6.66×107 USD/yr, with a payback period of 6.66 yr.
KW - Cold energy
KW - Desalination
KW - Exergy loss
KW - Hydrocarbon separation
KW - Liquefied natural gas
UR - http://www.scopus.com/inward/record.url?scp=85163881782&partnerID=8YFLogxK
U2 - 10.1016/j.desal.2023.116757
DO - 10.1016/j.desal.2023.116757
M3 - Article
AN - SCOPUS:85163881782
SN - 0011-9164
VL - 564
JO - Desalination
JF - Desalination
M1 - 116757
ER -