The invention relates to an island
energy supply system with cold energy. The island
energy supply system comprises an LNG
power generation system unit, a
renewable energy power generation and
energy storage unit and a low-temperature multi-effect
distillation seawater desalination system. The island
energy supply system is a combination island energy supply system formed by power generation and
energy storage systems in a combination mode based on an LNG power generator and unstable
renewable energy such as wind energy,
solar energy and wave energy.
System waste heat is used as a heat source for a
seawater desalination unit. During an
energy storage process, stored LNG is converted into high-pressure
natural gas (NG) by cold accumulation gasifying, the NG enters an NG
storage tank and a
pipe network system for storage and standby application, then air is subjected to compression, indirect cooling and cold accumulation, cold energy is recycled, and after throttling, liquidation storage is carried out. During a power using process, after high-pressure NG absorbs heat and is heated, the high-pressure NG enters a
turbine expansion
machine for working, then the NG enters a small gas
turbine combustion chamber and burns with
compressed air to drive a gas
turbine to work, and
liquid air is subjected to cold accumulation and gradual heat absorption temperature raising and then enters the turbine expansion
machine for working. According to the energy supply system, on-island
electricity energy and
fresh water can be supplied at the same time, unstable renewable resources are converted into stable controllable generated power to be output, system efficiency is improved, power using cost is lowered, and compared with traditional island energy supply system, the island energy supply system has the great advantages.