Island energy supply system with cold energy

Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of renewable energy power generation, energy storage and intelligent energy systems, and in particular relates to a high-efficiency combined island energy supply system based on LNG (liquefied natural gas) power generation and unstable renewable energy power generation and energy storage systems. Background technique [0002] Islands rich in renewable energy have been facing energy / power shortages due to their distance from land and the high cost and maintenance costs of connecting to large power grids. In recent years, the use of renewable energy to solve the problem of island energy supply shortage, promote the development of island and regional economies, and protect the increasingly fragile ecological environment of islands has attracted widespread attention in the engineering field all over the world. [0003] At this stage, the existing energy supply system on the island is mainly based on conventional...

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Problems solved by technology

Due to its low energy density, high maintenance cost, short service life and material pollution, conventional batteries pose risks to the large-scale promotion of island energy supply systems

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