An island seawater desalination system and method

Abstract

The invention discloses an island seawater desalting system and method. The island seawater desalting system comprises an electric power supply control system, a diesel engine waste heat recovery system and a low temperature multi-effect distillation system, wherein the electric power supply control system comprises a wind-driven generator and a controller thereof, a diesel generator and a controller thereof, an inverter and master controller; the diesel engine waste heat recovery system comprises a radiator, a heat exchanger and a temperature control three-way flow regulating valve; the low temperature multi-effect distillation system comprises a low temperature multi-effect distiller and a heating water tank. The island seawater desalting system and method disclosed by the invention have the advantages that an island wind / diesel hybrid power generating system focusing on wind generation and assisted by diesel generation is matched, and seawater is desalted through low temperature multi-effect distillation equipment and method; the seawater is desalted through residual wind power when wind power is sufficient, and the seawater is desalted through waste heat of a diesel generator when the wind power is insufficient; the desalting system and method are quite strong in adaptability to instable wind power, and are capable of desalting the seawater under different power supply modes.

Description

technical field [0001] The invention relates to the field of seawater desalination, in particular to an island seawater desalination system and method. Background technique [0002] my country has a long coastline, dotted with coastal islands. However, most of the islands are resource-short of water, and the total amount of fresh water is limited; and the island's power supply system is difficult to connect with the mainland power grid, and there are problems such as high prices and unstable power supply. Therefore, water and electricity supply is an urgent problem to be solved in the development of islands. [0003] The development of island wind energy is an important way to solve the power supply of islands. Wind speed is random in nature, but the output of wind turbines is proportional to the cube of wind speed, so wind power has strong instability. In addition, the correspondence between wind power output and load demand is poor. In my country, every July and August...

AI Technical Summary

Problems solved by technology

Although the reverse osmosis method accounts for about 60% of the global seawater desalination market, the cost of electric energy is relatively high in the case of seawater desalination on islands. In the case of waste heat utilization, the cost of reverse osmosis is much higher than that of low-temperature multi-effect distillation.

In addition, the booster pump in the reverse osmosis system has high requirements for power supply stability, and it is difficult for island power supply with wind power as the main energy source to meet its requirements

Images