Low-grade heat source-driven water-electricity-cold poly-generation system and method based on ocean thermal energy

Abstract

The invention belongs to the technical field of high-efficiency conversion of low-grade heat sources, and provides a low-grade heat source-driven water-electricity-cold poly-generation system based onocean thermal energy. The system comprises a heater, a steam generator, a separator, an expansion machine, a second-stage ejector, a regenerator, a condenser, an evaporator, a multi-stage spray flashevaporation seawater desalination system, a surface warm seawater input channel, a deep cold seawater input channel, a low-grade heat source input channel and a cold supply pipe. The system providedby the invention is a water-electricity-cold poly-generation system coupled with a multi-stage spray flash evaporation seawater desalination technology, and the targets of recycling low-grade heat energy based on the ocean thermal energy, and providing electric energy, cold and fresh water for users at the same time are achieved. Meanwhile, the energy and matter conversion and utilization efficiency of the system is high, the net output work is increased, and the system has very good economy and very high adaptability to a heat source.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency conversion of low-grade heat sources, and specifically relates to a low-grade heat source-driven hydroelectric cooling polygeneration system and method based on ocean temperature difference energy. Background technique [0002] With the rapid development of the economy and the continuous improvement of people's living standards, my country's energy demand has surged. However, the fossil energy reserves are on the verge of depletion and the environmental problems caused by their utilization have become increasingly prominent, seriously threatening the stability and sustainable development of the social economy. Therefore, the development of low-grade thermal energy conversion and utilization technology, and the efficient recovery and utilization of renewable energy such as ocean temperature difference energy, solar energy, geothermal energy, and industrial waste heat are of great significan...

AI Technical Summary

Problems solved by technology

However, there are still some deficiencies in the existing ocean thermoelectric power generation cycle that need to be improved: the surface warm seawater discharged from the steam generator and the deep cold seawater discharged from the condenser have not been fully utilized, resulting in low energy and material utilization of the system. Low; at the cost of reducing the net power generation, the cogeneration system uses the expander to extract steam or increase the outlet back pressure in exchange for cooling capacity, fresh water and other product output. At the same time, if the compressor is used in the refrigeration subsystem, it will further consume expansion. The output power of the machine; the traditional thermal technology (such as multi-stage flash evaporation, multi-effect evaporation) used in the seawater desalination subsystem of the hydropower cogeneration system has a high risk of corrosion and scaling, and the heat transfer performance is difficult to guarantee

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