Method and device for utilizing ocean temperature difference to generate electricity

Abstract

The invention provides an ocean thermal energy conversion method and an ocean thermal energy conversion device. The method comprises the following steps of: heating a low-boiling-point working medium by using hot seawater on a surface of ocean; evaporating the low-boiling-point working medium; feeding into a turbine to push a turbo generator set to work for power generation; condensing working medium gas which is exhausted from the turbine into liquid by using cold seawater on a deep layer of the ocean; heating by using the hot seawater; feeding into the turbine to make the working medium gasevaporated; pushing the turbo generator set to work for the power generation; cyclically executing the steps; and continuously carrying out power generation. Power is generated by using ocean surfacewind power, a heat pump device is driven by the power, the temperature of the working medium is further raised by using a medium of the heat pump device, and the volume expansion ratio of the workingmedium is improved; and the temperature of the cold seawater is further reduced by using the medium of the heat pump device, the working medium exhausted gas is condensed by using the low-temperatureseawater, and a condensing effect of the working medium exhausted gas is improved. The method and the device improve the efficiency of closed cycle generation of ocean thermal energy conversion, realize the comprehensive utilization of ocean thermal energy and wind energy, have an important practical value, provide environment-friendly energy sources, and are easy to use and promote in large scale.

Description

technical field [0001] The invention relates to the field of utilization of ocean temperature difference energy, in particular to a method and device for generating electricity by ocean temperature difference with heating by a wind energy heat pump. Background technique [0002] There is a basically constant temperature difference of 20-25°C between the surface layer of the ocean in the tropics and the depths of hundreds to thousands of meters, which provides a huge and very stable cold and heat source for power generation. The basic principle of ocean temperature difference power generation (OTEC) is to use the high-temperature seawater on the ocean surface to heat and vaporize the low-boiling point working medium, or to vaporize the seawater by reducing the pressure to drive the steam turbine to generate electricity. At the same time, the low-temperature seawater (4-6°C) extracted from the seabed is used to condense the exhaust after doing work to make it liquid again. At...

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Problems solved by technology

In addition, in the actual cycle, there are also losses of components such as pipeline valves, so the power generated by the cycle may not be enough to maintain the normal operation of the working medium pump and the cryogenic seawater pump, which has made it difficult to popularize and apply the ocean temperature difference power generation system.

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