Ocean thermal energy open cycle power generation system

Abstract

The invention discloses an ocean thermal energy open cycle power generation system, which comprises a flash evaporator, a warm seawater pipeline, a warm seawater pump, a low pressure steam pipeline, a front small steam turbine, a steam compressor, a high pressure steam pipeline, a main steam turbine, a generator, exhaust Steam pipes, surface condensers, cold sea water pipes, cold sea water pumps, steam extraction pipes, heat exchange tube bundles. The low-pressure steam of the present invention is divided into two paths: one path of low-pressure steam enters the front small steam turbine to do work to drive the steam compressor to work, and the other path of low-pressure steam is compressed by the steam compressor to become high-temperature and high-pressure steam, and then enters the main steam turbine to do work to drive the generator to generate electricity. And part of the steam extracted from the main steam turbine is used to heat the seawater in the flash evaporator to increase the amount of steam generated by the flash evaporator. The invention not only effectively reduces the volume of the steam turbine in the existing open cycle, breaks through the problem of limited capacity of a single machine, but also has the characteristics of high system thermal efficiency, high utilization rate of water energy, high net power generation and the like.

Description

technical field [0001] The invention belongs to the technical field of new energy power generation, and in particular relates to an ocean thermal energy open cycle power generation system. Background technique [0002] Ocean thermal energy refers to the energy contained in the temperature difference between the warm seawater on the surface of the ocean and the cold seawater in the deep layer. The advantage of ocean thermal energy is that the energy source is stable and reliable, not limited by time and climate, and there is no problem of uneven or intermittent output. Among various ocean energy power generation methods, ocean thermal energy will eventually overwhelm other ocean energy power generation and take the lead. The thermal cycle process of ocean thermal power generation can be divided into open cycle and closed cycle according to the working medium and process used. The open cycle uses water as the working medium, which will not cause any pollution to the environme...

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Problems solved by technology

[0003] However, there are two very significant shortcomings in the current open cycle: one is that the specific volume of water vapor at low pressure is too large, which makes the steam turbine too large, which is not only difficult to manufacture but also expensive, so the single machine power of the open cycle is greatly limited The second is that less than 0.5% of the warm seawater in the flash evaporator turns into water vapor, so a large amount of warm seawater has to be pumped in order to generate enough steam, the utilization rate of water energy is extremely low, and the proportion of pump power consumption in the total power generation is too large , so that the net power generation is greatly reduced

Due to the constraints of the above factors, the development of the open cycle is too slow at present. Countries in the world today are more inclined to the development of the closed cycle, which is relatively easy to achieve, and has achieved great development. However, the heat exchanger of the closed cycle is inefficient and Easy to be corroded and adhered by marine organisms are still difficult technical problems to overcome. What can not be ignored is that the closed cycle cannot by-produce fresh water. For marine thermal power plants built on islands, this shortcoming of using a closed cycle will be very obvious

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