Ocean thermal energy open circulation joint deep sea reverse-osmosis seawater desalination system

Abstract

The invention discloses an ocean thermal energy open circulation joint deep sea reverse-osmosis seawater desalination system which comprises a flash evaporator, a warm seawater pump, a steam turbine, a speed increaser, a cold freshwater pump, a deep sea reverse osmosis device and a mixing condenser, wherein the flash evaporator is connected with the steam turbine through a pipeline; one side shaft end of the steam turbine is coaxially connected with the warm seawater pump, and the other side shaft end of the steam turbine is coaxially connected with the cold freshwater pump through the speed increaser; a steam outlet of the steam turbine is connected with a steam inlet of the mixing condenser; the deep sea reverse osmosis device is connected with the mixing condenser through a pipeline. Since the steam of the flash evaporator enters the steam turbine and does work to drive the warm seawater pump and the cold freshwater pump to operate simultaneously, the cold freshwater prepared by the reverse osmosis device is fed into the mixing condenser and gets direct contact with the exhaust steam of the steam turbine to exchange heat, and the exhaust steam is cooled into condensed water which is mixed with cold freshwater and output as product water. The system disclosed by the invention has the advantages of low energy consumption, relatively high thermal circulation efficiency, low operation cost, high freshwater yield and the like.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and in particular relates to an ocean thermal energy open cycle combined deep-sea reverse osmosis seawater desalination 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. Ocean thermal energy has the advantages of stable and reliable energy sources, not limited by time and climate, and there is no uneven output or intermittent problems. Therefore, ocean thermal energy can not only be used for power generation, but also very suitable as a driving energy source, such as for underwater vehicles Provide propulsion etc. The thermal cycle process of ocean thermal energy utilization can be divided into open cycle and closed cycle according to the different working fluids and processes used. At present, the working principle of ...

AI Technical Summary

Problems solved by technology

Although the application of the current reverse osmosis device has gradually matured, there are still several deficiencies as follows: First, the feed water of the reverse osmosis device is taken from the seawater on the ocean surface, and the feed seawater is easily polluted and contains impurities such as suspended solids and microorganisms. It not only requires complex pretreatment processes such as coagulation, clarification, filtration, and disinfection, but also easily causes membrane fouling and reduces the service life of membrane modules

At the same time, it cannot be ignored that the quality of the fresh water produced by the current reverse osmosis device is poor, and it is easy to fail to meet the standard of drinking water; the second is that the water recovery rate of the reverse osmosis device is still low, and the discharge of concentrated brine will have a negative impact on the marine ecological environment. Third, with the rapid development of energy recovery devices, the energy consumption of reverse osmosis devices has gradually approached the theoretical minimum value, and the future development space is greatly restricted. New reverse osmosis seawater desalination technology is urgently needed emergence and development

Images