System for desalting vacuum membrane distilled seawater by utilizing solar energy and after heat of diesel engine cylinder sleeve cooling water via cascade coupling

Abstract

The invention discloses a system for desalting vacuum membrane distilled seawater by utilizing solar energy and after heat of diesel engine cylinder sleeve cooling water via cascade coupling. The system comprises a diesel engine cylinder sleeve cooling water circulation system, a solar energy hot water circulation system, a feed liquid circulation system, a heat exchanger I, a heat exchanger II, a membrane assembly, a condensation system and a vacuum collection system. After being preheated by a condenser, the seawater enters into a water supply pool and further undergoes cascade heating with the diesel engine cylinder sleeve cooling water and the solar energy hot water in sequence through the heat exchangers I and II to ensure that the temperature of fed seawater achieves the working temperature of the membrane assembly; and a fresh water steam outlet of the membrane assembly is connected with the vacuum collection system through the condensation system. The system has the advantages of being high in utilization rate of the after heat of the diesel engine cylinder sleeve cooling water, high in utilization rate of device energy and suitable for different working conditions, saving the manufacture cost of the fresh water and improving the yield of the fresh water.

Description

technical field [0001] The invention relates to a seawater desalination device, in particular to a vacuum membrane distillation seawater desalination system for cascaded coupling utilization of solar energy and residual heat of cooling water of diesel engine cylinder jackets. [0002] Background technique [0003] Water resources are a necessary condition for the survival and development of human society. my country has a large population base and lack of fresh water resources. Water shortage has seriously hindered the country's social and economic development. However, our country has a long coastline. If we want to use modern technology to open up new water sources on a large scale, seawater desalination is the first choice. At present, mature seawater desalination technologies can be mainly divided into distillation, membrane, electrodialysis and freezing. Distillation methods are mainly multi-effect flash evaporation, multi-effect evaporation, etc. Although they ca...

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Problems solved by technology

[0005] Due to the development and application of membrane distillation technology, it provides a simple and effective method for environmental protection and waste heat utilization in chemical plants, as well as to solve the shortage of fresh water resources in the world, but membrane distillation is a membrane process with phase change, and the latent heat of vaporization is reduced. Utilization of heat energy

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