A low-pressure membrane seawater desalination device

Abstract

The invention belongs to the technical field of seawater desalination, in particular to a low-pressure membrane method seawater desalination device. The device includes a shell, a reverse osmosis membrane is arranged at the bottom of an inner cavity of the shell, the reverse osmosis membrane is used for filtering seawater, a pressure sensor is arranged in the inner cavity of the shell, the pressure sensor is positioned above the reverse osmosis membrane and is used for measuring the pressure at the reverse osmosis membrane, a solar power generation module is arranged at the top end of the shell, the solar power generation module is used for generating power and storing electric quantity, a storage groove is formed in the side wall of the shell, an expansion air bag is arranged in the storage groove, and resistance wires are arranged at the two ends of the expansion air bag; according to the invention, seawater is desalinated by taking the gravity of the seawater as a working pressure,the investment of energy sources is reduced, the purposes of energy conservation and emission reduction are achieved, the structure of the seawater desalination device is simplified, and the size of the seawater desalination device is reduced, so that the seawater desalination device is suitable for seagoing vessels and civilian use and provides possibility for long-term operation at sea.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, in particular to a low-pressure membrane method seawater desalination device. Background technique [0002] Seawater desalination is the use of seawater desalination to produce fresh water. It is an open-source incremental technology to realize the utilization of water resources, which can increase the total amount of fresh water without being affected by time, space and climate, and can guarantee stable water supply such as drinking water for coastal residents and replenishment water for industrial boilers. Desalination is the process of obtaining fresh water from sea water. Currently used seawater desalination methods include seawater freezing method, electrodialysis method, distillation method, reverse osmosis method, and ammonium carbonate ion exchange method. At present, the application of reverse osmosis membrane method and distillation method is the mainstream in the market....

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Problems solved by technology

[0004] In the prior art, there are also some technical solutions for low-pressure membrane seawater desalination, such as a Chinese patent with application number CN201110353059.5, which discloses a low-pressure seawater desalination device, including a raw material tank, a permeate Tank, forward osmosis membrane device, draw liquid tank and membrane distillation device. This patent combines the forward osmosis process with the membrane distillation process. Through the forward osmosis process, the water molecules in the raw material liquid are diffused into the draw liquid through the forward osmosis membrane so that The draw solution is diluted, and the diluted draw solution is processed by membrane distillation. On the one hand, the required fresh water can be obtained, and the salt removal rate can reach more than 99%. It is concentrated so that it can be recycled. The membrane coupling system of the invention has higher separation performance, easier operation, lower energy consumption, and easier industrialization, but the required equipment is large in size, which cannot be realized for marine and civil applications. , so that long-term operations at sea cannot be realized, which limits the development of the sea economy

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