Solar seawater desalting device with variable flow

Abstract

The invention provides a solar seawater desalting device with a variable flow, which comprises a photovoltaic solar power supply system, a reverse-osmosis seawater desalting device and a frequency-conversion control system, wherein the reverse-osmosis seawater desalting device is provided with two branches connected in parallel, the first branch is sequentially provided with a seawater medium-pressure pump, a first one-way check valve and a differential-pressure energy recovering device from front to back, the delivered liquid enters the differential-pressure energy recovering device after being pressurized by the seawater medium-pressure pump, and the pressure of the delivered liquid is boosted to the rated pressure of a reverse-osmosis membrane module by the differential-pressure energy recovering device; and the second branch is sequentially provided with a seawater high-pressure pump and a second one-way check valve from front to back, and the pressure of the delivered liquid is directly boosted to the rated pressure of the reverse-osmosis membrane module by the seawater high-pressure pump. The solar seawater desalting device can independently run by utilizing solar energy so as to have low equipment cost and running and maintaining cost, can utilize the peak valley characteristic of solar power generation, furthest increases water yield and is suitable for remote islands, boats and families short of power supply.

Description

technical field [0001] The invention relates to a seawater desalination device, in particular to a variable flow solar seawater desalination device. Background technique [0002] Water is the source of life, the lifeblood of social and economic development, and a precious and irreplaceable natural resource for human beings. With the continuous development of the economy and the continuous improvement of people's living standards, the demand for water is increasing, and the requirements for water quality are getting higher and higher. However, the shortage of water resources, the uneven distribution of time and space, and the excessive Exploitation, unrestrained waste, random pollution and poor management have exacerbated the already tense contradiction between supply and demand of water resources, and the problem of water shortage has become a worldwide problem. [0003] Seawater desalination, as an open-source technology, can increase the total amount of local water resour...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent ZL02281876.6 discloses a solar reverse osmosis seawater desalination device, which uses steam generated by solar energy to directly drive a turbo pump to provide the inflow flow and pressure of the reverse osmosis components. This solar reverse osmosis seawater desalination device requires a large The steam that directly drives the turbopump can only be generated by a high-quality solar collector, which requires a large area and a large investment

On the one hand, the reverse osmosis desalination module does not have a specially designed energy recovery device, and the energy consumption of the reverse osmosis water production system is high; on the other hand, the reverse osmosis device cannot automatically adjust the power and water recovery rate, and cannot adapt to the characteristics of unstable solar power output. There is a major process error that the security filter is set after the high-pressure pump, and the practical application is limited

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