Solar photovoltaic direct-drive seawater reverse osmosis desalting device

Abstract

The invention relates to a solar photovoltaic direct-drive seawater reverse osmosis desalting device and belongs to the technical field of seawater desalting. The solar photovoltaic direct-drive seawater reverse osmosis desalting device comprises a solar photovoltaic panel, a power supply control system, a water-taking pump, a reverse osmosis membrane module as well as a DC-DC circuit, a DC motor set and an electric control valve, wherein the solar photovoltaic panel is connected with an electrical input interface of the DC-DC circuit; the electrical output of the DC-DC circuit is connected with the electrical input of the DC motor set; the water output of the water-taking pump is connected with a water inlet of the reverse osmosis membrane module, a concentrated seawater outlet pipeline of the reverse osmosis membrane module is connected with the electric control valve, a control signal output interface of the power supply control system is respectively electrically connected with a control signal output interface of the DC-DC circuit and the electric control valve; and the DC motor set is connected with the water-taking pump and a high-pressure pump by virtue of couplers. According to the device, a storage battery and an inverter are not required, the energy consumption, the size and the cost are decreased, operating parameters can be adjusted in response to changes in solar irradiance so that the efficient and the normal running of the reverse osmosis membrane module is ensured.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and in particular relates to a solar photovoltaic direct-driven seawater reverse osmosis desalination device. Background technique [0002] The total amount of fresh water resources on the earth is limited and the geographical distribution is uneven, and seawater desalination is an effective way to solve the problem of fresh water shortage. Seawater desalination requires a lot of energy. For distributed applications such as islands and ships with small and medium water consumption and far away from the power grid, it is technically feasible and economical to use solar photovoltaic technology as a source of seawater desalination. [0003] Currently, seawater reverse osmosis devices using solar photovoltaics usually include batteries or inverters. [0004] Chinese patent 201010532277.0 discloses a photovoltaic solar reverse osmosis desalination device, the composition of the device i...

AI Technical Summary

Problems solved by technology

Its disadvantages are that, first of all, the DC-AC inverter structure requires additional DC boost circuits, switch drive circuits, power isolation circuits, over-current / under-overvoltage protection circuits, etc. The structure is complex and the conversion efficiency is low; secondly, the adjustability of the AC motor is poor, and the speed range is small. Therefore, in the case of severe solar radiation changes, the unstable characteristics of the output power of the photovoltaic panel are not conducive to the AC motor. The normal work and the water production performance of the whole device; thirdly, from the cost point of view, the above two points increase the input cost and maintenance cost of the system; therefore, the overall efficiency of the system is low, and the system cost is high

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