Desalination systems of photovoltaic direct-driven membance capacitive deionization

Patent metadata

Field	Value
Publication number	US-2023065482-A1
Application number	US-202217816433-A
Country	US
Kind code	A1
Filing date	Aug 1, 2022
Priority date	Aug 30, 2021
Publication date	Mar 2, 2023
Grant date	—

Abstract

The present disclosure relates to a desalination system of photovoltaic direct-driven membrane capacitive deionization. The system includes a photovoltaic direct-driven group and a municipal power grid-connected group. The photovoltaic direct-driven group includes a photovoltaic power collection unit, a power storage unit, a direct-driven power monitoring unit, a voltage adjustment unit, and a membrane capacitive deionization water purification unit. The municipal power grid-connected group includes a grid-connected control unit, a grid busbar unit, and an intelligent detection unit.

First claim

What is claimed is:

1 . A desalination system of photovoltaic direct-driven membrane capacitive deionization, comprising a photovoltaic direct-driven group and a municipal power grid-connected group, wherein
the photovoltaic direct-driven group includes a photovoltaic power collection unit, a power storage unit, a direct-driven power monitoring unit, a voltage adjustment unit, and a membrane capacitive deionization water purification unit; the municipal power grid-connected group includes a grid-connected control unit, a grid busbar unit, and an intelligent detection unit; the photovoltaic power collection unit supplies power to the membrane capacitive deionization water purification unit and the power storage unit at the same time or separately; the voltage adjustment unit is located between the photovoltaic power collection unit and the membrane capacitive deionization water purification unit; the power storage unit is connected in parallel with the voltage adjustment unit and located between the photovoltaic power collection unit and the membrane capacitive deionization water purification unit; and the direct-driven power monitoring unit is respectively connected to the power storage unit and the membrane capacitive deionization water purification unit; and the grid-connected control unit is located between the photovoltaic power collection unit and the grid busbar unit; the intelligent detection unit is respectively connected to the grid busbar unit, the grid-connected control unit, and the voltage adjustment unit in the photovoltaic direct-driven group.

2 . The desalination system of claim 1 , wherein
the voltage adjustment unit boosts and stabilizes the photovoltaic direct current to meet needs of membrane capacitive deionization direct current power supply; the power storage unit obtains surplus electric energy from the photovoltaic power collection unit and stores it, and supplies direct current to the membrane capacitive deionization water purification unit; and the direct-driven power monitoring unit simultaneously monitors electricity consumption of the power storage unit and the membrane capacitive deionization water purification unit, and flexibly allocates between the membrane capacitive deionization water purification unit and the power storage unit.

3 . The desalination system of claim 1 , wherein
when the power storage unit is fully loaded and power supply of the membrane capacitive deionization water purification unit meets a condition, the grid-connected control unit inverts excess electric energy generated by the photovoltaic direct-driven group to the grid busbar unit, and when the photovoltaic direct-driven group do not meet the power supply of the membrane capacitive deionization water purification unit, the grid-connected control unit obtains power from the grid busbar unit to achieve peak shaving compensation; and the intelligent detection unit simultaneously monitors operation status of the municipal power grid-connected group and the photovoltaic direct-driven group, and automatically allocates the power supply in the photovoltaic direct-driven group and the municipal power grid-connected group.

4 . The desalination system of claim 2 , wherein
the voltage adjustment unit includes a voltage booster and a voltage regulator, the voltage booster is used to adjust supplied voltage of the membrane capacitive deionization water purification unit to a required voltage of the membrane capacitive deionization water purification unit, and the voltage regulator is used to control upstream voltage of the membrane capacitive deionization water purification unit.

5 . The desalination system of claim 1 , wherein
the direct-driven power monitoring unit includes a computer, a sensor, and a plurality of switch groups; the sensor is respectively installed on the power storage unit and the voltage adjustment unit, which is used to monitor an electricity consumption state of the membrane capacitive deionization water purification unit and an electricity storage state of the power storage unit; the plurality of switch groups are respectively located between the photovoltaic power collection unit and the power storage unit, between the power storage unit and the membrane capacitive deionization water purification unit, and between the photovoltaic power collection unit and the voltage adjustment unit, which are used to control connection and disconnection of each channel; and the computer is used to collect data obtained by the sensor and formulate a connection and disconnection strategy for each switch group in the plurality of switch groups to switch a working mode of the photovoltaic direct-driven group.

6 . The desalination system of claim 3 , wherein
the grid-connected control unit includes a grid-connected group cabinet, and the grid-connected group cabinet includes an alternating current/direct current (AC/DC) converter, an inverter, and a switch group of the grid-connected group cabinet; the AC/DC converter is located between the grid busbar unit and the voltage adjustment unit in the photovoltaic direct-driven group, which is used to convert grid alternating current into the direct current required by the membrane capacitive deionization water purification unit; the inverter is located between the grid busbar unit and the photovoltaic power collection unit in the photovoltaic direct-driven group, which is used to convert the direct current generated by the photovoltaic collection unit into the alternating current and invert the alternating current to the grid bus unit; and the switch group of the Grid-Connected group cabinet is used to physically switch a direction of power transmission between the grid busbar unit and the photovoltaic direct-driven group.

7 . The desalination system of claim 3 , wherein
the intelligent detection unit is located between the grid busbar unit and the grid-connected control unit, which is connected to the voltage adjustment unit in the photovoltaic direct-driven group, and the intelligent detection unit performs automatic allocation of electric energy between the municipal power grid-connected group and the photovoltaic direct-driven group.

8 . The desalination system of claim 5 , wherein
the plurality of switch group includes a first switch group, a second switch group, and a third switch group; the first switch group is located between the photovoltaic power collection unit and the voltage adjustment unit, the second switch group is located between the photovoltaic power collection unit and the power storage unit, and the third switch group is located between the power storage unit and the membrane capacitive deionization water purification unit; and the first switch group, the second switch group and the third switch group are all normally closed switches.

9 . The desalination system of claim 6 , wherein
the switch group of the grid-connected group cabinet includes a fourth switch group and a fifth switch group, the fourth switch group and the fifth switch group are all normally closed switches; and the fourth switch group is located between the inverter and the grid busbar unit, which is used to control the opening and closing of a passage from the photovoltaic direct-driven group to the grid busbar unit, and the fifth switch group is located between the converter and the grid busbar unit, which is used to control opening and closing of a passage of the grid busbar unit to the photovoltaic direct-driven group.

10 . The desalination system of claim 1 , further comprising a control unit, wherein the control unit is configured to perform operations including:
obtaining salt content information of brackish water; obtaining prese

Assignees

• Univ Changzhou
• Jiangsu Maymuse Environmental Tech Co Ltd

Inventors

• Zhang Yi
• Zhang Yihan
• Shen Min
• Jiang Jianfeng
• Bu Shi

Classifications

• C02F2201/46115

  Electrolytic cell with membranes or diaphragms · CPC title

• C02F2201/4613

  Inversing polarity · CPC title

• C02F2201/4612

  Controlling or monitoring · CPC title

• C02F2209/02

  Temperature · CPC title

• C02F2209/05

  Conductivity or salinity · CPC title