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Seawater desalination system and method with variable load reverse osmosis

A technology of reverse osmosis and variable load, applied in the direction of osmosis/dialysis water/sewage treatment, seawater treatment, general water supply saving, etc., can solve the problems of inability to maintain stable water production, poor versatility, etc., achieve wide application range, reduce water production Energy consumption and the effect of reducing operating costs

Inactive Publication Date: 2016-01-20
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The scheme of the experimental research conducted by Enercon of Germany on Utsira Island aims at the design of the energy recovery device specially matched with the system to realize the variable load of a single RO. In this study, the RO brine inlet and outlet of the energy recovery device are respectively equipped with valve , according to the change of load power to control the flow of RO concentrated brine to realize the variable load operation of RO seawater desalination system, which has the defect of poor versatility
The China Institute of Water Resources and Hydropower Research has designed a variable load reverse osmosis seawater desalination system, using an electric valve to replace the conventional concentrated brine control valve. The frequency converter controls the high-pressure pump motor, and the output frequency of the frequency converter and the opening of the electric valve are controlled by PLC. The power of RO seawater desalination is adjustable, and the reverse osmosis system does not use an energy recovery device. In addition, when the output power of the wind power and solar power generation systems is lower than the operating power of the high-pressure pump and fluctuates, the water production will follow the influent flow rate. Since there is no concentrated brine to supplement the RO membrane inlet pipeline through the return pipeline, the stability of the water production cannot be maintained

Method used

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  • Seawater desalination system and method with variable load reverse osmosis
  • Seawater desalination system and method with variable load reverse osmosis
  • Seawater desalination system and method with variable load reverse osmosis

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 As shown (the controller and frequency converter are not shown in the figure), the water production is 50m 3 / d, the RO system with a recovery rate of 40% is an example. The concentrated brine pipeline of RO membrane group 2 is divided into two branches, one branch is the concentrated brine discharge pipeline, and the other branch is the concentrated brine return pipeline. A discharge valve 3 and a return valve 4 are respectively arranged on the concentrated brine discharge pipeline and the return pipeline to control the flow of the concentrated brine. At the same time, a booster pump 5 is arranged behind the return valve 4 on the concentrated brine return pipeline, so that the returned concentrated brine is delivered to the water inlet pipeline of the RO membrane group 2 . When the RO system is in normal operation, the inflow flow is 10.5m 3 / h, the return valve 4 is closed, and the opening of the discharge valve 3 is controlled so that the discharg...

Embodiment 2

[0032] Such as figure 2 As shown, the water production is 50m 3 / d, the RO system with energy recovery device 6 with a recovery rate of 40% is taken as an example. and figure 1 The difference in the process is that an energy recovery device 6 is added to the RO system. When the RO system is in normal operation, all the concentrated brine of the RO membrane group 2 enters the energy recovery device 6 through the discharge valve 3, and the hydraulic energy of the concentrated brine is converted into the hydraulic energy of the original seawater before being discharged; at the same time, 60% of the original seawater enters the energy recovery device 6. After the recovery device 6 obtains hydraulic energy, it is delivered to the water inlet pipeline of the RO membrane group 2 through the booster pump 5, and 40% of the raw seawater is delivered to the water inlet pipeline of the RO membrane group 2 through the high-pressure pump 1. When the output power of the wind power and so...

Embodiment 3

[0034] Such as image 3 As shown, the water production rate is 5m 3 / d, RO system with SWPE7 with 29% recovery as an example. and figure 1 The difference in the process is that SWPE7 is added to the RO system. SWPE7 is composed of an APP pump and an APM engine connected to the coaxial motor. It is realized by allowing the concentrated brine from the RO membrane group 2 to enter the APM engine to convert high-pressure water energy into mechanical energy for reuse by the motor. . When the RO system is in normal operation, the raw seawater enters the RO membrane group 2 through the APP pump, and all the concentrated brine of the RO membrane group 2 enters the APM through the discharge valve 3 to recover energy and then discharge. Since the displacement of APM is fixed, the recovery rate is also fixed. The SWPE7 used in this RO system has a maximum water flow of 1.05m 3 / h. When the output power of the wind power and solar power generation system is lower than the operating ...

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Abstract

The invention belongs to the technical field of seawater desalting and relates to a variable load reverse osmosis seawater desalting system. The variable load reverse osmosis seawater desalting system comprises a controller, a frequency converter, a high-pressure pump and an RO (Reverse Osmosis) membrane set, wherein the frequency converter is used for adjusting a rotary speed of a motor of the high-pressure pump to adjust a water inlet flow of the reverse osmosis membrane set. The variable load reverse osmosis seawater desalting system is characterized in that a reverse osmosis concentrated saline water pipeline of the RO membrane set is divided into two braches; one branch is a concentrated saline water discharging pipeline and the other branch is a concentrated saline water reflowing pipeline; the concentrated saline water discharging pipeline is provided with a discharging valve; the concentrated saline water reflowing pipeline is provided with a reflowing valve and a pressurizing pump; the controller is used for controlling the reflowing valve on the concentrated saline water reflowing pipeline when output power of a power generation system is lower than operation power of the high-pressure pump and is fluctuated to supplement one part of RO concentrated saline water into a water inlet pipeline of the RO membrane set through the pressurizing pump and keep the water inlet flow of the RO membrane set unchanged. The invention further provides a seawater desalting method realized by the system. The variable load reverse osmosis seawater desalting system has the advantages of wide applicable range, stability in operation and high efficiency.

Description

technical field [0001] The present invention relates to wind energy, solar energy and other new energy power generation and reverse osmosis (RO) seawater desalination coupling technology, which is a reverse osmosis seawater desalination process adapted to energy fluctuations. Background technique [0002] Combining the development of new energy and seawater desalination technology can alleviate the problems of fresh water resources and energy shortage in coastal and island areas. Wind energy and solar power generation have been widely used. The two energy sources are highly complementary in time distribution, and the two power generation systems can also be rationally integrated in terms of technical applications. In addition, the RO seawater desalination system has low energy consumption, simple system, and it is easier to couple with wind-solar hybrid power supply technology. Therefore, the combination of wind and solar hybrid power generation and RO seawater desalination...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/44C02F103/08
CPCY02A20/131
Inventor 刘锡文吴水波肖亚苏王金燕赵河立
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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