KR101751291B1 - Hybrid salinity gradient power generation system for concentrated brine and fresh water - Google Patents

Abstract

The present invention relates to a hybrid salinity differential power generation system using salt differential energy between high concentration brine and fresh water and combining pressure retarded osmosis (PRO) and reverse electrodialysis (RED). The hybrid salinity differential power generation system according to the present invention comprises an osmotic device (PRO) having a first portion to which high-concentration brine is supplied, a second portion to which fresh water is supplied, and a semipermeable membrane for partitioning the first portion and the second portion, )Wow; A pressure recovery device for recovering the pressure of the low-concentration brine having passed through the first portion to pressurize the high-concentration brine supplied to the first portion; A turbine for generating electric power using low-concentration brine having passed through the first portion; And a first reverse electrodialysis unit (RED) for producing electric power using low-concentration brine having passed through the turbine and fresh water having passed through the second portion. According to the present invention, the power generation efficiency can be maximized and the loss energy can be minimized.

Description

HYBRID SALINITY GRADIENT POWER GENERATION SYSTEM FOR CONCENTRATED BRINE AND FRESH WATER BACKGROUND OF THE INVENTION [0001]

The present invention relates to a hybrid power generation system using salinity difference energy between high concentration brine and fresh water, and more particularly, to a hybrid power generation system using salinity difference energy between high concentration brine and fresh water, And to a hybrid salinity differential power generation system capable of maximizing efficiency.

The need for renewable energy is absolutely necessary in the reality that energy consumption due to economic development and population growth is continuously increasing, and buried petroleum resources are relatively depleted, causing oil prices to rise. Among them, it is absolutely necessary to realize the possibility of development through marine energy (Blue Energy) which is used to the present.

  Hydroelectric power plant has a limitation in place to construct a power plant, and there is a huge problem of construction cost of a power plant. In addition, the electric power generation amount is insufficient, so that it is possible to supply electric power locally, but there is a limit to the stable electric power supply of the whole country.

  There is a problem in that it is difficult to produce a constant intensity of power because wind power is not only limited in place but also changes in intensity with time. In addition, as with hydroelectric power generation, the amount of electricity generated is insufficient, and electricity can be supplied locally, but there is a limit to the stable supply of electricity throughout the country.

  In addition, solar power generation requires a huge space for power generation, but also has a problem in that it generates only a small amount of electric power and a power generation efficiency varies greatly according to the weather, which is an auxiliary power supply source.

  On the other hand, PRO and RED devices are all-weather power generation devices that are free from climate and time constraints, and are environmentally friendly and have the advantage of maintaining power generation permanence.

The marine energy obtained from seawater, which accounts for 71% of the surface area of the Earth, is the amount of energy acquired per tonne through the development of marine salinity, excluding tidal power, wave power, Is 1.7 MJ, but the total amount of seawater is 2.6 TW, so the economic and industrial ripple effect of this technology is too great.

The present invention is to provide a salinity difference generation system for recovering salinity difference energy in the mixing process of salt water and fresh water in the form of electric energy by combining the pressure delayed osmosis (PRO) and the reverse electrodialysis (RED) The purpose.

The present invention also relates to a hybrid salinity differential power generation system capable of maximizing power generation efficiency and minimizing loss energy by performing secondary power generation through RED using low-concentration brine that has been subjected to primary power generation through PRO using high- To provide another purpose.

According to an aspect of the present invention, there is provided a hybrid salinity differential power generation system using saline and fresh water, comprising: a first portion to which a first concentration of salt water is supplied; a second portion to which fresh water is supplied; (PRO) having a semipermeable membrane for partitioning the first portion and the second portion; A pressure recovery device for recovering the pressure of the second concentration of brine discharged from the first portion and pressurizing the brine of the first concentration supplied to the first portion; A turbine for generating electricity using the second concentration of brine; And a first reverse electrodialysis unit (RED) for producing electric power by using the second concentration brine having passed through the turbine and the fresh water discharged from the second part.

Preferably, fresh water pressure regulating means is further provided between the second portion and the first RED. And a second RED generating power using a second concentration brine passing through the pressure recovery device and fresh water passing through the second portion. The concentration of saline in the first concentration brine is 10 to 20 wt%. The concentration of saline in the second concentration brine is 3 to 10 wt%. The fresh water pressure regulating means is a pump. And a pipe connecting the second concentration brine having passed through the pressure recovery device with the low concentration brine having passed through the turbine.

According to the present invention, there is also provided a method of generating a hybrid salinity differential using saline and fresh water, comprising the steps of: supplying a first concentration brine into a first section partitioned by a semipermeable membrane in the ostomy apparatus; Generating osmotic pressure by passing through the semipermeable membrane; A pressure recovery step of recovering the pressure of the second concentration brine pressurized through the osmotic pressure step to pressurize the first concentration brine supplied to the first part; The second concentration brine discharged from the first portion passing through the turbine to produce power; And supplying power to the first reverse electrodialyser (RED) through the second concentration brine having passed through the turbine and fresh water passing through the second section without passing through the semipermeable membrane .

As described above, the hybrid salinity differential power generation system of the present invention can maximize the power generation efficiency and minimize the loss energy by combining the pressure delayed osmosis (PRO) and the reverse electrodialysis (RED) power generation.

FIG. 1 is a schematic diagram of a hybrid salinity generation system according to an embodiment of the present invention.
2 is a schematic diagram of a hybrid salinity generation system according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the exemplary embodiments of the present invention, descriptions of techniques which are well known in the art and are not directly related to the present invention will be omitted. This is to omit the unnecessary description so as to convey the key of the present invention more clearly without fading.

FIG. 1 is a schematic diagram of a hybrid salinity generation system according to an embodiment of the present invention. As shown in the figure, the salinity difference generation system according to the present invention includes a first portion 11 to which high-concentration brine is supplied, a second portion 12 to which fresh water is supplied, a first portion 11, An osmotic device (PRO) 10 having a semipermeable membrane 13 defining a portion 12; A pressure recovery device 20 for recovering the pressure of the low concentration brine that has passed through the first part 11 and pressurizing the high concentration brine supplied to the first part; A turbine (30) for generating electric power using low concentration brine having passed through a first part; And a first reverse electrodialyzer (RED) 40 for producing electricity using low-concentration brine that has passed through the turbine and fresh water that has passed through the second portion.

A fresh water pressure regulating means 52 may be further provided between the second portion 12 and the first RED 40 for high efficiency of the RED. As an example of the fresh water pressure regulating means 52, a pump can be used. Further, the second RED 41 may be further provided to generate electricity by using the low concentration brine having passed through the pressure recovery unit 20 and the fresh water having passed through the second portion 12. [

It is preferable that the salt concentration of the high concentration brine supplied to the PRO (10) is 10 to 20 wt%, and the salt concentration of the low concentration brine discharged after mixing with the fresh water in the PRO (10) is 3 to 10 wt%.

The high concentration brine is supplied to the first portion 11 of the PRO 10 and the fresh water is supplied to the second portion 12 of the PRO 10. Part of the fresh water passes through the semi-permeable membrane (13) to generate osmotic pressure, and the high concentration brine becomes low concentration brine and is pressurized by osmotic pressure. This pressure can be used to drive the turbine 30 for primary power generation.

A part of the low concentration brine from the PRO 10 is supplied to the first RED 40 after passing through the turbine 30 and a part of the low concentration brine is supplied to the pressure recovery device 20 to pressurize the high concentration brine supplied to the PRO 10 And then used to drive the second RED 41. Here, the RED (40, 41) can be operated until the supplied low concentration brine is lowered below the concentration of seawater.

2 is a schematic diagram of a hybrid salinity generation system according to another embodiment of the present invention. 2 differs from the embodiment of FIG. 1 in that the basic principle is the same as that of the embodiment of FIG. 1, except that it further includes a member for connecting the low-concentration brine that has passed through the pressure recovery apparatus 20 to the low-concentration brine that has passed through the turbine 30. Therefore, the low-concentration brine used in the pressure recovery device 20 can be reused in the RED 40 without discarding, thereby increasing the efficiency of the system and preventing energy loss.

The method of the present invention is characterized in that high salt brine is supplied to a first part partitioned by a semipermeable membrane and fresh water is supplied to a second part of the osmosis device, Thereby generating an osmotic pressure; A pressure recovery step of recovering the pressure of the pressurized low-concentration brine through the osmotic pressure step to pressurize the high-concentration brine supplied to the first part; Generating low-concentration saline water passing through the first portion while passing through the turbine; And supplying power to the first reverse electrodialysis unit (RED) by supplying low-concentration brine that has passed through the turbine and fresh water that has passed through the second portion without passing through the semipermeable membrane. Preferably, the method further comprises the step of pressure-regulating the fresh water that has passed through the second portion without passing through the semipermeable membrane. The fresh water pressure regulating step can be controlled by using a pump.

And generating power to the second RED using the low-concentration brine decompressed through the pressure recovery step and the fresh water having passed through the second portion. It is preferable that the salt concentration of the high-concentration salt water is 10 to 20 wt%, and the salt concentration of the low-concentration salt water is 3 to 10 wt%. And connecting the low-concentration brine that has passed through the pressure recovery device to the low-concentration brine that has passed through the turbine.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

10: PRO
11: First part
12: second part
13: Semipermeable membrane
20: Pressure recovery device
30: Turbine
40: 1st RED
41: 2nd RED
50, 51, 52: pump
61:

Claims (14)

A hybrid salinity differential power generation system using brine and fresh water,
An osmosis device (PRO) having a first portion to which salt water of a first concentration is supplied, a second portion to which fresh water is supplied, and a semipermeable membrane that divides the first portion and the second portion;
A pressure recovery device for recovering the pressure of the second concentration of brine discharged from the first portion and pressurizing the brine of the first concentration supplied to the first portion;
A turbine for generating electricity using the second concentration of brine;
A first reverse electrodialyser (RED) for producing electricity using the second concentration brine having passed through the turbine and the fresh water discharged from the second part;
A second RED generating power using a second concentration brine having passed through the pressure recovery device and fresh water having passed through the second portion;
Wherein the hybrid salinity differential power generation system comprises:
The method according to claim 1,
Further comprising fresh water pressure regulating means between the second portion and the first RED.
delete The method according to claim 1,
Wherein the first concentration brine has a salt concentration of 10 to 20 wt%.
The method according to claim 1,
And the concentration of saline in the second concentration brine is 3 to 10 wt%.
[Claim 6 is abandoned due to the registration fee.] 3. The method of claim 2,
Wherein the fresh water pressure regulating means is a pump.
The method according to claim 1,
And a pipe connecting the second concentration brine having passed through the pressure recovery device with the low concentration brine having passed through the turbine.
A hybrid salinity differential power generation method using saline and fresh water,
Supplying a first concentration of brine into a first section partitioned by a semipermeable membrane in an osmotic device and supplying fresh water to a second section and generating osmotic pressure by passing the two sections of fresh water through the semipermeable membrane;
A pressure recovery step of recovering the pressure of the second concentration brine pressurized through the osmotic pressure step to pressurize the first concentration brine supplied to the first part;
The second concentration brine discharged from the first portion passing through the turbine to produce power;
Supplying the second concentration brine having passed through the turbine and fresh water having passed through the second portion without passing through the semipermeable membrane to the first reverse electrodialyser (RED) to produce electric power; And
Generating power to the second RED using the second concentration brine decompressed through the pressure recovery step and fresh water passing through the second portion;
Wherein the hybrid salinity differential power generation method comprises the steps of:
[Claim 9 is abandoned upon payment of registration fee.] 9. The method of claim 8,
Further comprising the step of controlling the pressure of the fresh water passing through the second portion without passing through the semipermeable membrane.
delete [Claim 11 is abandoned upon payment of the registration fee.] 9. The method of claim 8,
Wherein the first concentration brine has a salt concentration of 10 to 20 wt%.
[12] has been abandoned due to the registration fee. 9. The method of claim 8,
Wherein the concentration of saline in the second concentration brine is 3 to 10 wt%.
[13] has been abandoned due to the registration fee. 10. The method of claim 9,
Wherein the fresh water pressure control step uses a pump.
[14] has been abandoned due to the registration fee. 9. The method of claim 8,
And combining the depressurized second concentration brine with the second concentration brine passing through the turbine through the pressure recovery step.

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