WO2016154796A1

WO2016154796A1 - Seawater desalination system

Info

Publication number: WO2016154796A1
Application number: PCT/CN2015/075222
Authority: WO
Inventors: 安风玢; 刘典军
Original assignee: 大连善心水业科技有限公司
Priority date: 2015-03-27
Filing date: 2015-03-27
Publication date: 2016-10-06

Abstract

A seawater desalination system, comprising a seawater desalination membrane (102) disposed at the bottom of a deep well (101) having a preset depth; and a main water inlet pipe (103) with one end being connected with the seawater desalination membrane (102) and the other end extending along the deep well (101) to the well mouth of the deep well (101). In the seawater desalination system, by providing the deep well having a preset depth and the seawater desalination membrane at the bottom of the well, the potential energy of seawater in a preset depth is converted into pressure, thereby achieving the purpose of seawater desalination at the bottom of the well.

Description

Seawater desalination system

Technical field

The present application belongs to the technical field of seawater desalination, and in particular relates to a seawater desalination system.

Background technique

Water is the basic requirement for maintaining life and health. Although 70.8% of the earth is covered by water, fresh water resources are extremely limited. Of all water resources, 97.5% are unsalable seawater. In the remaining 2.5% of fresh water, 87% are bipolar ice sheets that are difficult for humans to use, alpine glaciers and snow in the permafrost zone. Humans can really use rivers and lakes and a part of groundwater, which only accounts for 0.26% of the total water volume of the earth, and is unevenly distributed. As a result, more than one billion children, women and men in the world do not have access to sufficient and safe water to sustain their basic needs.

Therefore, in the face of increasingly scarce freshwater resources, there is an urgent need to provide a technology that can desalinate seawater to obtain fresh water.

Summary of the invention

In view of this, the present application provides a seawater desalination system for the purpose of desalinating seawater.

To achieve the above objective, the present application provides the following technical solutions:

A seawater desalination system comprising:

a seawater desalination membrane disposed at the bottom of the deep well at a preset depth;

One end is connected to the seawater desalination membrane and the other end extends along the deep well to a main inlet pipe of the wellhead of the deep well.

Preferably, the method further includes: a filtering device and a plurality of hydro-generators disposed on the main inlet pipe in order from top to bottom.

Preferably, the method further comprises: a fresh water pneumatic pump connected to the fresh water outlet of the seawater desalination membrane and an air compression system connected to the gas port of the fresh water pneumatic pump.

Preferably, the fresh water pneumatic pump comprises:

a first check valve and a second check valve connected to the fresh water outlet of the seawater desalination membrane;

a first container connected to the first one-way valve and connected to the purified water preparation device through the third one-way valve;

a second container connected to the second one-way valve and connected to the purified water preparation device through a fourth one-way valve;

a first electromagnetic reversing valve connected to the gas outlet of the first container and connected to the air outlet of the air compression system, and connected to the return air tank through the fifth one-way valve;

One end is connected to the gas port of the second container, and the other end is connected to the air outlet of the air compression system, and the second electromagnetic reversing valve connected to the return air tank through the fifth one-way valve.

Preferably, the air compression system is a wind and photovoltaic complementary gas system, comprising:

a gas storage tank connected to the gas port of the fresh water pneumatic pump;

a photovoltaic gas generating device, a wind mechanism gas device and a low peak electric gas generating device respectively connected to the air inlet of the gas storage tank;

a pressure sensor connected between the gas storage tank and the low-peak electric gas generating device.

Preferably, the method further includes: a concentrated water pneumatic pump connected to the concentrated water outlet of the seawater desalination membrane by the first hydro-generator;

Wherein, the air port of the concentrated water pneumatic pump is connected to the air compression system.

Preferably, the concentrated water pneumatic pump comprises:

a sixth check valve and a seventh check valve connected to the first hydro-generator;

a third container connected to the sixth check valve and connected to the salt chemical preparation system through the eighth check valve;

a fourth container connected to the seventh check valve and connected to the salt chemical preparation system through a ninth check valve;

One end is connected to the gas port of the third container, the other end is connected to the air outlet of the air compression system, and the third electromagnetic reversing valve connected to the return air tank through the fifth one-way valve;

One end is connected to the gas port of the fourth container, and the other end is connected to the air outlet of the air compression system, and the fourth electromagnetic reversing valve connected to the return air tank through the fifth one-way valve.

Preferably, the method further includes: a low pressure turbine power generation system connected to the return air tank.

Preferably, the method further includes: an elevator installed on one side of the deep well.

Preferably, the method further includes: a switch disposed at an end of the main water inlet pipe away from the seawater desalination film valve.

According to the above technical solution, the present application provides a seawater desalination system, comprising: a seawater desalination membrane disposed at a bottom of a deep well of a preset depth; one end connected to the seawater desalination membrane, and the other end extending along the deep well to the The main inlet pipe at the wellhead of the deep well. The seawater desalination system converts the potential energy of the seawater into a pressure by a deep well of a predetermined depth and a seawater desalination membrane at the bottom of the well to achieve the purpose of desalination of the bottom of the well.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can obtain other drawings according to the provided drawings without any creative work.

1 is a schematic structural view of a seawater desalination system according to Embodiment 1 of the present application;

2 is a schematic structural view of a seawater desalination film according to Embodiment 1 of the present application;

3 is a schematic structural view of a seawater desalination system according to Embodiment 2 of the present application;

4 is a schematic structural view of a fresh water pneumatic pump according to Embodiment 3 of the present application;

FIG. 5 is a schematic structural diagram of a wind-optical complementary gas system according to Embodiment 3 of the present application; FIG.

6 is a schematic structural view of a salt chemical preparation system according to Embodiment 3 of the present application;

7 is a schematic structural diagram of a low-pressure steam turbine power generation system according to Embodiment 3 of the present application;

8 is a schematic structural diagram of a seawater desalination system according to Embodiment 3 of the present application;

FIG. 9 is a schematic structural diagram of a device in a deep well according to Embodiment 3 of the present application.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

For the purpose of desalination of seawater, the present application provides a seawater desalination system, the specific scheme is as follows:

Embodiment 1

As shown in FIG. 1 , FIG. 1 is a schematic structural diagram of a seawater desalination system according to Embodiment 1 of the present application. The desalination system includes:

The seawater desalination membrane 102 is disposed at the bottom of the deep well 101 at a preset depth.

Specifically, in the present application, the preset depth may take a value of 800 m, and the specific limit is not limited, and the depth is greater than 650 m, so that the pressure at the bottom of the deep well is sufficient to satisfy the seawater desalination. The diameter of a deep well generally needs to be more than 2m. The specific limit is not limited and can be set according to the actual space requirements of the system. Inside the deep well 101, it is necessary to install a sealing sleeve from top to bottom to protect the well wall and also to isolate water seepage from the well.

As shown in FIG. 2, FIG. 2 is a schematic structural diagram of a seawater desalination film according to Embodiment 1 of the present application. Wherein, the seawater enters the seawater desalination membrane through the water inlet 201, and the fresh water passes through the permeable membrane (not shown) into the central pipe 202 due to the pressure converted by the potential energy thereof, and the concentrated water flows out through the outlet 203.

One end is connected to the desalination membrane 102 and the other end is extended along the deep well 101 to the main inlet pipe 103 of the wellhead of the deep well 101.

One end of the main inlet pipe 103 is connected to the water inlet of the seawater desalination membrane, and the other end, that is, the water inlet is installed on the pipe wall of the sealing casing at the wellhead of the deep well 101, where the pipe wall is below the sea level, the main inlet pipe The inlet of the 103 is fixedly installed through the wall through the seal, and then the inlet extends through the pipeline to the deep sea to absorb the pure seawater without pollution.

The preset depth of seawater potential is converted into pressure, which dilutes the seawater at the bottom of the deep well through the seawater desalination membrane. For example, when the depth of a deep well reaches 800 meters, the pressure at the bottom of the 800-meter seawater is 8 MPa, so the seawater can pass through the seawater desalination membrane through its potential energy pressure to complete the desalination of the seawater, and achieve energy saving and consumption reduction. purpose.

According to the above technical solution, the first embodiment of the present application provides a seawater desalination system, comprising: a seawater desalination membrane disposed at a bottom of a deep well of a preset depth; one end is connected to the seawater desalination membrane, and the other end is along the The deep well extends to the main inlet pipe of the wellhead of the deep well. The seawater desalination system converts the potential energy of the seawater into a pressure by a deep well of a predetermined depth and a seawater desalination membrane at the bottom of the well to achieve the purpose of desalination of the bottom of the well.

Embodiment 2

Based on the first embodiment, the second embodiment of the present application provides another seawater desalination system. As shown in FIG. 3, FIG. 3 is a schematic structural diagram of a seawater desalination system according to Embodiment 2 of the present application. The sea water The desalination system includes:

The seawater desalination membrane 302 is disposed at the bottom of the deep well 301 at a preset depth.

One end is connected to the seawater desalination membrane 302 and the other end is extended along the deep well 301 to the main inlet pipe 303 of the wellhead of the deep well 301.

A filter device 304 and a plurality of hydro-generators 305 are disposed on the main inlet pipe 303 in order from top to bottom.

Among them, the filtering device includes a multi-media filter and a precision filter from top to bottom. The seawater entering from the main inlet pipe is filtered by a multi-media filter to remove large particles of impurities in the seawater, and then discharged into the precision filter through the main inlet pipe. After the seawater is filtered by the precision filter, the seawater is more than 5 micrometers. The particulate matter is removed to meet the influent requirements for subsequent processing. The seawater coming out of the precision filter is discharged through the main inlet pipe line, and enters a plurality of hydro-generators with huge potential energy. The seawater carries huge potential energy and impacts the hydro-generator to rotate and generate electricity. Into the grid. After the seawater passes through multiple hydro-generators, it continues to drain through the pipeline into the seawater inlet of the seawater desalination membrane installed at the bottom of the well. Because the deep well is about 800 meters deep from the wellhead to the bottom of the well, the pressure of the bottom-hole seawater reaches At 8 MPa, seawater can physically separate the salt from the water through the seawater desalination membrane through its own potential pressure to complete the desalination of the seawater.

Specifically, the number of the hydro-generators can be set to four, which is not limited herein.

Further, the seawater desalination system may further include an elevator 306 installed on one side of the deep well 301 and an on-off valve 307 provided at one end of the main inlet pipe 303 away from the seawater desalination membrane 302.

A small elevator is installed on one side of the deep well to facilitate the construction workers to go down the well. At the same time, when the equipment has a problem, the system can be stopped by shutting off the on-off valve 307, and further dispatched by the staff for maintenance and construction.

It can be seen from the above technical solution that the seawater desalination system provided in the second embodiment of the present invention not only realizes desalination of seawater by utilizing the potential energy of seawater, but also utilizes the impulse of seawater discharge to generate electricity, save energy and reduce consumption, and fully develop and utilize natural energy. .

Embodiment 3

Based on the above two embodiments, the present application provides another seawater desalination system. The seawater desalination system comprises: the seawater desalination system as described in any of the first embodiment or the second embodiment, and may further comprise: a fresh water pneumatic pump connected to the fresh water outlet of the seawater desalination membrane and an air connected to the air outlet of the fresh water pneumatic pump Gas compression system.

4 is a schematic structural view of a fresh water pneumatic pump according to Embodiment 3 of the present application. The fresh water pneumatic pump includes:

a first check valve 401 and a second check valve 402 connected to the fresh water outlet of the seawater desalination membrane;

a first container 404 connected to the first check valve 401, connected to the purified water preparation device through the third check valve 403;

a second container 406 connected to the second one-way valve 402, connected to the purified water preparation device through the fourth one-way valve 405;

One end is connected to the air port of the first container 404, the other end is connected to the air outlet of the air compression system, and the first electromagnetic reversing valve 408 is connected to the return air tank through the fifth check valve 407;

One end is connected to the air port of the second container 406, and the other end is connected to the air outlet of the air compression system, and the second electromagnetic reversing valve 409 is connected to the return air tank through the fifth check valve 407.

The fresh water flows into the first container and the second container through the first check valve and the second check valve, and the air compression system discharges the compressed air into the first container and the second container, and squeezes the fresh water in the container into the purified water preparation device .

Specifically, the compressed air in the air compression system is connected to the intake pipe of the fresh water pneumatic pump through the check valve and the gas supply pipe and the two electromagnetic reversing valves, and the fresh water filtered by the seawater desalination membrane passes through the pipeline and two into the pipeline. The water check valve enters the container of the fresh water pneumatic pump, and then the PLC controls the opening and closing of the two electromagnetic reversing valves through the control cable to complete the supply and deflation of the pneumatic pump, because the structure of the pneumatic pump is composed of two One container, two sets of electromagnetic reversing valve, two sets of water outlet check valves, two sets of water inlet check valves, so we can control one container exhaust water through the PLC at the same time, one container can supply water to the water, you can Make continuous pneumatic pumping water. When the air is supplied, the compressed air can pump the fresh water to the high point through the outlet pipes of the two outlet check valves. When the air is vented, the fresh water enters the pump through the two inlet check valves, and so on. It is possible to complete the pneumatic pumping water.

Specifically, the air compression system described in the present application may be a wind photovoltaic complementary gas system. As shown in FIG. 5, FIG. 5 is a schematic structural diagram of a wind and photovoltaic complementary gas system according to Embodiment 3 of the present application, the wind and photovoltaic complementary gas system includes:

The air outlets are respectively connected to the air reservoirs 501 of the first container and the second container of the fresh water pneumatic pump through the first electromagnetic reversing valve and the second electromagnetic reversing valve.

The gas storage tank is used for storing the compressed air of the gas generating device, and discharging the compressed air into the fresh water pneumatic pump to squeeze the fresh water into the pure water preparation device.

A photovoltaic gas generating device 502, a wind mechanism gas device 503, and a low-peak electric gas generating device 504 are respectively connected to the air inlet of the gas storage tank 501.

A pressure sensor 505 is connected between the gas storage tank 501 and the low-peak electric gas generating device 504.

Specifically, in the present application, the photovoltaic gas generating device 502 includes a solar electric panel 5021 and an air compressor 5023 connected thereto through a cable 5022. The solar panel 5021 converts the solar energy into electrical energy, directly drives the air compressor 5023 through the cable 5022 to produce compressed air, and discharges the gas into the gas storage tank 501 through the check valve 5024 and the gas pipe.

The wind mechanism gas device 503 includes an air compressor 5031 and a wind turbine 5032. The wind turbine 5032 directly drives the air compressor 5031 to produce compressed air that is discharged into the air reservoir 501 through the one-way valve 5033 and the air pipe.

The low-peak electric gas generator 504 is designed to be used as a spare when there is no sun or wind. It is controlled by a pressure sensor 505 installed on the gas storage tank 501. When the compressed air stored in the gas storage tank 501 is lower than the set pressure, the pressure sensor 505 outputs a signal to the PLC control system 506 through the control line, and the PLC controls The system 506 turns on the AC contactor 5041 through a control line. The low peak power 5042 can be used to draw compressed air through the cable-on air compressor 5043, and then replenish the pressure through the check valve 5044 and the gas pipe into the gas storage tank 501. Among them, the low peak power 5042 also supplies power to the PLC through the cable.

The seawater desalination system may further comprise: a concentrated water pneumatic pump connected to the concentrated water outlet of the seawater desalination membrane by the first hydroelectric generator. Among them, the basic structure of the concentrated water pneumatic pump is the same as that of the fresh water pneumatic pump, and the air port of the concentrated water pneumatic pump is also connected with the air compression system.

Specifically, the concentrated water pneumatic pump includes:

a sixth check valve and a seventh check valve connected to the first hydro-generator.

Since the discharge pressure of the brine outlet of the seawater desalination membrane also reaches 8 MPa, it can completely drive the hydroelectric generator to generate electricity for the purpose of residual pressure reuse, so that at least 5 hydro-generators generate electricity and pass The cable is incorporated into the grid to complete the purpose of power generation. Further, it can also provide power for the low-peak electric gas generator.

A third container connected to the sixth check valve and connected to the salt chemical preparation system through the eighth check valve.

Among them, the salt chemical preparation system is shown in Figure 6, including: electronic descaler 601, non-crystalline injection The atomizer 602 and the salt deep processing device 603.

The electronic descaling instrument is an electromagnetic field generated by an instrument, which causes the water molecules to move at a high speed under the action of an electromagnetic field, so that the calcium and magnesium ions in the water are in a moving state and cannot form a scale to prevent scaling. The concentrated brine non-crystallization jet atomizer can further atomize the concentrated brine. After the atomized brine is atomized, the mist droplets are ejected from the atomizing head, and the droplets are dropped and the surrounding air is used. Fully contact, with the help of wind energy and solar energy, so that the concentrated brine is further concentrated, shortening the drying process and time, and providing guarantee for the subsequent deep processing of concentrated brine. The concentrated water is atomized and concentrated by the concentrated brine electronic descaling instrument and the concentrated brine non-crystallization jet atomizer, and then transported to the deep brine deep processing device for further deep processing. Potassium in the concentrated brine, bromine and magnesium are mature. The technology is not repeated here.

a fourth container connected to the seventh check valve and connected to the salt chemical preparation system through the ninth check valve;

a third electromagnetic reversing valve connected to the gas outlet of the third container and connected to the air outlet of the air compression system; and a third electromagnetic reversing valve connected to the return air tank through the fifth one-way valve;

One end is connected to the port of the fourth container, and the other end is connected to the air outlet of the air compression system, and the fourth electromagnetic reversing valve connected to the return air tank through the fifth check valve.

Specifically, the compressed air in the gas storage tank is connected to the intake pipe of the concentrated water pneumatic pump through the one-way valve and the gas transmission pipe, the two electromagnetic reversing valves, and the high-pressure concentrated brine driven water wheel discharged from the seawater desalination membrane After the machine generates electricity, it enters the concentrated water pneumatic pump through the pipeline and two inlet check valves. Then the PLC controls the opening and closing of the two electromagnetic reversing valves through the control cable to complete the supply and release of the pneumatic pump. When the gas is supplied, the compressed air can pump the concentrated brine through the outlet pipes of the two outlet water check valves to the high point. When the gas is deflated, the concentrated brine enters the pump body through the two inlet check valves. In this way, the water can be pumped to the concentrated brine, and the concentrated water can be pumped to the high point by the concentrated water pneumatic pump, and then enter the salt chemical preparation system through the outlet pipe.

The seawater desalination system may further comprise: a low pressure turbine power generation system coupled to the return air tank. As shown in FIG. 7, FIG. 7 is a schematic structural diagram of a low-pressure steam turbine power generation system according to Embodiment 3 of the present application. Specifically, the compressed air with a certain pressure discharged from the fresh water pneumatic pump and the concentrated water pneumatic pump is charged into the return air tank through the respective return air line and the check valve, and the return air tank sequentially passes through the pressure regulating valve 701 and one-way. The valve 702 is connected to the low-pressure steam turbine power generation system 703. The gas in the return air tank enters the low-pressure steam turbine through the air pipe, and drives the low-pressure steam turbine to rotate, thereby driving the generator to generate electricity, so as to achieve the purpose of residual pressure reuse, energy saving and consumption reduction.

For the connection relationship of the above-mentioned various parts, reference may be made to FIG. 8. FIG. 8 is a schematic structural diagram of a seawater desalination system according to Embodiment 3 of the present application, and the system includes all the above components, and details are not described herein. Said. Figure 8 is intended to more intuitively show the connection relationship of various parts of the seawater desalination system in this embodiment. The general details of the equipment in the deep well are shown in Figure 9, and Figure 9 shows more clearly the Figure 8 Desalination of specific equipment connections in deep wells in the system.

It should be noted that the gas flow in the present application needs to pass through the vent pipe. The water flow in the present application needs to pass through the water pipe. The material of the vent pipe and the water pipe is not limited in the present application, and may be selected according to actual needs.

The wind-photovoltaic complementary aerodynamic coastal deep well seawater desalination power generation system provided in the third embodiment of the present application maximizes the utilization of natural energy and greatly reduces the cost of seawater desalination. The program is also applicable to inland rivers, rivers, lakes and moorings where all water sources are used. In the same way, fresh water purification, filtration and power generation are used to save energy and reduce emissions.

Finally, it should also be noted that in this context, relational terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities. There is any such actual relationship or order between operations. Furthermore, the term "comprises" or "comprises" or "comprises" or any other variations thereof is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that comprises a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device that comprises the element.

The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments may be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to make or use the application. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the application is not limited to the embodiments shown herein, but is to be accorded the broadest scope of the principles and novel features disclosed herein.

Claims

A seawater desalination system characterized by comprising:

a seawater desalination membrane disposed at the bottom of the deep well at a preset depth;

One end is connected to the seawater desalination membrane and the other end extends along the deep well to a main inlet pipe of the wellhead of the deep well.
The seawater desalination system according to claim 1, further comprising: a filtering device and a plurality of hydro-generators disposed on the main inlet pipe in order from top to bottom.
The seawater desalination system according to claim 1, further comprising: a fresh water pneumatic pump connected to the fresh water outlet of the seawater desalination membrane and an air compression system connected to the gas port of the freshwater pneumatic pump.
The seawater desalination system according to claim 3, wherein the fresh water pneumatic pump comprises:

a first check valve and a second check valve connected to the fresh water outlet of the seawater desalination membrane;

a first container connected to the first one-way valve and connected to the purified water preparation device through the third one-way valve;

a second container connected to the second one-way valve and connected to the purified water preparation device through a fourth one-way valve;

a first electromagnetic reversing valve connected to the gas outlet of the first container and connected to the air outlet of the air compression system, and connected to the return air tank through the fifth one-way valve;

One end is connected to the gas port of the second container, and the other end is connected to the air outlet of the air compression system, and the second electromagnetic reversing valve connected to the return air tank through the fifth one-way valve.
The seawater desalination system according to claim 3, wherein the air compression system is a wind and photovoltaic complementary gas system, comprising:

a gas storage tank connected to the gas port of the fresh water pneumatic pump;

a photovoltaic gas generating device, a wind mechanism gas device and a low peak electric gas generating device respectively connected to the air inlet of the gas storage tank;

a pressure sensor connected between the gas storage tank and the low-peak electric gas generating device.
The seawater desalination system according to claim 3, further comprising: a concentrated water pneumatic pump connected to the concentrated water outlet of the seawater desalination membrane by the first hydro-generator;

Wherein, the air port of the concentrated water pneumatic pump is connected to the air compression system.
The seawater desalination system according to claim 6, wherein the concentrated water pneumatic pump comprises:

a sixth check valve and a seventh check valve connected to the first hydro-generator;

a third container connected to the sixth check valve and connected to the salt chemical preparation system through the eighth check valve;

a fourth container connected to the seventh check valve and connected to the salt chemical preparation system through a ninth check valve;

One end is connected to the gas port of the third container, the other end is connected to the air outlet of the air compression system, and the third electromagnetic reversing valve connected to the return air tank through the fifth one-way valve;

One end is connected to the gas port of the fourth container, and the other end is connected to the air outlet of the air compression system, and the fourth electromagnetic reversing valve connected to the return air tank through the fifth one-way valve.
A seawater desalination system according to claim 4 or claim 7, further comprising: a low pressure turbine power generation system coupled to said return air tank.
The seawater desalination system according to claim 1, further comprising: an elevator attached to one side of the deep well.
The system of claim 1 further comprising: an on-off valve disposed at one end of said main inlet pipe remote from said seawater desalination membrane.