CN219570279U - An airbag type residual pressure energy recovery device and seawater desalination system - Google Patents

Abstract

The utility model discloses an air bag type residual pressure energy recovery device and a sea water desalination system, wherein the device comprises: a core, a left air bag and a right air bag; a cavity is arranged in the core body; one end of the left air bag extends into the cavity, and the other end of the left air bag is provided with a through port for seawater to enter and exit; one end of the right air bag extends into the cavity, and the other end of the right air bag is provided with a through port for seawater to enter and exit; the left air bag is abutted with the right air bag, and the left air bag and the right air bag can be arranged in an expanding mode. In the process of collecting the seawater residual pressure energy, the left air bag and the right air bag are mutually extruded, so that the transfer of the seawater pressure can be realized, and the recovery of the residual pressure energy can be realized; through the mutual extrusion mode of left gasbag and right gasbag, can avoid fluid to mix or leak in the residual pressure energy transmission process to can further improve residual pressure energy recovery efficiency.

Description

An airbag type residual pressure energy recovery device and seawater desalination system

technical field

The present application relates to the technical field of seawater recovery, in particular to an airbag type residual pressure energy recovery device and a seawater desalination system.

Background technique

At present, the shortage of fresh water resources has become a common challenge faced by countries all over the world. my country has a coastline of 18,000 kilometers and is rich in seawater resources. Seawater desalination technology is widely considered to be one of the effective ways to solve the shortage of freshwater resources.

At present, there are three main technologies that have been successfully commercialized in the field of seawater desalination: multi-stage flash evaporation, low-temperature multi-effect distillation, and reverse osmosis. The reverse osmosis method has greatly improved the performance of the reverse osmosis membrane, reducing energy consumption and cost. , so it is the most widely used.

Under different conditions, the reverse osmosis seawater desalination system needs a high pressure of 5.8-8.0MPa to maintain operation, and the residual pressure of the high-pressure concentrated seawater discharged from the membrane module is still as high as 5.5-6.0MPa. It has great recycling value.

Traditional residual pressure energy recovery devices can be divided into centrifugal type and positive displacement type according to the working principle. Among them, the recovery efficiency of the positive displacement residual pressure energy is higher than that of the centrifugal type, so it is more popular in the market. The existing positive displacement residual pressure energy recovery device generally realizes the transmission of residual pressure energy by using mixed liquid (liquid piston) or rod type piston, but these two methods cannot completely isolate different fluids, and there will be a small amount of The fluid mixes or leaks during the process of residual pressure energy transfer, which reduces the recovery efficiency of residual pressure energy.

Utility model content

In view of this, the purpose of this application is to provide an airbag type residual pressure energy recovery device and a seawater desalination system for improving the recovery efficiency of the seawater residual pressure energy recovery device.

In order to achieve the above technical purpose, the first aspect of the present application provides an airbag type residual pressure energy recovery device, including: a core body, a left airbag and a right airbag;

A cavity is arranged in the core;

One end of the left airbag extends into the cavity, and the other end is provided with a port for seawater to enter and exit;

One end of the right airbag extends into the cavity, and the other end is provided with a port for seawater to enter and exit;

The left airbag is in contact with the right airbag, and both are inflatable.

Further, the core is provided with: a high-pressure concentrated seawater inlet, a low-pressure concentrated seawater outlet, a low-pressure seawater inlet, and a high-pressure seawater outlet;

The other end of the left airbag communicates with the high-pressure concentrated seawater inlet and the low-pressure concentrated seawater outlet;

The other end of the right airbag communicates with the low-pressure seawater inlet and the high-pressure seawater outlet.

Further, the inlet of the high-pressure concentrated seawater is provided with a first valve;

The outlet of the low-pressure concentrated seawater is provided with a second valve;

A third valve is provided on the low-pressure seawater inlet;

A fourth valve is provided on the high-pressure seawater outlet.

Further, the first valve and the second valve are controlled by a two-position three-way solenoid valve, so that the first valve and the second valve are alternately opened and closed.

The second aspect of the present application provides a seawater desalination system, including the airbag type residual pressure energy recovery device described in any one of the above.

Further, it also includes: a reverse osmosis seawater desalination membrane group, a freshwater collection tank, a low-pressure concentrated seawater collection tank, a low-pressure pump, a seawater tank, a high-pressure pump and a booster pump;

The reverse osmosis seawater desalination membrane group and the low-pressure concentrated seawater collection box are respectively connected to the other end of the left airbag in the airbag-type residual pressure energy recovery device;

The reverse osmosis seawater desalination membrane group is connected to the other end of the right airbag in the airbag type residual pressure energy recovery device through a booster pump;

The seawater tank is connected to the other end of the right airbag through a low-pressure pump, and connected to the reverse osmosis seawater desalination membrane group through a high-pressure pump;

The fresh water collection box is connected to the reverse osmosis seawater desalination membrane group.

It can be seen from the above technical solutions that this application provides an airbag type residual pressure energy recovery device and a seawater desalination system, the device includes: a core body, a left airbag and a right airbag; a cavity is provided in the core; One end of the airbag extends into the cavity, and the other end is provided with a port for seawater to enter and exit; one end of the right airbag extends into the cavity, and the other end is provided with a port for seawater to enter and exit; the left airbag and the right airbag butt, and the two can be expanded to set. In the process of collecting seawater residual pressure energy, the left airbag and the right airbag squeeze each other, which can realize the transfer of seawater pressure and then realize the recovery of residual pressure energy; Mixing or leakage in the process of pressure energy transmission can further improve the recovery efficiency of residual pressure energy.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is an overall schematic diagram of an airbag-type residual pressure energy recovery device provided in an embodiment of the present application;

Fig. 2 is a schematic diagram of the initial state of the residual pressure energy recovery of an airbag type residual pressure energy recovery device provided by the embodiment of the present application;

Fig. 3 is a schematic diagram of the end state of recovery of residual pressure energy of an airbag type residual pressure energy recovery device provided in the embodiment of the present application;

Fig. 4 is a schematic diagram of the overall structure of a seawater desalination system provided by the embodiment of the present application;

In the picture:

Right airbag 1-1, left airbag 1-2, core body 1-3, first valve 1-4, second valve 1-5, third valve 1-6, fourth valve 1-7, two-position three-way Solenoid valve 1-8;

High-pressure concentrated seawater inlet 2-1, low-pressure concentrated seawater outlet 2-2, low-pressure seawater inlet 2-3, high-pressure seawater outlet 2-4;

Reverse osmosis seawater desalination membrane group 3-1, fresh water collection tank 3-2, low-pressure concentrated seawater collection tank 3-3, low-pressure pump 3-4, seawater tank 3-5, high-pressure pump 3-6, booster pump 3-7 .

Detailed ways

The technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the specification of this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the scope of protection claimed in this application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer " and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, Constructed and operative in a particular orientation and therefore should not be construed as limiting to the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the embodiments of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a Replaceable connection, or integral connection, can be mechanical connection or electrical connection, direct connection or indirect connection through an intermediary, or internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations.

Please refer to Figure 1, the first aspect of the application provided in the embodiment of the application provides an airbag type residual pressure energy recovery device, including: a core 1-3, a left airbag 1-2 and a right airbag 1-1; the core 1-3 is provided with a cavity; one end of the left airbag 1-2 extends into the cavity, and the other end is provided with a port for seawater to enter and exit; one end of the right airbag 1-1 extends into the cavity, and the other end is provided with a port for seawater to enter and exit. Port; the left airbag 1-2 abuts against the right airbag 1-1, and the two can be inflated.

In the process of recovering the residual pressure energy of seawater, the low-pressure seawater can be passed into an airbag first, for example, the low-pressure seawater enters the right airbag 1-1 through the opening of the right airbag 1-1, and then closes the right airbag 1-1 and the high-pressure concentrated seawater enters the left airbag 1-2 through the port of the left airbag 1-2, so that the left airbag 1-2 squeezes and compresses the right airbag 1-1, and transmits the pressure of the high-pressure concentrated seawater Supply low-pressure seawater to realize the recycling of residual pressure energy of high-pressure concentrated seawater; after the low-pressure seawater in the right airbag 1-1 is compressed into high-pressure seawater, open the port of the right airbag 1-1 to allow the internal seawater to flow out.

In this embodiment, in the process of recovering the residual pressure energy of seawater, the fluid will not leak or mix during the transfer process of the residual pressure energy, so that the residual pressure energy can be used more effectively and the recovery efficiency of the residual pressure energy can be improved.

In a more specific embodiment, please refer to Fig. 2 and Fig. 3, the core body 1-3 is provided with: high-pressure concentrated seawater inlet 2-1, low-pressure concentrated seawater outlet 2-2, low-pressure seawater inlet 2-3 and high-pressure seawater Exit 2-4; the other end of the left airbag 1-2 is connected to the high-pressure concentrated seawater inlet 2-1 and the low-pressure concentrated seawater outlet 2-2; the other end of the right airbag 1-1 is connected to the low-pressure seawater inlet 2-3 and the high-pressure seawater outlet 2 -4.

Among them, the high-pressure concentrated seawater inlet 2-1 is provided with a first valve 1-4; the low-pressure concentrated seawater outlet 2-2 is provided with a second valve 1-5; the low-pressure seawater inlet 2-3 is provided with a third valve 1- 6. A fourth valve 1-7 is provided on the high-pressure seawater outlet 2-4. That is, in this embodiment, the opening and closing of each seawater inlet and seawater outlet are controlled by valves. Wherein, the fourth valve 1-7 may be a pressure limiting valve that is automatically opened after reaching a preset pressure.

The specific workflow can be as follows:

As shown in Figure 2, low-pressure seawater enters the right airbag 1-1 through the third valve 1-6 of the low-pressure seawater inlet 2-3, and opens the second valve 1-5 at the same time, so that the discharge of the previous cycle in the left airbag 1-2 The compressed low-pressure concentrated seawater is discharged from the second valve 1-5 of the low-pressure concentrated seawater outlet 2-2; at this time, the first valve 1-4 is in a closed state, and the fourth valve 1-7 is due to the low pressure in the right air bag 1-1. The seawater is also closed if the pressure threshold is not reached.

As shown in Figure 2, when the right airbag 1-1 is filled with low-pressure seawater and the middle and low-pressure concentrated seawater in the left airbag 1-2 is discharged, the first valve 1-4 is opened and the second valve 1-5 is closed.

Afterwards, referring to Fig. 3, the high-pressure concentrated seawater enters the left airbag 1-2 through the first valve 1-4 of the high-pressure concentrated seawater inlet 2-1, so that the left airbag 1-2 squeezes the right airbag 1-1 to increase the low-pressure seawater. Pressed into high-pressure sea water. When the pressure of the seawater in the right airbag 1-1 reaches the set pressure threshold, the fourth valve 1-7 is opened to discharge the high-pressure seawater through the high-pressure seawater outlet 2-4, realizing the recycling of residual pressure energy. After the high-pressure seawater is discharged, the first valve 1-4 is closed, and the fourth valve 1-7 is automatically closed due to pressure drop. Now the low-pressure seawater enters the right airbag 1-1 through the third valve 1-6 again, and enters the next working cycle.

Compared with the traditional positive displacement residual pressure energy recovery device, this scheme realizes the complete isolation of the two pressure exchange fluids during the fluid pressure transmission, avoids the mixing and leakage between the liquids, and reduces the pressure transmission process. Pressure loss effectively improves the recovery efficiency of residual pressure energy.

In another embodiment, the first valve 1-4 and the second valve 1-5 are controlled by a two-position three-way solenoid valve 1-8, so that the first valve 1-4 and the second valve 1-5 are alternately opened Close, that is, when the first valve 1-4 is opened, the second valve 1-5 will be closed accordingly; correspondingly, when the second valve 1-5 is opened, the first valve 1-4 will be closed accordingly.

The second aspect of the present application provides a seawater desalination system, including any one of the above-mentioned airbag-type residual pressure energy recovery devices.

In a more specific embodiment, please refer to Fig. 4, the above seawater desalination system also includes: reverse osmosis seawater desalination membrane group 3-1, fresh water collection box 3-2, low pressure concentrated seawater collection box 3-3, low pressure pump 3- 4. Seawater tank 3-5, high-pressure pump 3-6 and booster pump 3-7; reverse osmosis seawater desalination membrane group 3-1 and low-pressure concentrated seawater collection tank 3-3 are respectively connected to the middle left of the air bag type residual pressure energy recovery device The other end of the airbag 1-2; the reverse osmosis seawater desalination membrane group 3-1 is connected to the other end of the right airbag 1-1 in the airbag residual pressure energy recovery device through the booster pump 3-7; the seawater tank 3-5 is connected through the low-pressure pump 3-4 is connected to the other end of the right air bag 1-1, and is connected to the reverse osmosis seawater desalination membrane group 3-1 through the high pressure pump 3-6; the fresh water collection tank 3-2 is connected to the reverse osmosis seawater desalination membrane group 3-1.

Specifically, the first valve 1-4 and the second valve 1-5 are connected to the reverse osmosis seawater desalination membrane group 3-1 and the low-pressure concentrated seawater collection tank 3-3 through the two-position three-way solenoid valve 1-8. The fourth valve 1-7 on the high-pressure seawater outlet 2-4 is connected to the reverse osmosis seawater desalination membrane group 3-1 through the booster pump 3-7. The seawater tank 3-5 is connected to the third valve 1-6 on the low-pressure seawater inlet 2-3 through the low-pressure pump 3-4, and the seawater tank 3-5 is connected to the reverse osmosis seawater desalination membrane group 3-1 through the high-pressure pump 3-6.

When the system is working, the high-pressure pump 3-6 pumps the seawater in the seawater tank 3-5 into the reverse osmosis seawater desalination membrane group 3-1, and the seawater is divided into fresh water and high-pressure concentrated seawater by the reverse osmosis pressure difference, and the fresh water flows into Fresh water collection tank 3-2; high-pressure concentrated seawater enters the left airbag 1-2 from the high-pressure concentrated seawater inlet 2-1, and compresses the low-pressure seawater in the right airbag 1-1 to pressurize it into high-pressure seawater. After the pressure threshold, it is discharged from the high-pressure seawater outlet 2-4. The discharged high-pressure seawater is further pressurized by the booster pump 3-7, and injected into the reverse osmosis seawater desalination membrane group 3-1 together with the high-pressure seawater pumped out by the high-pressure pump 3-6. After the high-pressure seawater is discharged, the low-pressure seawater in the seawater tank 3-5 is pumped into the right airbag 1-1 from the low-pressure seawater inlet 2-3 by the low-pressure pump 3-4, and squeezes and pushes the left airbag 1-2, so that the low-pressure concentrated seawater flows from the The low-pressure concentrated seawater outlet 2-2 is discharged into the low-pressure concentrated seawater collection tank 3-3 to complete a working cycle.

The above is only the preferred embodiment of the present application, and is not intended to limit the present utility model. Although the present application has been described in detail with reference to examples, for those skilled in the art, it can still carry out the technical scheme described in the foregoing examples. Modifications, or equivalent replacements for some of the technical features, but within the spirit and principles of the application, any modifications, equivalent replacements, improvements, etc., shall be included within the scope of protection of the application.

Claims (6)

1. An airbag type residual pressure energy recovery device, characterized in that it comprises: a core (1-3), a left airbag (1-2) and a right airbag (1-1); The core (1-3) is provided with a cavity; One end of the left airbag (1-2) extends into the cavity, and the other end is provided with a port for seawater to enter and exit; One end of the right airbag (1-1) extends into the cavity, and the other end is provided with a port for seawater to enter and exit; The left airbag (1-2) abuts against the right airbag (1-1), and both are inflatable. 2. The airbag type residual pressure energy recovery device according to claim 1, characterized in that, the core (1-3) is provided with: a high-pressure concentrated seawater inlet (2-1), a low-pressure concentrated seawater outlet (2 -2), low-pressure seawater inlet (2-3) and high-pressure seawater outlet (2-4); The other end of the left airbag (1-2) communicates with the high-pressure concentrated seawater inlet (2-1) and the low-pressure concentrated seawater outlet (2-2); The other end of the right airbag (1-1) communicates with the low-pressure seawater inlet (2-3) and the high-pressure seawater outlet (2-4). 3. The airbag type residual pressure energy recovery device according to claim 2, characterized in that, the high-pressure concentrated seawater inlet (2-1) is provided with a first valve (1-4); The low-pressure concentrated seawater outlet (2-2) is provided with a second valve (1-5); A third valve (1-6) is provided on the low-pressure seawater inlet (2-3); A fourth valve (1-7) is arranged on the high-pressure seawater outlet (2-4). 4. The air bag type residual pressure energy recovery device according to claim 3, characterized in that, the first valve (1-4) and the second valve (1-5) pass through the two-position three-way solenoid valve (1- 8) Controlling so that the first valve (1-4) and the second valve (1-5) open and close alternately. 5. A seawater desalination system, characterized in that it comprises the airbag type residual pressure energy recovery device according to any one of claims 1-4. 6. The seawater desalination system according to claim 5, further comprising: a reverse osmosis seawater desalination membrane group (3-1), a freshwater collection box (3-2), a low-pressure concentrated seawater collection box (3-3 ), low-pressure pump (3-4), seawater tank (3-5), high-pressure pump (3-6) and booster pump (3-7); The reverse osmosis seawater desalination membrane group (3-1) and the low-pressure concentrated seawater collection box (3-3) are respectively connected to the other end of the left airbag (1-2) in the airbag type residual pressure energy recovery device; The reverse osmosis seawater desalination membrane group (3-1) is connected to the other end of the right airbag (1-1) in the airbag type residual pressure energy recovery device through a booster pump (3-7); The seawater tank (3-5) is connected to the other end of the right airbag (1-1) through a low-pressure pump (3-4), and connected to the reverse osmosis seawater desalination membrane group ( 3-1); The fresh water collection box (3-2) is connected to the reverse osmosis seawater desalination membrane group (3-1).