A gravity and air combined energy storage pressure energy recovery device

Abstract

The present application discloses a gravity and air composite energy storage type pressure energy recovery device, which relates to the field of seawater desalination technology, and comprises an exchange module, a phase change module and a power module; the exchange module comprises a cylinder body; the phase change module comprises a boost phase change component and a pressure relief phase change component; the boost phase change component is provided with a high-pressure seawater output pipeline and a low-pressure seawater input pipeline; the pressure relief phase change component is provided with a high-pressure concentrated seawater input pipeline and a pressure relief concentrated seawater output pipeline; the power module is used to drive the phase change module to operate so that the cylinder body switches between different phases; the present application can realize continuous recovery and utilization of residual pressure energy through the cooperation of a boost piston, a pressure relief piston, a connecting rod and a gravity energy storage block when only one cylinder body is used, thereby solving the problem that the existing residual pressure energy recovery device requires multiple parallel cylinder bodies; and cleverly uses gravitational potential energy and air pressure difference energy to improve the efficiency of residual pressure energy recovery.

Description

Technical Field

[0001] The present application relates to the technical field of seawater desalination, and in particular to a gravity and air composite energy storage type pressure energy recovery device. Background Art

[0002] There are two methods of desalination: thermal method and membrane method. Among them, membrane desalination has a dominant position in the global desalination market due to its low energy consumption. When the membrane desalination system is working, the seawater needs to be pressurized to a high pressure of 5.8-8.0MPa, and the residual pressure of the concentrated seawater obtained after desalination is still as high as 5.0-6.5MPa. If it is directly discharged into the natural environment, this part of the energy will be wasted in vain. Therefore, it is extremely necessary to add a residual pressure energy recovery device to the reverse osmosis membrane desalination system.

[0003] Traditional residual pressure energy recovery devices can be divided into centrifugal and positive displacement types according to their working principles. Among them, the positive displacement residual pressure energy recovery device uses the incompressibility of the fluid to achieve direct energy transfer between high-pressure concentrated seawater and low-pressure seawater. Its recovery efficiency is as high as over 90%, which is much higher than the centrifugal residual pressure energy recovery device, so it is more popular in the market. However, the traditional positive displacement residual pressure energy recovery device requires multiple cylinders in parallel to achieve the conversion of different flow phases of the fluid, and requires multiple connecting pipes to cooperate with seawater pumps to control the in and out of pressurized seawater. The discharge speed of the depressurized seawater is slow and the working efficiency is low. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a gravity and air composite energy storage type pressure energy recovery device to solve the technical problems of the traditional positive displacement residual pressure energy recovery device requiring multiple connecting pipes and seawater pumps to control the inlet and outlet of pressurized seawater, and the slow discharge speed of depressurized seawater and low working efficiency.

[0005] In order to achieve the above technical purpose, the present application provides a gravity and air composite energy storage type pressure energy recovery device, including an exchange module, a phase change module and a power module;

[0006] The exchange module includes a cylinder body;

[0007] The cylinder body is provided with a mutually independent pressurizing chamber, a pressure relief chamber and a gravity energy storage chamber;

[0008] The boosting chamber is arranged above the gravity energy storage chamber, and a boosting piston is arranged therein;

[0009] The boost chamber is provided with a boost outlet and a boost inlet;

[0010] A pressure limiting valve is installed on the boost outlet;

[0011] A one-way valve is installed on the boost inlet;

[0012] The pressure relief chamber is provided with a pressure relief inlet and outlet;

[0013] The pressure relief chamber is arranged below the gravity energy storage chamber, and a pressure relief piston is arranged therein;

[0014] The boost piston and the pressure relief piston are fixedly connected via a connecting rod to achieve synchronous movement;

[0015] A gravity energy storage block is installed in the gravity energy storage chamber;

[0016] The gravity energy storage block is connected to the connecting rod portion passing through the gravity energy storage chamber, and moves synchronously with the connecting rod;

[0017] The phase-changing module includes a pressure-increasing phase-changing component and a pressure-relieving phase-changing component;

[0018] The boost phase-changing assembly is installed above each of the cylinder bodies;

[0019] The boost phase-changing assembly is provided with a high-pressure seawater output pipeline and a low-pressure seawater input pipeline;

[0020] The pressure relief phase-changing assembly is installed below each of the cylinder bodies;

[0021] The pressure relief phase-changing component is provided with a high-pressure concentrated seawater input pipeline and a pressure relief concentrated seawater output pipeline;

[0022] The power module is used to drive the phase change module to operate so that the cylinder body switches between different phases;

[0023] When the cylinder body switches from the first phase to the second phase, the boost outlet of the boost chamber is connected to the high-pressure seawater output pipeline of the boost phase-changing component, and the pressure relief inlet and outlet of the pressure relief chamber is connected to the high-pressure concentrated seawater input pipeline;

[0024] When the cylinder body switches from the second phase to the first phase, the boost inlet of the boost chamber is connected to the low-pressure seawater input pipeline of the boost phase-changing component, and the pressure relief inlet and outlet of the pressure relief chamber are connected to the pressure relief concentrated seawater output pipeline of the pressure relief phase-changing component.

[0025] Further, the number of pairs of the cylinders is 2n pairs;

[0026] The plurality of cylinders are distributed in a circumference;

[0027] The number of the high-pressure seawater output pipeline, the high-pressure concentrated seawater input pipeline, the low-pressure seawater input pipeline and the pressure-relieved concentrated seawater output pipeline is 2n;

[0028] Wherein, n≥1 and is an integer.

[0029] Further, the n is 1;

[0030] There are four cylinders, which are distributed circumferentially at intervals of 90°;

[0031] The number of the high-pressure seawater output pipeline, the high-pressure concentrated seawater input pipeline, the low-pressure seawater input pipeline and the pressure-relieved concentrated seawater output pipeline are all two.

[0032] Furthermore, the boost phase-changing component includes a boost phase-changing partition and a boost phase-changing device;

[0033] The boost phase-changing partition plate is provided with a plurality of boost communication ports;

[0034] A plurality of the boost communication ports are distributed around the central circumference of the boost phase-changing partition plate;

[0035] The power module is connected to the boost phase-changing partition plate, and is used to drive the boost phase-changing partition plate to rotate;

[0036] The booster phase converter includes the high-pressure seawater output pipeline and the low-pressure seawater input pipeline;

[0037] When the boost phase-changing partition plate rotates, the high-pressure seawater output pipeline and the low-pressure seawater input pipeline can be connected to the boost communication port one by one;

[0038] The portion between the adjacent pressurization communication ports on the pressurization phase-changing partition plate can form a seal for the high-pressure seawater output pipeline or the low-pressure seawater input pipeline.

[0039] Furthermore, the pressure relief phase-changing component includes a pressure relief phase-changing partition plate and a pressure relief phase-changing device;

[0040] The pressure relief phase-changing partition plate is provided with a plurality of pressure relief communication ports;

[0041] The plurality of pressure relief communication ports are distributed around the central circumference of the pressure relief phase-changing partition plate;

[0042] The power module is connected to the pressure relief phase-changing partition plate, and is used to drive the pressure relief phase-changing partition plate to rotate;

[0043] The pressure relief phase converter comprises the high-pressure concentrated seawater input pipeline and the pressure relief concentrated seawater output pipeline;

[0044] The high-pressure concentrated seawater input pipeline and the pressure-relief concentrated seawater output pipeline can be connected to the pressure-relief communication port one by one when the pressure-relief phase-changing partition plate rotates;

[0045] The portion of the pressure relief phase-changing partition plate located between the adjacent pressure relief communication ports can seal the pressure relief concentrated seawater output pipeline and the high-pressure concentrated seawater input pipeline.

[0046] Furthermore, there are multiple high-pressure seawater output pipelines and multiple low-pressure seawater input pipelines;

[0047] The booster phase converter also includes a high-pressure seawater output main pipeline and a low-pressure seawater input main pipeline;

[0048] A plurality of the high-pressure seawater output pipelines are connected to the high-pressure seawater output main pipeline;

[0049] A plurality of the low-pressure seawater input pipelines are connected to the low-pressure seawater input main pipeline.

[0050] Furthermore, there are multiple high-pressure concentrated seawater input pipelines and multiple pressure-relieved concentrated seawater output pipelines;

[0051] The pressure relief phase converter also includes a high-pressure concentrated seawater input main pipeline and a pressure relief concentrated seawater output main pipeline;

[0052] A plurality of the high-pressure concentrated seawater input pipelines are connected to the high-pressure concentrated seawater input main pipeline;

[0053] A plurality of the pressure-relieved concentrated seawater output pipelines are connected to the pressure-relieved concentrated seawater output main pipeline.

[0054] Furthermore, the pressurization connecting port and the pressure relief connecting port are both arc-shaped connecting ports.

[0055] Furthermore, a pressure-increasing partition and a pressure-relieving partition are provided in the cylinder body;

[0056] The pressurization partition and the pressure relief partition divide the space in the cylinder into three chambers;

[0057] The chamber located above the pressurization partition forms the pressurization chamber;

[0058] The chamber located between the pressurization partition and the pressure relief partition forms the gravity energy storage chamber;

[0059] The chamber below the pressure relief baffle forms the pressure relief chamber;

[0060] The connecting rod passes through the pressure-increasing partition and the pressure-relieving partition.

[0061] Furthermore, grooves are provided on the top of the boost baffle and the bottom of the pressure relief baffle for storing air energy.

[0062] It can be seen from the above technical solutions that the gravity and air composite energy storage pressure energy recovery device designed in this application has the following beneficial effects:

[0063] 1. In the case of using only one cylinder, the present application can realize continuous recovery and utilization of residual pressure energy through the cooperation of the booster piston, the pressure relief piston, the connecting rod and the gravity energy storage block, thereby solving the problem that the existing residual pressure energy recovery device requires multiple parallel cylinders to realize residual pressure energy recovery.

[0064] 2. The gravitational potential energy and air pressure difference energy are cleverly used. When the booster piston pushes and squeezes the low-pressure seawater in the booster chamber to increase its pressure to high-pressure seawater and output it through the high-pressure seawater output pipe, a negative pressure area will be formed in the chamber below the booster piston; when the booster chamber is switched to be connected with the low-pressure seawater input pipe, the low-pressure seawater is sucked in by utilizing the air pressure difference and gravitational potential energy, thereby reducing the energy consumption of the seawater pump. Under the gravity action of the gravity energy storage block and the low-pressure seawater entering the booster chamber and the high pressure action of the air in the pressure relief chamber, the discharge speed of the decompressed concentrated seawater in the pressure relief chamber is increased, effectively improving the efficiency of residual pressure energy recovery.

[0065] 3. When the device is working, the cylinder body remains stationary, and the power module drives the phase-changing module to operate. Compared with the traditional residual pressure energy recovery device that drives the cylinder body to rotate, the power consumption of the external motor is significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0067] Figure 1 A schematic diagram of a cylinder of a gravity and air composite energy storage pressure energy recovery device provided in the present application in a first phase;

[0068] Figure 2 A schematic diagram of a cylinder of a gravity and air composite energy storage pressure energy recovery device provided in the present application in the second phase;

[0069] Figure 3 A schematic diagram of the coordination structure of a boost phase-changing partition and a boost phase-changing device of a gravity and air composite energy storage pressure energy recovery device provided in this application;

[0070] Figure 4 A schematic diagram of the coordination structure of a pressure relief phase-changing partition and a pressure relief phase-changing device of a gravity and air composite energy storage pressure energy recovery device provided in this application;

[0071] Figure 5A schematic diagram of the structure of a booster inverter of a gravity and air composite energy storage pressure energy recovery device provided in this application;

[0072] Figure 6 A schematic diagram of the structure of a pressure relief phase converter of a gravity and air composite energy storage pressure energy recovery device provided in this application;

[0073] In the figure: 1.1, one-way valve; 1.2, pressure limiting valve; 2, boosting chamber; 3, boosting piston; 4.1, boosting diaphragm; 4.2, pressure relief diaphragm; 5, sealing ring; 6, connecting rod; 7, gravity energy storage chamber; 8, gravity energy storage block; 9, pressure relief chamber; 10, pressure relief piston; 11.1, boosting phase-changing diaphragm; 11.2, pressure relief phase-changing diaphragm; 12.1, first high-pressure seawater output pipeline; 12.2, second high-pressure seawater output pipeline; 12. 3. First low-pressure seawater input pipeline; 12.4. Second low-pressure seawater input pipeline; 12.5. First high-pressure concentrated seawater input pipeline; 12.6. Second high-pressure concentrated seawater input pipeline; 12.7. First pressure-relief concentrated seawater output pipeline; 12.8. Second pressure-relief concentrated seawater output pipeline; 13. High-pressure seawater output main pipeline; 14. Low-pressure seawater input main pipeline; 15. High-pressure concentrated seawater input main pipeline; 16. Pressure-relief concentrated seawater output main pipeline. DETAILED DESCRIPTION

[0074] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection of the embodiments of the present application.

[0075] 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", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0076] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a replaceable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0077] The embodiment of the present application discloses a gravity and air composite energy storage type pressure energy recovery device.

[0078] See also Figure 1 as well as Figure 2 , an embodiment of a gravity and air composite energy storage type pressure energy recovery device provided in the embodiments of the present application includes:

[0079] Switching module, phase change module and power module.

[0080] The exchange module comprises a cylinder body; the cylinder body is provided with a pressurizing chamber 2, a pressure relief chamber 9 and a gravity energy storage chamber 7 which are independent of each other.

[0081] The boosting chamber 2 is arranged above the gravity energy storage chamber 7, and a boosting piston 3 is arranged inside it; a boosting outlet and a boosting inlet are arranged on the boosting chamber 2; a pressure relief inlet and outlet are arranged on the pressure relief chamber 9; a pressure limiting valve 1.2 is installed on the boosting outlet, and output is made after reaching the set pressure; a one-way valve 1.1 is installed on the boosting inlet, which is a one-way conduction design that can only allow entry but not exit.

[0082] The pressure relief chamber 9 is arranged below the gravity energy storage chamber 7, and a pressure relief piston 10 is arranged therein; the booster piston 3 and the pressure relief piston 10 are fixedly connected by a connecting rod 6 to achieve synchronous movement; a gravity energy storage block 8 is installed in the gravity energy storage chamber 7. The gravity energy storage block 8 is connected to the connecting rod 6 that passes through the gravity energy storage chamber 7, and moves synchronously with the connecting rod 6.

[0083] The phase-changing module includes a pressure-increasing phase-changing component and a pressure-relieving phase-changing component.

[0084] The boost phase-changing assembly is installed above the cylinder body; the boost phase-changing assembly is provided with a high-pressure seawater output pipeline and a low-pressure seawater input pipeline; the pressure relief phase-changing assembly is installed below each cylinder body; the pressure relief phase-changing assembly is provided with a high-pressure concentrated seawater input pipeline and a pressure relief concentrated seawater output pipeline.

[0085] As for the power module, it is an external motor module used to drive the phase change module to operate so that the cylinder body switches between different phases.

[0086] When the cylinder body switches from the first phase to the second phase, the boost outlet of the boost chamber 2 is connected to the high-pressure seawater output pipeline of the boost phase-changing component, and the pressure relief inlet and outlet of the pressure relief chamber 9 are connected to the high-pressure concentrated seawater input pipeline; when the cylinder body switches from the first phase to the second phase, the recovery of the residual pressure energy of the high-pressure concentrated seawater is completed, and the low-pressure seawater is pressurized into high-pressure seawater.

[0087] When the cylinder body switches from the second phase to the first phase, the boost inlet of the boost chamber 2 is connected to the low-pressure seawater input pipeline of the boost phase-changing component, and the pressure relief inlet and outlet of the pressure relief chamber 9 are connected to the pressure relief concentrated seawater output pipeline of the pressure relief phase-changing component; the cylinder body moves from the second phase to the first phase, completing the discharge of the pressure relief concentrated seawater and the filling of the low-pressure seawater.

[0088] The gravity energy storage block 8 of the present application is made of high-density material and can be sleeved on the connecting rod 6, or fixedly connected to the connecting rod 6 by other connecting and fixing methods; the gravity energy storage block 8 stores gravity potential energy when the cylinder body is converted from the first phase to the second phase; the gravity energy storage block 8 releases the stored gravity potential energy when the cylinder body is converted from the second phase to the first phase, so that the depressurized concentrated seawater is quickly discharged from the pressure relief chamber 9 under the joint push of the low-pressure seawater, high-pressure air and the gravity energy storage block 8.

[0089] The pressurization chamber 2, the pressure relief chamber 9 and the gravity energy storage chamber 7 of the present application are independent of each other and remain in a sealed state, and there is no gas exchange between them.

[0090] The gravity and air composite energy storage pressure energy recovery device designed in this application has the following beneficial effects:

[0091] 1. In the case of using only one cylinder, the present application can realize continuous recovery and utilization of residual pressure energy through the cooperation of the booster piston 3, the pressure relief piston 10, the connecting rod 6 and the gravity energy storage block 8, thereby solving the problem that the existing residual pressure energy recovery device requires multiple parallel cylinders to realize residual pressure energy recovery.

[0092] 2. The gravitational potential energy and air pressure difference energy are cleverly used. When the boosting piston 3 pushes and squeezes the low-pressure seawater in the boosting chamber 2 to increase its pressure to high-pressure seawater and output it through the high-pressure seawater output pipe, a negative pressure area will be formed in the cavity below the boosting piston 3; when the boosting chamber 2 is switched to be connected with the low-pressure seawater input pipe, the low-pressure seawater is sucked in by utilizing the air pressure difference and the gravitational potential energy, thereby reducing the energy consumption of the seawater pump. Under the gravity action of the gravity energy storage block 8 and the low-pressure seawater entering the boosting chamber 2 and the high pressure action of the air in the pressure relief chamber 9, the discharge speed of the decompressed concentrated seawater in the pressure relief chamber 9 is increased, thereby effectively improving the recovery efficiency of the residual pressure energy.

[0093] 3. When the device is working, the cylinder body remains stationary, and the power module drives the phase-changing module to operate. Compared with the traditional residual pressure energy recovery device that drives the cylinder body to rotate, the power consumption of the external motor is significantly reduced.

[0094] The above is the first embodiment of a gravity and air composite energy storage type pressure energy recovery device provided in the embodiment of the present application. The following is the second embodiment of a gravity and air composite energy storage type pressure energy recovery device provided in the embodiment of the present application. For details, please refer to Figures 1 to 6 .

[0095] Based on the solution of the above embodiment 1:

[0096] Furthermore, in order to better improve the residual pressure energy recovery efficiency, the number of cylinder bodies is designed to be 2n pairs, one pair is two cylinder bodies; and the multiple cylinder bodies are distributed in a circle.

[0097] Correspondingly, the number of high-pressure seawater output pipelines, high-pressure concentrated seawater input pipelines, low-pressure seawater input pipelines and pressure-relieved concentrated seawater output pipelines is 2n; wherein n≥1 and is an integer.

[0098] Furthermore, taking n as 1 as an example, two pairs of four cylinders are designed, and the four cylinders are distributed in a circle with an interval of 90 degrees.

[0099] Correspondingly, the number of the high-pressure seawater output pipeline, the high-pressure concentrated seawater input pipeline, the low-pressure seawater input pipeline and the pressure-relieved concentrated seawater output pipeline are all 2.

[0100] For better explanation, the two high-pressure seawater output pipelines are respectively recorded as the first high-pressure seawater output pipeline 12.1 and the second high-pressure seawater output pipeline 12.2; the two high-pressure concentrated seawater input pipelines are recorded as the first high-pressure concentrated seawater input pipeline 12.5 and the second high-pressure concentrated seawater input pipeline 12.6; the two low-pressure seawater input pipelines are recorded as the first low-pressure seawater input pipeline 12.3 and the second low-pressure seawater input pipeline 12.4; and the two pressure-relief concentrated seawater output pipelines are recorded as the first pressure-relief concentrated seawater output pipeline 12.7 and the second pressure-relief concentrated seawater output pipeline 12.8.

[0101] The four cylinders of the present application are evenly placed on the circumference, and the four cylinders operate simultaneously and independently of each other. Two adjacent cylinders are in different phases, and two cylinders 180° apart are in the same phase. That is, when two cylinders switch from the first phase to the second phase, the other two cylinders switch from the second phase to the first phase.

[0102] Furthermore, the design of the boost phase-changing component includes a boost phase-changing partition 11.1 and a boost phase-changing device.

[0103] The boost phase-changing partition plate 11.1 is provided with a plurality of boost communication ports; the plurality of boost communication ports are distributed around the central circumference of the boost phase-changing partition plate 11.1.

[0104] The power module is connected to the boost phase-changing partition 11.1 to drive the boost phase-changing partition 11.1 to rotate; the boost phase-changing device includes a high-pressure seawater output pipeline and a low-pressure seawater input pipeline. Taking the example of two high-pressure seawater output pipelines and two low-pressure seawater input pipelines, the boost connection ports are designed to be four accordingly.

[0105] When the boost phase-changing partition 11.1 rotates, the high-pressure seawater output pipeline and the low-pressure seawater input pipeline can be connected to the boost connecting ports one by one; the part between adjacent boost connecting ports on the boost phase-changing partition 11.1 can form a closure for the high-pressure seawater output pipeline or the low-pressure seawater input pipeline, and the closed area plays a role in blocking the flow of fluid.

[0106] Furthermore, the design of the pressure relief phase-changing component includes a pressure relief phase-changing partition 11.2 and a pressure relief phase-changing device.

[0107] The pressure relief phase-changing partition plate 11.2 is provided with a plurality of pressure relief communication ports; the plurality of pressure relief communication ports are distributed around the central circumference of the pressure relief phase-changing partition plate 11.2.

[0108] The power module is connected to the pressure relief phase change partition 11.2 to drive the pressure relief phase change partition 11.2 to rotate; the pressure relief phase changer includes a high-pressure concentrated seawater input pipeline and a pressure relief concentrated seawater output pipeline. Taking the number of high-pressure concentrated seawater input pipelines and pressure relief concentrated seawater output pipelines as two, the number of pressure relief connection ports is four.

[0109] When the pressure relief phase-changing partition 11.2 rotates, the high-pressure concentrated seawater input pipeline and the pressure relief concentrated seawater output pipeline can be connected to the pressure relief connecting ports one by one; the portion of the pressure relief phase-changing partition 11.2 located between adjacent pressure relief connecting ports can form a closure for the pressure relief concentrated seawater output pipeline and the high-pressure concentrated seawater input pipeline, and the closed area plays a role in blocking the flow of fluid.

[0110] In the present application, the boost phase-changing partition 11.1, the pressure-relief phase-changing partition 11.2, the boost phase-changing device and the pressure-relief phase-changing device are rotatably mounted and synchronously rotated by power drive, while the cylinder body is fixedly mounted.

[0111] Furthermore, taking the high-pressure seawater output pipeline and the low-pressure seawater input pipeline as an example, both have multiple designs:

[0112] The boost phase-changing component also includes a high-pressure seawater output main pipeline 13 and a low-pressure seawater input main pipeline 14 ; multiple high-pressure seawater output pipelines are connected to the high-pressure seawater output main pipeline 13 ; multiple low-pressure seawater input pipelines are connected to the low-pressure seawater input main pipeline 14 .

[0113] Specifically, taking the high-pressure seawater output pipeline and the low-pressure seawater input pipeline as two designs as examples, the high-pressure seawater flows into the first high-pressure seawater output pipeline 12.1 and the second high-pressure seawater output pipeline 12.2 and converges to the high-pressure seawater output main pipeline 13 before entering the seawater desalination process; the low-pressure seawater is diverted from the low-pressure seawater input main pipeline 14 to the first low-pressure seawater input pipeline 12.3 and the second low-pressure seawater input pipeline 12.4 before entering the boosting chamber 2 for residual pressure energy recovery. By setting up the main pipeline for convergence, the overall structure is more compact.

[0114] Furthermore, taking the high-pressure concentrated seawater input pipeline and the pressure-relief concentrated seawater output pipeline as an example, both have multiple designs:

[0115] The pressure relief phase-changing component also includes a high-pressure concentrated seawater input main pipeline 15 and a pressure relief concentrated seawater output main pipeline 16; multiple high-pressure concentrated seawater input pipelines are connected to the high-pressure concentrated seawater input main pipeline 15; multiple pressure relief concentrated seawater output pipelines are connected to the pressure relief concentrated seawater output main pipeline 16.

[0116] Specifically, taking the high-pressure concentrated seawater input pipeline and the pressure-relief concentrated seawater output pipeline as two designs as examples, the high-pressure concentrated seawater is diverted from the high-pressure concentrated seawater input main pipeline 15 into the first high-pressure concentrated seawater input pipeline 12.5 and the second high-pressure concentrated seawater input pipeline 12.6 and then enters the pressure relief chamber 9 for residual pressure energy recovery; the pressure-relief concentrated seawater flows into the first pressure-relief concentrated seawater output pipeline 12.7 and the second pressure-relief concentrated seawater output pipeline 12.8 and converges to the pressure-relief concentrated seawater output main pipeline 16 and then is discharged together. By setting up the main pipeline for convergence, the overall structure is more compact.

[0117] Furthermore, both the pressure-increasing connecting port and the pressure-relieving connecting port are arc-shaped connecting ports; the arc-shaped design of the connecting ports can prolong the pressure transmission time of the fluid.

[0118] Furthermore, a boost partition 4.1 and a pressure relief partition 4.2 are provided in the cylinder body; the boost partition 4.1 and the pressure relief partition 4.2 divide the space in the cylinder body into three chambers; the chamber located above the boost partition 4.1 forms a boost chamber 2; the chamber located between the boost partition 4.1 and the pressure relief partition 4.2 forms a gravity energy storage chamber 7; the chamber located below the pressure relief partition 4.2 forms a pressure relief chamber 9; the connecting rod 6 passes through the boost partition 4.1 and the pressure relief partition 4.2, and is connected to the boost piston 3 and the pressure relief piston 10 as a whole.

[0119] Furthermore, sealing rings 5 ​​are provided at the connection between the connecting rod 6 and the pressurization partition 4.1 and at the connection between the connecting rod 6 and the pressure relief partition 4.2 to ensure the airtightness of the chamber.

[0120] Furthermore, a groove is provided at the top of the boosting partition 4.1 and the bottom of the pressure relief partition 4.2 for air energy storage. In the initial state, that is, when the cylinder body is in the first phase, the boosting piston 3 and the pressure relief piston 10 are respectively located at the bottom of the boosting chamber 2 and the pressure relief chamber 9, and the air in the boosting chamber 2 is stored in the groove at the boosting partition 4.1, and the air in the pressure relief chamber 9 fills the entire cavity. When the cylinder body is in the second phase, the boosting piston 3 is at the top of the boosting chamber 2, and there is a certain vacuum negative pressure in the boosting chamber 2, which helps to suck low-pressure seawater into the boosting chamber 2 and reduce the power consumption of the seawater pump; the pressure relief piston 10 is at the top of the pressure relief chamber 9, compressing the air in the pressure relief chamber 9 into the groove at the pressure relief partition 4.2, forming a high-pressure state, which helps to discharge the pressure-relieved concentrated seawater in the pressure relief chamber 9.

[0121] The working principle of the present application is explained by taking two cylinders in the same phase as an example.

[0122] like Figure 1 As shown, the boost piston 3 and the pressure relief piston 10 of the two cylinders in the first phase are respectively located at the bottom of the boost chamber 2 and the pressure relief chamber 9, and the gravity energy storage block 8 is located at the bottom of the gravity energy storage chamber 7; the boost chamber 2 is filled with low-pressure seawater; the boost chambers 2 of the two cylinders are respectively connected to the first high-pressure seawater output pipeline 12.1 and the second high-pressure seawater output pipeline 12.2 of the boost phase converter, and the pressure relief chambers 9 of the two cylinders are respectively connected to the first high-pressure concentrated seawater input pipeline 12.5 and the second high-pressure concentrated seawater input pipeline 12.6 of the pressure relief phase converter.

[0123] Before the device starts working, the closed area of ​​the boosting phase-changing partition 11.1 can close the first high-pressure seawater output pipeline 12.1, the second high-pressure seawater output pipeline 12.2, the first low-pressure seawater input pipeline 12.3 and the second low-pressure seawater input pipeline 12.4 of the boosting phase-changing device; at the same time, the closed area of ​​the pressure-relief phase-changing partition 11.2 can close the first high-pressure concentrated seawater input pipeline 12.5, the second high-pressure concentrated seawater input pipeline 12.6, the first pressure-relief concentrated seawater output pipeline 12.7 and the second pressure-relief concentrated seawater output pipeline 12.8 of the pressure-relief phase-changing device.

[0124] When the device starts working, the power module continuously drives the boost phase-changing partition 11.1 and the pressure relief phase-changing partition 11.2 to rotate slowly together, so that the pipeline inlets and outlets of the boost phase-changing device enter the boost connecting port position from the closed area of ​​the boost phase-changing partition 11.1, and are connected with the boost chambers 2 of the four cylinders; at the same time, the pipeline inlets and outlets of the pressure relief phase-changing device enter the pressure relief connecting port position from the closed area of ​​the pressure relief phase-changing partition 11.2, and are connected with the pressure relief chambers 9 of the four cylinders.

[0125] High-pressure concentrated seawater enters the pressure relief chamber 9 through the first high-pressure concentrated seawater input pipeline 12.5 and the second high-pressure concentrated seawater input pipeline 12.6, pushing the pressure relief piston 10 to move upward; the pressure relief piston 10 drives the gravity energy storage block 8 and the boosting piston 3 to move upward together through the connecting rod 6, and the boosting piston 3 pushes the low-pressure seawater in the boosting chamber 2 upward, and part of the pressure energy of the high-pressure concentrated seawater is converted into the gravitational potential energy of the gravity energy storage block 8, and the other part is transferred to the low-pressure seawater, so that the pressure of the low-pressure seawater is increased to become high-pressure seawater. When the pressure of the high-pressure seawater reaches the set value of the pressure limiting valve 1.2, the pressure limiting valve 1.2 opens, and the high-pressure seawater enters the first high-pressure seawater output pipeline 12.1 and the second high-pressure seawater output pipeline 12.2 through the pressure limiting valve 1.2, providing high-pressure seawater for the subsequent reverse osmosis seawater desalination process. The pressure energy of the high-pressure concentrated seawater in the pressure relief chamber 9 is transferred to become pressure relief concentrated seawater. When all the high-pressure seawater in the boosting chamber 2 flows into the first high-pressure seawater output pipeline 12.1 and the second high-pressure seawater output pipeline 12.2, the pressure relief chamber 9 is filled with decompressed concentrated seawater, completing the pressure recovery of the high-pressure concentrated seawater.

[0126] At this time, the two cylinders reach Figure 2 In the second phase shown, the boost piston 3 and the pressure relief piston 10 are located at the top of the boost chamber 2 and the pressure relief chamber 9 respectively, and the gravity energy storage block 8 is located at the top of the gravity energy storage chamber 7; the pressure relief chamber 9 is filled with pressure relief concentrated seawater; under the continuous drive of the power module, the closed areas of the boost phase-changing baffle 11.1 and the pressure relief phase-changing baffle 11.2 just turn to the inlet and outlet positions of the four pipes of the respective corresponding phase converters. At this time, the power module simultaneously drives the boost phase-changing baffle 11.1, the boost phase converter, the pressure relief phase converter and the pressure relief phase-changing baffle 11.2 to rotate synchronously by 90°, so that the boost chamber 2 of the above two cylinders is connected to the first low-pressure seawater input pipeline 12.3 and the second low-pressure seawater input pipeline 12.4, and the pressure relief chamber 9 is connected to the first pressure relief concentrated seawater output pipeline 12.7 and the second pressure relief concentrated seawater output pipeline 12.8. The power module continuously drives the boost commutation partition 11.1 and the pressure relief commutation partition 11.2 to rotate slowly together, so that the four pipes of the boost commutator and the pressure relief commutator gradually move from the closed area of ​​the boost commutation partition 11.1 and the pressure relief commutation partition 11.2 to the connecting port position, so that each pipe is connected to the cylinder body.

[0127] The boost piston 3 moves downward under the gravity of the gravity energy storage block 8 and the negative pressure of the air in the boost chamber 2, and the low-pressure seawater in the first low-pressure seawater input pipe 12.3 and the second low-pressure seawater input pipe 12.4 is sucked into the boost chamber 2 through the one-way valve 1.1; at the same time, the pressure relief piston 10 discharges the pressure relief concentrated seawater in the pressure relief chamber 9 out of the cylinder through the first pressure relief concentrated seawater output pipe 12.7 and the second pressure relief concentrated seawater output pipe 12.8 under the gravity of the gravity energy storage block 8 and the low-pressure seawater entering the boost chamber 2 and the high pressure of the air in the pressure relief chamber 9. When the pressure relief concentrated seawater in the pressure relief chamber 9 is completely discharged, the boost chamber 2 is filled with low-pressure seawater, and the two cylinders reach the first phase again. At this time, under the continuous drive of the power module, the closed areas of the boost phase-changing partition 11.1 and the pressure relief phase-changing partition 11.2 just turn to the inlet and outlet positions of the four pipes of their respective phase converters. At this time, the power simultaneously drives the boost phase-changing partition 11.1, the boost phase-changing device, the pressure relief phase-changing device and the pressure relief phase-changing partition 11.2 to rotate synchronously by 90 degrees, so that the boost chambers 2 of the above two cylinders are connected to the first high-pressure seawater output pipeline 12.1 and the second high-pressure seawater output pipeline 12.2 respectively, and the pressure relief chamber 9 is connected to the first high-pressure concentrated seawater input pipeline 12.5 and the second high-pressure concentrated seawater input pipeline 12.6 respectively; thereby, the work of the first phase is repeated, and the continuous recovery of the residual pressure energy is realized.

[0128] Through the cooperation of four cylinders and the phase-changing module, the residual pressure energy can be continuously recovered and the external input electric energy can be reduced. In addition, the residual pressure energy can be recovered and utilized independently in each cylinder, which solves the problem that the existing residual pressure energy recovery device requires multiple cylinders in parallel to achieve residual pressure energy recovery. The gravitational potential energy and the air pressure difference can accelerate the speed of low-pressure seawater input into the boosting chamber 2 and the speed of decompression concentrated seawater output from the pressure relief chamber 9, which greatly improves the recovery efficiency of the residual pressure energy while saving power consumption.

[0129] The above is a detailed introduction to a gravity and air composite energy storage pressure energy recovery device provided by the present application. For a person skilled in the art, according to the idea of ​​the embodiments of the present application, there may be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A gravity and air composite energy storage pressure energy recovery device, characterized in that: Including switching module, phase switching module and power module; The exchange module includes a cylinder body; The cylinder body is provided with a mutually independent pressurizing chamber (2), a pressure relief chamber (9) and a gravity energy storage chamber (7); The boosting chamber (2) is arranged above the gravity energy storage chamber (7), and a boosting piston (3) is arranged therein; The boost chamber (2) is provided with a boost outlet and a boost inlet; A pressure limiting valve (1.2) is installed on the boost outlet; A one-way valve (1.1) is installed on the boost inlet; The pressure relief chamber (9) is provided with a pressure relief inlet and outlet; The pressure relief chamber (9) is arranged below the gravity energy storage chamber (7), and a pressure relief piston (10) is arranged therein; The boost piston (3) and the pressure relief piston (10) are fixedly connected via a connecting rod (6) to achieve synchronous movement; A gravity energy storage block (8) is installed in the gravity energy storage chamber (7); The gravity energy storage block (8) is connected to the portion of the connecting rod (6) passing through the gravity energy storage chamber (7), and moves synchronously with the connecting rod (6); The phase-changing module includes a pressure-increasing phase-changing component and a pressure-relieving phase-changing component; The boost phase-changing assembly is installed above each of the cylinder bodies; The boost phase-changing assembly is provided with a high-pressure seawater output pipeline and a low-pressure seawater input pipeline; The pressure relief phase-changing assembly is installed below each of the cylinder bodies; The pressure relief phase-changing component is provided with a high-pressure concentrated seawater input pipeline and a pressure relief concentrated seawater output pipeline; The power module is used to drive the phase change module to operate so that the cylinder body switches between different phases; When the cylinder body switches from the first phase to the second phase, the boost outlet of the boost chamber (2) is connected to the high-pressure seawater output pipeline of the boost phase-changing component, and the pressure relief inlet and outlet of the pressure relief chamber (9) is connected to the high-pressure concentrated seawater input pipeline; When the cylinder body switches from the second phase to the first phase, the boost inlet of the boost chamber (2) is connected to the low-pressure seawater input pipeline of the boost phase-changing component, and the pressure relief inlet and outlet of the pressure relief chamber (9) are connected to the pressure relief concentrated seawater output pipeline of the pressure relief phase-changing component; The boost phase-changing component comprises a boost phase-changing partition plate (11.1) and a boost phase-changing device; The boost phase-changing partition plate (11.1) is provided with a plurality of boost communication ports; A plurality of the boost communication ports are distributed around the central circumference of the boost phase-changing partition plate (11.1); The power module is connected to the boost phase-changing partition plate (11.1) and is used to drive the boost phase-changing partition plate (11.1) to rotate; The booster phase converter includes the high-pressure seawater output pipeline and the low-pressure seawater input pipeline; When the pressurization phase-changing partition plate (11.1) rotates, the high-pressure seawater output pipeline and the low-pressure seawater input pipeline can be connected to the pressurization communication port in a one-to-one correspondence. The portion between the adjacent boosting communication ports on the boosting phase-changing partition plate (11.1) can seal the high-pressure seawater output pipeline or the low-pressure seawater input pipeline; The pressure relief phase-changing component comprises a pressure relief phase-changing partition plate (11.2) and a pressure relief phase-changing device; The pressure relief phase-changing partition plate (11.2) is provided with a plurality of pressure relief communication ports; The plurality of pressure relief communication ports are distributed around the central circumference of the pressure relief phase-changing partition plate (11.2); The power module is connected to the pressure relief phase-changing partition plate (11.2) and is used to drive the pressure relief phase-changing partition plate (11.2) to rotate; The pressure relief phase converter comprises the high-pressure concentrated seawater input pipeline and the pressure relief concentrated seawater output pipeline; When the pressure relief phase-changing partition plate (11.2) rotates, the high-pressure concentrated seawater input pipeline and the pressure relief concentrated seawater output pipeline can be connected to the pressure relief connecting port one by one. The portion of the pressure relief phase-changing partition plate (11.2) located between the adjacent pressure relief communication ports can seal the pressure relief concentrated seawater output pipeline and the high-pressure concentrated seawater input pipeline.

2. A gravity and air composite energy storage type pressure energy recovery device according to claim 1, characterized in that: The number of pairs of cylinders is 2n pairs; The plurality of cylinders are distributed in a circumference; The number of the high-pressure seawater output pipeline, the high-pressure concentrated seawater input pipeline, the low-pressure seawater input pipeline and the pressure-relieved concentrated seawater output pipeline is 2n; Wherein, n≥1 and is an integer.

3. The gravity and air composite energy storage pressure energy recovery device according to claim 2, characterized in that: The n is 1; There are four cylinders, which are distributed circumferentially at intervals of 90°; The number of the high-pressure seawater output pipeline, the high-pressure concentrated seawater input pipeline, the low-pressure seawater input pipeline and the pressure-relieved concentrated seawater output pipeline are all two.

4. The gravity and air composite energy storage pressure energy recovery device according to claim 1, characterized in that: There are multiple high-pressure seawater output pipelines and multiple low-pressure seawater input pipelines; The booster phase converter also includes a high-pressure seawater output main pipeline (13) and a low-pressure seawater input main pipeline (14); A plurality of the high-pressure seawater output pipelines are connected to the high-pressure seawater output main pipeline (13); A plurality of the low-pressure seawater input pipelines are connected to the low-pressure seawater input main pipeline (14).

5. The gravity and air composite energy storage pressure energy recovery device according to claim 1, characterized in that: There are multiple high-pressure concentrated seawater input pipelines and multiple pressure-relieved concentrated seawater output pipelines; The pressure relief phase converter further comprises a high-pressure concentrated seawater input main pipeline (15) and a pressure relief concentrated seawater output main pipeline (16); A plurality of the high-pressure concentrated seawater input pipelines are connected to the high-pressure concentrated seawater input main pipeline (15); The plurality of decompression concentrated seawater output pipelines are connected to the decompression concentrated seawater output main pipeline (16).

6. The gravity and air composite energy storage pressure energy recovery device according to claim 1, characterized in that: The pressurization communication port and the pressure relief communication port are both arc-shaped communication ports.

7. The gravity and air composite energy storage pressure energy recovery device according to claim 1, characterized in that: A pressure boosting partition (4.1) and a pressure relief partition (4.2) are provided in the cylinder body; The pressurizing baffle (4.1) and the pressure relief baffle (4.2) divide the space in the cylinder into three chambers; The chamber located above the pressurization partition (4.1) forms the pressurization chamber (2); The chamber located between the pressurization partition (4.1) and the pressure relief partition (4.2) forms the gravity energy storage chamber (7); The chamber located below the pressure relief baffle (4.2) forms the pressure relief chamber (9); The connecting rod (6) passes through the pressure-increasing partition (4.1) and the pressure-relieving partition (4.2).

8. The gravity and air composite energy storage pressure energy recovery device according to claim 7, characterized in that: The top of the pressurizing baffle (4.1) and the bottom of the pressure relief baffle (4.2) are both provided with grooves for storing air energy.

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