Droplet-shaped flow channel current collector

Abstract

The utility model relates to the field of water desalination treatment, in particular to a liquid drop-shaped flow channel current collector, which comprises a collector plate body, a snakelike flow channel is arranged on the collector plate body, and the snakelike flow channel is divided into a plurality of linear sections and transition sections. According to the utility model, the linear section of the snakelike flow channel adopts a mode of multiple droplet-shaped flow channel sections, so that the problems of precipitation of particles in a flowing electrode and blockage of the flow channel can be effectively improved; due to the streamline design of the droplet-shaped flow channel sections, the velocity gradient of fluid in the flowing process can be reduced, the flow velocity of the flowing electrode in the contraction area flow channel is increased, and the generation of a low-speed area and a particle gathering area in the flow channel is reduced, so that the whole current collector can obtain better desalting performance under the same effective area; the transition section, namely a corner section equivalent to a traditional current collector, adopts a linear design, so that a boundary layer separation phenomenon can be more effectively avoided, vortexes are prevented from being formed in a flow channel, and the energy loss is reduced.

Description

Technical Field

[0001] This utility model relates to the field of water desalination treatment, specifically a droplet-shaped flow channel current collector. Background Technology

[0002] With economic development and population growth, the demand for freshwater resources is constantly increasing. Capacitive deionization (CDI) is a water treatment technology based on adsorption and desorption on a fixed electrode surface. Compared with technologies such as electrodialysis, CDI has the advantages of energy saving and ease of operation, and is widely used in brackish water desalination. However, traditional CDI has limitations such as the common ion effect and the inability to simultaneously perform adsorption and desorption, resulting in limited ion storage space, and is not suitable for desalination of high-concentration brine. An FCDI device (whose structure is as follows)... Figure 1 As shown, the electrodes are changed to a flowing form, and the desorption process occurs outside the device. Because the electrodes desorb outside the device and then flow back into the anode and cathode chambers, the electrodes are continuously renewed, greatly increasing the amount of salt that can be adsorbed. This enables continuous high-speed desalination, allowing charged particles to be continuously adsorbed, saving a lot of time spent on the desorption process, and greatly improving the efficiency of the FCDI system.

[0003] As a key component of the FCDI system, the flow electrode is typically prepared by mixing active materials, conductive materials, and electrolytes in appropriate proportions. Its flow state within the flow channels significantly affects the system's adsorption performance. During adsorption, the flow electrode primarily relies on the flow channels created on the current collector (also known as the collector plate) for airflow. Both the flow state of the flow electrode and the shape of the flow channels on the current collector will have a certain degree of influence on the FCDI system.

[0004] In traditional FCDI devices, the flowing electrode typically flows within a serpentine channel on the current collector. The main body of this serpentine channel is generally divided into multiple alternating long straight sections and corner sections. The long straight sections occupy the majority of the serpentine channel's area, and their inner wall profiles are typically linear, while the inner wall profiles of the corner sections are typically semi-circular.

[0005] During the flow process in the long, straight section of the serpentine channel with a straight inner wall profile, a significant velocity gradient is generated. Consequently, numerous low-velocity zones are created near the channel wall. This design causes particle deposition in these low-velocity zones during adsorption, affecting the adsorption of brine ions by the active material and reducing the desalination rate of the FCDI system.

[0006] To improve the above problems, it is necessary to optimize the flow channel structure on the current collector, reduce the low-speed zone and particle aggregation zone in the flow channel, increase the maximum utilization rate of the effective area in the flow channel, and ultimately improve the desalination rate of the FCDI system. Utility Model Content

[0007] To address the need for optimization of current current collectors, the purpose of this invention is to provide a droplet-shaped flow channel current collector.

[0008] The objective of this utility model is achieved through the following technical solution:

[0009] A droplet-shaped flow channel current collector includes a flow collector plate body. The flow collector plate body has a brine passage hole, a flow electrode inlet, a flow electrode outlet, and a serpentine flow channel. The flow electrode inlet and outlet are located on the same side of the flow collector plate body, and the serpentine flow channel is located on the other side of the flow collector plate body. One end of the serpentine flow channel is connected to the flow electrode inlet, and the other end is connected to the flow electrode outlet. The brine passage hole allows brine to pass through the flow collector plate body. The serpentine flow channel is divided into multiple straight segments and transition segments, with each straight segment... The straight segments are arranged in parallel. The first end of the first straight segment is connected to the inlet of the flow electrode, and the last end of the last straight segment is connected to the outlet of the flow electrode. The first end of each subsequent straight segment is connected to the end of the adjacent preceding straight segment through a corresponding transition segment. Each straight segment is divided into several droplet-shaped flow channel sections that are connected sequentially along the length of the straight segment. The two inner sidewalls of each droplet-shaped flow channel section are symmetrical and streamlined, and the overall outline of the two inner sidewalls of each droplet-shaped flow channel section is droplet-shaped.

[0010] The beginning and end of each droplet-shaped flow channel section are the narrowest points of that droplet-shaped flow channel section.

[0011] The width of the narrowest part of each droplet-shaped flow channel section is 2 mm.

[0012] The widest point of each droplet-shaped flow channel section is located on one side near the beginning of the straight segment corresponding to that droplet-shaped flow channel section.

[0013] The width of the widest part of each droplet-shaped flow channel section is 4 mm.

[0014] Each of the aforementioned droplet-shaped flow channel sections is 13 mm in length.

[0015] The depth of the entire serpentine flow channel is 2mm.

[0016] The two inner sidewalls in the middle of each transition segment are straight and parallel to each other, and the width of the middle of each transition segment is 2mm.

[0017] The main body of the manifold is made of graphite plate.

[0018] The outer side of the collector plate body extends outward and is provided with a wire connecting rod.

[0019] The advantages and positive effects of this utility model are as follows:

[0020] 1. This utility model effectively improves the problems of particle sedimentation and flow channel blockage in the flow electrode by using multiple droplet-shaped flow channel sections in the straight section of the serpentine flow channel; the streamlined design of the droplet-shaped flow channel section can reduce the velocity gradient of the fluid during the flow process, increase the flow velocity of the flow electrode in the contraction region of the flow channel, reduce the generation of low-velocity zone and particle aggregation zone in the flow channel, and enable the current collector to achieve better desalination performance under the same effective area.

[0021] 2. By adopting a straight-line design for the transition section, which is equivalent to the corner section of a traditional current collector, this utility model can more effectively avoid the occurrence of boundary layer separation, prevent the formation of vortices inside the flow channel, and thus reduce energy loss. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the flow capacitor deionization device to which this utility model applies;

[0023] Figure 2 This is a schematic diagram of the structure of this utility model.

[0024] In the figure: 1 is the main body of the manifold, 101 is the brine passage hole, 102 is the flow electrode inlet, 103 is the flow electrode outlet, 104 is the straight section, 1041 is the droplet-shaped flow channel section, 105 is the transition section, and 106 is the wire connecting rod.

[0025] 001 is the outer end plate, 002 is the ion exchange membrane, and 003 is the brine passage module. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-2 The present invention will be described in further detail.

[0027] The droplet-shaped current collector proposed in this invention is applicable to the flow capacitor deionization device, such as... Figure 1 As shown, it generally includes an outer end plate 001, an ion exchange membrane 002 (divided into anion exchange membrane and cation exchange membrane), a current collector, and a brine passage assembly 004 (generally composed of several layers of nylon mesh laid in the inner frame of the silicone gasket). Figure 1The black arrows indicate the approximate direction of the flow electrode, and the white arrows indicate the approximate direction of the brine. Except for the droplet-shaped current collector proposed in this invention, the other structures of the flow capacitor deionization device are basically the same as those in the prior art; therefore, the working principle of the flow capacitor deionization device will not be described in detail.

[0028] The droplet-shaped flow channel current collector proposed in this utility model, such as Figure 2 As shown, the system includes a manifold body 1, which has a brine passage hole 101, a flow electrode inlet 102, a flow electrode outlet 103, and a serpentine flow channel. The brine passage hole 101 allows brine to pass through the manifold body 1, enabling the brine to reach the brine passage zone assembly 004 or allowing treated water to exit from the brine passage zone assembly 004. The flow electrode inlet 102 and the flow electrode outlet 103 are located on the same side of the manifold body 1, while the serpentine flow channel is located on the other side of the manifold body 1. One end of the serpentine flow channel is connected to the flow electrode inlet 102, and the other end is connected to the flow electrode outlet 103. In this embodiment, the flow electrode inlet 102 is located above the flow electrode outlet 103.

[0029] like Figure 2 As shown, in this embodiment, the serpentine flow channel is divided into nine straight segments 104 and eight transition segments 105. The straight segments 104 are arranged parallel to each other. The first end of the first straight segment 104 is connected to the flow electrode input port 102, and the last end of the last straight segment 104 is connected to the flow electrode output port 103. The first end of each subsequent straight segment 104, except for the first straight segment 104, is connected to the end of the adjacent preceding straight segment 104 through a corresponding transition segment 105. Each straight segment 104 is divided into three droplet-shaped flow channel sections 1041 that are connected sequentially along the length of the straight segment 104. The two inner sidewall profiles of each droplet-shaped flow channel section 1041 are symmetrical and streamlined, and the overall profile of the two inner sidewalls of each droplet-shaped flow channel section 1041 is droplet-shaped.

[0030] By using multiple droplet-shaped flow channel sections 1041 for the straight section 104 of the serpentine flow channel, the problems of particle sedimentation and flow channel blockage in the flow electrode can be effectively improved. The streamlined design of the droplet-shaped flow channel section 1041 can reduce the velocity gradient of the fluid during the flow process, increase the flow velocity of the flow electrode in the contraction region of the flow channel, and reduce the generation of low-velocity areas and particle aggregation areas in the flow channel.

[0031] Specifically, in this embodiment, the current collector body 1 is made of graphite plate, and a wire connecting rod 106 extends outward from the outer side of the current collector body 1, which has relatively good conductivity and is lightweight. The wire connecting rod 106 facilitates the connection of external wires to connect positive and negative DC voltages respectively.

[0032] Specifically, the width of each droplet-shaped flow channel section 1041 should not be too large. This is mainly because the fluid itself has viscosity and mass is conserved during incompressible flow. If the width of the droplet-shaped flow channel section 1041 is too large, the flow velocity will decrease when the mass flow rate remains constant (for incompressible fluid). This will lead to changes in the pressure distribution inside the droplet-shaped flow channel section 1041, thus affecting its stability. Moreover, an excessive width will increase the impact of factors such as pressure difference in the lateral direction on the droplet-shaped flow channel section 1041, because mass conservation requires the flow velocity and pressure at different locations to be coordinated. An excessive width will disrupt this coordination, making it difficult for the droplet-shaped flow channel section 1041 to maintain its original characteristics. In this embodiment, the length of each droplet-shaped flow channel section 1041 is 13 mm, and the depth is 2 mm. The beginning and end of each droplet-shaped flow channel section 1041 are its narrowest points, with a width of 2 mm. The widest point of each droplet-shaped flow channel section 1041 is located on one side near the beginning of the straight segment 104 corresponding to the droplet-shaped flow channel section 1041, and the width of the widest point of each droplet-shaped flow channel section 1041 is 4 mm. In this embodiment, the two inner sidewall profiles of the middle part of each transition section 105 are straight and parallel to each other, and the width of the middle part of each transition section 105 is 2 mm. Figure 1 The effective area of ​​the serpentine flow channel in this embodiment is 13.5 cm². 2 The serpentine flow channel formed by the droplet-shaped flow channel section 1041 with the above-mentioned values ​​has a relatively good performance. Among them, the transition section 105, which is equivalent to the corner section of the traditional current collector, adopts a straight design, which can more effectively avoid the occurrence of boundary layer separation, prevent the formation of vortices inside the flow channel, and thus reduce energy loss.

Claims

1. A droplet-shaped flow channel current collector, comprising a current collector plate body (1), wherein the current collector plate body (1) is provided with a brine passage hole (101), a flow electrode inlet (102), a flow electrode outlet (103), and a serpentine flow channel, wherein the flow electrode inlet (102) and the flow electrode outlet (103) are respectively located on the same side of the current collector plate body (1), and the serpentine flow channel is located on the other side of the current collector plate body (1), one end of the serpentine flow channel is connected to the flow electrode inlet (102), and the other end of the serpentine flow channel is connected to the flow electrode outlet (103), wherein the brine passage hole (101) is used to allow brine to pass through the current collector plate body (1), characterized in that: The serpentine flow channel is divided into multiple straight segments (104) and transition segments (105). The straight segments (104) are arranged parallel to each other. The first end of the first straight segment (104) is connected to the flow electrode input port (102), and the last end of the straight segment (104) is connected to the flow electrode output port (103). The first end of each of the other straight segments (104) is connected to the end of the adjacent previous straight segment (104) through a corresponding transition segment (105). Each straight segment (104) is divided into several droplet-shaped flow channel sections (1041) that are connected sequentially along the length direction of the straight segment (104). The two inner sidewall contours of each droplet-shaped flow channel section (1041) are symmetrical and streamlined, and the two inner sidewall contours of each droplet-shaped flow channel section (1041) are generally droplet-shaped.

2. The droplet-shaped flow channel current collector according to claim 1, characterized in that: The beginning and end of each droplet-shaped flow channel section (1041) are the narrowest points of that droplet-shaped flow channel section (1041).

3. The droplet-shaped flow channel current collector according to claim 1, characterized in that: The width of the narrowest part of each of the aforementioned droplet-shaped flow channel sections (1041) is 2 mm.

4. A droplet-shaped flow channel current collector according to claim 1, characterized in that: The widest part of each of the droplet-shaped flow channel sections (1041) is located on one side near the beginning of the straight segment (104) corresponding to that droplet-shaped flow channel section (1041).

5. A droplet-shaped flow channel current collector according to claim 1, characterized in that: The width of the widest part of each of the aforementioned droplet-shaped flow channel sections (1041) is 4 mm.

6. A droplet-shaped flow channel current collector according to claim 1, characterized in that: Each of the aforementioned droplet-shaped flow channel sections (1041) has a length of 13 mm.

7. A droplet-shaped flow channel current collector according to claim 1, characterized in that: The depth of the entire serpentine flow channel is 2mm.

8. A droplet-shaped flow channel current collector according to claim 1, characterized in that: The two inner sidewalls of the middle section of each transition segment (105) are straight and parallel to each other, and the width of the middle section of each transition segment (105) is 2 mm.

9. A droplet-shaped flow channel current collector according to claim 1, characterized in that: The main body of the manifold (1) is made of graphite plate.

10. A droplet-shaped flow channel current collector according to claim 1, characterized in that: The outer side of the collector plate body (1) extends outward and is provided with a wire connecting rod (106).

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