Capacitive deionization seawater desalination device of ultrasonic enhanced flow electrode charging method

Abstract

The application discloses a capacitive deionization seawater desalination device of an ultrasonic reinforced flow electrode charging method, after ions are adsorbed by charging the positive / negative flow electrode, the electric potential difference of the system is improved by using the electric charge loaded on the surface of the flow electrode, thereby the adsorption capacity of the opposite charge ions is strengthened; meanwhile, the ultrasonic field is coupled on the side of the current collector of the flow electrode capacitive deionization device, the collision and contact frequency between active particles and the ion migration rate are improved by using the acoustic streaming and acoustic cavitation effect generated by the ultrasonic field, thereby the adsorption efficiency and the charge loading capacity of the flow electrode are improved. Compared with the prior art, the application has the beneficial effects as follows: 1, the electric potential difference between the positive electrode and the negative electrode is increased by using the electric charge loaded on the surface of the flow electrode, the electric field driving force and the attraction force of the opposite charge ions are enhanced, thereby the ion adsorption efficiency is improved; 2, the collision and contact frequency between active particles and the ion migration rate in the flow electrode are improved by coupling the ultrasonic field with the flow electrode capacitive deionization device, thereby the charge loading capacity of the flow electrode is improved. 3, the average desalination rate of the capacitive deionization seawater desalination device of the ultrasonic reinforced flow electrode charging method is improved by more than 223.78% compared with the traditional flow electrode capacitive deionization technology, and the charge efficiency is improved from below 70% to above 90%.

Description

Technical Field

[0001] This invention relates to a capacitive deionization seawater desalination device using an ultrasonically enhanced flowing electrode charging method, which belongs to the category of novel seawater desalination devices. Background Technology

[0002] Flow electrode capacitive deionization (FCDI) is a capacitive deionization technology that couples positive and negative flow electrodes to cation and anion exchange membranes. Its adsorption process is similar to how a capacitor stores charge; after ion adsorption, the positive and negative flow electrodes store a large amount of charge. If this charge is not directly regenerated and released, it can lead to energy waste and limit the desalination performance of FCDI. To release this charge, researchers often use a bidirectional power supply (usually a DC-DC converter) to discharge the electrodes, effectively recovering the stored energy. However, this energy recovery method involves releasing the adsorbed ions from the active material in the flow electrode and then recycling the active material. After multiple cycles, its adsorption performance decreases significantly, and it cannot continue to adsorb ions during energy recovery, thus greatly increasing the time cost of FCDI. Furthermore, the active material in the flow electrode often suffers from poor dispersibility and low mass transfer efficiency, leading to reduced charge transfer efficiency and consequently, reduced ion adsorption efficiency of the flow electrode. Therefore, how to enable the flow electrode in the flow electrode capacitive deionization technology to perform efficient charging adsorption and utilize the charge stored during the adsorption process to improve desalination performance is a huge challenge. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides a capacitive deionization seawater desalination device using an ultrasonically enhanced flowing electrode charging method, which can improve the charge transfer efficiency and load of the flowing electrode, and at the same time, utilize the load of the electrode to significantly improve the ion adsorption performance of the flowing electrode capacitive deionization device.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a capacitive deionization seawater desalination device using an ultrasonic-enhanced flowing electrode charging method, comprising an ultrasonic transducer, a flowing electrode capacitive deionization device, and a flowing electrode loaded with positive / negative charges.

[0005] The described ultrasonic-enhanced flowing electrode charging method in a capacitive deionization seawater desalination device involves directly applying ultrasonic waves to the flowing electrode in the current collector. The resulting intense acoustic flow and cavitation effects induce fluid turbulence, causing the active particles in the flowing electrode to move more violently. This increases the contact frequency and ion migration rate between the active particles, thereby enhancing the charge loading of the flowing electrode. The charge loaded in the flowing electrode is then used to increase the potential difference between the positive and negative electrodes of the system, thereby increasing the system's electric field driving force and its attraction to oppositely charged ions, ultimately improving its ion adsorption performance.

[0006] The specific working steps of the capacitive deionization seawater desalination device using the ultrasonic-enhanced flowing electrode charging method described above are as follows:

[0007] Step 1: After the flow electrode capacitor deionization device is set up, the ultrasonic transducer is coupled to the graphite current collector. Then, the ultrasonic transducer is started and stopped by the ultrasonic generator, thereby controlling the propagation of ultrasound in the system.

[0008] Step 2: When the flow electrode capacitive deionization device starts running, the ultrasonic transducer is activated according to the duty cycle set by the ultrasonic generator to transmit ultrasound to the flow channel of the current collector. Local eddies are formed through acoustic flow and acoustic cavitation effects, which change the laminar flow state of the flow field, increase the collision contact frequency and ion migration rate between active particles, thereby improving the adsorption efficiency and charge loading of the flow electrode.

[0009] Step 3: Allow the flowing electrode to be charged and adsorbed for a certain period of time, so that the adsorbed ions can load the surface of the electrode with different charges.

[0010] Step four: Change the flow direction of the dual-channel peristaltic pump's working pipe and the three-way valve, so that the inlet and outlet pipes of the positive electrode flow electrode are connected to the negative electrode of the device, and the inlet and outlet pipes of the negative electrode flow electrode are connected to the positive electrode of the device. By exchanging the positive and negative electrode flow electrodes, the potential difference between the positive and negative electrodes increases through the charge loaded on their surfaces after adsorbing ions, thereby increasing the attraction for ions with opposite charges and thus improving the ion adsorption efficiency.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. An ultrasonic transducer is directly coupled to the current collector. The acoustic flow and acoustic cavitation effect generated by ultrasound make the active particles in the flow electrode move more violently, increasing the contact frequency and ion migration rate between the active particles, thereby increasing the charge load of the flow electrode by more than 130%.

[0013] 2. By using flow electrodes loaded with different electrical charges, on the one hand, the attraction between opposite charges is utilized to improve the adsorption performance of the flow electrodes for ions with opposite charges; on the other hand, the different electrical charges loaded in the flow electrodes increase the potential difference and electric field driving force between the positive and negative electrodes of the system, thereby enhancing the ion adsorption effect.

[0014] 3. The capacitive deionization device using the ultrasonic-enhanced flowing electrode charging method efficiently utilizes the energy stored in the flowing electrode, greatly improving the ion adsorption performance of the flowing electrode capacitive deionization technology. The ion adsorption performance is improved by more than 220% compared with the traditional flowing electrode capacitive deionization technology. Attached Figure Description

[0015] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention;

[0017] Figure 2 This is a diagram showing the coupling method between the ultrasonic transducer and the current collector in the device of the present invention;

[0018] Figure 3 These are the average desalination rate and initial adsorption rate of the device and the flow electrode capacitor deionization device of the present invention.

[0019] Figure 4 These are the average desalination energy consumption and charge efficiency of the device and the flowing electrode capacitor deionization device of the present invention.

[0020] Figure 5 The present invention's device and the flowing electrode capacitor deionization device exhibit average desalination rate, charge efficiency, and average desalination energy consumption for different charging solutions.

[0021] Figure 6 The present invention and the flowing electrode capacitor deionization device are the average desalination rate, charge efficiency and average desalination energy consumption of real seawater.

[0022] Figure 1 In the middle: 1-Flowing electrode capacitor deionization device, 2-Ultrasonic generator, 3-Ultrasonic transducer, 4-Dual-channel peristaltic pump, 5-Flowing electrode storage tank. Detailed Implementation

[0023] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0024] Example 1

[0025] This embodiment provides a capacitor deionization device and its usage method for an ultrasonically enhanced flowing electrode charging method, specifically including the following steps:

[0026] Step 1: Disperse 2.64g of activated carbon into a 50mL container with a concentration of 1.0g·L⁻¹. -1 In a NaCl solution, the mixture was stirred evenly using a magnetic stirrer to form a 5% (w / w) activated carbon electrode slurry. The slurry was then subjected to a short-circuit closed-loop mode at 1.6V to react with 5.0 g / L of activated carbon. -1 The salt solution was used for desalination. The brine flow rate was 20 mL / min. -1 The flow rate of the cathode and anode electrolytes is 40 mL / min. -1 .

[0027] Step Two: As Figure 1 As shown, the flowing electrode capacitor deionization device is assembled, wherein the ultrasonic transducer is bonded to the current collector, and the bonding method is as follows. Figure 2 As shown. While the flow electrode capacitive deionization device is running, the ultrasonic generator is started simultaneously, so that the ultrasonic waves act on the flow electrode in the current collector. Through the acoustic flow and acoustic cavitation effects, local eddies are formed, which change the laminar flow state of the flow field, increase the collision contact frequency and ion migration rate between active particles, thereby improving the adsorption efficiency and charge loading of the flow electrode.

[0028] Step 3: Allow the flowing electrode to be charged and adsorbed for a certain period of time, so that the adsorbed ions can load the surface of the electrode with different charges.

[0029] Step 4: Change the flow direction of the dual-channel peristaltic pump's working pipe and the three-way valve, so that the inlet and outlet pipes of the positive electrode flow electrode are connected to the negative electrode of the device, and the inlet and outlet pipes of the negative electrode flow electrode are connected to the positive electrode of the device. By exchanging the positive and negative electrode flow electrodes, the surface charge after adsorbing ions increases the potential difference between the positive and negative electrodes, thereby increasing the attraction for ions with opposite charges and thus improving the ion adsorption efficiency.

[0030] Step 5: During the operation of the device, the ion concentration of the NaCl solution is detected in real time using a magnetic conductivity meter, and the current flowing through the device is monitored in real time using a digital multimeter. The final data is then processed.

[0031] Example 2

[0032] The other experimental parameters and procedures in this embodiment are the same as in Example 1, except that the salt solution used during charging adsorption is 5.0 g·L⁻¹. -1 A KCl aqueous solution, after exchanging the positive and negative flow electrodes, was applied to 5.0 g·L⁻¹ -1 Desalination is performed using real seawater with varying salinity. Compared to traditional flow electrode capacitive deionization devices, the ion adsorption performance is improved by 70%, resulting in a significant increase in adsorption capacity.

[0033] Example 3

[0034] The other experimental parameters and procedures in this embodiment are the same as in Example 1, except that the salt solution used during charging adsorption is 5.0 g·L⁻¹. -1 A CaCl2 aqueous solution, after exchanging the positive and negative flow electrodes, was applied to 5.0 g·L⁻¹. -1 Desalination was performed using real seawater with varying salinity. Compared to traditional flow electrode capacitive deionization devices, the ion adsorption performance was improved by 32.5%, resulting in a significant increase in adsorption capacity.

[0035] Example 4

[0036] The other experimental parameters and procedures in this embodiment are the same as in Example 1, except that the salt solution used during charging adsorption is 5.0 g·L⁻¹. -1 An aqueous solution of MgCl2, after exchanging the positive and negative flow electrodes, was applied to 5.0 g·L⁻¹. -1 Desalination was performed using real seawater with varying salinity. Compared to traditional flow electrode capacitive deionization devices, the ion adsorption performance was improved by 45.6%, resulting in a significant increase in adsorption capacity.

[0037] Example 5

[0038] The other experimental parameters and procedures in this embodiment are the same as in Example 1. The difference is that the brine used for desalination is real seawater of the original concentration. After charging and adsorption for a period of time, the positive and negative flow electrodes are exchanged. By increasing the potential difference of the system through the various ions loaded on them, the ion adsorption efficiency is improved. Compared with the traditional flow electrode capacitive deionization device, the ion adsorption performance is improved by 64.9%, and the adsorption performance is significantly improved.

[0039] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A capacitive deionization seawater desalination device using an ultrasonically enhanced flowing electrode charging method, characterized in that, It includes an ultrasonic transducer, a flowing electrode capacitor deionization device, and a flowing electrode loaded with positive / negative charges; This flow electrode capacitive deionization device utilizes flowing electrodes to adsorb ions. The positive and negative flowing electrodes are respectively loaded with a certain amount of negative and positive charge, thereby increasing the potential difference between the positive and negative electrodes and enhancing the attraction for oppositely charged ions, thus improving ion adsorption efficiency. Simultaneously, an ultrasonic field is coupled to the flow electrode capacitive deionization device. The intense acoustic flow and acoustic cavitation effects generated by the ultrasound induce fluid turbulence, causing the active particles in the flowing electrodes to move more violently. This increases the contact frequency and ion migration rate between active particles, thereby improving the adsorption efficiency and charge loading of the flowing electrodes. This device can adsorb various salt solutions and real seawater by charging them with ions of different charges, further increasing the potential difference between the positive and negative electrodes and thus strengthening the electric field force for adsorbing oppositely charged ions. The specific working steps are as follows: Step 1: After the flow electrode capacitor deionization device is built, the ultrasonic transducer is coupled to the graphite current collector. Then, the ultrasonic transducer is started and stopped by the ultrasonic generator, thereby controlling the propagation of ultrasound in the system. Step 2: When the flow electrode capacitive deionization device starts running, the ultrasonic transducer is activated according to the duty cycle set by the ultrasonic generator to transmit ultrasound to the flow channel of the current collector. Local eddies are formed through acoustic flow and acoustic cavitation effects, which change the laminar flow state of the flow field, increase the collision contact frequency and ion migration rate between active particles, thereby improving the adsorption efficiency and charge loading of the flow electrode. Step 3: Allow the flow electrode to be charged and adsorbed for a certain period of time, so that the adsorbed ions can load the surface of the electrode with different charges. Step four: Change the flow direction of the dual-channel peristaltic pump's working pipe and the three-way valve, so that the inlet and outlet pipes of the positive electrode flow electrode are connected to the negative electrode of the device, and the inlet and outlet pipes of the negative electrode flow electrode are connected to the positive electrode of the device. By exchanging the positive and negative electrode flow electrodes, the potential difference between the positive and negative electrodes increases through the charge loaded on their surfaces after adsorbing ions, thereby increasing the attraction for ions with opposite charges and thus improving the ion adsorption efficiency.

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