CN109824127B - System for performing electro-adsorption desalination by utilizing photovoltaic energy and using method thereof - Google Patents
System for performing electro-adsorption desalination by utilizing photovoltaic energy and using method thereof Download PDFInfo
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- CN109824127B CN109824127B CN201910132542.7A CN201910132542A CN109824127B CN 109824127 B CN109824127 B CN 109824127B CN 201910132542 A CN201910132542 A CN 201910132542A CN 109824127 B CN109824127 B CN 109824127B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/138—Water desalination using renewable energy
- Y02A20/142—Solar thermal; Photovoltaics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention relates to a system for performing electro-adsorption desalination by utilizing photovoltaic energy and a using method thereof, belonging to the technical field of power conversion. The system comprises a desalination tank set, an MPPT module, a bidirectional DC/DC converter and a control module, wherein the desalination tank set is composed of a plurality of desalination tanks, and each desalination tank comprises a plurality of electrodes which are mutually connected in parallel; the desalting tank is provided with a water inlet for introducing seawater and a water outlet for introducing fresh water/concentrated water, and the water outlet is provided with a conductivity meter; the MPPT module connected with the photovoltaic panel is respectively connected to the electrode and the bidirectional DC/DC converter, and the electrode is connected with the storage battery through the bidirectional DC/DC converter; the control module is respectively connected with a conductivity signal output end of the conductivity meter, an output end of the MPPT module, an output end of the bidirectional DC/DC converter, and valves of the water outlet and the water inlet. The invention solves the problem of high energy consumption of the prior electro-adsorption desalination method and solves the problems of regeneration of desalination tank electrodes and recovery of desalination energy.
Description
Technical Field
The invention relates to a system for performing electro-adsorption desalination by utilizing photovoltaic energy and a using method thereof, belonging to the technical field of power conversion.
Background
The sea water desalination is important for solving the water resource shortage of coastal cities in China, but the current sea water desalination technology has the defects of high reverse osmosis membrane cost, short service life, limited anti-pollution capacity and the like.
Disclosure of Invention
Aiming at the defect of high energy consumption of sea water desalination by a capacitance method at present, the invention provides a system for performing electro-adsorption desalination by utilizing photovoltaic energy and a using method thereof.
The system for performing electro-adsorption desalination by utilizing photovoltaic energy comprises a desalination tank set, an MPPT module, a bidirectional DC/DC converter and a control module, wherein the desalination tank set consists of a plurality of desalination tanks, and each desalination tank comprises a plurality of electrodes which are connected in parallel; the desalting tank is provided with a water inlet for introducing seawater and a water outlet for introducing fresh water/concentrated water, and the water outlet is provided with a conductivity meter; the MPPT module connected with the photovoltaic panel is respectively connected to the electrode and the bidirectional DC/DC converter, and the electrode is connected with the storage battery through the bidirectional DC/DC converter; the control module is respectively connected with a conductivity signal output end of the conductivity meter, an output end of the MPPT module, an output end of the bidirectional DC/DC converter, and valves of the water outlet and the water inlet.
Preferably, the desalination tank group is formed by connecting a plurality of desalination tanks in series, a plurality of electrodes which are vertically arranged side by side are arranged in each desalination tank, a plurality of electrodes are arranged at intervals, and the positive electrodes and the negative electrodes are respectively and independently connected to form the positive electrodes and the negative electrodes.
Preferably, the seawater flowing in from the water inlet sequentially passes through the top of the leftmost electrode in the desalting tank, flows downwards under the resistance of the electrodes, flows into the bottom of the right adjacent electrode through the bottom of the leftmost electrode until reaching the bottom of the rightmost electrode, and is discharged through the water outlet; the seawater advances in the desalting tank in a wave shape.
Preferably, the charged particles of the seawater flowing into the water inlet migrate to the electrode under the action of the external electric field and are adsorbed and desorbed by the electrode, and fresh water is obtained through the water outlet; when the electrode is saturated, the adsorbed charged particles fall off from the electrode, and the concentrated water is discharged through the water outlet.
Preferably, the output end of the photovoltaic panel is connected with the input end of the MPPT module, and is used for providing an input voltage to the MPPT module; the output end of the MPPT module is connected with the electrode and the control module; and the MPPT algorithm is used for obtaining the output voltage signal and the output current signal of the MPPT module and then carrying out MPPT algorithm operation to obtain the control quantity of the MPPT module, so that the photovoltaic panel reaches the maximum output power.
Preferably, the total output power of the output end of the photovoltaic panel is greater than the total power required by electrode desalination, and the output end of the photovoltaic panel is connected with the input end of the storage battery through the MPPT module and the bidirectional DC/DC converter in sequence; the total output power of the output end of the photovoltaic panel is less than the total power required by electrode desalination, and the output end of the storage battery is connected with the electrodes through the bidirectional DC/DC converter and the MPPT module in sequence.
Preferably, the electrode material comprises activated carbon, carbon aerogel, carbon nanotubes.
Preferably, the MPPT module and the bidirectional DC/DC converter are provided with voltage and current detection modules at input and output ends thereof.
The use method of the system for performing electro-adsorption desalination by utilizing photovoltaic energy comprises the following steps:
the method comprises the following steps: the control module collects a conductivity signal of a conductivity meter at the water outlet of the desalination tank group and judges the water flow concentration according to the detected conductivity signal;
the first condition is as follows: if the water flow discharged by the desalting tank group is judged to be seawater, entering the second step;
case two: if the water flow discharged by the desalting tank group is judged to be concentrated water, opening a water outlet valve to discharge the concentrated water, introducing new seawater through a water inlet, and judging in the first step again;
case three: if the water flow discharged by the desalination tank group is judged to be fresh water, the water outlet valve is opened to collect the fresh water, new seawater is introduced through the water inlet, and the judgment of the first step is repeated;
step two: the control module collects electrode voltage signals in the desalting tank group and judges whether to recover the energy of the desalting tank group or not according to the voltage signals;
the first condition is as follows: if the electrodes in the desalination tank group are judged to have no voltage, the total output power of the photovoltaic panel is continuously judged to meet the desalination requirement, and if the total output power meets the desalination requirement, the step III is carried out;
case two: if the voltage of the electrodes in the desalination tank group is judged, starting a bidirectional DC/DC converter, storing the energy of the desalination tank group into a storage battery, and judging in the first step again;
step three: starting an MPPT module to output maximum power desalination, detecting current, voltage and conductivity signals of each loop in real time through a control module, and closing the MPPT module until charged particles on electrodes are saturated; and continuing to repeat the step one until the desalination is finished.
Preferably, in the first step, when the detection signal of the conductivity is within the conductivity range of the seawater and it is detected that the photovoltaic panel has sufficient energy output, the control module outputs a PWM control signal, controls the MPPT module to perform MPPT operation according to the collected voltage and current signals of the photovoltaic panel, and starts to perform desalination; if the energy output by the photovoltaic panel is larger than the energy required by the desalination tank group, the redundant energy is stored in the storage battery through the bidirectional DC/DC converter, if the energy output by the photovoltaic panel is smaller than the energy required by the desalination tank group, the energy originally stored in the storage battery is supplied to the desalination tank group through the bidirectional DC/DC converter for desalination, after desalination is completed, fresh water is discharged out of the desalination tank group for storage and further treatment, new seawater is introduced, the energy is recycled into the storage battery through the bidirectional DC/DC converter, the seawater is changed into concentrated water at the moment, the new seawater is introduced after being discharged, and desalination is repeated.
The invention has the beneficial effects that: according to the system for performing electro-adsorption desalination by using photovoltaic energy and the using method thereof, the problem of high energy consumption of the current electro-adsorption desalination method is solved by using solar energy as main desalination energy; a bidirectional DC/DC circuit is designed, so that the regeneration of the desalting tank electrode and the recovery of desalting energy are solved; the desalination process can be directly put into an actual seawater desalination plant for application according to actual conditions, the whole desalination process almost does not need human participation, and systematic production can be realized; the circuit has the advantages of simple structure, easy realization, low power consumption, energy conservation, environmental protection, no generation of pollutants, and direct discharge of concentrated water after electrode regeneration to the sea.
Drawings
FIG. 1 is an overall schematic diagram of a desalination system of the present invention.
FIG. 2 is a schematic diagram of the construction of a desalination cell stack according to the present invention.
Fig. 3 is a circuit diagram of an MPPT module of the present invention.
Fig. 4 is a diagram of a bidirectional DC/DC converter of the present invention.
Fig. 5 is a driving circuit diagram of the MOS transistor of the present invention.
Fig. 6 is a circuit diagram of a voltage detection module of the present invention.
Fig. 7 is a circuit diagram of a current detection module of the present invention.
Fig. 8 is a block flow diagram of the present invention.
In the figure: 1. a control module; 2. an MPPT module; 3. a photovoltaic panel; 4. a bidirectional DC/DC converter; 5. a storage battery; 6. desalting tanks; 7. an electrode; 8. a conductivity meter; 9. a water inlet; 10. and (7) a water outlet.
Detailed Description
In order to make the object and technical solution of the present invention more apparent, the present invention will be further described in detail with reference to the following examples.
Example 1:
as shown in fig. 1 to 7, the system and the method for performing electro-adsorption desalination by using photovoltaic energy according to the present invention, which are provided by the invention, are directed to the disadvantage of high energy consumption in the current desalination of seawater by a capacitance method, and the present invention recovers the energy stored in the desalination tank 6 during desalination into the storage battery 5 on the basis that the main energy source for seawater desalination is derived from the optical energy, thereby further reducing the overall energy consumption.
As shown in FIG. 1, the system for electro-absorption desalination by photovoltaic energy and the method thereof according to the present invention comprise the following parts: the device comprises a desalting tank group, an MPPT module 2, a bidirectional DC/DC converter 4, a driving and signal conditioning circuit and the like.
A desalting tank group: the single desalting tank 6 can be made into a plurality of electrodes 7 which are connected in parallel, the adsorption area is increased, and the capacitance of the desalting tank 6 is increased, and the single voltage of the single desalting tank 6 cannot exceed 3V (overhigh voltage can cause water electrolysis), so the terminal voltage is increased by connecting a plurality of desalting tanks 6 in series. In the practical application process, the structure shown in fig. 2 can be made, and the specific size can be made according to the practical requirement. Such as the desalination cell cluster model shown in figure 2.
The desalting principle by a capacitance method is as follows: the desalination tank 6 is equivalent to a capacitor, the desalination process is a process of charging the desalination tank 6, and when seawater flows between the plates of a circulation capacitor with large capacitance, the cyclic process of ion adsorption and desorption is carried out on the plates, so that desalination of the seawater is realized. In the charging (adsorption) stage of the capacitor, charged particles in the raw material liquid respectively migrate to the polar plates under the action of an external electric field and are then adsorbed by the polar plates, so that fresh water is obtained. When the polar plate reaches adsorption saturation or approaches to adsorption saturation, the electric energy of the polar plate is recycled into the storage battery through the bidirectional DC/DC converter, so that the adsorbed charged particles fall off from the polar plate and are washed and discharged by seawater, and the regeneration of the polar plate is realized. The capacitor then proceeds to the next charge-discharge cycle.
If the terminal voltage needs to be increased, a plurality of desalting tanks 6 in FIG. 2 can be connected in series, and the materials of the electrode 7 currently used for the research of desalting by the capacitance method include activated carbon, carbon aerogel, carbon nanotubes and the like.
MPPT module 2: maximum Power Point Tracking (MPPT), here, a DC/DC converter controlled by an MPPT algorithm, the converter employs a Boost circuit and is controlled by a conventional MPPT algorithm. The Boost circuit shown in fig. 3 is a main circuit of the MPPT module 2, and is a slightly improved classical Boost circuit, where the original position of V2 is a diode, where a MOS transistor is used for substitution, so as to reduce the previous energy consumption on the diode, and a rectifier diode in the circuit is substituted by the MOS transistor, because the voltage drop on the MOS transistor is relatively low when the MOS transistor is turned on, the efficiency of the power supply can be significantly improved, C1 is a filter capacitor, C2 is an energy storage capacitor, VD is a diode, L is an inductor, V is a switching transistor (MOS), in addition, a current and voltage detection circuit is required, a measurement signal is input to a control chip to perform MPPT operation, and an operation result changes an output voltage for the switching transistor V through a driving circuit (wherein an output voltage limiting link is required to be added in the MPPT algorithm, so as to prevent the output voltage from exceeding a desalination allowable voltage).
Because both sides of the bidirectional DC/DC converter 4 can be used as a power supply or a load, in practical application, the bidirectional voltage-boosting and voltage-reducing DC/DC converter can meet most scenes. Therefore, a Buck and Boost circuit cascade mode is adopted, the MOS tube is used for replacing a diode to achieve bidirectional energy flow and synchronous rectification of the MOS tube, and therefore the bidirectional DC/DC converter 4 is obtained. The bidirectional DC/DC converter 4 is bidirectional, so both sides can be used as voltage input and output, the controller in fig. 4 is the same as the controller in the MPPT module 2, a controller that can meet control requirements such as DSP, STM32, FPGA, PLC, etc. can be selected, Q1, Q2, Q3, Q4 are MOS transistors, wherein control signals of Q1 and Q2 are complementary, control signals of Q3 and Q4 are complementary, and since signals of the controller often cannot directly drive the MOS transistors, and safety considerations for the controller should also give isolation between the controller and the MOS transistors, a half-bridge driving chip is adopted to convert PWM control signals output by the controller into signals that can drive the MOS transistors. In addition, the input and output voltage and current also need to be detected, that is, the voltage and current signals need to be conditioned and then sent to an AD module of the controller for controlling algorithm operation. The specific circuit is shown in fig. 5 to 7.
The driving and signal conditioning circuit: fig. 5 shows an IR2110 half-bridge drive circuit: the Boost circuit in the MPPT module 2 needs an IR2110 half-bridge driving chip, in fig. 5, Hin and Lin are PWM control signals output by the controller, and are amplified into 12V of HO and LO PWM control signals through the driving circuit, HO is connected to V2 of the Boost circuit in the MPPT, LO is connected to V1, and VSS is connected to VSS. In the bidirectional DC/DC converter 4 module, two IR2110 driving chips are needed, Hin and Lin are connected with PWM control signal output of a controller, HO and LO of a first chip are respectively connected with Q1 and Q2 of a bidirectional Buck-Boost circuit, HO and LO of a second chip are respectively connected with Q3 and Q4;
fig. 6 shows a voltage detection circuit, and fig. 7 shows a current detection circuit. The voltage detection of the system adopts a differential amplification circuit to detect and proportionally convert voltage signals into a voltage range (generally 0-3.3V) which can be accepted by an AD module of the controller, and the differential amplification can eliminate common-mode interference in the circuit. The current detection is performed by using a dedicated current detection chip ACS712 to detect and convert a voltage signal that can be accepted by the controller, but the voltage and current detection is not limited to the above two methods. The input and output of the Boost circuit and the input and output of the bidirectional Buck-Boost circuit require voltage and current detection.
Example 2:
the working principle and the operation steps of the invention are as follows: the core of the whole system is a control chip in a control module 1, when a detection signal of the conductivity is in a conductivity range of seawater and sufficient energy output of a photovoltaic panel 3 is detected, the control module 1 outputs a PWM control signal to control an MPPT module 2 to perform MPPT operation according to a collected voltage and current signal of the photovoltaic panel 3 to start desalination, if the energy output by the photovoltaic panel 3 is greater than the energy required by a desalination tank 6, redundant energy is stored in a storage battery 5 through a bidirectional DC/DC converter 4, if the energy output by the photovoltaic panel 3 is less than the energy required by the desalination tank 6, the energy stored in the storage battery 5 is provided to the desalination tank 6 through the bidirectional DC/DC converter 4 to be desalinated, after desalination, fresh water is discharged from the desalination tank 6 to be further processed, new seawater is introduced, and the energy is recycled into the storage battery 5 through the bidirectional DC/DC converter 4, at the moment, the seawater is changed into concentrated water, new seawater is introduced after being discharged, and the desalination is repeated. The specific steps are shown in fig. 8.
The use method of the system for performing electro-adsorption desalination by utilizing photovoltaic energy comprises the following steps:
the method comprises the following steps: the control module 1 collects a conductivity signal of a conductivity meter 8 at a water outlet 10 of the desalination tank group, and judges the water flow concentration according to the detected conductivity signal;
the first condition is as follows: if the water flow discharged by the desalting tank group is judged to be seawater, entering the second step;
case two: if the water flow discharged by the desalting tank group is judged to be concentrated water, a valve of a water outlet 10 is opened to discharge the concentrated water, new seawater is introduced through a water inlet 9, and the judgment of the first step is repeated;
case three: if the water flow discharged by the desalination tank group is judged to be fresh water, a valve of a water outlet 10 is opened to collect the fresh water, new seawater is introduced through a water inlet 9, and the judgment of the first step is repeated;
step two: the control module 1 collects voltage signals of electrodes 7 in the desalination tank group and judges whether to recover the energy of the desalination tank group or not according to the voltage signals;
the first condition is as follows: if the electrodes 7 in the desalination tank group are judged to have no voltage, the total output power of the photovoltaic panel 3 is continuously judged to meet the desalination requirement, and if the total output power meets the desalination requirement, the step III is carried out;
case two: if the electrodes 7 in the desalination tank set are judged to have voltage, the bidirectional DC/DC converter 4 is started, the energy of the desalination tank set is stored in the storage battery 5, and the judgment of the first step is repeated;
step three: starting the MPPT module 2 to output maximum power desalination, detecting current, voltage and conductivity signals of each loop in real time through the control module 1, and closing the MPPT module 2 until charged particles on the electrodes 7 are saturated; and continuing to repeat the step one until the desalination is finished.
In the first step, when the detection signal of the conductivity is within the conductivity range of the seawater and it is detected that the photovoltaic panel 3 has sufficient energy output, the control module 1 outputs a PWM control signal, controls the MPPT module 2 to perform MPPT operation according to the collected voltage and current signals of the photovoltaic panel 3, and starts to perform desalination; if the energy output by the photovoltaic panel 3 is larger than the energy required by the desalination tank group, the redundant energy is stored in the storage battery 5 through the bidirectional DC/DC converter 4, if the energy output by the photovoltaic panel 3 is smaller than the energy required by the desalination tank group, the energy originally stored in the storage battery 5 is supplied to the desalination tank group through the bidirectional DC/DC converter 4 for desalination, after desalination is completed, fresh water is discharged from the desalination tank group for storage and further treatment, new seawater is introduced, the energy is recycled into the storage battery 5 through the bidirectional DC/DC converter 4, the seawater is changed into concentrated water at the moment, the new seawater is introduced after being discharged, and desalination is repeated.
The invention has the beneficial effects that: according to the system for performing electro-adsorption desalination by using photovoltaic energy and the using method thereof, the problem of high energy consumption of the current electro-adsorption desalination method is solved by using solar energy as main desalination energy; a bidirectional DC/DC circuit is designed, so that the regeneration of the electrode 7 of the desalting tank 6 and the recovery of desalting energy are solved; the desalination process can be directly put into an actual seawater desalination plant for application according to actual conditions, the whole desalination process almost does not need human participation, and systematic production can be realized; the circuit related by the invention has the advantages of simple structure, easy realization, low power consumption, energy conservation, environmental protection and no generation of pollutants, and concentrated water generated after the regeneration of the electrode 7 can be directly discharged back to the sea.
The invention can be widely applied to power conversion occasions.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A system for performing electro-adsorption desalination by utilizing photovoltaic energy is characterized by comprising a desalination tank set, an MPPT module (2), a bidirectional DC/DC converter (4) and a control module (1), wherein the desalination tank set is composed of a plurality of desalination tanks (6), and each desalination tank (6) comprises a plurality of electrodes (7) which are mutually connected in parallel; the desalting tank (6) is provided with a water inlet (9) for introducing seawater and a water outlet (10) for leading fresh water/concentrated water out, and the water outlet (10) is provided with a conductivity meter (8); the MPPT module (2) connected with the photovoltaic panel (3) is respectively connected to the electrode (7) and the bidirectional DC/DC converter (4), and the electrode (7) is connected with the storage battery (5) through the bidirectional DC/DC converter (4); the control module (1) is respectively connected with a conductivity signal output end of the conductivity meter (8), an output end of the MPPT module (2), an output end of the bidirectional DC/DC converter (4), and valves of a water outlet (10) and a water inlet (9);
the desalting tank group is formed by connecting a plurality of desalting tanks (6) in series, a plurality of electrodes (7) which are vertically arranged side by side are arranged in each desalting tank (6), the anodes and the cathodes of the plurality of electrodes (7) are arranged at intervals, and the electrodes (7) which are the anodes and the electrodes (7) which are the cathodes are respectively and independently connected to form the anodes and the cathodes;
the seawater flowing in from the water inlet (9) sequentially passes through the tops of the leftmost electrodes (7) in the desalting tanks (6), flows downwards under the resistance of the electrodes (7), flows into the bottoms of the right adjacent electrodes (7) through the bottoms of the leftmost electrodes (7) until reaching the bottoms of the rightmost electrodes (7), and is discharged through the water outlet (10); the seawater moves forward in the desalting tank (6) in a wave shape;
charged particles of seawater flowing into the water inlet (9) migrate to the electrode (7) under the action of an external electric field and are adsorbed and desorbed by the electrode (7), and fresh water is obtained through the water outlet (10); when the electrode (7) is saturated, the adsorbed charged particles fall off from the electrode (7) under the action of a reverse or withdrawn external electric field, and concentrated water is discharged through the water outlet (10);
the output end of the photovoltaic panel (3) is connected with the input end of the MPPT module (2) and is used for providing input voltage for the MPPT module (2); the output end of the MPPT module (2) is connected with the electrode (7) and the control module (1); the control module (1) is used for obtaining an output voltage signal and an output current signal of the MPPT module (2) and then carrying out MPPT algorithm operation to obtain a control quantity of the MPPT module (2), so that the photovoltaic panel (3) achieves the maximum output power;
the total output power of the output end of the photovoltaic panel (3) is greater than the total power required by the electrode (7) for desalination, and the output end of the photovoltaic panel (3) is connected with the input end of the storage battery (5) through the MPPT module (2) and the bidirectional DC/DC converter (4) in sequence; the total output power of the output end of the photovoltaic panel (3) is less than the total power required by the electrode (7) for desalination, and the output end of the storage battery (5) is connected with the electrode (7) through the bidirectional DC/DC converter (4) and the MPPT module (2) in sequence;
the electrode (7) material comprises activated carbon, carbon aerogel and carbon nano tubes;
and the input and output ends of the MPPT module (2) and the bidirectional DC/DC converter (4) are provided with voltage and current detection modules.
2. Use of a system for electro-absorption desalination by photovoltaic energy according to claim 1, characterized in that it comprises the following steps:
the method comprises the following steps: the control module (1) collects a conductivity signal of a conductivity meter (8) at a water outlet (10) of the desalination tank group, and the concentration of water flow is judged according to the detected conductivity signal;
the first condition is as follows: if the water flow discharged by the desalting tank group is judged to be seawater, entering the second step;
case two: if the water flow discharged by the desalting tank group is judged to be concentrated water, a valve of a water outlet (10) is opened to discharge the concentrated water, new seawater is introduced through a water inlet (9), and the judgment of the first step is repeated;
case three: if the water flow discharged by the desalination tank group is judged to be fresh water, a valve of a water outlet (10) is opened to collect the fresh water, new seawater is introduced through a water inlet (9), and the judgment of the first step is repeated;
step two: the control module (1) collects voltage signals of electrodes (7) in the desalination tank set and judges whether to recover the energy of the desalination tank set or not according to the voltage signals;
the first condition is as follows: if the electrodes (7) in the desalination tank group are judged to have no voltage, the total output power of the photovoltaic panel (3) is continuously judged to meet the desalination requirement, and if the total output power meets the desalination requirement, the step three is carried out;
case two: if the electrodes (7) in the desalination tank set are judged to have voltage, starting a bidirectional DC/DC converter (4), storing the energy of the desalination tank set into a storage battery (5), and judging in the first step;
step three: starting the MPPT module (2) to output maximum power for desalination, detecting current, voltage and conductivity signals of each loop in real time through the control module (1), and closing the MPPT module (2) until charged particles on the electrodes (7) are saturated; continuously repeating the step one until the desalination is finished;
in the first step, when the detection signal of the conductivity is in the conductivity range of the seawater and the photovoltaic panel (3) is detected to have sufficient energy output, the control module (1) outputs a PWM control signal, controls the MPPT module (2) to carry out MPPT operation according to the collected voltage and current signals of the photovoltaic panel (3) and starts to carry out desalination; if the energy output by the photovoltaic panel (3) is larger than the energy required by the desalination tank group, the redundant energy is stored in the storage battery (5) through the bidirectional DC/DC converter (4), if the energy output by the photovoltaic panel (3) is smaller than the energy required by the desalination tank group, the energy originally stored in the storage battery (5) is supplied to the desalination tank group for desalination through the bidirectional DC/DC converter (4), after desalination is completed, fresh water is discharged from the desalination tank group for storage and further treatment, new seawater is introduced, the energy is recycled into the storage battery (5) through the bidirectional DC/DC converter (4), and at the moment, the seawater is changed into concentrated water, and the new seawater is introduced after being discharged and is repeatedly desalinated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910132542.7A CN109824127B (en) | 2019-02-22 | 2019-02-22 | System for performing electro-adsorption desalination by utilizing photovoltaic energy and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910132542.7A CN109824127B (en) | 2019-02-22 | 2019-02-22 | System for performing electro-adsorption desalination by utilizing photovoltaic energy and using method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
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| CN111270257A (en) * | 2020-03-30 | 2020-06-12 | 中国华能集团清洁能源技术研究院有限公司 | Offshore wind power hydrogen production system and method based on electro-adsorption desalination technology |
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