CN110745912B - Parallel membrane capacitor deionization system and control method thereof - Google Patents
Parallel membrane capacitor deionization system and control method thereof Download PDFInfo
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- CN110745912B CN110745912B CN201910886910.7A CN201910886910A CN110745912B CN 110745912 B CN110745912 B CN 110745912B CN 201910886910 A CN201910886910 A CN 201910886910A CN 110745912 B CN110745912 B CN 110745912B
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- deionization
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4691—Capacitive deionisation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
Abstract
The invention discloses a parallel membrane capacitance deionization system which comprises a water inlet system, a battery, a membrane capacitance deionization assembly, a direct current-direct current converter and a control module, wherein the battery, the membrane capacitance deionization assembly and the direct current-direct current converter are connected in series through a circuit, a flow meter is arranged on a water inlet pipe of the membrane capacitance deionization assembly, a diaphragm valve is arranged on a water outlet pipe of the membrane capacitance deionization assembly, water inlet pipes of a plurality of membrane capacitance deionization assemblies are connected in parallel in front of the flow meter and connected with a water inlet header pipe, water inlet pipes of the plurality of membrane capacitance deionization assemblies are connected in parallel behind the diaphragm valve and connected with a water outlet header pipe, the water inlet system is connected with the water inlet header pipe, and the membrane capacitance deionization assembly and the direct current-direct current converter are connected with the control module through signals. The invention also provides a control method of the parallel membrane capacitor deionization system, which can enable a plurality of parallel membrane capacitor deionization components to achieve balanced desalination efficiency.
Description
Technical Field
The invention belongs to the field of water treatment, and particularly relates to a parallel membrane capacitor deionization system and a control method thereof.
Background
With the continuous growth of population and environmental pollution, water resource shortage (domestic, industrial and agricultural water) becomes a great challenge. Desalination of sea water or brackish water is an effective means to solve the water resource shortage. At present, the main desalination techniques are ion exchange, reverse osmosis, membrane distillation, and the like. However, these techniques are energy intensive and prone to secondary pollution. As a novel desalination technology, the membrane capacitance deionization technology attracts people's extensive attention due to the characteristics of low energy consumption, environmental friendliness, simple operation and the like. The membrane capacitance deionization is that under the action of an electric field, anions and cations in a solution respectively migrate to an anode and an anion to realize the desalination of the solution. However, the existing membrane capacitor deionization components have different water resistance and resistance among the components due to the manufacturing process, and the desalting efficiency of each membrane capacitor deionization component is different, so that when a plurality of components are operated in parallel, the charging and discharging frequency of each component is difficult to ensure to be the same, thereby influencing the desalting efficiency of the overall equipment.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a parallel membrane capacitor deionization system and a control method thereof, which can achieve balanced desalination efficiency for a plurality of membrane capacitor deionization modules connected in parallel.
In order to achieve the purpose, the invention provides the following technical scheme: a parallel membrane capacitor deionization system comprises a water inlet system, a battery, a membrane capacitor deionization component, a direct current-direct current converter and a control module, and is characterized in that: the battery, the membrane capacitance deionization component and the direct current-direct current converter are connected in series through a circuit, a flow meter is arranged on a water inlet pipe of the membrane capacitance deionization component, a diaphragm valve is arranged on a water outlet pipe of the membrane capacitance deionization component, a plurality of water inlet pipes of the membrane capacitance deionization component are connected in parallel in front of the flow meter and connected with a water inlet main pipe, the water inlet pipes of the membrane capacitance deionization component are connected in parallel behind the diaphragm valve and connected with a water outlet main pipe, the water inlet system is connected with the water inlet main pipe, and the membrane capacitance deionization component and the direct current-direct current converter are connected with a control module through signals.
Further, the control module is a programmable logic controller.
Furthermore, a conductivity recorder is arranged on each of the water inlet main pipe and the water outlet main pipe.
Furthermore, the water outlet main pipe is respectively connected with a water purifying tank and a waste water tank, a water purifying electromagnetic valve is arranged on a pipeline between the water outlet main pipe and the water purifying tank, a waste water electromagnetic valve is arranged on a pipeline between the water outlet main pipe and the waste water tank, and the water purifying electromagnetic valve and the waste water electromagnetic valve are connected with the control module through signals.
The operation principle of the invention is as follows: the method comprises the steps that inflow water enters a membrane capacitance deionization component for desalination from an inflow system through an inflow header pipe, the membrane capacitance deionization component carries out charge-discharge circulation according to the sequence of charging-waiting-discharging-waiting-charging-so as to realize desalination and electrode regeneration, a battery charges the membrane capacitance deionization component through a direct current-direct current converter in a charging stage of the membrane capacitance deionization component, electric energy discharged by the membrane capacitance deionization component is led into the battery through the direct current-direct current converter in a discharging stage of the membrane capacitance deionization component to charge the battery, when the conductivity of the outflow water is smaller than or equal to a set value, a purified water solenoid valve is opened, the wastewater solenoid valve is closed, the outflow water enters a purified water tank, when the conductivity of the outflow water is higher than the set value, the wastewater solenoid valve is opened, the purified water solenoid valve is closed, and the outflow water enters the wastewater tank.
The invention also provides a control method of the parallel membrane capacitor deionization system, which is characterized by comprising the following steps: the method comprises the following steps:
step one, adjusting diaphragm valves after water is introduced into a system, enabling the liquid flow rates of all membrane capacitor deionization assemblies to be the same, and enabling all the membrane capacitor deionization assemblies to enter a discharge state until the voltages of all the membrane capacitor deionization assemblies reach low values;
secondly, when the membrane capacitance deionization assembly is charged, all the membrane capacitance deionization assemblies are charged by the maximum current, after ten seconds of charging, the membrane capacitance deionization assembly with the lowest voltage is a 'main' assembly, and the rest membrane capacitance deionization assemblies are 'auxiliary' assemblies; the electrode current of the 'master' component is unchanged, after each period of time, the 'master' component and the 'slave' component compare voltages with each other, when the voltage of the 'slave' component is higher than that of the 'master' component, the 'slave' component reduces certain charging current, when the voltage of the 'slave' component is lower than that of the 'master' component, the 'slave' component increases certain charging current, the comparison process lasts for the whole charging process, when the voltage of any component reaches the highest value, the charging process of all the components is finished, the control module records the 'master and slave' relationship and the final charging current of all the membrane capacitor deionization components, and the direct current-direct current converter enters the discharging process after stopping charging for a period of time;
step three, when the membrane capacitor deionization components are discharged, the components are discharged at the maximum current, when the voltage of any membrane capacitor deionization component reaches a set value, the direct current-direct current converter stops charging and discharging the components, other membrane capacitor deionization components are waited for, when the voltages of all the membrane capacitor deionization components reach the set value, the discharging process is finished, and after the direct current-direct current converter stops charging and discharging for a period of time, the next charging process is started;
and step four, starting the next charging process, continuing to use all the relation of the main and the auxiliary and the final charging current of each membrane capacitance deionization component, and repeating the comparison process in the step two until the charging voltage of all the membrane capacitance deionization components is similar.
Compared with the prior art, the invention has the following beneficial effects: the parallel membrane capacitor deionization components can achieve balanced desalination efficiency, and the charging and discharging frequencies are not different when multiple groups are connected in parallel due to the difference caused by the component manufacturing process; the electric energy released in the discharging process of the membrane capacitor deionization component is recovered through the direct current-direct current converter, so that the energy consumption for treatment is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1. a water intake system; 2. a battery; 3. a membrane capacitive deionization unit; 4. a DC-DC converter; 5. a control module; 6. a flow meter; 7. a diaphragm valve; 8. a water inlet main pipe; 9. a water outlet main pipe; 10. a conductivity recorder; 11. a water purifying tank; 12. a wastewater tank; 13. a water purification solenoid valve; 14. waste water solenoid valve.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1, a parallel membrane capacitor deionization system includes a water inlet system 1, a battery 2, a membrane capacitor deionization module 3, a dc-dc converter 4, a control module 5, the battery 2, the membrane capacitor deionization module 3, and the dc-dc converter 4 are connected in series by a circuit, a flow meter 6 is disposed on a water inlet pipe of the membrane capacitor deionization module 3, a diaphragm valve 7 is disposed on a water outlet pipe of the membrane capacitor deionization module 3, the water inlet pipes of the membrane capacitor deionization modules 3 are connected in parallel and in front of the flow meter 6 and connected to a water inlet main pipe 8, the water inlet pipes of the membrane capacitor deionization modules 3 are connected in parallel and in rear of the diaphragm valve 7 and connected to a water outlet main pipe 9, the water inlet system 1 is connected to the water inlet main pipe 8, and the membrane capacitor deionization module 3 and the dc-dc converter 4 are connected to the control module 5 by signals.
The control module 5 is a programmable logic controller, the water inlet main pipe 8 and the water outlet main pipe 9 are both provided with a conductivity recorder 10, the water outlet main pipe 8 is respectively connected with a purified water tank 11 and a waste water tank 12, a water purifying electromagnetic valve 13 is arranged on a pipeline between the water outlet main pipe 8 and the purified water tank 11, a waste water electromagnetic valve 14 is arranged on a pipeline between the water outlet main pipe 8 and the waste water tank 12, and the purified water electromagnetic valve 13 and the waste water electromagnetic valve 14 are both in signal connection with the control module 5.
The embodiment of the invention discloses a control method of a parallel membrane capacitor deionization system, which comprises the following steps: the method comprises the following steps:
step one, adjusting a diaphragm valve 7 after water is introduced into the system, enabling the liquid flow rate of each membrane capacitor deionization assembly 3 to be the same, and enabling each membrane capacitor deionization assembly 3 to enter a discharge state until the voltage of all the membrane capacitor deionization assemblies 3 reaches a low value;
secondly, when the membrane capacitance deionization assembly 3 is charged, all the membrane capacitance deionization assemblies 3 are charged by the maximum current, after ten seconds of charging, the membrane capacitance deionization assembly 3 with the lowest voltage is a 'main' assembly, and the rest membrane capacitance deionization assemblies 3 are 'auxiliary' assemblies; the electrode current of the 'main' component is unchanged, after each period of time, the 'main' component and the 'auxiliary' component compare the voltage with each other, when the voltage of the 'auxiliary' component is higher than that of the 'main' component, the 'auxiliary' component reduces certain charging current, when the voltage of the 'auxiliary' component is lower than that of the 'main' component, the 'auxiliary' component increases certain charging current, the comparison process lasts the whole charging process, when the voltage of any component reaches the highest value, the charging process of all the components is finished, the control module records the 'main and auxiliary' relations and the final charging current of all the membrane capacitor deionization components 3, and the direct current-direct current converter enters the discharging process after stopping charging for a period of time;
step three, when the membrane capacitor deionization assemblies 3 are discharged, the maximum current is used for discharging, when the voltage of any membrane capacitor deionization assembly 3 reaches a set value, the direct current-direct current converter 4 stops charging and discharging the membrane capacitor deionization assemblies, other membrane capacitor deionization assemblies 3 are waited for, when the voltages of all the membrane capacitor deionization assemblies 3 reach the set value, the discharging process is finished, and after the direct current-direct current converter 4 stops charging for a period of time, the next charging process is started;
and step four, starting the next charging process, continuing to use all the relation of the main and the auxiliary and the final charging current of each membrane capacitor deionization component 3, and repeating the comparison process in the step two until the charging voltage of all the membrane capacitor deionization components 3 is similar.
The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (4)
1. A control method of a parallel membrane capacitor deionization system is characterized in that: the method comprises the following steps:
step one, adjusting diaphragm valves after water is introduced into a system, enabling the liquid flow rates of all membrane capacitor deionization assemblies to be the same, and enabling all the membrane capacitor deionization assemblies to enter a discharge state until the voltages of all the membrane capacitor deionization assemblies reach low values;
secondly, when the membrane capacitance deionization assembly is charged, all the membrane capacitance deionization assemblies are charged by the maximum current, after ten seconds of charging, the membrane capacitance deionization assembly with the lowest voltage is a 'main' assembly, and the rest membrane capacitance deionization assemblies are 'auxiliary' assemblies; the electrode current of the 'master' component is unchanged, after each period of time, the 'master' component and the 'slave' component compare voltages with each other, when the voltage of the 'slave' component is higher than that of the 'master' component, the 'slave' component reduces certain charging current, when the voltage of the 'slave' component is lower than that of the 'master' component, the 'slave' component increases certain charging current, the comparison process lasts for the whole charging process, when the voltage of any component reaches the highest value, the charging process of all the components is finished, the control module records the 'master and slave' relationship and the final charging current of all the membrane capacitor deionization components, and the direct current-direct current converter enters the discharging process after stopping charging for a period of time;
step three, when the membrane capacitor deionization components are discharged, the components are discharged at the maximum current, when the voltage of any membrane capacitor deionization component reaches a set value, the direct current-direct current converter stops charging and discharging the components, other membrane capacitor deionization components are waited for, when the voltages of all the membrane capacitor deionization components reach the set value, the discharging process is finished, and after the direct current-direct current converter stops charging and discharging for a period of time, the next charging process is started;
step four, starting the next charging process, continuing to use all the relation of 'main and auxiliary' and the final charging current of each membrane capacitance deionization component, and repeating the comparison process in the step two until the charging voltage of all the membrane capacitance deionization components is similar; the parallel membrane capacitor deionization system comprises a water inlet system, a battery, a membrane capacitor deionization assembly, a direct current-direct current converter and a control module, wherein the battery, the membrane capacitor deionization assembly and the direct current-direct current converter are connected in series through a circuit, a flowmeter is arranged on a water inlet pipe of the membrane capacitor deionization assembly, a diaphragm valve is arranged on a water outlet pipe of the membrane capacitor deionization assembly, water inlet pipes of a plurality of membrane capacitor deionization assemblies are connected in parallel in front of the flowmeter and connected with a water inlet main pipe, water inlet pipes of the plurality of membrane capacitor deionization assemblies are connected in parallel behind the diaphragm valve and connected with a water outlet main pipe, the water inlet system is connected with the water inlet main pipe, and the membrane capacitor deionization assembly and the direct current-direct current converter are connected with the control module through signals.
2. The method of claim 1, wherein the method comprises: the control module is a programmable logic controller.
3. The method of claim 1, wherein the method comprises: and the water inlet main pipe and the water outlet main pipe are respectively provided with a conductivity recorder.
4. The method of claim 1, wherein the method comprises: the water outlet main pipe is respectively connected with a water purifying tank and a waste water tank, a water purifying electromagnetic valve is arranged on a pipeline between the water outlet main pipe and the water purifying tank, a waste water electromagnetic valve is arranged on a pipeline between the water outlet main pipe and the waste water tank, and the water purifying electromagnetic valve and the waste water electromagnetic valve are connected with the control module through signals.
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| CN201910886910.7A CN110745912B (en) | 2019-09-19 | 2019-09-19 | Parallel membrane capacitor deionization system and control method thereof |
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| EP3995458A1 (en) | 2020-11-04 | 2022-05-11 | Voltea | Membrane-capacitive deionization system |
| EP3995459A1 (en) | 2020-11-05 | 2022-05-11 | Voltea | Ion-selective membrane-capacitive deionization system with dynamic management of water quality |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101331088A (en) * | 2005-12-14 | 2008-12-24 | 通用电气公司 | Supercapacitor desalination devices |
| CN107381728A (en) * | 2017-08-14 | 2017-11-24 | 河海大学 | A kind of continuous film capacitive filter processing system and its method of work |
| CN207713549U (en) * | 2017-10-23 | 2018-08-10 | 江苏美淼环保科技有限公司 | A kind of movable type membrane capacitance deionization purifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110019573A (en) * | 2009-08-20 | 2011-02-28 | 삼성전자주식회사 | Capacitive deionization device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101331088A (en) * | 2005-12-14 | 2008-12-24 | 通用电气公司 | Supercapacitor desalination devices |
| CN107381728A (en) * | 2017-08-14 | 2017-11-24 | 河海大学 | A kind of continuous film capacitive filter processing system and its method of work |
| CN207713549U (en) * | 2017-10-23 | 2018-08-10 | 江苏美淼环保科技有限公司 | A kind of movable type membrane capacitance deionization purifier |
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