KR102578916B1 - Power system for water treatment capacitve desalination ionization module - Google Patents

Abstract

The water treatment CDI module power system according to the present invention includes a CDI module that removes ionic substances in raw water using the electric double layer principle; It includes a power supply unit that provides power supplied to the CDI module in water purification and regeneration modes; and a control unit that controls the CDI module and the power supply unit, wherein the power supply unit includes a commercial power supply that supplies commercial power; a three-phase rectifier that rectifies the commercial power; A DC/DC converter for converting the DC voltage rectified in the three-phase rectifier; and a bipolar converter connected to the output terminal of the DC/DC converter to control the power supplied to the CDI module, wherein the DC/DC converter includes It is composed of an insulated type and includes an output capacitor at the output terminal. The CDI module is repeatedly driven in alternating purification mode and regeneration mode, and the power supplied to the CDI module between the purification mode and regeneration mode is short. Having a short section, the CDI module has a power recovery section except for the initial drive when driven, and the power stored in the CDI module in the power recovery section is recovered to the output capacitor, and the output capacitor has a power recovery section except for the initial drive. Its characteristic feature is that it provides some of the power required to drive the CDI module when the CDI module is in water purification mode and regeneration mode.
According to the present invention, a power recovery section is provided after the purification mode and regeneration mode to recover the power of the CDI module to the output capacitor, and the recovered power can be supplied as part of the power to the purification mode and regeneration mode operation excluding the initial drive. .

Description

Power system for water treatment CDI module {Power system for water treatment capacitve desalination ionization module}

The present invention relates to a power system for a water treatment CDI module. In particular, a power recovery section is provided after the water purification mode and regeneration mode to recover the power of the CDI module to the output capacitor, and the recovered power is used in the water purification mode and regeneration mode excluding the initial drive. It relates to a power system for a water treatment CDI module that supplies some of the power to drive in regenerative mode.

Desalination is defined as a series of processes to obtain fresh water that can be used for drinking or other purposes by removing salts dissolved in salt water such as seawater or brackish water. At first, it was used as a way to secure water for ships sailing for long periods of time or in remote island areas where water is scarce.

Globally, the demand for seawater desalination has increased since the 1960s as areas with water shortages have expanded due to population growth, improvement in living standards, and extreme weather events, and the number of installation examples has been rapidly increasing.

There are several technologies for desalinating water. Examples include evaporative desalination, refrigeration-based desalination, reverse osmosis membrane-based desalination, electrodialysis-type seawater desalination, and electro-adsorption-type seawater desalination. Among these, the electroadsorption method has advantages such as low energy consumption, environmental friendliness, semi-resolution, convenient operation, and high ion removal rate. In particular, it has the advantage of lower power consumption compared to the evaporation method and reverse osmosis membrane method.

Among the electro-adsorption methods, the Capacitive Desalination Ionization (CDI) method is a method that enables continuous processing and consumes less energy among the electro-adsorption methods, and is a method in which research and technology development are actively taking place in recent years.

In the case of the CDI method, water purification performance varies greatly depending on the shape of the module electrode, the configuration of the adsorption module, as well as the type and current of the voltage applied to the module electrode, application time, etc., so various methods have been proposed to increase water purification efficiency. there is.

However, the conventional system shows relatively low water purification efficiency due to the inability to efficiently drive the CDI module and control the module linked to the state of the input water. As the existing method has poor applied voltage and current control performance, these various It is difficult to operate the system in this way.

Domestic Registered Patent No. 10-2164392

The purpose of the present invention is to provide a power recovery section after the purification mode and regeneration mode to recover the power of the CDI module to the output capacitor, and to supply some of the recovered power to the purification mode and regeneration mode operation excluding the initial drive. do.

The water treatment CDI module power system according to the present invention for achieving the above task includes a CDI module that removes ionic substances in raw water using the electric double layer principle; It includes a power supply unit that provides power supplied to the CDI module in water purification and regeneration modes; and a control unit that controls the CDI module and the power supply unit, wherein the power supply unit includes a commercial power supply that supplies commercial power; a three-phase rectifier that rectifies the commercial power; A DC/DC converter for converting the DC voltage rectified in the three-phase rectifier; and a bipolar converter connected to the output terminal of the DC/DC converter to control the power supplied to the CDI module, wherein the DC/DC converter includes It is composed of an insulated type and includes an output capacitor at the output terminal. The CDI module is repeatedly driven in alternating purification mode and regeneration mode, and the power supplied to the CDI module between the purification mode and regeneration mode is short. Having a short section, the CDI module has a power recovery section except for the initial drive when driven, and the power stored in the CDI module in the power recovery section is recovered to the output capacitor, and the output capacitor has a power recovery section except for the initial drive. Its characteristic feature is that it provides some of the power required to drive the CDI module when the CDI module is in water purification mode and regeneration mode.

Here, in particular, the power supply unit further includes a DB resistor unit between the DC/DC converter and the bipolar converter, and the DB resistor unit is characterized in that it prevents damage to the output capacitor.

Here, in particular, the DB resistance unit is composed of a resistor and a resistance switch, and the control unit monitors the voltage of the output capacitor and turns on the resistance switch when the voltage of the output capacitor is higher than the set voltage. there is.

Here, in particular, the bipolar converter is composed of a first switch, a second switch, a third switch, and a fourth switch, and the control unit controls the first switch and the fourth switch when driving the CDI module in integer mode. It is characterized in that a positive potential is applied to the CDI module by turning on, and a negative potential is applied to the CDI module by turning on the second and third switches when the CDI module is driven in a playback mode.

According to the present invention, a power recovery section is provided after the purification mode and regeneration mode to recover the power of the CDI module to the output capacitor, and the recovered power can be supplied as part of the power to the purification mode and regeneration mode operation excluding the initial drive. .

Figure 1 is a diagram showing the configuration of a power system for a water treatment CDI module according to an embodiment of the present invention.
FIG. 2 is a circuit diagram showing the configuration of the power supply unit of FIG. 1.
Figure 3 is a diagram showing voltage over time when driving a CDI module according to an embodiment of the present invention.
4 to 7 are diagrams showing power flow according to an embodiment of the present invention.

Hereinafter, the configuration and operation of an embodiment of the present invention will be described with reference to the attached drawings.

It should be noted that the same components among the drawings are indicated with the same reference numbers and symbols as much as possible, even if they are shown in different drawings. In describing the present invention below, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Additionally, when a part "includes" a certain component, this means that it may further include other components, rather than excluding other components, unless specifically stated to the contrary.

In addition, terms and words used in the specification and claims should not be interpreted in their usual, dictionary meaning, and the inventors may appropriately define the concept of terms to explain their inventions in the best way. It must be interpreted as meaning and concept consistent with the technical idea of the present invention based on principles. Therefore, the embodiments described in this specification and the configurations shown in the drawings are only preferred embodiments of the present invention, and do not represent the entire technical idea of the present invention, and therefore, various equivalents can be substituted for them at the time of filing the present application. There may be variations and the scope of the present invention is not limited to the embodiments described below.

Figure 1 is a diagram showing the configuration of a power system for a water treatment CDI module according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing the configuration of the power supply unit of FIG. 1.

Referring to Figures 1 and 2, the power system for the water treatment CDI module according to the present invention includes a power supply unit 100, a CDI module 200, and a control unit 300.

The CDI module 200 removes ionic substances in raw water using the electric double layer principle.

In the CDI module (Capacitive DeIonization, CDI), ionic substances move to the electrode surface and are adsorbed by an adsorption reaction in the electric double layer formed on the electrode surface when a potential is applied to the electrode. When the capacity reaches its limit, the charged electrode is discharged to desorb ionic substances, thereby regenerating the electrode. In other words, the CDI module can remove ionic substances in raw water by repeating the purification mode and regeneration mode.

More specifically, the CDI module includes a positive electrode and a negative electrode, and in water purification mode, when a positive potential is applied to the positive electrode and a negative potential is applied to the negative electrode, negative ions in the raw water are adsorbed to the positive electrode and positive ions are adsorbed to the negative electrode.

Afterwards, in the regeneration mode, a negative potential is applied to the positive electrode and a positive potential is applied to the negative electrode, or the electrodes (positive and negative electrodes) are short-circuited. At this time, the ions adsorbed on the positive and negative electrodes are desorbed from the electrodes.

The power supply unit 100 provides power to the CDI module 200 in water purification and regeneration modes.

The control unit 300 controls the CDI module 200 and the power supply unit 100.

The power supply unit 100 may be configured to include a commercial power source 10, a three-phase rectifier 110, a DC/DC converter 130, a DB resistor unit 150, and a bipolar converter 170.

The commercial power supply 10 supplies commercial power for driving the CDI module 200.

The three-phase rectifier 110 is connected to the commercial power source 10 and can rectify AC power supplied from the commercial power source 10.

The DC/DC converter 130 converts the direct current voltage rectified in the three-phase rectifier 110. The DC/DC converter 130 is configured as an insulated type and may include an output capacitor at the output terminal.

More specifically, the DC/DC converter 130 includes a first module 131, an isolation transformer 132, a second module 133, and an output capacitor 135.

The first module 131 receives the direct current voltage rectified by the three-phase rectifier 110 and forms the primary voltage of the insulation transformer 132. The first module 131 may be composed of two switches and two capacitors as shown in FIG. 2. However, it is not limited to the configuration shown in FIG. 2.

The second module 133 forms the secondary voltage of the insulation transformer 132. The second module 133 may be composed of four diodes as shown in FIG. 2. However, it is not limited to the configuration shown in FIG. 2.

The output capacitor 135 is provided at the output terminal of the DC/DC converter 130 and can store power recovered from the CDI module 200.

The CDI module 200 is repeatedly driven in alternating purification mode and regeneration mode, and repeatedly adsorbs and desorbs ions while repeating purification mode and regeneration mode.

When the CDI module 200 is driven, it has a short section in which the power supplied to the CDI module is shorted between the constant mode and the playback mode.

There may be a power recovery section from a certain period of time after driving the water purification mode and the regeneration mode until just before the short section.

In the power recovery section, the CDI module 200 stores the power stored in the CDI module 200 in the output capacitor 135, and the power stored in the output capacitor 135 in the purification mode and regeneration mode excluding the initial drive. It is possible to provide a portion of the driving power required to drive the CDI module.

That is, except for the initial operation, power to the CDI module 200 is supplied from the commercial power supply 10 and the output capacitor 135.

The DB resistance unit 150 is disposed between the DC/DC converter 130 and the bipolar converter 170 to prevent damage to the output capacitor 135. When the CDI module 200 recovers power, the recovered power is stored in the output capacitor 135, and the voltage of the output capacitor 135 increases. When the voltage of the output capacitor 135 rises above a certain voltage, there may be a risk of damage to the output capacitor 135.

The DB resistance unit 150 may be composed of a resistor 151 and a resistance switch 153.

The control unit 300 may monitor the voltage of the output capacitor 135.

The control unit 300 can set the maximum voltage of the output capacitor 135. The maximum voltage may vary depending on the capacity of the output capacitor.

When the monitoring voltage of the output capacitor 135 is higher than the set voltage, the control unit 300 turns on the resistance switch 153 to allow the power recovered from the CDI module 200 to flow to the resistor 151 to output the output. The voltage on the capacitor 135 can be controlled so that it does not exceed a certain voltage.

The control unit 300 may be separately provided with a monitoring unit (not shown) necessary for monitoring the output capacitor 135 and a voltage setting unit (not shown) necessary for setting the maximum voltage.

The bidirectional bipolar converter 170 is connected to the output terminal of the DC/DC converter 130 to control the power supplied to the CDI module 200.

More specifically, the bipolar converter 170 is composed of four switches, a first switch 171, a second switch 172, a third switch 173, and a fourth switch 174, and is configured to operate the CDI module ( 200).

The four switches 171-174 can be controlled by the control unit 300.

In one embodiment, the control unit 300 turns on the first switch 171 and the fourth switch 174 to apply a positive potential to the CDI module 200 to drive it, and the CDI module 200 operates by turning on the first switch 171 and the fourth switch 174. It operates in mode.

In addition, the control unit 300 turns on the second switch 172 and the third switch 173 to apply a negative potential to the CDI module 200 to drive it, and the CDI module 200 operates in playback mode. do.

Figure 3 is a diagram showing voltage over time when driving a CDI module according to an embodiment of the present invention.

4 to 7 are diagrams showing power flow according to an embodiment of the present invention.

Referring to FIGS. 3 to 7, the power system for the water treatment CDI module according to the present invention starts the initial operation of the CDI module 200 to operate in the water purification mode. Referring to Figures 3 and 4, during initial operation, power is supplied to the CDI module 200 only with power supplied from the commercial power supply 10. During initial operation, the first switch 171 and the fourth switch 174 are turned on to drive the water purification mode, and a positive potential is applied to the CDI module 200 to drive the water purification mode for a certain period of time. After time t1 after starting the water purification mode, the voltage applied to the CDI module 200 decreases and enters the power recovery period (R1).

Referring to FIG. 5, in the power recovery section (R1), the power stored in the CDI module 200 is recovered and stored in the output capacitor 135. The power recovery section (R) continues until the short section (S1) begins. In Figure 3, the short section (S) and the power recovery section (R) are divided, but depending on the power recovered, the short section (S) and the power recovery section (R) may overlap.

In the short section (S), the voltage applied to the output capacitor 135 can be controlled. More specifically, referring to FIG. 6, the control unit 300 can monitor the voltage applied to the output capacitor 135, that is, the voltage of node 1 (N1), and the voltage of node 1 (N1) is set. If the voltage is higher than the voltage, the voltage applied to the output capacitor 135 is controlled. Voltage control can be performed through the DB resistance unit 150 disposed behind the output capacitor 135. When the voltage of node 1 (N1) is higher than the set voltage, the control unit 300 turns on the resistance switch 153 to flow the power recovered to the resistor 151 to change the voltage applied to node 1 (N1). can be controlled.

Referring to FIG. 7, when the short section (S1) ends, the control unit 300 controls the second switch 172 and the third switch 173 to be turned on, and the second switch 172 and the third switch 173 are turned on. As (173) is turned on, a negative potential is applied to the CDI module 200, and the CDI module 200 is driven in playback mode. When driving in regenerative mode, unlike the initial operation, the power supplied from the commercial power supply 10 (① in FIG. 7) and the power supplied from the output capacitor 135 (② in FIG. 7) are both supplied to the CDI module 200. (③ in Figure 7).

As shown in FIG. 3, except for the initial drive, the CDI module 200 is driven with recovered power and power supplied from a commercial power source, thereby enabling efficient use of energy.

The control unit 300 can set a power recovery section. In one embodiment, the power recovery section can be set through voltage monitoring of the CDI module 200. For example, when the voltage of the CDI module 200 falls below a certain voltage, it is recognized as a power recovery section and the CDI module 200 can be driven to recover the power stored in the output capacitor 135. For this purpose, the control unit 300 may be separately equipped with a monitoring unit (not shown) that monitors the voltage of the CDI module 200. In other words, the point when the voltage of the CDI module drops below 300V in water purification mode and -300V or below in regeneration mode can be set as the start point of the power recovery section. In another embodiment, the starting point of the power recovery section may be time. As shown in FIG. 3, after starting the water purification and regeneration mode, a certain time point t1 and t2 can be set as the time point of the power recovery section. Additionally, it may also be possible to set the voltage monitoring and time described above in parallel.

The end point of the power recovery section can be the time when the water purification mode and regeneration mode start.

The scope of the present invention is not limited to the above-described embodiments, but may be implemented in various forms of embodiments within the scope of the attached patent claims. It is deemed to be within the scope of the claims of the present invention to the extent that anyone skilled in the art can make modifications without departing from the gist of the invention as claimed in the claims.

10 Commercial power 100 Power supply unit
110 3-phase rectifier 130 DC/DC converter
131 1st module 132 Isolated transformer
133 2nd module 135 output capacitor
150 DB resistance section 151 resistance
153 Resistance switch 170 Bidirectional polarity converter
171 1st switch 172 2nd switch
173 3rd switch 174 4th switch
200 CDI module 300 control unit

Claims (4)

CDI module that removes ionic substances in raw water using the electric double layer principle;
A power supply unit that provides power supplied to the CDI module during water purification and regeneration modes; and
It includes a control unit that controls the CDI module and the power supply unit,
The power supply unit,
Commercial power supply that supplies commercial power;
a three-phase rectifier that rectifies the commercial power;
A DC/DC converter that converts the direct current voltage rectified in the three-phase rectifier; And
It includes a bipolar converter connected to the output terminal of the DC/DC converter to control the power supplied to the CDI module,
The DC/DC converter is,
A first module that receives the rectified direct current voltage from the three-phase rectifier and forms a primary side voltage of the insulation transformer;
A second module forming the secondary voltage of the insulation transformer; And
An output capacitor provided at the output terminal of the DC/DC converter and storing power recovered from the CDI module,
The power supply unit further includes a DB resistance unit between the DC/DC converter and the bi-polar converter,
The DB resistance unit,
It consists of a resistor and a resistance switch,
The control unit monitors the voltage of the output capacitor,
When the voltage of the output capacitor is higher than the set voltage, turn on the resistance switch,
The output capacitor provides some power required to drive the CDI module in the CDI module constant mode and regeneration mode, excluding initial operation.
Power system for water treatment CDI module. delete delete delete

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