KR101186677B1 - dehydrator - Google Patents

Abstract

The present invention relates to an electropenetrating dehydration apparatus for dewatering sludge conveyed between a first electrode body and a second electrode body by a voltage difference applied through a first electrode body and a second electrode body which are installed to face each other. And a rectifying part for rectifying the three-phase AC power supply, a charging part for charging the electric energy rectified by the rectifying part, a first coil part for selectively applying a voltage charged in the charging part, and a first coil part. A second coil unit for outputting the induced electromotive force, a switching unit connected to supply and cut off the power charged in the charging unit to the first coil unit, a control unit for controlling the on / off switching unit, one end of the second coil unit and the A secondary diode is connected between the first output terminals leading to the first electrode body, and the other end of the second coil portion is connected to the second electrode body. According to the electro-osmotic dehydration device, it is possible to generate a single-phase pulsed voltage from a three-phase AC power supply, which does not require electrode division and provides an advantage of varying the applied voltage pattern according to the type of sludge. .

Electric penetration dehydrator, rectifier, charging part, pulse modulation

Description

Ultra low power electropenetrating dewatering device {dehydrator}

The present invention relates to a dehydration device, and more particularly, to an electrical penetration dewatering device for applying a voltage to increase the dewatering efficiency.

In general, sludge (sludge) generated in wastewater and sewage treatment plants uses a polymer flocculant to purify water, and sludge aggregated by the polymer flocculant is difficult to dehydrate. According to the sludge dewatering rate, there is a big difference in sludge disposal cost and recycling range. Also, if the water content of sludge can be significantly reduced, not only the waste cost is reduced but also the solid components of the sludge are fueled. It is also very economically added value, such as being able to recycle into a furnace. However, the conventional simple pressurized dewatering device has a limitation in the dewatering of the wastewater sludge, so in recent years, an electropenetrating dewatering device having good dewatering efficiency for dewatering the sludge has been utilized.

The electro-osmotic dewatering device is to remove the sludge-related water by ion mobility. It is a rotating drum which serves as an anode electrode, a water-permeable compression belt formed to surround the outer circumferential surface of the rotating drum, and a dewatering area of the rotating drum and the pressing belt. It consists of a filtration belt formed to overlap the surface.

Japanese Patent Application Laid-Open No. 56-60604 and Korean Patent Application No. 1993-0010856 disclose an electroosmotic sludge dewatering apparatus.

The disclosed electro-osmotic sludge dewatering device forms an electric field by applying a constant voltage between the drum and the pressing belt so that the charged water in the electric field moves to the electrode opposite to the charge carried by the sludge particles by electrophoresis and capillary action. As it is separated, dehydration is carried out from the sludge.

On the other hand, in recent years, three-phase alternating current is rectified for each phase (R, S, T) so that a voltage drop does not occur, and then converted into a DC voltage pulse. An electropenetrating dewatering dehydration device which prevents losses from occurring and also maintains a constant voltage at all times to increase dewatering performance has been proposed by the applicant of 10-2005-0108803 filed by the present applicant.

However, in the case of rectifying the three-phase AC power source, the electrodes should be divided so that the drum or the pressing belt can receive the rectified voltage for each phase. In this case, the structure becomes complicated and the type of sludge Therefore, there is a complicated disadvantage of adjusting it when a different voltage application pattern is to be applied.

The present invention has been made to improve the above problems, and an object of the present invention is to provide an electropenetrating dehydration apparatus capable of providing a single-phase pulse voltage from a three-phase AC power supply while adjusting a voltage pattern to be applied.

In order to achieve the above object, the electroosmotic dewatering device according to the present invention is transferred between the first electrode body and the second electrode body by a voltage difference applied through the first electrode body and the second electrode body which are installed to face each other. An electroosmotic dewatering apparatus for performing dewatering of sludge, comprising: a rectifying unit for rectifying three-phase AC power; A charging unit charging electric energy rectified by the rectifying unit; A first coil part configured to selectively receive a voltage charged in the charging part; A second coil part coupled to the first coil part to output the induced electromotive force; A switching unit connected to supply and cut off the voltage charged in the charging unit to the first coil unit; A control unit which controls the switching unit on / off; And a secondary diode connected between one end of the second coil part and a first output end leading to the first electrode body, and the other end of the second coil part is connected to the second electrode body.

Preferably, the control unit comprises: an adjusting unit configured to set at least one of a switching period, a duty, and a repetition period of the switching unit; And a pulse modulator for controlling the switching unit according to a value set by the adjusting unit.

In addition, the sensing unit for detecting the voltage or current output through the first output terminal; Further, the control unit is configured to control the on / off of the switching unit by determining whether the voltage or current detected by the sensing unit is out of the set allowable range.

According to an aspect of the present invention, the charging unit is a capacitor, and the rectifying unit comprises: first to third diodes connected in a forward direction to each of the R, S and T supply lines of the three-phase AC power source and the capacitor; And fourth through sixth diodes connected in a reverse direction between each of the R, S, and T supply lines and the other end of the capacitor to form a charge current path to the capacitor.

The switching unit may include: a first switch element connected between one end of the capacitor and one end of the first coil part and turned on / off according to a control signal of the controller; And a second switch element connected between one end of the capacitor and the other end of the first coil part and turned on / off according to a control signal of the controller, wherein the middle of the first coil part and the other end of the capacitor are mutually Connected.

According to the electro-osmotic dehydration device according to the present invention, it is possible to generate a single-phase pulsed voltage from a three-phase AC power source, which does not require electrode division, and the advantage of varying the applied voltage pattern according to the type of sludge. To provide.

Hereinafter, with reference to the accompanying drawings will be described in more detail an electroosmotic dewatering apparatus according to a preferred embodiment of the present invention.

1 is a perspective view showing an example of an electroosmotic dewatering device according to the present invention.

Referring to FIG. 1, the dewatering device 10 includes a pressurizing belt 40 for pressurizing and transporting sludge that is infinitely moved by a plurality of rollers and a pressurized belt 40 disposed to face each other on a conveying path of the pressurizing belt 40. The first electrode body 50 and the second electrode body 60 are provided.

The electro-osmotic dewatering device 10 is known in various ways, such as domestic patent application No. 2007-0098334 filed by the present applicant, detailed description thereof will be omitted.

On the other hand, the first electrode body 50 is formed in a drum shape, the second electrode body 60 is a caterpillar, the first electrode body 50 and the second electrode body 60 is a power source described later What is necessary is just to be formed in the form which can dehydrate from the sludge conveyed by the potential difference applied from the part 100, Of course, it is not limited to the form shown.

Hereinafter, the first electrode body 50 and the second electrode body 60 will be described with an equivalent circuit system.

2 is a circuit diagram showing a power applying unit according to the present invention.

Referring to FIG. 2, the power applying unit 100 generates a pulse voltage from a three-phase AC power supply and applies the same through the electrodes 51 and 61 provided on the first electrode body 50 and the second electrode body 60. do.

In the illustrated example, the first electrode body 50 is applied such that the electrode 51 formed on the drum outer circumferential surface is connected to the first output terminal 171, and the second electrode body 60 is circulated in an infinite orbit in the form of a caterpillar and is electrically conductive. The conductive roller which is contacted and rotated to guide the circulation of the second electrode body 60 formed of the material is connected to the electrode 61 of the second electrode body 60 through the second output end 172. Of course, the electrodes 51 and 61 for applying the potential to the first electrode body 50 and the second electrode body 60 may be applied differently from the illustrated example.

The power applying unit 100 includes a rectifying unit 110, a charging unit, a switching unit 130, a control unit 140, first and second coil units 151 and 152, and a secondary diode 161.

The rectifier 110 is configured to charge the capacitor 120 applied to the charging unit by full-wave rectifying the three-phase AC power.

The rectifier 110 is formed of first to sixth diodes 111 to 116.

The first diode 111 is connected to the R-phase supply line 101 of the three-phase AC power supply and the one end 120a of the capacitor 120 in the forward direction.

The second diode 112 is connected in a forward direction to the S-phase supply line 102 of the three-phase AC power supply and one end 120a of the capacitor 120.

The third diode 113 is connected in a forward direction to the T-phase supply line 103 of the three-phase AC power supply and one end 120a of the capacitor 120.

The fourth diode 114 is connected in the reverse direction between the R-phase supply line 101 and the other end 120b of the capacitor 120 to form a charging current path to the capacitor 120.

The fifth diode 115 is connected in the reverse direction between the S-phase supply line 102 and the other end 120b of the capacitor 120 to form a charging current path to the capacitor 120.

The sixth diode 114 is connected in the reverse direction between the T-phase supply line 103 and the other end 120b of the capacitor 120 to form a charge current path to the capacitor 120.

The rectifier 110 has a voltage applied corresponding to the phase difference of each phase of the three-phase AC power source to the first to third diodes 111 to 113, which are forward diodes, and the fourth to sixth diodes 114, 116, which are reverse diodes. By the capacitor 120 is charged.

On the other hand, unlike the illustrated example, the rectifier may be applied to the rectification method different from the illustrated example, such as the half-wave rectification method for the three-phase AC power supply.

The capacitor 120 was applied as a charging unit for charging the electric energy rectified by the rectifying unit 110.

The first coil unit 151 selectively applies power charged in the capacitor 120 to the second coil unit 152 coupled by being selectively applied by the switching of the switching unit 130.

The second coil unit 152 is coupled to the first coil unit 151 to output the induced electromotive force.

The switching unit 130 is connected to supply and cut off the power charged in the capacitor 120 to the first coil unit 151 under the control of the controller 140 to be described later.

As the switching unit 130, first and second switch elements 131 and 132 are applied.

The first switch element 131 is connected between one end 120a of the capacitor 120 and one end of the first coil part 151 to be turned on / off according to a control signal of the controller 140.

The second switch element 132 is connected between one end 120a of the capacitor 120 and the other end of the first coil part 151 to be turned on / off according to a control signal of the controller 140.

Here, the first and second switch elements 131 and 132 are semiconductor devices that are switched on / off according to a control signal. For example, a transistor may be applied.

Here, the second switch element 132 is turned off when the first switch element 131 is turned on, and the second switch element 132 is controlled to be turned on when the first switch element 131 is turned off.

The middle of the first coil part 151 and the other end 120b of the capacitor 120 are connected to each other.

Here, the transformer consisting of the first coil part 151 and the second coil part 152 is preferably a high frequency transformer of several KHz or more.

Unlike the illustrated example, only one switch element may be applied to the switching unit 130. In this case, both ends of the first coil unit 151 are connected to correspond to both ends of the capacitor 120, and the switch element is connected to the first nose. The current conduction path leading to the part 151 may be connected to be turned on or off.

The sensing unit 180 detects a voltage or a current output through the first output terminal 171 and outputs the detected voltage or current to the controller 140.

The controller 140 controls the switching unit 130 on / off according to the set pulse modulation signal.

The control unit 140 switches according to a pulse modulating signal set by the adjusting unit 142 provided with an operation key so that a user can set at least one of a switching period, a duty, and a repetition period of the switching unit 130 and the adjusting unit 142. A pulse modulator 141 for controlling the unit 130 is provided.

In addition, the controller 140 determines whether the voltage or current detected by the sensing unit 180 is outside the set allowable range, and controls the on / off of the switching unit 130.

For example, if it is determined that the voltage detected by the sensing unit 180 is an overvoltage of a predetermined voltage or an overcurrent of a predetermined allowable current, the controller 140 may forcibly reduce or turn off the driving duty of the switching unit 130. To control.

The secondary diode 161 is connected in a forward direction between one end of the second coil part 152 and the first output terminal 171 leading to the first electrode body 50 to absorb the electrical energy induced in the second coil part 152. Half-wave rectified and output.

The other end of the second coil portion 152 becomes the second output terminal 172 and is connected to the second electrode body 60.

For example, as shown in FIG. 3, the electric penetration dewatering device 10 may include the first and the first powers according to the driving period T and the duty a / T of the switching unit 130 of the pulse modulator 141. The voltage in the form of a pulse is generated through the two output terminals 171 and 172.

Therefore, the electroosmotic dewatering device 10 may adjust the amplitude, period, duty, repetition period, etc. of the voltage waveform output through the first and second output terminals 171 and 172 according to the type of sludge applied. The voltage application conditions corresponding to the characteristics of can be applied.

1 is a perspective view showing an example of an electroosmotic dehydrator according to the present invention;

FIG. 2 is a circuit diagram illustrating a power supply unit for applying a potential to the first and second electrode bodies of FIG. 1.

3 is a waveform diagram illustrating an output waveform output from the potential applying unit of FIG. 2.

Claims (4)

delete delete delete In the electro-osmotic dewatering apparatus for performing the dehydration of the sludge transferred between the first electrode body and the second electrode body by the voltage difference applied through the first electrode body and the second electrode body which are installed opposite to each other, Rectifying unit for rectifying three-phase AC power supply; A charging unit charging electric energy rectified by the rectifying unit; A first coil part configured to selectively receive a voltage charged in the charging part; A second coil part coupled to the first coil part to output the induced electromotive force; A switching unit connected to supply and cut off power charged in the charging unit to the first coil unit; A control unit which controls the switching unit on / off; And a secondary diode connected between one end of the second coil portion and a first output end leading to the first electrode body. The other end of the second coil portion is connected to the second electrode body, The controller may include an adjusting unit configured to set at least one of a switching period, a duty, and a repetition period of the switching unit; And a pulse modulator for controlling the switching unit according to a value set by the adjusting unit. The switching unit A first switch element connected between one end of the charging unit and one end of the first coil unit and turned on / off according to a control signal of the controller; A second switch element connected between one end of the charging unit and the other end of the first coil unit and turned on / off according to a control signal of the controller; And a middle of the first coil portion and the other end of the charging portion are interconnected with each other.

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