KR101854437B1 - Apparatus for removing scale of cooling water automatically - Google Patents

Abstract

The present invention relates to a device for automatically removing scale from cooling water. According to the present invention, the device for automatically removing scale from cooling water comprises: a first electrolysis unit having a cylindrical housing shape and forming an electrode on the inner surface; a second electrolysis unit inserted into the first electrolysis unit and forming an electrode opposite to that of the first electrolysis unit on the outer surface; a cooling water inflow unit connected to the upper part of the first electrolysis unit in a tangential direction and forming a vortex by enabling cooling water to flow between the first electrolysis unit and second electrolysis unit by a pump; a hopper having the shape of a reverse cone pipe that is connected to the lower part of the first electrolysis unit, wherein the hopper collects and discharges the cooling water descending from the first electrolysis unit; a filter unit installed on the lower side of the hopper and filtering scale included in the cooling water; a power supply unit supplying current to the first electrolysis unit and second electrolysis unit; and a control unit controlling the electrode of the first electrolysis unit and second electrolysis unit for the electrode of the first electrolysis unit and second electrolysis unit to be changed. A conductivity sensor measuring the electrical conductivity of the cooling water is installed on the cooling water inflow unit. So, the control unit controls the current supplied by the power supply unit in accordance with the range of measurement values by receiving the measurement value from the conductivity sensor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a scale removing apparatus, and more particularly, to an apparatus for automatically removing a scale of cooling water which automatically removes various scales contained in cooling water by electrolysis.

Industrial water such as cooling water of cooling equipment contains TDS (Total Dissolved Solid) component. Of these components, cations such as Ca, Mg and SiO ₂ are combined with anions such as HCO ₃ and OH dissolved in cooling water, CaCO ₃ , Ca (OH) ₂ , Mg (OH) ₂ and SiO ₂ are produced, and these oxides are fixed inside the pipe or heat exchanger to form scale.

Scale must be periodically removed because it interferes with the flow of water and lowers heat exchange efficiency, resulting in various losses such as reduced productivity, increased power consumption, and shortened equipment life.

Figure 1 shows a conventional scale component removal device.

The conventional scale component removing apparatus includes a reactor 1, an anode 2, a DC power supply 3 and a scale discharge pipe 5, and is connected to an external ultrasonic oscillator 6 in the reactor 1, And an ultrasonic transducer 4 for generating ultrasonic waves.

When water is introduced into the reactor 1 and an electric current is applied between the reactor 1 and the anode 2 functioning as a cathode, an electrolysis reaction of water proceeds to remove the scale component of the water, The hydroxyl group generated in the cathode (1) reacts with bicarbonate ions contained in the water to generate carbonate ions. The generated carbonate ion reacts with the calcium ion contained in the water to produce calcium carbonate, so that the calcium carbonate is deposited on the negative electrode 1 as a scale.

When calcium carbonate is precipitated, calcium carbonate is separated from the surface of the negative electrode 1 by the vibration of the ultrasonic vibrator 4 and discharged to the outside through the scale discharge pipe 5.

The vibration of the ultrasonic transducer 4 is used to separate the scale deposited on the cathode from the cathode 1 in the prior art but it is difficult to transmit the vibration of the ultrasonic transducer 4 to the entire inner surface of the reactor 1 The scale can not be sufficiently eliminated, and the remaining scale obstructs the scale component precipitation action. Further, the disposition of the plurality of ultrasonic transducers 4 in the reactor 1 complicates the construction and increases the installation cost of the apparatus. In addition, although the water can sufficiently increase the precipitation efficiency of the scale component by sufficiently contacting the cathode 1 with the cathode 1, the water in the center of the interior of the reactor 1 does not sufficiently contact the inner surface of the reactor 1 Therefore, it takes a considerable processing time to remove the scale component of the entire water to an appropriate level.

To solve this problem, Korean Patent Registration No. 10-1538782 discloses a technique capable of increasing the treatment capacity while improving the removal efficiency of scale components contained in water.

However, even in the case of the improved treatment apparatus, since the pump constantly supplies the constant current irrespective of the amount of the scale inducing component contained in the cooling water, the power consumption is severe. That is, it is very inefficient to operate the apparatus in the same operation state because the amount of the scale inducing component is different according to the type of cooling water and the operation state such as water, ground water, industrial water used as cooling water.

- Korean Registered Patent No. 10-1538782 (July 16, 2015) "Scale component removal device for water" - Korean Registered Patent No. 10-1055990 (Aug. 4, 2011) "Scale removal device by electrochemical reaction and its removal method" - Korean Registered Patent No. 10-1787649 (Oct. 10, 2017) "Cooling Water Scale Treatment Apparatus"

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an apparatus and method for automatically scaling cooling water, which can efficiently consume power by controlling the operation state of the apparatus according to the amount of scale- .

To achieve the above object, according to the present invention, there is provided an apparatus for automatically removing scale of cooling water, comprising: a first electrolytic unit forming a cylindrical housing shape and forming an electrode on the inner surface; A second electrolytic unit inserted into the first electrolytic unit and forming an electrode on an outer surface of the first electrolytic unit and having an opposite polarity to the first electrolytic unit; A cooling water inflow part communicating with the upper part of the first electrolytic part in a tangential direction and having a pump to introduce cooling water between the first electrolytic part and the second electrolytic part to form a vortex; A hopper which has an inverted conical shape and communicates with a lower portion of the first electrolytic unit to collect and discharge the cooling water descending from the first electrolytic unit; A filtering unit provided under the hopper for filtering a scale included in the cooling water; A power supply unit for supplying a current to the first electrolysis unit and the second electrolysis unit; And an electric conductivity sensor for measuring the electric conductivity of the cooling water is provided on the cooling water inflow portion, and the control portion controls the electric conductivity of the cooling water in the first and second electrolysis portions, The measured value is input from the electric conductivity sensor, and the current supplied from the power supply unit can be controlled according to the measured value range.

Here, the controller may supply a current of 25 to 40% of a maximum allowable current in the power supply unit when the measured value of the electric conductivity measured by the electric conductivity sensor is within the set range, and when the measured value of the electric conductivity is less than the set range The power supply unit supplies a current of 12.5% or less of the maximum allowable current, and when the value of the electric conductivity exceeds the set range, the power supply unit can control to supply 50 to 70% of the maximum allowable current.

According to another aspect of the present invention, there is provided an apparatus for automatically removing scale of cooling water, comprising: a first electrolytic unit forming a cylindrical housing shape and forming an electrode on the inner surface; A second electrolytic unit inserted into the first electrolytic unit and forming an electrode on an outer surface of the first electrolytic unit and having an opposite polarity to the first electrolytic unit; A cooling water inflow part communicating with the upper part of the first electrolytic part in a tangential direction and having a pump to introduce cooling water between the first electrolytic part and the second electrolytic part to form a vortex; A hopper which has an inverted conical shape and communicates with a lower portion of the first electrolytic unit to collect and discharge the cooling water descending from the first electrolytic unit; A filtering unit provided under the hopper for filtering a scale included in the cooling water; A power supply unit for supplying a current to the first electrolysis unit and the second electrolysis unit; And an electric conductivity sensor for measuring the electric conductivity of the cooling water is provided on the cooling water inflow portion, and the control portion controls the electric conductivity of the cooling water in the first and second electrolysis portions, The flow rate can be controlled by controlling the RPM of the pump according to the measured value range by receiving the measured value from the electric conductivity sensor.

At this time, when the electric conductivity measured value measured by the electric conductivity sensor is within the set range, the RPM of the pump operates at RPM of 60 to 70% of the maximum RPM, and if the electric conductivity value is less than the set range The RPM of the pump operates at RPM of 30% or less of the maximum operation RPM, and when the electric conductivity value exceeds the set range, the RPM of the pump can be controlled to operate at RPM of 90% or more of the maximum operation RPM.

Meanwhile, an air vent for discharging gas generated in the first electrolytic unit may be provided on the first electrolytic unit.

According to the present invention configured as described above, unnecessary power consumption can be greatly reduced by controlling the amount of current supplied from the power supply unit or controlling the number of rotations of the pump according to the amount of the scale inducing component included in the cooling water to be treated There is an effect.

Figure 1 shows a conventional scale component removal device
2 is a schematic view showing a structure of a device for automatically removing scale of cooling water according to an embodiment of the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

For a better understanding of the present invention, the description with reference to the drawings is not intended to limit the scope of the present invention. In the following description, a detailed description of related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily blurred.

2 is a configuration diagram showing a structure of an apparatus for automatically removing scale of cooling water according to an embodiment of the present invention.

The present invention relates to a scale removing apparatus for recovering cooling water used for various facilities and supplying various scaling-inducing components contained in the cooling water after electrolytically removing the scale-induced components, A second electrolysis unit 200, a cooling water inflow unit 300, a hopper 400, a filtering unit 500, a power supply unit 600, a control unit 700, and an electric conductivity sensor 800 .

First, the first electrolysis unit 100 is installed in the shape of a cylindrical housing that is vertically erected and has a housing space therein. The electrode plate 110 is formed on the inner circumferential surface of the first electrolysis unit 100, do.

The upper end of the first electrolytic unit 100 is closed and the lower end of the first electrolytic unit 100 is connected to the hopper 400 so as to be continuous with the inner circumferential surface of the hopper 400.

At this time, the electrode plate 110 of the first electrolysis unit 100 is electrically connected to the cathode of the power supply unit 600, and therefore, it is required to be made of a conductive material, and a conductive metal may be used.

Here, the first electrolysis unit 100 is controlled by the control unit 700 to be temporarily switched to an anode in the removal mode in which the precipitated scale is disconnected although it is connected to the cathode in the precipitation mode in which the scale component is precipitated in the cooling water .

Next, the second electrolytic unit 200 is inserted into the center of the first electrolytic unit 100 and installed vertically, and is arranged to be concentric with the first electrolytic unit 100.

The lower end of the second electrolytic unit 200 is not opened but is clogged and the outer circumferential surface forms an electrode plate 210 and is electrically connected to the power supply unit 600. At this time, the electrode plate 210 on the outer circumferential surface of the second electrolytic unit 200 is formed in a polarity opposite to that of the electrode plate 110 of the first electrolytic unit 100. As described above, The first electrolysis unit 100 is connected to the cathode, and the second electrolysis unit 200 is connected to the anode.

On the other hand, in the removal mode, the polarity is switched and the second electrolysis unit 200 is temporarily formed as a cathode.

The second electrolytic unit 200 serving as an anode may be formed of a single tubular body made of titanium and may be formed of iridium oxide (IrO ₂ ), ruthenium oxide (RuO ₂ ), platinum (Pt) , Carbon, or a combination of two or more materials.

Next, the cooling water inflow part 300 is connected to the upper part of the first electrolysis part 100 so that the cooling water supplied from the cooling water supply water tank (not shown) is introduced into the first electrolysis part 100 .

At this time, the cooling water inflow part 300 is deflected in a tangential direction with reference to a circular cross-section of the first electrolysis part 100, so that the cooling water flowing into the cooling water inflow part 300 flows into the inner circumferential surface of the first electrolysis part 100, 2 electrolytic unit 200 and descends while forming a vortex of the spiral.

This is to allow the cooling water to remain in contact with the electrode plates of the first electrolysis part 100 and the second electrolysis part 200 for a longer time to increase the deposition amount of the scale.

Meanwhile, a pump 900 is provided between the supply water tank and the cooling water inflow part 300 to supply and circulate the cooling water, and to adjust the supply amount.

Next, a hopper 400 is provided at a lower portion of the first electrolysis unit 100.

The hopper 400 has a substantially inverted conical shape and is connected to the lower part of the first electrolytic unit 100 to communicate with the lower part of the first electrolytic unit 100.

The electrolyzed and cooled water while forming a vortex in the first electrolytic unit 100 and the dropped scale are collected in the hopper 400 and discharged to the lower side.

The inclined surface in the hopper 400 may be continuous with the inner circumferential surface of the first electrolysis unit 100.

On the other hand, a filtering unit 500 is provided below the hopper 400.

The filtering unit 500 may be formed in a net shape, and the cooling water is passed therethrough and the scale and suspended solids contained in the cooling water are filtered.

The filtering unit 500 may have a structure in which the filtering unit 500 can be easily installed or removed, and the filtering unit 500 may be emptied or replaced when the scale is filled.

Next, the power supply unit 600 will be described.

The power supply unit 600 is electrically connected to the first and second electrolysis units 100 and 200 to supply power.

Basically, in the deposition mode, the first electrolysis unit 100 supplies current so that the inner circumferential surface becomes the cathode and the outer circumferential surface of the second electrolysis unit 200 becomes the anode. However, in the removal mode, the polarity is temporarily changed so that the first electrolysis unit 100 is a positive electrode and the second electrolysis unit 200 is a negative electrode.

It is a matter of course that the rectifier 610 is provided in the power supply unit 600 so that the alternating current is converted into direct current and supplied. (Not shown) for measuring the coarse voltage between the anode and the cathode, or a resistance calculating unit (not shown) for calculating the resistance.

Next, the control unit 700 of the present invention basically performs control functions such as current supply, pump operation, precipitation mode and removal mode judgment and switching of the power supply unit 600, and accordingly polarity switching and time control.

For example, if the condition that the coercive voltage or resistance between the inner circumferential surface of the first electrolytic section 100 and the outer circumferential surface of the second electrolytic section 200 becomes higher than the set value due to the increase in the operation set time interval and the scale is satisfied , The polarity switching can be controlled.

The polarity change hold time is a time for the precipitated scale to fall off entirely from the inner circumferential surface of the first electrolytic unit 100, and may be set to a predetermined time, or may be maintained until the coarse voltage or resistance is lowered to a set value or less .

Then, when the polarity converted by the controller 700 is returned to the original state, the precipitation mode proceeds again.

In addition, the controller 700 may operate the air vent 120 to periodically discharge the gas.

However, in the present invention, in order to achieve a more efficient operation while minimizing power consumption during the scale precipitation operation, the amount of the scale included in the cooling water is measured in advance, and the amount of current or the number of rotations of the pump is controlled .

First, an electric conductivity sensor 800 for measuring the electric conductivity of the cooling water may be installed on the cooling water inflow part 300. That is, it can be installed on a pipe connecting the pump 900 and the cooling water inflow part 300.

The electrical conductivity is expressed as the reciprocal of the resistance and can be an indicator of the concentration of the dissolved substance in the water. Because, the more ions in the water, the more easily the current flows and the higher the electric conductivity.

The electrical conductivity sensor 800 uses a digital measurement value, and the unit uses s (siemens) / m, or μs (micosiemens) / cm.

The measured electrical conductivity value is sent to the controller 700 and can be controlled to control the amount of current supplied from the power supplier 600. That is, since it is determined that the scale component is larger as the electric conductivity increases, the amount of the current supplied to the first electrolytic unit 100 and the second electrolytic unit 200 may be increased to activate the precipitation operation. Conversely, if the electric conductivity is lowered, it is judged that the scale component is small, so that the power supply can be reduced to minimize the power consumption.

Specifically, the range of electrical conductivity measurement values can be controlled by dividing into three regions.

Generally, the range of the electric conductivity measurement value for the average scale amount included in the most cooling water is set to a basic setting range and an appropriate current is supplied.

In the case of less than the basic setting range, the electric conductivity is relatively low, so that the scale component is less than the average, so that the supply of current is controlled to be lowered.

In addition, when the basic setting range is exceeded, since the electric conductivity is relatively high and the scale component is included more than the average, control is performed to increase the current supply.

According to Faraday's Law of Electrolysis, the amount of the substance deposited on the electrode in electrolysis is proportional to the amount of charge. Since the amount of charge corresponds to the product of current and time, the amount of the precipitated substance increases when the current is increased.

Generally, the electric conductivity setting range corresponding to the amount of the average scale component included in most of the cooling water can be set in the range of 300 to 1000 μs / cm to the default setting range.

This means that when the apparatus is operated for about 15 days, the amount of scale precipitated from the general cooling water is about 50 to 100 g.

Here, according to the experience of performing a long scale removing operation, the scale-induced component sharply decreases when the electric conductivity is less than 300 μs / cm, and the scale-induced component sharply increases when the electric conductivity exceeds 1000 μs / cm.

When the electrical conductivity is within the set range, the current supplied from the power supply unit 600 preferably supplies a current of about 25 to 40% of the maximum current value that can be supplied.

For example, when the maximum supply allowable current of the power supply unit 600 is 20 A, a current of about 5 to 8 A can be supplied when the electric conductivity is within the default setting range.

Next, if the electrical conductivity is less than the default setting, the electrical conductivity can be set to less than 300 μs / cm, which amounts to less than about 10 g of precipitation at 15 days of operation. In this case, even if only the current of 12.5% or less of the maximum current value is supplied, there is not much difficulty in descaling operation. That is, when the maximum supply allowable current is 20 A, a current of 2.5 A or less can be supplied.

Next, when the electrical conductivity exceeds the default setting range, the electrical conductivity can be set in a range exceeding 1000 μs / cm, which results in a scale amount of about 200 g or more precipitated during 15 days of operation. At this time, it is necessary to supply a current of about 50 to 70% of the maximum current value so that the scale operation can be smooth. That is, when the maximum supplyable current is 20 A, it is preferable to supply a current of about 10 to 14 A.

The control of the amount of current can be controlled by the rectifier 610.

In another embodiment, the rotational speed (RPM) of the pump 900 can be controlled from the measured electrical conductivity value. That is, since it is determined that the scale component is larger as the electric conductivity increases, the amount of cooling water supplied to the first electrolytic unit 100 and the second electrolytic unit 200 may be increased to activate the precipitation operation. Conversely, when the electrical conductivity is low, it is judged that the scale component is small, so that the power consumption can be minimized by reducing the cooling water supply.

When the electric conductivity is within the above-mentioned basic setting range, it is preferable that the RPM of the pump 900 operates at an RPM of about 60 to 70% of the maximum RPM of the pump.

For example, when the maximum operating RPM of the pump 900 is 1750 rpm, it can operate at about 1050 to 1225 rpm when the electric conductivity is within the default setting range.

Next, if the electrical conductivity is below the default setting range, for example, if the electrical conductivity is less than 300 μs / cm, then the RPM can be operated at less than 30% of the maximum RPM. That is, when the maximum operation RPM is 1750 rpm, the pump can be operated at 525 rpm or less.

Next, when the electric conductivity exceeds the basic setting range, for example, when the electric conductivity exceeds 1000 μs / cm, it is preferable to operate at an RPM of 90% or more of the maximum RPM. That is, if the maximum operating RPM is 1750 rpm, the pump can be operated at 1575 rpm or more.

The RPM control of this pump may be provided with an inverter 620 in the motor of the pump 900 to control the speed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims, as well as the appended claims.

100: a first electrolysis unit
110: electrode plate 120: air vent
200: second electrolysis unit 210: electrode plate
300: cooling water inflow part
400: Hopper
500: Filters
600: Power supply
610: Rectifier 620: Inverter
700:
800: Electrical conductivity sensor
900: Pump

Claims (5)

A first electrolytic unit forming a cylindrical housing shape and forming an electrode on an inner surface thereof;
A second electrolytic unit forming a closed bottom shape and inserted into the first electrolytic unit and forming an electrode on an outer surface of the first electrolytic unit and having an opposite polarity to the first electrolytic unit;
A cooling water inflow part communicating with the upper part of the first electrolytic part in a tangential direction and having a pump to introduce cooling water between the first electrolytic part and the second electrolytic part to form a vortex;
A hopper which has an inverted conical shape and communicates with a lower portion of the first electrolytic unit to collect and discharge the cooling water descending from the first electrolytic unit;
A filtering unit provided under the hopper for filtering a scale included in the cooling water;
A power supply unit for supplying a current to the first electrolysis unit and the second electrolysis unit;
An electric conductivity sensor installed on the cooling water inflow part and measuring electric conductivity of the cooling water; And
And a control unit for controlling the electrodes of the first electrolysis unit and the second electrolysis unit so as to switch the current supplied from the power supply unit according to a measured value range and receiving measured values from the electric conductivity sensor, Lt; / RTI >
Wherein the control unit supplies a current of 25 to 40% of a maximum allowable current in the power supply unit when the measured value of the electric conductivity measured by the electric conductivity sensor is within a set range, Wherein the controller controls the power supply unit to supply a current of 50 to 70% of the maximum allowable current when the electric conductivity value exceeds the set range, Removal device. delete A first electrolytic unit forming a cylindrical housing shape and forming an electrode on an inner surface thereof;
A second electrolytic unit forming a closed bottom shape and inserted into the first electrolytic unit and forming an electrode on an outer surface of the first electrolytic unit and having an opposite polarity to the first electrolytic unit;
A cooling water inflow part communicating with the upper part of the first electrolytic part in a tangential direction and having a pump to introduce cooling water between the first electrolytic part and the second electrolytic part to form a vortex;
A hopper which has an inverted conical shape and communicates with a lower portion of the first electrolytic unit to collect and discharge the cooling water descending from the first electrolytic unit;
A filtering unit provided under the hopper for filtering a scale included in the cooling water;
A power supply unit for supplying a current to the first electrolysis unit and the second electrolysis unit;
An electric conductivity sensor installed on the cooling water inflow part and measuring electric conductivity of the cooling water; And
And a control unit for controlling the electrodes of the first electrolysis unit and the second electrolysis unit so as to switch a flow rate by controlling the RPM of the pump according to a measured value range and receiving measured values from the electric conductivity sensor However,
Wherein the controller operates the RPM of the pump at a RPM of 60 to 70% of the maximum RPM when the electric conductivity measured by the electric conductivity sensor is within the set range, and when the electric conductivity value is less than the set range, Wherein the RPM is operated at a RPM of 30% or less of the maximum operation RPM, and when the electric conductivity value exceeds the set range, the RPM of the pump is controlled to operate at 90% or more of the RPM of the maximum operation RPM. Automatic removal device. delete 4. The method according to any one of claims 1 to 3,
Wherein an upper portion of the first electrolytic unit is provided with an air vent for discharging gas generated in the first electrolytic unit.

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