KR100958953B1 - dehydrator having drum cooling system - Google Patents

Abstract

Electro-osmotic dehydrator having a drum cooling device according to the present invention is a drum having at least one electrode terminal on the outer peripheral surface, and is installed on the outer peripheral surface of the drum to be in close contact with the outer peripheral surface of the drum to dehydrate the sludge at least one electrode terminal Eggplant is provided with a caterpillar, the drum is provided with a drum cooling means for cooling the outer peripheral surface of the drum.

Such a drum cooling device can prevent the sludge from adhering to the outer circumferential surface of the drum by the heat generated from the drum.

Sludge, dewatering, electropenetration, drum, cooling.

Description

Dehydrator having drum cooling system

The present invention relates to an electroosmotic dehydrator, and more particularly to a drum cooling apparatus of an electroosmotic dehydrator for cooling a drum to which a predetermined current is applied.

In general, sludge (sludge) generated in wastewater and sewage treatment plants uses a polymer flocculant to purify water, and the sludge agglomerated 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 electropenetrating dewatering device removes the sludge-associated water by ion mobility. That is, a DC power source having a positive (+) polarity or a DC power source having a negative (-) polarity is applied to the rotating drum and the caterpillar of the dehydrator, respectively, but the polarities of the DC power applied to the rotating drum and the caterpillar are respectively different. When applied oppositely, dehydration is caused by electrical induction between the rotating drum in the area where the sludge passes and the space between the caterpillar and the object with the positive and negative polarity of the DC power supply. Is activated.

An example of such an electropenetrating sludge dewatering apparatus is disclosed in Japanese Patent Laid-Open No. 56-60604 and Domestic Patent Application 1993-0010856.

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. By this separation, dewatering from the sludge occurs.

On the other hand, the Applicant rectifies the three-phase alternating current for each phase (R, S, T) so as not to cause a voltage drop, and converts the voltage into DC voltage pulses, and then applies a sequential voltage due to a phase difference to the electrode to dehydrate the voltage. It has been filed in the Republic of Korea Patent Application No. 2003-39471, which is an electric penetration type dehydration device that prevents loss and maintains a constant voltage at all times to increase dehydration performance.

And Patent No. 0457628 discloses an example of an electropenetrating dehydrator. In the disclosed dehydrator, a cathode is applied to a drum, and a cathode is applied to a caterpillar wound on a cylindrical surface of the drum, and a technical configuration in which a plurality of electrodes are installed on the caterpillar is disclosed.

In such an electroosmotic dehydration device, since a predetermined voltage is applied to the drum and the caterpillar, relatively high heat is generated. The generation of this heat is a problem that the sludge is fixed to the drum and the caterpillar. Securing the sludge to the drum and the caterpillar has a problem that the potential application efficiency is relatively low and the dewatering efficiency cannot be improved.

The present invention is to solve the problems as described above, the drum cooling apparatus that can prevent the sludge adhered to the surface of the drum by the heat generated from the drum, and further improve the dewatering efficiency of the sludge The purpose is to provide an electro-permeable dehydrator having a.

Electric permeation dehydrator having a drum cooling device of the present invention for achieving the above object is provided with a drum having at least one electrode on the outer circumferential surface, and a caterpillar having at least one electrode terminal to be in close contact with the outer circumferential surface of the drum to depressurize the sludge. The drum is characterized in that it is provided with a drum cooling means for cooling the outer peripheral surface of the drum.

According to the present invention, a chamber is formed in which a heat exchange medium is injected into the drum, and a heat exchange medium supply unit for supplying cooling water to the chamber, and a heat exchange medium discharge unit for discharging the heat exchange medium inside the chamber.

The drum cooling means may include a heat exchanger tube installed on an inner circumferential surface of the drum installed along an inner circumferential surface of the drum, a first rotary joint installed on one side of the rotating shaft of the drum and connected to one side of the one exchange tube, It is provided on the other side has a second rotary joint connected to the other side of the heat exchange tube.

The drum cooling means includes a heat pipe having a heat receiving portion fixed to an inner circumferential surface of the drum and a heat dissipating portion positioned between electrodes on an outer circumferential surface of the drum.

The electrofiltration dehydrator having the drum cooling device according to the present invention can fundamentally prevent the sludge from adhering to the surface of the drum by the heat generated from the drum by cooling the drum to which a predetermined potential is applied, and furthermore, the drum and the caterpillar. By maximizing the dewatering efficiency of the sludge.

The electro-osmotic dehydrator according to the present invention is to prevent the sludge from adhering to the outer circumferential surface of the drum by cooling the drum and the caterpillar to which the potential is applied, and one embodiment thereof is shown in FIGS.

Referring to the drawings, the electro-osmotic dehydrator is a frame 11 and the electro-osmotic dehydration means 20 installed on the frame 11 by relaying or inducing current through sludge dewatered primarily by the pressurization and gravity dehydration unit. It is provided.

The electric penetration dewatering means 20 is installed in the frame 11 and the drum 30 is formed with a plurality of electrodes 31 on the outer circumferential surface to relay or induce three-phase alternating current, and both sides of the drum 30 and A plurality of support rollers 41-44 installed at the lower portion thereof, and a caterpillar caught by the support rollers 41-44 and in contact with a portion of an outer circumferential surface of the drum 30 on which the electrode 31 is installed (see FIG. 1). 40, a power applying means (not shown) for supplying power to the drum 30 and the caterpillar 40, and a drum cooling means installed in the drum 30 to cool the drum 30 ( 60).

Here, the drum 30 has a pressing belt 100 for transferring the sludge firstly dehydrated by gravity or pressure between the drum 30 and the caterpillar 40. The pressing belt 100 is caught by the drum 30 to insulate the caterpillar 40 and the drum 30. That is, as shown in FIGS. 1 and 2, the pressure belt 100 and the caterpillar 40 are caught by the drum 30 in an overlapped state. Therefore, the sludge for dewatering is introduced between the pressing belt 100 and the drum caught by the pressing belt 100 to be dehydrated by being in close contact with the caterpillar 40. In this case, the pressing belt 100 does not necessarily need to be interposed between the drum 30 and the caterpillar 40. The drum 30 may be insulated from each other on the outer circumferential surface and divided electrodes spaced apart from each other by a predetermined interval.

On the other hand, the drum cooling means 60 is for cooling the drum 30 is heated when the power is applied to drive, an embodiment is shown in Figures 1 to 3.

Referring to the drawings, the drum cooling means 60 is formed with a chamber 61 into which a heat exchange medium 200 for cooling is injected into the entire interior of the drum 30, and the chambers are provided at both sides of the drum 30. The heat exchange medium supply part 62 for supplying the heat exchange medium and the heat exchange medium discharge part 65 for discharging the heat exchange medium 200 from the chamber 61 are formed inside 61.

The chamber 61 formed on the drum 30 is formed by sealing an inner space of the drum 30 supported by the rotating shaft 32, and the inner space is rotated about the rotating shaft of the drum 30. It is formed in a symmetrical space around the axis of rotation so as not to be affected by the.

The heat exchange medium supply part 62 has a first passage 63 which communicates with the inside of the chamber 61 from the outer circumferential surface of the rotation shaft 32 of the drum 30 and is rotatably formed on the rotation shaft 32. It is provided with a first rotary joint 64 for supplying water to the inlet side of the first passage (63). The first rotary joint 64 has a first groove 64a connected to the first passage 63 in the circumferential direction on an outer circumferential surface of the rotation shaft 32, and the first groove 64a is audited. The first housing 64b rotatably installed on the rotating shaft 32 and the housing 64b are coupled to the heat exchange medium in the chamber 61 through the first groove 64a and the first passage 63. Supplying The heat exchange medium supply pipe 64c and the heat exchange medium supply pipe 64c are provided with a pump 64d for pumping the heat exchange medium in the storage tank. When the heat exchange medium is made of water, the heat exchange medium supply pipe 64c may be directly connected to a raw water supply pipe (eg, a water pipe).

On the other hand, the heat exchange medium discharge portion 65 is provided at the end of the rotary shaft 32 on the other side corresponding to the heat exchange medium supply portion, the configuration is substantially the same as the heat exchange medium supply portion 62. That is, the heat exchange medium discharge part is formed with a second passage 66 communicating with the inside of the chamber 61 from the other outer peripheral surface of the rotary shaft 32 of the drum 30, so as to be rotatable on the rotary shaft 32 And a second rotary joint 67 for discharging the heat exchange medium in the outlet side of the second passage 66 and the chamber 61. The second rotary joint 67 has a second groove 67a connected to the second passage 66 in the circumferential direction on the outer circumferential surface of the rotation shaft 32, and surrounds the second groove 67a. A second housing (67b) rotatably installed on the rotating shaft 32, and coupled to the housing (67b) for supplying heat exchange medium to the chamber through the second groove (67a) and the second passage (66) The heat exchange medium discharge pipe 67c is provided.

The drum cooling means configured as described above supplies the heat exchange medium 200 into the chamber 61 through the first rotary joint 64 of the heat exchange medium supply part 62. As described above, when the level of the heat exchange medium 200 supplied into the chamber 61 becomes the center of the chamber 61, that is, the level above the rotation shaft 32, the second passage 66 installed on the rotation shaft 32 and It discharges through the 2nd rotary joint 67 and the heat exchange medium discharge pipe 67c. Here, the heat exchange medium supplied to the chamber 61 is circulated by discharging not more than half of the chamber 61, that is, not more than the rotation axis portion.

4 and 5 show another embodiment of the drum cooling means according to the present invention. The same reference numerals as the above embodiment indicate the same components.

Referring to the drawings, the drum cooling means 70 is provided with a heat exchanger tube 71 installed in a meandering shape along the inner circumferential surface of the drum 30, one side of the heat exchanger tube 71 is installed on one side of the rotating shaft It is connected with the first passage 63 of the heat exchange medium supply part 62. Therefore, the heat exchange medium supplied through the heat exchange medium supply pipe 64c of the first rotary joint 64 can be supplied to the heat exchange pipe. The other end of the heat exchange tube 71 is connected to the second passage 66 of the heat exchange medium discharge unit 67 formed at the other end of the rotation shaft 32.

The heat exchange tube 71 may be arranged in a meandering shape on the inner circumferential surface of the drum 30 or a meandering water jacket may be formed in the drum.

In order to cool the drum 30 using the drum cooling device 70 configured as described above, water is supplied to the first passage 63 using the first rotary joint 64 of the heat exchange medium supply part 62. The water thus supplied is discharged through the heat exchange tube 71, the second passage 66, and the second rotary joint 67. In this process, water flowing through the heat exchange tube 71 installed on the inner circumferential surface of the drum 30, that is, heat exchange with the heat exchange medium, is used to cool the drum 30. Therefore, it is possible to prevent the drum 30 from overheating due to the application of voltage.

6 and 7 show another embodiment of the drum cooling apparatus according to the present invention. Referring to the drawing. It is provided on the outer circumferential surface of the drum 30 is provided with a heat pipe 80 for transferring heat between the drum 30 and the pressure belt using the sludge to release the heat of the drum. The heat receiving portion 81 contacts the inner circumferential surface of the drum 30, and the heat generating portion is positioned between the electrodes 31 provided on the outer circumferential surface of the drum 30. The heat pipe 80 is configured such that air bubbles of 80% to 90% of the internal space are supplied to contain bubbles.

The drum cooling apparatus using the heat pipe 80 may heat exchange between the sludge and the drum moved by the pressure belt to cool the drum 30. That is, when heat is received from the heat receiving portion installed on the inner circumferential surface of the drum 30, the heat fluid and the gas therein are adiabaticly expanded and the heat fluid moves to the heat dissipation portion, and the heat is radiated from the heat dissipation portion and shrinks. do. Through this process, heat is released from the heat receiving portion and the heat radiating portion.

On the other hand, the cooling means is not limited to the above-described embodiment and may be any structure as long as it is capable of cooling the drum during operation that can cool the drum.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention.

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

The gravity pressurized electric permeation dehydrator according to the present invention configured as described above is used for manufacturing various kinds of industrial wastes, coal mined from mines, food waste or dehydration, including sludge dewatering in sewage treatment plants and sludge dewatering in wastewater treatment plants. There is an advantage to apply.

1 is a perspective view schematically showing an electropenetrating dehydrator according to the present invention;

2 is a cross-sectional view of a drum in which a drum cooling device is installed in the present invention;

3 is a cross-sectional view of the drum,

4 is a cross-sectional view of a drum showing another embodiment of the drum chiller,

5 is a cross-sectional view of the drum,

6 is a perspective view showing an extract of the drum cooling device,

7 is a cross-sectional view showing the drum body.

Claims (3)

A drum having at least one electrode terminal on an outer circumferential surface thereof, and a caterpillar installed on the outer circumferential surface of the drum to contact the outer circumferential surface of the drum to pressurize and dewater the sludge, and having at least one electrode terminal, wherein the drum cools the outer circumferential surface of the drum. It is provided with a drum cooling means for The drum cooling means comprises a chamber in which a heat exchange medium for cooling is injected, and a heat exchange medium supply part for supplying a heat exchange medium into the chamber on both sides of the drum; A heat exchange medium discharge part for discharging the heat exchange medium, The heat exchange medium supply unit is formed with a first passage communicating with the drum from the rotating shaft of the drum, rotatably installed on the rotating shaft has a first rotary joint for supplying water to the inlet side of the first passage; , The heat exchange medium discharge part is installed at an end portion of the rotary shaft on the other side corresponding to the heat exchange medium supply part, and a second passage communicating with the inside of the chamber from the other side of the rotary shaft of the drum is formed, and is rotatably installed on the rotary shaft. And a second rotary joint for discharging the heat exchange medium in the chamber and the outlet side of the second passage. delete A drum having at least one electrode terminal on an outer circumferential surface thereof, and a caterpillar installed on the outer circumferential surface of the drum to contact the outer circumferential surface of the drum to pressurize and dewater the sludge, and having at least one electrode terminal. It is provided with a drum cooling means for cooling, The drum cooling means includes a heat exchanger tube installed on an inner circumferential surface of the drum installed along the inner circumferential surface of the drum, a first rotary joint installed on one side of the drum and connected to one side of the heat exchanger tube, and the other side of the rotary shaft. And a second rotary joint mounted to the other side of the heat exchange tube and connected to the other side of the heat exchanger tube.

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