KR101665973B1 - Apparatus for drying sludges - Google Patents

Apparatus for drying sludges Download PDF

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Publication number
KR101665973B1
KR101665973B1 KR1020160025479A KR20160025479A KR101665973B1 KR 101665973 B1 KR101665973 B1 KR 101665973B1 KR 1020160025479 A KR1020160025479 A KR 1020160025479A KR 20160025479 A KR20160025479 A KR 20160025479A KR 101665973 B1 KR101665973 B1 KR 101665973B1
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South Korea
Prior art keywords
conveyor belt
sludge
air
horizontal conveying
housing
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Application number
KR1020160025479A
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Korean (ko)
Inventor
이상준
Original Assignee
주식회사 화인
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Priority to KR1020160025479A priority Critical patent/KR101665973B1/en
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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
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/123—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using belt or band filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/04—Agitating, stirring, or scraping devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/18—Sludges, e.g. sewage, waste, industrial processes, cooling towers

Abstract

The drying apparatus of the present invention comprises: a housing having a sludge inlet and an air outlet formed at an upper end thereof and a sludge outlet and an air inlet formed at a lower end thereof; A blower disposed in the housing to allow air to flow from the air inlet to the air outlet; And a first conveyor belt and a second conveyor belt, wherein the first and second conveyor belts are configured such that sludge flowing from the sludge inlet is loaded and discharged to the sludge outlet and discharged from the air, Each having a plurality of horizontal transport sections extending horizontally perpendicular to the flow of air and arranged in parallel to one another in multiple stages from the top of the housing to the bottom.

Description

[0001] APPARATUS FOR DRYING SLUDGES [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge drying apparatus, and more particularly, to an apparatus for drying sludge such as wastewater and the like to reduce moisture content.

In the process of treating wastewater and wastewater, the sludge mixed with the solid phase and the liquid phase remains after the sedimentation process for separating the solid matter contained in the wastewater. These sludges have been buried in soil or treated by dumping them in the ocean. However, in recent years, pollution of the oceans and soil has become a problem, and landfilling of sludge or marine dumping is gradually being prohibited.

Therefore, the sludge must be incinerated or reformed to be composted. However, the incineration of the sludge containing a large amount of water consumes a considerable amount of fuel, and even when the reforming treatment is performed, a considerable amount of modifying agent is administered. It is necessary to minimize the amount of water contained in the sludge before the incineration or the reforming treatment in order to lower the cost by increasing the efficiency of composting by the sludge.

In order to reduce the moisture content of the sludge, the sludge produced in the precipitation process is dewatered to concentrate the sludge. However, since the concentrated sludge after dewatering also has a high water content for the purpose of incineration or reforming for composting, Modifiers are consumed.

By drying the concentrated sludge through dehydration treatment, the water content can be drastically reduced to lower the cost of incineration of the sludge or the cost of the reforming treatment for composting, as well as to lower the transportation cost by reducing the weight of the sludge.

Drying of such sludge has been proposed or proposed for drying by hot air, direct heating by a heater, drying by a microwave, and drying by contact with a high-temperature hot plate.

Hot air drying uses an infrared heater or the like as a heat source, heating the air, and passing the heated air through the sludge. In the hot air drying method, since the sludge is not heated directly, there is no danger of fire due to local heating, and there is no danger of fire, and the hot, high temperature air flows into the sludge and the moisture of the sludge is quickly transferred to the air.

A technique of using microwave drying and heating by a heater is disclosed in Patent Document 1033678 (Document 1).

The sludge rapid drying apparatus of Document 1 discloses an apparatus for drying sludge by a microwave and a heating lamp. The drying apparatus of Document 1 includes a chamber having an inlet hopper and an outlet hopper into which sludge flows, A plurality of magnetrons provided on both side walls of the multiaxial screw chamber and spaced apart from each other in the direction of transfer of the sludge, and a plurality of magnetrons disposed in the chamber across the conveying direction of the sludge between the plurality of magnetrons And a heating lamp.

In the rapid drier of Document 1, as the sludge is conveyed by the screw in the chamber, the inside of the sludge is heated by the microwave from the magnetron, and the outside of the sludge is heated by the heat from the heating lamp to dry the sludge.

Japanese Laid-Open Patent Application No. 1574596 (Document 2) discloses a drying device for heating and drying sludge by a hot plate. In the drying device of Document 2, an electric plate for heating sludge is arranged vertically, And the sludge is dropped by the lower drying plate. The sludge is conveyed in the electric plate by the screw, and is heated and dried.

Such conventional drying apparatuses use a direct heating method using hot air, microwaves, a heating plate, a heating lamp or the like as means for heating the sludge. Any heating means generates heat that can evaporate moisture from the sludge, Is common in that it transfers heat to the sludge, that is, it provides the heat of evaporation necessary for the water to evaporate in the sludge.

Therefore, such a drying apparatus of the prior art tries to reduce the consumption of energy and resources required for the incineration or modification treatment of the concentrated sludge by drying the precipitated and dehydrated sludge, but rather consumes a considerable amount of energy for drying the sludge, It is impossible to expect an improvement in the efficiency of energy use in sludge treatment or an effect of improving the efficiency by drying is insignificant.

Document 1: Registration Patent No. 1033678 Document 2: Registered Patent Publication No. 1574596

In consideration of the problems of the above-described conventional sludge drying apparatus, the present invention provides a sludge drying apparatus that uses a small amount of energy for drying concentrated sludge after sedimentation and dehydration, but also has a low moisture content suitable for incineration or reforming treatment And to provide a drying device that can provide the desired results.

In connection with this problem, the inventors of the present invention have considered using the principle of natural drying in the drying of the slurry.

Moisture drying is optimal for low humidity, high temperature, and sufficient air movement. The prior art only contemplates only increasing the temperature of the sludge by means of a microwave or a heating lamp considering only the condition of 'high temperature' among these three conditions.

The inventor of the present invention has considered a construction in which the sludge is dried by applying sufficient air flow around the sludge as in natural drying without applying high temperature heat to the sludge.

However, drying of the slurry under natural drying conditions can take a considerable time and requires a very large area of drying equipment which can spread the sludge widely to increase the contact area between the sludge and the air.

Therefore, the inventor of the present invention intends to provide a drying apparatus capable of providing a sufficient air flow to the sludge, while allowing the sludge to contact with air in a large area with a small occupied space.

The above-described object of the present invention is achieved by a drying apparatus for sludge according to the present invention,

A housing having a sludge inlet and an air outlet formed at an upper end thereof and a sludge outlet and an air inlet formed at a lower end thereof; A blower disposed in the housing to allow air to flow from the air inlet to the air outlet; And first and second conveyor belts configured such that the sludge introduced from the sludge inlet is loaded and discharged to the sludge outlet and is formed of a material through which air is permeated,

The first conveyor belt and the second conveyor belt each have a plurality of horizontal conveyance sections extending horizontally perpendicularly to the flow of air and arranged in parallel to each other in multiple stages from the top to the bottom of the housing,

The horizontal conveyance section of the first conveyor belt and the horizontal conveyance section of the second conveyor belt are alternately arranged so that the sludge falling at the end of one horizontal conveyance section of the first conveyor belt is conveyed to the horizontal conveyance section And the sludge falling at the end of one horizontal conveying section of the second conveyor belt is conveyed in the horizontal conveying section of the first conveyor belt under the first conveying belt, Conveyed in a horizontal conveying section of the conveyor belt,

The sludge is introduced from the sludge inlet into the uppermost horizontal conveying section of the horizontal conveying section of the first conveyor belt and the second conveyor belt, falls to the sludge outlet at the end of the lowermost conveying section, And dried by air passing through the first conveyor belt and the second conveyor belt during conveyance on the conveyor belt.

In the sludge drying apparatus of the present invention, air flows in from the air inlet at the lower end to the air outlet at the upper end, thereby forming a vertical air flow from the lower end to the upper end of the housing.

In the housing, two conveyor belts carry the slurry, and the conveyor belts are made of air-permeable material having a horizontal horizontal conveying section orthogonal to the vertical air flow, so that the conveyor belts are conveyed on a conveyor belt The sludge is dried by the air flowing upward from the lower side of the conveyor belt.

The horizontal conveying sections of the conveyor belt are arranged such that the horizontal conveying section of the first conveyor belt and the horizontal conveying section of the second conveyor belt are alternately stacked so that the sludge conveyed in one horizontal conveying section falls down And the drying is carried out while being loaded on the horizontal conveying sections in a sequential manner so as to be conveyed to other horizontal conveying sections arranged in the horizontal conveying sections.

Accordingly, in the drying apparatus of the present invention, the sludge can be dried while being moved along a long path including horizontal conveying sections of the conveyor belt while being exposed to the flow of air, and the drying apparatus forms a long path for drying the sludge It is configured to occupy only a narrow area.

delete

The first conveyor belt and the second conveyor belt are wound around a plurality of large-diameter pulleys and large-diameter pulleys disposed in the upper and lower positions, respectively, and a plurality of small- Diameter pulley and a small-diameter pulley so as to form the horizontal conveying section at a portion which is advanced from the large-diameter pulley to the small-diameter pulley,

The small diameter pulleys of the first conveyor belt are each horizontally adjacent to the large diameter pulley of the second conveyor belt and the small diameter pulleys of the second conveyor belt are each horizontally adjacent to the large diameter pulley of the first conveyor belt So that the horizontal conveying sections of the first conveyor belt and the second conveyor belt are arranged alternately up and down.

According to this configuration, two conveyor belts are arranged in one drying apparatus, but these conveyor belts are arranged in parallel with each other and are arranged to cross each other in the same space without occupying each space, It is transferred sequentially in the receiving mode.

Thus, the drying apparatus occupies a small area and a small space, and can form a long conveyance path for drying the sludge.

As one embodiment of the present invention, in the drying apparatus of the present invention, at least one horizontal conveying section of the horizontal conveying sections of the first conveyor belt and the second conveyor belt is conveyed to the first conveyor belt or the second conveyor belt, A stirrer can be installed.

The agitator includes a panel disposed in a direction perpendicular to the moving direction of the first conveyor belt or the second conveyor belt, and a panel extending and protruding in a direction perpendicular to the longitudinal direction of the panel and being loaded on the first conveyor belt or the second conveyor belt, And a plurality of projections contacting the sludge.

According to the structure of the agitator, the sludge conveyed by the conveyor belt collides with the projections of the agitator during transportation, and the agglomerated sludge is crushed or mixed with each other to promote the movement of water in the sludge, The drying of the sludge is promoted.

1 is a front view showing the overall structure of a drying apparatus for a sludge according to an embodiment of the present invention.
2 is a longitudinal sectional view showing the arrangement of a conveyor belt in a drying apparatus of one embodiment of the present invention.
3 is a plan view showing the arrangement of the agitator in the drying apparatus of one embodiment of the present invention.
4 is a cross-sectional view showing the arrangement of the electromagnetic wave generator in the drying apparatus of one embodiment of the present invention.
5 is a plan view and a longitudinal sectional view showing a pulverizer of a sludge in a drying apparatus of one embodiment of the present invention.

Hereinafter, the construction and operation of a drying apparatus for sludge according to one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a view showing the overall structure of the drying apparatus of the present embodiment. In FIG. 1, a part of the housing 10 is removed to reveal a structure inside the housing, and a part of the structure is indicated by a dotted line, Respectively.

1, a drying device 1 according to the present embodiment is arranged. On the left side, a sludge dewatered by a sludge dewatering device (not shown) is supplied to a drying device 1 .

The upper end of the screw conveyor 10 is supported on the upper end of the housing 20 of the drying apparatus 1 of the present embodiment and the lower end of the screw conveyor 10 is supported on the lower sludge inlet 12 When the sludge is charged, a screw (14) rotated by the upper motor (13) transfers the sludge to the upper side to inject sludge into the sludge inlet (21) of the drying device (1).

The drying apparatus 1 of the present embodiment has a rectangular parallelepiped-shaped housing 20 as a whole, and the housing 20 is installed on the ground and the lower end is spaced from the ground.

A sludge inlet 21 is formed at one side of the upper end of the housing 20 so that the sludge transferred by the sludge feeder 10 is introduced into the drying device 1, A crusher 30 for finely crushing sludge is provided.

5 (a) is a cross-sectional view of a crusher 30 for crushing sludge, and FIG. 5 (b) is a longitudinal sectional view, in which a driving motor and the like are omitted.

The crusher 30 has two rotary shafts 31 arranged in parallel to each other and the rotary shaft 31 is provided with a crushing blade 32 extending along the longitudinal direction of the rotary shaft 31, (32) are engaged with each other. According to this configuration, the sludge injected from the upper side of the crusher is finely crushed by the crushing blade 32 and dropped onto the first conveyor belt 40 of the drying device.

The sludge to be discharged is loaded on the first conveyor belt 40 and the second conveyor belt 50 and is conveyed and dried to be discharged to the lower end of the drying apparatus 1. Referring to FIG. 2, the first conveyor belt 40 The construction and arrangement of the second conveyor belt 50 will be described.

In FIG. 2, for the sake of convenience of illustration and explanation, some of the constituent elements necessary for driving the conveyor belts 40 and 50 are omitted, and the omitted constitution will be described with reference to FIG.

The drying apparatus 1 of this embodiment transports the sludge from the inlet 21 to the outlet 22 at the lower end of the housing 20 by means of the two conveyor belts of the first conveyor belt 40 and the second conveyor belt 50 do.

Since the first conveyor belt 40 and the second conveyor belt 50 are symmetrical to each other, the structure of the first conveyor belt 40 will be described in detail.

The first conveyor belt 40 includes a guide roller 45, a plurality of large diameter rollers 41 and a drive roller 46 which are vertically disposed in the left side in Fig. 2, and a plurality of small diameter rollers A filter cloth 43 which is supported by the rollers 41 and 42 in the form of an endless track and a belt weaving apparatus 44 which prevents the filter cloth 43 from being detached from the track.

The filter fabric 43 has a large diameter guide roller 44 disposed on the upper left side of the housing 20 and horizontally extended to a small diameter roller 42 disposed on the upper right side of the guide roller 44 in opposition to the guide roller 44 Diameter rollers 41 and the small-diameter rollers 42 facing the large-diameter rollers 41. The small-diameter rollers 42 are reversed in direction and extend horizontally again to the large-diameter rollers 41 below the guide rollers 44, ).

In this way, the filter cloth 43 is repeatedly started from the large-diameter guide rollers 44 to the bottom of the housing alternately wound on the small-diameter rollers 42 and the large-diameter rollers 41, Diameter roller 42 and extends to the opposite driving roller 46 and extends from the driving roller 46 to the upper guide roller 45 via the belt weaving device 44. [

2, the filter cloth 43 constituting the first conveyor belt rotates in a clockwise direction as a whole. When the lower drive roller 46 is rotated by a drive motor (47 in FIG. 1) Diameter roller 41 and the small-diameter roller 42 while alternately passing the small-diameter rollers 42 and the large-diameter rollers 41 from the roller 44 and moving to the right in FIG. 2 At the point where the small diameter roller 42 faces the large diameter roller 41, the conveying direction is reversed to move leftward and the upper and lower surfaces are reversed with each other. Finally, the guide rollers 45).

The second conveyor belt 50 is configured and operated in the same manner as the first conveyor belt 40, but formed symmetrically to the first conveyor belt 40 in FIG.

2, the small diameter rollers 52 are disposed on the left side of the housing and the guide rollers 55, the plurality of large diameter rollers 51, the driving rollers 54, And the filter cloth 53 rotates counterclockwise as a whole and the direction of movement is reversed only when the small-diameter roller 52 faces the large-diameter roller 51 and the driving roller 56.

On the other hand, the small diameter pulleys 42 of the first conveyor belt are each disposed horizontally adjacent to the large diameter pulley 51 of the second conveyor belt, and similarly the small diameter pulleys 52 of the second conveyor belt Diameter pulley 41 of the first conveyor belt, respectively.

The point at which the filter cloths 43 and 53 move horizontally from the large diameter pulleys 41 and 51 to the small diameter pulleys 42 and 52 in the first conveyor belt 40 and the second conveyor belt 50, Thereby forming a horizontal conveying section for the horizontal conveying section.

The horizontal conveying sections of the first conveyor belt 40 and the horizontal conveying sections of the second conveyor belt 50 are alternately arranged in the vertical direction such that the horizontal conveying sections of the first conveyor belt 40, The sludge conveyed by the conveyor belt 43 is conveyed to the conveyor belt 43 by the horizontal movement of the second conveyor belt 50 disposed below the horizontal conveying section of the first conveyor belt 40, When the filter cloth 53 passes over the small diameter roller 52 of the second conveyor belt 50, the upper and lower surfaces of the filter cloth 53 are reversed And falls on the filter cloth 43 of the first conveyor belt disposed below the filter cloth 43.

In addition, the horizontal transfer sections of the first and second conveyor belts 40 and 50 are provided with an agitator 60 for agitating sludge to be transferred.

3, the agitator 60 includes a panel 61 disposed in a direction perpendicular to the moving direction of the filter cloths 43 and 53 and fixed to the housing, and a conveying direction A A plurality of protrusions 62 protruding in the opposite direction are extended and protruded. The projections 62 are stacked on the filter cloths 43 and 53 of the conveyor belts to collide with the conveyed sludge so that the agglomerated sludge is scattered or overturned.

Particularly, the projections 62 of the single stirrer 60 and the projections 62 of the stirrer 60 disposed adjacent thereto are staggered from each other, so that the sludge can be evenly stirred.

As shown in FIG. 2, in the present embodiment, two agitators 60 are provided in a part of the horizontal conveying sections. However, the agitator 60 may be provided with one or more .

Referring again to Figure 1, Figure 1 shows the entire arrangement for driving the first conveyor belt 40 and the second conveyor belt 50.

A drive motor 47 for driving the first conveyor belt 40 is mounted on the outer wall at the lower left end of the housing 20 and the drive motor 47 and the drive roller 46 are connected by a chain So that the rotational force of the drive motor 47 is transmitted to the drive roller 46. [ The drive motor 57 of the second conveyor belt 50 is arranged on the opposite side of the drive motor 47 of the first conveyor belt 40.

Above the belt weaving apparatus 44, 54, a belt skew detection sensor 48, 58 for sensing that the filter cloths 43, 53 are separated from the wall surface of the housing 20 in the width direction with respect to the rollers) Respectively.

A belt tensioner 49 is coupled to the small-diameter roller 42 of the first conveyor belt disposed at the uppermost position in the housing 20. The belt tensioner 49 applies a predetermined tension to the filter cloth 43 of the first conveyor belt 40 by applying a pulling force to the small diameter roller 42 in the direction away from the guide roller 45 facing the small diameter roller 42, .

Similarly, the belt tensioner 59 is also engaged with the small-diameter roller 52 of the second conveyor belt disposed at the lowermost position in the housing to apply a predetermined tension to the filter cloth 53 of the second conveyor belt.

Since the drive motors 47 and 57, the belt skewers 44 and 54, the belt skew detection sensors 48 and 58 and the belt tensioners 49 and 59 can be widely known and widely used, The description is omitted.

The sludge introduced into the sludge inlet 21 at the upper end of the housing by the screw conveyor 10 is finely pulverized by the pulverizer 30 and is conveyed through the filter conveyor in the uppermost horizontal conveying section of the first conveyor belt 40 43).

The loaded sludge is conveyed while passing between the horizontal conveying sections of the filter cloths 43 and 53 of the first and second conveyor belts 40 and 50 while the filter cloth 43 of the first conveyor belt 40 is conveyed to the lowermost section And falls into the sludge outlet 22 disposed at the lower portion thereof when being inverted by the diameter roller 42, and is discharged to the outside of the drying apparatus.

At the lower end of the housing 20, three air inlets 23 are provided along the extending direction of the filter cloths 43 and 53 of the first and second conveyor belts 40 and 50, and an air inlet 23 Three air outlets 24 are provided. A blower 70 is disposed above each air outlet 24 to discharge the air inside the housing 20 through the air outlet 24 to the outside.

According to this configuration, the air introduced from each air inlet 23 and discharged to the upper air outlet 24 forms a vertical flow in the housing 20 from the lower end to the upper end.

This vertical airflow collides with the filter cloths 43 and 53 constituting the horizontal conveying sections of the first and second conveyor belts 40 and 50 and passes through the filter cloths 43 and 53 which are permeable to air, ) And flows around the transferred sludge, thereby causing moisture contained in the sludge to evaporate from the surface.

In the present embodiment, the filter cloths 43 and 53 are formed of a spiral canvas type having an air permeability of 2000 CFM (Cubic Feet per Minute).

Referring to FIG. 1, three first electromagnetic wave generators 81 are disposed on both sides of the housing, and a second electromagnetic wave generator 82 is disposed on each of the air inlet 23 and the air outlet 24 .

The first and second electromagnetic wave generators 81 and 82 generate an electromagnetic wave having a frequency of 30 to 50 kHz belonging to a long wave region by applying an alternating current having a frequency of 20,000 V and 30 to 50 kHz.

The first electromagnetic wave generator 81 is formed to extend vertically between the air inlet 23 and the air outlet 24 so that three electromagnetic wave generators 81 are disposed on each side of the conveyor belts 40 and 50. The second electromagnetic wave generator 82 is formed in a disk shape and is disposed around the air inlet 23 and the air outlet 24, respectively.

The electromagnetic waves generated from the electromagnetic wave generators 81 and 82 are loaded on the filter cloths 43 and 53 on the first and second conveyor belts 40 and 50 and act on the moisture of the sludge to be transferred, And the movement is activated.

Moisture on the surface of the sludge is evaporated by the air flowing around the sludge conveyed by the first and second conveyor belts (40, 50), and moisture on the inside of the sludge moves to the surface as the surface sludge is dried. The movement of such moisture is promoted by the electromagnetic waves applied by the electromagnetic wave generators 81 and 82, and drying of the inside of the sludge is promoted.

On the other hand, in the present embodiment, the electromagnetic wave generated from the electromagnetic wave generator has a frequency of 30 to 50 kHz. If the frequency of the electromagnetic wave is less than 30 kHz, the activation effect of excitation and movement of moisture by electromagnetic waves is lowered, The drying is very slow. When the frequency is higher than 50 kHz, the electromagnetic wave becomes high frequency, and the heating effect of the sludge by the electromagnetic wave becomes high, and the energy consumption becomes excessive.

Also, in this embodiment, the voltage of the current for generating the electromagnetic wave is 20,000 V, and the higher the voltage, the higher the effect of exciting the moisture.

Electromagnets 90 concentric with and having the same diameter as those of the air inlet and outlet are disposed at the inside of the housing 20 at the respective air outlet 24 and air inlet 23.

The electromagnets 90 were wound into a coil having a diameter of 1.5 mm at a width of 100 mm and formed into a cylindrical shape according to the shapes of the air outlet 24 and the air inlet 23.

The electromagnets 90 are disposed in the air outlet 24 and the air inlet 23 respectively and apply an alternating current of 100 V and a frequency of 30 to 50 kHz to the electromagnets 90 so that an electric field formed by the electromagnets 90 is transmitted to the housing 20) and the sludge in the flow path of the air.

These electric fields are alternated by alternating currents, so that alternating electric fields excite the air moving in the housing and the moisture contained in the sludge and sludge. By the excitation of air, sludge and moisture, the flow of air and the movement of moisture are activated and promoted, thereby promoting the drying of the sludge.

The embodiments of the present invention have been described above, but the present invention is not limited to these embodiments, and various changes and modifications may be made within the scope of the claims.

10: screw conveyor 20: housing
30: crusher 40: first conveyor belt
50: second conveyor belt 60: stirrer
70: blower 81, 82: electromagnetic wave generator
90: Electromagnet

Claims (6)

delete A sludge drying apparatus comprising:
A housing having a sludge inlet and an air outlet formed at an upper end thereof and a sludge outlet and an air inlet formed at a lower end thereof; A blower disposed in the housing to allow air to flow from the air inlet to the air outlet; And first and second conveyor belts configured such that the sludge introduced from the sludge inlet is loaded and discharged to the sludge outlet and is formed of a material through which air is permeated,
The first conveyor belt and the second conveyor belt each have a plurality of horizontal conveying sections extending horizontally perpendicularly to the flow of air and arranged in parallel to each other in a multistage manner from the top to the bottom of the housing, Diameter pulleys and large-diameter pulleys, which are wound in a plurality of small-diameter pulleys arranged horizontally opposite to each other and arranged on top of each other, and are alternately wound on large-diameter pulleys and small-diameter pulleys, To form the horizontal transport section,
The small diameter pulleys of the first conveyor belt are each horizontally adjacent to the large diameter pulley of the second conveyor belt and the small diameter pulleys of the second conveyor belt are each horizontally adjacent to the large diameter pulley of the first conveyor belt Whereby the horizontal conveying sections of the first conveyor belt and the second conveyor belt are arranged alternately up and down,
The sludge falling at the end of one horizontal conveying belt of the first conveyor belt is carried and conveyed in the horizontal conveying section of the second conveyor belt lying below the horizontal conveying section of the first conveyor belt, The sludge falling at the end of the horizontal conveying section of the second conveyor belt is loaded and transported in the horizontal conveying section of the first conveyor belt lying below the horizontal conveying section of the second conveyor belt,
The sludge is introduced from the sludge inlet into the uppermost horizontal conveying section of the horizontal conveying section of the first conveyor belt and the second conveyor belt, falls to the sludge outlet at the end of the lowermost conveying section, And is dried by air passing through the first conveyor belt and the second conveyor belt during conveyance on the conveyor belt. The method of claim 2,
Wherein the first conveyor belt and the second conveyor belt are made of filter cloth. The method according to claim 2 or 3,
A stirrer for stirring the sludge to be loaded on the first conveyor belt or the second conveyor belt is installed in at least one horizontal conveying section of the horizontal conveying sections of the first conveyor belt and the second conveyor belt,
The agitator includes a panel disposed in a direction perpendicular to the moving direction of the first conveyor belt or the second conveyor belt, and a panel extending and protruding in a direction perpendicular to the longitudinal direction of the panel and being loaded on the first conveyor belt or the second conveyor belt, And a plurality of projections in contact with the sludge. The method of claim 2,
Further comprising an electromagnetic wave generator for applying an electromagnetic wave having a frequency of 30 to 50 kHz to the sludge moving along the conveyor belt, wherein movement of moisture in the sludge conveyed by the electromagnetic wave from the electromagnetic wave generator and carried on the conveyor belt The drying device being activated. The method of claim 2,
Wherein at least one of an inlet and an outlet of the air is provided with an electromagnet to which an alternating current having a frequency of 30 to 50 kHz is applied to form an electric field in the sludge and air circulated in the housing,
KR1020160025479A 2016-03-03 2016-03-03 Apparatus for drying sludges KR101665973B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190042364A (en) 2017-10-16 2019-04-24 한국전기연구원 Belt type sludge dryer with air fluid control functions
KR102151062B1 (en) * 2020-01-23 2020-09-02 거림환경 주식회사 Dewatering sludge dryer
CN112479546A (en) * 2019-09-12 2021-03-12 广州新致晟环保科技有限公司 Sludge drying device and operation method

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Publication number Priority date Publication date Assignee Title
KR20190042364A (en) 2017-10-16 2019-04-24 한국전기연구원 Belt type sludge dryer with air fluid control functions
KR102372159B1 (en) * 2017-10-16 2022-03-07 한국전기연구원 Belt type sludge drying device with matching air flow path for sludge transfer section
CN112479546A (en) * 2019-09-12 2021-03-12 广州新致晟环保科技有限公司 Sludge drying device and operation method
KR102151062B1 (en) * 2020-01-23 2020-09-02 거림환경 주식회사 Dewatering sludge dryer

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