KR20000050228A - Sludge Dryers - Google Patents

Abstract

PURPOSE: An apparatus for drying sludge is provided to readily eject moisture contained in the sludge and to improve dry efficiency by enlarging contact area of the sludge with a heating source, so that large amount of the sludge can be treated. CONSTITUTION: An apparatus for drying sludge comprises a frame(11); a plurality of parts feeders(30, 30') mounted to the frame(11) in a vertical direction with a proper interval, which includes a body(33) provided with a cavity(32) in which a pair of screws(31) driven by a driving device are mounted; connecting devices(34) which connect a sludge outlet of the body(33) of the upper parts feeder(30) and a sludge inlet of the lower parts feeder(30') to form a moving passage; a vapor exhaust device(50) for discharging vapor generated from the sludge moving in the bodies(33) of the respective parts feeders(30); and a device for heating sludge(60), which has a outer casing enclosing outer peripheral surfaces of the bodies(33) of the parts feeders(30) to form a passage for heat transfer mass and supplies the heated heat transfer mass to the outer casing.

Description

Sludge Dryers {Sludge Dryers}

The present invention relates to a sludge drying apparatus, and more particularly, to a sludge drying apparatus which is industrial waste generated in food or dyeing and paper manufacturing process, sewage treatment plant or waste water treatment plant.

In general, industrial waste and sewage sludge produced by treating wastewater discharged from wastewater, dyeing and paper manufacturing processes, and sewage sludge are dehydrated at a water content of 80% to 90% by a mechanical or physical method to be landfilled and incinerated. Or ocean dumping is carried out. In recent years, even in the case of waste mainly composed of liquid components such as food waste, animal waste, etc., the water content is reduced and used as feed or fertilizer.

Many apparatuses for dehydrating and drying such sludges have been developed. Conventional sludge drying apparatuses of the prior art are dried by heating the sludge by hot air using a waste heat generated in a factory or using a separate boiler.

One example of such a conventional sludge drying apparatus is disclosed in Korean Publication Nos. 98-059868, 95-11011, 97-51798, 96-14029, 93-20165, 95-31944, and the like.

An example of the dewatering and rolling apparatus of the papermaking sludge disclosed in Publication No. 93-20165 is shown in FIG. 1.

As shown in the figure, the sludge gun apparatus allows the paper sludge to pass through the troughs 4 and 4a in turn by the scour conveyors 2 and 2 ', and the water discharge ports 5 and 6 are respectively discharged. Between the formed shaft (3) (3a) and the trough (4) (4a) is formed narrower gradually toward the rear, and the heat transfer heater (7) (in the shaft 3a of the screw conveyor (2a) and the outer peripheral surface of the trough (4a) After the installation of 8), the outer cylinders 9 and 9a in which the drainage pipes 10 and 10a are formed outside the troughs 4 and 4a are provided.

In the conventional sludge drying apparatus configured as described above, the grooves 4 and 4a are installed in multiple stages to lengthen the moving distance of the sludge and first extract the moisture, and then the inside of the outer peripheral surface and the shaft 3a of the groove 4a. The drying efficiency is improved by drying the sludge using the installed electrothermal heaters 7 and 8, but a large amount of sludge cannot be processed because it is not easy to secure sufficient heat capacity due to the electrothermal heater. In particular, the drying apparatus can not improve the productivity according to the production by producing the shaft and the trough 3 in a plurality of material pieces. In addition, the heat transfer heaters 7 and 8 are installed on the outer circumferential surface and the shaft of the trough 4a to intensively heat a specific portion, so that sludge is attached to the inner circumferential surface and the shaft of the trough so that the sludge is not smoothly transferred. The trough (4s) and the shaft is composed of a plurality of material pieces are to be discharged therebetween, but there is a problem that the discharge of water vapor is not made smoothly between them filled with sludge.

In the related art, a plurality of conveyors are alternately installed in a chamber to treat a large amount of sludge, and a method of hot air drying the sludge moved by the conveyor has been sought. Could not improve

The present invention is to solve the problems as described above, the sludge drying method and the device which is capable of large-capacity treatment by improving the drying efficiency by increasing the contact area with the heat source of the solidified sludge is easy to discharge moisture contained in the sludge The purpose is to provide.

Another object of the present invention is to provide a sludge drying apparatus that can reduce the loss of heat due to the sludge heating to reduce the maintenance cost according to the operation.

1 is a side view of a partial ablation of the conventional sludge drying apparatus

2 is a perspective view of a sludge drying apparatus according to the present invention

Figure 3 is a perspective view showing an extract of one part feeder

4 is a perspective view showing the driving means;

Figure 5 is a partially cutaway perspective view of the sludge heating means

<Description of the code | symbol about the principal part of drawing>

30; Part feeder 31; screw

33; Main body 34; Hopper

40; Drive means 50; gas discharge means

60; sludge heating means 70; Supply Conveyor

80; Vertical Conveyor

The sludge drying apparatus of the present invention to achieve the above object and the frame;

A plurality of part feeders having a main body provided with a cavity in which a pair of screws which are installed at predetermined intervals in a vertical direction to the frame and are rotated by a driving means therein;

Connecting means for connecting the sludge outlet of the upper part feeder body and the sludge inlet of the lower part feeder to form a moving passage of the sludge;

Steam discharge means for discharging steam generated from the sludge moving inside the main body of each part feeder;

And a sludge heating means having an outer case surrounding the outer circumferential surface of the body part of the body to form a heat exchange medium passage and supplying the heat exchange medium heated to the outer case.

In the present invention, a sludge supply conveyor for supplying sludge to the part feeder at the top is provided. The part feeder further includes a vertical conveying conveyor for supplying sludge which is installed in at least two rows in a vertical direction and dried along one side row to an inlet of the part feeder located at the top of an adjacent row.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 shows an embodiment of a sludge drying apparatus according to the present invention.

As shown, the frame 11 and a pair of screws 31 and 31 rotatably installed and rotatably installed therein are arranged at predetermined intervals in the vertical direction and arranged in at least two rows. ) Is provided with a main body 33 is provided with a cavity 32 is provided with a plurality of part feeder 30, connecting the inlet of the part feeder main body 33 located in the upper part and the lower part feeder 30 ' Hopper 34 and drive means 40 for rotating the screws 31 and 31 of the respective part feeders 30 are provided. And the drying apparatus is a steam discharge means 50 for discharging the steam generated from the sludge moving along the cavity 32 of the main body 33 of each part feeder 30 is installed vertically at predetermined intervals, and the parts Sludge heating means 60 for heating the sludge by heating the main body of the feeder 30 using a heat exchange medium, a sludge supply conveyor 70 for supplying sludge to the inlet of the part feeder located at the top, and a row of And a vertical conveying conveyor (80) for supplying the sludge discharged from the uppermost part feeder to the inlet of the uppermost part beader, which forms an adjacent row.

Hereinafter, each component constituting the sludge drying apparatus will be described in detail.

The frame 11 is composed of a frame but is preferably sealed to the outside so as to enclose each part feeder so that the part feeders 30 and 30 ′ are sealed to improve the thermal efficiency.

Each part feeder 30 has a lower surface of the main body 33 is formed in a curved surface along the outer circumferential surface of each screw 31, 31 and the rotating shaft of the screw 31, 31 is supported at both ends. In addition, a sludge inlet 33a is formed at one inlet of the main body 33 and a sludge is moved by a screw, and a sludge outlet 33b is formed at an outlet side.

The screws 31 and 31 ′ are driven by the driving means 40. The gear mounting portion 33c partitioned at one end of the main body 33 is installed, and each screw 33c is mounted on each screw. Gears 42 and 43 fixed to the rotation shafts of the 31 and 31 'are engaged so that when the screw on one side is rotated, the two screws 31 and 31' are rotated at the same time. One side of the rotating shaft 41 of the screw protrudes from the main body 33, the driven sprocket 44 is installed, the sprocket is a drive sprocket 46 and the chain is installed on the drive shaft 45a of the geared motor 45 Connected by 47.

The steam discharging means 50 discharges steam generated when the sludge is dried, and includes a plurality of branch pipes 51 and respective branch pipes connected to an upper portion of the main body 33 of each part feeder 31, 31 ′. An exhaust pipe (53) consisting of a main pipe (52) to which the 51 is connected, and a steam exhaust blower (54) installed in the exhaust pipe (53).

The sludge heating means 60 is for heating the sludge moved along the Katy 32 by rotating the screws 31, 31 'of the part feeder 30, an embodiment of which is shown in FIG.

As illustrated, the outer case 62 and the outer case 62 are formed integrally with the main body so as to be spaced apart from the outer circumferential surface of the main body 33 of each part feeder to form a heat exchange medium passage 61. And a supply pipe 63 and a discharge pipe 64 connected to the heat exchange medium passage 61 and a boiler 65 connected to the supply pipe 63 and the discharge pipe 64. At least one pump 66 for pumping the heat exchange medium heated by the boiler 65 is installed on the supply pipe 63. When a plurality of pumps are installed, the pumps are preferably installed in parallel. In addition, a valve may be installed in the supply pipe and the discharge pipe in the supply pipe, and a check valve may be further installed in the supply pipe. In addition, the heat exchange medium of the sludge heating means preferably uses a liquid such as mercury having a high boiling point, and may also use steam. When steam is used as the heat exchange medium of the sludge heating means, a pressure reducing valve is installed in the heat exchange medium supply pipe. And it is preferable to allow the exhaust gas or heat exchange medium containing waste heat to be supplied by the boiler inside the tubular screw rotation shaft. At this time, it is preferable to connect the rotary shaft of the screw and the supply pipe by using a rotary joint.

The feed conveyor 70 is a conventional conveyor can be used to supply the sludge to the inlet of the part feeder located at the top, respectively, the vertical conveying conveyor is dried from a row of part feeders installed vertically to the bottom part A screw conveyor basket elevator is used to feed the sludge discharged to the feeder to the inlet of the part feeder located at the top of the adjacent row.

Referring to the operation of the sludge drying apparatus according to the present invention configured as described above in detail.

In order to dry the sludge using the sludge drying apparatus according to the present invention, first, the boiler 65 of the sludge heating means 60 is operated to heat the heated heat exchange medium, and the heated heat exchange medium is pumped in the supply pipe 63. The main body of the part feeder 30 is heated by circulating through the heat exchange medium passage 61 formed in the outer case 62 and the main body 33 using the 65. Then, the geared motor 45 of the driving means 40 is driven to drive a pair of screws.

In this state, the sludge is supplied to the sludge inlet 33a of the part feeder 30 located at the top using the feed conveyor 70. The supplied sludge is primarily dried while moving the inside of the main body 33 of the part feeder 30 located at the uppermost part, and the first dried sludge is the part feeder 30 positioned at the outlet and the lower part of the main body 33. Through the hopper 34 connecting the sludge inlet (33) of ') is introduced into the part feeder (30') located at the bottom. The introduced sludge is secondary dried when moved along the inside of the main body by the screws 31 and 31 ′ operated as described above. By repeated drying as described above, the sludge is dried in multiple stages, and the solids discharged to the outlet from the part feeder located at the bottom (the sludge dried solids) are located at the top of the adjacent rows by the vertical transfer conveyor 80. It flows into the inlet of the part feeder and is continuously dried as described above.

As described above, steam generated in the process of drying the sludge is discharged by the steam discharge means 50. That is, the main body of each part feeder is connected to the main pipe 52 by the branch pipe 51, and since the blower 54 is installed in the main pipe 52, the main body is blown by the blowing force of the blower 54. Steam generated during sludge drying from the cavity is discharged smoothly.

As described above, the sludge drying apparatus according to the present invention can improve the drying efficiency of the sludge because the sludge is dried in multiple stages and the discharge of the steam is made smoothly, and a pair of part feeders are installed in the main body. The sludge can be dried. In addition, since the present invention indirectly heats the main body by a heat exchange medium, it is possible to fundamentally solve the sludge sticking phenomenon generated by intensively heating a specific part of the main body.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be defined only in the appended claims.

Claims (5)

A frame; A plurality of part feeders having a main body provided with a cavity in which a pair of screws which are installed at predetermined intervals in a vertical direction to the frame and are rotated by a driving means therein; Connecting means for connecting the sludge outlet of the upper part feeder body and the sludge inlet of the lower part feeder to form a moving passage of the sludge; Steam discharge means for discharging steam generated from the sludge moving inside the main body of each part feeder; And a sludge heating means for supplying a heat exchange medium heated to the outer case, the outer case surrounding the outer circumferential surface of the body part to form a heat exchange medium passage. The method of claim 1, The steam discharge means A sludge drying apparatus comprising an exhaust pipe connected to a main body of each part peter, and a blower installed in the exhaust pipe. The method of claim 1, The sludge heating means includes an outer case surrounding the outer circumferential surface of the body to form a heat exchange medium passage, a boiler connected by a heat exchange medium passage formed by the outer case, a supply pipe and a discharge pipe, and a pump installed in the supply pipe. Sludge drying device characterized in that. The method of claim 1, And a sludge supply conveyor for supplying sludge to the uppermost part feeder, and a discharge conveyor for discharging the solid material discharged from the lowermost part feeder. The method of claim 1, Sludge drying, characterized in that the part feeder is further provided with a vertical conveying conveyor installed in at least two rows in the vertical direction and conveys the sludge discharged from the lowermost part feeder in a row to the inlet of the part feeder located at the top of the adjacent row. Device.