KR20030038288A - drying device for sludge - Google Patents

Abstract

PURPOSE: A sludge drier is provided, which uses a shaftless spiral screw to greatly reduce sludge adhesion to the screw thus increasing sludge transferring rate, smoothing sludge agitation during movement, so that the drier can be made by a small size. CONSTITUTION: The sludge drier comprises a horizontal cylindrical drying chamber(10), at one top end of which a sludge feeding hopper(12) is installed and at the inner bottom of which supporting stands are installed in longitudinal direction; a heating device(20) installed around the drying chamber(10); driving device(42,40) connected to a screw shaft(30) at one side opening of the drying chamber(10); a shaftless spiral screw(30) removably installed in the driving device(42,40) to rest on the supporting stands to form the shaftless spiral screw(30).

Description

Drying device for sludge

The present invention relates to a drying apparatus for drying sludge, such as sewage sludge, satin wastewater sludge, and axial sludge, and more particularly, to a sludge drying apparatus using a spindleless spiral screw.

Generally, oil and inorganic sludges such as wastewater and manure, which are generated from various industrial sites such as food factories, textile and paper mills, sewage treatment plants, and livestock farms, have high moisture content of about 75 to 95%. It is a substance.

In case of reclaiming such moist sludges, soil and groundwater contamination and environmental pollution are caused by leachate generated in large quantities. Most sludges are dehydrated or dried below a certain moisture content, and then incinerated, recycled, and landfilled. Treatment by ocean dumping.

The sludge can be burned by dehydrating and drying the contained water to less than 30 ~ 40%, which is enough for recycling as an energy resource, and it can be landfilled in accordance with the standard as a landfill material. Drying apparatuses have been developed.

However, in order to form the sludge moisture content below 30 ~ 40% by the dehydration device, a considerable expensive facility is required, and even in order to dry the sludge water content below 60% by the drying device, Processing fee is required.

In the apparatus for drying the sludge with high moisture content, a method of directly drying the sludge by hot air while transferring the sludge to a conveying device, and indirectly drying the slits while contacting the heat-transfer surface of the inner or outer surface of the cylinder heated by a heater or steam, etc. There is a drying method.

However, the drying apparatuses provided so far used in the direct and indirect drying methods have sludge adhered to the dryer wall or the conveying apparatus due to the high viscosity of the sludge, and the drying speed is low, so the drying efficiency is very low. There were many problems, and because of the complicated structure of the conveying device and the large number of mechanical driving parts, the frequency of failure was high, and the life of the device was short.

In particular, in the conventional method of using the screw as a sludge conveying means of the existing drying devices provided so far, the main shaft type screw having a spiral blade around the central thick diameter of the main shaft is used.

When the sludge conveying device uses a spindle screw as described above, the sludge conveying device easily sticks to the spindle and the screw blades due to the characteristic of high viscosity sludge during the conveying, and the agitation is difficult due to the coarse diameter of the spindle. There was a disadvantage that the load of the drive is increased and the speed is slow,

In the direct drying method, the sludges transferred are unevenly contacted with the heat source, resulting in very low drying efficiency.

In the indirect drying method, the sludge is attached to the heat transfer surface, which lowers the heat transfer rate. Thus, there is a problem in that the drying efficiency is lower than that of the applied heat. In order to solve this problem, it is necessary to clean the spindle screw or the sludge adhered to the heat transfer surface from time to time. There was this.

The present invention is provided to solve the disadvantages and problems of the conventional drying apparatus as described above, the structure is simple, easy disassembly and assembly, the installation space is small, but the sludge agitation is excellent while minimizing the driving force Therefore, it is possible to drastically lower the water content of sludge by high drying efficiency and to provide a sludge drying apparatus with high economic efficiency.

1 is a plan view of a drying apparatus of an embodiment according to the present invention

Figure 2 is a longitudinal sectional view showing the interior of the drying apparatus of the embodiment

3 is an enlarged cross-sectional view of the drying chamber tip in FIG.

Figure 4 is an enlarged cross-sectional view of the sludge inlet portion of Figure 2

5 is a cross-sectional view taken along the line A-A of FIG.

Figure 6 is another embodiment of the conveying means of the configuration of the present invention

Figure 7 is a cross-sectional view of a drying apparatus of another embodiment of the present invention

Figure 8 is an enlarged cross-sectional view of a part of another embodiment drying apparatus of the present invention

(Short description of symbols for the main parts of the drawing)

10: drying chamber 11: stand 12: slot hopper

13: Support 14: Drain 15 of the heating water tank: Gas barrier plate

16: Gas outlet 20: Heating water tank 21: Steam inlet of heating water tank

22: steam outlet of the heating water tank 25: insulation

30: spindleless spiral screw

31: spindleless spiral screw fixed disc

32: holder for spindleless spiral screw 35: stirring pin

40: drive motor 41: drive shaft 42: drive disk

50: heated water pipe 51: water pipe support plate 52: rotating shaft

53: bearing 54: heated water pipe support

55: steam inlet of the heated water pipe 56: steam outlet of the heated water pipe

The configuration of the present invention for achieving the above object,

A drying chamber having a hopper for inserting a sludge on the upper side and having a plurality of supporting pieces long in the longitudinal direction at a lower side thereof, and a cylindrically formed cylinder in a longitudinal direction, and a heating having a predetermined length with respect to the outer surface of the drying chamber. Sudan,

A driving means attached to a flange joint at one side opening of the drying chamber;

Removably attached to the drive means characterized in that it comprises a spindle-free spiral screw mounted on the upper surface of the support pieces in the drying chamber.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 is a plan view of a drying apparatus of an embodiment according to the present invention,

Figure 2 is a longitudinal sectional view showing the interior of the drying apparatus of the embodiment,

3 is an enlarged cross-sectional view of the drying chamber tip in FIG. 2;

Figure 4 is an enlarged cross-sectional view of the sludge inlet portion in Figure 2,

5 is a cross-sectional view taken along the line A-A of FIG.

In one embodiment, the drying apparatus includes a cylindrical drying chamber 10 laid in the longitudinal direction, a heating water tank 20 integrally installed on an outer surface of the drying chamber 10, and installed inside the drying chamber 10. It is composed of a non-spindle spiral screw 30, the drive motor 40 for rotating the spindle-free spiral screw 30.

The drying chamber 10 supports a cylinder of a predetermined length with several pedestals 11 at the bottom surface, and an hopper 12 for inserting sludge is installed on one side of the upper side, and a long and low height in the longitudinal direction on the inner side thereof. Several base pieces 13 are attached at regular intervals.

The outer periphery of the drying chamber 10 is formed integrally with the heating water tank 20 of a predetermined width from the front side of the sludge hopper 12 to one side of the front end, the heat insulating material 25 on the outer surface of the heating water tank 20 Is installed.

One side opening of the drying chamber 10 is attached to the drive motor 40 is attached to the flange joint, the drive shaft 41 of the drive motor 40 is driven in the state introduced into the drying chamber 10 The disk 42 is attached integrally.

In the drying chamber 10, a non-spindle spiral screw 30 having a diameter smaller than the inner diameter of the drying chamber 10 is installed for sludge conveyance corresponding to the entire length.

The spindleless spiral screw 30 is detachably connected and driven by a drive disk 42 and a fixed disk 31 of the drive shaft, and a portion of the lower end of the screw blade is supported by a supporting piece (inside the drying chamber 10). 13) is mounted on the upper surface of them.

On the other hand, the cylindrical tip of the drying chamber 10 is formed as a sludge discharge port, the gas barrier plate 15 of a predetermined width is attached to the upper front end, the gas outlet 16 is provided at the upper end.

Reference numeral 14 denotes discharge ports of the heating tank, reference numerals 21 and 22 denote steam inlets and steam outlets of the heating tank, and reference numeral 32 denotes a holder for fixing the spindleless spiral screw 30 and the fixed disk 31.

The sludge drying operation by the sludge drying apparatus of one embodiment of the present invention as described above is carried out as follows.

The heating water tank 20 installed around the outer surface of the drying chamber 10 is piped to a steam heating device (not shown) and a steam circulation circuit through the steam inlet 21 and the steam outlet 22 to supply a predetermined temperature of high temperature steam. While the driving motor 40 is operated, the spindleless spiral screw 30 is rotated in the forward direction to prepare for sludge drying operation.

When the cylinder of the drying chamber 10 is heated to a constant temperature by a predetermined value of high temperature steam supplied to the heating water tank 20, the sludge inlet 12 is continuously connected to the sludge inlet 12 at the rear end of the drying chamber 10. Input.

The sludge which is continuously introduced into the rear end of the drying chamber 10 by the sludge inlet 12 is transferred to the tip side of the drying chamber 10 by the spindleless spiral screw 30 which rotates in the forward direction. The sludge conveyed is gradually dried by the connection to the heated inner wall of the drying chamber 10 and the internal temperature of the drying chamber 10.

Since the gas generated during the sludge drying process is mostly raised, the rising gases are collected above the inside of the drying chamber 10 by the gas blocking plate 15 installed at the top of the front end of the drying chamber 10. The collected gases are discharged to the outside by the gas outlet 16 and are treated by a separate gas treatment device.

According to the drying operation of the drying apparatus according to the embodiment of the present invention as described above, sludges introduced into the rear end of the drying chamber 10 through the inlet 12 are transferred to the front end side by the spindleless spiral screw 30. At the front end by being pushed to the front end side by the blade of the spindle-free spiral screw 30, the initial sludge injected into the rear end side of the drying chamber 10 is high in moisture content and high viscosity, so it is not easily pushed in the forward direction. There is a characteristic that the sludge stirring action is forcibly inverted by the blade of the spindleless spiral screw 30 is rotated.

The sludge agitation action by the spindleless spiral screw 30 is characterized by the fact that most of the screw applying drying chamber is formed long, so that the main shaft should be formed with a thick diameter in order to transmit the driving force to the long rotating spindle at one end of the drying chamber. Unlike the common spindle screw is a characteristic that occurs due to the cylindrical passage is formed in the central portion of the screw.

That is, the general spindle type screw should be moved forward only in the space between the blades of the narrow width screw except for the thicker spindle when used in the sludge feeder. This cannot happen, and the sludge is easily adhered to the spindle and the screw blade in the process, because the viscous sludge is easily adhered to the spindle and the screw blade, and thus the spindle screw requires high driving force for rotational driving. On the contrary,

The feed screw of the present invention uses a non-spindle spiral screw 30 without a main shaft, so that the slot is pushed upward by the lower wing of the screw located at the lower end of the drying chamber 10 to receive upward movement. As a result of being pushed into the cylindrical passage part of the hollow space formed at the center of the wing of the screw, the stirring action takes place. Therefore, there is no resistance due to the wing of the screw or the main shaft, so even if the slot is highly viscous, the adhesion rate is very small. Together with the characteristics of being pushed smoothly in the forward direction.

The sludge drying apparatus described above is a drying means of a sludge conveyed by a non-spin spiral screw inside the drying chamber, and a heating water tank is installed around the outer wall of the drying chamber, but the secondary heating is performed to increase drying efficiency. It may also comprise a means further.

The configuration of the sludge drying apparatus of another embodiment having this secondary heating means is

While the sludge drying apparatus described above is used as it is, a pipe-type secondary heating means is disposed in a cylindrical space formed in the center of the non-spindle spiral screw in the drying chamber, and a rear end of the secondary heating means is provided. The side is rotatably supported with the inside of the holder of the spindle-free spiral screw and the front end is supported by the heating tube support from the outside of the drying chamber, the heating circuit of the secondary heating means integrally with the heating means installed on the outer surface of the drying chamber. It further comprises a configuration for connecting.

Fig. 7 shows a sludge drying apparatus of another embodiment having the secondary heating means.

The configuration of the sludge drying apparatus of another embodiment having this secondary heating means is

In addition to using the sludge drying apparatus configuration of one embodiment as it is,

Inside the drying chamber 10, several rows of heating water pipes 50 are disposed in the cylindrical space formed in the center of the spindleless spiral screw 30, and the rear end side of the heating water pipe 50 is connected to the water pipe support plate 51. The water pipe support plate 51 is pivotally attached to the rear end of the water pipe support plate 51 so that the water pipe support plate 51 is freely rotatably formed by a bearing 53 at the center of the holder 31 of the spindleless spiral screw. The front end side of the drying chamber 10 is fixedly supported by the heated water pipe support 54 at intervals from the front end to the front side, the steam inlet 55 and outlet 56 of the heated water pipe 50 are respectively the drying chamber ( 10) is connected to the steam circulation circuit of the heating water tank 20 installed on the outer surface.

According to the sludge drying apparatus of another embodiment having such a secondary heating means,

The row of heated water pipes 50 arranged in the cylindrical space portion formed in the central portion of the spindleless spiral screw 30 has a front end fixed to the heated water pipe support 54 at the front outside of the drying chamber 10, and the rear end thereof. In the state fixed to the water pipe support plate 51, this water pipe support plate 51 is freely rotated by a bearing 53 at the center of the base 31 of the spindleless spiral screw by the pivot type rotary shaft 52 attached to the rear end. Therefore, even if the spindleless spiral screw 30 is rotated during the drying operation, the heated water pipe 50 is supported in a fixed state in the cylindrical space portion formed in the center of the spindleless spiral screw 30.

Therefore, the sludge drying apparatus of another embodiment having the secondary heating means additionally installed while the same action as the drying action of the sludge drying apparatus of the embodiment having the heating water tank 20 on the outer wall of the drying chamber described above. By heating the air in the drying chamber at the center of the drying chamber 10 by several rows of heating water pipes 50, the upper side of the sludge is heated to have a characteristic of further accelerating the drying heating action, Accordingly, there is an advantage that the high speed drying device or a large capacity drying device can be configured very simply.

In the implementation of the present invention as described above, the configuration of the above-described embodiment is presented as a preferred embodiment of the present invention, but is not necessarily limited thereto.

For example, the heating means for heating the drying chamber in the configuration of the present invention, in addition to the method of heating and supplying hot steam by the steam boiler to the heating water tank 20 installed around the outer surface of the cylinder as in one embodiment, hot water or The heating medium can be circulated and heated, and an electric heater can be used in addition to the heating bath.

In addition, the spindleless spiral screw may be additionally provided with an arbitrary amount of stirring pins 35 on both sides of the wing as shown in FIG. 6 in order to enhance the transfer effect or the stirring action.

In addition, the secondary heating means may be replaced by a pipe-type electric heater tube or a heat medium tube in addition to the illustrated rows of heating water pipes, and the supporting structure of the secondary heating means is a means for supporting the front and the outside of the drying chamber. In addition, it can also be configured by directly supporting the front end of the front end of the drying chamber.

As described above, the present invention is a drying apparatus for drying all sludges such as sewage sludge, satin wastewater sludge, axial sludge sludge, etc., by using a spindle free spiral screw as a means of conveying the sludge,

When the conveying means is compared with the configuration using the spindle screw, the viscosity of the sludge with high moisture content can significantly reduce the adhesion of sludge to the conveying device. Sludge agitation Smooth effect, enhanced driving effect, etc. can be obtained, thereby miniaturizing the drying chamber, which is the main structure of the drying device, into a short length and a small diameter, while the sludge is sufficiently stirred during the conveying of the sludge, the drying chamber as a drying heating means. By increasing the contact rate to the inner wall can significantly improve the sludge drying efficiency,

In the construction of the drying device, the mounting structure of the screw is simplified and the driving means can be reduced, so that the manufacturing cost and the device cost can be greatly reduced.

It is compact and easy to configure with high speed drying device and high capacity drying device.

Simplification of the operation structure, there is almost no breakdown operation, there is no defect in the operation of the drying operation, it is easy to remove the no-spin spiral spiral screw as a transfer device has the advantage of easy cleaning of the drying chamber and maintenance of the entire drying device.

The effects of the present invention as described above can provide a favorable condition in the installation area, installation cost, treatment cost, maintenance costs, etc., which were ultimately considered for installing the sludge drying device in the sludge generator or the sludge treatment company, thereby making it possible to generalize the installation of the sludge drying device. Furthermore, the moisture content of the sludge can be dried very easily to be used as incineration fuel or in accordance with the landfill standard, thereby preventing pollution due to the high water content of the sludge landfill, and recycling the sludge. It has the advantage of being actively induced.

Claims (4)

A drying chamber having a hopper for sludge injecting on the upper side and having a cylindrical base installed at a lower height with several supporting pieces long in the longitudinal direction, Heating means provided with a predetermined length with respect to the outer surface of the drying chamber; A driving means attached to a flange joint at one side opening of the drying chamber; And a spindleless spiral screw detachably attached to the driving means and mounted on the upper surfaces of the supporting pieces in the drying chamber. The sludge drying apparatus according to claim 1, wherein a gas barrier plate is installed at a front end of the drying chamber to collect a gas that rises into the upper portion of the drying chamber and discharge it to a gas outlet. The sludge drying apparatus according to claim 1, wherein both sides of the wing of the spindleless spiral screw are provided with stirring pins of any quantity for sludge transfer and agitation. The cylindrical space part formed in the center part of a non-spin spiral spiral of the inside of a drying chamber of Claim 1, A rear end side is rotatably supported with the inside of the holding | maintenance part of the said spindleless spiral screw, and a front end side is a front outer side of a drying chamber, or the front end center of a drying chamber. The sludge drying apparatus further comprises a pipe-type secondary heating means which is supported by a heating tube support on the side, and the heating circuit is integrally connected with the heating means installed on the outer surface of the drying chamber.