KR102097709B1 - Sludge Floating Screw And System for Drying Sludge Using the Same - Google Patents

Abstract

The present invention is a sludge flotation type screw capable of improving the drying efficiency by conveying sludge in a drying chamber while continuously transporting the sludge to a drying chamber composed of multiple stages, burning and drying, and high temperature generated during drying treatment. An environmentally friendly sludge drying treatment system capable of deodorizing while transferring superheated air through a closed circuit and improving drying efficiency using waste heat, wherein the sludge flotation screw according to the present invention is axially inside the drying chamber. A rod-shaped screw shaft rotated by the driving unit; A plurality of holder members in a ring shape in which a hole into which the screw shaft is inserted is formed in a central portion and arranged at a distance along an axial direction on an outer surface of the screw shaft; And a plurality of floating blades arranged at intervals along the circumferential direction between the respective holder members.

Description

Sludge Floating Screw And System for Drying Sludge Using the Same

The present invention relates to a sludge drying treatment system, and more specifically, sludge flotation type screws that can improve the drying efficiency by transporting sludge such as sewage, manure, and livestock waste water in a drying chamber and using the same. It relates to an environmentally friendly sludge drying treatment system.

In general, a large amount of sludge is generated in the process of treating wastes such as domestic sewage, manure, livestock wastewater, and factory wastewater, and these sludges are dehydrated to separate or dry the cake. It is removed by incineration using a device.

However, as the method of landfilling waste is dewatered by sludge, the cake is buried in a separate landfill, so it is not only limited to the selection of a landfill site, but also causes severe odors in the surroundings as well as damage to health. In addition, there was a problem that water and air pollution problems caused by leachate were caused.

Therefore, a method of embedding water in a sludge by dewatering and drying the water contained in the sludge generated in the process of waste treatment and then incineration using a heating device such as an incinerator has been developed.

Most of the sludge incineration devices currently used (sludge drying treatment device) adopt a method of transferring sludge in one direction using a screw in the drying chamber, and supplying thermal power of 1000 ° C or more into the drying chamber to burn and dry the sludge. have.

However, in the conventional sludge drying treatment apparatus, a sludge drying treatment apparatus is also used in which a drying chamber is configured to be composed of three or more multi-stages to increase the transport distance of sludge in order to completely burn the sludge, but each drying chamber is also used. Since it is necessary to provide fire power into the furnace, a large amount of heat is required, and the effect of increasing the sludge transfer distance is also limited.

In addition, the conventional sludge drying treatment device not only generates heat loss because the high-temperature gas used for combustion of the sludge is discharged to the outside, but also requires a separate dehumidifying facility to process a large amount of water separated from the sludge during the drying process. There is a problem.

Registered Patent No. 10-0892649 (Registered on Apr. 02, 2009) Registered Patent No. 10-0534084 (Registered on Nov. 30, 2005) Patent Publication No. 10-2005-0072860 (published on July 12, 2005)

The present invention is to solve the problems as described above, the object of the present invention is to provide a sludge flotation type screw that can improve the drying efficiency by conveying while supporting the sludge in the drying chamber.

Another object of the present invention is to burn and dry the sludge continuously while transferring it to a drying chamber composed of multiple stages, to deodorize it while transferring high-temperature superheated air generated during the drying process through a closed circuit, and to use the waste heat to improve drying efficiency. It is to provide an environmentally friendly sludge drying treatment system that can be improved.

Sludge flotation type screw according to the present invention for achieving the above object is installed to extend in the axial direction inside the drying chamber, the rod-shaped screw shaft rotated by the drive unit; A plurality of holder members in a ring shape in which a hole into which the screw shaft is inserted is formed in a central portion and arranged at a distance along an axial direction on an outer surface of the screw shaft; And a plurality of floating blades arranged at intervals along the circumferential direction between the respective holder members.

And the eco-friendly sludge drying treatment system of the present invention, a drying chamber in which a sludge flotation type screw having a configuration as described above is installed; A circulation passage through which one end is connected to the overheating air outlet of the drying chamber, and the other end is connected to one side of the drying chamber to circulate the superheated air discharged from the drying chamber and supply it into the drying chamber; A dust collector installed on the circulation passage to collect foreign substances from superheated air flowing along the circulation passage; A bypass flow path for guiding a part of the superheated air that is branched from the circulation flow path and passes through the dust collector; A deodorizer installed on the bypass channel to remove odor by heating superheated air flowing along the bypass channel; At least one heat exchanger installed at a location where the circulation flow path and the bypass flow path meet to exchange heat between the superheated air flowing along the circulation flow path and the superheated air that has passed through the deodorizer; And an exhaust unit that cools the superheated air in the bypass passage passing through the heat exchanger and discharges the cooled gas to the outside.

In the sludge flotation screw of the present invention, a plurality of flotation blades are arranged at regular intervals on the outer surface of the screw shaft, and each flotation blade has an arrangement structure spirally twisted from one end to the other end of the screw shaft, so that the sludge drying chamber It can be lifted upward and floated in the air while being transported in the longitudinal direction.

Therefore, the time for the sludge to contact the hot air supplied to the drying chamber increases, and at the same time, the contact area with the hot air is widened, so that the drying efficiency can be greatly improved.

The sludge drying treatment system of the present invention can be reheated through a heat exchanger while circulating the superheated air discharged from the drying chamber and re-supplied into the drying chamber, thereby obtaining an energy saving effect due to waste heat recovery.

In addition, the odor of the exhaust gas that has passed through the deodorizer can be removed and discharged, and the high-temperature exhaust gas that has passed through the deodorizer can be used for heat exchange to obtain an energy saving effect due to the recovery of waste heat as described above.

1 is a block diagram showing an environment-friendly sludge drying treatment system according to an embodiment of the present invention.
2 is a perspective view showing an embodiment of a drying unit configured in a sludge drying treatment system according to the present invention.
3 is a cross-sectional view showing a state in which a sludge flotation screw is installed according to an embodiment of the present invention.
FIG. 4 is a perspective view of the sludge flotation screw shown in FIG. 3.
5 is a perspective view of a portion of the sludge flotation screw shown in FIG. 3;
6 is a cross-sectional view seen from the front of the sludge flotation screw shown in FIG. 3.
7 is an exploded perspective view of a sludge flotation screw according to another embodiment of the present invention.
8 is a cross-sectional view seen from the front showing another embodiment of the drying unit configured in the eco-friendly sludge drying treatment system of the present invention.
9 is a perspective view of a portion of the drying unit shown in FIG.

The configuration shown in the embodiments and drawings described in this specification is only a preferred example of the disclosed invention, and at the time of filing of the present application, there may be various modifications that can replace the embodiments and drawings of the present specification.

Hereinafter, a sludge flotation screw and an eco-friendly sludge drying treatment system using the same will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings indicate the same components.

1 is a view showing an eco-friendly sludge drying treatment system according to an embodiment of the present invention, FIG. 2 is a view showing a configuration of a drying unit of a sludge drying treatment system, and FIGS. 3 to 6 are in one embodiment of the present invention It is a view showing the configuration of the sludge flotation type screw.

Referring first to FIG. 1, the sludge drying treatment system of the present invention includes a drying unit 1 in which a plurality of drying chambers 10 in which sludge is dried are arranged in multiple stages, and a drying chamber 10 of the drying unit 1 ) Circulating the high-temperature superheated air discharged from the circulating flow path (2), which is supplied to the drying chamber (10) to recover waste heat, and superheat installed on the circulation flow path (2) and flowing along the circulation flow path (2) On the bypass passage (3), the bypass passage (3), which guides a part of the superheated air that is branched from the circulation passage (2) and passes through the dust collector (4) to collect foreign substances from the air. A deodorizer (5) installed to remove odor by heating superheated air flowing along the bypass passage (3), the circulation passage (2) and the bypass passage (3) are installed at a location where the circulation passage (2) Heat exchange between the superheated air flowing along) and the superheated air that has passed through the deodorizer (5). The first heat exchanger (6) and the second heat exchanger (7), the first heat exchanger (6), and the second heat exchanger (7) passing through the bypass passage (3) passing through the exhaust air It includes an exhaust unit.

As shown in FIG. 2, in this embodiment, the drying unit 1 includes a plurality of drying chambers 10 arranged vertically and having multiple stages (5 stages in this example). Each of the drying chambers 10 is connected at the end thereof in a zigzag manner to be dried while sequentially transferring sludge from the upper drying chamber 10 to the lower drying chamber 10. That is, the first drying chamber 10 at the uppermost end is connected to the rear end of the drying chamber 10 at the second stage below it, and the front end of the drying chamber 10 at the second stage is the drying chamber at the third stage below it. In the manner connected to the front end of (10), the ends of each drying chamber 10 are connected in a zigzag form.

The drying section 1 may include only one row of drying chambers 10 arranged in five stages vertically, but as shown in FIG. 3, a plurality of drying chambers (5 stages in this embodiment) 10 ) Can be arranged laterally in a plurality of rows (6 rows in this embodiment).

One end of the drying chamber 10 configured in each row is connected to the circulation passage 2 to receive hot air and heat the sludge to dry it.

In addition, inside each drying chamber 10, a screw for transferring the sludge in the axial direction (longitudinal direction) of the drying chamber 10 is configured. All of the screws constituting the plurality of drying chambers 10 may apply the sludge flotation screw 100 of the present invention described below, but only partially apply the sludge flotation screw 100 of the present invention and remain dry. The chamber 10 may be configured by applying a known screw (for example, a screw disclosed in Korean Registered Utility Model No. 20-0225013 or Korean Registered Utility Model No. 20-0206603).

For example, a known screw is installed in the drying chamber 10 of the first stage from the top of the first stage to the drying chamber 10 of the fourth stage, and the sludge flotation screw of the present invention is installed in the drying chamber 10 of the fifth stage at the bottom. 100) can be installed.

Referring to FIG. 1 again, the circulation passage 2 has one end connected to the overheated air outlets of the plurality of drying chambers 10 and the other end connected to one side of a portion of the plurality of drying chambers 10 to dry. It functions to circulate the superheated air discharged from the chamber 10.

The dust collector (4) is installed at the beginning of the circulation passage (2) to perform a function of filtering foreign substances such as dust from the superheated air discharged from the drying chamber (10), and can be constructed by applying a known dry dust collector. You can.

The bypass passage 3 guides a part of the superheated air that is branched from the circulation passage 2 at the rear side of the dust collector 4 and moves along the circulation passage 2.

The deodorizer (5) is installed on the bypass flow path (3) by heating the superheated air flowing along the bypass flow path (3) to a high temperature of about 800 ℃ deodorization by removing the odor molecules contained in the superheated air Perform a function.

The first heat exchanger (6) and the second heat exchanger (7) are in a relatively low temperature state that flows along the circulating flow path (2) with the superheated air having a relatively high temperature through which the odor is removed through the deodorizer (5). The superheated air is sequentially exchanged to heat superheated air flowing along the circulation path (2).

The superheated air in the circulation passage 2 heated while passing through the first heat exchanger 6 and the second heat exchanger 7 is supplied into the drying chamber 10 to be used for drying treatment of the sludge. And the superheated air in the bypass flow path 3 whose temperature is lowered while passing through the first heat exchanger 6 and the second heat exchanger 7 is discharged to the outside through the exhaust unit. At this time, since the superheated air of the bypass flow passage 3 passes through the first heat exchanger 6 and the second heat exchanger 7, the temperature is still high, reaching about 300 to 500 ° C even if the temperature decreases. The temperature of the product must be lowered considerably and discharged to the outside.

Therefore, the exhaust unit includes a scrubber (8) for performing cooling treatment and dust collection of superheated air (exhaust gas), and an exhaust passage (9) for guiding the cooled and purified gas to the outside while passing through the scrubber (8). can do.

As described above, in the sludge drying treatment system of the present invention, the superheated air discharged from the drying chamber 10 circulates through the circulation passage 2, and the superheated air flowing through the circulation passage 2 is the first and second heat exchangers ( 6, 7) is heated by the high-temperature superheated air discharged from the deodorizer 2 and can be re-supplied into the drying chamber 10 for use. The odor of the exhaust gas can also be removed through the deodorizer 5.

In addition, without installing a separate burner and piping for supplying hot air to the drying chamber 10, it is possible to heat the superheated air circulating along the circulation path 2 and supply it into the drying chamber 10, thereby simplifying the entire facility. There is also an effect that can significantly reduce the manufacturing cost of the equipment.

On the other hand, the sludge flotation type screw 100 installed inside the drying chamber 10 of the drying unit 1 conveys the sludge along the longitudinal direction of the drying chamber 10 to float the sludge into the air, and in a space of a predetermined size. This greatly increases the transport distance of the sludge, thereby improving the drying treatment efficiency of the sludge.

3 to 6, the sludge flotation screw 100 according to an embodiment of the present invention is installed to extend in the axial direction (longitudinal direction) inside the drying chamber 10 and rotates by a driving unit A rod-shaped screw shaft 110, a plurality of holder members 120 arranged at a distance along the axial direction on the outer surface of the screw shaft 110, and along the circumferential direction between each of the holder members 120 It includes a plurality of flotation blades 130 arranged at intervals.

The screw shaft 110 is installed to extend along the longitudinal direction inside the drying chamber 10, and the end portion passes through the end portion of the drying chamber 10 and is connected to a screw drive configured externally to rotate. Although not shown in the drawing, the screw drive unit may include a motor, and a power transmission member made of a pulley, a belt, or a gear for transmitting power of the motor to the screw shaft 110.

It is preferable that the center of the screw shaft 110 is disposed at an eccentric position at a predetermined distance from the center of the drying chamber 10 to the lower side. As described above, the screw shaft 110 is disposed at the bottom of the drying chamber 10 to increase the floating height of the sludge to further improve the drying efficiency of the sludge.

The holder member 120 is in the form of a circular ring in which a hole into which the screw shaft 110 is inserted is formed in the central portion, and is fixed to the outer surface of the screw shaft 110. The holder member 120 may be fixed in such a way that the periphery of the central hole is welded to the screw shaft 110, but may also be fixed to the screw shaft 110 by fastening means such as screws or bolts.

Transfer and flotation of sludge can be achieved by the flotation blade 130. The floating blades 130 are installed in plurality (four in this embodiment) between each holder member 120, and the floating blades 130 installed between each holder member 120 have regular intervals along the circumferential direction. (90 ° intervals in this example). The floating blade 130 is fixed to the periphery of the holder member 120 and spaced a certain distance from the outer surface of the screw shaft 110.

In addition, the flotation blades 130 are twisted at a constant angle with respect to the axial direction of the screw shaft 110 so that each flotation blade 130 has a function of supporting sludge and a function of transferring sludge in the axial direction. Is installed, a plurality of floating blades 130 disposed between each of the holder member 120 is disposed to be continuously connected to a plurality of floating blades 130 disposed between the adjacent holder member 120, each The floating blade 130 is formed to be twisted in a spiral along the axial direction from one end of the screw shaft 110 to the other end.

Each of the floating blades 130 may be formed of a straight bar, or may be formed of a straight bar having a straight cross-section or a bar having a 'L'-shaped cross section as in this embodiment. When the flotation blade 130 is made of a bar having an 'L'-shaped cross section, it has the advantage of increasing the flotation force by acting to increase the sludge.

And each of the flotation blades 130 may be fixed by welding both ends to the surface of the holder member 120, but when the flotation blades 130 are made of straight bars having a straight cross-section, as shown in FIG. A plurality of coupling grooves 121 are formed in the radial direction in the holder member 120, and the end of the flotation blade 130 may be inserted into the coupling groove 121 and fixed. Of course, even in this case, the both ends of the flotation blade 130 are fixed to the holder member 120 by welding the both ends of the flotation blade 130 to the holder member 120 by means of fastening means such as bolts and nuts, so that the flotation blade 130 is coupled to the coupling groove 121. It is desirable not to deviate.

As described above, in the sludge flotation type screw 100 of the present invention, a plurality of flotation blades 130 are arranged at regular intervals on the outer surface of the screw shaft 110, and each flotation blade 130 of the screw shaft 110 is Since it has an arrangement structure spirally twisted from one end to the other, it is possible to lift the sludge in the longitudinal direction of the drying chamber 10 and lift it upwards to float it into the air.

Therefore, the time in which the sludge comes into contact with the hot air supplied to the drying chamber 10 increases, and at the same time, the contact area with the hot air increases, so that the drying efficiency can be greatly improved.

On the other hand, when the drying chamber 10 is configured in multiple stages in the drying unit 1 of the drying system and sufficient drying is performed in the upper stage, the drying chamber 10 in the lower stage cools the sludge rather than combustion through heating of the sludge and transfers the process. Can be done.

To this end, as in the other embodiment of the drying unit shown in FIGS. 8 and 9, the buffer chamber 20 is provided on one side of the drying chamber 10 configured in the lower portion of the drying unit configured in the eco-friendly sludge drying treatment system of the present invention. It is formed to be in communication, and a cooling screw 30 is installed inside the buffer chamber 20 to lift the sludge upward and re-enter the drying chamber 10 inside.

The buffer chamber 20 is installed side by side on one side of the drying chamber 10, and one side is in communication with the drying chamber 10 while the sludge rotates in the spiral direction by the screw 100 of the drying chamber 10. As the sludge falls in the process of being transferred, it falls to the inside of the buffer chamber 20. The lower surface of the buffer chamber 20 is made of a semi-cylindrical shape.

The cooling screw 30 is installed parallel to the screw 100 inside the buffer chamber 20 and is formed to protrude on the outer surface of the rotating shaft 31 and the rod-shaped rotating shaft 31 rotating together with the screw 100. It is provided by a plurality of flotation plates 32 to be re-injected while being transported by the screw 100 to lift the sludge dropped into the buffer chamber 20 and float inside the drying chamber 10.

The floating plates 32 of the cooling screws 30 are arranged at regular intervals in a spiral shape along the axial direction of the rotating shaft 31.

The drying unit configured as described above works as follows.

When a sludge having a large amount of moisture is introduced into the drying chamber 10 at the top of the drying unit, the sludge is sequentially transferred from the drying chamber 10 at the top to the drying chamber 10 at the bottom and heated and transferred at a high temperature to dry. However, when the sludge is sufficiently dried in the drying chamber 10 configured at the upper end and transferred into the drying chamber 10, hot air is not supplied from inside the drying chamber 10 in which the buffer chamber 20 is installed. In the state, sludge is transferred by the screw 100 of the drying chamber 10.

The sludge conveyed by the screw 100 is introduced into the buffer chamber 20 when it falls downward while being transferred while rotating spirally. At this time, while the cooling screw 30 inside the buffer chamber 20 is rotated, the flotation plate 32 is re-introduced into the drying chamber 10 while lifting and supporting the sludge upward.

As such, when the hot air is not injected into the drying chamber 10, the sludge is reciprocated to the inside of the drying chamber 10 and the buffer chamber 20, and when it is floated, the sludge is inside the drying chamber 10 and the buffer chamber 20. While being in contact with the cold air, it is gradually cooled and transferred.

Therefore, since there is no need for a facility and a process for separately cooling the high-temperature sludge discharged from the drying chamber 10, the overall configuration and process of the drying system can be reduced.

In the above, the present invention has been described in detail with reference to examples, but those skilled in the art to which the present invention pertains will be capable of various substitutions, additions, and modifications without departing from the technical spirit described above. Of course, it is to be understood that such modified embodiments also belong to the protection scope of the present invention as defined by the appended claims.

1: Drying unit 2: Circulating flow path
3: Bypass Euro 4: Dust Collector
5: deodorizer 6: first heat exchanger
7: Second heat exchanger 8: Scrubber
9: Exhaust flow path 10: Drying chamber
20: buffer chamber 30: cooling screw
31: rotating shaft 32: floating plate
100: sludge flotation screw 110: screw shaft
120: holder member 121: coupling groove
130: flotation blade

Claims (10)

A drying chamber in which a sludge flotation type screw for conveying while supporting the sludge is installed;
A circulation passage through which one end is connected to the overheated air outlet of the drying chamber and the other end is connected to one side of the drying chamber to circulate the superheated air discharged from the drying chamber and supply it into the drying chamber;
A dust collector installed on the circulation passage to collect foreign substances from superheated air flowing along the circulation passage;
A bypass flow path for guiding a part of the superheated air that is branched from the circulation flow path and passes through the dust collector;
A deodorizer installed on the bypass channel to remove odor by heating superheated air flowing along the bypass channel;
At least one heat exchanger installed at a position where the circulation flow passage and the bypass flow passage meet, to exchange heat between the superheated air flowing along the circulation flow path and the superheated air passing through the deodorizer;
An exhaust unit that cools the superheated air in the bypass passage passing through the heat exchanger and discharges the cooled gas to the outside;
A buffer chamber installed in parallel with one side of the drying chamber and communicating with one side of the drying chamber; And,
A rod-shaped rotating shaft installed parallel to the sludge flotation screw and rotating along with the sludge flotation screw inside the buffer chamber, and protruding from the outer surface of the rotation shaft to be transported by the sludge flotation screw to the inside of the buffer chamber Cooling screw having a plurality of flotation plates for re-injecting the sludge by dropping the sludge to the inside of the drying chamber;
Eco-friendly sludge drying treatment system comprising a. According to claim 1,
The sludge flotation screw,
A rod-shaped screw shaft which is installed to extend in the axial direction inside the drying chamber and rotates by the driving unit;
A plurality of holder members in a ring shape in which a hole into which the screw shaft is inserted is formed in a central portion and arranged at a distance along an axial direction on an outer surface of the screw shaft; And,
A plurality of floating blades arranged at intervals along the circumferential direction between the respective holder members;
Eco-friendly sludge drying treatment system comprising a. According to claim 2, Each of the plurality of flotation blades are eco-friendly sludge drying treatment system is installed twisted at a constant angle with respect to the axial direction of the screw shaft. According to claim 3, A plurality of flotation blades disposed between the holder member is arranged to be continuously connected to a plurality of flotation blades between neighboring holder members, each flotation blade from one end of the screw shaft to the other end An eco-friendly sludge drying treatment system arranged in a spiral twist along the axial direction. The eco-friendly sludge drying treatment system according to claim 2, wherein a plurality of coupling grooves are formed in which the end portions of the flotation blades are inserted and fixed to the holder member. The eco-friendly sludge drying treatment system of claim 2, wherein the flotation blade is a bar having an 'L'-shaped cross section. The eco-friendly sludge drying treatment system according to claim 6, wherein both ends of the plurality of floating blades are welded and fixed to a holder member. The eco-friendly sludge drying treatment system according to claim 2, wherein the center of the screw shaft is arranged at a predetermined distance eccentric from the center of the drying chamber. According to claim 1, A plurality of different drying chambers are arranged in the vertical direction on the upper side of the drying chamber, and the ends of each drying chamber are connected in a zigzag manner to sequentially sludge from the upper drying chamber to the lower drying chamber. An eco-friendly sludge drying treatment system for drying while transporting.
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