KR20020045742A - A waste water sludge drying apparatus - Google Patents

Abstract

The disclosed contents are installed horizontally and the drying object (sludge) is transported by the rotation of the spiral feed ring configured therein, while the sludge is lifted and dropped by the lifter and the impact screen to perform more complete drying. The present invention relates to a sludge drying apparatus capable of increasing the stability and durability of the apparatus due to horizontal driving.

The sludge drying apparatus of the present invention has the effect of improving the stability and durability of the device due to the horizontal driving by transferring the sludge by causing the rotation of the spiral feed ring therein by rotating and installing the horizontally without inclining the drying furnace. Has In addition, the lifter and the impact screen is installed inside the drying furnace to drop the sludge and increase the contact area with the heating gas to perform a more perfect drying to remove the smell of sludge. Accordingly, the present invention can be recycled as a cement raw material, such as crushed to remove the odor from the dried sludge is not only to reduce the cost of disposal of the sludge, it is possible to obtain economic benefits from the recycling.

Description

Sludge drying apparatus {A waste water sludge drying apparatus}

The present invention relates to an apparatus for treating and recycling sludge generated from wastewater, and in particular, by installing a drying furnace horizontally and rotating the feeder to transport a drying object (sludge) by rotating a spiral feed ring therein, while lifting a lifter. The present invention relates to a sludge drying apparatus that can raise the drying power of sludge by performing a more perfect drying by raising and dropping sludge by an impact screen and improving the stability and durability of the device due to horizontal driving.

In general, sewage sludge, that is, sewage sludge, is generated in a wastewater treatment plant and a sewage treatment plant for purifying wastewater. Since these sludges are themselves pollutants, they must be transported to the outside of the sewage treatment plant periodically for disposal. Therefore, the processing is expensive and laborious. Therefore, a plan to recycle sludge was considered. Among them, the most efficient method is to dry the sludge and use it as a cement raw material.

At this time, the sludge dryer used was an indirect heating type of a disc type or a multi-tray type. In the double disc type, a disc plate was installed in a drum, and the disc plate was heated by steam to indirectly heat-dry the sludge (sludge) attached to the disc surface. In addition, the multi-tray type was followed by a method of drying the sludge in the circumferential direction by supplying hot gas or oil to the vertical rotor.

However, the indirect heating type sludge dryer is not suitable for large capacity sludge treatment because it is suitable for small capacity facilities. In addition, the thermal efficiency was low, and maintenance had a disadvantage.

In order to solve this problem, a rotary drying apparatus of a direct drying method has been developed. This drying device is configured to dry while the drying object (sludge) is naturally transported down along the inclined surface by rotating the drying furnace inclined. Therefore, the devices for rotating the inclined drying furnace have to be designed in accordance with the inclined structure, which makes it difficult to manufacture the device, and because it is driven in an inclined state, there are frequent failures and difficult repairs. In addition, since the sludge has a viscosity, there is a problem that the dried object to be dried is not properly discharged by a slight inclined structure.

Accordingly, an object of the present invention is to devise to solve the above-mentioned drawbacks, by horizontally installing the drying furnace to drive the rotation of the spiral feed ring formed on the inner circumferential wall by the rotary drive driving the sludge propulsion transfer and the lifter and The present invention provides a sludge drying apparatus that doubles the sludge's drying power by the impact screen and improves the stability and durability of the device due to horizontal driving.

1a and 1b is a front view and a plan view of the sludge drying apparatus according to the present invention,

2 is a cross-sectional view taken along the line A-A of FIG. 1A;

3 is a schematic view for explaining the basic principle of drying the sludge in the present invention,

Figure 4 is a partial cutaway perspective view showing the structure of the drying barrel in the present invention,

5a to 5c are views showing in detail the structure of the burner in the present invention,

6a to 6c is a front view, a side view and a B enlarged detail view showing the structure of the crushing rotor in the present invention,

7a to 7c is a front view, a side view and a partially expanded detail view showing the structure of the impact screen in the present invention,

8a to 8d is a view showing a structure in which the impact screen is installed in the drying cylinder of the present invention, the B-B line, C-C line and D-D line cross-sectional view,

Figure 9 is a layout view showing the overall layout of the drying equipment is installed sludge drying apparatus of the present invention.

* Code descriptions for the main parts of the drawings

100: drying furnace 102: preheated air flow path

104: raw material inlet 106: raw material outlet

108: exhaust port 110: inner cylinder

112: spiral feed ring 114: lifter

120: outer cylinder 122: fixed outer cylinder

124: rotating outer cylinder 130: connecting cover

132a, 132b: burner fitting 134: gas guide

136: cover flange rib 138: locking jaw

140: sealing box 142: roll packing

144: support flange 200: drive means

210: driving motor 220: driving roller

230: rotating wheel 240: rotating auxiliary wheel

250: Idler 300: support plate

400: heating burner 410: waste heat inlet

500: crushing rotor 510: rotor driving motor

520: rotor shaft 530: rotor plate

600: impact screen 610: screen plate

620: screen axis 630: support rod

Sludge drying apparatus according to the present invention for achieving the above object is a device for drying the sludge generated in the wastewater, the center between the outer passage, the spiral feed ring for transporting sludge to the inner circumferential surface and the spiral feed ring It consists of a rotating inner cylinder having lifters protruding at equal intervals toward the side, and a raw material inlet for introducing sludge into the inner cylinder at one end and a raw material outlet for discharging the dried sludge to the outside at the other end. ; Drive means for rotating the drying furnace; A heating burner fixed to an outlet of the drying furnace to generate heating gas and to flow into the inner cylinder; And attaching screen plates of meshes that increase the contact area between the heating gas and the sludge on the screen shaft, and the impact screen which is fixed to the inner cylinder and integrally rotates. Include.

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

1a and 1b is a front view and a plan view of the sludge drying apparatus according to the present invention, Figure 2 is a cross-sectional view taken along the line AA of Figure 1a, Figure 3 is a schematic diagram for explaining the basic principle of drying the sludge in the present invention, Figure 4 is a partial cutaway perspective view showing the structure of the drying barrel in the present invention.

As shown, the present invention consists of an inner cylinder 110 which is dried while the raw sludge is transported, and an outer cylinder 120 fixed to the outside of the inner cylinder 110 to form a preheated air flow path 102 therebetween. The drying furnace 100 is provided. In particular, the drying furnace 100 is fixed to the outer cylinder portion of the front end of the raw material inlet 104 is fixed to form a fixed outer cylinder portion 122, and connected to form a rotary outer cylinder portion 124 toward the rear half. The rotary outer cylinder 124 is coupled to the inner cylinder 110, and is driven to rotate by the drive means (200). Of course, the drying furnace 100 is fixed to the support plate 300, the driving means 200 is located above the support plate 300. The driving means 200 is fixed to the outer peripheral surface of the drive motor 210, the drive roller 220 rotated by the drive motor 210, and the rotary outer cylinder portion 124 rotated in close contact with the drive roller 220 The rotary wheel 230 is configured. In particular, the pair of driving roller 220 is configured to be in close contact with both sides of the rotary wheel 230 to drive the rotary wheel 230 to rotate the rotary outer cylinder 124 and the inner cylinder 110 fixed thereto. Of course, the inner cylinder 110 is separated from the fixed outer cylinder portion 122 is the portion entered into the fixed outer cylinder portion 122, only the portion located in the rotating outer cylinder portion 124 connecting plate fixed in the axial direction to the outer surface portion (Not shown) are combined and integrated. Therefore, when the rotary outer cylinder 124 is rotated, the inner cylinder 110 is rotated as a whole, so that the portion entered into the fixed outer cylinder 122 is also rotated therein. The rotary outer cylinder 124 is also fixed to the rotary auxiliary wheels 240 at regular intervals from the rotary wheels 230, it is in close contact with the idler (Idler 250) to smoothly guide the rotation of the rotary outer cylinder 124 ) Is fixed on the support plate 300.

In the present invention, the raw material inlet 104 is provided at one end of the drying furnace 100, and the heating burner 400 is provided at the opposite end thereof. The heating burner 400 is coupled to the drying furnace 100 via the connection cover 130, and supplies the heating gas into the drying furnace 100 (in particular, the inner cylinder) through the connection cover 130. Of course, the connection cover 130 is fixed on the support plate 300, the engaging portion with the rotary outer cylinder portion 124 is to prevent leakage of the heating gas during the rotation of the rotary outer cylinder portion 124 and to maintain the airtight. . This part will be described in detail later with reference to FIGS. 5A to 5C. On the other hand, the preheating gas flow path 102 formed between the outer cylinder 120 and the inner cylinder 110 described above is connected to the cover as shown in FIG. 130 is connected to the inner cylinder 110 at the connection portion, and thus the preheated gas introduced into the outer cylinder 120 near the raw material inlet 104 flows toward the connection cover 130 along the preheating gas flow path 102. The inner cylinder 110 is preheated / cooled to a predetermined temperature and at the same time comes into the connection cover 130 and is heated by the heating burner 400 to be introduced into the inner cylinder 110 together with the heating gas flowing into the connection cover 130. To further increase the speed of drying of the raw materials.

In the inner surface portion of the inner cylinder 110 of the drying furnace 100 as shown in FIG. 4, the spiral feed ring 112 for pushing the raw materials toward the outlet 106 is spirally discharged from the inlet 104 toward the outlet 106. To the side. Then, the lifters 114 are mounted and fixed at equal intervals between the spiral feed rings 112 so as to mount the raw materials, and rotate and rise and fall. As shown in FIG. 4, the lifter 114 is fixed inclined slightly downward toward the inlet 104, and the inner end thereof is bent in the rotational direction, and is shaped to fall after lifting about 70-80 ° with the raw material.

The apparatus is also equipped with a crushing rotor 500 for pulverizing and supplying the raw materials introduced to the raw material input port 104 side of the inner cylinder (110). The crushing rotor 500 is driven by the rotor shaft 520 is rotated by the rotor drive motor 510 installed outside the drying furnace 100, the rotor plate 530 mounted on the rotor shaft 520 rotates Let's go. The rotor plate 530 is fixed to the rotor shaft 520 inclined in consideration of the raw material transfer direction, a detailed description thereof will be described in Figures 6a to 6c.

In the middle portion of the inner cylinder 110, the impact screen 600 is also installed. The impact screen 600 is spaced apart from the crushing rotor 500 by a predetermined interval, and starts from the position where the rotary outer cylinder portion 124 starts, and is fixed inside the inner cylinder 110 to rotate integrally. The impact screen 600 is formed of a mesh of the screen plate 610, the raw materials falling from the lifter 114 is impacted by the impact of falling as it is finely pulverized and at the same time good ventilation and heating gas is more large area and It makes contact with and raises drying efficiency. A detailed description of this structure will be given later with reference to FIGS. 7A to 8D.

In addition, in the drying furnace 100, an exhaust port 108 through which heating gas is exhausted is provided near the raw material inlet 104, and a raw material outlet 106 through which the dried raw material is discharged is installed below the connection cover 130. It is. The heat burner 400 has a waste heat inlet 410 for utilizing waste heat obtained by burning waste tires.

Figures 5a to 5c is a view showing in detail the structure of the burner in the present invention, Figure 5a is a partial detailed cross-sectional view of the burner connecting portion from the front, Figure 5b is a right side view thereof, Figure 5c is a view of Figure 5a This is part A.

As shown in the drawing, the connection cover 130 is provided with burner mounting holes 132a and 132b to which a pair of heating burners (not shown) are mounted, and is mounted on the left and right pair of burner mounting holes 132a and 132b. One of the pair of heating burners is a BC oil burner and the other is a vaporizer burner. In this way, the connection cover 130 to which the heating burners are connected is formed with a gas guide path 134 for guiding the heating gas of the burner therein, and at the inner end thereof, a raw material outlet 106 for discharging the raw material dried downward. ) Is provided. Of course, the inner end is connected to the end of the rotating drying furnace 100, for this purpose, the connecting portion of the drying furnace 100 is provided with a sealing box 140 as shown in Figure 5c and the connection cover 130 therein Cover flange rib (136) of () is inserted. In addition, at the end of the cover flange rib 136 and the connection cover 130 adjacent to each other, the locking jaw 138 protrudes, and the roll packing 142 is interposed between the sealing box 140 and the sealing box 140. Thus, the connection cover 130 and the drying furnace 100 can be kept tight to prevent the leakage of the heating gas to the outside during the rotation of the drying furnace (100). Furthermore, the support box rib 144 is formed at the end of the drying furnace in the sealing box 140 of the drying furnace 100 to support the end of the connection cover 130 to reduce friction during rotation to enable smooth rotation. .

6a to 6c is a front view, a side view and an enlarged portion B detail showing the structure of the crushing rotor in the present invention.

The shredding rotor 500 is composed of a rotor plate 530 fixed to the rotor shaft 520 at predetermined intervals along the rotation direction. In this embodiment, the rotor plate 530 is attached to the rotor shaft 520 at intervals of 90 °, so that four rotor plates 530 are fixed at equal intervals along the circumferential direction at one point of the rotor shaft 520. Will be. At this time, the rotor plate 530 is inclined along the axial direction as shown in Figure 6a is attached to the rotor shaft 520, the rotor plate 530a fixed to the next point of the rotor shaft 520 is the rotor plate of the battery point Staggered with (530). Therefore, the rotor plates 530, 530a, ... attached to each of the four points at equal intervals in the longitudinal direction to the rotor shaft 520 have a structure similar to a screw when viewed in the axial direction as a whole. Accordingly, the rotor plates 530, 530a,... Are rotated while pushing the raw sludge injected like a screw toward the outlet.

7a to 7c is a front view, a side view and a partially enlarged detail view showing the structure of the impact screen in the present invention, Figures 8a to 8d is a view showing a structure in which the impact screen is installed in the drying barrel of the present invention; The BB line, CC line, and DD line cross-sectional views are shown.

In the present invention, the impact screen 600 has a dual function of receiving the sludge raised and dropped by the lifter 114, and drying and dropping again to crush the sludge, thus the sludge to be dried is more uniformly crushed. At the same time, the dry state becomes good.

The impact screen 600 has screen plates 610 attached to the screen shaft 620 every 90 degrees along the circumferential direction. Accordingly, four screen plates 610 are fixed at one point of the screen axis 620 in the circumferential direction, and the screen plates 610, 610 a,... Which are adjacent to each other in the axial direction are alternately arranged on the screen axis 610. It is fixed and appears to be eight when viewed from the side as shown in FIG. 7B. In addition, the screen plates 610, 610a, ... are not only fixed inclined slightly in the axial direction, but are also folded in the rotational direction in accordance with the rotation in the top vertical position, so that the screen shaft 620 can be dropped. It is fixed to pivot only in the rotational direction in the phase. These screen plates 610, 610a, ... to increase the drying efficiency by inducing the heating gas in contact with a larger area of the sludge.

The shock screen 600 as described above is to be integrally rotated with the inner cylinder 110, for this purpose, the support rods 630 are fixed to the screen shaft 620 perpendicular to the screen shaft by fixing the outer end to the inner cylinder circumferential wall 620 is spaced apart from the inner cylinder wall to support it. Four supporting rods 630 are fixed at one point of the screen shaft 620 every 90 ° along the circumferential direction, and they are again installed at regular intervals in the axial direction so that the screen shaft 620 is positioned on the center of the inner cylinder 110. It is fixed at.

9 is a layout view showing the overall layout of the drying equipment is installed sludge drying apparatus of the present invention.

In this apparatus, the sludge to be dried is transferred and supplied by the raw material supply system 10. The raw material supply system 10 is supplied to the sludge storage container 15 through the screw conveyors 12 and 13 and the angle conveyor 14 for transporting the sludge dropped from the sludge feed hopper 11 horizontally and upwardly. When the device is in operation, it is again conveyed by the screw conveyor 16 and the angle conveyor 17 or the like to be introduced into the raw material inlet 104 of the device.

On the other hand, as described above, the apparatus is provided with two heating burners 400, one of which uses B.C oil or light oil and the other uses dry gas produced in a waste tire vaporizer as a raw material. Therefore, the fuel supply system 20 which supplies fuel to this apparatus is designed in a drying facility. The fuel supply system 20 has a BC oil tank 21 in which BC oil is stored and a diesel oil tank 22 in which diesel oil is stored. The fuel supply system 20 includes a gear pump 23 and the BC oil tank 21 and diesel oil tank. The fuel is supplied to the heating burner 400 from (22). At this time, in order to increase the efficiency of the heating burner 400, dry gas is introduced from the outside through the waste heat inlet 410. For this purpose, a waste heat generation system 30 for making dry gas by recycling waste tires is provided in the drying facility. It is provided. The waste heat generation system 30 transfers the waste tires fed from the waste tire input hopper 31 to the two-way chute 34 by using an angle conveyor 33 and supplies them to the vaporizer 35 at low temperature pyrolysis. To produce dry gas. The produced dry gas is introduced into the waste heat inlet 410 of the heating burners 400 to accelerate the production of the heating gas. On the other hand, the ash of the waste tire burnt in the vaporizer 35 is carried out to the outside by the re-export conveyor 36.

On the other hand, the hot gas (exhaust gas) used and exhausted in the apparatus is purged and discharged to the outside, and is used to recover the heat during the purge treatment to make preheating gas. That is, in the drying facility, the purifying system 40 also serves as a preheating gas manufacturing function, in which the waste hot gas exhausted from the apparatus is burned in the secondary combustor 42 via the cyclone 41 and the secondary combustor ( The preheating air is made by heating fresh air by a heat exchanger (not shown) provided in 42). The preheating air thus made is supplied to a preheating air flow path (not shown) formed between the outer cylinder and the inner cylinder of the apparatus, thereby preheating the drying furnace 100 to increase the drying efficiency. On the other hand, the waste high temperature gas re-burned in the secondary burner 42 is sprayed with water in the dust treatment unit 43 to remove harmful dust, passing through the activated carbon of the harmful gas remover 44, the harmful gas is completely purified It is discharged to the outside through the discharge fan 45.

The drying facility is also equipped with a loading system 60 for loading the vehicle 50 to transport dry sludge discharged from the raw material outlet 106 to the required place. The stacking system 60 moves the sludge discharged to the screw conveyor 61 horizontally, vertically pumps it up into the bucket elevator 62, stores it in the silo 63, and the discharge plate (if necessary). 64 is opened and loaded into the vehicle 50.

Now, the operation of the sludge drying apparatus will be described in detail with reference to the aforementioned conductive surfaces.

When the raw material (sludge) is put into the drying furnace 100, the drive motor 210 is rotated to rotate the rotary outer cylinder 120. Then, the inner cylinder 110 coupled thereto is rotated, and the heating burners 400 are also ignited to send the heating gas into the inner cylinder 110. The heated gas that passes through the inner cylinder 110 and heat-dried the sludge is exhausted to generate a preheated gas in the secondary combustor 42 and flows into the preheated gas flow path 102 formed between the outer cylinder 120 and the inner cylinder 110. While flowing, the inner cylinder 110 is pre-cooled to a predetermined temperature.

On the other hand, the sludge injected into the inner cylinder 110 through the raw material inlet 104 is crushed while the crushing rotor 500 at the front end of the inner cylinder 110 rotates. At this time, the sludge is rotated while the rotor plate 530 of the crushing rotor 500 is applied while being crushed so as to protrude outward by centrifugal force. The sludge crushed to some extent by the crushing rotor 500 is moved to the discharge port 106 by the spiral spiral feed ring 112 formed over the entire inner section of the inner cylinder 110 as the inner cylinder 110 rotates. Since the lifter 114 protrudes toward the center of the inner cylinder 110 in the spiral feed ring 112, the sludges are loaded on the upper portion thereof and are raised by the rotation of the inner cylinder 110. It will fall at 114. The sludge dropped in this way falls on the impact screen 600, is crushed more finely, and comes into contact with the heating gas to be dried. In particular, since the impact screen 600 is attached to the screen plate 610 of a plurality of meshes in the form of a wing, the lifting gas is broken down here in the lifter 114 at the same time the heating gas is the top of the screen plate 610 Of course, the lower part is in contact with the sludge, thus increasing the drying speed of the sludge and improving the dry state. Since the screen plate 610 is also fixed to the inner cylinder 110, the sludge loaded thereon is lifted up and comes to the vertical top point, so that the sludge loaded thereon falls down due to gravity in the rotational direction. Accordingly, the sludge is crushed by falling off the inner wall of the inner cylinder (110), and is carried on the spiral feed ring 112 of the inner wall and the lifter 114 protruding at equal intervals to be continuously transported toward the outlet (106) to be dried. Thus completely dried sludge reaches the raw material outlet 106 formed in the connecting cover 130 is discharged to the outside through there.

As described above, the sludge drying apparatus of the present invention has an effect that can be installed horizontally without inclining the dryer to transfer the sludge by the rotation of the spiral feed ring to improve the stability and durability of the device due to the horizontal driving. In addition, the lifter and the impact screen is installed inside the drying furnace to drop the sludge and increase the contact area with the heating gas to perform a more perfect drying to remove the smell of sludge. In addition, fuel costs can be reduced because dry tires are produced using waste tires. Accordingly, the present invention can be used to recycle the dried sludge crushed to a certain size to remove the odor as a cement raw material, so as not only reduce the cost of disposal of the sludge, but also obtain the economic benefits of recycling. There is this.

Claims (12)

In the apparatus for drying the sludge generated from the wastewater, It consists of an outer cylinder, a spiral feeder for transporting sludge to the inner circumferential surface, and an inner cylinder that is rotated and provided with lifters protruding at equal intervals toward the center at intervals between the spiral feeder, and injecting sludge into the inner cylinder at one end. A drying furnace in which an inlet is formed and a raw material outlet for discharging the dried sludge to the outside is formed; Drive means for rotating the drying furnace; A heating burner fixed to an outlet of the drying furnace to generate heating gas and to flow into the inner cylinder; And And a shock screen which is attached to the screen shaft by attaching screen plates of meshes that increase the contact area between the heated gas and the sludge while simultaneously collapsing and grinding the sludge that is lifted and dropped by the lifter. Sludge drying device. According to claim 1, It is installed in the inner cylinder of the drying furnace while rotating the crushing rotor for crushing and supplying the sludge injected through the raw material inlet, and a rotor driving motor fixed to the outside of the drying furnace to drive the crushing rotor Sludge drying device included. According to claim 1, wherein the outer cylinder is fixed to the ground and the raw material inlet is formed, and the outer cylinder portion is connected to the fixed outer cylinder portion while the inner cylinder is fixed to the inside and rotated by the drive means that the outer cylinder portion Sludge drying apparatus characterized by the above-mentioned. According to claim 1 or 3, wherein the drive means comprises a drive motor, a drive roller rotated by the drive motor, and a rotating wheel fixed to the outer peripheral surface of the rotary outer cylinder portion in close contact with the drive roller is rotated Sludge drying apparatus, characterized in that. The sludge drying apparatus according to claim 1, wherein the lifter is inclined downward toward the raw material inlet and the inner end is bent in a predetermined direction in a rotational direction. According to claim 1, wherein the impact screen is the screen shaft is fixed to the inner cylinder circumferential wall with the support rods, the screen plate is fixed at four points spaced 90 degrees along the circumferential direction at one point of the screen axis and in the axial direction The sludge drying apparatus, characterized in that the staggered arranged at regular intervals. According to claim 2, wherein the crushing rotor is connected to the rotor drive motor and the rotor shaft, the four are fixed at equal intervals every 90 degrees along the circumferential direction to the rotor shaft while being spaced a predetermined distance along the axial direction Sludge drying apparatus characterized in that it comprises a rotor plate alternately arranged. According to claim 1, The burner is provided between the drying furnace and the heating burner, the burner mounting holes are formed on which the pair of heating burners are mounted while the inner end portion is provided with the raw material outlet for discharging the dried material downward Sludge drying apparatus comprising a connection cover. The method of claim 8, wherein the connection portion of the drying furnace coupled to the connection cover is provided with a sealing box formed with a support flange rib for supporting the end of the connection cover, the cover flange rib of the connection cover is inserted therein, the cover A sludge drying device protrudes from an end of the connection cover adjacent to the flange rib so that the roll packing is interposed between the sealing boxes to maintain airtightness. The sludge drying apparatus according to claim 1, further comprising a waste heat generation system for producing dry gas using waste tires. 11. The waste heat generating system according to claim 10, wherein the waste heat generating system is formed of a waste tire feed hopper, a vaporizer for low temperature pyrolysis of the waste tire, and waste tire feed means for transferring the waste tire from the waste tire feed hopper to the vaporizer. Sludge drying device. The sludge drying apparatus according to claim 11, wherein said waste tire transfer means is a conveyor.