KR100551928B1 - A dry apparatus of sewage/wastewater sludge and an equipment having the same - Google Patents

Abstract

The present disclosure relates to a sewage and wastewater sludge drying apparatus for pulverizing and discharging sewage and wastewater sludge which is dried while hot air drying by inputting sewage and wastewater sludge in a rotary drying furnace at a size and moisture content suitable for recycling, and a drying facility using the same. The present invention is a crane for supplying sewage and wastewater sludge by an appropriate amount; A hopper for feeding the sewage and wastewater sludge supplied to the crane by a predetermined amount; Quicklime injection means for supplying a small amount of quicklime; A spiral feeder that is helically attached to an inner surface and transports the mixed sludge mixture through the hopper and the quicklime feeding means, and a lifter disposed in a circumferential direction between the spiral feed rings to load and raise the sludge mixture and to drop the sludge mixture; It is disposed in a certain area near the sludge inlet, and has a porous net for crushing and loading and drying the sludge mixture dropped from the lifter, and a rotary drying furnace for discharging the sludge mixture introduced through the inlet through hot air to discharge it to the dry sludge through the outlet. ; Hot air providing means for providing hot air for drying sewage and wastewater sludge in the rotary drying furnace; And rotary driving means for rotating the rotary drying furnace.

Sewage & Wastewater Sludge, Wastewater Sludge, Sludge Dryer, Purifier, Rotary Drying Furnace

Description

Sewage and Sewage Sludge Dryer and Drying Equipment Applying the Same {A DRY APPARATUS OF SEWAGE / WASTEWATER SLUDGE AND AN EQUIPMENT HAVING THE SAME}

Detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, in which numerals designate corresponding parts in the drawings.

1 is a view showing the overall structure of the sewage, wastewater sludge drying apparatus according to the present invention,

2a to 2c are views showing the structure of the drying furnace shown in FIG.

3 is a partial cutaway perspective view showing in detail the components attached to the inner surface of the drying furnace shown in Figure 2a,

4 is a view schematically showing a spiral feed ring configured on an inner surface of a drying furnace,

5A to 5D are cross-sectional views taken along lines A-A, B-B, C-C and D-D of FIG. 4,

Figure 6 is a perspective view showing in detail the configuration of the porous network shown in Figure 2a,

7a and 7b is a view showing the front part of the drying furnace is installed porous mesh and E-E cross-sectional view,

8 is a layout diagram of a drying facility to which the sewage and wastewater sludge drying apparatus shown in FIG. 1 according to the present invention is applied,

9 is a flowchart showing an operation process of the present drying apparatus,

10A and 10B are flowcharts sequentially showing the overall process of the sewage and wastewater sludge drying equipment according to the present invention.

** Explanation of symbols for main parts of drawings **

100: drying apparatus 110: drying furnace

112: inlet 114: outer cylinder

116: inner cylinder 118: outlet

120: sludge injection means 122: storage room

124: crane 126: hopper

128: conveying screw conveyor 130: quicklime injection means

140: support plate 150: rotation drive means

152: driving motor 154: driving roller

156: rotation wheel 160: hot air providing means

170: porous network 180: spiral transfer ring

182: lifter 200: secondary drying device

210: secondary drying furnace 212: sludge inlet

214: sludge outlet 220: waste storage room

230: waste incinerator 240: gantry crane

250: drag chain conveyor 300: cyclone

310: heat exchanger 320: bag filter

330: noxious gas treatment device 332: slaked lime injection device

334: activated carbon spraying device 340: wet cleaning device

350: fan 360: white smoke treatment equipment

370: chimney

The present invention relates to a device for treating and recycling sludge (hereinafter, referred to as sewage sludge) generated in sewage and wastewater, and more specifically, sewage sludge which is dried while hot air is dried by putting sewage sludge into a rotary drying furnace. The present invention relates to a sewage sludge drying apparatus for pulverizing and discharging water at a size and moisture content suitable for recycling, and a drying equipment using the same.

In general, the generation of household sewage and industrial wastewater has also increased greatly for various reasons such as economic development, population growth, and improved living standards. Accordingly, in order to prevent water pollution of major rivers and rivers, the facilities of sewage and wastewater treatment facilities, which are the basic facilities for water quality improvement, are also inevitably increasing, and the amount of sewage and wastewater sludge, which is a secondary by-product of incidental water, is gradually increasing. .

Most of the sewage sludge produced is treated by landfill and dumping at sea. However, in the case of simple landfill, from July 2003, direct reclamation of sewage treatment plant sludge with a capacity of more than 10,000 tons / day has been prohibited due to the revision of the Waste Management Act Enforcement Rule.

Accordingly, the proportion of marine dumping is increasing, but in this case, there is a concern that it may cause pollution of the marine ecosystem, such as eutrophication due to excessive organic substances, algae growth and oxygen depletion due to red tide occurrence in which a large amount of vegetable nutrients are introduced. Korea entered into the London Convention, the international treaty on the prohibition of waste dumping on December 21, 1993 and entered into force on January 19, 1994. In particular, the government plans to ratify the 1996 amendment to the end of 2003. The government plans to prohibit ocean dumping within the next two years by tightening regulations such as changing the standard test method for dumping at sea from the current dissolution test to the content test.

In addition, incineration, which is considered as a sludge treatment method, has a problem of air pollution due to generation of secondary environmental pollutants as well as high incineration facility construction and operation costs. As a result, many civil complaints of neighboring residents have occurred, which is very difficult to apply.

Therefore, the sewage sludge treatment method is urgently required to actively recycle beyond the simple treatment stage, such as landfill, ocean dumping, incineration. The recycling of sewage sludge has a plan to be used as a raw material of fertilizer, fuel and cement, for which the development of a drying apparatus for drying sewage sludge should be preceded.

 Accordingly, an object of the present invention is to devise to solve the above-mentioned defects and to meet the expectations, and transfer the drying object (sludge) by rotating the spiral feed ring therein by horizontally installing and rotating the drying furnace. On the other hand, the sludge is raised and dropped by the lifter and the porous net to increase the contact area and contact time with the hot wind, and a small amount of quicklime is mixed in the sludge during drying to increase the drying efficiency and improve the hygiene. To provide a drying apparatus.

Another object of the present invention is to install the sewage sludge drying device in a double to carry out the drying over a second while transporting and storing the sludge discharged to be suitable for transport and use, the exhaust gas of the drying device discharged during the drying process It is to provide a sewage sludge drying facility that is purified and discharged through a plurality of purification devices harmless to the environment.

Sewage sludge drying apparatus according to the present invention for achieving the above object is a crane for supplying sewage sludge by an appropriate amount; A hopper for feeding a predetermined amount of sewage sludge supplied to the crane; Quicklime injection means for supplying a small amount of quicklime; A spiral feeder that is helically attached to an inner wall to transfer the mixed sludge mixture through the hopper and the quicklime feeding means, and a lifter disposed along the circumferential direction between the spiral feed ring to load and raise the sludge mixture and to drop the sludge mixture; The sludge mixture is supported at a predetermined interval near the sludge inlet to be spaced apart from the inner wall, and has a porous mesh for crushing and loading and drying the sludge mixture dropped from the lifter. The sludge mixture introduced through the inlet is rotated horizontally. A rotary drying furnace for hot air drying to discharge the dry sludge through the outlet; Hot air providing means for providing hot air for drying the sewage sludge in the rotary drying furnace; And rotary driving means for rotating the rotary drying furnace.

The sewage sludge drying facility according to the present invention for achieving the above object is a gantry crane for supplying the sewage sludge, the hopper for supplying while controlling the amount of sewage sludge supplied to the gantry crane, and the sewage sludge injected from the hopper A primary drying apparatus having a rotary primary drying furnace for drying hot air while being transported by rotation; A secondary drying apparatus having a secondary drying furnace for drying the dry sludge supplied from the primary drying furnace and a waste incinerator for providing hot air to the secondary drying furnace; And an exhaust gas purifying apparatus for purifying the exhaust gas discharged after drying the sewage sludge and discharging it into the atmosphere.

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

1 is a view showing the overall structure of the sewage sludge drying apparatus according to the present invention. 2a to 2c are views showing the structure of the drying furnace shown in Figure 1, respectively, a front view, a side cross-sectional view and a plan view.

The drying apparatus 100 is a drying furnace 110 for drying the sewage sludge 10 by high temperature hot air as shown, and a sludge input for storing and storing the sludge 10 and supplying it to the drying furnace 110 by a predetermined amount. Means 120 are provided.

The sludge feeding means 120 is a storage chamber 122 for storing and storing the sludge 10 and a crane 124 installed in the storage chamber 122 to traverse and supply the sludge 10 stored in the storage chamber 122 by a predetermined amount. And an input hopper 126 which is installed at the inlet 112 of the drying furnace 110 and injects the sludge 10 supplied by the crane 124 into the drying furnace 110 by appropriate amounts. The feed hopper 126 is made of a small hopper with a capacity of about 3.5 tons. The lower portion of the input hopper 126 is equipped with a conveying screw conveyor 128 is to supply the appropriate amount of sludge into the drying furnace (110). The screw drive motor of the transfer screw conveyor 128 is equipped with an inverter to control the rotational speed of the transfer screw to adjust the amount of sludge 10 supplied to the drying furnace 110 according to the processing condition of the drying furnace 110. Done. A small amount of quicklime is also added to the drying furnace 110 along with the input of the sludge 10. To this end, the quicklime injection means 130 is provided at a portion adjacent to the inlet 112 or the inlet 112 of the drying furnace 110. Quicklime injection means 130 may be directly connected to the inlet 112 of the drying furnace 110, or may be connected to the transfer screw conveyor 128 for transporting the sludge 10. The quicklime input means 130 may be configured by applying a storage hopper for quicklime input or a conveying screw conveyor capable of supplying the quicklime by a predetermined amount in the same manner as the sludge input structure. The crane 124 described above is preferably a gantry type crane.

The drying furnace 110 has a double case structure of the outer cylinder 114 and the inner cylinder 116, and both ends of the outer cylinder 114 are fixed to the bottom. In addition, a space is formed between the outer cylinder 114 and the inner cylinder 116 and is used as a passage through which hot air moves. Specifically, both ends of the outer cylinder 114 is fixed to the support plate 140, the middle portion thereof is integrally coupled with the inner cylinder 116. Accordingly, the outer cylinder 114 is located between the fixed cylinder portions 114a and 114b at both ends and the intermediate rotary drive cylinder portion which is located between the fixed cylinder portions 114a and 114b and coalesced with the fixed cylinder portions to form the outer cylinder 114. 114c). The apparatus includes a rotation driving means 150 for rotating the drying furnace 110. The rotary drive means 150 is in close contact with the drive motor 152 seated on the support plate 140, the drive roller 154 rotated by the drive of the drive motor 152, and the drive roller 154 to rotate. It consists of a rotary wheel 156 fixed to the outer circumferential surface of the rotary drive cylinder 114c.

One end of the drying furnace 110 is configured with the above-described inlet 112, the other end is equipped with hot air providing means 160. The hot air providing means 160 may be a burner as in the present embodiment or a waste incinerator to be described later. As the fuel of the burner, light oil, bunker seed oil and the like are used, and at the same time, a hot gas inlet 162 for injecting a heat source such as hot gas supplied from the outside is provided adjacent to the burner mounting portion. Reference numeral 164 connected to the burner denotes an oil tank.

The drying furnace 110 is also provided with a sludge discharge port 118 for discharging the dried sludge, the sludge discharge port 118 is preferably configured at the end of the drying furnace 100 opposite the sludge inlet 112. Do. Further, the sludge inlet 112 is preferably formed in the drying furnace 110 in the upward direction and the sludge outlet 118 is formed in the drying furnace 110 facing downward.

As described above, the drying furnace 110 may be configured as a single cylinder structure instead of a dual structure of the inner and outer cylinders as illustrated. . In this way, the drying furnace may be a structure in which both ends are fixed and rotate horizontally, whether in a double cylinder structure or a single cylinder structure.

In the drying furnace 100, the porous net 170 is fixed near the inlet 112, and an inner surface of the inner cylinder 116 is provided with a spiral spiral feed ring 180 over the entire span, and a spiral feed ring 180. Lifters (not shown) are attached between. The spiral feed ring 180 generates thrust to push (transfer) the internal sludge toward the outlet 118 according to the rotation of the inner cylinder 116, and the lifters load the sludge 10 when the inner cylinder 116 rotates. Ascending and falling from above, the sludge is crushed to a certain size. In particular, the inner end of the lifter is bent in the rotational direction so that the sludge loaded thereon falls at a position of about 70 to 80 kPa. In the front part of the drying furnace 110, the sludge is introduced into the sludge because a lot of water is present, the porous network 170 is located in order to crush the sludge small and further increase the drying effect. As a result, the sludge falling from the lifter collides with the porous network 170 to improve the crushability of the sludge and at the same time, the sludge 10 loaded on the mesh has more area in contact with hot air, thereby increasing the dryness. The structure of the lifter and the porous network 170 will be described in more detail with reference to FIGS. 3 to 7B.

3 is a partial cutaway perspective view showing in detail the components attached to the inner surface of the drying furnace shown in Figure 2a. 4 is a diagram schematically showing a spiral feed ring formed on the inner surface of the drying furnace, and FIGS. 5A to 5D show cross-sectional views taken along line A-A, line B-B, line C-C and line D-D of FIG. 4, respectively.

An spiral spiral feed ring 180 is attached to an inner surface of the inner cylinder 116 of the drying furnace 110. The spiral feed ring 180 has a structure wound in a direction in which the sludge can be pushed toward the sludge discharge port as it rotates. Further, the inner cylinder 116 having the spiral feed ring 180 is formed to be slanted to have a high sludge inlet side and a sludge outlet side to be inclined so that sludge flows naturally toward the outlet side. In more detail, the outer cylinder 114 has the same diameter in the front and rear, while the inner cylinder 116 fitted therein is configured to be inclined downward while widening from the front to the rear.

In addition, a lifter 182 for freely dropping the sludge to increase the crushing effect between the spiral feed ring 180 is provided at 45 ㅀ intervals along the circumferential direction. Therefore, the lifters 182 arranged in this way are arranged toward the center of the cylindrical inner cylinder 116, and a portion of the end thereof is bent upward, and the sludge loaded thereon is designed to fall at about 150 kPa from the lowest point. . The lifter 182 plays a role of conveying the sludge together with the spiral feed ring 180, and simultaneously lifts the sludge to an angle of about 150 ㅀ. As a result, the falling sludge is crushed by the collision between the bottom of the inner cylinder 116 and the lifter to uniformize the particle size within 10 mm, and the drying of the sludge is accelerated by the hot air flowing during the falling.

6 is a perspective view showing in detail the configuration of the porous network shown in Figure 2a. In addition, Figure 7a is a view showing the front part by drying the porous mesh is installed, Figure 7b is a cross-sectional view taken along the line E-E of Figure 7a. In particular, reference numeral 180 shown by a dashed-dotted line while reciprocating the upper and lower sides of the inner cylinder in FIG. 7A schematically shows the spiral feed ring.

The sludge supplied to the inlet is contained in water and then aggregated into lumps. Porous nets 170 are installed at the front of the drying furnace 110 to quickly and uniformly crush the sludge masses, while drying proceeds quickly. To be. In more detail, the porous nets 170 are fixed to the front portion adjacent to the inlet of the inner barrel 116 of the drying furnace along a plurality of longitudinal directions. In the present embodiment, four porous meshes 170 are connected and each of them has a body plate 174 attached to the outer circumferential surface of the support shaft 172 as shown in FIG. 6. At least two body plates 174 are attached to the support shaft 172, and preferably, four body plates 174 are disposed at 90 ° intervals along the circumferential direction. That is, the porous network 170 is configured by adjoining the unit networks consisting of four body plates 174 on one support shaft 172, the plate plates of the neighboring unit meshes and the body plates of the front and rear unit network Are staggered. Therefore, when viewed from the side, as shown in FIG. 7B, the rear plates are also seen, so that eight plates 174 are visible. Porous nets 170 of such a structure is installed by fixing the front and rear to the inner cylinder 116 with the support (176). As a result, the porous network 170 is rotated together with the rotation of the inner cylinder (116). In order to double the fixing force of the porous nets 170, it is preferable to fix the front and rear of each unit nets with the supports 176.

The porous network 170 described above is preferably installed from the inlet to the 1/3 point of the whole section of the drying furnace 110, the spacing of the body is designed to about 25mm, the above-described spiral feed ring 180 and the lifter 182 Sludge is raised and dropped by the blow to the porous network 170, some of them pass through the mesh to be crushed to the size of the body to express the internal moisture, the rest is loaded on the mesh and rotated to maximize the residence time in the air Lengthen to maximize contact efficiency with hot air.

8 is a layout view of a drying facility to which the sewage sludge drying apparatus shown in FIG. 1 according to the present invention is applied.

This embodiment is an ideal layout (lay-out) of the drying equipment to which the above-described drying apparatus is applied, wherein the above-mentioned drying apparatus 100 is used as the primary drying apparatus. The dry sludge dried and discharged from the above-described drying apparatus 100 may be used as cement or various raw materials, but when the drying process is performed once more as in this embodiment, a better and more uniform dry sludge may be obtained. Therefore, the sludge dried in the primary drying device 100 passes through the roller mill 119 provided in the sludge discharge port 118 of the primary drying furnace 110 as it is, and more than that is compressed 2 It is sent to the car drying apparatus (200). For example, if the passage allowance value of the roller mill 119 is 10 mm, the one exceeding 10 mm that passes through as it is 10 mm or less is compressed and the internal moisture is expressed and sent to the secondary drying apparatus 200. In the secondary drying apparatus 200, a waste heat recovery apparatus which obtains a drying heat source while burning and treating combustible wastes (garbage) is used. The waste heat thus obtained is introduced into the secondary drying furnace 210 and the primary drying apparatus 100 is used. The sludge supplied from is dried again. To this end, the secondary drying apparatus 200 is a waste storage chamber 220 for storing the waste 20, and a gantry crane for supplying a waste amount of the waste 20 in the waste storage chamber 220 to the waste incinerator 230 ( 240 and a waste incinerator 230 for injecting hot air to the secondary drying furnace 210 by incineration of the waste 20 supplied from the gantry crane 240 through the hopper 232. Sludge inlet 212 is formed in the secondary drying furnace 210, the drag chain conveyor (250) is connected to the sludge inlet 212, the sludge supplied from the primary drying furnace 110 Into the sludge inlet 212 of the secondary drying furnace 210. The sludge which has been dried in the secondary drying furnace 210 is discharged through the sludge discharge port 214, in which the air transport means 216 is connected to the sludge discharge port 214, the air transport and the drag chain The conveyor 260 transports and stores the arm roll box 262. The dry sludge stored in the arm roll box 262 is transported to a place requiring dry sludge using the arm roll truck 264. In addition, the ash of the waste 20 incinerated in the waste incinerator 230 of the secondary drying apparatus 200 is stored in the arm roll box 272 through the conveyor 270 and discarded using the arm roll truck 274. . Furthermore, the hot air from the sludge drying in the secondary drying furnace 210 is recovered again and introduced into the primary drying furnace 110. As such, the primary drying furnace 110 may reduce fuel consumption by recovering and reusing the waste heat of the secondary drying furnace 210.

In addition, the drying facility is provided with an exhaust gas purifying apparatus for purifying the hot air (hereinafter referred to as exhaust gas) discharged after drying the sludge 10 in the primary drying furnace (110). First, a cyclone 300 is installed to separate particulate matter contained in the exhaust gas discharged from the primary drying furnace 110. The cyclone 300 is a device that collects particulate contaminants from the gas by centrifugal force by rotating the introduced exhaust gas. The heat exchanger 310 is disposed at the rear end of the cyclone 300.

The heat exchanger 310 may cause damage to the components of the filter dust collector 320 by the moisture contained in the gas when the exhaust gas flows directly into the filter dust collector 320 disposed at a rear end thereof. It is for sending out by removing below the allowable value. The heat exchanger 310 condenses and removes moisture, and flows in approximately 450 °. Drop the hot gas at about 220 ℃ and send it out.

The rear end of the heat exchanger 310 is provided with a noxious gas treatment device 330. The toxic gas treatment device 330 is composed of a slaked lime injection device 332 and an activated carbon injection device 334. The slaked lime injection device 332 removes nitrogen oxides (NOx), sulfur oxides (SOx) and the like contained in the exhaust gas by spraying a predetermined amount of slaked lime in the powder state. Further, an activated carbon spraying device 334 is provided at the rear end of the calcined lime spraying device 332 to remove dioxins, odors, etc. by adsorption by spraying a predetermined amount of powdered activated carbon on the exhaust gas.

The filter dust collector 320 is disposed at the rear end of the activated carbon spraying device 334. The filter dust collector 320 collects and removes fine particles such as dust contained in the exhaust gas through the filter medium. The fine particles thus collected are stored in the dust collecting container 322, so that the dust collecting and cleaning can be simplified simply by emptying the dust collecting container 322.

At the rear end of the bag filter 320, a wet cleaning device 340 is provided. The wet cleaning device 340 attaches and removes the water-soluble harmful gas or particulate matter contained in the exhaust gas by the droplet or the liquid film. The exhaust gas passing through the wet cleaning device 340 is dropped to a temperature of approximately 60 ~ 80 ℃, the exhaust fan 350 is operated to be sent to the white smoke treatment device (360). The white smoke treatment device 360 is a forced air-cooled heat exchanger. When condensed water is generated by heat exchange, the relative humidity of the air introduced for heat exchange is lowered. When the air is mixed with the exhaust gas, the white smoke is discharged into the atmosphere. I) will not occur. As described above, the white smoke treatment apparatus 360 discharges the exhaust gas by adjusting the temperature and humidity conditions of the exhaust gas similarly to the temperature and humidity in the atmosphere. In this way, the exhaust gas whose temperature and humidity conditions are controlled in the white smoke treatment apparatus 360 is discharged into the atmosphere through the chimney 370. Emissions from the drying facility are colorless (because they are colorless), which can visually instill cleanliness in the neighborhood.

9 is a flowchart showing the operation of the drying apparatus. Now, the operation of the present drying apparatus, that is, the sludge drying method, will be described in detail with reference to FIG. 9 and FIGS. 1 to 7B described above.

When the drying apparatus is operated, the gantry crane 124 is operated to supply a predetermined amount of sludge 10 accumulated in the sludge storage chamber 122 to the input hopper 126. (Step S1) The input hopper 126 is a gantry crane. The sludge 10 received from 124 is continuously supplied to the drying furnace 110 by a predetermined amount using the transfer screw conveyor 128. (Step S3) At this time, the transfer screw conveyor 128 is provided with an inverter and dried. In accordance with the degree of sludge gun adjustment in the furnace 110, the inverter varies the driving speed of the transfer screw conveyor 128 to supply the sludge amount while adjusting the throughput of the drying furnace 110. In addition, a small amount of quicklime is added to the drying furnace 110 through the quicklime input means 130. (Step S5) The quicklime is added 2-10% by weight of the sludge input amount, preferably 5-10% by weight. It is suitable. The quicklime injected into the drying furnace 110 reacts as follows.

CaO + H ₂ O → Ca (OH) ₂ + 15.6 kcal / mole

As can be seen from the above equation, quicklime reacts with water in the sludge to generate heat to evaporate and reduce the water in the sludge. In addition, by raising the dry powder PH of the sludge to 12, not only sterilizes pathogens in the sludge, but also deodorizes the sludge, and also reduces the heavy metal elution in the sludge to stabilize the sludge. Furthermore, calcium oxide (CaO), which is a main component of quicklime, reinforces the lime component of cement and contributes greatly to the cementation of the sludge dry powder.

When the sludge and quicklime are supplied while being mixed as described above, the spiral feed ring 180 and the lifter 182 are rotated by the rotation of the drying furnace inner cylinder 116 in the front of the drying furnace 110, thereby forming a sludge in the form of agglomerates. The mixture is loaded on the lifter 182 to rise and fall. The sludge mixture dropped in this way is collided with the porous network 170 to collide. Accordingly, the sludge mixture is uniformly crushed by the collision with the porous mesh 170 and is loaded on the mesh so as to expose more area to hot air for a longer time. As such, in the front part of the drying furnace 110, the grinding efficiency and drying efficiency of the sludge 10 are increased due to the structure of the porous net 170. (Step S7)

The sludge 10 is transported by the spiral transfer ring 180 in the drying furnace 10 continuously after passing through the porous network section, and is repeatedly lifted and moved upward by the lifter 182 provided throughout the entire section. Evenly crushed and dried by hot air is discharged through the sludge discharge port 114 (step S9).

10A and 10B are flowcharts sequentially showing the overall treatment of the sewage sludge drying facility according to the present invention, in particular, FIG. 10A shows the treatment of sludge and FIG. 10B shows the treatment of the exhaust gas. The overall operation of the drying facility will be described in detail with reference to this drawing and FIG. 8 described above.

First, the drying treatment of the sludge can be used as the raw material, such as cement, dried sludge primarily dried in the drying furnace 110 as described above, but once more drying process is a better state. Therefore, in the drying facility, the sludge dried by the drying process described in detail in FIG. 9 is sent to the secondary drying apparatus 200. (Step S11) The secondary drying apparatus 200 includes a waste incinerator 230, Incineration of the waste 20 to supply hot air into the secondary drying furnace 210 to dry again the drying sludge dried in the primary drying furnace 110 (step S13) in this secondary drying furnace 210 The dried sludge is discharged through the sludge discharge port 214 and transferred to the drag chain conveyor 260 by air transfer, and is sequentially loaded on the arm roll box 262 through the drag chain conveyor 260. The dry sludge loaded in the arm roll box 262 is transported to a desired place by using the arm roll truck 264. (Step S15)

Next, a description will be given of the purification process of the exhaust gas after drying the sludge in the drying furnace. The hot wind (hot gas) used in the secondary drying furnace 210 is recovered as waste heat and supplied to the primary drying furnace 110 to be used and then discharged. (Step S20) The hot gas (emission gas) discharged in this way. Contains hazardous substances, which must be cleaned and released to the atmosphere. Therefore, the discharged gas is first sent to the cyclone 300 to separate and remove the particulate matter from the exhaust gas by centrifugal force. (Step S22) Then, the temperature drops while passing through the heat exchanger 310, and moisture is condensed. After the removal, the nitrogen oxide and sulfur oxide in the exhaust gas are removed by adsorption from the slaked lime injection device 332, and the odor and dioxin of the sludge are removed by adsorption by the activated carbon injection device 334. (Step S24, S26) Then, the particulate matter is collected and separated from the exhaust gas by the filter medium to the bag filter 320 (step S28). The water-soluble gas component and the particulate matter are separated and collected in the wet cleaning device 340. (Step S30) The exhaust gas that has undergone the purification process as described above is sent to the white smoke treatment apparatus 360 as a fan 350 to adjust the humidity and temperature of the exhaust gas similar to the humidity and temperature in the air stack chimney 370 (Step S32) Therefore, the gas discharged through the chimney 370 is purged in double and triple as described above, so that not only particulate matter but also harmful gas components are purified. In addition, since the air and the temperature / humidity is discharged in a similar manner, smoke does not occur, thereby providing a clean feeling visually.

The embodiments disclosed herein are only presented by selecting the most preferred examples to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by this embodiment, the present invention Various changes and modifications are possible within the scope without departing from the spirit of the invention, as well as other equivalent embodiments.

As described above, the present invention can be installed horizontally without inclining the drying furnace to transfer the sewage sludge by the rotation of the spiral feed ring can improve the stability and durability of the device due to the horizontal drive. In addition, since sewage sludge is supplied using a gantry crane, there is an advantage of eliminating backlogs at the time of supply and reducing the trouble by reducing the use of a belt conveyor. In addition, when the sewage sludge is added, a small amount of quicklime is added and mixed to increase the drying efficiency of the sewage sludge by the exothermic reaction and achieve sterilization effect. Furthermore, since waste (garbage) is used as a sludge incineration heat source, waste can be recycled and used together, contributing to energy saving.                     

Accordingly, the present invention can be recycled dry sludge crushed to a certain size to remove the odor as a cement raw material, so as to prevent environmental pollution due to disposal and reduce the cost of disposal of sewage sludge, There is an advantage in obtaining economic benefits.

In addition, the present drying equipment is installed in the sewage sludge drying apparatus in a multi-stage to completely clean the harmful substances from the exhaust gas and can be discharged to prevent environmental pollution.

Claims (14)

A crane for supplying sewage sludge at an appropriate amount; A hopper for feeding a predetermined amount of sewage sludge supplied to the crane; Quicklime injection means for supplying a small amount of quicklime; A spiral feeder that is helically attached to an inner wall to transfer the mixed sludge mixture through the hopper and the quicklime feeding means, and a lifter disposed along the circumferential direction between the spiral feed ring to load and raise the sludge mixture and to drop the sludge mixture; It has a porous network for crushing and loading and drying the sludge mixture dropped from the lifter at a predetermined interval near the sludge inlet in a predetermined interval, and fixed horizontally rotatable to hot air to the sludge mixture introduced through the inlet Rotary drying furnace for drying and discharged to the dry sludge through the outlet; Hot air providing means for providing hot air for drying the sewage sludge in the rotary drying furnace; And Sewage sludge drying apparatus comprising a rotation driving means for rotating the rotary drying furnace. The sewage sludge drying apparatus according to claim 1, wherein the quicklime is supplied at a blending ratio of 2 to 10% by weight of the sewage sludge. 3. The sewage sludge drying apparatus according to claim 2, wherein the quicklime blended in the sewage sludge reacts with moisture contained in the sewage sludge to generate heat required for drying itself. [next] CaO + H ₂ O → Ca (OH) ₂ + 15.6 kcal / mole The method of claim 1, wherein the lower portion of the hopper is supplied with a fixed amount of the sewage sludge supplied to the hopper, characterized in that it comprises a conveying screw conveyor having an inverter to adjust the input amount according to the processing state of the drying furnace. Sewage Sludge Dryer. The sewage sludge drying apparatus according to claim 1, wherein the crane is a gantry crane, and further comprising a storage compartment in which the gantry crane is installed and the sewage sludge is stored. The sewage sludge drying apparatus according to claim 1, wherein the hot air providing means is a burner using light oil, bunker seed oil, or the like, or a waste incinerator which produces hot air by incineration of waste (garbage). And a gantry crane for feeding and supplying sewage sludge, a hopper for supplying and controlling the amount of sewage sludge supplied to the gantry crane, and a rotary primary drying furnace for hot-air drying while transferring the sewage sludge fed from the hopper by rotation. Primary drying apparatus; A secondary drying apparatus having a secondary drying furnace for drying the dry sludge supplied from the primary drying furnace and a waste incinerator for providing hot air to the secondary drying furnace; And It includes a waste gas purifying apparatus for purifying the discharge gas discharged after drying the sewage sludge to the atmosphere, The exhaust gas purifying apparatus includes a cyclone for centrifuging the particulate matter from the exhaust gas discharged after drying the sewage sludge; A heat exchanger to condense and remove moisture contained in the exhaust gas; A noxious gas treatment apparatus for removing noxious gas components from the exhaust gas; A filter bag for separating and collecting particulate matter by passing the discharge gas through a filter material; And It characterized in that it comprises a wet cleaning device for removing water-soluble harmful gases and particulate matter from the exhaust gas, The primary drying furnace is horizontally supported at both ends so as to be rotatable, and has a double case structure of an outer cylinder and an inner cylinder, and an inner surface of the inner cylinder is disposed between a spiral feed ring for transporting sewage sludge and the spiral feed ring to load sewage sludge. And a sewage sludge drying facility characterized in that it comprises a lifter for lifting and falling, and a porous network for loading and drying the sewage sludge dropped from the lifter. delete delete 8. The sewage sludge drying facility according to claim 7, wherein the sewage sludge drying hot air in the primary drying furnace recovers waste heat from the secondary drying furnace, and uses a burner to reheat the recovered hot air. 8. The sewage sludge of claim 7, wherein the secondary drying apparatus further comprises a waste storage chamber for storing waste (garbage) and a gantry crane installed in the waste storage chamber for supplying waste to the waste incinerator. Drying equipment. According to claim 7, wherein the harmful gas treatment device is a hydrated lime injection device for injecting hydrated lime into the discharge gas to remove nitrogen oxides, sulfur oxides, etc. contained in the discharge gas by adsorption, and activated carbon powder to the discharge gas Sewage sludge drying equipment characterized in that it comprises an activated carbon spraying device for removing dioxins, odors, etc. in the exhaust gas by adsorption. The apparatus of claim 7, further comprising a white smoke treatment device configured to discharge the flue gas through a chimney without generating white smoke by adjusting the temperature and humidity of the discharge gas to be similar to the temperature and humidity of the atmosphere prior to discharge of the purified discharge gas into the atmosphere. Sewage sludge drying equipment. 8. The sewage sludge drying facility according to claim 7, wherein the dry sludge dried in the secondary drying furnace is loaded into the arm roll box through an air transfer and a drag chain conveyor.

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