KR20100057407A - Apparatus for mixing and molding sludge - Google Patents

Abstract

PURPOSE: An apparatus for mixing and molding sludge is provided to minimize the generation of dust during a drying process by coating dried sludge and wet sludge and forming a pellet. CONSTITUTION: An apparatus for mixing and molding sludge comprises the following: a casing unit(10) including an inlet for dried sludge and wet sludge on one end, and an outlet for mixed sludge on the other end; a mixing unit including a first blade unit(20) and a second blade unit(30) installed inside the casing unit in parallel to rotate around each rotary shaft for mixing and molding the dried sludge and the wet sludge; and a driving unit(40) connected with one end of the rotary shaft.

Description

Apparatus for mixing and molding sludge

The present invention relates to a sludge mixed molding apparatus, and more particularly, to a sludge mixed molding apparatus for mixing and molding mixed sludge by coating and pelletizing wet sludge on the outer surface of a dry sludge.

Sludge is a microbial residue from water treatment of water, industrial water, industrial wastewater, sewage and manure. The main components are mostly organic materials, and the sludge is in the form of dehydrated cake with a water content of 75 to 85%. Organic matters in sludge solids other than moisture are usually contained in various ranges of 40 to 80%. When dried, the calorific value usually ranges from 2,500 kcal / kg up to 4,500 kcal / kg.

Recently, there has been an increasing interest from sludge disposal to recycling. About 7 million tons of these sludges are generated annually, and about 3 million tons of sewage sludges are generated annually, and about 70% of the sludge is treated at sea.

In addition, since sludge sludge offshore dumping has been banned since 2011, the sludge that has been treated with offshore dumping should be treated on land. The government has recycled about 10% of wastewater in 2008 by 70% by 2011. A policy is being attempted to increase this.

To this end, various recycling laws are being financed, and one of them is the Renewable Portfolio Standards (RPS) system, which is a mandatory use law of renewable energy. This legislation requires that power generation companies or distributors who produce electricity make up a certain percentage of total generation or sales volume with renewable energy.

Accordingly, power generation companies are developing alternative fuels to replace existing fossil fuels, and the best fuel to replace coal is known as dried sludge. Dried sludge can be used as a substitute for coal when dehydrated sludge having a water content of 70 to 90% is produced at a water content of 10% or less.

The sludge recycling method for this purpose is a solidification method, a simple drying, composting, carbonization, lightweight aggregate, fuelization method, a conventional apparatus for mixing the solidifying agent or quicklime and sludge in the solidification method. A screw mixer disclosed in US Pat. No. 10-0436391, a paddle mixer disclosed in JP-A No. 20-0412633, and a hammer mixer disclosed in JP-A-10-0305689 were used.

However, such a conventional mixing device is simply a device for mixing the solidifying agent with the sludge, which is not completely sealed, causing bad smell, and irregular mixing, so that the water content of the mixed sludge is not uniform.

In addition, the mixed sludge for such a conventional mixer has a problem that the drying process is shut down by blocking a passage in the drying apparatus, and dust inevitably occurs in the drying process, thereby transporting and utilizing the dried sludge. There was also a problem that it was difficult to handle and recycle by dust.

The present invention has been made to solve the conventional problems as described above, to minimize the generation of dust in the drying process by coating the wet sludge in the drying sludge and pelletized (Pellet) to dry, the sludge drying efficiency of the drying energy It can reduce the use and avoid the shut down process by avoiding the glue zone, which is a section where the mixed sludge agglomerates in the drying apparatus, which is a post process, to block the passage, and the dried sludge is prevented. It is an object of the present invention to provide a sludge mixed molding apparatus that can be easily handled and recycled since there is no dust generated during transportation and utilization.

The present invention for achieving the above object, the casing portion formed in the inlet of the drying sludge and wet sludge at one end and the outlet of the mixed sludge at the other end; First and second blades which are rotatably centered around respective rotating shafts installed in parallel on the same horizontal surface of the casing part and mixed with the dry sludge and the wet sludge introduced into the inlet, and are discharged to the outlet. Mixing portion provided with; And a driving unit connected to one end of any one of the rotary shafts to impart a rotary driving force to the rotary shafts.

The inlet of the casing part of the present invention includes a first inlet through which the dry sludge is input, and a second inlet through which the wet sludge is input. The second inlet of the present invention is provided below the first inlet.

The dry sludge of the present invention has a water content of 10% or less, the wet sludge has a water content of 70 to 90%, and the mixed sludge has a water content of 25 to 30%.

On the rotating shaft of the first blade portion and the second blade portion of the present invention, a plurality of blades are intermittently spaced apart from each other and are arranged to cross each other.

The blade of the present invention consists of a support that is fixed to the outer periphery of the rotary shaft via a fixing portion and a blade surface engraved outwardly from the support, wherein the blade surface is the axis of the fixed portion relative to the vertical plane of the rotary shaft 8 It rotates by the rotation angle (alpha) of -12 degrees.

The rotating shafts of the first blade portion and the second blade portion of the present invention are connected via a power transmission member to rotate in opposite directions.

As described above, the present invention can minimize the generation of dust in the drying process by coating the wet sludge in the drying sludge by pelletizing (Pellet) to increase the drying efficiency, thereby reducing the use of drying energy.

Mixed sludge can be prevented from being shut down by avoiding glue zone, which is a section that blocks the passage by agglomeration in the drying device that is a post process, and dried sludge generates dust during transportation and utilization. It has the effect of easy handling and recycling.

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

1 is a top view showing a sludge mixed molding apparatus according to an embodiment of the present invention, Figure 2 is a front sectional view showing a sludge mixed molding apparatus according to an embodiment of the present invention, Figure 3 is a Figure 4 is a side view showing a sludge mixed molding apparatus according to an embodiment, Figure 4 is an enlarged view showing a mixing portion of the sludge mixed molding apparatus according to an embodiment of the present invention, Figure 5 is a view according to an embodiment of the present invention It is a front view which shows the blade of the sludge mixed molding apparatus, FIG. 6 is a top view which shows the blade of the sludge mixed molding apparatus which concerns on one Embodiment of this invention, FIG. 7 is sectional drawing by the cutting line AA of FIG.

As shown in Figs. 1 to 3, the sludge mixing molding apparatus of this embodiment is a mixing part and a driving part 40 having a casing part 10, a first blade part 20 and a second blade part 30. It is made, including.

The present invention relates to a mixing apparatus included in the sludge drying apparatus disclosed in Korean Patent Nos. 10-0812707 and 10-0851948, wherein a wet sludge of about 80% moisture content is coated on an outer surface of a dry sludge having a water content of 10% or less. The present invention relates to an apparatus for mixing and molding mixed sludge having a water content of 25 to 30% by pelletizing the pellets.

The casing part 10 is installed on the upper part of the main frame 100, and the dry sludge and the wet sludge are added to one end thereof to be mixed and molded to form the mixed sludge and discharged to the outlet of the other end. 1 is composed of an inlet 12, outlet 13, the inspection window 14, the support frame 15.

The case 11 is installed in the longitudinal direction on the upper part of the main frame 100, the body of the casing portion 10 and the bottom surface is formed in a curved shape is formed to facilitate the mixing of dry sludge and wet sludge.

The inlet of the casing part 10 is formed at one end of the case 11 and includes a first inlet 12 through which dry sludge is input and a second inlet 50 through which wet sludge is input. The first inlet 12 is installed above the one end of the case 11 and the dry sludge is introduced. The second inlet 50 is provided below the first inlet 12.

Accordingly, by installing the second sludge inlet 50 of the wet sludge under the first inlet 12 of the dry sludge, the moisture introduced from the lower part of the casing part 10 to the surface of the dry sludge injected from the upper part of the casing part 10. The sludge is mixed and the wet sludge is easily coated on the outer surface of the dry sludge.

The discharge port 13 is formed at the lower end of the other end of the case 11, and discharges the mixed sludge mixed with the dry sludge and the wet sludge introduced into the inlet to the dryer (not shown) of the post process.

The inspection window 14 is installed on the upper part of the case 11 and opened and closed in a one-touch type, and is formed of a glass material so that an operator can conveniently check the internal operating state of the case 11.

The support frame 15 is installed on the upper part of the main frame 100 to support the case 11, and a plurality of support frames 15 are installed on the lower part of the case 11.

The mixing part is rotatable about each rotating shaft which is installed in parallel on the same horizontal plane inside the casing part 10 and mix-molded the dry sludge and the wet sludge introduced into the inlet to discharge the mixed sludge to the outlet 13. The 1st blade part 20 and the 2nd blade part 30 are provided.

The second blade portion 30 is formed by mixing and drying the dry sludge and wet sludge to form a mixed sludge, the rotary shaft 31, the blade 32, the support shaft 33, the power transmission member 34, the driven shaft 35 ), And a power transmission piece 36.

The rotating shaft 31 is formed in a cylindrical bar shape or a square bar shape so that both ends thereof are rotatably supported by the casing portion 10.

As shown in FIGS. 4 to 6, the plurality of blades 32 are intermittently spaced apart from each other on the rotation shaft 31 and are arranged to intersect with each other. The blade 32 consists of the support 32b which is fixed to the outer periphery of the rotating shaft 31 via the fixing part 32c, such as a bolt, and the blade surface 32a recessed outwardly from the said support 32b. The blade surface 32a is rotated by a rotation angle α of 8 to 12 degrees with the fixing part 32c as an axis with respect to the vertical surface of the rotation shaft 31.

The reason why the blade 32 is rotated by the rotation angle α of 8 to 12 degrees around the fixing part is that when the rotation angle α is smaller than 8 degrees, the amount of sludge conveyed by the blade 32 is small and the driving force is reduced. Not only is it excessively consumed, but it is not easy to mix the sludge, and if the rotation angle α is larger than 12 °, the sludge feed rate is fast, so that the mixed sludge of the dry sludge and the wet sludge may be discharged without being made. .

The support shaft 33 is formed at one end of the rotation shaft 31 and is rotatably supported on one side of the casing portion 10 via a bearing 33a. The power transmission member 34 is fitted to the outer circumference of the support shaft 33 to transmit the driving force. The power transmission member 34 is preferably made of a gear formed teeth. The driven shaft 35 is formed at the other end of the rotating shaft 31 and is rotatably supported via the bearing 35a at the other side of the casing portion 10.

The power transmission piece 36 is a member that receives the rotational driving force of the driving unit 40, but is installed in the second blade unit 30 in the present embodiment, but is not limited thereto and is also installed in the first blade unit 20. Can be.

The power transmission piece 36 is formed of a coupling structure of a shaft and a boss having a key inserted into one end of a driven shaft 35, such as a sprocket or a pulley. It consists of a transmission member.

Since the first blade portion 20 is formed in the same shape as the second blade portion 30 and is given only a reference number, specific drawings are omitted.

Like the second blade portion 30, the first blade portion 20 forms a mixed sludge by mixing and drying the dry sludge and the wet sludge, and the rotary shaft 21, the blade 22, the support shaft 23, and the power transmission member. (24), the driven shaft (25).

The rotating shaft 21 is formed in a cylindrical bar shape or a square bar shape so that both ends are rotatably supported by the casing portion 10.

The blades 22 are arranged on the rotary shaft 21 so as to be intermittently spaced apart and intersect with each other. The blade 22 is composed of a support fixed to the outer circumference of the rotating shaft 21 via a fixing part such as a bolt, and a blade surface recessed outwardly from the support. Moreover, such a blade surface is rotated by the rotation angle (alpha) of 8-12 degrees with respect to the perpendicular | vertical surface of the rotating shaft 21 about the said fixed part as an axis.

The reason why the blade 22 is rotated by the rotation angle α of 8 to 12 degrees around the fixing part is that when the rotation angle α is smaller than 8 degrees, the amount of sludge conveyed by the blade 22 is small and the driving force is reduced. Not only is this excessively consumed, but it is not easy to mix the sludge, and if the rotation angle α is larger than 12 °, the sludge feed rate is fast, so that the mixed sludge of the dry sludge and the wet sludge may be discharged without being made. .

The support shaft 23 is formed at one end of the rotation shaft 21 and rotatably supported at one side of the casing portion 10 via a bearing 23a. The power transmission member 24 is fitted to the outer circumference of the support shaft 23 to transmit the driving force. The power transmission member 24 is preferably made of a gear formed teeth.

The driven shaft 25 is formed at the other end of the rotating shaft 21 and is rotatably supported via the bearing 25a at the other side of the casing portion 10.

Accordingly, the drive shaft 40 is connected to one of the rotary shafts 21 of the first blade unit 20 and the rotary shaft 31 of the second blade unit 30, and the power transmission member 24 installed at both ends thereof. , 34 are connected via each other and rotated in opposite directions.

That is, as shown in FIG. 7, the rotating shaft 21 of the first blade portion 20 is rotated counterclockwise and the rotating shaft 31 of the second blade portion 30 is rotated clockwise, thereby providing the first blade. Dry sludge and wet sludge are mixed and molded between the portion 20 and the second blade portion 30.

The driving unit 40 is connected to one end of any one of the rotation shafts 21 and 31 of the first blade unit 20 and the second blade unit 30 so as to give a rotation driving force to the rotation shaft, the drive motor 41, It consists of the speed reducer 42, the drive piece 43, and the power transmission part 44.

The driving motor 41 is a driving source of the driving unit 40 that provides the rotational driving force to the rotating shaft, and it is possible to use a servo motor that can control the driving force and the rotational speed according to the sludge input state or shape, but various motors are used. It is possible to.

The reducer 42 is connected to the drive shaft of the drive motor 41 to control the magnitude and speed of the rotational driving force. The driving piece 43 is composed of a coupling structure of a shaft and a boss in which a key is inserted into the rear end of the reduction gear, and includes a transmission member such as a sprocket or a pulley.

The power transmission part 44 is a member for transmitting the driving force of the driving piece 43 to the power transmission piece 36 of the driven shaft 35, and various transmission members such as a chain and a belt are used.

It is preferable to use dry sludge having a water content of 10% or less and wet sludge having a water content of 70 to 90%. In addition, it is preferable that the mixed sludge mixed-molded in the sludge mixed molding apparatus of this embodiment maintains a predetermined mixing ratio so that the water content is 25 to 30%.

If the moisture content of the dry sludge is higher than 10%, it is preferable to maintain it at 10% or less since recyclability is reduced as regenerated fuel such as auxiliary fuel. In addition, when the moisture content of the wet sludge is out of 70 to 90%, it is not preferable because it is difficult to transport by excessive moisture or excessive drying costs.

If the water content of the mixed sludge is greater than 30%, the drying time of the mixed sludge is excessive, and if the water content is less than 25%, the amount of dry sludge to be dried is reduced and the treatment efficiency is lowered. desirable.

In addition, since the water content of the mixed sludge is changed according to the mixing ratio of the dry sludge and the wet sludge, it is of course not limited thereto and may be changed in the range of 20 to 60%.

Particularly, the mixing part has three to four blades of the rotor blades alternately attached to two rotating shafts in the direction of the rotating screw. One rotating shaft rotates clockwise and the other rotating shaft rotates counterclockwise. It moves inward and mixes them.

In addition, the time for the sludge to escape from the inlet to the outlet is typically about 5 minutes, and the blade bolted on the rotating shaft is inclined at a rotational angle of approximately 8 to 12 °, so that the residence time of the sludge in the mixing molding apparatus. Can be adjusted.

In addition, the sludge mixed molding apparatus of the present embodiment is to produce a pellet of 8mm or less by coating wet sludge of about 80% moisture content to dry sludge having a water content of 10% to about 0-2mm.

As a result of coating the wet sludge with the dry sludge as described above, the wet sludge attached to the outer surface of the sludge is dried, thereby reducing the energy required for drying the sludge.

As such, the surface of the dry sludge is coated with pellets to form pellets, thereby minimizing dust generation in the drying process, and easy to handle since there is little dust during transportation or recycling of dry matter. Have

The rotational speed of the driving unit 40 is fixed at 24 rpm, and the water content of the mixed sludge can be adjusted according to the input amount of the dry sludge and the input amount of the wet sludge.

Moreover, of course, it is also possible to add the equipment which can add a part of solidifying agents, such as quicklime, also to the sludge mixing molding apparatus of this embodiment.

Example 1

The mixing experiment of the present embodiment was carried out mixing experiments of wet sludge with water content of about 80% and dry sludge with a water content of 10%. After mixing, the water content of the mixed sludge was 25 to 30% and the residence time was about 5 minutes.

As a result of analyzing the particle size of the dried sludge after drying the mixed sludge, dry sludge having a particle size of less than 2 mm was 84.6 to 43.5%, and dried sludge having a particle diameter of 2 to 8 mm was 15.4 to 56.5%, as shown in Table 1. It was.

division Mouth Wt (%)
Sludge Fuel Coal

Over 8mm 0.00 2 mm or more to 8 mm or less 56.48 Less than 2mm 43.52 Sum 100.00
Sludge Fuel Coal

Over 8mm 0.00 2 mm or more to 8 mm or less 15.42 Less than 2mm 84.58 Sum 100.00

Therefore, the dry sludge having a moisture content of 10% or less is coated with wet sludge having a water content of about 80% and pelletized to produce a mixed sludge having a water content of 25 to 30% while pelletizing it, thereby drying the particles having a particle diameter of less than 2 mm that can be fuelized after drying. The ratio of sludge can be improved.

The present invention described above can be embodied in many other forms without departing from the spirit or main features thereof. Therefore, the above embodiments are merely examples in all respects and should not be interpreted limitedly.

1 is a top view showing a sludge mixed molding apparatus according to an embodiment of the present invention.

Figure 2 is a front sectional view showing a sludge mixed molding apparatus according to an embodiment of the present invention.

Figure 3 is a side view showing a sludge mixed molding apparatus according to an embodiment of the present invention.

Figure 4 is an enlarged view showing a mixing portion of the sludge mixed molding apparatus according to an embodiment of the present invention.

5 is a front view showing a blade of the sludge mixed molding apparatus according to an embodiment of the present invention.

Figure 6 is a top view showing a blade of the sludge mixed molding apparatus according to an embodiment of the present invention.

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

<Description of the symbols for the main parts of the drawings>

10: casing portion 12: first input portion

20: first blade portion 30: second blade portion

40: drive part 50: second input part

Claims (7)

A casing part in which an inlet of dry sludge and wet sludge is formed at one end and a discharge port of mixed sludge is formed at the other end; First and second blades which are rotatably centered around respective rotating shafts installed in parallel on the same horizontal surface of the casing part and mixed with the dry sludge and the wet sludge introduced into the inlet, and are discharged to the outlet. Mixing portion provided with; And And a driving unit connected to one end of any one of the rotary shafts to impart a rotary driving force to the rotary shafts. The method of claim 1, The inlet of the casing portion is a sludge mixed molding apparatus comprising a first inlet for the dry sludge is introduced, and a second inlet for the wet sludge. The method of claim 2, Said second inlet is installed in the lower portion of the first inlet sludge mixed molding apparatus. The method of claim 1, The dry sludge has a water content of 10% or less, the wet sludge has a water content of 70 to 90%, and the mixed sludge has a water content of 25 to 30%. The method of claim 1, Sludge mixed molding apparatus, characterized in that the plurality of blades are intermittently spaced apart on the rotation axis of the first blade portion and the second blade portion are arranged to cross each other. The method of claim 5, The blade is composed of a support that is fixed to the outer periphery of the rotary shaft via a fixing portion and a blade surface standing out from the support, the blade surface is 8 to 12 with the fixed portion as the axis relative to the vertical surface of the rotary shaft A sludge mixed molding apparatus, wherein the sludge is rotated by a rotation angle α. The method of claim 1, The rotating shaft of the first blade portion and the second blade portion is connected via a power transmission member is rotated in the opposite direction, characterized in that the sludge mixed molding apparatus.

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