KR101728081B1 - Sludge and function using a hot air dryer Rotary Sieve grinder - Google Patents

Abstract

The present invention relates to a hot air dryer for high-moisture sludge using a rotary sieve grinder and, more specifically, relates to a hot air dryer for high-moisture sludge using a rotary sieve grinder using a rotary sieve grinder, which is configured to directly heat the sludge through a plurality of holes perforated in a cylindrical drum and to smoothly flow hot air so as to maximize contact and flow of dry heat onto a particle surface of a dried object (sludge), thereby maximizing drying efficiency. According to the present invention, the hot air dryer for high-moisture sludge includes: a housing (20) having a discharge hole (22) formed on a lower portion in a conical shape to discharge the dried sludge (10); a hot air inlet (30) formed on a lower side of the housing (20) to introduce hot air into the housing (20); and a rotary sieve grinder (40) for squeezing and grinding the sludge (10) introduced into the housing (20).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high-function sludge hot air dryer using a rotary sieve crusher,

The present invention relates to a high-function sludge hot-air dryer using a rotary sieve crusher, and more particularly, to a high-function sewage sludge, a sludge sludge, a sludge sludge, To increase the specific surface area by small, uniform, crushing and screening of particles of high-function sludge by means of a sieve crusher, and to smoothly discharge the pulverized particles to a lower part, it is possible to produce a uniform dry product of less than 10% To a high function sludge hot air dryer using a rotary sieve crusher.

Generally, the organic waste treatment technology is very difficult and urgent to treat organic wastes such as food wastes, manure and fish wastes, fishery wastes, slaughter wastes, food wastes, livestock farms and seafood and sewage sludge, which have become extreme environmental pollutants, Natural kill bacteria and pests. In addition, not only the salt, odor, leachate, toxicity of heavy metals, which was a difficult problem in the treatment process of food waste, is reduced to zero, but food waste with a water content of 75% or more is naturally reduced to less than 30%, and high calcium nutrient fertilizer, It can be used as an alternative fertilizer to solve the environmental pollution problem and to recycle the by-product. In addition, it can utilize the additional benefits and advantages.

Recently, a method of treating organic wastes to effectively treat organic wastes such as food wastes, animal wastes, and sludge has recently been proposed. Among them, biologically fermented methods for composting have been attracting attention. It is dried at less than 10% moisture content and is currently being used as an auxiliary fuel for thermal power plants

It is preferable that the drying and the fermentation process are simultaneously carried out in the process of biologically fermenting organic wastes and composting them. In order to perform the drying and fermentation processes at the same time, it is necessary to form a long process route or to improve the thermal efficiency of the supplied hot air.

In addition, when the amount of waste to be supplied is large, the drying efficiency must be improved by forming a longer path for the waste in the drying tube or by increasing the time during which the supplied hot air is stored in the drying tube.

However, conventionally, there is a limit in forming a long length of the drying tube. Generally, the center of the drying tube is provided with a rotary shaft for converting the hot air introduced into the eddy current into a vortex and for crushing and scattering the waste. When the length of the drying tube becomes long, the length of the rotary shaft must be long. However, if the length of the rotary shaft becomes excessively long, deflection occurs at the middle portion of the rotary shaft, thereby causing mechanical defects of the apparatus. This is a problem that needs to be solved technically urgently according to the manufacturing trend of increasing capacity of the facility.

In addition, in the conventional art, the hot air supplied to the inside of the drying tube escapes to the outside of the drying tube before the waste is dried and fermented, thereby significantly reducing the thermal efficiency and increasing the consumption of fuel.

In addition, a commonly known single rotary kiln dryer is widely used for food wastes or various multi-purpose drying, but recently the trend of using three-stage rotary drying equipment for sewage sludge drying treatment as a result of energy efficiency and environmental problems (Eg, ANDRiTZ Co in Austria). Although the three-stage rotary dryer maintains superior drying efficiency compared to the single rotary dryer, it is difficult to apply food waste or multi-purpose due to drum clogging.

In addition, the lowering of the flow velocity in the two-stage and three-stage drum of the three-stage rotary drum makes it difficult to maintain proper water content, and the sludge flow space in the two-stage and three-stage drum is relatively narrow, . If the volume of food waste or material to be dried is large, the conventional three-stage rotary drying device can not be used. In order to reduce such clogging, the outer diameter of the drum must be increased so that the flow cross-sectional area of the laundry is enlarged, and the laundry to be charged should be in the form of a powder, not in the form of a lump. Thus, a wet sludge cake (cake shape, water content 80%) is mixed with dried sludge to make mixed sludge in powder form (water content 30%) and then put into a three-stage drying apparatus. Therefore, not only does it require a large three-stage rotary drum, a large footprint and ancillary mixers (mixers, sorting machines, crushers, conveying screws), there is also a risk of inefficiency and operational hazards in dryer maintenance. That is, conventional single- or three-stage rotary drying equipment requires excessive equipment costs, maintenance and operation costs.

In Korean Patent No. 10-1338369 entitled " Air-circulating low-temperature hot wind sludge drying treatment facility and treatment method ", " natural dropping method by self weight is adopted " This is a natural dropping type discharge structure by only drying by hot air and by the weight of the dry body without mechanical external force to the dry body.

The natural drop discharge method by self weight is problematic in that particles are clogged due to entanglement (aka, bridging phenomenon) between the particles due to the nature of the sludge powder. In addition, since the particle size is large, the drying time is long and the drying energy cost is increased.

In order to solve such a problem, in the present invention, the sludge particles are pulverized, sorted and forced downward by using the forward and reverse rotation motions of the cylindrical drum-type rotary drum pulverizer to make the particles of the substance to be dried uniformly small It is a technology to maximize drying efficiency by forced downward discharge to prevent entanglement of sludge particles.

U.S. Patent 4,477,984 (Oct, 23/1984), Harvey Wenger Korean Patent No. 10-0812707, Sludge Drying Apparatus and Drying Method, POSCO E & C (Hyun Bae Kim et al.) Domestic patent application No. 10-2008-0064624 (filed on July 4, 2008), radial rotary dryer, Kim Yong et al. Applied for utility model 20-0190705, 31st December 1999 Korean Patent No. 10-1338369 entitled " Air-circulation type low-temperature hot wind sludge drying treatment facility and treatment method

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a drying method and a drying method capable of smoothly flowing hot air directly through a plurality of holes drilled in a cylindrical drum, So that the drying efficiency can be maximized.

The present invention also relates to a sludge granulating method for sludge granulating and granulating apparatus, which is capable of preventing sludge particles that are to be dried from being entangled with each other by forcibly discharging homogeneous particles of a predetermined size in a downward direction, And it is an object of the present invention to increase the drying efficiency by pulverizing and sorting the sludge particle size stepwise smaller.

The present invention also aims to provide a homogeneous and stable quality control of the moisture content in the final sludge dried product since the particles of the sludge to be dried are pulverized and sorted into a small and homogeneous size.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

The structure of the high-function sludge hot air dryer using the rotary cube pulverizer according to the present invention is as shown in the drawing,

A housing 20 having an inlet 21 formed at an upper portion thereof for introducing the sludge 10 and a discharge port 22 for discharging the dried sludge 10 in a conical shape at a lower portion thereof,

A hot air inlet 30 formed at a lower side of the housing 20 for introducing hot air into the housing 20,

A rotary crib crusher 40 is provided in which a plurality of sludges 10 injected into the housing 20 are horizontally formed at a horizontal interval L1 so as to be crushed and sorted, And,

The rotary sieve crusher 40 includes a plurality of perforated sorting holes 52 for selectively flowing the pulverized sludge 10 and a plurality of sludge blasting units 52 for dropping the sludge 10, A cylindrical drum 50 having a sludge dropping space 51 formed therein,

A support plate 54 integrally joined to support the cylindrical drum 50 on both sides thereof and having a plurality of apertures 53 formed therein,

And a rotary shaft 55 coupled to the support plate 54 to receive the power to rotate the cylindrical drum 50 forward and backward.

According to the present invention having such characteristics as described above, the rotary sieving crusher can perform a forced discharge of the sludge particles in the downward direction while pulverizing and sorting the sludge particles, thereby preventing the entanglement between the sludge particles at the source, By maximizing the drying efficiency and increasing the efficiency of dry energy, it can contribute greatly to the policy of reducing CO2, which is an international issue.

In addition, according to the present invention, it can be seen that the smaller the particle size of the sludge to be dried is, the higher the drying efficiency is, and therefore, the sludge particles of the substance to be dried are forcedly pulverized and sorted during the drying process, There is an effect.

1 is a sectional view showing the internal structure of a hot air dryer according to the present invention.
2 is a perspective view showing a rotary cube crusher according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The main feature of the hot air dryer according to the present invention is that the main feature of the hot air drier according to the present invention is that the housing 20 for introducing the hot air while discharging the sludge 10 which has flowed into the sludge 10, And a rotary cube crusher 40 that receives the power of the motor and rotates in the forward and reverse directions so that the sludge 10 introduced into the sludge 10 can be crushed, sorted, and dried.

The main configuration will be described in more detail with reference to the drawings.

As shown in Fig. 1, the structure of the housing 20 for loading and drying various sludges 10 is formed in a conical shape on the lower side of the rectangular body, and has an inlet 21 for introducing sludge into the upper side, And an outlet 22 for discharging the dried sludge 10 is formed.

The discharge port 22 is formed with a rotating body 81 connected to the motor 80 and rotated to uniformly discharge the dried sludge 10.

The hot air inlet 30 is connected to the housing 20 so as to dry the sludge 10 to be crushed and sorted into the housing 20 while the hot air is introduced into the housing 20 from the lower portion thereof, 20).

A rotary sieve crusher 40 is disposed at a plurality of stages so as to be horizontally spaced apart so that the sludge 10 injected into the housing 20 can be crushed and sorted while being dried.

As shown in FIG. 2, the rotary pulverizer 40 includes a cylindrical drum 50, a sludge 10 that flows into the interior of the housing 20 on the outer circumferential surface thereof, A plurality of holes 52 are formed.

A sludge dropping space 51 is formed in the lower side of the cylindrical drum 50 so as to have a sludge dropping space 51 for dropping the sludge 10 that has been crushed and sorted by the sorting hole 52 and drying it by hot air.

At this time, three rotary cube pulverizers 40 formed at the ends are formed at intervals in the figure, but the number of the rotary cube pulverizers 40 may be three or more, depending on the drying capacity of the sludge 10.

As shown in FIG. 1, the rotary cube crusher 40, which is formed in a plurality of stages at the inner portion of the housing 20, is constituted by a plurality of vertically spaced first, second, and third stages. In the drawings, the three-stage structure is shown. However, the present invention is not limited to this, and three or more stages can be installed so as to increase the drying efficiency.

The horizontal intervals L1, L2, and L3 of the rotary cube pulverizer 40 formed at the above stages are 5 mm at the first stage, 3 mm at the second stage, and 1 mm at the third stage.

The diameter of the multiple perforated screen 52 on the outer circumferential surface of the cylindrical drum 50 of the rotary pulverizer 40 is 5 mm in the first stage, 3 mm in the second stage, and 1 mm in the third stage.

That is, the diameter of the sorting hole 52 is formed by drilling the rotary sieves 40 to the same dimensions as the horizontal intervals L1, L2, and L3 formed by the first, second, and third stages. In other words, the dimensions of the sorting hole 52 are such that the high-function sludge 10 to be dried is drilled in the same manner as the particle size to be crushed and sorted, and the horizontal intervals L1, L2, and L3) are formed so as to have the same particle size as that of the sludge 10 pulverized and sorted.

The sludge 10 charged into the inlet 21 of the housing 20 is supplied to a portion of the rotary cement pulverizer 40 having the first, second and third stages contacting the inside of the housing 20, A slope guide plate 60 for smoothly guiding the slurry to the horizontal intervals L1, L2 and L3 between the rotary seed pulverizer 40 and the rotary seed pulverizer 40 is constructed.

As described above, according to the present invention, in the first stage of the rotary cube crusher 40 installed at the upper vertical inner portion of the housing 20, the crushed, sorted particle size is large, and the crushed, The size of the selective particle becomes smaller and the size of the final pulverization and the selection particle is 1 mm or less, thereby maximizing the drying efficiency of the sludge.

A hood device 70 is installed on the upper side of the housing 20 so as to collect and discharge the steam exhaust gas generated when the sludge 10 introduced into the housing 20 is dried by hot air, 70) is then sent to the process deodorizing and cleaning process.

1, the housing 20 and the hood device 70 are separated from each other. However, the housing 20 is connected to the upper side of the housing 20 with one side of the inlet 21 of the housing 20 closed.

The operating state of the hot air dryer of the present invention constructed as above will be described in more detail with reference to FIG.

As shown in FIG. 1, the sludge 10 generated at various sites is introduced into the inlet 21 formed at the upper side of the housing 20. The charged sludge 10 is introduced into the rotary chamber 40 through the horizontal intervals L1, L2 and L3 of the rotary cube crusher 40 and the rotary cube crusher 40 along the inclined guide plate 60 mounted on the inner side of the housing 20, ).

At this time, when a motor (not shown, a forward and reverse motor in the drawing) is driven by being connected to a power source in advance and a rotary shaft 55, which receives power by driving the motor, is driven, a rotary rotary shredder 40) are rotated in the forward and reverse directions. The forward and reverse motor drive can be controlled by the time controller.

Therefore, the sludge 10 introduced into the housing 20 has a horizontal gap of 5 mm formed between the rotary cube crusher 40 and the rotary cube crusher 40, L1) and pulverized and sorted.

That is, the rotary sieve crushers 40 formed in one stage are crushed by squeezing the sludge 10 flowing in a horizontal interval L 1 of 5 mm while rotating forward and backward with respect to each other. The sludge 10 pulverized to 5 mm as described above is introduced into the outer peripheral surface of the cylindrical drum 50 through the perforated screen 52 and is dried by the hot air introduced into the lower portion of the cylindrical drum 50, And falls down to the bottom.

The sludge 10 pulverized and sorted through the rotary cube pulverizer 40 of the first stage (a) is returned to the lower portion of the sludge 10, and the two stages (b) provided on the lower side of the first stage (a) The rotary sieving pulverizer 40 formed at the second stage (b) flows into the rotary sieve pulverizer 40 at a horizontal interval L2 of 3 mm formed between the rotary sieve pulverizer 40 and the rotary sieving pulverizer 40, The sludge 10 flowing in a horizontal interval L2 of 3 mm while rotating in reverse is crushed and crushed. The sludge 10 pulverized to 3 mm as described above is introduced into the outer peripheral surface of the cylindrical drum 50 through a plurality of perforated screening holes 52 and is dried by hot air introduced into the lower portion of the cylindrical drum 50, And falls down to the bottom.

The sludge 10 pulverized and sorted through the rotary pulverizer 40 of the second stage (b) is returned to the lower stage and the three stages (c) provided at the lower side of the second stage (b) The rotary cube crusher 40 formed in the third stage c is introduced into the rotary sieve crusher 40 through the horizontal gap L3 of 1 mm formed between the rotary sieve crusher 40 and the rotary sieve crusher 40, The sludge 10 flowing in a horizontal interval L3 of 1 mm while being counter-rotated is crushed and crushed. The sludge 10 pulverized at 1 mm as described above is introduced into the outer peripheral surface of the cylindrical drum 50 through the perforated screen 52 and dried at the same time by the hot air introduced into the lower portion of the cylindrical drum 50, And falls down to the bottom.

At this time, the rotational angle at which the forward and reverse rotatable rotary crushers 40 are rotated in the forward and reverse directions is rotated from 0 to 120 degrees.

That is, the sludge is uniformly pulverized and sorted into chucks 5 mm, 3 mm, and 1 mm while being passed through a rotary cube crusher 40 installed at intervals of 1, 2, and 3 stages and dropped to the bottom of the housing 20 .

A plurality of perforated screening holes 52 are formed in the surface of the cylindrical drum 50 of the rotary sieve pulverizer 40 spaced apart from the first, second and third stages, The sludge 10 pulverized by the forward and backward rotations of the rotary pulverizer 40 is purged from the bottom of the sludge 10 by 1 , And gradually through a plurality of perforated screening holes 52 on the outer circumferential surface of the cylindrical drum 50 of the second and third stages. At this time, the sludge 10, which is larger than the diameter of the non-selected sorting hole 52, is sieved by the rotary sieving crusher 40 which continues to rotate in the forward and reverse directions, and is sorted by the sorting hole 52, The sludge 10 crushed to a diameter larger than the diameter of the sludge 52 is forcibly crushed and discharged to the lower part through the horizontal intervals L1, L2 and L3.

As a result, forced discharge falls without tangling between the particles of the sludge 10 that are crushed and sorted into the lower portion of the housing 20 and are sequentially discharged forcibly downward to the lower side. That is, since the sludge dropping space 51 is formed in the lower portion of the cylindrical drum 50, the particles of the pulverized and sorted sludge 10 are not accumulated in the cylindrical drum 50 and are discharged smoothly It will be dried up.

Since the rotating body 81 connected to the motor 80 and rotated to uniformly discharge the dried sludge 10 is formed in the discharge port 22, the discharge of the sludge 10 is smooth It can be uniformly discharged.

The sludge 10 introduced at the horizontal intervals L1, L2, and L3 is crushed and sorted by the forward and reverse rotations of the rotary cube crusher 40 installed in the first, second, and third stages as described above, 20, it flows into the hot air inflow port 30 formed at one side of the lower part of the housing 20, and is contacted with the hot air of 130 ° C. to 280 ° C. rising from the lower part to the upper part and dried .

At this time, if the temperature of the hot air becomes lower than 130 ° C., the water content of the sludge 10 to be dried becomes 10% or more. If the temperature of the hot air becomes higher than 130 ° C., The temperature of the hot air is preferably 130 ° C. to 280 ° C. in order to keep the water content of the dried sludge 10 at 10% or less. The passing speed of the hot air on the surface of the sludge to be dried (sludge) is preferably 2 to 20 cm / sec.

The hot air introduced into the lower portion of the housing 20 flows into the sludge dropping space 51 formed in the lower portion of the cylindrical drum 50 and discharged into the sorting hole 52, Since contact and flow on the surface are maximized, the drying efficiency can be maximized.

The pulverized and sorted sludge 10 drops down to the lower side, and the particles gradually become smaller and dry by contact with the hot air. Therefore, the sludge 10 which is finally pulverized and sorted and discharged downward has a water content of 10% or less .

An example of drying the sludge using the hot air dryer according to the present invention is shown in Table 1 as follows.

division Sludge particle size Moisture content after drying Drying time Pile height One 5mm or more 19.9% 2 hours 30 minutes 80Cm 2 2mm ~ 5mm or less 8.3% 2 hours 30 minutes 80Cm 3 2 mm or less 4.7% 2 hours 30 minutes 80Cm

* Water content of sludge 44.3%

Table 1 shows an experiment in which the water content was 44.3% by mixing raw sewage sludge (moisture 80%) and dried sewage sludge (moisture 9%).

As shown in the experimental results, it can be seen that the smaller the particles of the sludge 10 to be dried, the higher the drying efficiency is.

Accordingly, it has been found that the sludge 10 particles of the object to be dried can be efficiently dried by sequentially pulverizing and sorting the particles in the drying process.

The reference numeral 54 is a support plate for integrally connecting the cylindrical drum 50 and the rotary shaft 55. In addition, the perforations 53 in the support plate 54 are holes for allowing the hot air to flow smoothly to dry the sludge.

While the present invention has been described in connection with what is presently considered to be preferred embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments. In addition, it is a matter of course that various modifications and variations are possible without departing from the scope of the technical idea of the present invention by anyone having ordinary skill in the art.

10. Sludge 20. Housing
21. Inlet 22. Outlet
30. Hot Air Inlet 40. Rotary Cub Crusher
50. Cylindrical drum 51. Sludge falling space
52. Selecting ball 53. Through hole
54. Support plate 55. Rotation axis
60, a warp guide plate 70, a hood device

Claims (7)

A housing 20 having an inlet 21 formed at an upper portion thereof for introducing the sludge 10 and a discharge port 22 for discharging the dried sludge 10 in a conical shape at a lower portion thereof,
A hot air inlet 30 formed at a lower side of the housing 20 for introducing hot air into the housing 20,
A rotary crib crusher 40 is provided in which a plurality of sludges 10 injected into the housing 20 are horizontally formed at a horizontal interval L1 so as to be crushed and sorted, And,
The rotary sieve crusher 40 includes a plurality of perforated sorting holes 52 for selectively flowing the pulverized sludge 10 and a plurality of sludge blasting units 52 for dropping the sludge 10, A cylindrical drum 50 having a sludge dropping space 51 formed therein,
A support plate 54 integrally joined to support the cylindrical drum 50 on both sides thereof and having a plurality of apertures 53 formed therein,
And a rotating shaft 55 coupled to the supporting plate 54 to rotate the cylindrical drum 50 so that the cylindrical drum 50 can rotate forward and backward,
A second stage to a third stage are further formed on the lower side of the rotary cube crusher 40 formed at the inner end of the housing 20 with intervals therebetween and the horizontal interval of the rotary cube crusher 40 L1, L2, and L3 are spaced at intervals of 5 mm for the first stage, 3 mm for the second stage, and 1 mm for the third stage,
The slope induction plate 60 is formed on both sides of the plurality of rotary ceviv crushers 40 and connected to the inner surface of the housing 20 so that the sludge is divided into horizontal To be guided to the intervals (L1, L2, L3)
In order to dry the water content of the sludge 10 to 10% or less, the hot air introduced into the hot air inflow port 30 is at a temperature of 130 ° C. to 280 ° C.,
The high-function sludge hot air dryer (10) according to any one of claims 1 to 3, wherein the passing speed of the hot air on the surface of the sludge (10) is from 2 to 20 cm / sec while moving from the lower side to the upper side of the housing . delete delete delete delete delete The method according to claim 1,
And a hood unit (70) is installed on the upper side of the housing (20) so as to collect the steam exhaust gas, so that the hood unit (70) is discharged.

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