KR101210376B1 - Module type drying apparatus - Google Patents

Abstract

PURPOSE: A modulated drying apparatus for organic waste treatment is provided to uniformly transfer heat to a drying unit by increasing the contact side of a target and the inner side of the drying unit. CONSTITUTION: A modulated drying apparatus includes a module container(10), a heat media circulating unit, and a pulverizing and transferring unit. In the module container, the cross section of a sealed dual wall with interposed supporting plates is in U shapes. The module container includes an introducing unit(13), a draining unit(14), and an exhaustion unit. The exhaustion unit exhausts air containing moisture. The heat media circulating unit includes a heat media heating part, a circulating part, and a heat media circulating pipe. The circulating part circulates heated heat media to the heat media flow path of the module container. The pulverizing and transferring unit includes a transferring screw(31) and a screw driving part(32).

Description

Modular type Drying Apparatus for organic waste treatment such as sewage sludge or food waste

The present invention relates to a drying apparatus for treating sludge containing a large amount of water, and more specifically, to organic and inorganic sludge, which is waste generated at various industrial sites, sewage treatment plants, homes and houses, etc. The present invention relates to a modular drying apparatus for treating sludge and characterized in that it can be dried and treated.

In the present invention, it is assumed that the dry object is a sludge waste, but this does not limit the use area (type of dry matter) of the drying system according to the present invention.

After treating wastewater generated in various industrial sites such as sewage treatment plants, food waste treatment plants, food factories, textile and paper mills, and livestock farms, a large amount of oil and inorganic sludge such as residues and manure are generated. At this time, the sludge has a water content of about 60 to 85%.

When the high water content sludge is buried as it is, the volume is large and the transportation cost is increased, and the landfill volume is also occupied largely, and the large amount of leachate causes pollution of soil and groundwater as well as environmental pollution. Therefore, most sludges are dehydrated or dried below a certain moisture content and then treated by incineration, recycling, landfilling, and dumping at sea. However, the international treaty prohibits marine dumping of sewage sludge and livestock manure (since 2012), wastewater and food waste (since 2013), and direct landfill sludge from sewage treatment plants for more than 10,000 tons / day. . Therefore, the treatment method of sludge is very limited.

Sludge is dehydrated and dried to less than about 10-40% of its moisture content, which is worth recycling as a raw material for combustion or fertilizer or feed. Therefore, the technology for drying and recycling sludge is considered to be an attractive sludge treatment method because it is economical with the increase of energy cost of petroleum and there are few secondary problems such as odor, and it can be landfilled because it meets the standard value as landfill. have. Accordingly, various drying apparatuses have been developed in the meantime, but there is still a lack of uniform quality, utilization technology and facilities such as thermal efficiency, level of drying capacity, and efficient treatment of secondary materials generated during drying process. There is a need.

Drying of sludge can be classified into hot air (drying room) type, heat conducting (drying room) type, and microwave heating method, and hot air type and heat conducting type have been put to practical use in terms of suitability for mass processing.

Hot air type is to inject combustion gas such as heavy oil and LPG, that is, high temperature dry gas (about 300 ~ 450 ℃) directly into the drying space, or hot air generated by hot air generator or heat exchange without directly injecting combustion gas (dry Gas) is injected into the drying space. The thermal conductivity is a method of drying an object to be dried by heat conduction on the surface of the metal plate by contacting with a metal plate or the like instead of directly contacting the hot air or heat medium with the object to be dried.

On the other hand, the drying efficiency of the dryer is mainly determined by the speed of heat transfer to the dry matter, i.e., how large the specific surface area the dry matter is in contact with the heat conducting medium (hot dry gas in the hot air type, hot metal plate in the heat conduction type) . Of course, ② How hot is the heat-conducting medium? ③ How quickly the air containing moisture evaporated during the drying process can be discharged, and the residual heat in the exhaust air can be recovered and efficiently recycled. It is possible to control, so leave it out.

Therefore, in theory, hot air, in which hot dry gas is in direct contact with the dry matter, is most suitable for drying sludge containing high moisture. However, in the case of treating a large amount of sludge, only the surface of the dry matter mainly in contact with the high temperature dry gas is dried, which causes a heat transfer to the inside. Therefore, to prevent this, there is a need for a separate apparatus capable of properly crushing sludge during drying. In addition, in order to evenly eject the hot dry gas to the dry matter, a large number of air ejecting holes and, in some cases, a screw hollow shaft and a prevention plate for preventing the blockage of the drying apparatus must be provided. There is a disadvantage that is not easy. In addition, some of the dry matter directly contacted with the hot dry gas ejected from the air blowing hole is excessively carbonized, which reduces the drying efficiency. The phenomenon of disappearing also occurs.

In Patent Publication No. 10-2000-0058640, the pipe 34 is wound into a drum shape, and the tip and end portions of the pipe 34 are connected to the boiler 50 to be heated to heat the boiler 50 (fluid). Heat transfer drying apparatus for drying the sludge by rotating the inner cylinder 30 and the transfer screw 31 at the same time by installing the transfer screw 31 in the center of the inner cylinder 30 to allow the circulation circulating (Fig. 1a) is disclosed. . However, according to this, the manufacturing process is very complicated and it is very vulnerable to impact during operation, such as winding the pipe to form a drum and precisely brazing between the pipes. Impossible]

Patent Document 10-2001-0109699 has a heating chamber 12 connected to the boiler 11 below, a heating chamber 13 provided at an upper portion of the heating chamber, filled with water, and heated at the upper portion of the heating chamber, and installed in the motor 14. It relates to a drying apparatus 10 including a conveying screw 15 is provided with a feed wing 15a at the tip to sequentially convey the object injected while rotating by (Fig. 1b).

However, since the drying apparatus uses water as a medium, not only the operating temperature is low but also the heat transfer efficiency is low, and thus there is a limit in treating a large amount of dry items.

Patent No. 10-0594937 has a treatment tank 11 for receiving food waste transported through a hopper 17 and a conveyor 19 therein, and is provided in close contact with a lower portion of the treatment tank 11 and supplied from the outside. A food waste fertilizer is disclosed that includes an oil jacket 21 that generates heat as the high temperature oil passes through the inside thereof, and an oil circulating unit that heats the oil to circulate the inside of the oil jacket 21 (FIG. 1c). The oil jacket 21 has an oil flow passage 21a extending in a predetermined pattern like a heating pipe, so that the oil heated by the boiler 39 passes through the oil flow passage 21a to heat the oil jacket 21. The oil jacket 21 heats the treatment tank 11. However, according to this structure, the thermal conductivity of the oil jacket 21 is low (hence, quick lime is added in addition to the primary drying by heat transfer of the oil jacket, and the secondary drying is performed by exothermic reaction of quicklime), and the oil jacket 21 is treated in the tank By installing only in the lower part of (11), mechanical fatigue phenomenon such as distortion of the treatment tank or fatigue cutting occurs during use due to repeated thermal expansion difference between the lower part and other parts.

On the other hand, the conventional drying apparatus is fixed in the processing capacity in the mid-to long-term operation process, if the amount of the dry matter is less than the processing capacity, the waste occurs in the operation, if it exceeds the processing capacity, if replaced with a large capacity drying apparatus or However, there is an inevitable need to install additional drying units of considerable scale (for future growth).

Patent Publication 10-2000-0058640 Patent Document 10-2001-0109699 Patent Registration 10-0594937

An object of the present invention is to provide a drying apparatus of a thermally conductive drying method which is excellent in contact efficiency with a dry matter and prevents mechanical fatigue of the drying apparatus due to partial (partial region) thermal conduction.

It is another object of the present invention to provide a compact modular drying apparatus that is easy to install and repair.

In addition, an object of the present invention is to provide a drying apparatus that prevents carbonization of the dried product by crushing the dried product at the same time as the pad rotates at a high speed in the drying apparatus and drying it to the reflected heat.

In order to achieve the above object, the present invention provides a U-shaped unidirectional cross section of a sealed double wall in which a blocking support plate is interposed so that a heat medium flow path reciprocating in a long direction or a unidirectional direction is formed when (A) the plane is unfolded. A module container including an inlet and outlet means formed on one side of the end and one side of the discharge end, and an exhaust means for exhausting the humidified air therein; (B) a heat medium circulation device including a heating part for heating the heat medium, a circulation part for circulating the heated heat medium in the heat medium flow path of the module container, and a heat medium circulation pipe; (C) shredding conveying apparatus of a one-way cross-section comprises a screw driver for rotating the feed screw, and a conveying screw mounted on the semi-circular trader the module class and coaxially constituting the when the interior of the vessel; and a modular drying apparatus including, this speech The modular assembly drying system and its operation method .

As described above, according to the present invention, the dry matter is crushed and transferred at the same time by the screw, and the contact surface with the inner surface of the high temperature drying apparatus is increased to dry quickly and efficiently.

In addition, according to the present invention, since the heat is evenly transmitted to the entire drying apparatus, the heat transfer efficiency is also excellent, and the mechanical fatigue phenomenon of the drying apparatus is greatly reduced, thereby increasing the service life of the apparatus.

In addition, according to the present invention, it is easy to install because the small number of modules to modify the number of speeches to configure the drying system, even if there is a problem in the module, it is easy to maintain only because the module is replaced immediately.

In addition, according to the present invention, not only the drying treatment process can be easily adjusted according to the amount, type or condition of the dry matter, but if the amount of the dry matter increases, it is possible to flexibly change the drying treatment capacity by adding a module. .

1a-1c show a part of a drying apparatus according to the prior art;
2A is a conceptual plan view (A), a front sectional view (B), a right side view (C) and a left side view (C) of an example of a modular drying apparatus according to the present invention.
Figure 2b and Figure 2c is a front photograph and a left side photograph of an example of manufacturing a modular drying apparatus according to the present invention.
Figure 3 is a cross-sectional view (A), side view (B) and expanded conceptual view (C) of the module container according to the present invention.
Figure 4a is a drawing of the transfer screw is a paddle type in the modular drying apparatus according to the present invention and a production example.
Figure 4b is a side view and a right side view of the transfer screw is another paddle type in the modular drying apparatus according to the present invention.
5 is an exemplary plan view (A), conceptual front view (B) and side view (C) of a modular drying system according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the appended drawings illustrate only the contents and scope of technology of the present invention, and the technical scope of the present invention is not limited thereto. In addition, it will be apparent to those skilled in the art that various modifications and changes can be made within the scope of the present invention based on these examples.

The present invention relates to a modular drying apparatus for efficiently drying dry matter containing a large amount of liquid components, for example, food waste of high water content, organic-inorganic sludge, and a modular assembly drying system in which it is addressed, and a method of operating the same . will be.

<Modular Drying Equipment>

In the present invention, the modular drying apparatus is a shredded dry matter in the interior of the module container 10, the heat medium circulation device 20 for supplying heat for drying, and the module container 10 in which the drying phenomenon of the dry matter occurs. It is comprised including the shredding conveyance apparatus 30 which stirs and conveys. 2A is a conceptual plan view (A), a front sectional view (B), a right side view (C) and a left side view (C) of an example of a modular drying apparatus according to the present invention, and FIG. 2B and 2C according to the present invention. The front photograph and the left side photograph of the drying apparatus manufacturing example are shown.

① The module container 10 functions to evaporate the moisture contained in the dry matter by the heat of the heat medium supplied by the heat medium circulation device 20 when the dry matter is introduced through the input means 13 of the front side (input end). In other words, it is a closed container with a U-shaped cross section and a long longitudinal axis. 3 shows a cross-sectional view (A), a side view (B) and an unfolded conceptual view (C) of the module container 10 according to the present invention.

The U-shaped sidewall of the module container 10 is a sealed double wall 12 structure in which a heat medium flow path is formed. That is, the closed double wall 12 has a blocking support plate 11 interposed therebetween so as to form a heat medium flow path reciprocating in a longitudinal direction or a unidirectional direction when unfolded in a plane (FIG. 3C). The structure is curved in shape. In this case, the heat medium flow path may be linear, that is, the flow path may flow in one direction without being joined or branched, or may flow in at least two directions. In FIG. 3, as shown in (C), although the linear flow path is formed in the longitudinal direction of the sealed double wall 12, it is also possible to form the flow path in one direction (i.e., perpendicular to the flow in the long direction) (not shown). ). It will be apparent that the width of the flow path and the space between the sealed double walls 12 can be appropriately selected according to the size of the module container 10 or the characteristics of the object to be processed.

The module container 10 includes an input means 13 for supplying a dry object containing a liquid component, a discharge means 14 for discharging the dried object from an internal space, and an exhaust means for exhausting the humidified air therein. Is installed. As the exhaust means is generally adopted in the art, it may be composed of the exhaust hole and the exhaust fan connected thereto so that the detailed description or drawings are omitted.

In the present invention, the (internal) standard of the module container 10 is the diameter of the semicircle forming the inner surface of the module container 10 for convenience of manufacture and installation at the same time as the contact area with the dry object for heat transfer It is preferable to design narrow and long so that the upper width (lateral width) may be 0.3-0.7 m, height 0.5-1.0 m, and a longitudinal direction 4-10 m.

② The heat medium circulation device 20 ((C) in FIG. 2C) functions to heat the heat medium in various ways and to supply and recover the heat medium to the heat medium flow path of the module container 10, that is, to dry the dried material. It provides the latent heat of evaporation so that the liquid component (hereinafter simply referred to as 'moisture') contained in the dry matter can evaporate. The heat medium circulation device 20 includes a heating part for heating the heat medium, a circulation part for circulating the heated heat medium in the heat medium flow path of the module container 10, and a heat medium circulation pipe.

For example, the heat medium circulation device 20 includes a boiler (heating unit) for heating a heat medium while burning a predetermined fuel, a circulation pump (circulating unit) for circulating the heated heat medium, and the module container 10. It may be composed of a tube (heat medium circulation tube) in communication with each end of the heat medium flow path of (not shown). Oil may be used as the heat medium in the present invention, the temperature of the oil heated in the heating unit is preferably about 170 ~ 250 ℃.

(C) of the photograph shown in FIG. 2C is a heat medium circulation device 20. The heat medium circulation device 20 itself is not a core matter of the present invention and can be appropriately selected and applied by those skilled in the art, and thus further detailed descriptions and accompanying drawings will be omitted.

③ The shredding transfer device 30 functions to shred, stir, and transfer the dried product, thereby properly shredding, stirring, and dispersing the dried material and the module container (10) without a separate shredding / stirring means. By increasing the contact surface of the inner wall of the) to allow the object to be moved / dried. Moisture air generated in this process is quickly discharged to the outside by the exhaust means of the module container 10 is more active evaporation of moisture.

The shredding conveying device 30 is a screw pin at a predetermined position, interval and angle on a rotating shaft installed coaxially with a semicircle (arc) constituting the inner surface of the module container 10 having a unidirectional cross section having a semicircle (arc) shape. It comprises a feed screw (31) or a paddle 34 is mounted, and a screw driver 32 for rotating the feed screw (31). 2A and 5 illustrate a transfer screw 31 equipped with a conventional screw pin 33, but as shown in FIG. 4A or 4B to more effectively crush, stir and transfer the dried object. It is preferable to apply the transfer screw 31 in which the pads are mounted at two pitches to the screw shaft.

In the transfer screw 31, the space between the outer end of the screw pin 33 or the paddle 34 and the inner wall of the module container 10 is minimized so that the construction of the dried product can be crushed, stirred and transported smoothly. desirable. Furthermore, a plurality of protrusions may be formed on the inner wall of the module container 10 so that the crushing and stirring of the dry matter can be made better (not shown).

In addition, it is also preferable to arrange the heat medium circulation tube inside the rotating shaft of the transfer screw 31 and to connect the heat medium circulation device 20 so that heat transfer can also be performed through the surface of the transfer screw 31 (not shown).

On the other hand, although the moisture evaporated from the dry matter is rapidly removed by the exhaust means by the heat transferred from the heat medium, the additional supply of heat to the dry matter to be shredded, stirred, and transported to promote the flow of air increases the evaporation efficiency. It is preferable to increase.

To this end, it is possible to add a hot air supply device for supplying high-temperature dry air inside the module container (not shown). In the present invention, since the hot air supply device is to assist the heat supply by the heat medium, there is no need to install an air blowing hole-blocking plate on the inner surface of the module container 10 in direct contact with the dry matter, unlike the conventional hot air type. That is, in the present invention, the hot air spray unit for injecting hot air downward from the upper portion of the inside of the module container 10 which is not touched by the building during the operation is installed in the whole or part of the longitudinal direction of the module container 10. To this end, a compressed heating unit for generating hot air and a hot air supply pipe for transferring hot air to the hot air spraying unit are additionally installed.

Since the hot air supply device itself is not a core matter of the present invention and can be appropriately selected and applied by those skilled in the art, further detailed description or accompanying drawings will be omitted.

<Modular Assembly Drying Equipment and Operation Method>

The present invention is easy to install, and even if there is a problem with the module, only the module having a problem is replaced immediately, so that easy maintenance, the modular assembly drying system in which two or more of the above-described small modules are addressed. It is about. In this case, of course, the discharging means 14 of the modular drying apparatus of the front end and the input means 13 of the modular drying apparatus of the rear end are directly connected. In addition, it is also natural that one of the heat medium circulation device 20 or one hot air supply device can supply heat medium and hot air to the plurality of module containers 10. 5 shows an exemplary plan view (A), a conceptual front view (B) and a side view (C) of a modular drying system in which seven modular drying devices are addressed. In the drawing, illustration of the heat medium circulation device 20 and the hot air supply device is omitted.

A module container 10 having a diameter of 0.5 m, a height of 0.6, and a longitudinal direction of 6 m is formed as shown in FIG. 250kg in continuous It was confirmed that normal food waste can be treated by 40 tons in 20 hours by operation (see Examples and Virtual Examples below).

On the other hand, although the shredding transfer device 30 of the modular drying device effectively crushes, stirs, and transfers the dry items, depending on the type of dry goods (particularly dry matters having fine and even particles such as sewage treatment sludge), As it passes through the mold drying device, a ball-shaped intermediate treatment is made, in which the outside is dried and a lot of moisture remains inside. In this case, the drying efficiency tends to suddenly decrease. Therefore, in the modular assembly drying system according to the present invention, it is preferable that the dry matter pulverizing device is interposed at one or more places between the modular drying apparatuses (not shown). For example, in the modular drying system configured as described above, in the fourth to fifth modular drying apparatuses, the water content tends to become ball with about 50% of water content, so that the grinding is performed between the fourth and fifth or between the fifth and sixth. It is good to add a device.

When the operation of the modular assembly drying system according to the present invention goes to the rear end, the water content of the dry matter is reduced, and thus the operation load of the modular drying device is reduced while the volume and weight of the dry matter are rapidly reduced. Therefore, if all the operation conditions of the modular drying equipment are the same, it causes a waste of resources.

In order to increase the efficiency of the modular assembly drying system according to the present invention ① by reducing the rotational speed of the transfer screw 31 of the modular drying device of the rear end to maintain the load of the entire modular drying device evenly or ② of the modular drying device In order to maintain the load of the modular drying device uniformly, the sludge inlet is adjusted to be lower than the outlet to secure the sludge dwell time. It is desirable to.

Example

The module container 10 is equipped with a module container 10 having a diameter of 0.5 m, a height of 0.6 and a longitudinal direction of 6 m, and a 150 Kw HM boiler so that 1.50,000 kcal can be supplied per hour. Drying experiment was performed using the heat medium circulation device 20.

The structure of the conveying screw 31 in the module container 10 was a 2-pitch paddle 34 type shown in Fig. 4a. The dry matter discharged to the discharge means 14 while the dry matter is put into the feeding means 13 of the module container 10 and the residence time is operated for 6 minutes is temporarily transferred to the conveyor 31 (see FIGS. 2B and 2C). The experiment was carried out in such a manner that it was immediately put back into the feeding means 13 through B)). The apparatus for the experiment was configured as shown in Figure 2b and 2c, in the photo (A) is a module container (10), (B) a temporary transfer screw 31 for the experiment, (C) is a heat medium circulation device (20) )to be. In view of the fact that the input means 13 and the discharge means 14 are open and the object to be exposed is temporarily exposed to the outside, the exhaust means is omitted from the mounting.

Samples were taken every predetermined time while drying experiments were conducted on the dry matters of various types and moisture content, and the results are shown in the following table. The heat medium (oil) temperature supplied was 185 ° C for the first dry matter and 205 ° C for the rest.

As can be seen from the table, according to the modular drying apparatus according to the present invention, food waste can be dried within 8 to 12% water content within 80 minutes, and sewage sludge can be dried within 60% in 30 to 40 minutes. It was confirmed. This is because in the experiment process, it was possible to dry the high moisture content of the dried product in an unfavorable condition that inevitably exposes the dry matter to the outside every 6 minutes for 20 seconds, thereby reducing the temperature of the dried material. It can be expected that even better results will be obtained in the modular assembly drying system according to the present invention produced by speech.

email Example

Using the results of the above-described examples as data, the modular drying apparatus of the same standard as shown in FIG. 5 is shown in FIG. 5, and the results predicted during the drying experiment are shown in the following table.

The working volume of the modular drying apparatus (hereinafter referred to as 'module') was adjusted to the residence time of each module to be 390L, which is 1/3 of the total volume. 50 tons of food (dehydrated cake) having a water content of 75% by 20 hours of operation each day was subjected to a batch of 250 kg of dry matter every 6 minutes. The boiler capacity of the heat medium circulation device 20 was 1.2 million kcal per hour.

In this case, as can be seen in the above table, according to one example of the modular assembly drying system according to the present invention, the total residence time is 72 minutes by discharging 71Kg of dry matter every 6 minutes to 70% or more drying and 10% moisture content It can be seen that it is possible to treat a large amount of dry matter (50 tons / day) very efficiently.

10. Module Container
11. Blocking support plate 12. Sealed double wall 13. Input means
14. Discharge means
20. Heating medium circulation device
30. Shredding transfer device
31. Feed screw 32. Screw drive part 33. Screw pin
34. Paddles

Claims (7)

(A) The unidirectional cross-section of the sealed double wall, which is interposed with the blocking support plate, is formed in a U-shape so that when it is unfolded in a plane, a heat carrier channel reciprocating in a longitudinal direction or a unidirectional direction is formed, and on one side of the input end and one side of the discharge end, respectively. A module container including formed means for inputting and discharging means and exhausting means for evacuating moisture inside the air;
(B) a heat medium circulation device including a heating part for heating the heat medium, a circulation part for circulating the heated heat medium in the heat medium flow path of the module container, and a heat medium circulation pipe;
(C) a shredding conveying device including a conveying screw installed in a longitudinal direction coaxially with a semicircle constituting the inner surface of the module container having a unidirectional cross section and a screw driver for rotating the conveying screw;
Modular drying apparatus comprising a.
The method of claim 1,
Modular drying apparatus, characterized in that the conveying screw is formed by two pitches.
The method of claim 1,
And a hot air supply unit including a hot air spray unit for spraying hot air downward from the upper side wall of the module container, a compressed heating unit for generating hot air, and a hot wind supply pipe for transporting hot air to the hot air spray unit . Modular drying equipment.
The modular drying system, characterized in that at least two of the modular drying apparatus according to any one of claims 1 to 3.
The method of claim 4, wherein
And a dry matter pulverizing device is interposed between at least one of said modular drying devices.
The method of claim 4, wherein
Module assembly type drying system, characterized in that one heating medium circulation device or one hot air supply device is applied to a plurality of module containers. The method of operating the modular assembly drying system according to claim 4, wherein the feed screw rotation speed of the rear end modular drying apparatus is reduced, or the height of the inlet side and the outlet side of the rear end modular drying apparatus is adjusted. .

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