KR20140096494A - Dryer with cyclone using indirect heating method and dry system having the same - Google Patents

Abstract

The present invention relates to a dryer with a cyclone using an indirect drying method which has the drying efficiency increased during the process of drying an object to be dried via a heating medium, can have the flowing characteristics in the dryer improved, and can discharge the object to be dried definitely. The present invention provides a dryer with a cyclone, comprising: a casing having a space formed therein including an input part to input an object to be dried, and a discharge part formed on a lower side in the middle to discharge the object to be dried; a first heat medium filled into the space inside the casing and mixed with the object to be dried; a churner arranged inside the casing to generate rotating flow by churning the first heat medium; a heat medium circulating part arranged inside the casing to transmit heat to the first heat medium; and a second heat medium flowing in the heat medium circulating part. The heat medium circulating part evaporates moisture by transmitting heat to the object to be dried. The object to be dried, which has a specific gravity thereof increased in a drying process, has moisture content thereof minimized by moving to the inner side wall of the casing via centrifugal force and moving to the lower side of the space inside the casing while rotating spirally via gravitational and centrifugal force, and is discharged through the discharge part. Therefore, the object to be dried can stably and efficiently be dried, and the dried object can definitely be separated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an indirect drying cyclone drying apparatus and a drying system using the indirect drying cyclone drying apparatus,

The present invention relates to a drying apparatus, and more particularly, to an indirect drying method in which drying efficiency is increased in a step of drying a drying object through a heating medium, flow characteristics in the drying apparatus are improved, To a cyclone drying apparatus and a drying system having the cyclone drying apparatus.

Generally, sludge (sludge) refers to a state in which pollutants have settled in the sewage / sewage in general households or industries. Sludge may be generated by artificial sedimentation during the treatment of wastewater discharged from chemical plants or dye / pigment plants, or by natural sedimentation in rivers and lakes. Particularly, in a wastewater treatment process in a factory or the like, biological sedimentation or coagulation sedimentation is carried out to purify wastewater by promoting sedimentation of sludge, which is one of important processes in wastewater treatment.

These sludges are generally classified as organic wastes because they contain organic materials that can be decomposed by microorganisms. In the past, the sludge generated in the wastewater treatment process was collected periodically, for example, by a rotary drying method such as a rotary kiln dryer to reduce the predetermined amount of water, and then to treat it in the ocean. However, since the possibility of increasing the environmental pollution is high in the case of organic sludge, the prohibition of marine dumping is proposed by the London Convention and the marine dumping of wastes such as sewage sludge and food waste is recently prohibited in Korea.

Conventionally, a method of treating sludge in a manner of incineration has been widely used. Recently, there is a need for recycling, and there is an increasing demand for technologies for fuel conversion and resource conversion. Therefore, the present invention focuses on a method of recovering and recycling energy more efficiently than a simple solidification level of the conventional sludge drying method.

The sludge drying method is divided into a direct drying method and an indirect drying method based on the heat transfer method. The direct drying method is a method in which a high temperature heat medium comes into direct contact with the sludge and the sludge is dried by the convection of the combustion gas. Is high and the processing speed is fast, but there is a problem of exhaust gas treatment and dust explosion. The indirect drying system has the advantage of reducing the exhaust gas and the heat loss by reducing the moisture by allowing the heat medium of high temperature to indirectly exchange heat with the sludge through the predetermined heat transfer means, And the drying speed is lowered.

In recent years, in-stream drying techniques have been proposed in which sludge and oil are mixed and dried. In this drying technique, the drawbacks of the drying methods can be partially compensated in terms of fluidity and heat transfer area of the sludge.

However, in the conventional oil drying technique, a separate process is required to separate the oil. In general, the process of heat transfer or post heat is required, resulting in excessive equipment and energy consumption. In addition, since oil and sludge are mixed together and discharged together, they may be discharged without being dried properly in the dryer, and may adhere to and adhere to the dryer, thereby deteriorating durability and efficiency.

SUMMARY OF THE INVENTION The present invention has been made in order to overcome the problems of the prior art described above, and it is an object of the present invention to provide a method and a device for drying a drying object such as sludge through a predetermined heating medium, And a drying system having the cyclone drying apparatus.

According to an aspect of the present invention, there is provided an indirect drying cyclone drying apparatus comprising: a casing having a charging unit for forming a space therein, a discharge unit for discharging a dried material, A first heat medium which is filled in a space inside the casing and mixed with the object to be dried, an agitator which is disposed inside the casing and generates a rotational flow by stirring the first heat medium, And a second heat medium circulating in the heat medium circulation part, wherein the heat medium circulation part conveys the heat of the second heat medium to the drying object to evaporate moisture, Is moved to the inner wall side of the casing by the centrifugal force and is spirally rotated by gravity and centrifugal force, And the dried material moving to the lower side of the casing inner space and having the lowest moisture content is discharged through the discharge portion. Therefore, stable and efficient drying of the dried product can be achieved, and the dried product can be surely separated.

In the indirect drying cyclone drying apparatus of the present invention, the heat medium circulation portion is formed in a coil shape and is disposed so as to surround the agitator, and the first heat medium is circulated through the space between the coil pitches of the heat medium circulation portion, So that the heat transfer contact with the heat medium circulation part can be increased. Therefore, the thermal efficiency is maximized and the productivity is improved.

In addition, during the flow of the first heat medium, the outer surface of the heat medium circulation unit may be continuously cleaned to prevent scale formation. Therefore, the maintenance cycle is remarkably shortened and the problem of the decrease in efficiency is prevented

Further, the flow rate of the first heat medium can be increased while passing through the space between the coil pitches of the heat medium circulation part. Therefore, the vortex is effectively generated and the dried product, which has been dried, can be effectively separated.

In addition, the first heat medium may be composed of one or more substances selected from waste cooking oil, ionic refining oil, B-C oil and mineral oil.

In addition, the second heat medium may be made of any one material selected from steam, exhaust gas from a combustor, and oil.

Further, the indirect drying cyclone drying apparatus of the present invention may further include a heating device for heating the second heating medium.

In addition, the indirect drying type cyclone drying apparatus of the present invention may further include a condenser for condensing the water evaporated from the drying object into a liquid phase.

The indirect drying cyclone drying apparatus of the present invention may further include a solids separation device for separating the first heat medium mixed in the dried matter discharged from the discharge section.

Further, the heat medium circulation part may be formed so as to be adjacent to the inner wall side of the casing.

On the other hand, in the drying system including the indirect drying type cyclone drying apparatus, a plurality of cyclone drying apparatuses are arranged in series to sequentially dry the objects to be dried, and the heat medium circulation units provided in the respective cyclone drying apparatuses communicate with each other Drying system. Therefore, the moisture content of the dried material can be minimized, and the construction for heat transfer can be simplified.

The second heating medium is circulated so as to be heated by the heating device and heat-transferred in the plurality of cyclone drying apparatuses. The second heating medium flowing at a high temperature is heat-transferred to the drier, The heating medium can transfer heat to a relatively dry, less dry material. Thus, the efficiency of heat transfer and drying is maximized.

In addition, with respect to the arrangement of the plurality of cyclone drying apparatuses, the moving direction of the laundry and the second heating medium in the drying process are preferably opposite to each other.

INDUSTRIAL APPLICABILITY The indirect drying cyclone drying apparatus and drying system according to the present invention having the above-described structure can effectively dry the laundry by the first heating medium, so that the effect of drying can be maximized while using less energy have.

In addition, since the effect of dispersing and separating the laundry is effectively increased by using the indirect drying type cyclone type dryer, the effect of the dispersion and separation is further increased by the coil-shaped heating medium circulation part. Therefore, And the like can be omitted, so that the economical efficiency can be further improved.

In addition, since the first heat medium and the drying object are repeatedly moved through the space between the coil pitches of the heat medium circulation part, efficiency reduction due to the formation of scale in the heat exchange part is prevented and vortex generation is more effectively performed due to the difference in flow velocity Therefore, there is an effect that separation of the dried material can be more surely performed.

In particular, when the drying apparatus and the drying system of the present invention are compared with the conventional simple drying method, the dried material can be used as a high-quality recycled fuel.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side cross-sectional view showing a cyclone drying apparatus of indirect drying type according to the present invention. FIG.
Fig. 2 is a side sectional view showing a modification of Fig. 1; Fig.
3 is a conceptual diagram showing the drying system of the present invention.

Hereinafter, an indirect drying type cyclone drying apparatus and a drying system having the cyclone drying apparatus according to the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side cross-sectional view showing an indirect drying type cyclone drying apparatus according to the concept of the present invention; FIG.

The cyclone drying apparatus 100 according to the present invention basically comprises a casing 110 which forms a space therein and into which a drying object is introduced and stirred and dried and discharged, A stirrer 120 for generating a rotational flow by stirring a mixture of the first heating medium 141 and the drying object, a heating medium circulating unit 130 for transferring heat to the drying object, a heating medium circulating unit 130, and discharges heat to the object to be dried.

Here, the drying object to be dried is not necessarily limited to the sewage sludge, but may include various drying objects such as the vegetable processed product and the fried food.

The casing 110 forms a predetermined space so that the drying object can be stirred, dried and discharged in the space inside the casing 110. As will be described later, the rotational movement of the object to be dried and the first heating medium 141 is generated, It is preferable that the shape due to the inner wall is formed substantially in the form of a cylinder or a corn. However, the shape of the casing 110 may be variously selected.

The casing 110 may have a predetermined opening through which the object to be dried may be introduced and discharged and moisture may be discharged. Accordingly, the casing 110 may include a charging unit 121 for charging the object to be dried, And a water outlet 123 through which moisture evaporated from the object to be dried by heat transfer is discharged to the outside. As shown in the drawing, the charging unit 121 is provided on the upper side of the casing 110 in consideration of charging by its own weight, and the water outlet unit 123 is provided in the casing 110 in consideration of the discharge of moisture of the vapor phase. And the discharge portion 122 is provided on the lower side of the upper portion 110 to discharge the dried object to be dried due to the difference in specific gravity as described later, but the present invention is not limited thereto.

In the description of the present invention, a drying object to be introduced by the input unit 121 is defined as an object to be dried, and a drying object to be discharged from the discharge unit 122 is defined as a dried material, It can be understood that it means the state of the object to be dried with a relatively small amount of moisture. As will be described later, in a state in which a plurality of drying apparatuses are arranged in series, a state of being discharged from each drying apparatus can be defined as a dried body, and a state of being discharged from the final drying apparatus can also be expressed as a dried body.

The first heating medium 141 refers to a fluid that is filled in the casing 110 and mixed with the drying object to maximize heat transfer. Preferably, the first heating medium 141 can use oil in consideration of the boiling point of the first heating medium 141, the specific gravity difference, and the heat transfer efficiency. In this case, the first heating medium 141 can be understood as the in-air drying method.

The first heating medium 141 may be selected from among vegetable oils such as waste cooking oil, ionic refining oil or BC (Bunker-C) oil, and one of the minerals may be selected and used. It may be mixed and used.

In the case where the first heating medium 141 is made of oil as described above, since the oil has a boiling point higher than that of water during the process of evaporating moisture from the drying object due to the heat of the inside, the heating is performed at the temperature between the boiling point of the oil and water When the drying is performed, the drying object is transferred from the oil surrounding the drying object, and only water can be evaporated quickly.

Also, since the first heating medium 141 and the drying object are mixed and agitated, the fluidity is increased and the heat transfer area is widened, so that the drying efficiency can be increased. At this time, since the rotating flow is generated by the stirrer 120, this drying process occurs more systematically inside and the dried material can be effectively discharged, which will be described later.

The amount of the first heating medium 141 filled in the casing 110 may be determined in consideration of the mixing ratio with the laundry. If the ratio of the first heating medium 141 is low, the specific gravity of the laundry generally becomes high The ratio of the amount of the first heating medium 141 to the material to be dried depends on factors such as the amount and the specific gravity of the flow by the stirrer, . ≪ / RTI >

The stirrer 120 is disposed inside the casing 110 to mix the first heating medium 141 and the drying object to generate rotating flow. Such an agitator may include an impeller for generating a rotational flow as shown in the figure, a rotational shaft (not shown) serving as a rotational center of the impeller, and a driving unit (not shown) for providing rotational power. The arrangement of the rotating shafts is preferably substantially perpendicular to the center of the casing 110 in consideration of efficiency of stirring and flow generation, but is not limited thereto. In addition, the impeller generates rotational flow directly with respect to the first heating medium 141 and the object to be dried, but may have various shapes depending on the selection. In addition, the number of impellers disposed on the rotary shaft may be optionally selected.

Such a stirrer 120 generates a rotating flow in the horizontal direction based on the arrangement state of the drawing, and this rotating flow is caused by the difference in the specific gravity of the materials contained in the casing 110, A spiral flow can be induced. Drying and material separation can be performed by turning by centrifugal force. Accordingly, the present invention provides a concept of a Cyclone type drying apparatus. Specifically, vortices are generated in the cyclone inside the casing 110 due to the generation of rotating flow, and the drying is progressed due to the difference in specific gravity, thereby increasing the specific gravity. So that the separation can be progressed. In the center side where the agitator 120 is disposed, the upward swirling vortex is formed, and the dried object having relatively less dryness can be moved upward.

The heat medium circulation unit 130 is a member capable of transferring heat to the first heat medium 141 and the object to be dried. The second heat medium is circulated therein to transfer heat of high temperature and is recovered to the outside, .

The shape and arrangement of the heat medium circulation unit 130 may be variously selected. In order to maximize circulation and heat transfer area of the second heat medium, the heat medium circulation unit 130 may have a coil shape . The coil-shaped heat medium circulation part 130 is formed by machining a predetermined pipe at a predetermined pitch. The coil pitch, which is the interval between the pipe and the pipe, is determined by the viscosity of the first heating medium 141, The speed of the flow, and the like.

The heat medium circulation unit 130 may be disposed in a manner that the heat medium circulation unit 130 surrounds the agitator 120 so as to maximize an area of heat transfer inside the casing 110. Preferably, And may be spaced apart from the wall by a predetermined distance.

The first heating medium 141 and / or the laundry are repeatedly flowed through the spaces between the coil pitches in the inner and outer spaces of the circulating part 130, which are substantially cylindrical, according to the rotational flow of the stirrer 120. [ So that there is an advantage that the heat transfer time and heat transfer area can be maximized.

In addition, since the outer surface of the heat medium circulation unit 130, which is formed in a manner that a predetermined pipe is wound by flowing in the space between the coil pitches, is continuously cleaned, scale formation can be prevented. Here, the scale refers to impurities and metal oxides on the coating film adhering to the metal surface. Generally, such a scale has a relatively low thermal conductivity, thereby reducing heat transfer efficiency in the drying process, causing loss of fuel and causing corrosion do. In the conventional art, a disk-type heat transfer plate is often used in a process for heating a material to be dried. In such a case, there is a problem that the material to be sludge is adhered and fixed and the scale gradually increases. On the contrary, There is an advantage that the problem caused by the scale can be solved when the coil-type heat medium circulation unit 130 is applied and the flow is repeatedly formed inside and outside.

Meanwhile, since the cross-sectional area of the space between the first heating medium 141 and / or the drying object is narrower than other portions in the space between the coil pitches of the heating medium circulation unit 130, the flow velocity is further increased . This difference in flow rates makes it possible to generate vortex and rotational flow more effectively.

The cyclone drying apparatus 100 according to the concept of the present invention can be applied to the second heating medium circulation unit 130 as an indirect drying method As shown in FIG.

The second heat medium may be selectively made of a fluid material capable of absorbing, storing, and releasing a predetermined amount of heat. Preferably, the second heat medium may be selected from steam, exhaust gas of a combustor, or oil.

The operation of the cyclone drying apparatus 100 according to the concept of the present invention as described above will be described with reference to the operation of the cyclone drying apparatus 100 according to the present invention. And the first heating medium 141 and the material to be dried are mixed by the stirrer 120 to generate rotational flow. During the flow of the first heating medium 141 and the laundry, the heat of the second heating medium circulating through the heating medium circulating unit 130 is transferred to evaporate the moisture contained in the laundry. At this time, The fluidity of the dried material is increased and the efficiency of heat transfer is further improved to accelerate the evaporation of water. In this case, the drier having relatively more dried is disposed farther toward the inner wall of the casing 110 due to the centrifugal force, and is moved downward due to the specific gravity difference due to the relatively larger specific gravity. Therefore, the object to be dried which has been most dried can be disposed below the casing 110 and be discharged to the outside through the discharge portion 122. Accordingly, it is preferable that the discharge portion 122 is disposed at a lower side of the center of the casing 110, more preferably, the inner wall of the lower portion of the casing 110 is inclined downward, ). ≪ / RTI >

The second heat medium is introduced into the casing 110 at a high temperature through a second heat medium inlet 131 formed at one side of the heat medium circulation unit 130 to perform heat transfer to the article to be dried in the casing 110, The cyclone drying apparatus 100 of the present invention may further include a heating apparatus 200 for heating the second heating medium in the circulation process. Such a heating apparatus can be selected and used as a known fluid heating means.

The moisture evaporated from the inside of the casing 110 flows out through the water outlet 123. Since the moisture may contain the components of the laundry or the first heating medium 141, There is a concern. Therefore, the cyclone drying apparatus 100 of the present invention may further include a condenser (300 in FIG. 3) for condensing the water flowing out from the water outlet 123 and separating the condensed water into liquid phase. Such a condenser is basically a device for recovering heat of steam and liquefying it, and various condensers such as water-cooling, air-cooling or evaporation type can be applied.

The dried matter discharged from the discharge portion 122 means that the drying is relatively much progressed in the drying object as described above and may include residual moisture or the first heating medium 141, The cyclone drying apparatus 100 of the present invention may further include a solids separation apparatus (400 in FIG. 3). The solid separator may be a centrifugal separator for separating the solid material from the first heating medium 141 by centrifugal force, or may be a heating / separating device for separating and separating the first heating medium 141 by heating. Accordingly, various solid / liquid separation apparatuses can be selected or fused.

The first heating medium 141 separated from the solids separating device can be reduced to the interior of the casing 110 and reused.

2 is a side cross-sectional view showing a modified example of the indirect drying type cyclone drying apparatus.

The description of the circulation of the casing 110, the stirrer 120, and the second heating medium, etc., will not be repeated. In FIG. 2, the heat medium circulation unit 130 is formed in a coil shape and is arranged in such a manner as to surround the stirrer 120, and the radius of the heat medium circulation unit 130 is larger than that in FIG.

That is, the extension and the heat transfer area of the heat medium circulation unit 130 can be made longer and wider, and the heat medium circulation unit 130 is also disposed adjacent to the inner wall side of the casing 110, The contact frequency between the object to be dried and the heat medium circulation unit 130 is increased, which is advantageous in that the thermal efficiency can be improved as compared with the case of FIG.

The cyclone drying apparatus 100 described above may be disposed as a single unit, but a plurality of cyclone drying apparatuses 100 may be arranged so that the moisture content of the drying object may be further reduced, thereby sequentially performing the drying process.

Fig. 3 is a conceptual diagram showing a drying system in which a plurality of such cyclone drying apparatuses are arranged.

In the drying system of the present invention, the plurality of cyclone drying apparatuses 100 described above are basically arranged in series to each other to sequentially dry the laundry. In the example of FIG. 3, the cyclone drying apparatus is arranged such that the first cyclone drying apparatus 100a, the second cyclone drying apparatus 100b, and the third cyclone drying apparatus 100c are arranged. However, The number can be made according to the selection.

Specifically, when the object to be dried is charged through the input portion 121a of the first cyclone drying apparatus 100a, the drying proceeds primarily through the above-described process, and the discharge portion 122a to the first cyclone drying apparatus 100a, Is discharged into the discharge portion 122c of the second cyclone drying apparatus 100b and is secondarily dried and discharged to the discharge portion 122c. The laundry is thirdarily discharged from the third cyclone drying apparatus 100c and may be discharged as a dried matter from the discharge portion 122c.

In order to transfer heat required for drying in each cyclone drying apparatus, a heat medium circulation unit is provided inside each casing, and preferably, the respective heat medium circulation units can communicate with each other. That is, the heat medium circulation unit disposed in the first cyclone drying apparatus 100a, the second cyclone drying apparatus 100b, and the third cyclone drying apparatus 100c may be a flow path of one second heat medium.

Here, the moving direction for the heat transfer of the second heat medium may be in the moving direction of the laundry, that is, the order of the first cyclone drying apparatus 100a, the second cyclone drying apparatus 100b, and the third cyclone drying apparatus 100c However, in order to maximize drying efficiency, it is preferable that the moving direction of the second heating medium is in the order of the third cyclone drying apparatus 100c, the second cyclone drying apparatus 100b, and the first cyclone drying apparatus 100a.

Therefore, in the first cyclone drying apparatus 100a in which the heat of the second heating medium is relatively high and the drying is relatively slow in the third cyclone drying apparatus 100c in which the drying is most advanced, The heat of the heat medium is released. In this way, the moisture content of the dried material passing through each cyclone drying apparatus can be further minimized according to the concept that the arrangement direction of the plurality of cyclone drying apparatuses is opposed to the direction of movement of the laundry and the second heating medium in the drying process.

Since the second heating medium is moved along one circulation path, the second heating medium finally discharged by the first cyclone drying apparatus 100a is reduced to the heating device 200, absorbs the heat again, To the third cyclone drying apparatus 100c. Here, the movement path a represents the circulation path of the second heating medium.

In addition, as described above, the drying system of the present invention may further include a solids separation apparatus 400 for recovering the first heating medium 141 from the dried material discharged from the final cyclone drying apparatus, Since the moisture content is minimized, the first heating medium 141 is recycled and the recovered first heating medium 141 can be reduced to the first cyclone drying apparatus and reused. Here, the movement path b represents the movement of the first heating medium 141 to be recovered. The first cyclone drying apparatus 100a may further include a first heating medium inlet 124 for introducing the recovered first heating medium 141 into the first cyclone drying apparatus.

In addition, the plurality of cyclone drying apparatuses 100 may be arranged in series to sequentially dry the laundry, but the heat medium circulation units may be arranged in parallel so as to form the flow paths of the second heating medium independently of each other in series.

On the other hand, the water evaporated in each cyclone drying apparatus and discharged to the water outflow portions 123a, 123b, and 123c is condensed through the condenser 300 to be changed into a liquid state, May be processed through the device 320.

In addition, the deodorizing process can be performed through the deodorizer 310 because the non-liquefied gas component may cause odor or environmental pollution if it is directly discharged.

The indirect drying cyclone drying apparatus and drying system according to the concept of the present invention described above can dry the laundry more effectively by the first heating medium 141, so that the water content of the dried material can be minimized by using less energy . In particular, the dried material can be used as a high-quality recycled fuel as compared with the conventional simple drying method.

In addition, since the drier is effectively dispersed due to the specific gravity difference while using the indirect drying type cyclone type drier, the effect of dispersion and separation is further increased by the coil-shaped heat medium circulation unit 130, The equipment such as the induction pipe which is provided for the improvement can be omitted and the economical efficiency can be further improved.

Also, since the first heating medium 141 and / or the laundry are repeatedly moved through the space between the coil pitches of the heating medium circulation unit 130, the efficiency reduction due to the formation of the scale in the heat exchanging unit is prevented, The vortex generation is more effectively performed, and thus the separation of the dried material can be more reliably performed.

In the foregoing, the present invention has been described in detail based on the embodiments and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the content of the following claims.

100, 100a, 100b, 100c ... cyclone drying apparatus 110 ... casing
120 ... Stirrers 121, 121a, 121b, 121c ... Input unit
122, 122a, 122b, 122c, ..., discharge portions 123, 123a, 123b, 123c, ...,
124 ... first heating medium inlet part 130 ... heating medium circulation part
131 ... second heat medium inlet portion 132 ... second heat medium outlet portion
141 ... first heating medium 200 ... heating device
300 ... condenser 310 ... deodorizer
320 ... water treatment device 400 ... solids separation device

Claims (14)

A casing formed with a space for forming a space therein and into which a material to be dried is introduced, and a discharge portion formed below the center and through which the dried material is discharged;
A first heating medium filled in the space inside the casing and mixed with the laundry;
A stirrer disposed inside the casing and stirring the first heat medium to generate rotational flow;
A heat medium circulation unit disposed inside the casing and performing heat transfer to the first heat medium; And
And a second heat medium flowing inside the heat medium circulation part,
The heat medium circulation unit conveys the heat of the second heat medium to the drying object to evaporate moisture,
The drying object having increased specific gravity as the drying progresses is moved to the inner wall side of the casing by the centrifugal force and is moved to the lower side of the space inside the casing while being spirally rotated by gravity and centrifugal force, And is discharged through a discharge portion. The method according to claim 1,
Wherein the heat medium circulation unit is formed in a coil shape and is arranged to surround the stirrer,
Wherein the first heat medium flows repeatedly to the inside and outside of the heat medium circulation part through the space between the coil pitches of the heat medium circulation part to increase the heat contact with the heat medium circulation part. 3. The method of claim 2,
Wherein the first heat medium continuously cleans the outer surface of the heat medium circulation part during the flow to prevent scale formation. 3. The method of claim 2,
Wherein the first heat medium is passed through a space between the coil pitches of the heat medium circulation part and the flow rate is increased. The method according to claim 1,
Wherein the first heating medium is made of at least one material selected from waste cooking oil, ionic refining oil, BC oil, and mineral oil. The method according to claim 1,
Wherein the second heating medium is made of any one material selected from the group consisting of steam, exhaust gas of a combustor, and oil. The method according to claim 1,
And a heating device for heating the second heating medium. The method according to claim 1,
And a condenser for condensing the water evaporated from the object to be dried and separating the liquid into a liquid phase. The method according to claim 1,
And a solids separation device for separating the first heat medium mixed into the dried matter discharged from the discharge part. The method according to claim 1,
Wherein the heat medium circulation part is formed adjacent to an inner wall side of the casing. A drying system comprising a cyclone drying apparatus of indirect drying type according to any one of claims 1 to 10,
Characterized in that a plurality of cyclone drying apparatuses are arranged in series so as to successively dry the objects to be dried, 12. The method of claim 11,
Wherein the heat medium circulation units provided in each of the cyclone drying apparatuses communicate with each other. 12. The method of claim 11,
The second heating medium is circulated so as to be heated by a heating device and to be heat-transferred in a plurality of cyclone drying apparatuses,
Wherein the second heat medium flowing at a high temperature is heat-transferred to the drier to which drying is relatively advanced, and the second heat medium flowing at a low temperature is heat-transferred to the drier which is relatively less dry. 12. The method of claim 11,
Wherein the arrangement direction of the plurality of cyclone drying apparatuses faces the moving direction of the laundry and the second heating medium in the drying process.

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