JP2004150641A - Agitation type drying device and drying system for powder/grain material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an agitation type drying device capable of drawing the maximum processability of a device to efficiently perform an optimum drying process and transportation without lowering heat efficiency, deteriorating fluidity, or making a transportation (or drying) capacity short due to dispersed charge even in the case of processing a material of such characteristics as not to require the whole range of a transportation span, or a material of such high viscosity as to get easily attached to blades 201. <P>SOLUTION: Between a first charging port 301 and a discharge port 105, a second charging port 301a is provided, and a raw material is mixed with a powder/grain material transported with its drying process almost completed in a casing 1 to be drying-processed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an agitated-type drying apparatus for a granular material that sequentially transfers various types of granular materials (organic and inorganic substances) including slurry and moisture in a predetermined container and performs a drying process.
[0002]
[Prior art]
In general, this type of stirring type drying apparatus performs a drying process by sequentially transporting a relatively long container from a material input port to a discharge port while heating and stirring the processed material.
Conventionally, as disclosed in Japanese Patent Publication No. 48-44432, a shaft is suspended in a horizontally long casing, and a number of hollow rotors as heat exchangers are arranged on the shaft at regular intervals. There is known a structure in which the transfer of the processed material from the raw material input port to the discharge port is controlled by the partition effect (good piston flowability).
[0003]
However, an imbalance may occur between the transfer capacity and the drying capacity (heat exchange capacity) depending on the physical properties of the raw material to be processed. That is, based on the heat exchange capacity calculated from the heat transfer area by the drying device, the required amount of processing capacity (drying capacity) may be present but the amount corresponding to the capacity may not be transferred.
Specifically, in the case of a processed material with poor fluidity, if the raw material corresponding to the drying capacity is charged, it will accumulate near the inlet, and the amount will gradually increase, making it impossible to supply continuously, as well as after the accumulation point The heat transfer area is not effectively used because the amount of the processed material transferred inside the container is small, and the target water content is reached halfway to the discharge port (the surplus area does not contribute to the drying process). . Therefore, if the input amount is reduced, the processed product can be transferred, but the target water content is reached during the transfer, and the drying ability of the apparatus cannot be fully utilized, as in the above case. Further, in the case of an organic solvent having a volatile latent heat smaller than that of water, the tendency is remarkable.
For this reason, it is attempted to improve the transfer capacity by increasing the rotation speed of the shaft or inclining the drying device (lowering the discharge port side). However, there is a limit, and various adjustments are made according to the physical properties of the processed material. It is difficult to manage the operation efficiently using the processing capacity of the apparatus, and this is an obstacle to the drying capacity.
Further, in the case of a processed material such as a high-viscosity raw material which easily adheres to the blade body during the drying process, the so-called feedback method in which a part of the dried processed material is mixed with the raw material and thrown in so as to avoid the adhesion in advance. However, if a feedback device is introduced, the entire device becomes large-scale, and the amount of processed material that passes therethrough increases, so that the drying device itself becomes large, which not only causes a high cost, but also increases the product cost. As a result, it is necessary to perform a task of sorting the items to be collected and the items to be fed back, which is a factor that complicates the operation.
[Patent Document 1]
JP-B-48-44432 [0004]
[Problems to be solved by the invention]
The present invention has been conceived in order to eliminate the above-mentioned problems, and even when powdery and particulate materials having various different physical properties are dried in a predetermined transfer area, the raw material can be removed at one place. It is possible to perform divided charging without accumulating on the surface, and by transferring the raw material mixed with the material that has been almost completely dried, the dry powder absorbs the moisture of the wet powder (reduces the apparent water content). It becomes possible to use the material in the middle of the area, and the raw material charged halfway can be processed in a shorter time than the processing time from the first charging port, and even if the charging amount from the first charging port is reduced. By the introduction from the second inlet, not only can the processing be performed without lowering the efficiency of the drying ability of the entire apparatus, but also the dispersion of the highly viscous raw material which is easily attached to the blades can be dispersed. Reduces thermal efficiency Without causing deterioration of fluidity or shortage of transfer capacity, adhesion and accumulation near the respective inlets are avoided, appropriate drying treatment and transfer are performed, and accordingly, the apparatus according to the physical properties of the processed material, etc. It is an object of the present invention to provide an agitation-type drying apparatus for powdery and granular materials that can draw out the processing capacity to the maximum and can efficiently utilize the processing ability and can also avoid the necessity of using a feedback device.
[0005]
[Means for Solving the Problems]
The technical means adopted by the present invention to solve the above-mentioned problems includes a first raw material inlet provided at one end of the casing, a product outlet provided at the other end, and the first raw material inlet provided inside the casing. What is claimed is: 1. A stirring-type drying device comprising a shaft having a blade body suspended between an inlet and an outlet, wherein the casing has a second inlet between the first inlet and the outlet. Is provided.
Further, a raw material input port and a discharge port are provided on one end side and the other end side of the casing, respectively. The raw material input from the input port is dried by a heating means, and provided on a shaft mounted inside the casing. A stirring-type drying system in which the material is transferred while being stirred by a blade and discharged from the discharge port. It is characterized by the following.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail based on a stirring-type drying apparatus for a granular material, which is exemplified as a preferred embodiment.
1 and 2, FIG. 1 is a partially cutaway overall view of a conductive heat transfer type grooved stirring and drying apparatus provided with a jacket provided with a stirring mechanism and a heating mechanism, and FIG. 2 is a plan view of a main part thereof. Numeral 1 denotes a casing of a drying device composed of a container that is relatively long, and the casing 1 has a cover 3 to be described later, is formed substantially in a U-shape in cross section, and has a W-shaped bottom. There is provided a jacket 102 which forms a shape and further forms a medium circulation path 101 for heat exchange by covering the bottom surface area and the side surface area thereof. Can be mounted with a slight downward inclination.
A heating medium inlet 103 and a heating medium outlet 104 are provided at both left and right ends of the jacket 102, respectively. The heating medium (steam, hot water, or the like) having a predetermined temperature is circulated in the medium circulation path 101 to circulate the casing 1. Heat to a constant temperature. The product outlet 105 is provided adjacent to the heat medium outlet 104 which is the right end of the casing 1. The inlet and outlet are reversed depending on the type of the heat medium to be used.
[0007]
Inside the casing 1, hollow shafts 2 and 2 having hollow fan-shaped blades 201 are rotatably mounted in a state of being penetrated on both sides thereof in parallel in the front-rear direction. 2 has a configuration in which the hollow portions communicate with each other. The blade body 201 is formed in a wedge shape so that the rotation direction side becomes the front end side and becomes narrow, and a wide rear end portion is provided with a frying plate 201a. Then, the frying blades 201a perform a function of frying the processed material in the rotation direction.
On the outer side of the casing, the shafts 2 and 2 link a sprocket 203 provided on one of the shafts 2 and a sprocket 204 of a drive motor in an interlocking manner by a chain 205 so that the gears 202 and 202 provided on the respective shafts mesh with each other. , Are configured to rotate in opposite directions. Rotary joints 206 and 207 for introducing and circulating a heating medium (steam, hot water, etc.) are provided at both ends of the shaft 2 so that the blade body 201 and the shaft 2 function as a heating body. Has become.
[0008]
Reference numeral 3 denotes a cover body which forms a casing main body together with the casing 1 and covers the upper surface of the casing 1. The cover body 3 has a material inlet 301 at the center on the left upper surface and carrier gas (air, non-air) at both left and right ends. Active gas and the like) are provided with inlets 302, 302, and an outlet 303 is provided at the center thereof.
These configurations are generally known technologies disclosed in Japanese Patent Publication No. 48-44432, and based on such configurations, the powdery and granular material supplied quantitatively from the raw material input port 301 rotates the blades 201. As a result, the propulsion force in the direction parallel to the casing 1 is received, and the inside of the casing 1 is gradually moved toward the product discharge port 105 while maintaining a certain degree of filling. In this process, the granular material is agitated with the rotation of the blade body 201, so that the material is heated by conduction heat transfer from the shaft 2, the blade body 201, and the medium circulation path 101, receives a drying action, and It is configured to be discharged from the discharge port 105. Note that water and other volatile components evaporated from the material during the drying process are discharged from the gas outlet 303 along with the carrier gas from the inlet 302.
[0009]
Now, reference numerals 301a, 301b, and 301c denote second raw material inlets provided on the upper surface of the cover body 3, and the second raw material inlets 301a, 301b, and 301c respectively correspond to the raw material inlets 301. The first inlet is fixedly disposed at an arbitrary position in the transfer area between the first inlet 301 and the product outlet 105 at a predetermined interval, and all the inlets are formed to have substantially the same size. Have been.
[0010]
The second input ports 301a, 301b, and 301c are used for transferring the raw material supplied from the first input port 301 through the casing 1 while being dried by the heating means. Is used to mix a new raw material with the target as a target, and a material at an optimum arbitrary position depending on the physical properties of the raw material to be treated is appropriately and selectively used. Specifically, one or two or all of the second inlets 301a, 301b, 301c at an arbitrary position that is optimal in consideration of the dry state are selectively used.
[0011]
FIG. 4 is a graph showing changes over time in water content and material temperature. In this graph, I is a material preheating period, II is a constant rate drying period, and III is a decreasing rate drying period. In the initial stage of drying the granular material, the drying speed is constant and the drying period is constant, and the free surface water of the material evaporates, and the temperature of the material is constant. During the lapse rate drying period, after the surface free water is completely evaporated during the drying process, the temperature of the material gradually increases while moisture diffused from the inside of the material continues to be dried. That is, in the constant-rate drying period, all the input heat is used for evaporating the moisture, but for the decreasing-rate drying period, it is used for evaporating the moisture and increasing the material temperature. When this graph is applied to the stirring type drying apparatus shown in FIG. 1, the raw material input from the first input port 301 is transferred to the product discharge port 105 side in the casing 1 while the shaft 2, the blade body 201 and It is heated by the conduction heat transfer from the medium circulation path 101, first dried at a constant speed, and the surface free water evaporates (the material temperature is almost constant, period II). Subsequently, the moisture diffused from the inside of the material continues to be dried and is discharged from the product discharge port 105 (the temperature of the material gradually increases. Period III). Therefore, the raw material supplied from the second input port is liable to be mixed into the target area (where the moisture content of the material transferred from the first input port 301 is lower than the critical moisture content and the material temperature is increased). desirable. Here, the raw material (wet powder) input from the second input port is stirred and mixed with the material (dry powder) in a dry state by the rotation of the blade 201. Then, the dry powder has a property of absorbing the moisture of the wet powder (reducing the apparent moisture content), and since the dry powder surrounds the wet powder, it does not adhere to the wing body 201 and the like, and the material is transferred in this portion. There is no accumulation that inhibits Further, since the wet powder is dried instantly by receiving heat from the dry powder and the shaft 2, the blade body 201, and the medium circulation path 101, the drying process can be performed in a shorter time as compared with the one input from the first input port 301. Can be done with
In this embodiment, the second input ports 301a, 301b, and 301c are of a so-called fixed type in which the input ports are arranged at equal intervals. In this case, supply management for appropriately adjusting the input amount is performed. On the other hand, when processing is performed by supply management with a constant input amount, the distance between the first input port 301 and the second input port 301a and the distance between the second input ports 301a, 301b, and 301c may be appropriately adjusted. Often, the arrangement is arbitrary. In the above-mentioned drying apparatus, a plurality of resistance temperature detectors (thermometers) are inserted into the apparatus from the side surface almost at the same height as the shaft 2 through the jacket 102 and the casing 1 at equal intervals. By measuring the temperature of the material, the position and amount of the second inlet can be adjusted.
[0012]
FIGS. 5 and 6 show an embodiment in which the second inlet is a movable type. In the figure, reference numerals 311a, 311b, 311c denote second inlets, each of which has a plate portion 312 at the bottom and is independently formed in a substantially ⊥ shape when viewed from the side. Have been. On the other hand, on the upper surface of the cover body 3, elongated holes 313 for charging raw material are opened in the longitudinal direction (between the first inlet 301 and the outlet 105). Guides 314, 314 are provided to sandwich the edge of the portion 312, guide movement (slide) in the front-rear direction, and fix it. The guide body 314 has an inverted L-shape when viewed from the side. Bolt holes 314a are formed at a predetermined pitch on the upper surface, and each second inlet is guided to the guide body 314 and moved to a predetermined position. Thereafter, by tightening the edge portion of the plate portion 312 using a bolt 314b, the plate portion 312 is brought into pressure contact with the upper surface of the cover body 3 to be positioned and fixed.
[0013]
In the embodiment shown in FIG. 5, the plate portions 312 of all the second input ports 311a, 311b, and 311c are arranged side by side (FIG. 5B). 312 is lifted and placed on the plate portion 312 of the second input ports 311a and 311c so as to partially overlap (FIG. 5 (C)) so that the second input ports 311a and 311c are movable. Is adjusted. In addition, the space | interval with the 1st input port 301 has the aspect which carried out slide adjustment of the 2nd input port 311a, and expanded a little.
[0014]
In the embodiment shown in FIG. 6, the plate portion 312 having the second inlet and the plate portion 312a not having the second inlet are each modularized and appropriately selected and combined, so that each of the second inlets 311a, 311b and 311c are configured to be movable, and the distance between them is adjusted. That is, the two plate portions 312a and 312a are arranged between the plate portions 312 of the second input ports 311a, 311b and 311c, respectively (FIG. 6A), and the number is reduced to one. One plate portion 312a is moved to move the plate portion 312 of 311b and 311c toward the second input port 311a, and close the slot 313 exposed on the product discharge port 105 side of the plate portion 312 of the second input port 311c. The position is adjusted in the added mode (FIG. 6B). The distance between the first input port 301 and the second input port 311a can be adjusted by sliding the entire second input port.
In addition, the width of each of the plate portions 312 and 312a can be set to an appropriate size, and the number of the plate portions 312 and 312a can be finely adjusted by increasing the number arranged between the second input ports and making the second adjustment. It is also possible to arbitrarily combine and arrange the number of sheets arranged between the charging ports or different widths.
[0015]
In the movable type embodiment, the gas outlet 303 may be provided in another portion, and it is needless to say that the plate portion having the outlet 303 can be modularized. Further, the long hole 313 is provided continuously between the second input ports 311a and 311c, but may be provided for each second input port, and the opening is extended to include the first input port 301. May be continuous.
[0016]
In the embodiment of the present invention configured as described above, a first material input port 301 provided at one end of the casing 1 (cover body 3) and a product outlet provided at the other end are now provided. The wet-powder material is dried in a stirring-type drying apparatus including a shaft 105 having a blade body 201 suspended between the first inlet port 301 and the outlet port 105 inside the casing 1. However, the casing 1 (cover body 3) of the present apparatus is provided with a plurality of second inlets 311a, 311b, or 311c in a prescribed transfer area between the first inlet 301 and the outlet 105. Therefore, even in the case of processing powdery and granular materials having various different physical properties in a predetermined transfer area, it is possible to input the raw material from an optional second input port in addition to the first input port 301, and Collected in one place There is no split-up can be carried out.
For this reason, for example, even when the raw material to be processed is completed in the drying process during the transfer of the specified region, the outlet side region after drying may become an excess region that does not contribute to the drying process. In addition, not only can the entire area be effectively utilized, but also the raw material (wet powder) supplied from the second input port is mixed with the dried material (dry powder) transferred from the first input port 301. And the property that the dry powder absorbs the moisture of the wet powder (reduces the apparent water content) can be used in the middle of the transfer area. In comparison, a drying system that can process in a shorter time can be realized.
[0017]
Therefore, even if the amount of input from the first input port 301 is reduced, by performing input from the second input port, a drying process can be performed without lowering the efficiency of the drying capacity of the entire apparatus. Even processed materials such as highly viscous raw materials that are easy to adhere can be dispersed and charged without being collected in one place, and each of them can be charged without causing a decrease in thermal efficiency, deterioration in fluidity, or shortage of transfer capacity. Adhesion near the mouth is avoided, proper drying processing and transfer are performed, so that the processing capacity of the apparatus can be maximized and efficiently used according to the physical properties of the processed material, and a feedback apparatus needs to be used. Sex can also be avoided. It is optional to use the second inlet as the first inlet.
[0018]
5 and 6, the second input ports 311a, 311b, and 311c are independent or integrated with each other, and the first input port 301 and the discharge port are formed on the cover body 3 constituting a casing. Since each of the second inlets can be moved to and fixed to the raw material input target area shown in FIG. Allocation can be adjusted, and even when switching between processed materials with different physical properties, operation management and control can be performed in a well-balanced manner between the drying capacity and the transfer capacity that match the physical properties, etc. I can do it.
[0019]
Further, since the second inlets 311a, 311b, 311c are configured to communicate with the inside of the casing through an elongated hole 313 opened in the axial direction of the cover body 3 in the movable range thereof, The moving configuration of the two inlets may be an overlap type (FIG. 5) or a module type (FIG. 6) as it is without changing the shape of the particularly elongated hole 313.
Moreover, by extending the elongated hole 313 to include the first input port 301, the first input port 301 can also be configured to be easily movable.
[0020]
【The invention's effect】
The present invention relates to a first raw material inlet 301 provided at one end of the casing 1 (3), a product outlet 105 provided at the other end, and the first inlet 301 and the outlet provided inside the casing. A stirring-type drying device comprising a shaft 2 having a blade body 201 suspended between 105, wherein a second charging is performed between the first charging port 301 and the discharging port 105 in the casing 3. By providing the mouth 301a,
Further, by mixing the raw material into the powder and granules in the middle of the transfer in which the drying process in the casing is substantially completed, and performing the drying process,
Even in the case of processing powdery and granular materials of various different physical properties in a predetermined transfer area, it is possible to perform divided charging without accumulating raw materials in one place, and it is assumed that drying processing is substantially completed. By introducing the raw materials to be mixed, the property that the dry powder absorbs the moisture of the wet powder (reduces the apparent water content) can be used in the middle of the transfer area. The processing time can be reduced in a shorter time than the processing time described above, and the efficiency of the drying capacity in the entire apparatus is reduced by the charging from the second charging port 301a even if the charging amount from the first charging port 301 is reduced. Not only can processing be carried out without any problem, but even if a processed material such as a high-viscosity raw material that easily adheres to the blade body 201, dispersion and introduction causes a decrease in thermal efficiency, a deterioration in fluidity, and a shortage of transfer capacity. Immediately, adhesion and accumulation near each input port are avoided, appropriate drying processing and transfer are performed, and accordingly, the processing capacity of the apparatus is maximized and efficiently used according to the physical properties of the processed material. And the necessity of using a feedback device can be avoided.
[Brief description of the drawings]
FIG. 1 is a partially broken whole configuration diagram of an agitation type drying device for a granular material. FIG. 2 is a longitudinal sectional view of FIG. 1. FIG. 3 is a plan view of FIG. 1. FIG. FIG. 5 is a structural view showing a second embodiment of a second inlet, (A) is a plan view, (B) is a longitudinal sectional view, and (C) is a sectional view showing a moving state thereof. FIG. 6 is a structural view showing a third embodiment of the second inlet, wherein (A) is a plan view, and (B) is a plan view showing a moving state thereof.
DESCRIPTION OF SYMBOLS 1 Casing 101 Medium circulation path 102 Jacket 103 Heat medium inlet 104 Heat medium outlet 105 Product discharge port 2 Shaft 201 Blade body 201a Raising plate 202 Gear 203 Sprocket 204 Sprocket 205 Chain 206 Rotary joint 207 Rotary joint 3 Cover body 301 Raw material inlet ( 1st slot)
301a second inlet 301b second inlet 301c second inlet 302 inlet 303 gas outlet 311a second inlet 311b second inlet 311c second inlet 312 plate portion 312a plate portion 313 slot 314 guide body 314a Bolt hole 314b Bolt

Claims (6)

A first raw material inlet provided at one end of the casing, a product outlet provided at the other end, and a wing body suspended between the first inlet and the outlet inside the casing. A stirring type drying device comprising a shaft having a second input port provided between the first input port and the discharge port in the casing. Drying equipment. 2. The agitation type drying apparatus for a granular material according to claim 1, wherein one or more second inlets are provided at predetermined intervals in an axial direction. 3. The agitation type drying apparatus for a granular material according to claim 1, wherein the second inlet is provided so as to be movable between the inlet and the outlet. The powder according to claim 3, wherein the second charging port communicates with the inside of the casing in a movable range thereof through an elongated hole formed in the cover body constituting the casing in an axial direction. Agitation type drying device for granules. 5. The agitation type drying apparatus for granular materials according to claim 1, wherein the drying apparatus is a conduction heat transfer type channel type agitation type drying apparatus. A raw material input port and a discharge port are provided at one end and the other end side of the casing, respectively. The raw material input from the input port is dried by heating means, and a blade body provided on a shaft mounted inside the casing. A stirring-type drying system that transfers the powder while stirring, and discharges the powder from the discharge port. And the drying system of the granular material.

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