JP4003175B2 - Method and apparatus for drying high water content organic residue - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drying apparatus such as a dry food material provided with a fluidized bed dryer, and is particularly suitable for drying a residue material having a high water content such as okara, beer lees, coffee lees, and sake lees. The present invention relates to a method for drying a water-containing organic residue and an apparatus therefor.
[0002]
[Prior art]
Conventionally, okara produced as a residue substance during the production of tofu has been used as a food, as a feed, a fertilizer, and the like. And in order to improve the preservation of Okara and further expand its uses, Okara is dried to obtain dried products, and beer lees and coffee lees are also dried and used effectively. An example of a device for this purpose is shown in FIG. 6 (see, for example, Patent Document 1).
[0003]
The apparatus connects a screw conveyor 52 'for supplying okara as raw material M to the fluidizing chamber 12' of the fluidized bed dryer D ', and raises the raw material M while fluidizing it at the bottom of the fluidizing chamber 12'. A circulating air supply device 3 'is connected, and a cyclone 6' is connected to the next stage of the exhaust port 13a 'provided at the upper part of the fluid chamber 12'. The dried product separated by the cyclone 6 'is connected to the cyclone 6'. A cooler for cooling P is connected. Further, a part of the dried product P separated by the cyclone 6 'is returned to the upstream side of the screw conveyor 52', and hot air from the fluidized air supply device 3 'is supplied to the screw conveyor 52'. It is composed.
[0004]
During the operation of such a device, the raw material M supplied from the screw conveyor 52 'into the fluid chamber 12' is dried by the warm air sent from the fluid air supply device 3 '. The dried product P having a reduced moisture content by the action of warm air rises in the fluid chamber 12 'and is sent to the cyclone 6' where it is separated from the air stream and then discharged. Then, a part of the dried product P separated by the cyclone 6 'is supplied to the screw conveyor 52', in which the undried raw material M and the dried product P are mixed and preheated, By supplying this into the flow chamber 12 ', drying in the flow chamber 12' is attempted to be performed satisfactorily. That is, if the raw material M having a high water content is supplied to the fluidizing chamber 12 'as it is, the raw material M will adhere to the inside of the fluidizing chamber 12', or lumps will be generated and drying will not be performed satisfactorily. The apparatus is designed to avoid such a situation.
However, in reality, there are problems that germs propagate in the screw conveyor 52 ′ and the quality of the dried product P varies due to the variation in the mixing degree of the raw material M and the dried product P. .
[0005]
[Patent Document 1]
JP 2000-249465 A (pages 2 to 4, FIG. 1)
[0006]
[Technical problem to be solved]
The present invention has been made in view of such a background, and in particular, a residue material having a high water content such as okara can be dried without adhering in the drying apparatus, and more homogeneous. Development of a novel method for drying a highly water-containing organic residue capable of obtaining a dried product and its apparatus was a technical issue.
[0007]
[Means for Solving the Problems]
That is, in the drying method of the high water content organic residue according to claim 1, the fluid wind blowing chamber, the fluid chamber and the exhaust chamber are connected in the vertical direction, and the eye plate is partitioned between the fluid wind blowing chamber and the fluid chamber. In the method of drying raw materials supplied into the fluidized chamber with hot air supplied into the fluidized chamber through the fluidized air blowing chamber, after the drying process is performed in the fluidized chamber, the material is discharged to the outside through the exhaust chamber. A part of the discharged dry product is re-introduced into the fluid chamber, and the newly supplied raw material and the re-introduced dry product in the fluid chamber are used as the raw material input port and the dry product return port. faces with comprises a vane located by mixing the dispersion blades provided in the flow chamber by, characterized in that the drying in a state with a reduced water content of raw materials located flow chamber One in which you composed.
According to the present invention, since the raw material and the dried product are mixed in the fluid chamber, the moisture content of the raw material located in the fluid chamber is reduced without requiring a special mixing device, and the adhesion and damage of the raw material to the fluid chamber are reduced. Can be effectively prevented. In addition, since the raw material and the dried product are mixed in the fluid chamber, the degree of mixing of both is uniform, and the product quality does not vary. Furthermore, various germs do not propagate in the mixing process of the raw material and the dried product.
[0008]
In addition to the above requirements , the method for drying a highly water-containing organic residue according to claim 2 is characterized in that the raw material is passed through a static mixer and then charged into a fluid chamber.
According to this invention, since raw materials can be dispersed and charged, the degree of mixing of the raw materials and the dried product becomes even more uniform, and further, the dispersibility of these mixtures improves, so that the adhesion of the raw materials into the fluid chamber and It is possible to effectively prevent the occurrence of lumps and there is no variation in product quality.
[0009]
According to a third aspect of the present invention, there is provided a drying apparatus for a highly water-containing organic residue, wherein the fluid wind blowing chamber, the fluid chamber and the exhaust chamber are connected in the vertical direction, and a plate plate is provided between the fluid wind blowing chamber and the fluid chamber. In the apparatus for drying raw materials supplied into the fluid chamber by hot air supplied into the fluid chamber through the fluid air blowing chamber, the dried product discharged from the exhaust chamber is again put into the fluid chamber. In addition, the flow chamber is provided with a dispersion vane having vanes positioned facing the raw material inlet and the dried product return port .
According to the present invention, since the raw material and the dried product can be mixed in the fluid chamber, the moisture content of the raw material located in the fluid chamber is reduced without requiring a dedicated mixing device, and the raw material in the fluid chamber is reduced. It is possible to effectively prevent adhesion and occurrence of lumps. In addition, since the raw material and the dried product are mixed in the fluid chamber, the degree of mixing of both is uniform, and the product quality does not vary. Furthermore, various germs do not propagate in the mixing process of the raw material and the dried product.
[0010]
Furthermore, in addition to the requirements described in the third aspect , the high water content organic residue drying apparatus according to the fourth aspect is characterized in that a static mixer is provided at the raw material inlet in the flow chamber.
According to the present invention, when the raw material is charged into the flow chamber, it can be performed with improved dispersibility. As a result, the degree of mixing of the raw material and the dried product becomes even more uniform, It is possible to effectively prevent the adhesion of raw materials to the room and the occurrence of lumps, and there is no variation in product quality.
The above problems can be solved by using the configuration of the invention described in each of the claims as a means.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the “drying method and apparatus for a highly water-containing organic residue” of the present invention will be specifically described. First, a drying apparatus D for a highly water-containing organic residue will be described, and then a high water content together with the operation mode of this apparatus. The method for drying the organic residue will be described.
What is indicated by a symbol D in the figure is a high water content organic residue drying device, which is a fluidized bed dryer 1, a raw material supply device 2, a fluidized air supply device 3, a bag filter 4, a distributor 5, a cyclone 6 and an emergency. It comprises a discharge device 7.
[0012]
First, the fluidized bed dryer 1 will be described in detail. As shown in FIG. 2, this apparatus has a hollow tower-like overall shape, and a fluidized air blowing chamber 11 is formed at the lowermost part, and an upper part thereof. A fluid chamber 12 is provided, and an exhaust chamber 13 is connected above the fluid chamber 12. Further, a countersink plate 14 is provided as a partition between the fluid wind blowing chamber 11 and the fluid chamber 12.
[0013]
The fluid air blowing chamber 11 is a cylindrical member having an open upper surface, and has an air inlet 11a formed in a side peripheral portion thereof, and a fluid air supplying device 3 described later is connected to the air inlet 11a. . A falling object discharge port 11b is formed in the lower part of the flowing air blowing chamber 11, and the valve 11c is opened so that the falling object from the eye plate 14 can be discharged.
[0014]
Further, the fluid chamber 12 is a member in which an inverted frustoconical portion having an open upper and lower surface and a cylindrical portion are combined, and although not shown, a door and a monitoring window are appropriately provided on the side peripheral surface to clean the inside. It is configured to enable maintenance and visual inspection. Further, the side peripheral portion is further formed with an inlet 12a, a return port 12b, and an emergency outlet 12c from above at different height positions, and raw material supply devices to be described later with respect to these openings. 2, a distributor 5 and an emergency discharge device 7 are connected. As shown in FIG. 5, the insertion port 12a is formed at two positions at the same height that are shifted by 90 ° in a plan view.
[0015]
The exhaust chamber 13 is a cylindrical member having an open bottom surface. An exhaust port 13a is formed on the upper surface, and a bag filter 4 described later is connected to the exhaust port 13a.
As an example, the plate 14 provided above the fluidized air blowing chamber 11 employs a plate formed by punching a number of holes in a so-called punching metal shape on a circular metal plate.
[0016]
Furthermore, an upper stage dispersion blade 151, a middle stage dispersion blade 152, and a lower stage dispersion blade 153 are located in the flow chamber 12. Here, the stirring device 15 including these dispersion blades will be described. As shown in FIGS. 2 and 3, the stirring device 15 has an upper dispersion blade 151, an intermediate dispersion blade 152, and a lower dispersion blade from the top with respect to the rotating shaft 150 that penetrates the fluidized air blowing chamber 11 and reaches the fluid chamber 12. It has 153 three types of dispersed wings.
Further, the upper stage dispersion blade 151 and the middle stage dispersion blade 152 are each provided with a blade plate 155 for the tip portion of the rod 156 fixed to the rotary shaft 150. Each blade plate 155 is shown in FIG. As shown in the figure, each of them is positioned so as to face the vicinity of the input port 12a and the return port 12b with rotation. The vane plate 155 is formed with a semicircular cutout 155a as shown in FIG. 3C as an example.
The lower dispersion blade 153 is configured by fixing a rod 156 to the rotating shaft 150.
The rotating shaft 150 is connected to an output shaft of a motor 157 provided below the fluidized-air blowing chamber 11, and rotationally drives the upper dispersion blade 151, the middle dispersion blade 152, and the lower dispersion blade 153.
[0017]
The stirring device 15 is configured with three types of dispersing blades in this embodiment, but the number can be increased or decreased as necessary. In the embodiment shown in FIG. And an auxiliary dispersion blade 158 composed only of a rod 156 between the intermediate dispersion blade 152 and the intermediate dispersion blade 152.
Also, the structure of the individual dispersion blades can be changed as appropriate. In the embodiment shown in FIG. 4, the blade plate 155 is attached with an angle to the rod 156. Further, the middle dispersion blade 152 and the lower dispersion blade 153 are configured by attaching a rod 156 only to one side of the rotating shaft 150. Further, the lower dispersion vane 153 is configured to include an upper plate 159 that is positioned substantially in the entire radial direction of the countersink plate 14.
[0018]
The fluidized bed dryer 1 is configured as described above as an example, and the other elements constituting the highly water-containing organic residue drying apparatus D will be described below. First, the raw material supply device 2 combines a hopper 21 and a screw conveyor 22 and connects a branch pipe 23 to a pipe connected to the discharge port of the screw conveyor 22 as shown in FIG. A flexible tube 24 is connected to each branch path, and the flexible tube 24 is connected to a static mixer 25 connected to the inlet 12 a in the flow chamber 12.
[0019]
The fluid air supply device 3 is a device for supplying the fluid air blowing chamber 11 to the fluid air blowing chamber 11 after raising the temperature of the outside air supplied from the blower 32 by the heater 31. As an example of the inside of the fluid air blowing chamber 11, The opening degree of the fuel supply valve 33 can be adjusted in accordance with the detection value of the temperature sensor provided in the upper part.
[0020]
The bag filter 4 is provided with a filter element 41 in a housing 40, thereby separating the dried product P and gas. The dried product P is a scrub provided at the lower part of the housing 40. It is discharged from the U conveyor 42. On the other hand, an appropriate path is formed for the gas component so that the gas component can be sent to the fluid wind supply device 3 in order to effectively use heat. If the exhaust gas is circulated and used in this way, the temperature of the hot air increases, and the sterilization efficiency can be further increased.
[0021]
The distributor 5 is formed by connecting the hoppers 51 in two units formed by combining a hopper 51 and a screw conveyor 52, and the flow of the dried product P is caused by a distributor 53 provided above the hopper 51. A device for selecting a path. For this reason, the discharge part of one screw conveyor 52 is connected to the return port 12 b in the flow chamber 12, and the discharge part of the other screw conveyor 52 is connected to the cyclone 6.
The path connecting the fluidized bed dryer 1 and the bag filter 4, the bag filter 4 and the distributor 5, and the path connecting the distributor 5 and the fluidized bed dryer 1 are closed to the outside by, for example, a pipe. It is possible to prevent contamination and propagation of germs by creating a space.
[0022]
The emergency discharge device 7 closes the emergency discharge port 12c in the flow chamber 12 by a lid 71 attached to the rod of the cylinder 70. The emergency discharge port 12c is opened in an emergency or the like to open the raw material M or the like. It is a device for discharging.
[0023]
The high water content organic residue drying apparatus D of the present invention is configured as described above as an example, and the operation method of this apparatus and the “high water content organic residue drying method” of the present invention will be described below.
First, the fluidized air supply device 3 and the stirring device 15 are started, and hot air (as an example, 230 ° C., fluidized air velocity 5 m / s) is supplied from the fluidized air blowing chamber 11 into the fluidized chamber 12 and three dispersed blades. Is rotated (as an example, 660 rpm).
[0024]
Next, Okara (water content 83% WB), which is the raw material M, is put into the hopper 21 in the raw material supply device 2 and is fed into the branch pipe 23 by the screw conveyor 22 (1000 kg / hr as an example). The raw material M reaching the branch pipe 23 is supplied to the two inlets 12a shifted by 90 ° in plan view. At this time, since the raw material M passes through the static mixer 25, the flow chamber 12 is improved in dispersibility. Will be put in. The raw material M that has reached the fluid chamber 12 is immediately dispersed by the upper dispersion blade 151 and then blown up by hot air to form a fluidized bed.
[0025]
Further, the dried product P obtained by the previous operation is put into the flow chamber 12 (as an example, 500 kg / hr), and the screw conveyor 52 is started. The dried product P that has reached the flow chamber 12 is immediately dispersed by the middle stage dispersion blade 152 and forms a fluidized bed while being stirred together with the raw material M. By such an operation, the moisture content of the raw material M located in the flow chamber 12 is lowered, and the adhesion of the raw material M to the flow chamber 12 and the occurrence of lumps can be prevented.
[0026]
Thereafter, the raw material M is moved upward in the form of powder as the water content decreases, and is eventually discharged from the exhaust port 13a to the outside of the fluidized bed dryer 1 when it becomes a dry product P. .
Subsequently, the dried product P reaches the bag filter 4, and the dried product P is separated from the gas and sent to the distributor 5 by the screw conveyor 42.
[0027]
In the distributor 5, the dried product P is distributed to the two hoppers 51 by the distributor 53. In this embodiment, the dried product P is returned to the fluid chamber 12 at a rate of 500 kg / hr. However, this ratio is changed according to the properties of the raw material M. Thereafter, the dried product P is thrown into the fluidized chamber 12, and the dried product P reaching the fluidized chamber 12 is immediately dispersed by the middle stage dispersion blade 152 and stirred with the raw material M while fluidizing the fluidized bed. Form.
On the other hand, the remaining dry product P is sent to the cyclone 6 and is taken out as a product therefrom.
[0028]
【The invention's effect】
According to the present invention, the mixing property of the raw material M and the dried product P is improved, and a residue substance having a high water content such as okara can be dried without adhering in the fluidized bed dryer 1. In addition, a more uniform dried product P can be obtained.
In addition, since a dedicated mixing device is not required, the device and the process can be simplified, and a hotbed of various bacteria can be eliminated.
Further, since the mixing of the raw material M and the dried product P is performed in the flow chamber 12 having excellent sanitary properties, maintenance can be easily performed.
In addition, since the dispersibility of the raw material M is improved, it is possible to shorten the time until the raw material M becomes the dry product P, and further, it is possible to reduce the amount of the dry product P input to the flow chamber 12.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a highly water-containing organic residue drying apparatus of the present invention.
FIG. 2 is a perspective view partially showing a fluidized bed dryer.
FIG. 3 is a plan view and a side view showing a dispersion blade, and a side view showing a blade plate.
FIG. 4 is a perspective view showing a dispersion blade having a different form.
FIG. 5 is a plan view showing a fluid chamber and members connected to the fluid chamber.
FIG. 6 is a block diagram showing a conventional drying apparatus.
[Explanation of symbols]
D Drying device for high water content organic residue 1 Fluidized bed dryer 11 Fluidized air blowing chamber 11a Blowing port 11b Falling material discharge port 11c Valve 12 Flowing chamber 12a Input port 12b Return port 12c Emergency discharge port 13 Exhaust chamber 13a Exhaust port 14 Dish Plate 15 Stirrer 150 Rotating shaft 151 Upper dispersion blade 152 Middle dispersion blade 153 Lower dispersion blade 153 Lower dispersion blade 155 Blade plate 155a Notch 156 Rod 157 Motor 158 Auxiliary dispersion blade 159 Upper plate 2 Raw material supply device 21 Hopper 22 Screw conveyor 23 Branch pipe 24 Flexible tube 25 Static mixer 3 Fluid air supply device 31 Heater 32 Blower 33 Valve 4 Bag filter 40 Housing 41 Filter element 42 Screw conveyor 5 Distributor 51 Hopper 52 Screw conveyor 53 Distributor 6 Cyclone 7 Sudden discharge device 70 a cylinder 71 a lid M raw material P dry product

Claims (4)

A fluid wind blowing chamber, a fluid chamber and an exhaust chamber are connected in the vertical direction, and a countersink plate is provided as a partition between the fluid wind blowing chamber and the fluid chamber, and is supplied to the fluid chamber through the fluid wind blowing chamber. In the method of drying the raw material supplied into the fluid chamber with hot air, a part of the dried product discharged to the outside through the exhaust chamber after the drying process is performed in the fluid chamber is re-injected into the fluid chamber. The raw material newly supplied in the flow chamber and the dried product that has been re-introduced are provided with a blade plate that faces the raw material input port and the return port of the dry product, and is provided in the flow chamber. A method for drying a highly water-containing organic residue, wherein the drying is performed in a state where the water content of the raw material located in the fluid chamber is reduced by mixing with a dispersion blade . After passing through the raw material to a static mixer, a high water-containing organic residue method of drying according to claim 1, wherein the introducing to the flow chamber. The fluid wind blowing chamber, the fluid chamber, and the exhaust chamber are connected in the vertical direction, and a countersink is provided as a partition between the fluid wind blowing chamber and the fluid chamber, and is supplied to the fluid chamber through the fluid wind blowing chamber. In the apparatus for drying the raw material supplied into the fluidized chamber with hot air, the apparatus has means for again feeding the dried product discharged from the exhaust chamber into the fluidized chamber, and the material inlet and the drying are provided in the fluidized chamber. A highly water-containing organic residue drying apparatus comprising a dispersion wing provided with a wing plate positioned facing a product return port . 4. The high water content organic residue drying apparatus according to claim 3 , wherein a static mixer is provided at an input port of the raw material in the flow chamber.

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