JP2007024385A - Drying method for high water content material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a drying method for a high water content material capable drying a high water content material more inexpensively. <P>SOLUTION: Hot air from a hot air generating source is supplied via a hot air supply passage 24 into a cylindrical hollow chamber housing a multiplicity of ceramic balls 11, and communicated with a lower end of a box tube like upper hollow chamber 23 having a takeout opening 26 for taking out dried powder and granular material. After interiors of the hollow chamber 22 and the upper hollow chamber 23 are heated to a predetermined temperature by the hot air, an object to be dried comprised by mixing and agitating the high water content material and the powder and granular material of bamboo blades and stems with a water content of 10-20% and a grain size of 0.1-10 mm such that the water content of the bamboo blades and stems is 80-85%, is supplied into the hollow chamber 22 via an object to be dried supply passage 25 and dried. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for drying a high moisture content material. Specifically, it is a method of mixing a granular material with a high moisture content substance such as an unnecessary residue produced in the production process of food and drink, and then drying and granulating the substance, and a high moisture content substance at a lower cost It is intended to provide a method for drying a high water content material that can be dried into granules.

  For example, among shochu that is a kind of distilled liquor, a large amount of unnecessary residue is produced in the manufacturing process of shochu called “real shochu”. That is, the original sake of shochu is first made by mixing koji molds with raw materials such as steamed cereals and koji. Next, adding water and yeast to the koji produces mash. If moromi is produced, the moromi is further mixed with raw materials such as cereal and water and fermented. Then, when the fermented moromi is distilled with a still, the alcohol content is evaporated, and the evaporated alcohol content is cooled and liquefied to become the raw sake of authentic shochu with an alcohol content of about 96 degrees.

  As described above, raw shochu for authentic shochu is produced. In the distillation process using a distiller, a large amount of unnecessary residue (hereinafter referred to as “squeezed lees”) is produced. This pomace is a high moisture content material having a solid content of 3% and a moisture content of 97%.

  In view of this, in order to facilitate the processing and handling of the high water content squeeze produced in large quantities, this squeeze has been conventionally dried, and the drying method will be described.

  In this conventional example, dried okara (dried granulated tofu husk), which is a granular material, is mixed with the pomace as a pre-process. The dried okara to be mixed has a water content of 5 to 10% and a particle size of 0.1 to 5 mm (5 to 250 mesh). The drying apparatus (see Japanese Patent No. 3182627) shown in FIG.

  In this drying apparatus, hot air, an object to be dried, and the like are placed in a cylindrical hollow chamber 22 that is installed on a base 21 and contains a large number of small-diameter (for example, 1.5 to 6.0 mm) ceramic balls 11 therein. To dry the material to be dried. The hollow chamber 22 communicates with the lower end of a box-shaped upper hollow chamber 23 disposed above.

  The hot air here is opened near the bottom of the hollow chamber 22 through the hot air supply path 24 that opens to the peripheral surface of the hollow chamber 22 and is disposed along the tangential direction of the circumference of the hollow chamber 22. It is supplied into the hollow chamber 22.

  Further, the supply of the material to be dried into the hollow chamber 22 is performed by continuously dropping the material to be dried accommodated in the hopper 28 into the hollow chamber 22 through the material supply path 25 by the operation of the rotary feeder 27. To do. The to-be-dried object supply path 25 is provided between the upper hollow chamber 23 and the hot air supply path 24 so as to protrude from the peripheral surface of the hollow chamber 22 and protrude. The tip opening portion of the drying object supply path 25 is a hot air flow straightening plate 29 having a circular arc cross section for preventing the drying object from receiving hot air and blowing into the drying object supply path 25 (FIG. 4). Thus, the upstream side of the hot airflow is partially shielded.

  In the case of this drying device, first, hot air from a hot air generator (not shown) is supplied into the hollow chamber 22 at a wind speed of 40 m / second or more, and the hollow chamber 22 and the upper hollow chamber 23 communicating with the hollow chamber 22 are supplied. Heat each interior. Accordingly, in the heated hollow chamber 22 and the upper hollow chamber 23, a large number of ceramic balls 11 accommodated in the hollow chamber 22 are blown away by hot air as shown in FIG. The inside of the hollow chamber 23 flies endlessly and vertically, and the collision with these inner walls is repeated.

  Therefore, when the inside of the hollow chamber 22 and the upper hollow chamber 23 is heated and reaches a predetermined temperature, the rotary feeder 27 is operated to continuously supply the tofu shell toward the bottom of the hollow chamber 22. The tofu husk dropped and supplied into the hollow chamber 22 receives the supplied hot air and is dried in the hollow chamber 22, and further drying is promoted in the upper hollow chamber 23. A temperature sensor is disposed in the upper hollow chamber 23, and a control unit (not shown) that receives the output of the temperature sensor so that the room temperature of the upper hollow chamber 23 is always 85 to 90 ° C. Based on the control signal from, the temperature of the supplied hot air (the temperature at the opening of the hot air supply passage 24 tip) is automatically controlled.

  The tofu shell is prevented from adhering to the inner walls of the hollow chamber 22 and the upper hollow chamber 23 by the large number of ceramic balls 11 that repeatedly collide with the inner wall of the hollow chamber 22 and the upper hollow chamber 23. Even if it adheres, it is scraped off. Therefore, the tofu shell does not stick to the inner walls of the hollow chamber 22 and the upper hollow chamber 23 and burn.

  The tofu husk dried in the hollow chamber 22 and further dried in the upper hollow chamber 23 to become powdery is passed through an outlet 26 projecting from the upper end of one side surface of the upper hollow chamber 23. The hot air is taken out from the drying device. After the tofu shell is supplied into the hollow chamber 22, the time required for the tofu shell to be dried to become powder and discharged from the outlet 26 is several seconds.

  As described above, dried okara having a water content of 5 to 10% and a particle size of 0.1 to 5 mm is obtained. Therefore, this dried okara is mixed with the original sake shochu. The mixing amount from dried okara is such that the moisture content from the dried okara that has been mixed with the squeezed rice cake and absorbed its moisture is 80 to 85%. As a weight ratio, the dried okara is 20 to 30% by weight based on the total weight of the dried okara and the squeezed rice cake.

  When the dried okara is mixed and stirred in the pomace, and the moisture of the pomace is sufficiently absorbed in the okara, the dried okara is dried and granulated using the drying apparatus shown in FIG. . Setting conditions of hot air speed and temperature when operating the device and operating state when operating the device are the same as when the tofu shell is dried and granulated, and the material to be dried is supplied into the hollow chamber 22 Then, within a few seconds, the dried okara and the solid content of the dried squeezed rice cake are taken out in the form of particles through the outlet 26.

  The granular material obtained in this way is a mixture of a composition such as cereals and moss, which is a solid content of squeezed rice cake, and dried granulated tofu husk, and according to the drying apparatus of FIG. In other words, since the material to be dried does not burn, it can be effectively used as fertilizer or livestock feed.

  In the above description, the case where the object to be dried is squeezed rice cake of authentic shochu, but in addition to this, there is no problem because blood and cracks of animals released in large quantities are generated when slaughtering meat animals. Tofu that has been excluded from the sale as non-defective products, unsold at stores, organs removed from the body of squid used for food, or milk unsold at stores can be made into dry powder by the above conventional example.

If only the high moisture content material is introduced into the hollow chamber 22 of the drying apparatus in FIG. 3 without mixing the dried okara with the high moisture content material, the high moisture content material remains liquid by the supplied hot air. While rising along the inner wall of the hollow chamber 22, it adheres to the entire inner wall of the hollow chamber 22 and the upper hollow chamber 23. Even if the ceramic ball 11 blown by hot air collides with the inner walls of the hollow chamber 22 and the upper hollow chamber 23, the high water content material adhering to the inner wall remains attached to these inner walls and peels off from the inner wall. There is no. As a result, the high water content substance adhering to the inner walls of the hollow chamber 22 and the upper hollow chamber 23 receives hot air and the water is evaporated, and then burns to the entire inner wall of the hollow chamber 22 and the upper hollow chamber 23. Become.
Japanese Patent Application No. 2004-123815

  According to the conventional example in which dried okara is mixed with a substance having a high water content and then dried as dry matter, there are the following problems to be solved. That is, prior to drying the mixture of dried okara and high moisture content material, when the tofu shell is dried by the drying device of FIG. 3, the hot air supplied into the hollow chamber 22 through the hot air supply path 24 The temperature is about 600 ° C. at the front end opening of the hot air supply path 24 regardless of the size of the hollow chamber 22.

  However, the heat source of the hot air generator used in this drying apparatus is a gas burner, and the gas used is propane gas. However, when propane gas is used as fuel, the fuel cost required for dry granulation of tofu shell is about 2.5 yen per 1 kg of tofu shell, assuming that 1 kg of propane gas averages 80 yen. If it is intended to dry-granulate a large amount of tofu husks by continuous operation, the fuel cost will be high.

  That is, according to the conventional example in which dried okara is mixed with a high moisture content substance and stirred, and this is dried as an object to be dried by the drying apparatus of FIG. 3, the cost for obtaining dried okara increases. However, there is a problem to be solved that the cost required for drying the high water content substance is also increased.

  Accordingly, the present invention has been made in view of the above problems. For this purpose, dry okara is used as the powder to be mixed with the high water content substance in the conventional example, whereas in the present invention, dry bamboo leaf and stem powder is used. Then, the dried bamboo leaf and stalk granules are mixed with a high moisture content substance to be dried and stirred, and the mixture and stirred are used as the material to be dried. Therefore, the material to be dried is supplied into a hollow chamber communicating with the upper hollow chamber disposed above where hot air is supplied and many ceramic balls fly. The above means is used in the present invention.

  According to the present invention, the hot air necessary for obtaining dry bamboo leaf / stem powder mixed with a high water content substance is sufficient at a lower temperature than in the conventional example, and is necessary for generating hot air. The fuel cost can be significantly reduced. As a result, the cost for drying the high water content material can be reduced. In addition, since the bamboo leaves and stems are used, it is possible to effectively use bamboos that are often considered unnecessary.

  In the present invention, first, powdered bamboo leaves and stems having a moisture content of 10 to 20% are mixed with a high moisture content substance and stirred. In this case, the mixing amount of the bamboo leaf / stem powder particles is such that the bamboo leaf / stem powder particles that have absorbed the moisture of the high water content substance have a moisture content of 80 to 85%. Next, a hollow chamber communicating with an upper hollow chamber disposed above, containing a large number of ceramic balls, with a high water content substance and bamboo leaf / stem powder mixed and stirred as a material to be dried In addition, the material to be dried is continuously supplied and dried by hot air supplied into the hollow chamber. Hereinafter, the embodiment will be described in detail.

  As an embodiment of the present invention, a method for drying the squeezed koji of an authentic shochu raw sake will be described. As described above, in the method for drying a high water content material according to the present invention, before drying the high water content material, bamboo leaf / stem powder is mixed with the high water content material. Here, the bamboo leaves and stems are pulverized by, for example, a known hulling machine (love machine) shown in FIG.

  As shown in FIG. 1 (a) (side view showing a part of a cross section), the hulling machine has a substantially rectangular trapezoidal inlet 1 into which an object to be processed is opened. Bamboo harvested through mouth 1 is thrown in. As shown in FIG. 1 (b) (plan view), two screw feeders 3a and 3b fixed to the outer peripheral surfaces of the rotary shafts 2a and 2b are disposed below the insertion port 1, respectively. By these driving, the thrown-in bamboo is sent toward each cutting edge 4a, 4b, 5a, 5b.

  The bamboo leaves and stems sent by the screw feeders 3a and 3b are first roughly broken into pieces by one of the cutting blades 4a and 4b. It is refined by the blades 5a and 5b to form a granular material. Bamboo leaves and stems in the form of particles are discharged through a discharge port 6 provided on the lower front side of each cutting blade 5a, 5b. The particle diameter of the bamboo leaves and stems discharged is 0.1 to 10 mm (5 to 500 mesh).

  Therefore, the bamboo leaf / stem powder particles obtained in this manner are dried by a drying apparatus shown in FIG. 2 so that the moisture content is 10 to 20% (14.5% is optimal). The drying apparatus here has the same configuration as the drying apparatus used in the conventional example shown in FIG. 3, and the operating state when the apparatus is operated is also the same. However, the temperature of the hot air supplied from the hot air generator is different from the temperature when the tofu shell is dried and granulated in the conventional example.

  That is, the temperature of the hot air supplied into the hollow chamber 22 via the hot air supply path 24 when drying the tofu shell in the conventional example is about 600 ° C. at the front end opening of the hot air supply path 24. On the other hand, the temperature of the hot air using the same drying apparatus when drying the powder of bamboo leaves and stems in the present invention is about 150 ° C. at the opening of the hot air supply path 24. It is sufficient to supply hot air at this temperature. This is because the bamboo stalk has a porous structure, so that it has a larger surface area for adsorbing the squeezed potato than in the conventional example, and the moisture content of the bamboo leaves and stalks. Is about 40%, which is lower than the moisture content of tofu husk (about 80%).

  Comparing this with fuel costs, the fuel cost in the case of tofu husk is about 2.5 yen per kg of tofu husk, assuming that 1 kg of propane gas is an average of 80 yen as already mentioned. On the other hand, in the case of bamboo leaf / stem powder, the cost is 0.7 to 1.0 yen per kg, and the fuel cost can be significantly reduced as compared with the case where the tofu shell is dried. As a result, it is possible to realize a lower cost than when drying tofu shells even when considering the cost for granulating bamboo leaves and stems by the rice huller shown in FIG. .

  In this way, when drying the leaves and stems of bamboo, it is sufficient to supply hot air at a lower temperature than when drying the tofu husks. The leaf / stem powder is dried to a desired moisture content in a few seconds as in the case of drying the tofu shell and taken out through the outlet 26.

  Therefore, the bamboo leaf / stem powder particles dried to a moisture content of 10 to 20% by a drying device are mixed with the squeezed lees of the original sake of shochu. The mixing amount of the bamboo leaf / stem granule is such that the moisture content of the granule mixed with the squeezed rice cake and absorbed its moisture is 80-85% (weight ratio of bamboo The leaf / stem powder is 25 to 30% by weight based on the total weight of this and the squeezed potato.

  If the water content of the squeezed rice cake is sufficiently absorbed by the bamboo leaf / stem powder, it is dried by the drying apparatus of FIG. The setting conditions when the apparatus is operated and the operating state when the apparatus is operated are the same as in the case of drying the mixture of dried okara and squeezed rice cake in the conventional example. -The solid content of the dried pomace is taken out in the form of a granular material together with the granular material of the stem.

  In this way, if the powder of bamboo leaves and stems is used as the powder to be mixed with the raw shochu, the bamboo leaves and stem powder prior to mixing with the pomace The cost for drying the body is remarkably reduced as compared with the case of using dried okara, and as a result, the cost required for drying the squeezed rice cake can be reduced accordingly.

  Not only that, but today, the amount of bamboo used in Japan is extremely small. For this reason, there are many cases where bamboo forests are left as they are without being cut down and continue to multiply. Even if bamboo is cut down, it will grow again as long as the rhizome remains. Accordingly, the source of dried okara used in the conventional example is limited to tofu manufacturers, whereas the source of bamboo is not limited, and it is easy to secure as a material.

  Moreover, recently, the powdered bamboo leaves and stems have been used as livestock feed. The dried product obtained by the drying method in the present example is composed of a solid content which is a composition such as cereals and potatoes, which are raw materials for authentic shochu, and bamboo leaf / stem powder. That is, the usefulness as a livestock feed is further enhanced, and the drying apparatus shown in FIG. 2 does not burn the object to be dried. It can be used.

  In the above description, as a high moisture content material to be dried, the squeezed lees of the original sake of shochu was explained as an example. However, the high water content substance that can be dried by the drying method according to the present invention is not limited thereto. In addition, as described for the conventional example, the blood of animals released when slaughtering meat animals, organs removed from the body of edible squid, tofu and milk unsold in stores, etc. It is possible to dry by the drying method according to the invention.

It is a block diagram which shows the structural example of the hulling machine which pulverizes a bamboo leaf and stem. It is the perspective view which notched some drying apparatuses used in the drying method of the high moisture content substance by this invention. It is the perspective view which notched some drying apparatuses used in a prior art example. It is explanatory drawing for demonstrating the operation state of the drying apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input port 2a, 2b Rotating shaft 3a, 3b Screw feeder 4a, 4b, 5a, 5b Cutting blade 6 Discharge port 11 Ceramic ball 21 Base 22 Hollow chamber 23 Upper hollow chamber 24 Hot air supply path 25 Dry matter supply path 26 Outlet 27 Rotary feeder 28 Hopper 29 Thermal air flow straightening plate

Claims (1)

The upper hollow chamber (23) which accommodates a large number of ceramic balls (11) of a predetermined diameter and has a take-out port (26) for taking out the dried granular material formed in a box-like shape on one side surface. In a cylindrical hollow chamber (22) installed horizontally, communicating with the lower end of
Hot air from a hot air generating source is provided through a hot air supply path (24) disposed along the tangential direction of the circumference of the hollow chamber with the front end opened to the circumferential surface of the hollow chamber in the vicinity of the bottom of the hollow chamber. Supply
After the inside of the hollow chamber and the upper hollow chamber is heated by the hot air and reaches a predetermined temperature,
Bamboo leaf and stem powder having a water content of 10 to 20% and a particle size of 0.1 to 10 mm, and a high water content substance, so that the water content of the powder is 80 to 85% The material to be dried after mixing and stirring
Supplyed into the hollow chamber via a to-be-dried material supply path (25) provided with a tip opened to the peripheral surface of the hollow chamber and dried between the upper hollow chamber and the hot air supply path A method for drying high moisture content substances.

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