WO2013054606A1 - 粉粒体殺菌装置 - Google Patents

粉粒体殺菌装置 Download PDF

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Publication number
WO2013054606A1
WO2013054606A1 PCT/JP2012/072134 JP2012072134W WO2013054606A1 WO 2013054606 A1 WO2013054606 A1 WO 2013054606A1 JP 2012072134 W JP2012072134 W JP 2012072134W WO 2013054606 A1 WO2013054606 A1 WO 2013054606A1
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WO
WIPO (PCT)
Prior art keywords
sterilization
granular material
transport pipe
airflow
powder
Prior art date
Application number
PCT/JP2012/072134
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
潤二 斉藤
弘文 二宮
和憲 松本
茂治 永越
英史 内山
信行 能島
誠二 織田
康司 大堀
Original Assignee
立山マシン株式会社
Ｍｒｃポリサッカライド株式会社
富山県
三菱化学エンジニアリング株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 立山マシン株式会社, Ｍｒｃポリサッカライド株式会社, 富山県, 三菱化学エンジニアリング株式会社 filed Critical 立山マシン株式会社
Priority to CN201280050052.9A priority Critical patent/CN104114194B/zh
Priority to KR1020147012203A priority patent/KR101712712B1/ko
Priority to JP2012544358A priority patent/JP6142119B2/ja
Publication of WO2013054606A1 publication Critical patent/WO2013054606A1/ja

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    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/26—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by irradiation without heating
    • A23L3/28—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by irradiation without heating with ultraviolet light
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/0005—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts
    • A61L2/0011—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts using physical methods
    • A61L2/0029—Radiation
    • A61L2/0047—Ultraviolet radiation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
    • A61L2/08—Radiation
    • A61L2/10—Ultraviolet radiation

Definitions

  • the present invention relates to a granular material sterilizing apparatus for sterilizing a granular material such as foods, food additives, and pharmaceuticals by irradiating ultraviolet rays or the like.
  • a method for sterilizing bacteria, mold, yeast, etc. a method using a gas such as ethylene oxide and ozone, a method using radiation, a method using heating, and a method using ultraviolet rays are known.
  • An appropriate sterilization method has been selected and adopted in accordance with the properties and the required degree of sterilization.
  • sterilization with ultraviolet rays does not have the above-mentioned problems, but there is a problem that it is not easy to sterilize a large amount of powder particles uniformly. Even if ultraviolet rays are irradiated on the powder particles thickly loaded on a tray etc., only the surface layer part is irradiated with ultraviolet rays, so only the surface layer part can be sterilized, and the internal powder particles existing in bulk form can be sterilized. This is because it cannot be done. Therefore, sterilization with ultraviolet rays has been used only for surface sterilization applications such as water sterilization, air sterilization, and food packaging materials.
  • Patent Document 1 describes a powder sterilizer including a rotating drum installed to be inclined in the rotating shaft direction and an ultraviolet lamp provided at the position of the rotating shaft in the rotating drum. .
  • This powder sterilization apparatus continuously puts the powder of the sterilization object from one end on the high side of the rotary drum, and applies ultraviolet light to the sterilization target while mechanically stirring the sterilization target in the rotary drum. It comes to irradiate.
  • Patent Document 2 describes a sterilization apparatus including a screw conveyor having spiral blades and a source of sterilizing radiation such as an ultraviolet lamp.
  • the screw conveyor is formed by forming spiral blades inside a pipe portion made of an ultraviolet light transmissive material, and the ultraviolet lamp is disposed outside the pipe portion.
  • powder particles of an object to be sterilized are continuously charged to the start end side of the screw conveyor, and the object to be sterilized is irradiated with ultraviolet rays while being stirred with the screw.
  • Patent Document 3 discloses a powder and ultraviolet sterilization method including a cylindrical container, a vortex impeller provided at the center inside the bottom, and a plurality of ultraviolet lamps installed in a space above the vortex impeller in the cylindrical container.
  • An apparatus is disclosed.
  • the vortex impeller can generate an air flow (vortex) that flows upward.
  • the powder UV sterilizer puts the powder to be sterilized above the vortex impeller, and irradiates the sterilization object with ultraviolet rays while dispersing the sterilization object in the space by the vortex created by the vortex impeller. And sterilize.
  • Patent Document 4 discloses an ultraviolet ray provided with a cylindrical casing, a conveyance tube disposed inside the casing and extending spirally along the axis of the casing, and an ultraviolet lamp that irradiates the ultraviolet ray sterilization lamp on the conveyance tube.
  • a sterilizer is described.
  • the transport tube is made of an ultraviolet light transmissive material so that the ultraviolet light irradiated from the ultraviolet lamp can pass through the tube.
  • the ultraviolet sterilization apparatus is configured to continuously put powder, which is an object to be sterilized, into a conveyance tube, and to irradiate the object to be sterilized with ultraviolet rays while conveying the sterilization object in the conveyance tube by air. Further, in order to prevent the surface of the transfer tube and the powder transferred in the transfer tube from being charged, the transfer tube is grounded.
  • the particulate UV sterilizer of Patent Document 3 has a problem that the particulates cannot be processed continuously and the working efficiency is low.
  • the sterilization effect by ultraviolet rays is proportional to the inverse of the square of the distance between the sterilization object and the ultraviolet light source, it is preferable to keep the distance between all the sterilization objects and the ultraviolet light source uniform.
  • the vortex impeller of the granular ultraviolet sterilizer described in Patent Document 3 includes a rotating shaft connected to a motor, and the rotating shaft of the vortex impeller passes through a cylindrical container and is connected to the motor. Yes. In order to ensure the sealing performance of the cylindrical container, it is necessary to provide a mechanical seal or the like at a location where the rotating shaft penetrates.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a powder sterilization apparatus capable of sterilizing a large amount of powder particles uniformly and efficiently without unevenness.
  • the present invention provides an introduction port for introducing a granular material, a sterilization treatment space for applying a sterilizing electromagnetic wave to the granular material introduced from the introduction port, and this
  • a sterilization transport pipe having a discharge port for discharging powder sterilized in the sterilization processing space, and the flow through the sterilization processing space from the introduction port to the discharge port, and the granular material from the introduction port to the discharge port
  • An airflow generation device that generates an airflow for transporting the airflow and an airflow adjustment structure that adjusts the direction in which the airflow generated by the airflow generation device flows in the sterilization transport pipe.
  • the direction of the airflow flowing in the sterilization treatment space extending in the axial direction of the sterilization transport pipe can be adjusted by the airflow adjustment mechanism. And by adjusting the direction of the air flow, it is possible to adjust the transport path of the granular material that is transported on the air flow, thereby adjusting the time to stay in the sterilization treatment space it can. Thereby, it is possible to apply a bactericidal electromagnetic wave over a long time to the powder particles moving in the sterilization treatment space, and the powder particles can be uniformly sterilized.
  • this invention can sterilize in a sterilization processing space, introduce
  • transducing a granular material into the transport pipe for sterilization from an inlet, and discharging the sterilized granular material from a discharge port.
  • the sterilization transport pipe has a granular material flowing in the sterilization treatment space and a charge suppression structure for suppressing charging of the sterilization transport pipe.
  • the charge suppression structure preferably suppresses the charge amount on the surface of the sterilization transport tube to 4 kV or less.
  • the charge suppression structure includes a conductor that is provided inside the sterilization transport pipe and is grounded to the ground potential.
  • the air flow adjusting structure is configured so that the air flow generated by the air flow generating device flows in a tangential direction of the inner peripheral surface of the sterilization transport pipe after passing through the introduction port. Adjust the direction.
  • the air flow can flow along the inner peripheral surface of the sterilization transport pipe after the air flow flows into the sterilization transport pipe from the introduction port.
  • an air flow can be made to flow in the direction of a discharge port, spirally turning in the sterilization processing space along the inner peripheral surface of the sterilization transport pipe.
  • the airflow adjustment structure is an adjustment member that is disposed in the sterilization treatment space and is provided with a spiral groove extending from the inlet side toward the outlet side.
  • the groove of the adjustment member decelerates the axial velocity of the air flow more than when entering the groove of the adjustment member, and the direction of the air flow coming out of the groove along the inner peripheral surface of the sterilization transport pipe
  • the shape is determined so that it flows.
  • the adjustment member disposed in the processing space for sterilization reduces the axial velocity of the airflow more than when entering the groove of the adjustment member, and transport for sterilization.
  • the direction can be directed along the inner peripheral surface of the tube.
  • the space between the spirals of the air flow is made narrower than when flowing into the groove of the adjusting member. be able to.
  • the time for the air flow to stay in the sterilization treatment space can be lengthened. Thereby, the time which the granular material on the airflow stays in the sterilization processing space can be lengthened, and the sterilization processing efficiency of the granular material can be increased.
  • a bar member extending in the axial direction of the sterilization transport pipe is disposed in the sterilization transport pipe, and the outer peripheral surface of the bar member is mirror-finished.
  • the bactericidal electromagnetic wave irradiated from the outside of the sterilization transport pipe can be selectively reflected in the radial direction of the bar member without being irregularly reflected by the outer peripheral surface of the bar member. it can. Thereby, a granular material can be sterilized more efficiently.
  • At least the outer surface of the bar member is formed of a conductor, and the conductor is grounded to a ground potential.
  • the rod member can suppress the charging of the granular material flowing in the sterilization treatment space and the transport pipe for sterilization, and thereby the dust explosion in the sterilization treatment space. Can be prevented from occurring.
  • the bactericidal electromagnetic wave is ultraviolet light.
  • FIG. 1 is a front view showing a granular material sterilizer according to an embodiment of the present invention.
  • the granular material sterilization apparatus 1 includes a granular material supply unit 3 for supplying a granular material W to be sterilized and a granular material W supplied from the granular material supply unit 3.
  • the sterilization processing unit 5 for sterilizing the powder the granular material recovery unit 7 for recovering the sterilized granular material W, the granular material supply unit 3, the sterilization processing unit 5 and the granular material recovery unit 7
  • An airflow generation unit 9 that generates an airflow for conveying the body W is provided, and each unit is connected in this order via a predetermined transport pipe.
  • the granular material supply unit 3 quantitatively supplies the main hopper 11 into which the granular material W to be sterilized and the granular material W accommodated in the main hopper 11 are supplied to the auxiliary hopper 13 quantitatively.
  • Device 15. The auxiliary hopper 13 is provided with a HEPA filter (High Efficiency Particulate Air Filter) 17 for sterilization, and air is introduced into the auxiliary hopper 13 via the HEPA filter 17 by the suction force generated by the airflow generation unit 9. Is configured to capture.
  • an electromagnetic vibrator (not shown) for preventing clogging of the granular material W is provided in the auxiliary hopper 13.
  • the granular material W carried into the auxiliary hopper 13 from the main hopper 11 is carried into the sterilization processing unit 5 through the carrying-in transport pipe 19 extending between the granular material supply unit 3 and the sterilization processing unit 5.
  • the granular material W that has entered the carry-in transport pipe 19 rides on the air flow generated by the suction force from the airflow generation unit 9 and diffuses in the carry-in transport pipe 19 to be sterilized as a granular material flow W1. Flows to 5.
  • the carrying-in transport pipe 19 is a pipe body that connects the auxiliary hopper 13 and the sterilization processing unit 5, and a HEPA filter 21 is attached to one end thereof.
  • the carry-in transport pipe 19 takes in outside air via the HEPA filter 21 on the upstream side of the auxiliary hopper 13 by the suction force of the airflow generation unit 9 and flows it toward the downstream side.
  • a sterilizing filter that can be detached is installed near the entrance of the main hopper 11 so as to prevent germs from entering the main hopper 11.
  • a filter in the vicinity of the inlet of the main hopper 11, it is possible to more effectively prevent foreign matters and bacteria from being mixed, whether air is sucked or discharged.
  • the kind of gas used for conveying the granular material W is not limited to air, and can be selected as appropriate.
  • a gas used for transporting the granular material W nitrogen, argon, or the like can be used in addition to easily usable air.
  • the granular material W in the present embodiment includes powder and granular material.
  • the powder is an aggregate of particles having a longest diameter of 1 mm or less, and the form is not limited.
  • the granular material includes forms such as a granular shape, a pellet shape, a chip shape, a fiber shape, and a flake shape, and the size is not particularly limited, and can be conveyed in the carrying-in transport pipe 19. Anything is acceptable.
  • the type and composition of the powder W are not particularly limited.
  • the powder W include powdered food such as wheat flour, rice flour, soybean flour, starch, coffee powder / granules, powdered dairy products, dried vegetables, dried seaweed, dried fruits, freeze-dried foods, etc.
  • Obtained granular health foods such as salt, sugar, umami seasonings, spices; guar gum, carrageenan, pectin, locust bean gum, gum arabic, xanthan gum, tara gum, karaya gum, agar, glucomannan, tamarind seed gum And food additives such as psyllium seed gum; powdered pharmaceuticals; powdered quasi-drugs; seeds such as rice, wheat, soybeans, vegetables and pepper.
  • the sterilization processing unit 5 includes a sterilization transport pipe 23 through which the granular material flow W ⁇ b> 1 sent from the carry-in transport pipe 19 passes, and a sterilization transport pipe from the outside of the sterilization transport pipe 23.
  • a plurality of ultraviolet irradiation lamps 25 for irradiating ultraviolet rays toward the tube 23 are provided.
  • the sterilization transport pipe 23 is formed of a linearly extending tubular body having one end connected to the carry-in transport pipe 19 and the other end connected to the carry-out transport pipe 27.
  • the sterilization transport pipe 23 has a circular cross section having substantially the same diameter from one end to the other end. Further, the sterilization transport pipe 23 is provided with an introduction port 29 for receiving the granular material flow W1 on one end side, and a discharge port 31 for discharging the granular material flow W1 on the other end side.
  • the discharge port 31 of the sterilization transport pipe 23 is connected to the granular material collection unit 7 via the carry-out transport pipe 27.
  • the sterilization transport tube 23 is formed of a material that transmits ultraviolet rays irradiated from the ultraviolet irradiation lamp 25.
  • the sterilization transport tube 23 examples include a quartz glass tube, an ultraviolet transmissive fluororesin tube, and Teflon (registered trademark). ) A pipe etc. can be used. Further, when a quartz glass tube is adopted as the sterilization transport tube 23, it is preferable to use a quartz glass tube having an ultraviolet transmittance of 70% or more. Alternatively, the sterilization transport pipe 23 may be formed of a conductor and grounded to a ground potential. Thereby, electrification of granular material W and sterilization transport pipe 23 can be controlled. The capacity and thickness inside the sterilization transport pipe 23 can be appropriately selected according to the scale of the powder sterilizer 1. In particular, the thickness of the sterilization transport pipe 23 needs to be set so as to ensure mechanical strength against negative pressure by suction or pressurization by discharged gas.
  • the sterilization transport pipe 23 extends in a substantially vertical direction, and a carrying transport pipe 19 extending in a substantially horizontal direction is connected to one end (lower end) thereof.
  • the granular material flow W ⁇ b> 1 carried in from the carry-in transport pipe 19 is carried into the sterilization transport pipe 23 from one end of the sterilization transport pipe 23.
  • the carry-in transport pipe 19 is connected to the sterilization transport pipe 23 so as to extend in the tangential direction of the horizontal cross section of the sterilization transport pipe 23.
  • the carry-in transport pipe 19 and the sterilization transport pipe 23 are When the connecting portion is viewed from above (FIG. 4), the inner wall of the carrying transport pipe 19 is connected to the inner peripheral surface of the sterilizing transport pipe 23 so as to be smoothly continuous.
  • the direction of the granular material flow W ⁇ b> 1 is adjusted to the tangential direction of the inner peripheral surface of the sterilization transport pipe 23 after the air flow enters the inlet 29 by the carry-in transport pipe 19 and the sterilization transport pipe 23.
  • the granular material flow W1 is along the inner peripheral surface of the transport pipe 19 for sterilization by the resultant force of the suction input from the discharge port 31 side of the transport pipe 23 for sterilization and the propulsive force in the tangential direction of the horizontal section. Ascend while spirally turning.
  • a plurality of ultraviolet irradiation lamps 25 are arranged around the sterilization transport tube 23.
  • the plurality of ultraviolet irradiation lamps 25 are, for example, straight tube lamps extending in parallel with the sterilization transport tube 23, and around the sterilization transport tube 23 so as to form a concentric ring with the sterilization transport tube 23. They are arranged at equal intervals.
  • the shape and number of the ultraviolet irradiation lamps 25 are appropriately selected according to the scale of the powder sterilizer 1 so that the powder W can be sufficiently sterilized.
  • strength which irradiates an ultraviolet-ray can also be suitably selected according to the scale of the granular material sterilizer 1, the kind and quantity, etc. of the granular material W used as the sterilization processing object.
  • the sterilization transport pipe 23 has a rod member 33 arranged concentrically with the sterilization transport pipe 23 therein.
  • FIG. 5 is a cross-sectional view showing the internal structure of the sterilization transport pipe.
  • the bar member 33 has substantially the same length as the sterilization transport pipe 23 and is disposed inside the sterilization transport pipe 23 so as to extend over the entire length of the sterilization transport pipe 23.
  • the rod member 33 is a cylindrical member or a columnar member having a diameter smaller than the inner diameter of the sterilization transport pipe 23, and is held by the support member 35 at a position away from the inner peripheral surface of the sterilization transport pipe 23.
  • a cylindrical sterilization treatment space 37 is formed between the inner peripheral surface of the sterilization transport pipe 23 and the outer peripheral surface of the bar member 33.
  • the rod member 33 is preferably formed of a conductor such as metal, and is preferably grounded to the ground potential through the support member 35, for example. Thereby, electrification of granular material W and transportation pipe 23 for sterilization can be controlled. Moreover, it is preferable that the outer peripheral surface of the rod member 33 is mirror-finished. Thereby, the ultraviolet rays irradiated from the ultraviolet irradiation lamp 25 can be selectively reflected in the radial direction of the bar member 33 without irregular reflection, and the powder W can be sterilized more efficiently.
  • the bar member 33 may be formed from one member, or may be formed by connecting several members.
  • the adjustment member 39 for adjusting the direction of the airflow in the cylindrical sterilization treatment space 37 in the sterilization transport pipe 23 may be installed in one or a plurality of locations of one bar member.
  • the rod member 33 is formed by connecting three cylindrical members or columnar members 33a, 33b, and 33c. And the connection part of each cylindrical member or columnar member 33a, 33b, 33c is connected by the adjustment member 39 for adjusting the direction of the airflow in the cylindrical sterilization processing space 37 in the sterilization transport pipe 23. Yes.
  • FIG. 6 is a three-side view showing the adjustment member.
  • the adjustment member 39 narrows the width of the spiral by adjusting the direction of the spiral air flow generated when the particulate flow W1 flows into the sterilization transport pipe 23 from the carry-in transport pipe 19 and thereby the sterilization flow. Increase the residence time of the airflow in the transport pipe.
  • the adjustment member 39 is formed by cutting a spiral groove 41 having a predetermined shape on the outer peripheral surface of a cylindrical body having an outer diameter substantially the same as the inner diameter of the sterilization transport pipe 23.
  • the adjustment member 39 is formed of a conductor such as metal, and the adjustment member 39 is fixed to the end of the cylindrical member or the columnar members 33a, 33b, and 33c constituting the rod member 33 using, for example, screws.
  • the adjacent cylindrical members or columnar members 33a, 33b, 33c are integrally held.
  • the adjustment member 39 charging of the granular material W and the transport pipe 23 for sterilization can be suppressed.
  • positioning the adjustment member 39 in the transport pipe 23 for sterilization the cylindrical sterilization processing space 37 in the transport pipe 23 for sterilization is substantially divided by the adjustment member 39, and the divided spaces are separated from each other. These are connected only by the groove 41 formed in the adjusting member 39.
  • the groove 41 has one spiral shape that goes around the circumference of the columnar adjustment member 39 along the outer periphery of the adjustment member 39.
  • the groove 41 is shaped so as to reduce the interval between the spiral airflows by increasing the axial velocity of the airflow and to increase the number of turns in the sterilization treatment space 37.
  • the groove 41 is shaped so that the axial velocity and axial acceleration of the airflow are once increased and then decreased in the groove 41, so that the granular material W stays and accumulates in the groove 41. Can be prevented.
  • the adjustment member 39 includes an inlet 41a formed on the bottom surface and an outlet 41b formed on the top surface, and the airflow rising while spirally turning in the sterilization treatment space 37 is generated. , And flows from the inlet 41a of the groove 41.
  • the inlet 41a is a substantially annular opening formed on the bottom surface of the adjusting member 39. As shown in FIG. 6, the inlet 41a has an angle around the axis of the adjusting member 39 starting from the inlet 41a of the groove 41 of the adjusting member 39. Open except for around 0 degrees. Therefore, the inlet 41a has substantially the same size as the horizontal cross section of the sterilization treatment space 37, and can receive a large amount of airflow.
  • the outlet 41b of the groove 41 is a semi-annular opening formed on the top surface of the adjustment member 39, and opens from 180 degrees (540 degrees) to 360 degrees (720 degrees) as shown in FIG. ing. Accordingly, the area of the outlet 41b is smaller than that of the inlet 41a.
  • the groove 41 is sharply narrowed immediately after entering the groove from the inlet 41a (360 degrees to 450 degrees), and extends in a substantially horizontal direction for a while (up to about 540 degrees).
  • the airflow flowing into the groove 41 is decelerated in the vertical direction so that the vertical velocity is substantially zero and is accelerated in the horizontal direction.
  • the bottom surface of the groove 41 is inclined upward, thereby slightly accelerating the airflow in the vertical direction.
  • the vertical speed at this time is slower than when the airflow flows into the groove 41.
  • the air flow released from the groove 41 into the sterilization space 37 rises in the sterilization space 37 while turning in a spiral with a narrower interval than when flowing into the adjustment member 39.
  • the granular material collection unit 7 includes a main collection unit 45 having a main storage unit 43 and an auxiliary collection unit 49 having an auxiliary storage unit 47.
  • the main recovery unit 45 separates the granular material flow W1 sent from the sterilization transport pipe 23 into the granular material W and air, collects the granular material W in the main storage unit 43, and supplies the air to the subsequent stage. Send to collection unit 49. Most of the granular material W contained in the granular material flow W1 is recovered in the main accommodating portion 43, but some fine granular materials W cannot be recovered and remain in the air. The fine granular material W is separated using the auxiliary recovery unit 49 and stored in the auxiliary storage unit 47.
  • the air flow generation unit 9 is connected to the downstream side of the auxiliary recovery unit 49.
  • the airflow generation unit 9 is configured by a blower that sucks air, and generates an airflow that flows from the upstream side toward the downstream side in the granular material supply unit 3, the sterilization processing unit 5, and the granular material recovery unit 7. Let Then, the air flow generation unit 9 discharges the air in the auxiliary recovery unit 49 located on the most downstream side of the granular material recovery unit 7 through the dust collection air filter 51 to the outside.
  • a blower is illustrated as the airflow generation unit 9.
  • the granular material W may be transported by providing a blower on the most downstream side of the transport path and sucking air. Then, a device for discharging air may be provided in the uppermost stream of the transport path, and the granular material W may be transported by sending air or the like.
  • the granular material flow W ⁇ b> 1 in which the granular material W is diffused in the air by the suction force of the airflow generation device 9 passes through the carrying transport pipe 19. It is sent to the introduction port 29 of the sterilization transport pipe 23. Since the carrying-in transport pipe 19 is connected to the sterilizing transport pipe 23 so as to extend in the tangential direction of the horizontal cross section of the sterilizing transport pipe 23, the sterilizing transport pipe 23 is connected to the introduction port 29 of the sterilizing transport pipe 23.
  • the granular material flow W ⁇ b> 1 that has flowed into the interior flows spirally in the cylindrical sterilization treatment space 37 while flowing in the direction of the discharge port 31 and reaches the upstream side of the adjustment member 39.
  • action when the granular material flow W1 flows through the inside of the adjustment member 39 is explained in full detail.
  • FIG. 7 is a graph showing the displacement, velocity, and acceleration of the granular material flow W1 flowing through the groove of the adjusting member.
  • the displacement s indicates the axial displacement of the granular material flow W1 in the adjusting member
  • the velocity v indicates the axial velocity of the granular material flow W1
  • the acceleration a indicates the granular material.
  • the axial acceleration of the flow W1 is shown
  • the angle ⁇ indicates the angle around the axis of the adjustment member starting from the inlet of the spiral flow path of the adjustment member.
  • the granular material flow W1 discharged to the cylindrical sterilization treatment space 37 is sterilized by receiving the ultraviolet rays irradiated from the ultraviolet irradiation lamp 25.
  • the granular material flow W1 becomes an ideal spiral flow by passing through the adjusting member 39, and the granular material W moving in the sterilization treatment space 37 is diffused well in the air without unevenness.
  • the individual powder particles W are likely to be irradiated with ultraviolet rays.
  • the sterilization treatment space 37 has a cylindrical shape due to the presence of the bar member 33, the thickness of the granular material flow W1 is thin and substantially uniform with respect to the ultraviolet irradiation, and the surface of the bar member 33 is exposed to the ultraviolet ray.
  • the circumferential speed of the granular material flow W1 becomes slow and the interval between the spirals widens.
  • the spiral is again adjusted to an ideal spiral flow. Accordingly, by disposing a plurality of adjusting members 39 at appropriate intervals in the axial direction, the granular material flow W1 becomes an ideal spiral flow at any position in the sterilization transport pipe 23, and the sterilization is efficiently performed. It can be performed.
  • the rod member 33 is made of a conductor such as metal and is grounded to the earth potential. Accordingly, it is possible to suppress the charging of the granular material flow W1 flowing inside the sterilization transport pipe 23 and the sterilization transport pipe 23, and to reliably prevent the occurrence of creeping discharge that leads to a dust explosion. .
  • the granular material flow W1 sterilized by passing through the sterilization transport pipe 23 is sent to the subsequent granular material collecting unit 7, and the granular material W as a product is separated and recovered from the granular material flow W1. Is done.
  • the granular material W to be sterilized is input to the granular material supply unit 3, and the sterilized granular material W is the granular material recovery unit. Until it is recovered at 7, the granular material W can be continuously transported and sterilized in the sealed space. Thereby, there is no possibility that the granular material W may be scattered outside the granular material sterilizing apparatus 1 or foreign matter may be mixed in from the outside, and handling of the granular material W is facilitated. Moreover, since there are few drive parts compared with the case where a screw conveyor etc. are used in conveying the granular material W, safety
  • security can be improved more.
  • the carrying transport pipe 19 and the sterilizing transport pipe 23 in the tangential direction and providing a plurality of adjusting members 39 in the sterilizing transport pipe 23, the granular material flow W1 flowing into the sterilizing transport pipe 23 is provided. It is possible to increase the staying time in the sterilization treatment space 37, thereby irradiating the ultraviolet rays of the ultraviolet irradiation lamps 25 evenly on the individual powder particles W and performing the sterilization treatment more effectively. Can do.
  • a cylindrical sterilization treatment space 37 is formed by the sterilization transport pipe 23 and the rod member 33, and the granular material flow W1 passes through the cylindrical sterilization treatment space 37. Since the granule moves along the inner wall of the sterilization transport pipe 23 by centrifugal force, the variation in the distance between the individual granule W and the ultraviolet irradiation lamp 25 can be reduced. In addition, since the surface of the bar member 33 is mirror-finished and ultraviolet rays can be selectively reflected in the radial direction of the bar member, the irradiation efficiency of the ultraviolet rays on the granular material W can be improved. Therefore, the granular material W can be sterilized more uniformly and efficiently.
  • a non-conductive quartz glass tube is used as the sterilization transport tube 23, but the powder flow W1 and the sterilization transport tube 23 are charged by a structure in which a metal rod member 33 is grounded to the ground potential. Since it can suppress reliably, the creeping discharge from the glass tube surface can be prevented reliably.
  • the granular material sterilizer 1 of this invention is not limited to the said embodiment.
  • the shape of the groove 41 of the adjusting member 39 may be different from the illustrated shape, and the powder flow W1 that spirals around the central axis of the sterilization transport tube 23 and passes through the inside thereof is axially directed. It only has to be able to decelerate.
  • the number of adjusting members 39 may be provided as many as necessary to continue the spiral flow of the granular material flow W1, and may be appropriately increased or decreased depending on the length of the sterilization transport pipe 23 and the like. it can.
  • the carrying transport pipe 19 is connected so as to extend in the tangential direction of the horizontal cross section of the sterilization transport pipe 23 so that the granular material flow W1 can flow spirally. If so, the adjustment member 39 may not be used. Further, by forming the adjustment member 39 in the vicinity of the introduction port 29 of the sterilization transport pipe 23, the connection direction of the carry-in transport pipe 19 and the sterilization transport pipe 23 is set in the tangential direction of the horizontal section of the sterilization transport pipe 23. There is no need to do it.
  • FIG. 8 is a cross-sectional view showing a modified example of the internal structure of the sterilization transport pipe.
  • a strip-shaped conductor 53 is wound around the sterilization transport pipe 23 as shown in FIG. 8, and the conductor 53 is grounded to the ground potential. Also good. In this case, by arranging the conductor 53 in a spiral shape and providing an interval between the respective windings, a gap through which ultraviolet rays pass can be ensured.
  • FIG. 9 is a cross-sectional view showing a further modification of the internal structure of the sterilization transport pipe.
  • the charge suppression performance can be further improved.
  • the charge suppressing structure for suppressing charging of the particulate flow W1 and the sterilization transport pipe 23 preferably suppresses the charge amount on the surface of the sterilization transport pipe 23 to 4 kV or less. Is 3 kV or less, more preferably 2 kV or less.
  • the structure of the granular material supply device and the granular material recovery unit of the present invention is not limited to the above-described configuration, and is a known quantitative supply device depending on the type and properties of the granular material to be sterilized. , Cyclones, etc. can be combined freely.
  • the ultraviolet ray generation source used for the granular material sterilization apparatus of the present invention is not limited, generally, a low pressure mercury sterilization lamp or a medium pressure mercury sterilization lamp can be used.
  • an ultraviolet ray source using a weakly ionized low temperature plasma for example, an apparatus disclosed in WO2009 / 123258
  • an ultraviolet ray source using a light emitting diode, an external electrode rare gas lamp, or the like can be used as an ultraviolet ray generation source. It is.
  • the structure of the joint portion between the carrying-in transport pipe 19 and the sterilization transport pipe 23 and the adjustment member 39 are given as examples of the airflow adjustment structure. Any structure can be used as long as the direction of the airflow in the transport pipe can be adjusted. For example, a structure described in JP-A-08-108935 that adjusts the direction of the airflow from the outside of the pipe is used. It is also possible.
  • the ultraviolet irradiation lamp As the ultraviolet irradiation lamp, a lamp that emits ultraviolet light centered on a wavelength of about 254 nm was used, and the effective light emission length was about 900 mm. Further, the distance from the outer periphery of the ultraviolet irradiation lamp to the outer peripheral surface of the rod member, that is, the longest distance from the ultraviolet irradiation lamp to the granular material flow W1 was about 20 mm. And since the ultraviolet rays of the three ultraviolet irradiation lamps adjacent to each other are irradiated to the sterilization transport tube and the ultraviolet rays are transmitted through the quartz glass, it is attenuated by about 15%. About 17 mW / cm 2 . However, when the reflected light from the outer peripheral surface of the bar member is considered, it can be seen that the actual ultraviolet illuminance is higher than about 17 mW / cm 2 .
  • the two adjusting members provided inside the sterilization transport pipe were cylindrical metal materials having a diameter of about 57 mm, and the depth of the groove was about 9.5 mm.
  • the ground structure shown in FIG. 9 was adopted as the ground structure that suppresses charging of the granular material flow W1 and the sterilization transport pipe.
  • the evaluation method for the number of viable bacteria is the number of colonies generated by diluting and dispersing 1 g of granular material in 99 mL of physiological saline, collecting 1 mL, pour it into a standard agar medium, and culturing at 36 ° C. for 48 hours. And the number of colonies was multiplied by 100 to obtain the number of bacteria per gram.
  • the following evaluation method was adopted for the number of spores.
  • 1 g of powder granules were diluted and dispersed in 99 mL of physiological saline, 5 mL of this diluted solution was collected, mixed in a standard agar medium, and heated for 10 minutes in a boiling water bath. The number of colonies generated after culturing at 36 ° C. for 48 hours was counted, and the number of colonies was multiplied by 20 to obtain the number of bacteria per 1 g.
  • thermophilic bacteria For aerobic thermophilic bacteria, 1 g of powder granules are diluted and dispersed in 99 mL of distilled water, 10 mL of this diluted solution is collected, mixed in dextrose tryptone agar medium, and heated for 20 minutes in a boiling water bath. The number of colonies generated after culturing at 55 ° C. for 48 hours was counted, and the number of colonies was multiplied by 10 to obtain the number of bacteria per 1 g.
  • Experiments 1 to 5 were performed using a quartz glass tube as a sterilization transport tube.
  • a powder additive of food additive (thickening stabilizer) guar gum manufactured by MRC polysaccharides: RG500, average particle size 82 ⁇ m
  • the sterilization treatment was performed under the condition of the exhausted air amount of 0.52 m 3 / min, and the number of general viable bacteria and the number of heat-resistant bacteria before and after sterilization were evaluated. The evaluation results are shown in Table 1.
  • the charging of the quartz glass surface of the sterilization transport tube 23 was suppressed to a low voltage of 1 kV or less throughout the sterilization time. If a high voltage exceeding 4 kV is generated, creeping discharge leading to a dust explosion may occur, but if it is 1 kV or less, there is no problem.
  • Experiment 5 As food granules and flakes, put 1kg of commercially available non-washed rice / green tea as sterilization target into the powder sterilizer 1, and sterilize under conditions of sterilization speed of 15kg / hour and exhaust air volume of 0.52m 3 / min. And the number of general viable bacteria before and after sterilization was evaluated. The evaluation results are shown in Table 4. The maximum charge on the quartz glass surface of the sterilization transport tube 23 is not washed rice, but because of green tea 0.5 kV granules and flakes, there is no risk of a dust explosion even if creeping discharge occurs. , Suppressed to a low voltage.
  • Experiments 6 to 7 were conducted by changing the quartz glass tube to a fluororesin (thickness 0.4 mm) tube as a transport tube for sterilization.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Nutrition Science (AREA)
  • Veterinary Medicine (AREA)
  • Polymers & Plastics (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Food Science & Technology (AREA)
  • Biomedical Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Molecular Biology (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Air Transport Of Granular Materials (AREA)
PCT/JP2012/072134 2011-10-12 2012-08-31 粉粒体殺菌装置 WO2013054606A1 (ja)

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CN104824785A (zh) * 2015-04-03 2015-08-12 安徽省农业科学院农产品加工研究所 一种粉粒体过热蒸汽连续灭菌装置及控制方法
RU205197U1 (ru) * 2020-07-06 2021-07-01 Петр Александрович Кулясов Камера облучения бактерицидного облучателя

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JPH09117494A (ja) * 1995-10-27 1997-05-06 Baruku Koki Kk 粉粒物殺菌装置
JPH10127737A (ja) * 1996-10-30 1998-05-19 Ransburg Ind Kk 紫外線殺菌装置
JP2002365400A (ja) * 2001-06-13 2002-12-18 Mitsubishi Heavy Ind Ltd 電子線照射装置及び照射方法

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KR20140077194A (ko) 2014-06-23
CN104114194A (zh) 2014-10-22

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