WO2017010131A1 - Appareil d'agitation et procédé d'agitation - Google Patents

Appareil d'agitation et procédé d'agitation Download PDF

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Publication number
WO2017010131A1
WO2017010131A1 PCT/JP2016/060501 JP2016060501W WO2017010131A1 WO 2017010131 A1 WO2017010131 A1 WO 2017010131A1 JP 2016060501 W JP2016060501 W JP 2016060501W WO 2017010131 A1 WO2017010131 A1 WO 2017010131A1
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WO
WIPO (PCT)
Prior art keywords
blade
stirring
tank
rotation
rotating
Prior art date
Application number
PCT/JP2016/060501
Other languages
English (en)
Japanese (ja)
Inventor
好一 加藤
直樹 岸
Original Assignee
佐竹化学機械工業株式会社
メタウォーター株式会社
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 佐竹化学機械工業株式会社, メタウォーター株式会社 filed Critical 佐竹化学機械工業株式会社
Publication of WO2017010131A1 publication Critical patent/WO2017010131A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application

Definitions

  • the present invention is an agitation device and an agitation method, such as a digester tank for treating raw sludge, surplus sludge, and garbage by methane fermentation, an agitator tank for stirring a mixture of liquid and slurry, a flat tank, etc. It is the stirring apparatus and stirring method used. Moreover, the stirring apparatus and stirring method of this invention are related with the stirring apparatus and stirring method which can be applied with respect to various stirring, such as liquid stirring, solid-liquid stirring, and gas-liquid stirring.
  • the sludge to be added contains inorganic solids and has a high sedimentation property. When these solids settle and accumulate at the bottom, the effective capacity in the digestion tank is reduced, and the digestibility is adversely affected.
  • FIG. 10 shows a stirring device a applied to a conventional biological treatment that solves the above-mentioned problems.
  • the stirring device a includes a cylindrical stirring vessel b, a plurality of radially extending stationary blades c provided at the bottom of the stirring vessel b, and an upper portion of the stationary blade c, provided near the lower part of the liquid level.
  • the rotary blade d includes, for example, four blade bodies e extending radially.
  • the blade body e is a straight rectangular strip-shaped flat paddle blade having a surface perpendicular to the rotation direction of the rotary blade d.
  • the conventional stirring device a can be operated with low shear and low power without damaging the carrier in the tank b. Moreover, in the said conventional stirring apparatus a, the inside of the stirring tank b can be stirred very uniformly and easily (patent document 1).
  • the conventional stirring device can be operated with low power, but in recent years, it is required to have lower power and the same stirring performance as in the past.
  • the present invention is a further improvement of the conventional stirring device, and an object thereof is to provide a stirring device with lower power and capable of stirring the inside of the stirring tank extremely uniformly.
  • the stirring device of the present invention comprises a stirring tank, a rotating blade provided in the stirring tank, and a radially extending stationary blade provided at the bottom of the stirring tank, and the rotating blade has one or more flat tapers. It consists of wings.
  • the flat taper blade is characterized in that the outer shape thereof is a shape in which the area gradually decreases outward from the rotation shaft of the stirring blade.
  • the flat tapered blade has a flat tapered blade whose outer shape is slanted linearly toward the upper side extending in the horizontal direction, the outer side extending in the vertical direction, the inner side extending in the vertical direction, and outward. It consists of a lower side extending upward.
  • the image forming apparatus further includes a rotation control device that controls the rotation of the rotor blades.
  • the rotation control device is a control device that changes a rotation speed of the rotor blade.
  • the stirring method of the present invention includes a stirring tank, a rotary blade composed of one or a plurality of flat taper blades provided in the stirring tank, a radially extending stationary blade provided at the bottom of the stirring tank, With the rotation control device of the stirring device comprising the rotation control device that controls the rotation of the rotor blades, at the first desired stirring rotation speed to such an extent that deposits such as slurry are generated at the bottom of the stirring tank, The first step of rotating the rotor blade for the first desired time, and the deposit accumulated at the bottom of the tank, which has been accelerated from the first stirring speed for the second desired time, is raised. A second step of rotating the rotor blade at a second stirring rotational speed, and a third step of repeating the first step and the second step as necessary. .
  • the rotation control device is a control device for rotating the rotating blades forward and backward.
  • the flat taper blade is provided so as to be tiltable with respect to the rotating shaft of the rotor blade.
  • the specific gravity of the flat tapered blade is smaller than the specific gravity of the liquid to be treated contained in the stirring tank.
  • the inside of the agitation tank can be agitated extremely uniformly and easily, and can be operated with lower power.
  • the wing body flat taper wing
  • the opening of the stirring tank can be made smaller.
  • it can apply also to a stirring tank with a small opening part.
  • the upward flow at the center in the tank can be discharged more effectively outward by the wing body (flat taper wing) than the conventional wing body.
  • the amount can be increased and the flow velocity at the bottom of the tank can be increased.
  • the same discharge amount or the same flow rate at the bottom of the layer can be obtained with a low power.
  • the average power can be reduced below the conventional level.
  • the opening of the stirring tank can be made small. Or according to this invention, it can apply also to a stirring tank with a small opening part. Or according to this invention, it becomes easy to take in and out from the opening part of a stirring tank, and a maintenance becomes easy.
  • FIG. 2 is a plan view taken along a line II in FIG. 1. It is an expansion front view for description of a wing body. It is a vertical front view for description of a conventional flat paddle blade. It is a vertical front view for description of the flat tarper wing of the present invention. It is a graph which shows the relationship between Reynolds number and power number. It is a vertical front view of the stirring apparatus of the other Example of Example 1 of this invention. It is an expansion front view for description of the rotary blade of Example 2 of the present invention. It is an expansion front view for description of the rotary blade of Example 2 of the present invention. It is a vertical front view of the conventional stirring apparatus.
  • Embodiment 1 of the present invention will be described with reference to FIGS.
  • Example 1 shows the stirring apparatus of Example 1 of the present invention.
  • 2 is a stirring tank of the stirring device 1, and the stirring tank 2 is formed in, for example, a vertical cylindrical shape, an elliptical cylindrical shape or a rectangular cylindrical shape having a diameter of 20 m.
  • An opening 3 and a lid 4 of the opening 3 are provided at the center of the ceiling 2 a of the stirring tank 2.
  • the rotor blade 5 indicates a rotor blade, and the rotor blade 5 is composed of, for example, four blades 6 that are radially fixed to the lower end of the rotating shaft 5a radially outward via a boss portion 5b.
  • the rotating shaft 5 a is provided so as to hang coaxially with the central axis of the stirring tank 2 and penetrate the lid portion 4. Further, the rotary blade 5 is inserted into the agitation tank 2.
  • the blade plate 6 is formed of a trapezoidal flat taper blade having a surface perpendicular to the rotation direction of the rotating shaft 5a. Further, the outer shape of the blade plate 6 is a shape in which the area gradually decreases outward from the rotating shaft 5a, for example, an upper side 6a extending in the horizontal direction, and an outer side 6b extending in the vertical direction, The inner side 6c extends in the vertical direction and the lower side 6d extends obliquely upward in a straight line toward the outside.
  • the stationary blade 8 indicates a stationary blade.
  • the stationary blade 8 is composed of, for example, a straight belt-like plate, and the belt-like plate is fixed, for example, four in a radial manner at the center of the bottom portion 2b in the agitation tank 2, and intersects the belt-like plates.
  • a gap is formed at the center of the bottom corresponding to the portion.
  • the liquid to be treated in the agitation tank 2 used as a digestion tank containing wastewater containing raw sludge, surplus sludge, raw garbage, etc., and a liquid to be treated that treats the wastewater and causes methane fermentation, etc. 1, the liquid to be treated generates a swirling flow along the inner peripheral surface of the agitation tank 2 that goes downward as shown in FIG. 1 and rises at the center by the stationary blade 8 of the bottom 2b.
  • the liquid to be treated circulates in the stirring tank.
  • the blade 6 made of the flat tapered blade of the present application can reduce the power number (Np) of the blade body as compared with the conventional flat paddle blade e.
  • the motor output (P) for rotating the rotor blades can be expressed by the power number (Np) ⁇ the number of rotations (N) 3 ⁇ the blade diameter (d) 5. Therefore, the motor output (P) is assumed to be constant. In this case, the rotational speed (N) can be increased by decreasing the power number (Np).
  • the flow rate at the bottom of the stirring tank is important, and this flow rate is related to the blade tip speed of the blade, and the blade of the blade
  • the blade plate 6 made of the flat taper blade of the present invention is used so that the blade plate 6 having a blade diameter narrower than the blade diameter of the conventional flat taper blade is used. Can do. Therefore, it is possible to effectively reduce the motor output (power) while maintaining the stirring effect of the conventional flat paddle blade e.
  • the upflow is generated at the center of the bottom of the tank using the stationary blade 8, so that the base portion of the blade plate 6 composed of flat tapered blades has a large area.
  • the liquid to be stirred can be discharged more effectively in the radial direction.
  • the case where stirring is performed using both the stationary blade 8 and the flat tapered blade is performed under the same conditions in the radial direction.
  • the discharge amount can be increased and the flow velocity at the bottom of the layer can be increased. Therefore, when comparing the case where only the flat taper blade is used with the case where both the stationary blade 8 and the flat taper blade are used under the condition that the flow velocity at the bottom of the layer is the same, the flat taper blade is Since the blade diameter can be reduced, the power can be reduced more effectively due to the effect of reducing the blade diameter.
  • a wing body having a small blade diameter while maintaining the same level of agitation performance as that of a conventional flat paddle blade agitation device, so that the power can be lower than in the past.
  • FIG. 4 to FIG. 6 an example of a conventional flat paddle blade and an example of a flat taper blade of the present invention will be described in comparison.
  • the flow rate at the bottom of the stirring tank is important, the flow rate is low power,
  • the flow velocity at which deposits do not accumulate at the bottom of the agitation tank is the optimum flow velocity (fluidization reference velocity). Such a flow velocity is approximately proportional to the area of the wing.
  • FIG. 1 An example of an optimal conventional flat paddle blade is shown in FIG. 1
  • the flat paddle blade is flat paddle when the stirring tank diameter D is 12 m, the distance h from the water surface to the flat paddle blade is 1.5 m, the stationary blade diameter is 3.4 m, and the blade width is 0.8 m.
  • the blade diameter d of the blade is 4.2 m and the blade width b is 1.1 m. Note that the tip peripheral speed of the blade necessary to obtain a speed of 10 cm / s or more which is the fluidization reference speed at the bottom of the tank was Vyip ⁇ 1.05 m / s.
  • FIG. 1 An example of the flat taper wing of the present invention is shown in FIG.
  • the flat tapered blade has a blade diameter when the stirring tank diameter D is 12 m, the distance h from the water surface to the flat paddle blade is 1.1 m, the stationary blade diameter is 3.4 m, and the blade width is 0.8 m.
  • the tip peripheral speed of the blade necessary to obtain a speed of 10 cm / s or more as the fluidization reference speed at the bottom of the tank was Vyip ⁇ 1.10 m / s.
  • FIG. 6 shows the power number (Np) of the conventional flat paddle blade and the power number of the flat taper blade of the present invention when the Reynolds number (Re) is changed in the flat digester.
  • required by experiment is shown.
  • the power number (Np) of the blade diameter (4.0 m) of the flat tapered blade of the present invention is lower than the blade diameter (4.2 m) of the conventional flat paddle blade.
  • the flat taper blade of the present invention has the same fluidization reference speed at the bottom of the tank, although the blade diameter, blade area, and blade weight are smaller than those of the conventional flat paddle blade.
  • the flat taper blade can reduce the power number and the tip peripheral speed can be increased, but the blade diameter can be reduced as compared with the flat paddle blade. Therefore, the power number (Np)
  • the motor output (P) represented by ⁇ rotational speed (N) 3 ⁇ blade diameter (d) 5 can be reduced. Accordingly, it can be said that the flat taper blade is superior in both the initial cost of the product and the running cost of the power consumption.
  • the horizontal diameter of the blade body 6 of the flat taper blade of the present invention is 6 m, compared to a blade body having a horizontal diameter of a conventional flat paddle blade e of, for example, 9 m, substantially the same stirring performance is exhibited. Can do.
  • the diameter of the opening 3 of the agitation tank 2 can be designed to be smaller than the conventional one. Further, a stirring tank 2 having a small opening 3 can be used. Further, the rotary blade 5 can be easily taken out from the opening 3 of the stirring tank 2.
  • the motor 7 is provided with a rotation control device 9 having an inverter device, a variable transmission device, and the like, and the rotation control device 9 periodically changes the rotation speed of the rotor blade 5. Or rotating the rotor blades forward and backward.
  • the first desired amount is such that deposits such as slurry are generated on the tank bottom 2 b in a range that does not affect the digestibility during normal times.
  • the rotary blade 5 is rotated at a stirring rotational speed for a first desired time. Then, after the first desired time has elapsed, the rotary blade 5 is rotated at a second stirring rotational speed that is higher than the first stirring rotational speed by a second desired time, The accumulated deposits are raised and the tank is made uniform.
  • the stirring blade 5 is rotated at the first stirring rotational speed at the normal time only for the first desired time, and the After the first desired time has elapsed, the rotary blade 5 is rotated at the second desired stirring rotational speed only for the second desired time, and the sediment accumulated in the tank bottom 2b is raised, The inside of the tank is made uniform, and this is repeated as necessary.
  • the operation time in the first desired time in the normal time is lengthened, the low speed operation in which the operation time is long, and the operation time in the second desired time is shortened, and the speed-up operation in which the operation time is short.
  • the average power can be reduced below the conventional level.
  • the rotation control device 9 may periodically rotate the stirring blade 5 in the reverse direction.
  • the pivotal support point in which the base portion of each blade 6 of the rotary blade 5 in the first embodiment is provided on the boss portion 5b of the rotary shaft 5a.
  • the blades 6 are connected so as to be tiltable in the vertical direction (around the axis extending in the radial direction) via 10 and the material of each blade 6 is made to have a specific gravity smaller than the specific gravity of the liquid to be treated.
  • a tilt prevention unit 11 is provided to prevent the blade plate 6 from tilting more than a desired tilt angle.
  • the rotor blades 5 when the rotor blades 5 are not inserted into the liquid to be treated, the rotor blades 5 are moved downward by gravity as shown in FIG. It hangs down and becomes a folded state.
  • the blades 6 are tilted to a desired inclination angle when the rotary blades 5 are rotated, for example, when the blades are opened horizontally, the upper ends of the blades 6 are moved to the tilt prevention unit 11. And the tilting of the blades 6 is prevented, and the blades 6 can be opened at a desired tilt angle when the blades 6 are rotated.
  • a restricting means for restricting the rotational direction of the blade plate 6 as necessary. May be provided. *
  • the inside of the stirring tank 2 can be stirred by rotating the rotary blade 5.
  • the rotating blade 5 is folded even when the blade diameter of the rotating blade 5 during rotation is larger than the opening diameter of the opening 3 of the stirring tank 2.
  • the rotor blade 5 can be inserted into the tank.
  • the blade plate 6 is opened at a desired inclination angle by the centrifugal force. Also good.
  • a weight (not shown) may be provided on each blade 6 so that the blade 6 can be easily opened by the centrifugal force generated by the rotation of the rotary blade 5.
  • the second embodiment can be applied to a conventional flat paddle blade.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Accessories For Mixers (AREA)

Abstract

Le problème décrit par la présente invention est de fournir un appareil d'agitation qui exige moins de puissance et qui peut remuer extrêmement uniformément l'intérieur d'une cuve d'agitation. La solution selon la présente invention porte sur une cuve d'agitation (2), une pale de rotor (5) prévue dans la cuve d'agitation (2), et des pales de stator (8) qui sont prévues au niveau de la partie inférieure de la cuve d'agitation (2) et qui s'étendent radialement, et est caractérisée par le fait que la pale de rotor (5) comprend une ou plusieurs pales effilées plates (6).
PCT/JP2016/060501 2015-07-10 2016-03-30 Appareil d'agitation et procédé d'agitation WO2017010131A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015138449A JP6650221B2 (ja) 2015-07-10 2015-07-10 撹拌装置
JP2015-138449 2015-07-10

Publications (1)

Publication Number Publication Date
WO2017010131A1 true WO2017010131A1 (fr) 2017-01-19

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PCT/JP2016/060501 WO2017010131A1 (fr) 2015-07-10 2016-03-30 Appareil d'agitation et procédé d'agitation

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WO (1) WO2017010131A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7438654B2 (ja) * 2018-04-20 2024-02-27 株式会社イチネンアクセス 攪拌装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63315196A (ja) * 1987-06-16 1988-12-22 Kajima Corp 嫌気性バイオリアクタ−
JPH05192697A (ja) * 1992-01-21 1993-08-03 Toshiba Corp 汚泥消化制御装置
JPH0760093A (ja) * 1993-08-31 1995-03-07 Satake Kagaku Kikai Kogyo Kk 撹拌装置
JP2000015075A (ja) * 1998-07-03 2000-01-18 Satake Chemical Equipment Mfg Ltd 撹拌翼及びその撹拌装置
JP2007061693A (ja) * 2005-08-30 2007-03-15 Kazunori Denki Kogyo Kk 塗料コンテナ用攪拌機
JP2011016087A (ja) * 2009-07-09 2011-01-27 Kobelco Eco-Solutions Co Ltd 撹拌槽、及びそれを備える撹拌装置
JP2013248565A (ja) * 2012-05-31 2013-12-12 Swing Corp 汚泥凝集装置及び汚泥調質方法
JP2015062461A (ja) * 2013-09-24 2015-04-09 義弘 益田 泡立て容器

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63315196A (ja) * 1987-06-16 1988-12-22 Kajima Corp 嫌気性バイオリアクタ−
JPH05192697A (ja) * 1992-01-21 1993-08-03 Toshiba Corp 汚泥消化制御装置
JPH0760093A (ja) * 1993-08-31 1995-03-07 Satake Kagaku Kikai Kogyo Kk 撹拌装置
JP2000015075A (ja) * 1998-07-03 2000-01-18 Satake Chemical Equipment Mfg Ltd 撹拌翼及びその撹拌装置
JP2007061693A (ja) * 2005-08-30 2007-03-15 Kazunori Denki Kogyo Kk 塗料コンテナ用攪拌機
JP2011016087A (ja) * 2009-07-09 2011-01-27 Kobelco Eco-Solutions Co Ltd 撹拌槽、及びそれを備える撹拌装置
JP2013248565A (ja) * 2012-05-31 2013-12-12 Swing Corp 汚泥凝集装置及び汚泥調質方法
JP2015062461A (ja) * 2013-09-24 2015-04-09 義弘 益田 泡立て容器

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JP2017018883A (ja) 2017-01-26
JP6650221B2 (ja) 2020-02-19

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