WO2023247183A1 - Centrifugeuse de décantation - Google Patents

Centrifugeuse de décantation Download PDF

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Publication number
WO2023247183A1
WO2023247183A1 PCT/EP2023/065208 EP2023065208W WO2023247183A1 WO 2023247183 A1 WO2023247183 A1 WO 2023247183A1 EP 2023065208 W EP2023065208 W EP 2023065208W WO 2023247183 A1 WO2023247183 A1 WO 2023247183A1
Authority
WO
WIPO (PCT)
Prior art keywords
drum
inlet pipe
decanter centrifuge
centrifuge according
absorber
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2023/065208
Other languages
German (de)
English (en)
Inventor
Prof. Dr. Jürgen HERMELER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP23731268.1A priority Critical patent/EP4493322A1/fr
Publication of WO2023247183A1 publication Critical patent/WO2023247183A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor

Definitions

  • the invention relates to a decanter centrifuge with a rotatable drum that tapers conically towards a solids outlet and forms a liquid outlet at the opposite end, a stationary inlet pipe leading axially into the drum for feeding a suspension into the interior of the drum, and a rotatable in the drum arranged screw, which surrounds an outlet end of the inlet pipe and forms a helix that extends radially to the inner peripheral surface of the drum.
  • the inlet pipe is rigidly held outside the drum and one end projects freely into the interior of the drum.
  • the axial position of the mouth of the inlet pipe is chosen so that the suspension enters the interior of the drum in a technically optimal position. Since the drum rotates, a liquid-tight passage for the inlet pipe must be provided in an end wall of the drum, which allows relative rotation of the two components. Via this implementation, an imbalance in the drum, which is caused, for example, by the mass distribution of the suspension currently present in the drum, can be transferred to the inlet pipe, so that it is stimulated to vibrate. The excitation frequency of these oscillations corresponds to the speed of the drum.
  • the functional principle of a vibration absorber is based on the fact that a balancing mass, the so-called absorber mass, is suspended from a system capable of oscillation in such a way that it is capable of oscillations with the natural frequency of the system. In resonance, the absorber mass then oscillates in push-pull to the main mass of the system, so that the oscillation amplitude of the main mass is reduced. By dampening the oscillation of the absorber mass, oscillation energy can then be removed from the system and the occurrence of resonance oscillations in the main mass can be largely suppressed.
  • the axial position of the vibration absorber can be chosen so that it corresponds to a vibration node of the first harmonic. In this way, a reduction in the natural frequency of the first vibration is avoided.
  • An inlet pipe 42 which is rigidly held outside the drum 10 in a frame (not shown), runs coaxially through the hub 12 and ends inside the cylindrical section 12 of the drum.
  • An outlet end 44 of the inlet pipe 42 is surrounded at a short distance from the radially inner longitudinal edges of the support walls 34.
  • the drum 10 and the screw 20 are driven at slightly different speeds so that the screw 20 runs slightly faster than the drum 10.
  • An emulsion to be decanted is pumped into the interior of the drum 10 via the inlet pipe 42 and radially outwards through an impact body 48 distracted.
  • the emulsion is accelerated in the circumferential direction by the radial support walls 34, so that due to its inertia it spreads into a thin film on the leading surface of each support wall and flows radially outwards due to the centrifugal force.
  • the radial component of the flow velocity of the suspension remains relatively low due to the friction on the support walls 34.
  • the suspension collects to form a liquid ring or “pond”, the inner surface of which is shown in dashed lines in the upper half of FIG. Due to the centrifugal force, the heavier solid phase of the suspension settles on the inner surface of the drum and, due to the differential rotation of the screw and drum, is driven by the helix 32 to the left in FIG. 1, i.e. towards the conical end of the drum. Through the last turn of the helix 32, the solid cake is pressed into the conical section 24 of the screw and then taken over by the helix 30 and transported to the tapered end of the conical section 14 of the drum, where it is discharged via a solids outlet 50 formed by radial discharge openings .
  • the resonance frequency of the oscillatory system formed by the absorber masses 62 and the leaf springs 76 is selected so that it corresponds to the natural frequency of the lowest vibration mode of the inlet pipe 42, and the axial position of the vibration absorber 60 is selected so that the absorber mass 72 is affected by the lowest vibration Supply mode of the inlet pipe 42 can be excited to oscillate.
  • the bending vibrations of the inlet pipe 42 are canceled out by the anti-phase vibrations of the absorber mass 72, so that effective vibration suppression is achieved.
  • the natural frequency of the next higher vibration mode of the inlet pipe 42 which would have a node at the location of the vibration absorber 60, is so high that it is well above the maximum speed of the
  • Drum 10 lies and therefore cannot be excited to resonate vibrations.

Landscapes

  • Centrifugal Separators (AREA)

Abstract

L'invention se rapporte à une centrifugeuse de décantation comprenant un tambour rotatif (10) qui s'effile de manière conique dans une sortie de solides (50) et qui forme une sortie de liquide (56) au niveau de l'extrémité opposée, un tube d'entrée fixe (42) qui conduit de manière axiale dans le tambour pour fournir une suspension à l'intérieur du tambour, et une vis (20) qui est agencée de manière rotative dans le tambour et qui entoure une extrémité de sortie (44) du tube d'entrée et qui forme une hélice (30, 32) qui atteint de manière radiale la surface circonférentielle interne du tambour (10). L'invention est caractérisée en ce qu'une partie du tube d'entrée (42) qui fait saillie de manière axiale à l'intérieur du tambour, présente un amortisseur de vibrations mécaniques (60).
PCT/EP2023/065208 2022-06-24 2023-06-07 Centrifugeuse de décantation Ceased WO2023247183A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23731268.1A EP4493322A1 (fr) 2022-06-24 2023-06-07 Centrifugeuse de décantation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP22180878.5 2022-06-24
EP22180878.5A EP4295957A1 (fr) 2022-06-24 2022-06-24 Centrifugeuse décanteuse

Publications (1)

Publication Number Publication Date
WO2023247183A1 true WO2023247183A1 (fr) 2023-12-28

Family

ID=82308517

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/065208 Ceased WO2023247183A1 (fr) 2022-06-24 2023-06-07 Centrifugeuse de décantation

Country Status (2)

Country Link
EP (2) EP4295957A1 (fr)
WO (1) WO2023247183A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0341433A2 (fr) * 1988-05-11 1989-11-15 Flottweg Gmbh Centrifugeuse à vis à bol plein
CN107282316A (zh) * 2017-04-14 2017-10-24 济南大学 一种应用石墨烯陶瓷结构及减振增稳结构的卧螺离心机
WO2019081177A1 (fr) 2017-10-27 2019-05-02 Hermeler Juergen Décanteur centrifuge
CN110605189A (zh) * 2019-08-30 2019-12-24 浙江工业大学 一种卧螺离心机用多功能混合型进料管

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0341433A2 (fr) * 1988-05-11 1989-11-15 Flottweg Gmbh Centrifugeuse à vis à bol plein
CN107282316A (zh) * 2017-04-14 2017-10-24 济南大学 一种应用石墨烯陶瓷结构及减振增稳结构的卧螺离心机
WO2019081177A1 (fr) 2017-10-27 2019-05-02 Hermeler Juergen Décanteur centrifuge
CN110605189A (zh) * 2019-08-30 2019-12-24 浙江工业大学 一种卧螺离心机用多功能混合型进料管

Also Published As

Publication number Publication date
EP4493322A1 (fr) 2025-01-22
EP4295957A1 (fr) 2023-12-27

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