EP1286777B1 - Presse a rouleaux - Google Patents

Presse a rouleaux Download PDF

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Publication number
EP1286777B1
EP1286777B1 EP01900220A EP01900220A EP1286777B1 EP 1286777 B1 EP1286777 B1 EP 1286777B1 EP 01900220 A EP01900220 A EP 01900220A EP 01900220 A EP01900220 A EP 01900220A EP 1286777 B1 EP1286777 B1 EP 1286777B1
Authority
EP
European Patent Office
Prior art keywords
roller
press
roller press
rollers
bed thickness
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.)
Revoked
Application number
EP01900220A
Other languages
German (de)
English (en)
Other versions
EP1286777A1 (fr
Inventor
Lars Jensen
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.)
FLSmidth and Co AS
Original Assignee
FLSmidth and Co AS
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
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Application filed by FLSmidth and Co AS filed Critical FLSmidth and Co AS
Publication of EP1286777A1 publication Critical patent/EP1286777A1/fr
Application granted granted Critical
Publication of EP1286777B1 publication Critical patent/EP1286777B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/42—Driving mechanisms; Roller speed control

Definitions

  • the present invention relates to a roller press comprising two oppositely rotating rollers which are driven by means of a drive system.
  • Roller presses are known i.a. from international patent application No. WO 92/00141 on from the European patent application EP 0 084 383 A2 .
  • roller presses may entail operational problems manifested by torsional vibrations of the rollers. This may result in substantial torque variations in the drive system and, as a consequence hereof, overloading of the gear unit or cut-out of the safety coupling or main motor.
  • this tendency seems to increase with an increase in the roller peripheral velocity, and, therefore, it is often a limiting factor for the roller peripheral velocity with which a roller press can be operated.
  • a frequently attempted method for enhancing the capacity of a roller press installation relates to enhancements of the roller pheripheral velocity. For previously known roller presses this seems achievable only up to a roller peripheral speed of about 1.5 m/s.
  • roller press it will thus be possible to design the roller press so that it can be driven at roller peripheral velocities in excess of 1.5 m/s. This is due to the fact that the roller press is designed with the lowest natural frequency, which for a given roller diameter and a given roller velocity exceeds the excitation frequency calculated on the basis of the above formula.
  • the roller press according to the invention can thus be utilized in connection with methods for grinding of particulate material, such as cement raw materials, cement clinker and similar materials, where the roller peripheral velocity is greater than 1.5 m/s. According to the invention it is preferred that the roller peripheral velocity is greater than 5 m/s, preferably greater than 8 m/s. It is also preferred that the particulate material be subjected to a pressure of more than 50 MPa by subjecting the material once to pressing action between the rollers of the roller press.
  • roller press comprising two rollers 1 and 2.
  • Particulate material which is to be ground in the roller press is directed from the top via a not shown shaft into the gap between the rollers.
  • the material being fed to the roller press behaves more or less like a liquid as it is drawn into the gap between the rollers by the roller surfaces. At a nip point the material is subjected to compaction until it behaves as a solid.
  • the angle ⁇ between the roller surfaces at the nip point on each roller is termed the nip angle, and the angle ⁇ measured between the horizontal plane through the roller axis and the nip point is termed the nip angle.
  • the quantity of material which passes through the rollers is the product of the grinding bed thickness H , roller width W , the roller peripheral velocity V and the density of the pressed material ⁇ out .
  • the density increases as the material is subjected to pressing action and compaction between the two rollers.
  • the ratio F between the density of the pressed material ⁇ out and the bulk density of the feed ⁇ in constitutes the compaction ratio.
  • F ⁇ out ⁇ in
  • the tendency towards torsional vibrations in the roller shafts occurs in case of uneven feeding to the press, choke feeding of the roller press or feeding of overly fine material to the roller.
  • the grinding bed thickness is determined primarily by the feed characteristics, the feed rate and, in part, by the roller surfaces. If the particle distribution and the composition of material being fed to the press is constant and if the feed rate is constant, the grinding bed thickness will be constant. In connection with roller press grinding it will be possible to measure the maximum grinding bed thickness for a given type of feed. This constant maximum grinding bed thickness is achievable only in case of extremely low roller velocity ( ⁇ 0.05 m/s) and optimization of shaft feeding.
  • Excitation of the roller occurs in connection with deviations from steady-state operation.
  • the grinding bed thickness is less than the maximum grinding bed thickness.
  • the greater the sudden deviation from the maximum grinding bed thickness the greater the excitation intensity of the system.
  • the system can be made to oscillate at its natural torsional frequency.
  • the excitation mechanism relates to the time it takes the material to pass through the compaction zone between the rollers, i.e. the angle of engagement ⁇ , the length L of the nip zone and the roller peripheral velocity.
  • the frequency F is 1/T.
  • the excitation frequency is the frequency achieved when the grinding bed thickness H is increased to a maximum
  • the above-mentioned equation can be used to estimate the excitation frequency for a given roller diameter at a given roller velocity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Claims (4)

  1. Presse à rouleaux comprenant deux rouleaux (1, 2) tournant dans des sens opposés et qui est entraînée au moyen d'un système d'entraînement, caractérisée en ce que le système d'entraînement est conçu de telle sorte que sa plus basse fréquence de torsion naturelle vsystem dépasse une fréquence calculée exprimée par la formule : ν system > V D • 1 H D • 2 ρ out ρ in - 1
    Figure imgb0012
    dans laquelle
    V est la vitesse du rouleau
    D est le diamètre du rouleau
    H est l'épaisseur du lit de broyage
    ρout est la densité des galettes pressées
    ρin est la masse volumique de la charge introduite dans la presse à rouleaux.
  2. Procédé pour broyer des matériaux particulaires tels que des matériaux crus à ciment, des clinkers de ciment et matériaux similaires dans une presse à rouleaux selon la revendication 1, caractérisé en ce que la vitesse périphérique du rouleau est supérieure à 1,5 m/s.
  3. Procédé selon la revendication 2, caractérisé en ce que la vitesse périphérique du rouleau est supérieure à 5 m/s, de préférence supérieure à 8 m/s.
  4. Procédé selon la revendication 2 ou 3, caractérisé en ce que le matériau particulaire est soumis à une pression de plus de 50 MPa lorsqu'il est soumis à une action de pressage entre les rouleaux de la presse à rouleaux.
EP01900220A 2000-04-17 2001-01-19 Presse a rouleaux Revoked EP1286777B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK200000646 2000-04-17
DK200000646A DK173915B1 (da) 2000-04-17 2000-04-17 Valsepresse og fremgangsmåde til formaling af partikelformet materiale
PCT/IB2001/000058 WO2001078898A1 (fr) 2000-04-17 2001-01-19 Presse a rouleaux

Publications (2)

Publication Number Publication Date
EP1286777A1 EP1286777A1 (fr) 2003-03-05
EP1286777B1 true EP1286777B1 (fr) 2008-06-25

Family

ID=8159438

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01900220A Revoked EP1286777B1 (fr) 2000-04-17 2001-01-19 Presse a rouleaux

Country Status (6)

Country Link
EP (1) EP1286777B1 (fr)
AU (1) AU2001223916A1 (fr)
DE (1) DE60134548D1 (fr)
DK (1) DK173915B1 (fr)
ES (1) ES2309046T3 (fr)
WO (1) WO2001078898A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7122155B2 (en) 2002-07-16 2006-10-17 Mcgill University Electron microscopy cell fraction sample preparation robot

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3302176A1 (de) * 1983-01-24 1984-07-26 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren und anlage zur kontinuierlichen druckzerkleinerung sproeden mahlgutes

Also Published As

Publication number Publication date
DE60134548D1 (de) 2008-08-07
AU2001223916A1 (en) 2001-10-30
DK200000646A (da) 2001-10-18
DK173915B1 (da) 2002-02-18
WO2001078898A1 (fr) 2001-10-25
ES2309046T3 (es) 2008-12-16
EP1286777A1 (fr) 2003-03-05

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