VRM

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  • ok good morning!! friends
    damring hieght is directly impacting grinding bed of material. its increases mill load. if margine is there may increases and get advantage of production increase.low hiegth and some times looses of energy and creates high vibrations.so adjust according to load and conditions of rollers liners.
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  • Dear sir.
    can you answer me about damring gap impact of VRM? if I increase or decrease this damring gap, what happen?
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VRM

  1. 1. VRM mkpasha_sitelcl@hotmail.com
  2. 2. 1. Separation → 2. Grinding → 3. Drive → Separation Feed Material Grinding Drive Raw meal Exhaust gases Transport Drying gases Energy Hot 8/7/2013
  3. 3. feed gate (air lock) mill casing water injection dam ring louvre ring nozzle of material scraper mill outlet duct speed reducer with table bearingand motor clutch grinding table hot gas inlet hydraulic cylinder table liner roller with tyre or segments roller axle rocker arm discharge flap separator tailings cone separator guide vanes cage rotor separator product discharge mill exhaust 8/7/2013
  4. 4. Vertical roller mill Feed size: f (Roller Ø ) Material bed Feed material Max Particle size in feed: 5-8 % of roller diameter Grinding force = Roller weight + (pressure) Force Table moves with drive Roller rolls freely with table 8/7/2013
  5. 5. Gas & Product Material Feed Material Separator Rejects Internal Circulation Large Material falls through to scraper Internal gas flow Material & Gas Material Gas Separator: removes fine material rejects coarse material 8/7/2013
  6. 6. G.Pfeiffer Loesche FLS Atox Polysius 8/7/2013
  7. 7. static separator conventional rotor type cage rotor type with guide vanes F T P F F FT T P F F T P T F P F = P = T = Tailings Product Feed F T Cage Rotor typeConventional Rotor type Static type Separation control: 1. Vane adjustment 2. Speed control 8/7/2013
  8. 8. Angle affects product sizing Rotor speed affects product fineness Rotor seal affects separator efficiency 8/7/2013
  9. 9. Used for reducing gas flow pressure lost over the mill (less pneumatic internal circulation) collecting conveyor fresh feed louvre ring scraper bucket elevator 8/7/2013
  10. 10. Control  Gearbox - Vibration monitor - Temperature monitor  Gas flow - Temperatures & pressures  Hydraulics - Pressures Maintenance  Wear - Rollers & Table - Separator (sealing!) & Housing  Lubrication & Hydraulics (filters and seals) 8/7/2013
  11. 11. Control points 1 gas flow 2 pressure difference 3 return gas flow pressure 4 outlet temperature 5 external recirculation 8/7/2013
  12. 12. Rotary valve Pendulum valve Weigh belt Metal extraction Reduces false air entering with feed material. Good for dry, small size material. Reduces false air entering. Better for lumpy or humid feed material. Weighs the passing material ensuring a continuous grinding bed in the mill Metal objects damage the roller & table. The magnet removes them 8/7/2013

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