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Olivier Rousseaux STOLZ ASIA SALES MANAGER

VICTAM – Utrecht – May 2007. Olivier Rousseaux STOLZ ASIA SALES MANAGER. PARAMETERS AFFECTING THE FINE GRINDING OF AQUAFEEDS USING A HAMMERMILL. VICTAM – Utrecht – May 2007. PARAMETERS AFFECTING FINE GRINDING CONTENT. INTRODUCTION A] Raw Materials

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Olivier Rousseaux STOLZ ASIA SALES MANAGER

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  1. VICTAM – Utrecht – May 2007 Olivier RousseauxSTOLZASIA SALES MANAGER PARAMETERS AFFECTING THE FINE GRINDING OF AQUAFEEDS USING A HAMMERMILL

  2. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING CONTENT INTRODUCTION A] Raw Materials B] Main Mechanical parameters we can change for better result C] Global solution CONCLUSION

  3. VICTAM – Utrecht – May 2007 INTRODUCTION: GRINDING COST: HAMERMILL VS. PULVERIZER • Pulverizer : • Needs a lot of aspiration • High aspiration means high moisture losses • High power consumption • Hammermill : • Need aspiration • Reasonable power consumption • Reasonable Moisture losses • Cost : • Electrical cost: easy to evaluate • Wearing parts cost: easy to evaluate • Moisture losses: difficult to evaluate

  4. VICTAM – Utrecht – May 2007 GRINDING COST: HAMERMILL VS. PULVERIZER HUGE SAVING

  5. VICTAM – Utrecht – May 2007 INTRODUCTION: GRINDING COST: HAMERMILL VS. PULVERIZER In terms of fineness Still pulverizer is better than Hammermill But this has a cost Compromise: Hammermill + Pneumatic System + TurboSifter

  6. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING A1] RAW MATERIALS • Which raw materials: • Corn, Soya, cassava… • Wheat bran, rice bran… • Fish meal, feather meal… • Grinding design • Either pre-grinding or post grinding system • Either 1 or 2 step(s) grinding

  7. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING A2] RAW MATERIALS • Physical aspects • Initial size of the particles •  initial size,  capacity • b) Biological aspects • Moisture content •  Moisture content,  capacity • Fat content •  fat content,  capacity • Hardness •  hardness,  capacity BASICALLY , RAW MATERIALS have to be used as what they are

  8. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING B] Main Mechanical parameters you can change for better result B1] Rotor Speed: 1500 or 3000 RPM • Generally : • 1500 rpm hammermills rotors are of about 1 400 mm diameter • 3000 rpm hammermills rotors are of 650 to 700 mm diameter Disadvantages of a 1500 rpm hammer mill vs. a 3000 rpm : • The size • Screen changing more difficult • Needs more important screen surface • Disadvantages of a 3000 rpm hammer mill vs. a 1500 rpm : • Noise • Fan makes more noise than hammermills, what ever its size

  9. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING B] Main Mechanical parameters you can change for better result B2] Rotor Speed Screen How can the rotor speed affect the granulometry? Speed variation of the rotor, using an inverter Table giving medium size of particles in function of Screen size and rotor speed. The mathematical model was made by TECALIMAN French Technical Centre. Speed  ROTOR SPEED,  PARTICLES SIZE

  10. A: no steel heat treatment or bad treatment • B: correct steel heat treatment + C Addition • 1: new beater • 2: one side worn • 3: both sides worn • A: no steel heat treatment or bad treatment • concave wearing • B: correct steel heat treatment : • convex wearing • A: no steel heat treatment or bad treatment • Round shape wear • B: correct steel heat treatment : • Spoon shape wear VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING B] Main Mechanical parameters you can change for better result B3] Beaters : Steel treatment and Wearing How can you control the best quality?

  11. Counters beaters VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING B] Main Mechanical parameters you can change for better result B4] Counters Beaters Counters beaters increase Flow rate and fineness

  12. D EA VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING B] Main Mechanical parameters you can change for better result B5] Screen : Dimensions and design • Useful Screen Size ,  capacity • Screen perforation, Particles size • Screen Opening (%) ,  capacity • Screen Thickness ,  Particles size Opening% = D² * 0.907 / EA²

  13. New screen WORN: while rebounding, the grain is taken again by the hammers Worn screen Product rebounding Product NEW: while rebounding, the grain is returned outside rebounding Screen wearing effect VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING B] Main Mechanical parameters you can change for better result B6] Screen: Wearing Lifetime of the screen depends also of the cleanliness of the raw materials

  14. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING B] Main Mechanical parameters you can change for better result B7] Air Flow • Air flow is made 2 main parameters: • Air flow : m3/h, … • Pressure: WC, bar • For Coarse Grinding (Screens 2 mm and more): • Air Flow of about 8500 m3/h for 1 m² • Air Pressure is of about 300 to 500 mm water column on the screen • For Fine Grinding (screen 1.5 mm and less): • Air Flow of about 5500 m3/h for 1 m² • Air Pressure of about 700 to 1000 mm water column on the screen

  15. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING B] Main Mechanical parameters you can change for better result B8] Air Flow through hammermill and air jet filter • AIR SPEED : • Air speeds: • 22-23 m/s through the destoner • 4-6 m/s through the grid • 2.5 to 3 m/s through the filtering media • AIR FLOW ACTIONS: • Generally little effect on the particle size • Depending of the hammermill feeder design: Better heavy materials removal. • Will help reducing the T° increase of the ground product, avoiding down stream condensation • Enables product passing through the screen AIR FLOW REGULATION : • Allows a constant flow rate, whatever may be the pressure loss • From where, a better de stoning • Avoids any overload of the filtering media • Allows a progressive air flow increase, avoiding inopportunely emptying of the stone box

  16. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING B] Main Mechanical parameters you can change for better result B9] GRINLING LINE DESIGN a) Mechanical handling b) Pneumatical handling

  17. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING C] GLOBAL SOLUTION C1] HAMMERMILL • Feeder • Hammermill

  18. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING C] GLOBAL SOLUTION C2] HAMMERMILL: Feeder + Grinder • The Feeder • Dimension same as the grinding room • Pneumatic Magnet • Heavy particle remover  Unique  Very advanced System • The Grinder • Liner • Screen • Beaters • Counters beaters • But also for safety reasons • Temperature control • Auto greasing • Screen sliding

  19. Magnet Air Inlet with adjustable flaps Feeder with global regulation Pocket feeder with frequency inverter Automated Air flow adjustment Heavy particle remover Stainless steel Stone Sand Any high density particle VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING C] GLOBAL SOLUTION C3] Feeder : Very unique

  20. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING C] GLOBAL SOLUTION C4] How works the feeder Raw materials Feeder Air flap Air inlet Magnet Air Heavy particles separator Material to be ground

  21. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING C] GLOBAL SOLUTION C5] Feeder : Its benefits • Thanks to the design of the feeder: • Removal of any heavy particles ( Stone or not) • Adjustment of the air flow through the feeder • Not the least, the feeding of the hammermill is: • Regular • Continuous • Done homogenously on all the length of the hammermill • All the conditions are gathered for a good grinding:

  22. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING C] GLOBAL SOLUTION C6] Hammermill : Its design • Crushing plate or liner • Rotor made of 8 axes • Beaters • Counters Beaters

  23. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING C] GLOBAL SOLUTION C7] Screen fixations • Locking plate to release or tighten the screen • Air cylinders to pull in or push out the screen • No doors to open to replace a screen safety

  24. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING C] GLOBAL SOLUTION C8] Screen replacement • Step 1: Stop of feeder • Step 2: Unlocking • Step 3: Pushing out • Step 4: Change of screen • Step 5: Pulling in • Step 6: Locking • Step 7: Start of feeder • Time = • Maximum 3 MINUTES SAVE POWER AND TIME

  25. Rotor specially designed High speed Clock rotation Sieving drum rotates Low speed Clock rotation Sequenced rotation Compressed air @ 7bars When sieving drum rotates Sequenced air pulsing Cross contamination less Main features VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING C] GLOBAL SOLUTION C9] Turbosifter

  26. Screw inlet Design of the rotor Paddles arrangement Sieves Small gap between sieves and paddles VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING C] GLOBAL SOLUTION C10] Turbosifter: Rotor

  27. Adjustable Air Pressure VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING C] GLOBAL SOLUTION C11] Compressed air system • Nozzles lines

  28. VICTAM – Utrecht – May 2007 PARAMETERS AFFECTING FINE GRINDING C] GLOBAL SOLUTION C12] Grinding line for shrimps feeds or fish feeds

  29. VICTAM – Utrecht – May 2007 THANK YOU FOR YOUR ATTENTION

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