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FEATURE

Hammer pattern

Hammer patterns (the number and distribution of the hammers on the rotor) and positions (setting the hammer closer to or further from the screen) have a profound effect on the performance of any hammermill. Because different materials grind differently, the ideal number of hammers and clearance to the screen will need to be adjusted according to each application. For course grinding it is most efficient to grind with a limited number of hammers, but for fine grinding aquaculture applications it is best to use an extra heavy hammer pattern to achieve the very fine finished products desired. If the rotor is equipped with a larger amount of pins (12), the total number of hammers is increased significantly. This without putting an excessive number of hammers on (four or eight) pins, which could lead to high stress and the possible failure of the rotor plates. For optimal hammer life and most efficient operation, a hammer with a flared hard face end is preferred. Single hole hammers are grind can be achieved at a certain screen hole size compared to generally preferred to maintain balance of the rotor and minimise lower tip speeds (smaller diameter hammermills). It is not hard the potential for catastrophic hammer failure. to imagine the benefits of grinding with larger diameter holes It is important to realize that energy consumption of the mill towards energy consumption and screen wear (operational costs). increases drastically when the hammers are reaching the end of their serviceable life. The use of long-lasting tungsten carbide Screen area (relation capacity & motor power) hard-faced hammers not only save on labor costs but also are The whole idea of efficient fine grinding is that the particle more energy efficient. size reduction is done by the impact of the hammers. With a lture | 2018-19 | Theme: Instant Algae | Design: | Version: 2-print On top ofAthe before mentioned subjects other fine grinding largerHatchery screen areaAd the Campaign product escapes more effectively from enhancers are proper screen sealing and backing screens for the grinding chamber. Smaller screen surfaces keep the product ernational Aqua Feed | Size: Half Page | Dimensions: 190mm x 132mm (7.48” x 5.20”) protection of the thin small hole grinding screens. longer in the grinding chamber causing increased energy Following the above guide line might help you making the right consumption (heat) and wear. A typical design range is 120cm²/ decisions when analyzing an existing grinding system or setting kW total screen surface or an “open hole area” of >34 cm²/KW up a new one. installed motor power.

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International Aquafeed - December 2018 | 27

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DEC 2018 - International Aquafeed magazine  

DEC 2018 - International Aquafeed magazine