- #31
wermix
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this style isn't necessary but i don't have about any other style :)russ_watters said:
Calculating Power Requirements for Blending Granular Materials in a Machine
- Thread starter wermix
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Discussion Overview
The discussion revolves around calculating the power requirements for a machine designed to blend granular materials, specifically electronic waste. Participants explore various aspects of the machine's design, material properties, and blending techniques.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
- Conceptual clarification
Main Points Raised
- One participant seeks assistance in calculating the engine power needed for blending electronic waste, specifying a capacity of 600-700 dm3 and a density of approximately 500 kg/m3.
- Another participant questions the nature of the machine, suggesting it resembles a shredder rather than a blender, prompting clarification that it is intended to homogenize the material.
- Concerns are raised about the potential damage to electronic components during blending and the release of harmful chemicals from certain materials.
- Participants discuss the need for a gentle mixing method, suggesting alternatives like a cement mixer instead of a paddle-based blender.
- Clarifications are made regarding the size and type of materials being blended, with one participant stating that the components are crushed to about 50 mm in size.
- There is a mention of the "Brazil nut" effect, suggesting that the blending process may lead to segregation rather than homogenization.
- Some participants express uncertainty about the appropriateness of the paddle blender for the intended purpose, with suggestions for alternative methods being discussed.
- One participant emphasizes the importance of ensuring that every part has an equal chance of being included in the sample for laboratory analysis.
- There is a discussion about the difficulty of calculating power requirements, with some participants suggesting that existing equipment designs should be utilized instead of attempting to calculate from first principles.
Areas of Agreement / Disagreement
Participants do not reach a consensus on the best method for blending the materials or the appropriate power calculations. Multiple competing views on the machine design and blending techniques remain present throughout the discussion.
Contextual Notes
Participants express limitations in the description of the application, which complicates the ability to provide accurate suggestions. There are unresolved questions regarding the specific requirements for blending and the characteristics of the materials involved.
- #32
Asymptotic
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Then a paddle blender is perhaps not a good choice.wermix said:
- #33
wermix
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any better idea ?Asymptotic said:
- #34
Asymptotic
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I'd go with @russ_watters cement mixer and see how that works out.wermix said:any better idea ?
Edit: That is, @berkeman 's
- #35
wermix
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so no idea how to calculate it :D
- #36
russ_watters
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Such things don't get calculated by users or even plant engineers because equipment manufactuers have been refining the designs of appropriate equipment for many years (in this case, millenia). What you do is select an already existing product to use. Here's one that fits your requirements:wermix said:
http://www.performancetoolcenter.co...Bt94ay_u3c2W_uoBwkAoFOIu3o2XkZCEaAjeaEALw_wcB
The volume is almost exactly what you asked for. Note, the density of your stuff is much smaller, so the 8hp/6kW motor is more than you need.
- #37
Asymptotic
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If I needed to find out how much power was necessary, my approach would be to place a weighed sample of the trash in the existing coal ash blender, and measure power usage. Provided both the existing and (proposed, larger) blenders operate at the same paddle speed, power may scale reasonably well with mass. Keep in mind to add a safety factor for the increase in surface area, and accompanying increase in frictional losses.wermix said:
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