Dave Dickey Forum Moderator 309 Posts
Re: How do I design my agitation system?14 December 2011 at 1:29pm
This answer is in response to multiple questions, the primary of which follow the answer. The answers to the basic questions are easier than the explanation for the calculations.
1. Type of impeller? PBT - 4-blade, pitched (45 degree) blade turbines.
2. Number of impeller? 2 impellers, one 150 mm off-bottom and the other 300 mm off-bottom.
3. Impeller dimension? Both impellers 275 mm in diameter with 55 mm wide blades
4. Rotational speed? 350 rpm
5. Shaft dimension? Diameter 38 mm by 1040 mm long
6. Power required? Minimum motor power 3.75 KW
7. Material of construction for impeller and its shaft? Carbon Steel
8. Please guide me how I can calculate them. (if possible) Suggested References: Handbook of Industrial Mixing (John Wiley, 2004); The High-Efficiency Road to Liquid-Solid Agitation Chemical Engineering (October 1994, pp. 138-144); How the Design of Shafts, Seals and Impellers Affects Agitator Performance (Chemical Engineering , August 30, 1976, pp. 101-108).
The answers by this expert are based on the best available interpretation of the information provided. The consequences of the application of this information are the responsibility of the user. If clarification is needed, please submit a further question.
How can I design an agitator (pitched-blade turbine) for dissolution solid particles (iron powder in water)? I have to design a mixing tank to mix iron powder 150 microns density = 2450 kg/m3 amount 100kg in the water 200L (batch process). I design the mixing time is around 10 minutes. And tank dimension, elliptical bottom, diameter = 0.75m and height = 0.85 m with 2 baffles. I want to know how many blades for each impeller and how many numbers of impellers are suitable and their dimension? And how can I calculate power number for one or two impellers if two impellers are require? At last, I want to know the speed of the impellers that you recommend.
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