3 replies to this topic

[kate1989]

i want to design a spray drying system to get 10 ton/hr dried material from 110 ton/hr slurry with11% solid content but i unfortunately i dont have any experience on drying operations. so far i have calculated heat transfer coefficient from the droplet (dia of the droplet i have assumed) ( h_cD/K_d) = 2 + 0.6(D*v*ρ/μ )
and then rate of evaporation of water from the droplet. M = h_c*A*(∆T)/λ. now to get the residence time
should I use M_w/M but i have a doubt this mass (of droplet) also has suspended solids.Also volume of the dryer depends on the residence time so i am stuck to get a perfect design. I would be grateful to you if you
guide me to such design.
Also cost of the dryer depends on size(volume) or just capacity of drying ?
and if I use other means of drying (drum or tunnel ) which of them is economical ?

[Absolute Zero]

Dear,

I advise you to please refer to Spray Drying Handbook by Keith Masters. As it contains all the calculations related to spray dryer design and also would guide you in selecting the economical spray dryer.

Regards

[kate1989]

thanks for your response.......i tried to look for the book but didnt find it so far. i just need the flow of material and air and temp and also the size of the dryer. its like a black box model n not really need a detailed design though

[Absolute Zero]

The attached file will help you, this file I used when I was working on Unilever's Detergent Spray drying project

Attached Files

•  Tower HMB.xls   543KB   449 downloads