×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

do you know Rotory Drum dryers for aggregates?

do you know Rotory Drum dryers for aggregates?

do you know Rotory Drum dryers for aggregates?

(OP)
if you know something on this subject let me know your handle i have some questions on how to improve the productivity of ours.

RE: do you know Rotory Drum dryers for aggregates?

what is the size of the aggregate, composition of the aggregate, application of the aggregate and the fuel source for the rotary drier.

RE: do you know Rotory Drum dryers for aggregates?

(OP)
we are drying pea gravel, and also fine sand, for use as concrete aggregate and mason agg.  the dryer is 5' dia 29' long. with an 8 million BTU Gas burner, dust collection fan is moving 14,000 CFM

RE: do you know Rotory Drum dryers for aggregates?

any internal details?

RE: do you know Rotory Drum dryers for aggregates?

Biekindy,

Without having to go into a detailed investigation, I can tell you some basics about your dryer capacity:

1) Calculate the sensible heat required to warm the air to 212F from the follwoing equation: q=1.08 CFM (212-Ti).

2) The most water you can evaporate from the air is:
M=q/dH = 8,000,000 Btu /970 Btu/lbs = 8,247 lbs. (This is an approximation because you need to subtract the heat required from 1).

3) The actual values will change based on your before and after gravel moisture content and the incoming air properties.

Good luck.  

RE: do you know Rotory Drum dryers for aggregates?

Is your aggregate and sand produced at a rock crushing plant that you operate? and what is the utimate use for your products?
I was involved at CS&S in Ct. for 10 years and the aggregate did not require drying.  As a matter of fact, we wetted the aggregate most of the years for our cement batch mixing plants.  Drying was never considered but looking at the above equations from Dracula they appear correct as well as his statement concerning state of wettness.
What you want to do is perform a mass balance and a heat transfer analysis of moisture and of the aggregate and estimate the time element of the drying process and compare with the actual values; of course do not discount the enviromental factors affecting the plant performance.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources