Re: Cement Dust Qty Estimation
There are some rules of thumbs, which elude me at the moment.
I have reservations with “rules of thumbs”.
Will post tomorrow, if you are interested.
Regards,
Lyle ■
Re: Cement Dust Qty Estimation
Dear Lyle,
It would be great if could revert with your advise.
Regds
Prabuddha ■
Cement Dust
There are norms.
How are you loading cement into silos - By pnumatic conveyors or mechancal conveyors?
How are you feeding cement into ribbon mixer hopper - by dumping from road vehicle or by a conveyor? ■
Re: Cement Dust Qty Estimation
Dear vinayak,
In silos, cement would be pneumatically charged (dense phase system)
In ribbon blender, it is manually done i.e. unloading 50 kg bags onto the ribbon blender hopper.
Regds
Prabuddha ■
Cement Dust
For Silo installations:
dust air content in exhaust air: 5 to 15 gm/m3
vent air volume - +200 - 400% of coneying air volume
* Cement Engineers' Handbook - Originated by Otto Labahn Fourth English Edition published by Bauverlag GMBH 1983
ISBN 3-7625-0975-1
I have no comment on manual unloading of 50 kg bags in Ribbon blender. ■
Re: Cement Dust Qty Estimation
Thanx Vinayak, just to clarify further doubts
1. By m3 in 5-15gms/m3 ,I assume you are referring to m3 of silos?
2. If, I were charge cement into ribbon blender through a mechanical conveyor,would 5-15 gms/m3 still apply? where m3 is the vol of ribbon blender.
Regds
Prabuddha ■
Re: Cement Dust Qty Estimation
The empirical rules I have wouldn’t be suitable for this application.
Consider the reference I cited here:
https://forum.bulk-online.com/showth...4668#post34668
Regards,
Lyle ■
Re: Cement Dust Qty Estimation
If you are looking to use this information for filter sizing, I would suggest that you consider the problem in another way and rather than look at dust quantities, look at gas quantities.
If you are pneumatically conveying into a closed vessel such as a silo, you need to design the exhaust filter for the required gas flow. This may or may not be the normal conveying gas flow rate. If you are using a pressure vessel conveying system, there may be a large increase in gas flow when the vessel empties, if it a rotary valve based conveying system, the variation in gas flow may be negiligible.
For bag emptying applications, you should look at the gas velocity required into the opening on the hopper to prevent fugitive dust emissions and size the filter on this basis.
Filter manufacturers will be happy to size on this basis and won't expect you to tell them how much dust is reaching the filter element.
However if you are trying to estimate the amount of dust which will go down a vent line to a remote filter or something like this to see how often you will need to empty the filter for example, that is much more difficult. The size of the receiving hopper, how full it is, the position of the vent outlet, etc. will all have a significant effect on the answer. You could easily see an order of magnitude difference depending upon the details of the installation. ■
Cement dust qty estimation
Friends,
As a service professional who has just shifted from the liquid manufacturing industry to solids handling industry, I seek your help for the following
How does one estimate the dust generated while charging a) cement ,b) sand into Ribbon blender & silos. A thumbrule answer would be beneficial.
Regds
PNN ■