Re: Coarse Particle Req More Pressrue
dear Rahul,
Thank you, I am fine. Hope, you are doing well to.
Coarser particles require more gas velocity, as they have a higher suspension velocity.
Pressure is built up as a result of the loading ratio.
Reducing the compressed air supply line will not help.
Reducing the convey pipeline diameter will increase the gas velocity and will help.
However, then you are downsizing the installation.
Better would be to increase the compressor volume capacity.
This is easy to test, by using a rental mobile diesel driven air compressor with a pressure reducer (set at 3 bar(o) to safeguard the installation).
Success
Teus ■
Teus
Ash Conveying
I would suggest that you go and visit Dr V K Agarwal at the IIT just south of your offices on the ring road. He has experience of conveying ESP fly ash, coarse fly ash, bed ash and bottom ash. He has extensive pneumatic conveying test facilities in his laboratory at the IIT for his work on ash conveying. Try him at vagarwal@itmmec.iitd.ac.in ■
Reclarification
KA:- Teus Tuinenburg
dear sir
I am very much like to go with your statement. But here the case is of densephase actually, imean our client is getting input air from single compressor which implies the velocity of air would be same for both the particle , acc to you our client should have seperate compressor with different rating for both the particle(ie fine and coarse)
Well my perception says it may not be economical, rather we are having several eg where we are successful to convey both the particle via constant rating of compressor
waiting for your valuable reply
thnx
rahul
Captiva ■
Re: Coarse Particle Req More Pressrue
Dear Rahul,
If the compressor volume is increased until the coarse particles are conveyed satisfactorily,
then the finer particles will also be conveyed satisfactorily with the same compressor.
For the finer particles a lower velocity would work, but a higher velocity will work also.
best regards
teus ■
Teus
Re: Coarse Particle Req More Pressrue
dear mr teus
sir my worry is ,
why our client is not getting coarse particle conveyed however he can easily convey fine particle.
1) see here i want ur attention ie he is using compressor of rating say x which is commen for both bottam sah and fly ash as well,
fly ash is easily being conveyed biut bottom ash does not what may be the technical reason will
2) is coarse particle require more pressure than fine ash if yes why we are using comman compressor for both one
thnx
rahul
****STARS PALIN ■
Re: Coarse Particle Req More Pressrue
Dear Rahul,
The suspension velocity of the coarse particles is higher then the suspension velocity for the finer particles.
Therefore the coarse particles require a higher velocity to be conveyed than the finer particles.
If the velocities in your client’s case are in between those velocities than the finer particles will convey and the coarser particles will fall out of the airstream.
Increasing the air velocity will keep the coarser particles in suspension and conveying will take place.
The finer particles will be kept in suspension as before.
The pressure is a result of the SLR of the conveying mixture and is related to the conveying properties of the material.
Velocity is the parameter to consider
Also the feeding of the system is an issue to attend to.
best regards
teus ■
Teus
Re: Coarse Particle Req More Pressrue
Dear Mr teus
According to you coarse particle suspension velocity is high than fine ash, that implies we should use having the high velocity say around 8m/s.
Ok whatever the reason may be but here the issue is to rectify the matter, imean if i reduce the line size if inlet air comming to bottom ash than perhabs we may expeleout from the problem bcoz acc to my perception if we reduce the line size pressure gets reduced and consecutive air velocity gets increased
Now here i need to be adviced by you whether my perception is correct
Take care
rahul
Lovely Wendie99 ■
Re: Coarse Particle Req More Pressrue
Dear Rahul,
I made a table to show how the various parameters are related to each other.
Because of the many parameters involved, it is rather difficult to overlook the effects of changing one parameter as this changes effects more than one other parameters, sometimes even with opposite effects on the capacity.
Read horizontally!
pressure-------- air volume------ diameter----- velocity---------- Solid Loading Ratio------- capacity
==========================================================================
constant------ constant -------down---------- up------------- constant ----------------down
constant------- up------------- constant------ up ------------- down------------------- approx const
constant------- up--------------- up-------- constant -------- constant--------------------- up
down----------- up--------------- up-------- constant----------- down--------------------- constant
This table might seem not so easy to interpret, but is based on the many table calculations I made.
Those table calculations revealed unexpected relationships. (at least unexpected for me), which made it possible to make preliminary designs that are close to the desired solution.
Recalculation of an actual design will always be necessary.
Pneumatic conveying is not so easy that it can be described on a A4
have a nice day
teus ■
Teus
Clarification Req
Teus Tuinenburg
Dear sir
Thnx for your reply, but these table unable to conceive me. Perhabs iam not aware about the same how to use and would be out of my perception range
Can you provide me the calculation for air requirement to convey the material in densephase, although iam having all those data required to be entere in formula.
Thanx in anticipation
Group Sex Cam ■
Re: Coarse Particle Req More Pressrue
Dear Rahul,
first a correction (sorry)
pressure-------- air volume------ diameter----- velocity---------- Solid Loading Ratio------- capacity
==========================================================================
constant------ constant -------down---------- up------------- down ----------------down
Read the line from the left to the right.
If you keep the pressure cconstant and if you keep the air volume constant and you decrease the pipeline diameter
then:
the velocity increases and the SLR has to be lowered in order to keep the pressure constant and as a consequence of the lower SLR. the capacity decreases.
This shows how complex the relationship is between the various parameters.
If you have the data required for input, may be the excel sheet of mr Amrit Agarwal is a solution.
(Remeber ; each program requires its own input values)
success
teus ■
Teus
Re: Coarse Particle Req More Pressrue
teus
Dear sir
your reply is of great importation
can you provide that excel sheet of mr agarwal, what we are talking about. May be that would be able to conceive my problem and wud able to perceive how various parameters in this segmaents tends to effect on others
Looking for your valuable reply
Take care
rahul
NEW JERSEY MEDICAL MARIJUANA ■
Re: Coarse Particle Req More Pressrue
Dear Rahul,
Please send your request for the article and spreadsheet to the address given below:
Amrit Agarwal
Consulting Engineer
Pneumatic Conveying Consulting
Email: polypcc@aol.com
Ph and Fax: 304 346 5125
success ■
Teus
Coarse particle req more pressrue
Dear Teus Tuinenburg
hope ur fine.
Here is my query , if u take interest to hel me out
will coarse particle will require more pressure to convey than fine ash ?
i mean to highlight the problem of one of my client.ie he is not able to convey the bottom ash however is able to convey the fine ash . can u enlighten me about the problem he may be facing. During my courtsy visit to their plant i had a look on their plant hand resulted that they hve reduced the line size of compressed air line. Our system require 3bar pressuer in densephase but the pressure on receiver is 2.5 bar
thax in anticipation
regards
rahul
Lovely Wendie ■