Pneumatic System Performance Issues
Originally Posted by ramyy
I am working at carboxy methyl cellulose plant an we have a major problem about cohesion of particles in dryer.
can any one help me by describe how to avoid this problem
thank you all
Hello Ramyy,
We need more information to help us to help you,
Are you using a pressure gradient to eject the Carboxy Methyl Cellulose from the dryer? Is this the issue?
Are you sure the particles are not to moist to allow efficient conveying with pressure gradient?
What has changed recently-major or minor repairs, bad seals, piping, gaskets, feed stock suppplier?
Have you examined the net efficiency of the air compressor? per haps you need new air filters?
If you are using a blower what type is it? ■
Re: Evaluation Of Pneumatic System Performance
Dear ramyy,
As Izaharis stated, more specific info is needed.
Evaluating a pneumatic conveying system is possible by comparing the design (including parameters) with the actual performance and behavior of the installation.
A description of the installation and carboxy methyl cellulose properties (particle size, particle density, bulk density, humidity, etc.) is therefore required.
A pneumatic conveying calculation, based on the design can easily be made.
However, you already used the word cohesive and that is a problematic property in pneumatic conveying.
In addition, you mention that the problem occurs in a dryer, indicating that the material is wet.
Where is this cohesiveness causing problems? In the feeding part of the installation or in the conveying part of the installation?
Is the problem new or was it manifest from the beginning?
Is the problem a pneumatic conveying problem?
Is the problem a dryer problem?
Have a nice day
Teus ■
Teus
Re: Evaluation Of Pneumatic System Performance
lzaharis & Teus Tuinenburg,
thanks for replying
I hope to give an overview of the process:
the CMC after formed in the reactor is moisturized by ethanol which is the medium of reaction.
then moisturized CMC is transferred to the stripping unit by screw in order to remove ethanol by steam.
then dropping CMC (which is now wet by water) in the dryer by duct
the drying process is occurred by passing hot air through the screen which carries the CMC in the dryer
there is a blower & dust filter over dryer to collect dust.
the movement of CMC in the dryer by vibration from the beginning to the end of the dryer.
at the end of the dryer there is rotary valve to transfe pneumatic system.
the air which is entering the dryer at its first third at 80c and at the second third is 60c and at the remaining third is 30c
the problem is occurring at the first third (the entering of CMC) is cohesion of small paricles forming big mass whic is difficult to pass through rotary valve to pnematic system. and also it will block the line
thank you again ■
Re: Evaluation Of Pneumatic System Performance
Dear ramvy,
The formation of CMC agglomerations by cohesion is taking place in the dryer, which is before the pneumatic conveying system.
The rotary lock feeds the formed caked CMC into the pneumatic conveying system.
If those bigger formed particles are choking the pipeline, caused by sedimentation, this could be an indication that the conveying airflow is too low.
To check this assumption, a system description and a particle size distribution (including the CMC agglomerations) is required.
Is there a way to prevent the formation of bigger CMC agglomerations?
Have a nice day
Teus ■
Teus
Evaluation of Pneumatic System Performance
How to Evaluate Pneumatic System Performance
Please can any one help me by describing any method for evaluation performance of existing pneumatic system.
I am working at carboxy methyl cellulose plant and we have a major problem about cohesion of particles in dryer.
Can any one help me by describe how to avoid this problem?
Thank you all. ■