Dear Visanu,

How is the marerial fed into the pipe line.

Suction nozzle or rotary airlock or gravity mixing inlet?

Is there a rotary lock underneath the filter-receiver bin?

Material feeding influences the initial intake pressure drop.

A rotary lock underneath the receiving bin causes air leakage, which has to be compensated for by the vacuum pump.

Have a nice day

Teus ■

Dear Visanu,

How is the marerial fed into the pipe line.

Suction nozzle or rotary airlock or gravity mixing inlet?

Is there a rotary lock underneath the filter-receiver bin?

Material feeding influences the initial intake pressure drop.

A rotary lock underneath the receiving bin causes air leakage, which has to be compensated for by the vacuum pump.

Have a nice day

Teus ■

Dear Visanu,

I forgot to ask for the particle size of the CaCO3.

Sorry

Teus ■

Dear Visanu,

I forgot to ask for the particle size of the CaCO3.

Sorry

Teus ■

Hi, I am make my PHD studies in Mxico, please I need your paper, Can you send me a paper copy?..thanks

Best regards

Luis Manuel ■

Hi, I am make my PHD studies in Mxico, please I need your paper, Can you send me a paper copy?..thanks

Best regards

Luis Manuel ■

Dear matiasjf,

I think that your air pump is not a blower (positive displacement characteristic), but a centrifugal fan.

39 m3/min at 2500 Pa # 250 mmWC

A change in pressure causes a change in air flow.

Suppose that one fan has a too big pressure, the airflow decreases and the snacks start slowing down.

The lower snack velocity causes an increasing pressure and so on, until the conveying line blocks.

Changing the fans for a blower of the right size should solve your problem.

The cyclone is not the cause of your problem, because the end pressure is for both systems the same.

Check the fan curves and measure the fan pressures under operation.

Success

Teus ■

Dear matiasjf,

I think that your air pump is not a blower (positive displacement characteristic), but a centrifugal fan.

39 m3/min at 2500 Pa # 250 mmWC

A change in pressure causes a change in air flow.

Suppose that one fan has a too big pressure, the airflow decreases and the snacks start slowing down.

The lower snack velocity causes an increasing pressure and so on, until the conveying line blocks.

Changing the fans for a blower of the right size should solve your problem.

The cyclone is not the cause of your problem, because the end pressure is for both systems the same.

Check the fan curves and measure the fan pressures under operation.

Success

Teus ■

Originally Posted by Teus Tuinenburg

Dear Visanu,

How is the marerial fed into the pipe line.

Suction nozzle or rotary airlock or gravity mixing inlet?

Is there a rotary lock underneath the filter-receiver bin?

Material feeding influences the initial intake pressure drop.

A rotary lock underneath the receiving bin causes air leakage, which has to be compensated for by the vacuum pump.

Have a nice day

Teus

Thank for your quick answer.

Material is fed by gravity.

We have shutoff valve underneath the filter-receiver bin.

Particle size would be around 15-20 micron. ■

Originally Posted by Teus Tuinenburg

Dear Visanu,

How is the marerial fed into the pipe line.

Suction nozzle or rotary airlock or gravity mixing inlet?

Is there a rotary lock underneath the filter-receiver bin?

Material feeding influences the initial intake pressure drop.

A rotary lock underneath the receiving bin causes air leakage, which has to be compensated for by the vacuum pump.

Have a nice day

Teus

Thank for your quick answer.

Material is fed by gravity.

We have shutoff valve underneath the filter-receiver bin.

Particle size would be around 15-20 micron. ■

Dear Visanu,

I did a quick design calculation of which the results are given in the attached pdf.

These calculations can only be regarded as an indication.

1500 kg/hr is not much. (2 buckets per minute) and the distance (10 m) is very short.

Have a nice day.

Teus

Attachments

visanu (PDF)

■

Dear Visanu,

I did a quick design calculation of which the results are given in the attached pdf.

These calculations can only be regarded as an indication.

1500 kg/hr is not much. (2 buckets per minute) and the distance (10 m) is very short.

Have a nice day.

Teus

Attachments

visanu (PDF)

■

Dear Teus,

Thank again for your calculation. I note that property of calcium cabonate on your calculation sheet is different from what we have. We have bulk density of 1000 kg/m3 and particle size of 15-20 micron. How do this affact to the result of your calculation? Could you please do the calaulation again for these properties with

conveying rate increase up to 5000 kg/hr and material is fed by screw feeder with the same rate of conveying.

Your help is much appreciated.

Yingsak.K ■

Dear Teus,

Thank again for your calculation. I note that property of calcium cabonate on your calculation sheet is different from what we have. We have bulk density of 1000 kg/m3 and particle size of 15-20 micron. How do this affact to the result of your calculation? Could you please do the calaulation again for these properties with

conveying rate increase up to 5000 kg/hr and material is fed by screw feeder with the same rate of conveying.

Your help is much appreciated.

Yingsak.K ■

Dear Yingsak,

The particle density is taken correctly in the calculations?

BR

Teus ■

Dear Yingsak,

The particle density is taken correctly in the calculations?

BR

Teus ■

Dear Yingsak,

As requested the revised preliminary calculation.

Still consider this calculation is not a final design.

Take care

Teus

Attachments

visanu2 (PDF)

■

Dear Yingsak,

As requested the revised preliminary calculation.

Still consider this calculation is not a final design.

Take care

Teus

Attachments

visanu2 (PDF)

■

Dear matiasjf,

What happens is the following:

The systems are not exactly identical

The two feedrates are not exactly identical

The two fans are not exactly identical

Therefore, the 2 fans are not running at exactly the same point on their pv curve

When one system is running the end back pressure from the cyclone has a certain value.

Switching on the second system creates a higher air flow through the cyclone and therefore a higher end pressure.

The higher end pressure is also seen by the two fans.

As a result of this, they shift on their respective pv-curves to a higher pressure and therefore a lower airflow.

One of the systems changes to unstable conveying and reduces even more in airflow.

The other system sees the resulting lower end pressure and starts conveying again.

Centrifugal fans are tricky air movers in a pneumatic conveying system.

Positive displacement blowers do not have this problem.

As mr Vikas Gaikwad suggested, a second cyclone also solves the problem

Have a nice day

Teus ■

Dear matiasjf,

What happens is the following:

The systems are not exactly identical

The two feedrates are not exactly identical

The two fans are not exactly identical

Therefore, the 2 fans are not running at exactly the same point on their pv curve

When one system is running the end back pressure from the cyclone has a certain value.

Switching on the second system creates a higher air flow through the cyclone and therefore a higher end pressure.

The higher end pressure is also seen by the two fans.

As a result of this, they shift on their respective pv-curves to a higher pressure and therefore a lower airflow.

One of the systems changes to unstable conveying and reduces even more in airflow.

The other system sees the resulting lower end pressure and starts conveying again.

Centrifugal fans are tricky air movers in a pneumatic conveying system.

Positive displacement blowers do not have this problem.

As mr Vikas Gaikwad suggested, a second cyclone also solves the problem

Have a nice day

Teus ■

Dear matiasjf,

You are welcome.

Have a nice day

Teus ■

Dear matiasjf,

You are welcome.

Have a nice day

Teus ■

Dear Amrit Agarwal,

Can you send me your calculation sheet to :

f.jacob@sodimate.com

Thanks in advance & best regards,

François ■

Dear Amrit Agarwal,

Can you send me your calculation sheet to :

f.jacob@sodimate.com

Thanks in advance & best regards,

François ■

Dear Amrit Agarwal,

Can you send me your calculation sheet to :

grb35@sympatico.ca

Thanks in advance & best regards,

George ■

Dear Amrit Agarwal,

Can you send me your calculation sheet to :

grb35@sympatico.ca

Thanks in advance & best regards,

George ■

Hi people, i have used Amrit's notes to assist me with a pneumatic conveying design. the document called Theory and Design of Dilute Phase Pneumatic Conveying Systems will greatly with teh fundamentals. The paper will add value and stimulate ones thinking which happened in my case when i was selecting a pipe and trying to fine tune my solids ratio. Nomographs take you so far but with Amrits notes, i understood what i was doing with certainty. By the way, thsi was the first pneumatic system design i did so teh notes was invaluable to me as a beginner in this field ■

Hi people, i have used Amrit's notes to assist me with a pneumatic conveying design. the document called Theory and Design of Dilute Phase Pneumatic Conveying Systems will greatly with teh fundamentals. The paper will add value and stimulate ones thinking which happened in my case when i was selecting a pipe and trying to fine tune my solids ratio. Nomographs take you so far but with Amrits notes, i understood what i was doing with certainty. By the way, thsi was the first pneumatic system design i did so teh notes was invaluable to me as a beginner in this field ■

Dear Mr. Agarwal

Thank you for sending me your article about "Theory and Design of Dilute Phase Pneumatic Conveying Systems".

I find it very intresting reading it and will certainly have use of it when I am designing pneumatic conveying systems. I also would like to say that the instruction for the spreedsheat was easy to follow and I have now completed it and have it working.

Thanks again!

Best Regards

Emil ■

Dear Mr. Agarwal

Thank you for sending me your article about "Theory and Design of Dilute Phase Pneumatic Conveying Systems".

I find it very intresting reading it and will certainly have use of it when I am designing pneumatic conveying systems. I also would like to say that the instruction for the spreedsheat was easy to follow and I have now completed it and have it working.

Thanks again!

Best Regards

Emil ■

Hello Mr Argawal,

Thanks a lot for your very interesting article about diluted phase pneumatic system that you accept to send to me. The article is very well documented and it's quiet easy to create an excel file to automatized the calculation. Even if I'm not very well skilled in this kind of excel sheet, I've made it very fast.

Thanks a lot for your free help,

François ■

Hello Mr Argawal,

Thanks a lot for your very interesting article about diluted phase pneumatic system that you accept to send to me. The article is very well documented and it's quiet easy to create an excel file to automatized the calculation. Even if I'm not very well skilled in this kind of excel sheet, I've made it very fast.

Thanks a lot for your free help,

François ■

Dear Armit Agarwal

Could you please send me a copy of this article?.

My email is andres.millerv@gmail.com

Thanks you very much. ■

Dear Armit Agarwal

Could you please send me a copy of this article?.

My email is andres.millerv@gmail.com

Thanks you very much. ■

Dear Sir,

Can you send me a copy of Theory and Design of Dilute Phase Pneumatic Conveying Systems.

Warm Regards

RR Jalali

rrjalali@maxmsp.com ■

Dear Sir,

Can you send me a copy of Theory and Design of Dilute Phase Pneumatic Conveying Systems.

Warm Regards

RR Jalali

rrjalali@maxmsp.com ■

Hello Mr. Amrit,

My name is Ho, and I am a process engineer.

Recently, I am studying pneumatic conveying system.

I would like to have a chance to read your article and related Excel Program "Theory and Design of Dilute Phase Pneumatic Conveying Systems".

It will be very helpful to my study and my future works.

Please kindly send it to me.

Much appreciate the effort.

Thank you kindly,

Ho ■

Hello Mr. Amrit,

My name is Ho, and I am a process engineer.

Recently, I am studying pneumatic conveying system.

I would like to have a chance to read your article and related Excel Program "Theory and Design of Dilute Phase Pneumatic Conveying Systems".

It will be very helpful to my study and my future works.

Please kindly send it to me.

Much appreciate the effort.

Thank you kindly,

Ho ■

Dear Sir

According to you`re E-mail feed back . could you send me a copy of you`re artical

Thanks

A. Awad ■

Dear Sir

According to you`re E-mail feed back . could you send me a copy of you`re artical

Thanks

A. Awad ■