Dense Phase Conveying Fly Ash from Baghouse

Posted in: , on 12. Aug. 2014 - 15:14

Hi,

I'm new member.

Could you tell me about this calculation for fly ash:

Material flow rate: 5 T/h

Material: fly ash, bulk density: 700kg/m3.

Pipe lenght: 30m H, 16m V, and have 5 bends.

I use Equation from Pneumatic conveying design guide (David Mills) and have:

solid loading ratio: 60

Pipe bore: 53mm

Air mass flow rate is 0.027 kg/s

Conveying line pressure drop is: 0,8 Bar.

Could u tell me the problem in this calculation?

what the power of compressor need? and piston or srew compressor is better chose?

With this capacity and fly ash, use dilute phase or dense phase?

Thanks!

Tuan ■

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Re: Dense Phase Conveying Fly Ash From Baghouse

Erstellt am 12. Aug. 2014 - 07:51

Dear Tuanle,

Particle size is not mentioned.

Feeder system is not mentioned.

Solid loading ratio from your data:

Fly ash rate = 5000 kg/3600 sec = 1.3889 kg/sec

In combination with an air flow of 0.027 kg/sec:

SLR = 1.3889 / 0.027 = 51.44 (Not the mentioned SLR = 60)

Assuming a particle size of 30 micron:

6.45 tons/hr at 0.8 barg

5 t/hr at 0.53 barg

air velocity = 6.3 m/sec to 11.9 m/sec

Success

Teus ■

Teus

Re: Dense Phase Conveying Fly Ash From Baghouse

Erstellt am 14. Aug. 2014 - 12:14
Quote Originally Posted by Teus TuinenburgView Post
Dear Tuanle,

Particle size is not mentioned.

Feeder system is not mentioned.

Solid loading ratio from your data:

Fly ash rate = 5000 kg/3600 sec = 1.3889 kg/sec

In combination with an air flow of 0.027 kg/sec:

SLR = 1.3889 / 0.027 = 51.44 (Not the mentioned SLR = 60)

Assuming a particle size of 30 micron:

6.45 tons/hr at 0.8 barg

5 t/hr at 0.53 barg

air velocity = 6.3 m/sec to 11.9 m/sec

Success

Teus

Dear Mr, Teus Tuinenburg.

Thank you for reply!

This is the frist time I learn design pneumatic conveyor, I don't have experienced. Can you help me?

Particle size : under 100 micro-90% and 10% from 100-300 micro.

I have 6 pipelines:

- Two line conveying from multicyclone with coarse ash.

- Four line conveying from baghouse with fine ash.

And I don't know what types of blow tanks (top and bottom discharge) will better for this? In line fine ash, have two point feed, need stepped pipelines at second point feed?(53 bore and next is 65).

You can see pipelines in file attach

Thanks!

Tuan

Attachments

dense phase (PDF)

■

Re: Dense Phase Conveying Fly Ash From Baghouse

Erstellt am 21. Aug. 2014 - 05:06
Quote Originally Posted by Teus TuinenburgView Post
Dear Tuanle,

What you draw in the attached pdf is an Ashveyor from Macawber.

http://www.macawber.com/products-ser...ying/ashveyor/

Not much more to say about the system.

The previous made calculation is still valid.

Success

Dear Mr. Teus Tuinenburg,

Thank you very much!

Tuan. ■

Re: Dense Phase Conveying Fly Ash From Baghouse

Erstellt am 11. Sep. 2014 - 02:22

Suggest you also run these calculations using the method given in my article " Theory and Design of Pneumatic Conveying Systems". I will be glad to send a copy of this article if you need it, and will also help you in the use of this article. Main problem in fly ash conveying is abrasive wear of pipeline. Design of the conveying system must minimize this problem by use of wear-resistant materials or using dense phase.

Regards,

Amrit Agarwal

Pneumatic Conveying Consulting

Email: polypcc@aol.com ■

Re: Dense Phase Conveying Fly Ash From Baghouse

Erstellt am 24. Sep. 2014 - 06:10
Quote Originally Posted by Amrit AgarwalView Post
Suggest you also run these calculations using the method given in my article " Theory and Design of Pneumatic Conveying Systems". I will be glad to send a copy of this article if you need it, and will also help you in the use of this article. Main problem in fly ash conveying is abrasive wear of pipeline. Design of the conveying system must minimize this problem by use of wear-resistant materials or using dense phase.

Regards,

Amrit Agarwal

Pneumatic Conveying Consulting

Email: polypcc@aol.com

Dear Mr. Amrit Agarwal,

Thanks for your respond,

With fly ash, wear-resistant materials will need at near end of pipe conveying (discharge) if use dense phase because the velocity will rise when pressure drop along pipe conveying (almost wear at bend). Would you help me know where is the best design for this problem? Use wear-resistant materials or use Blind Tee, smart elbow ?

Could you please share your calculations to me? My email: aliastct@gmail.com

Best regards,

Tuan ■

Re: Dense Phase Conveying Fly Ash From Baghouse

Erstellt am 25. Sep. 2014 - 11:13
Quote Originally Posted by TuanleView Post
Dear Mr. Amrit Agarwal,

Thanks for your respond,

With fly ash, wear-resistant materials will need at near end of pipe conveying (discharge) if use dense phase because the velocity will rise when pressure drop along pipe conveying (almost wear at bend). Would you help me know where is the best design for this problem? Use wear-resistant materials or use Blind Tee, smart elbow ?

Could you please share your calculations to me? My email: aliastct@gmail.com

Best regards,

Tuan

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Dear Tuan,

If you use dense phase, start with as low a pick up velocity as is practical and minimize the pipeline pressure drop by using a stepped pipeline if needed. Try to select terminal velocity at about 20 ft/sec maximum. This criteria will reduce pipeline wear to a minimum.

Bends will still have some wear on their outer surface due to centrifugal friction. To prolong bend life, I would suggest using special bends such as Hammertec, or bends with a wear-resistant replaceable outer liner. Pipe line itself can be a hardened grade of steel or stainless steel.

Regards,

Amrit Agarwal

Pneumatic Conveying Consulting ■

Re: Dense Phase Conveying Fly Ash From Baghouse

Erstellt am 30. Sep. 2014 - 09:06
Quote Originally Posted by Amrit AgarwalView Post
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Dear Tuan,

If you use dense phase, start with as low a pick up velocity as is practical and minimize the pipeline pressure drop by using a stepped pipeline if needed. Try to select terminal velocity at about 20 ft/sec maximum. This criteria will reduce pipeline wear to a minimum.

Bends will still have some wear on their outer surface due to centrifugal friction. To prolong bend life, I would suggest using special bends such as Hammertec, or bends with a wear-resistant replaceable outer liner. Pipe line itself can be a hardened grade of steel or stainless steel.

Regards,

Amrit Agarwal

Pneumatic Conveying Consulting

Dear Mr. Amrit Agarwal

Thank for your reply!

Best regards,

Tuan ■