Dear chavannilesh,

-A bulk density range of 0.54-1.3 t/m3 is too wide or is this 0.54 t/m3 bulk density and 1.3 t/m3 material density?

-(pick up-drum/container) is this an indication of a vacuum system?

-If this system is a vacuum system, how is the feeding arranged?

-(discharge-4 hopper). Is this meaning a 4” pipe line to a filter-hopper?

-If this system is a vacuum system, how is the hopper unloading arranged?

Are you asking someone to help you with the design or are you asking someone to do the design for you?

-If it is a vacuum system, then the RH in the suction pipe is always below 100%

-If it is a pressure system, then the RH in the suction pipe can be above 100%

-Altitude above sea level

-Particle size

-Solid loss factor

-Filter size

-Air leakages

-PLC controls

-Etc.

Consulting a well-known supplier is a much safer way to go. ■

Dear chavannilesh,

Your system GA design is quite clear.

However, there are several design details, which make this system very difficult to calculate and consequently to operate.

-It is a suction system with a nozzle intake, meaning that the nozzle setting controls the conveying rate.

-The nozzle intake pressure drop is not known and should be tested before in a lab setting.

-The sugar air separation is done by 4 cyclones

-The sugar dust separation is done by one filter

-The sugar separation should be done by 4 filters instead of the 4 cyclones, reducing the conveying vacuum. (A vacuum system has a limited conveying vacuum and reducing the conveying pressure drop makes the system more efficient and allows for a higher conveying rate)

-Your question “Dehumidifier is required?” is a non-question as you then must dehumidify the ambient air.

-A centrifugal fan delivers a varying air flow, related to the vacuum.

-The calculation of your design is very, very difficult

-The sugar conveying part has a sugar SLR determined by the conveying rate and the centrifugal fan curve

-The sugar dust conveying part has a sugar dust SLR determined by the cyclone efficiency and the centrifugal fan curve

Consulting a well-known supplier is a much safer (only) way to go.

I do not believe that you will not get the information, which you need, here. ■

Dear chavannilesh,

A vacuum positive displacement pump has an almost constant volume displacement, independent from the vacuum. (Internal leakage ignored).

The displaced volume of a centrifugal fan is a function of the vacuum. This complicates the calculations and increases the chance of choking when the volume displacement becomes too low due too to a too high vacuum.

It is for a pneumatic conveying engineer a must to understand the compressor technology and the influence of the selected compressor on the pneumatic conveying performance.

Therefore it is a must to be familiar with the molecular gas theory https://en.wikipedia.org/wiki/Kinetictheoryofgases and thermodynamics, flow dynamics, Newton laws and the law of conservation of energy. ■

Dear Chavannilesh,

I have seen you application drawing and, in our opinion, for a stable and controlled operation, there should be some capacity control device (as detailed presented by Mr. Teus).

I think it is a sugar feeding system for the mixers of a biscuit factory.

Please see the attachment. If you have any question, just let me know.

I assumed the sugar is brought by Big-Bag of bags and assumed also that at one specific moment, only one mixer is fed with sugar.

Just one correction note: the air colleting collecting pipe from cyclones should have a diam. of 140-150 mm and not 200 mm as in the drawing.

In the attached drawing i considered slightly longer distances than mentioned in your post.

Please remember, as Mr. Teus already mentioned, that the pressure-flow operation point for the ventilators is changing if one of them is changed.

For to help in better understanding please see also:

href="http://tecnocereal.com/wp-content/uploads/2015/03/Regime-Mixing-Ratio.pdf" target="blank">http://tecnocereal.com/wp-content/up...xing-Ratio.pdf

I think it is biscuit plant feeding system.

Have a nice day,

Tanase TANASE

Attachments

flow chart vacuum sugar conveying 1500 kg-h 290720 (PDF)

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Dear Chavannilesh,

The explosion vent mentioned for the filter is part of it and it is sized according to some specific norms and filter construction.

The design of it is made by the filter manufacturer.

Kindly ask to the filter supplier to deliver it with certified explosion proof panel.

Wish you all a good new week,

Tanase TANASE ■