Hi Mr Tuinenburg

It has been a pleasure to at last be able to write to you after an interesting read of your various writings in this forum.

I have been given a task to design a cement transport system using "diluted phase transport positive pressure system". Honestly i am not too familiar with this system albeit my involvement before. It will be an honor to me if you could give me a design calculation on the system based on the information below :-

(Please see the attached drawing of flow process for clearer picture)

1. Cement source will be taken from 3000 ton silo, by means of control flow gate (capacity gate), airslide (40x30cm) and rotary airlock.

2. Proposed transfer rate is 70 ton per hour.

3. Length of pipe (bore to be determined), horizotal 2.5mtr, 90 deg elbow, vertical 35mtr, 90 deg elbow, horizontal 5mtr, 90 deg elbow (horizontal), horizontal 12mtr, 90 deg elbow (horizontal), horizontal 5mtr, and connected to blind T-pipe.

4. Bore to be determined, thank you.

5. Proposed blower : Root Blower (please determine the capacity of motor if any)

6. Blind T-Pipe is on top of a 5 ton buffer bin (dia. approx 1.5mtr, H 3-4mtr) - due to space constraint, bin is to be designed to fit the space.

7. From the buffer bin then transfered to screw screen and airslide system.

8. From airslide then to be distributed to packer machines (4 units)

Could you please provide design information as needed to build such system, i.e. bore dia, fan air flow, fan pressure, kW, etc. Your comment on the system is very much appreciated especially on the buffer bin and airslide system.

Thank you very much for your attention.

Regards,

Ardi

Originally Posted by Teus Tuinenburg

href="showthread.php?p=92014#post92014" rel="nofollow">

A pneumatic conveying system can be considered as a “Complex System”.

A complex system is defined by the following characteristics and criteria:

-Many variables, interacting within the system and with the surrounding (open complex system)

-The outcome cannot be derived from the system variables/properties separately.

-The system contains many feedback loops.

-Nonlinear.

-Must be solved in domain -specific context (time domain or spatial domain)

-Starting values of the solving algorithm must be close to the thermodynamic equilibrium

-Simplifying solving algorithms lead to inaccurate and not useful results.

A pneumatic vacuum unloader/pressure discharger are in fact 2 complex systems, interacting with the ship to be unloaded and with the silo to be loaded.

A complex system can be extended by external system design influences s.a. material properties, ambient conditions, equipment selection, etc.

The pneumatic conveying calculation, developed by

href="http://www.Yarca.nl" target="blank">www.Yarca.nl , meets all the above criteria.

Attachments

process flow chart 70tph (PDF)

■