Re: Weigh Belt Feeding Pneumatic Conveyor
If mass-flow and systems pressure loss are moderate I would recommend to use an ejector (venturi) instead of rotary airlock.
Please visit the following website for more informations:
http://www.enviro-engineering.com
Best regards from Cologne, Germany
Klaus Schneider, KS-Engineering ■
Weigh Belt Feeding Pneumatic Conveyor
This is, in many ways, an ideal arragement. The feed rate is controlled so the rotary valve cannot be overloaded.
The material must not be dropped directly into the valve, however, otherwise you will have problems with aeration and poor filling of the valve pockets.
Provide a 60 deg. chute for the material to slide down into the pockets.
Michael Reid. ■
Re: Weigh Belt Feeding Pneumatic Conveyor
Pfister, Germany manufactures Rotor Scales , which have the weighing & dozing functions & the material can directly be conveyed pneumatically,without the need of the weighing belt. Kindly specify the flow rate & the material specs in order for me to recommend you a suitable system. You may send your queries to following :
Attn - P.J.Talreja
email- sales@transweigh-india.com or pjt@transweigh-india.com ■
Weigh Belt Feeding A Pressure Type Pneumatic Conveying System
Pressure type pneumatic conveying systems need higher pressure or an airlock at the feed point to prevent loss of conveying gas. Belt type conveyors will need an airlock at their discharge to be able to feed into a pressure type conveyor. This airlock can be a rotary valve or some other method. When using a belt type conveyor, make sure that its volumetric feed rate is about 10% less than that of the rotary valve.
Regards,
A. T. Agarwal
Consulting Engineer
Pneumatic Conveying Consulting Services
Email: polypcc@aol.com
Ph and Fax: 304 346 5125 ■
Weighbelt - Pneumatic
The previous respondents to your thread make no mention of two factors that are key to the success of such an arrangement.
1) even though this is a low pressure (dilute-phase) application it is important that a low-leakage valve be used in this application.
2) the rotary valve should have an efficient vent design that channels leakage air away from the incoming feed.
These two features work together to insure that the metered feed is smoothly fed into the conveying system.
Dennis Hauch, PE ■
Weigh belt feeding pneumatic conveyor
I want to feed directly from a weigh belt (enclosed) to a pneumatic conveying system (pressure dilute).
There is concern about feeding directly into a rotary airlock.
The material is free flowing.
Please comment if you have direct experience with this type of arrangement. ■