MEI venturis have been used on veneer dryers with great success in US and Canada. This includes both Jet Dryers and Longitudinal Dryers.
Qualifying the Application and Sizing the Orifice of a Venturi for Optimal Performance of a Veneer Dryer
Several factors are taken into consideration when qualifying and sizing a Dryer for conversion to venturis:
- How is the dryer zoned? What is the direction of air flow? How are the coils arranged?
- What is the rated maximum and running load of the Dryer? (manufacturer specs)
- MEI also needs the steam pressure, notes how the dryer is regulated, and requires a drip leg present before each control? How the condensate return is set up is important. Is there lift in the return, or is the condensate gravity fed to the receiver? What is the condensate return back pressure? What is the lift in the condensate return and the diameter of return line?
For Longitudinal Dryer
- Individually trap each superheater coil and each section of deck coil.
- Determine the percentage of load between superheater coils and deck coils.
- Estimate the relative ratio of loads between green end and dry end in relationship to zoning and air flow.
For Jet Dryer
- Individually trap each coil on each fan.
- Determine the relative ratio of loads between first coil and last coil on each fan
- Determine the relative ratio of loads between green end and dry end.
MEI has both mathematically and empirically developed a solid algorithm for sizing the orifice for each venturi throughout the veneer dryer.