Yankee air systems are energy intensive and should routinely be checked to ensure that they run at an optimal level. A proper hood balance ensures maximum thermal efficiency (i.e. BTU (fuel) per ton of paper).
A simple survey allows the papermaker to verify hood performance and balance the air systems.
These surveys can often result in significant savings in burner fuel and fan horsepower consumption.
After successfully installing a heat recovery system to preheat combustion and make-up air, our client requested we conduct a Drying Performance audit of his Yankee Hood.
The objective of the survey was as follows:
1) Determine the actual performance values of the hood and Yankee cylinder and compare these values to the industry standard.
2) Adjust the balancing of air systems to optimize hood performance while minimizing gas consumption.
3) Make short and long term recommendations to obtain additional drying capacity and/or reduce energy consumption.
Some major findings derived from our Yankee cylinder/hood drying performance analysis: