Objectives of Dryers 

The basic objectives of a dryer control system are 

• Maintenance
• Maximization
• Avoidance 
• Reduction 
• Suppression 
• Stable 
• Optimization

Maintenance : Maintenance of desired dried product quality, irrespective of disturbances in the drying operation and variations in feed supply

Maximization : Maximization of throughput at optimal energy efficiency and minimum cost.

Avoidance : Avoidance of over drying and under drying; under drying may result in spoilage, in the case of grains and foodstuffs, whereas over drying of the product results in increased energy costs and reduced yields as the price of some products is based on a specific moisture content; it may also cause thermal damage to heat-sensitive products 

Reduction : Reduction of fire hazard, defective product, and particle emission

Suppression : Suppression of the influence of external disturbances

Stable : Stable drying process

Optimization : Optimization of the performance of the drying process