DIRECT FIRED PROCESS

Ronning’s Direct Fired Three-Stage Dryer System is the traditional configuration for our single-pass rotary dryer and is typically fired with natural gas.

In this system, the wet product or ingredient enters the Three-Stage Dryer Drum where it meets with the products of combustion and travels through three stages of flighting. The ingredients and combustion gases mix with the water vapor that evaporates from the product.

A portion of the dried product is recycled by conveyor back to the front of the dryer to be mixed with wet product to improve product flowability and to maximize the product heat transfer ratio. Finished product conveys to the Cooling & Conditioning Drum for additional evaporation, cooling to near ambient temperature and for storage if needed for a smooth flow to further processing or storage.