Introduction

Dry bottom ash discharge systems remove, cool and convey incinerator bottom ash without water quenching. Controlled air cooling improves metal extraction and enables the recovery of heat back into the system. Fully encapsulated extraction and conveying systems ensure dust-free operation, stable combustion conditions and delivery of dry ash for advanced downstream processing. Kanadevia offers two dry extraction approaches.

Extraction approaches:

Ram-type dry bottom ash extractor

A hydraulically driven ram intermittently discharges bottom ash from an enclosed extraction chamber. Air sealing is achieved using the bottom ash itself, which is cooled by controlled air flow within the system and discharged in batches to downstream handling equipment. The compact and robust design tolerates variable ash characteristics and is well-suited to installations with limited space. 

Apron-type dry bottom ash extractor

Bottom ash is continuously discharged onto a fully encapsulated, air-cooled steel apron conveyor. Metal plates along the conveyor seal against false air. Cooling is achieved by controlled air flow through the ash bed, and the recovered heat is returned to the combustion process. The enclosed design prevents dust emissions, maintains furnace sealing and delivers dry, cooled IBA (incinerator bottom ash) for downstream treatment.