Residue Treatment
Dry bottom ash discharge and conveying

High-efficiency plants. Circular economic strategies. Long-term value creation.

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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 concepts.

Concepts

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 is 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. The sealing against false air is performed by metal plates along the conveyor. 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 for downstream treatment.

Key features and benefits

  • Controlled air cooling of IBA without water quenching

  • Fully encapsulated, dust-tight design to prevent dust emissions

  • Recovery of sensible heat into the combustion process

  • Delivery of dry bottom ash for advanced treatment

  • Improved recovery rates and quality of non-ferrous and precious metals

  • Enhanced processing of fine fractions

  • Dry mineral aggregates with higher value potential

  • Increased overall plant energy efficiency

  • Clean and safe working environment

  • No quench water and no contaminated wastewater streams

  • Reduced corrosion and lower lifecycle operating costs

  • Stronger environmental and sustainability performance

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Further related technologies

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Thermal waste treatment produces residues which can be either reused or landfilled. The principal components are slags and ashes, consisting mostly of non-combustible waste constituents such as glass, minerals or scrap metals.

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