Residue Treatment
Wet bottom ash discharge and conveying

Robust operation. Proven concepts. Cost-efficient implementation.

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Introduction

Wet bottom ash discharge systems safely remove, cool, and convey bottom ash using water quenching. Cooling and effective sealing against false air support stable combustion conditions and reliable plant operation. Kanadevia Inova provides both ram-type and apron-type extraction systems.

Extraction systems

Ram-type wet-bottom ash extractor

A hydraulically driven ram intermittently discharges quenched ash from a water-filled hopper. This compact, mechanically straightforward design provides effective cooling and reliable furnace sealing and is highly tolerant of coarse ash. Bottom ash is discharged with an approximate water content of 15%, suitable for conventional downstream IBA treatment.

Apron-type wet-bottom ash extractor

Bottom ash is continuously discharged into a water-filled quench bath beneath the furnace grate. A robust steel apron conveyor slowly transports the quenched, dust-free ash out of the bath while excess water drains back into the system. This configuration ensures effective cooling, reliable false air sealing, and stable operations.

Key features and benefits

  • Rapid cooling through water quenching

  • Reliable furnace air sealing

  • Stable combustion conditions

  • Production of moist ash for conventional IBA treatment

  • Recovery of ferrous and non-ferrous metals

  • Mineral fraction suitable for regulated reuse after conditioning

  • Established quench water treatment and recirculation concepts

  • Proven and highly reliable technology

  • Simple operation with high tolerance to variable waste quality

  • Effective dust suppression through wet handling

  • Lower capital investment

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