Applications
Keppel Seghers' fluidised beds have proven to be an innovative solution for the efficient and complete combustion of
- mechanically dewatered sludge from wastewater treatment plants
- dried sludge
- sludge pellets
All types of low-caloric biosolids and sludges (up to 6 MJ/kg) can be incinerated in the ZEROFUEL®.
Advantages
- Easy and highly flexible operation
- High availability (>90%)
- Long lifetime of installations
- Advanced automated process control system
- Very low process emissions (CO, NOx)
- Staged combustion: secondary air injection optimised by CFD simulations
- Maximal volume and weight reduction of the waste with complete inertisation of the residues
- Efficient energy recovery by producing heat, steam or electricity
- Integrated flue gas cleaning
Description
The Keppel Seghers' fluidised bed combustion technology consists of a turbulent fluidized bed furnace with heat recovery. The proprietary air distribution system combined with a shallow bed ensures homogeneous, stable fluidisation at a wide range of operating conditions. The use of a shallow bed avoids formation of hot and cold spots, and prevents the occurrence of dead zones.
The ZEROFUEL® fluidized bed features an efficient internal energy recovery system, allowing for auto-thermal combustion of low-calorific sludge, i.e. the combustion air is pre-heated up to 650°C by internal heat recovery, resulting in a drastic reduction of the consumption of auxiliary fuel. In addition, the size of the furnace is significantly smaller than in conventional fluidised bed systems, and an innovative feed system distributes the sludge in small particles evenly across the entire surface of the bed.
The ZEROFUEL® sludge incineration process fulfils the three conditions (the 3 "T"s) to reach a perfect combustion:
- optimum temperature of 850°C,
- long residence time (> 2 s) and
- maximum turbulence.
The staged and controlled combustion process guarantees low CO and NOx emissions, and allows for operation at low excess oxygen levels.
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