[MSL 1397]

Case Study:

Garbage Waste Ash – London Waste, Edmonton, UK

IN BRIEF

London Waste is a solid Waste Incinerator Plant, which handles and incinerates 500,000 tonnes of trade and domestic refuse per year on a continuous 24-hour operation.

London Waste purchased a total of twenty MultiAshflo conveying systems (four per ESP) with each system collecting the precipitator ash from purpose built hoppers and conveying it to the existing Flue Gas Treatment residue silos. All of the MultiAshflo conveying systems are Teflon coated due to the corrosive and cohesive nature of the precipitator ash caused by the of absorption of moisture during the combustion process.

MATERIAL CHARACTERISTICS

Material             Precipitator Ash from

Garbage Incineration

Bulk Density      Aerated 400-900 kg/m3

Size                  63-125 Micron

Temperature      Up to 180°C (356°F)

Moisture            10%

Condition           Abrasive, Not Free Flowing

SYSTEM OBJECTIVES

1. Air consumption efficiency     

2. Reliable consistent conveying

3. Maintain low pipe and valve wear

4. Replace existing cross-linked screw conveyors

5. Virtually maintenance free equipment

SYSTEM PERFORMANCE

Transfer Capacity: 2 Mt/h total

Conveying Distance: 110m (360 ft.)

Reception Points: Two

Average Air Consumption: Total 12.0 Nm3/min (424scfm) for all twenty conveying systems

1. Maintenance was reduced dramatically to only occur during boiler outage.

2. System operation is continuous 24 hours/day with consistent conveying and complete customer satisfaction.

3. Very low pipe and bend wear for handling an abrasive material.

4. Energy usages kept to a minimum.

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