WASTE TO ENERGY
dischargers, bunkers and its patented Toploader storage system, for receiving the material depending on the way it is discharged. Tese are filled, for example, from the open side by semi-trailers, tilting containers or wheel loaders on a flat floor surface. Discharging to the subsequent conveyor equipment takes place on the opposite side via an inclined ramp. In most cases, the fuel is transported in
sizes P63 or P100. Te maximum length of the particles is therefore less than 200 or 250mm. Foreign bodies, such as metals and minerals, must be removed to obtain a homogenous mass. For this purpose, Vecoplan installs magnets in the lines to remove ferrous metals such as screws and nails from the mass. Depending on the material, non-ferrous separators are also incorporated into the line. “For example, a high aluminium content can significantly impair the combustion process,” explains Rosenkranz. Disc or star
screening machines are used to separate over-length wooden slats from the biomass. Te excess lengths removed go directly to slow-running single or double shaft shredders from the VAZ or VNZ ranges. Tese work particularly energy efficiently. Te processed biomass is usually
transported by open trough belt or closed drag chain conveyors. “In the case of drag chain conveyors, an endless chain with dogs runs in a closed trough. Depending on the type of dog and trough, they can move the material horizontally, on an incline or vertically. For storage, Vecoplan supplies different systems, such as pull rod dischargers, loading and unloading conveyors, top loaders, concrete silos or open-air storage, to suit the volumes transported. “We size all components of the process line according to the charging cycles and the fuel requirement,” says Rosenkranz.
INDIVIDUALLY MATCHED TECHNOLOGY
Burmeister & Wain Scandinavian Contractor also has faith in these systems. Te Danish firm tasked Vecoplan with designing an individual charging and processing system for new and mature timber at five locations in the UK. “We carried out the engineering, supplied the machines and the electrical controls, took responsibility for the steelwork and installation and subsequently trained the staff,” explains Rosenkranz. As well as high availability, technical
safety presented a particular challenge. One of the sites is in Snetterton in the English county of Norfolk. Vecoplan incorporated pendulum rod dischargers to be able to tip the already shredded material safely. Te suspended rods enable bulk and free-flowing material with a maximum grain size of 40mm to
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