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Innovative waste processing and recycling

Turning waste into energy can be a profitable business, if done effectively. BMH Enviro’s multifunctional Tyrannosaurus waste crushers and waste processing and recycling systems offer an excellent solution for utilising waste.
BMH Technology Oy

Virtually any kind of waste can be converted into homogeneous fuel with a high calorific value – using either single- or multi-stage treatment – using BMH Enviro’s waste-to-fuel systems. These produce fuel by crushing waste into small particle size material and separating out recyclable ferrous and non-ferrous metals, sand, stone, ceramics, and biowaste for onward use.

The resulting fuel – known as refuse-derived fuel (RDF) or solid recovered fuel (SRF) – can be fired as such or cofired, to replace oil, coal, peat, wood, and other solid fuels in power boilers and cement kilns.

The Tyrannosaurus 9905T crusher is capable of processing 3,000 used tyres an hour in a single pass. Like all BMH Enviro’s waste-to-fuel systems, the unit features robust construction, high capacity, and low operating costs.

Cement producers represent a major market for this type of fuel – and to meet their needs for small-size fuel (10-30 mm diameter) based on processed commercial and industrial waste in their main burners, BMH Enviro has introduced the Monster crusher. Equipped with a long, large-diameter rotor and a 500 kW motor, the Monster is the world’s largest fine crusher.

Making more of tyres

While cement producers’ main burners require very small particle size, their precalciners can use larger material, such as chipped tyres. Unfortunately, traditional crushers or shears are not every effective in dealing with tyres, as they suffer from low capacity, are incapable of producing optimum particle size, have high wear costs, cannot handle large tyres, have limited feed systems, and can suffer serious damage from entrapped metals.

BMH Enviro’s Tyrannosaurus crusher overcomes these issues, and is capable of automatically processing 3,000 tyres an hour into 50 - 60 mm chips in a single pass. Bulk feeding is also possible, via a front loader. The process is also unaffected by entrapped metal and occasional rims.

Solid savings and low emissions

With a typical heating value of 14 - 18 MJ/kg compared to approx. 41 MJ/kg for oil, 2.3 – 2.9 tonnes of low-cost, waste-derived fuel can replace a tonne of fuel oil very cost-effectively.

Tyre chips produced by the Tyrannosaurus.
If sufficiently homogeneous, waste-derived fuel ensures that boilers operate well and that combustion takes place at a sufficiently high temperature to ensure good environmental performance. Fuel of this type is particularly valuable for cement kilns, which have a large energy need and operate at high combustion temperatures.

Better preparation of refuse or municipal solid waste (MSW) is also worth serious consideration when combustion takes place in traditional grate incinerators, as the cost of preparing waste is marginal in comparison to the benefits it offers.

> Rainer Rehn
(Published in HighTech Finland 2008)