WASTE TO ENERGY
Disc screening machines are used to separate over-length wooden slats from the biomass
therefore used twice: once for producing electricity, and once for recovering heat. In Germany in 2016, around 13% of all electrical energy was obtained from renewable sources such as this, and also from wind, water and solar power. Just less than 80% was obtained from fossil fuels such as oil, gas and coal, and approximately 7% from nuclear power. “Renewable energies are becoming
ever more important for coping with the increasing demand for electricity worldwide. Oil is coming to an end and is also more expensive, the combustion of coal gives rise to greenhouse gases, and nuclear waste is diffi cult to dispose of,” says Ralf Rosenkranz from Vecoplan, citing three examples. However, availability plays a major role when it comes to regenerative energy sources. Wind and water power cannot be used everywhere, and solar energy is highly dependent on the sun’s radiation. T e importance of biogenic fuels for generating electricity reliably
and continuously therefore increases further, as mature timber in particular is available in suffi cient quantities in the short-, medium- and long-term. T e main markets for BMCHP are currently still to be found in Europe – but Africa, the USA and Asia are on the way up.
EFFICIENT PROCESSING BEFORE COMBUSTION Demands on power stations that have to provide an increasing amount of electrical energy are therefore escalating. T ey must work reliably, effi ciently and safely, often around the clock and seven days a week. For smooth and economic combustion, the biogenic solids must fi rst be homogenised, that is to say mechanically processed before combustion. “For example, the charging material may have a very high water content. Also, there are often foreign materials such as nails that contain iron, or leftover wood with over-long pieces in the mass. T ese can damage the machines and disrupt the combustion process,” explains
Rosenkranz. Vecoplan develops the necessary systems and components to prevent this. T e machine builder’s tasks also include services such as planning, consultation, overall project management, and comprehensive service as well as installation, commissioning and maintenance work. T is enables the company to adapt its technology to the particular application. “Biomass power plants are usually designed for long- term operation,” reports Rosenkranz. “T e fuel that is to be used is exactly defi ned for every plant.” Although the type of material is known, its source and therefore its quality may vary, particularly when transport service providers do not always deliver the biomass from the same suppliers.
FREE FROM EXTRANEOUS MATERIAL When the pre-shredded biomass arrives at the BMCHP, Vecoplan provides various components, such as pull rod
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