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Wood Can Become A New Energy Source: Scientists
Environmental organizations have raised concerns for decades about the environmental impact of the burning of fossil fuels - particularly coal - for energy.
The combustion of coal contributes to acid rain and air pollution, and has been connected with global warming.
During torrefaction, woodchips go through a machine - almost like an industrial-sized oven - to remove the moisture and toast the biomass.
The machine, called a torrefier, changes more than just the appearance of the woody biomass. The chips become physically and chemically altered - through heat in a low-oxygen environment - to make them drier and easier to crush.
The torrefied wood is lighter than the original woodchips but retains 80 percent of the original energy content in one-third the weight.
That makes them an ideal feedstock for electric power plants that traditionally use coal to generate energy for businesses and residential neighborhoods.
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