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'Tabletizer' compacts biomass materialThe use of biomass as an alternative energy source has grown rapidly. But most biomass materials such as switchgrass or corn are bulky and therefore costly to handle, store and transport. The University of Missouri and Columbia-based Ecologic Tech are developing an innovative "tabletizer" machine to mass-produce dense biomass tablets of various sizes at a low cost. The machine will be demonstrated June 17 as part of a field day program at the MU Bradford Research and Extension Center, where a prototype is being tested. "The goal is to test and develop a special machine that can press biomass materials into dense tablets without having to use heat or binder," said Jesse VanEngelenhoven, Ecologic Tech research director. "The machine is designed to reduce the overall cost of utilizing biomass for liquefaction, gasification and heat generation." The machine roughly resembles a large juice squeezer in which bulk quantities of switchgrass or corn stalks are pressed into tablets about 6 inches in diameter. If the prototype is successful, a second phase of the project will be to construct a commercial-scale densifier, which VanEngelenhoven estimates could produce about 17,000 tons of biomass tablets a year. The tablets could provide fuel for co-firing with coal in stocker and fluidized-bed boilers for power generation, fuel for heating buildings and feedstock for producing charcoal. Primary markets would be power plants and ethanol plants. The key to producing the tablets is obtaining a "sweet spot" where the tablet is dense enough to hold together yet loose enough for air to enter when placed in a fire, VanEngelenhoven said. Ideally, biomass material could be bought from local farmers, turning the biomass waste into a usable energy source. "All the waste that farmers would normally throw away could be brought to a central processing center, compacted and then sold as a value-added product," he said. "This would open markets for local agricultural products," said Tim Reinbott, Bradford Farm superintendent. "With these bulk materials, transportation is expensive. You want something that is within a 25- to 30-mile radius to be economical. If you had a machine that could be mobile then you could condense the biomass on site." Reinbott said the machine would also help with testing the mixtures of grasses, legumes and forbs that researchers at Bradford are studying as an alternative to monocultures of biofuel crops.
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