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What is biomass about?
Biomass is a category of renewable energy that generally is a much more environmentally friendly, sustainable source of energy, compared to conventional sources. Bioenergies have always provided social benefits such as reduced dependence of foreign energy, reduced pollution, and support of your local economy. Due to the past few years of increasing and extremely volatile energy markets, many are looking for cost saving alternatives, and are turning to conservation, bioenergies, or both. Most forms of bioenergy have stable prices. As a generality, biomass for heat will cost cheaper than the 5-year average for natural gas. Biomass for other energy needs have too large of a range, specific to your situation, to give a rule of thumb.
Biomass feedstocks (the carbon-based material that comprises biomass) are typically low value, high bulk density carbon-based materials. There are thousands of different feedstocks, with the two most abundant being agricultural residues/crops and forestry resources. The feedstock(s) that should be chosen need to meet your needs and be available in the quantities required, all at an acceptable price. Most of the feedstocks, due to their nature, can offer stable prices, as compared to a conventional energy market ridden with extreme volatility.
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What can biomass be used for?
Today, biomass is primarily used for heat and/or electrical generation. Biomass can be economically superior, in most cases, to propane or natural gas for use in heat and in combined heat and power applications. It is also competitive in an increasing number of coal boilers as well, however this varies by situation. Tomorrow, biomass will be used, we believe, for heat, power, a significant portion of transportation fuels, and some replacements for petroleum based products (i.e. bio-plastics, bio-fiberglass).
Biomass consists of three main components: a feedstock, a conversion process, and an intermediate or final product. The feedstocks can be from hundreds of organic materials. A few are corn stover, wood, switchgrass, miscanthus, and paper. There are numerous conversion processes and hundreds more variation thereof that lead to an equal number of end products. The major conversion processes are: processing and densification, gasification, reforming via catalysts, pressing/chemical extraction, fermentation, and microbial processing. Processing and densification is the aggregation, processing, compressing, and shaping of biomass feedstocks to make a high bulk density product that meets the needs of the next conversion process or for final use, such as fuel for heat and/or power. Gasification is the thermal processing of feedstocks into syngas, a gas that can be burned for heat and/or power or it can be further processed into synthetic oil products. Reforming via catalysts can take a few inputs, most frequently sugar or syngas, and reform the molecules into synthetic petroleum products. Pressing/chemical extraction is the separation of oil from the feedstock, for use as petroleum products. Fermentation is the use of microbes to turn sugars into alcohol (ethanol), for use in transportation fuels. Microbial processing is similar to fermentation, however the end product is not alcohol.
All of these feedstocks and conversion processes require widely ranging capital and operating expenses, as well as minimal to high risk systems. It is critical to do a thorough analysis of systems being considered to make the best decision possible.
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