IDENTIFYING ENVIRONMENTALLY PREFERABLE USES FOR BIOMASS

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IDENTIFYING ENVIRONMENTALLY PREFERABLE USES FOR BIOMASS ( identifying-environmentally-preferable-uses-for-biomass )

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BC Bugwood Envirochem Services Inc. breaks down the hemicellulose that holds the macro fibrils together, which allows for easier grinding and decreases the amount of energy required to process the feedstock. The heat energy requirement for torrefaction could be supplied by the waste bark and would represent approximately 25% of the bark, or less than 0.5 GJ. With this process, it may be possible to integrate torrefaction and grinding into a mobile unit, which could make decentralised entrained gasification possible in either a large mobile unit or a transportable processing plant. Figure 4.6.3 Simplified Representation of the Torrefaction Process 4.6.3 The Gasification Process Gasification for Conversion to Methanol: The purpose of the gasifier is to decompose the biomass into a gaseous form. The ultimate goal is to create a gasifier that can convert a solid biomass material to a syngas with high energy content: H2, CO and CH4. Significant research has already been invested and is continually being put into gasifier research. The best way to classify the many existing gasifier configurations is to separate them into three main types, i.e. fluidized bed, entrained flow and fixed bed gasifiers. These categories can be further split into direct or indirect / co-current or cross-current. For large-scale operations, only the first two are considered feasible since fixed bed gasifiers are impractical for high biomass throughputs. For mobile production, all three are possible choices since throughput will be small. The size and complexity of the gasification equipment dictates the ease and feasibility of being able to take what is commonly stationary equipment and producing either mobile or transportable equipment. The complexity of the gasification equipment varies greatly, from the simplest being a fixed bed direct gasifier to a more complicated entrained or indirect fluidized bed gasifier. Page 61

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