Combustion mechanisms in wood fired boilers Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/dn39x443j

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  • A program of research has been established at Oregon State University to study wood residue combustion using an experimental spreader-stoker combustor. This research was conducted to increase the understanding of combustion occurring in wood fired boilers. Using Douglas Fir screened to 3/8-3/4 inches, two 4x4 factorial experiments were conducted varying depth of fuel bed and fuel feed rate. The objective of the experiments was to test the hypotheses that increased fuel bed depth has the statistically significant effects of decreasing particulate emissions and increasing the relative amount of solid carbon oxidized by the underfire air (the Relative Carbon Saturation). The amount of carbon is relative to the maximum amount that could be oxidized by the air. The results of the experiments were that the following effects were found to be statistically significant. 1. Increasing fuel bed depth from two to four inches decreases particulate emissions. 2. The effect of bed depth on particulate emissions is more pronounced at higher combustion rates. 3. Increasing fuel bed depth from two to four inches increases the Relative Carbon Saturation of the gases produced in the fuel bed. 4. At either fuel bed depth, the Relative Carbon Saturation is decreased by higher combustion rates. The most important results of the research are that a fuel bed several inches thick in a wood fired spreader-stoker can be used to effectively meter the underfire air to reduce particulate emissions and increase the heating value of the gases produced in the fuel bed which become fuel for the overfire combustion. New concepts of combustion mechanisms in wood fired boilers are presented in the thesis and recommendations for further research are offered.
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