Energy, National Energy Technology Laboratory is performing a feasibility analysis on installing a state-of-the-art circulating fluidized bed boiler and ceramic filter emission control device at Penn State's University Park campus for cofiring multiple biofuels and other wastes with coal or coal refuse, and developing a test program to evaluate cofiring multiple biofuels and coal-based feedstocks. The objective of the project is being accomplished using a team that includes personnel from Penn State's Energy Institute and the Office of Physical Plant, Foster Wheeler Energy Corporation, Foster Wheeler Development Corporation, and Cofiring Alternatives.The major emphasis of work during this reporting period was to assess the quantity and location of potential woodwaste feedstocks from the surrounding region and continue sample analyses. iv
The Pennsylvania State University is performing a feasibility analysis on installing a circulating fluidized bed (CFB) boiler at Penn State's University Park campus for cofiring multiple biofuels and other wastes with coal. Twenty feedstocks are being considered. Chemical fractionation analysis was performed on eleven of the fuels. It is the objective of this paper to present the results of characterizing selected biomass fuels via chemical fractionation. The chemical analysis of the fuels is then used to determine the net ash composition of possible fuel blends and their propensity to form liquid phases during combustion based on thermodynamic modeling. The FactSage equilibrium calculations suggest that a cofire of biofuels with an appropriate nonfouling coal should not pose any problems in a CFB system given that the coal makes up a majority of the thermal input. FactSage consistently predicted K 2 Si 4 O 9 (l) to be present at 1171K with biofuels having low aluminum levels and significant concentration of alkali earth elements. Only 10% of K 2 O present in a system was enough to result in the formation of K 2 Si 4 O 9 (l) at equilibrium that could compromise a CFB system.
A 2.25 sq ft (0.21 sq m) atmospheric fluidized bed combustor (AFBC), using Illinois No. 6 coal and Quincy limestone is being used to test the in-bed corrosion resistance of selected austenitic alloys with a maximum metal temperature of 870 C (1600 F). This paper describes the combustor test facility, test parameters, materials selection and summarizes the results after 1500 hr of testing.
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