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gasification characteristics of combustible wastes were determined in a 5 ton/day fixed bed gasifier(1.2 m I.D. and 2.8 m high). The fixed bed gasifier consisted of air compresor, oxygen tank, MFC, fixed bed gasifier,cyclone, heat exchanger, solid/gas separator, water fluidized bed reactor and blower. To capture soot or unburned car-bon from the gasification reaction, solid/gas separator and water fluidized bed were used. The experiments with 10-50 hours of operation were carried out to determine the effects of bed temperature, solid/oxygen ratio and oxidant onan increase of bed temperature because combustion reaction happened more actively. The gas composition of partialoxidation of woodchip is CO: 34.4% , H2: 10.7% , CH4: 6.0% , CO2: 48.9% and that of RPF is CO: 33.9% , H2: 26.1% ,CH4: 10.7% , CO2: 29.2% 3, 2,863 kcal/Nm3,respectively. The maximum calorific values were 3,100 kcal/Nm3 at RPF/oxygen ratio: 7.
<P><B>Abstract</B></P> <P>In recent years, circulating fluidized bed combustor (CFBC) has been regarded as a viable alternative to the conventional pulverized coal combustor (PCC) for utility-scale coal power generation owing to its superior technology for fuel flexibility and supercritical (SC)/ultra supercritical (USC) steam circuit adaptability. The objective of this study is to analyze the economic feasibility of a 600MWe USC CFB boiler, in which coal or a mixture of coal and biomass would be used as fuel. After the demonstration and commercialization of SC CFBC units had succeeded up to 600MWe, USC CFBCs have been widely developed throughout the world. Although high capital costs, high auxiliary power use, and technology maturity have hindered the adoption of USC CFBC for utility power generation, the demand of cleaner environments and energy conversion have driven communities to develop and adopt USC CFBC. Its economic feasibility was evaluated in terms of net present value (NPV), benefit/cost ratio (B/C ratio), and internal rate of return (IRR). In particular, the effect of coal tax and domestic biomass co-combustion on economic efficiency was analyzed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The economic feasibility of 600MWe USC CFB power plant were investigated. </LI> <LI> The economic efficiency of biomass co-combustion could be higher than that of coal combustion due to carbon trade exchange. </LI> <LI> The 600MWe USC CFB power plant with biomass co-combustion could be feasible in spite of coal tax or carbon tax. </LI> </UL> </P>
Materials (Organic, Inorganic, Electronic, Thin Films), Polymer, Fluidization, Particle Technology : Statistical and Deterministic Chaos Analysis of Pressure Fluctuations in a Fluidized Bed of Polymer Powders
Lee,,See-Hoon,Heo,,Hyeon,Su,Jeong,,Kwang-Eun,Yim,,Jin-Heong,Jeon,,Jong-Ki,Jung,,Kyeong,Youl,Ko,,Young,Soo,Kim,,Seung-Soo,Park,,Young-Kwon American Scientific Publishers 2011 Journal of Nanoscience and Nanotechnology Vol.11 No.1
<P>The catalytic cracking of oilsand bitumen was performed over nanoporous materials at atmospheric conditions. The yield of gas increased with application of nanoporous catalysts, with the catalytic conversion to gas highest for Meso-MFI. The cracking activity seemed to correlate with pore size rather than weak acidity or surface area.</P>