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Rate-RatioAsymptoticAnalysisoftheStructureand…:率的渐近分析与结构….doc
5th US Combustion Meeting
Organized by the Western States Section of the Combustion Institute and Hosted by the University of California at San Diego
March 25-28, 2007.
Modeling Multicomponent Solid-Liquid Phase Equilibrium of Salts and Silicates in Biomass and Coal Thermal Conversion Processes
Bing Liu1, John L. Oscarson1, Larry L. Baxter1, and Reed M. Izatt2
1Department of Chemical Engineering, Brigham Young University, Provo,Utah 84602, USA
2Department of Chemistry and Biochemistry, Brigham Young University, Provo,Utah 84602, USA
A knowledge of the solid-liquid phase equilibrium of salts and silicates is important to understand ash deposition and slagging problems in biomas and coal thermal processing equipment. Computer codes simulating combustion/gasification processes require a good thermodynamic subprogram to describe the effect of slagging on the process. While ash deposits are generally not in equilibrium, thermochemical equilibrium represents the endpoint of their reaction and differences between current conditions and equilibrium conditions affect both chemical and physical (sintering, melting, vaporization) reaction rates. In the present work, a modified quasichemical model correlates the equilibrium phase diagrams of binary and ternary systems of significance to black liquor, biomass, and coal conversion equipment. Examples of NaCl-Na2CO3, Na2S-K2S, K2O-SiO2, and FeO-SiO2 systems validate the model and phase equilibrium algorithm by comparison with literature data. The model is discussed and a comparison of the model predictions and data is given.
Introduction
Biomass and coal thermal conversion equipment (combustors, gasifiers, pyrolyzers, etc.) represent the primary technologies based on ash-forming fuels for power generation. These technologies convert fuel, air/oxygen, and steam to lighter molecules such as water, carbon dioxide, hydrogen, carbon monoxide, and various pollutants. Depending on the technology and fuel, the systems typically operate
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