An Improved Thermodynamic FactSage Simulation to Simulate Mineral Matter Transformation during a Fixed Bed Counter- current Gasification Process, Validated with HT-XRD
In a previous study by Van Dyk, et al., (2006) and Van Dyk et al. (2006), a FactSage model was developed to understand the chemistry and interpret mineral matter transformation during a fixed bed counter-current gasification process. It was concluded that the FactSage model developed,compared with HT-XRD experimental results and that the FactSage thermodynamic modeling supplies insight into specific mineral reactions and slag formation. The specific value for Sasoi in using FactSage, in combination with HT-XRD is that it can be used to analyze equilibrium conditions for reactions occurring between inorganic and organic materials together, as well as to provide insight into mineral transformation and slag formation. The purpose of the present study was to improve the current FactSage modeling approach, by combining specific zones in the gasification process. This can improve and speed-up the interpretation of mineral matter transformations and flow properties of reacted mineral matter in coal and assist in identifying and quantifying slag formation in the gasifier operation at temperatures not reflected by normal AFt analyses.The updated and improved FactSage model compared favorably with the original model as well as with HT-XRD results and thus will be able to supply results in a faster and more convenient manner. In the new FactSage model, supported by HT-XRD experimental findings, it is indicated that feldspar formation (including anorthite) correlated with slag formation at temperatures around 1000℃ and no slag formation in the base case coal was observed in the drying and devolitilization zone, as was to be expected. Feldspar is one is the mineral species which has the lowest AFT causing the most slag-liquid formation and forms probably as a product between the SiO2, Al2O3 and Ca-containing species. In the gasification zone it was clear that slag-liquid formed at a temperature of 1000℃, with a decrease in the feldspar content. Mullite formation was also observed in the base case sample in the temperature range 1000℃ and 1100℃. The decrease in the amount of SiO2 at 1100℃ is related to the formation of mullite, but also that the slag-liquid phase also contains an amount of SiO2 in the molten form.
Gasification Thermo-equilibrium modeling Mineral matter transformations
J.C. van Dyk F.B. Waanders
Sasol Technology, R&D Division, Syngas and Coal Technologies, South Africa School of Chemical and Minerals Engineering, North West-University, South Africa
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
2314-2321
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）