Influence of Temperature on the Release of Inorganic Species from Victorian Brown Coals and German Lignites under CO2 Gasification Conditions

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• 作者：Joanne Tanner ; Marc Bl盲sing ; Michael M眉ller ; Sankar Bhattacharya
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：October 16, 2014
• 年：2014
• 卷：28
• 期：10
• 页码：6289-6298
• 全文大小：563K
• ISSN：1520-5029

文摘

The release of volatile inorganic species containing Na, K, S, and Cl during coal gasification is of interest due to the known associated issues related to corrosion and fouling in coal-to-product processes. Therefore, laboratory-scale experiments using two Victorian brown coals and four German lignites were performed at 1100, 1200, and 1400 掳C under an atmosphere of 20% CO₂ in He to simulate gasification conditions. The reaction products were analyzed online by the well-established molecular beam mass spectrometry technique, and qualitative and semiquantitative analysis of the results was performed. The primary release occurred during the initial devolatilization phase, with less volatile and secondary products released during the gasification phase. The main inorganic species detected were ³⁴H₂S⁺, ³⁵Cl⁺, ³⁶HCl⁺, ³⁹K⁺/³⁹NaO⁺, ⁵⁸NaCl⁺, ⁶⁰COS⁺/⁶⁰NaCl⁺, and ⁶⁴SO₂⁺. The release of sodium and chlorine species was highly dependent on temperature and the inherent Al and Si content of the coals. The release of sulfur-containing species was highly dependent on temperature and the inherent Ca content of the coals. Mechanisms for the initial release and subsequent reaction of intermediate inorganic species are offered herein to explain the observed trends with temperature and coal properties.