Thermoneutral Coproduction of Calcium Oxide and Syngas by Combined Decomposition of Calcium Carbonate and Partial Oxidation/CO2-Reforming of Methane

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• 作者：M. Halmann and A. Steinfeld
• 刊名：Energy & Fuels
• 出版年：2003
• 出版时间：May 2003
• 年：2003
• 卷：17
• 期：3
• 页码：774 - 778
• 全文大小：78K
• 年卷期：v.17,no.3(May 2003)
• ISSN：1520-5029

文摘

The calcination of limestone to produce lime and cement is characterized by its high-energyconsumption and concomitant CO₂ emissions to the atmosphere. By combining the calcinationreaction with the partial oxidation and CO₂-reforming of methane, an overall thermo-neutralprocess can be designed, with high-quality syngas as a useful byproduct, and a substantialdecrease in CO₂ release. The thermochemical boundary conditions for such a combined processare established. The thermodynamics are also examined with coal instead of methane as thefuel and carbon source. Adding H₂O in the reaction mixture results in the coproduction of CaOand syngas with a H₂/CO molar ratio of 2, suitable for methanol synthesis. A preliminary economicanalysis indicates favorable competitiveness, even before the application of credit for CO₂avoidance. The fuel saving of the proposed coproduction vs the separate production may amountup to 70%, and the avoidance of CO₂ emissions may reach 74%.