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%.