零碳燃料替代和CO2捕集在水泥厂脱碳过程中可以发挥重要作用。提出了一种将钙循环工艺与化学链制氢工艺(CaL-CLHG)相结合的集成方案,并评估了该方案用于水泥生产过程脱碳时的系统性能。CaL-CLHG方案的优势在于可回收水泥生产过程中的余热用于制氢,同时还避免了传统钙循环捕集工艺(CaL-Oxy)中用于空气分离的能耗。研究结果表明通过避免空气分离过程的电力消耗和利用余热回收制氢实现了水泥生产过程脱碳的热力学性能和经济性提升。在CaL-CLHG方案中,避免单位CO2排放的一次能源消耗可降低到2.68GJ/t,相比传统CaL-Oxy捕集工艺下降33.5%。经济性分析表明,CO2减排成本可从CaL-Oxy方案中的56.6$/t降至CaL-CLHG方案中的34.2~41.6$/t。采用CaL-CLHG工艺对现有水泥厂进行脱碳是一种技术经济上可行的选择。

Zero-carbon fuel substitution and CO2 capture will play a crucial role in the decarbonization of cement plants. This paperproposes an integration scheme that combines the calcium looping process with the chemical looping hydrogen generation process (CaL-CLHG). The CaL-CLHG scheme offers the advantage of recovering waste heat from the cement production process for hydrogengeneration. Besides, the CaL-CLHG scheme avoids the power consumption associated with air separation in the traditional calciumlooping process (CaL-Oxy). Results indicate that the specific primary energy consumption for CO2 avoided can be achieved at 2.68 GJ/tin the CaL-CLHG scheme. This represents a reduction of 33.5% compared to the CaL-Oxy scheme. Economic analysis indicates that thecost of CO2 avoided can be reduced from 56.6 $/t in the CaL-Oxy scheme to the range of 34.2-41.6 $/t in the CaL-CLHG scheme. Inconclusion,adopting the CaL-CLHG process for the decarbonization of existing cement plants presents a techno-economically feasibleoption.