考虑性能指标的水泥生命周期综合优化研究

Study on comprehensive optimization of cement life cycle considering performance index

水泥行业的碳排放约占全国的14.3%,对实现“双碳”目标具有重要影响。现有的水泥生命周期评价研究大多只考虑环境影响,本文提出综合考虑性能与环境的水泥生命周期评价方法。首先设计提出水泥生命周期环境影响评价方法,建立水泥生产的边界模型和物料清单,并选用CML2001方法对水泥生命周期的环境影响进行计算。结果表明,最主要的环境影响为全球变暖潜值,各阶段中熟料煅烧阶段对环境的影响最大。进一步,本文根据环境评价结果,在熟料煅烧阶段综合考虑二氧化碳分解量与三率值偏差值,构建出单位水泥产品性能与环境影响的多目标优化模型,并利用NSGA-Ⅱ算法进行仿真分析,以期为水泥生产提供理论指导,能够在保证水泥性能的同时,减小生产过程中的环境负荷。

The cement industry accounts for approximately 14.3%of the national carbon emissions,which has a significant impact on achieving the‘double carbon’target.Most of the existing studies on cement life cycle assessment only consider the environmental impact.In this paper,a comprehensive approach to evaluate the life cycle of cement is proposed,which takes into account the performance of the finished product and its environmental impact.First,the environmental impact assessment method of cement life cycle is designed and proposed,the boundary model and bill of materials for cement production are established,and the CML2001 method is used to calculate the environmental impact of cement life cycle.The results show that the main environmental impact is the global warming potential,and the impact of the clinker calcination stage on the environment is the greatest among all stages.Based on the results of the life cycle environmental assessment,a multi-objective optimization model of the performance and environmental impact of a unit cement product is constructed in the clinker calcination stage,which takes into account the deviation of the carbon dioxide decomposition and the three rate values,and uses the NSGA-II algorithm for simulation analysis.This model is intended to provide theoretical guidance for cement production and reduce the environmental load in the production process while maintaining good cement performance.