Abstract: Accounting the carbon footprint of silicon carbide-mullite bricks,which support the high-quality development of the cement industry,is of great significance to promote the low-carbon development of refractory production enterprises,and help the energy conservation and emission reduction,and low-carbon transformation of downstream cement enterprises.Taking a typical enterprise as an example,based on the life cycle assessment method,a life cycle assessment model for silicon carbide-mullite bricks through Simapro 9.5 software was built,the carbon footprint of silicon carbide-mullite bricks “from cradle to gate” was quantified,and a carbon reduction path for silicon carbide-mullite bricks was proposed.The results show that the carbon footprint of producing 1 ton silicon carbide-mullite bricks is 1 795.14 kgCO_2eq,of which the raw material and fuel acquisition stage and the production stage contribute 89.7% and 10.3%,respectively to greenhouse gas emissions within the system boundary.The main sources of greenhouse gas are the upstream silicon carbide production process,the high-temperature sintering process of bauxite (clinker),and silicon carbide-mullite bricks production.The carbon footprint of silicon carbide-mullite bricks can be effectively reduced by developing highly active silicon carbide production catalysts,increasing the proportion of green electricity application,minimizing the use of raw materials with high carbon emissions,and vigorously promoting the fuel substitution and application of oxygen-rich combustion technology.

Key words: silicon carbide-mullite bricks, carbon footprint, life cycle assessment, carbon reduction path

摘要： 核算支撑水泥行业高质量发展的硅莫砖的碳足迹对于推动耐火材料生产企业低碳发展,助力下游水泥企业的节能减排和低碳转型具有重要意义。本工作中以某典型企业为例,依据生命周期评价方法,通过 Simapro 9.5软件搭建了针对硅莫砖的生命周期评价模型,量化了硅莫砖“从摇篮到大门”的碳足迹,并提出了硅莫砖的减碳路径。结果表明:生产1 t硅莫砖的碳足迹为1 795.14 kgCO₂eq,其中原燃材料获取阶段、产品生产阶段对系统边界内温室气体排放的贡献分别为89.7%、10.3%。温室气体排放的主要来源是上游碳化硅生产环节以及铝矾土(熟料)和硅莫砖生产的高温烧成工序。基于硅莫砖各阶段的碳排放特点提出:通过研发高活性碳化硅生产催化剂,提升绿电应用比例,最大限度降低高碳排放原材料使用比例,大力推进燃料替代和富氧燃烧技术的应用等途径可以有效降低硅莫砖的碳足迹。

关键词: 硅莫砖, 碳足迹, 生命周期评价, 减碳路径