关键词: 硅莫砖, 碳足迹, 生命周期评价, 减碳路径

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