在混凝土材料中的CO2矿化全球脱碳潜力
Justin G Driver1, Ellina Bernard2,3, Piera Patrizio4
1Department of Chemical Engineering, Imperial College London, London SW7 2AZ, United Kingdom.
概括
二氧化碳矿化产品可以减少排放,但生命周期影响和经济意义重大. 使用废旧水泥糊提供了一种具有成本效益的脱碳化途径,超过了碳捕获和储存 (CCS).
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 二氧化碳矿化产品是为了减少排放而推广的.
- 索赔往往忽略了生命周期的影响,物质属性,供应和经济.
- 混凝土生产是二氧化碳排放的主要来源.
研究的目的:
- 为了量化CO2eq. 十种与混凝土相关的二氧化碳矿化产品的减排潜力.
- 评估生命周期影响,材料特性,供应和经济可行性的影响.
- 将二氧化碳矿化技术的成本效益与碳捕获和储存 (CCS) 的成本效益进行比较.
主要方法:
- 十种二氧化碳矿化技术的生命周期评估.
- 全球二氧化碳等值的量化. 减少排放的潜力.
- 经济分析比较矿产化产品与传统材料和CCS.
主要成果:
- 2020年,全球产生了3.9 Gt的可碳化材料,其中绝大多数是废弃的水泥糊 (1.4 Gt).
- 所有研究的技术都减少了生命周期CO2-eq. 在替换传统产品时排放的排放.
- 经济上可行的技术提供了0.39 Gt的CO2eq. 2020年的减排潜力受到废水泥供应的限制.
结论:
- 从废弃水泥糊中化二氧化碳的成本比CCS降低2-5倍.
- 目前,一些二氧化碳矿化技术比CCS更昂贵.
- 增强退役水泥的回收对于最大限度地减少混凝土中的二氧化碳至关重要.
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