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Beyond 90% capture: Possible, but at what cost?
International Journal of Greenhouse Gas Control ( IF 3.9 ) Pub Date : 2021-01-09 , DOI: 10.1016/j.ijggc.2020.103239
Patrick Brandl , Mai Bui , Jason P. Hallett , Niall Mac Dowell

Carbon capture and storage (CCS) will have an essential role in meeting our climate change mitigation targets. CCS technologies are technically mature and will likely be deployed to decarbonise power, industry, heat, and removal of CO2 from the atmosphere. The assumption of a 90% CO2 capture rate has become ubiquitous in the literature, which has led to doubt around whether CO2 capture rates above 90% are even feasible. However, in the context of a 1.5 °C target, going beyond 90% capture will be vital, with residual emissions needing to be indirectly captured via carbon dioxide removal (CDR) technologies. Whilst there will be trade-offs between the cost of increased rates of CO2 capture, and the cost of offsets, understanding where this lies is key to minimising the dependence on CDR. This study quantifies the maximum limit of feasible CO2 capture rate for a range of power and industrial sources of CO2, beyond which abatement becomes uneconomical. In no case, was a capture rate of 90% found to be optimal, with capture rates of up to 98% possible at a relatively low marginal cost. Flue gas composition was found to be a key determinant of the cost of capture, with more dilute streams exhibiting a more pronounced minimum. Indirect capture by deploying complementary CDR is also assessed. The results show that current policy initiatives are unlikely to be sufficient to enable the economically viable deployment of CCS in all but a very few niche sectors of the economy.



中文翻译:

超过90%的捕获率:可能,但是要付出什么代价?

碳捕集与封存(CCS)在实现我们的减缓气候变化目标方面将发挥至关重要的作用。CCS技术在技术上已经很成熟,很可能会被用来对电力,工业,热能和从大气中去除CO 2进行脱碳。在文献中普遍存在90%CO 2捕集率的假设,这引起了人们质疑90%以上的CO 2捕集率是否甚至可行。但是,在目标温度为1.5°C的情况下,超过90%的捕集率至关重要,因为剩余排放需要通过二氧化碳去除(CDR)技术间接捕集。尽管在增加CO 2速率的成本之间会有所取舍捕获和补偿成本,了解这一点在哪里是最小化对CDR依赖性的关键。这项研究对一系列电力和工业来源的CO 2量化了可行的CO 2捕集率的最大极限,否则减排将变得不经济。在任何情况下,都没有发现90%的捕获率是最佳的,而以相对较低的边际成本可以达到98%的捕获率。发现烟气成分是捕集成本的关键决定因素,更多的稀流显示出更明显的最小值。还评估了通过部署互补CDR进行的间接捕获。结果表明,当前的政策举措不太可能足以使CCS在经济中的少数几个利基行业中的所有地区实现经济可行的部署。

更新日期:2021-01-10
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