Beyond 90% capture: Possible, but at what cost?
Beyond 90% capture: Possible, but at what cost?
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DOI：
10.1016/j.ijggc.2020.103239
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发表时间：
2021-01-09
影响因子：
3.9
通讯作者：
Dowell, Niall Mac
中科院分区：
文献类型：
--
作者：
Brandl, Patrick;Bui, Mai;Dowell, Niall Mac
碳捕获和封存(CCS)将在实现我们的气候变化缓解目标方面发挥重要作用。CCS技术在技术上已经成熟，可能会被部署在电力、工业、热能和大气中二氧化碳的脱碳方面。90%的二氧化碳捕获率的假设在文献中已经变得无处不在，这使得人们怀疑超过90%的二氧化碳捕获率是否可行。然而，在1.5摄氏度的目标背景下，超过90%的捕获将是至关重要的，剩余排放需要通过二氧化碳去除(CDR)技术间接捕获。虽然在二氧化碳捕获率增加的成本和补偿成本之间会有权衡，但了解这一点是将对CDR的依赖降至最低的关键。这项研究量化了一系列动力和工业二氧化碳来源的可行二氧化碳捕获率的最大限制，超过这一限制，减排就变得不经济。在任何情况下，90%的捕获率都不是最佳的，在相对较低的边际成本下，捕获率可能高达98%。研究发现，烟气成分是捕集成本的关键决定因素，稀释程度越高，捕集成本越低。还评估了通过部署互补性CDR进行的间接捕获。结果表明，目前的政策举措不太可能足以使CCS在经济上可行地部署在经济上可行的所有经济部门中，除了极少数的利基部门。
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 degrees 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.