为什么“直接空气捕集”（DAC）成本远高于点源捕集？
Why is direct air capture (DAC) far costlier than point-source capture?
电厂烟气CO2浓度可达10–15%，而空气仅约0.04%，DAC需处理巨量空气并克服极低分压差，能耗与设备巨大，故成本每吨数百美元，远高于点源。
Flue gas has 10–15% CO2 but air only ~0.04%; DAC must process huge air volumes against a tiny partial-pressure gap, with large energy and plant costs—hundreds of dollars per ton, far above point sources.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
G. Tyler Miller,《Living in the Environment》Cengage 多版
G. T. Miller, Living in the Environment, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL66394W：Living in the environment
#CCUS #DAC #成本
用CO2驱油（EOR）是“封存”还是“增产石油”？
Is CO2-enhanced oil recovery (EOR) 'storage' or 'more oil'?
两者兼有：注入CO2提高采收率并部分永久封存于储层，但增产的石油燃烧又会排放CO2。净气候效益取决于封存比例与替代效应，争议较大。
Both: injecting CO2 boosts recovery and permanently stores some in the reservoir, but the extra oil burned emits CO2. Net climate benefit depends on storage fraction and displacement effects—contested.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
G. Tyler Miller,《Living in the Environment》Cengage 多版
G. T. Miller, Living in the Environment, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL66394W：Living in the environment
#CCUS #EOR #权衡
CCUS 是什么，和单纯“碳捕集”有什么不同？
What is CCUS and how does it differ from mere carbon capture?
CCUS 是碳捕集、利用与封存：先捕集工业或电厂CO2，再将其封存到地下（驱油、咸水层）或转化为化学品、建材等利用。多了“利用U”和“封存S”环节。
CCUS is Carbon Capture, Utilization and Storage: capture CO2 from industry or power, then store it underground (EOR, saline aquifers) or convert it to chemicals, building materials, etc. It adds utilization and storage to capture alone.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
G. Tyler Miller,《Living in the Environment》Cengage 多版
G. T. Miller, Living in the Environment, Cengage Learning, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL66394W：Living in the environment
#CCUS #碳捕集 #封存