CARBONATES in lamprophyres have various occurrences. The source of CO<sub>2</sub> in lamprophyres provides animportant clue for us to understand the relationship between lamprophyres and gold mineralizatio...CARBONATES in lamprophyres have various occurrences. The source of CO<sub>2</sub> in lamprophyres provides animportant clue for us to understand the relationship between lamprophyres and gold mineralization.Demeny et al.determined the C and O isotopic composition of various carbonates from Mesozoic lamprophyres in Transdanubian Range of Hungary, and suggested that the carbonates with different occurrences were different in origin. That is to say, the CO<sub>2</sub> in lamprophyres has various sources. TheLaowangzhai gold deposits, Yunnan Province, China, is a typical orefield where lamprophyres are temporally and spatially related to gold mineralization. The CO<sub>2</sub> contents of relatively fresh lampropyres from theorefield （the range of content is 5.10%-9.56%, averaging 7.45% ） are obviously higher than that ofprimary lamprophyres （about 0.5%）. Huang et al.considered that the CO<sub>2</sub> in relatively fresh lam-展开更多
减少碳排放并推动碳中和是应对气候变化、促进经济社会绿色转型的重要途径之一,碳中和技术已成为工业界和学术界的关注焦点。目前碳捕集与封存主要对工业固定源排放的CO_(2)进行处置捕集,而对占CO_(2)总排放近50%的分布源CO_(2)关注度...减少碳排放并推动碳中和是应对气候变化、促进经济社会绿色转型的重要途径之一,碳中和技术已成为工业界和学术界的关注焦点。目前碳捕集与封存主要对工业固定源排放的CO_(2)进行处置捕集,而对占CO_(2)总排放近50%的分布源CO_(2)关注度不高。直接空气捕集(direct air capture,DAC)技术不仅可对数以百万计的小型化石燃料燃烧装置以及数以亿计的交通工具等分布源排放的CO_(2)进行捕集处理,还可有效降低大气中CO_(2)浓度。介绍了DAC的发展历史、研究现状以及发展趋势,综述了已有DAC技术的工艺流程以及反应装置,对DAC现行工艺中涉及的空气捕捉模块、吸收剂或吸附剂再生模块、CO_(2)储存模块进行了叙述,对比了几种工艺的优缺点以及吸附剂类型和再生方式,指出DAC技术发展的关键在于研发高效低成本的吸收/吸附材料和设备。分析了DAC吸收/吸附材料的作用原理以及吸附效果,碱性溶液原料成本相对低廉,但再生过程中能耗较高。分子筛及金属有机框架吸附剂虽然再生能耗较低,但对空气中CO_(2)的吸附容量和吸附选择性表现一般。胺类吸附剂具有较好的吸附能力,由于其再生温度较低,可使用工业废热或少量热能为系统供能;使用胺类吸附剂时吸附和解吸在一个单元中逐步发生,具有更高的效率和操作时间,有望降低DAC系统成本。对比了DAC与其他碳捕集技术的成本并进行了技术经济性分析,DAC成本主要包含运营和维护成本(N_(Q&M))、吸附剂材料成本(N_(S))和工厂设备的净成本(N_(bop));指出目前限制DAC工业化应用的主要因素之一在于吸收/吸附材料和相关工艺成本过高,随着阴离子交换树脂等新型吸附剂的出现和工艺的发展,DAC成本逐年下降。全面探究吸收/吸附材料稳定性、动力学、吸附容量、选择性、再生能量损失等综合性能,研发利于快速装载和卸载吸附剂的相�展开更多
文摘CARBONATES in lamprophyres have various occurrences. The source of CO<sub>2</sub> in lamprophyres provides animportant clue for us to understand the relationship between lamprophyres and gold mineralization.Demeny et al.determined the C and O isotopic composition of various carbonates from Mesozoic lamprophyres in Transdanubian Range of Hungary, and suggested that the carbonates with different occurrences were different in origin. That is to say, the CO<sub>2</sub> in lamprophyres has various sources. TheLaowangzhai gold deposits, Yunnan Province, China, is a typical orefield where lamprophyres are temporally and spatially related to gold mineralization. The CO<sub>2</sub> contents of relatively fresh lampropyres from theorefield （the range of content is 5.10%-9.56%, averaging 7.45% ） are obviously higher than that ofprimary lamprophyres （about 0.5%）. Huang et al.considered that the CO<sub>2</sub> in relatively fresh lam-
文摘减少碳排放并推动碳中和是应对气候变化、促进经济社会绿色转型的重要途径之一,碳中和技术已成为工业界和学术界的关注焦点。目前碳捕集与封存主要对工业固定源排放的CO_(2)进行处置捕集,而对占CO_(2)总排放近50%的分布源CO_(2)关注度不高。直接空气捕集(direct air capture,DAC)技术不仅可对数以百万计的小型化石燃料燃烧装置以及数以亿计的交通工具等分布源排放的CO_(2)进行捕集处理,还可有效降低大气中CO_(2)浓度。介绍了DAC的发展历史、研究现状以及发展趋势,综述了已有DAC技术的工艺流程以及反应装置,对DAC现行工艺中涉及的空气捕捉模块、吸收剂或吸附剂再生模块、CO_(2)储存模块进行了叙述,对比了几种工艺的优缺点以及吸附剂类型和再生方式,指出DAC技术发展的关键在于研发高效低成本的吸收/吸附材料和设备。分析了DAC吸收/吸附材料的作用原理以及吸附效果,碱性溶液原料成本相对低廉,但再生过程中能耗较高。分子筛及金属有机框架吸附剂虽然再生能耗较低,但对空气中CO_(2)的吸附容量和吸附选择性表现一般。胺类吸附剂具有较好的吸附能力,由于其再生温度较低,可使用工业废热或少量热能为系统供能;使用胺类吸附剂时吸附和解吸在一个单元中逐步发生,具有更高的效率和操作时间,有望降低DAC系统成本。对比了DAC与其他碳捕集技术的成本并进行了技术经济性分析,DAC成本主要包含运营和维护成本(N_(Q&M))、吸附剂材料成本(N_(S))和工厂设备的净成本(N_(bop));指出目前限制DAC工业化应用的主要因素之一在于吸收/吸附材料和相关工艺成本过高,随着阴离子交换树脂等新型吸附剂的出现和工艺的发展,DAC成本逐年下降。全面探究吸收/吸附材料稳定性、动力学、吸附容量、选择性、再生能量损失等综合性能,研发利于快速装载和卸载吸附剂的相�
