Analysis of Equilibrium-Based TSA Processes for Direct Capture of CO2 from Air
Analysis of Equilibrium-Based TSA Processes for Direct Capture of CO2 from Air
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DOI：
10.1021/ie300691c
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发表时间：
2012-06-27
影响因子：
4.2
通讯作者：
Sholl, David S.
中科院分区：
文献类型：
--
作者：
Kulkarni, Ambarish R.;Sholl, David S.
从空气中直接捕获CO2是一个概念，如果成功实施，可能导致从分散源捕获CO2。我们已经开发了过程模型来考虑基于吸附的空气捕获技术的可行性。我们的模型侧重于使用氨基改性的二氧化硅吸附剂，TRI-PE-MCM-41，和结构化的整体接触器单元。我们已经研究了几种不同的变温吸附工艺，使用CO2的纯度和年产品产量作为比较工艺性能的指标。该分析确定了一些操作参数、吸附剂特性和对工艺性能有显著影响的其他因素。使用该过程的总能量需求和可用的能源，如低压蒸汽和电力，我们进行了经济分析，以获得空气捕集CO2的净运营成本。我们确定了一个过程，每天的吞吐量类似于1.1吨二氧化碳在88.5%的纯度，使用标准的集装箱大小的空气捕获装置。所需的总能量（6745 MJ/t CO2）主要由接触器（40%）和吸附剂（28%）的寄生损失-显热需求决定，而不是由与空气流相关的机械能决定（类似于5%）。根据我们对电力来源、低压蒸汽可用性和地理位置等因素的分析，捕获的净运营成本估计为100美元/吨CO2。这些费用估计数不包括建造或维护空气捕获装置所需的资本支出。确定了进一步降低这些过程的能源和货币成本的潜在战略。我们的分析支持继续工作，以建立基于吸附的空气捕获的技术和经济可行性。
Direct capture of CO2 from air is a concept that, if successfully implemented, could lead to capture of CO2 from disperse sources. We have developed process models to consider the viability of adsorption-based air capture technologies. Our models focus on using an amino-modified silica adsorbent, TRI-PE-MCM-41, and a structured monolithic contactor unit. We have studied several different temperature swing adsorption processes using the purity of CO2 and annual product throughput as metrics for comparing process performance. This analysis identifies some of the operational parameters, adsorbent characteristics, and other factors that have a significant effect on the performance of the process. Using the total energy requirement of the process and available sources of energy, such as low pressure steam and electricity, we carry out an economic analysis to obtain a net operating cost for air capture of CO2. We identify a process with a daily throughput of similar to 1.1 t CO2 at 88.5% purity using standard shipping container sized air capture units. The total energy required (6745 MJ/t CO2) is dominated by the parasitic losses-sensible heat requirements of the contactor (40%) and the adsorbent (28%) and not by the mechanical energy associated with air flow (similar to 5%). On the basis of our analysis of factors such as source of electricity, availability of low pressure steam, and geographic location, the net operating cost of capture is estimated to be similar to$100/t CO2. These cost estimates do not include capital expenses necessary to construct or maintain the air capture units. Potential strategies for further reducing the energy and monetary cost of these processes are identified. Our analysis supports continued work to establish the technological and economic feasibility of adsorption-based air capture.