Cost evaluation of CO2 sequestration by aqueous mineral carbonation
Cost evaluation of CO2 sequestration by aqueous mineral carbonation
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DOI：
10.1016/j.enconman.2007.01.035
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发表时间：
2007-07-01
影响因子：
10.4
通讯作者：
Witkamp, Geert-Jan
中科院分区：
文献类型：
--
作者：
Huijgen, Wouter J. J.;Comans, Rob N. J.;Witkamp, Geert-Jan
以硅灰石（CaSiO3）和钢渣为原料，对水相矿物碳酸化封存CO2的成本进行了评价。首先，对该过程进行了模拟，以确定流的性质以及工艺设备的功率和热量消耗。其次，对主要工艺设备进行了基本设计，并利用公开文献资料和因子成本估算法估算了总投资成本。最后，根据投资折旧和可变和固定运营成本确定封存成本。硅灰石和钢渣的预估成本分别为每吨二氧化碳净减少102欧元和77欧元。对于硅灰石，主要成本与原料和研磨和压缩的电力消耗有关（分别避免了54欧元和26欧元/吨二氧化碳）。敏感性分析表明，影响封存成本的其他参数包括碳化反应器中的液固比和碳化产物的可能值。由于没有原料成本，钢渣的封存成本大大降低。虽然已经确定了各种可能降低成本的方法，但相对于其他二氧化碳储存技术，目前采用的水碳酸化方法的二氧化碳封存似乎成本高昂。矿物碳酸化对二氧化碳的永久和固有的安全封存可能证明成本较高是合理的，但需要进一步降低成本，特别是考虑到二氧化碳排放权的（当前）价格。以固体残渣（如钢渣）作为原料和/或有用的碳化产品进行矿物碳化的小生境应用，是经济上可行的二氧化碳封存过程的最佳前景。(c) 2007 Elsevier Ltd.版权所有。
A cost evaluation of CO2 sequestration by aqueous mineral carbonation has been made using either wollastonite (CaSiO3) or steel slag as feedstock. First, the process was simulated to determine the properties of the streams as well as the power and heat consumption of the process equipment. Second, a basic design was made for the major process equipment, and total investment costs were estimated with the help of the publicly available literature and a factorial cost estimation method. Finally, the sequestration costs were determined on the basis of the depreciation of investments and variable and fixed operating costs. Estimated costs are 102 and 77 Euro/ton CO2 net avoided for wollastonite and steel slag, respectively. For wollastonite, the major costs are associated with the feedstock and the electricity consumption for grinding and compression (54 and 26 Euro/ton CO2 avoided, respectively). A sensitivity analysis showed that additional influential parameters in the sequestration costs include the liquid-to-solid ratio in the carbonation reactor and the possible value of the carbonated product. The sequestration costs for steel slag are significantly lower due to the absence of costs for the feedstock. Although various options for potential cost reduction have been identified, CO2 sequestration by current aqueous carbonation processes seems expensive relative to other CO2 storage technologies. The permanent and inherently safe sequestration of CO2 by mineral carbonation may justify higher costs, but further cost reductions are required, particularly in view of (current) prices of CO2 emission rights. Niche applications of mineral carbonation with a solid residue such as steel slag as feedstock and/or a useful carbonated product hold the best prospects for an economically feasible CO2 sequestration process. (c) 2007 Elsevier Ltd. All rights reserved.