Abstract: Carbon capture and storage (CCS) consists of separation,compression, transportation and storage of CO₂ from exhaust gas such as vent gases of coalfired power plant. CCS is considered to be the most effective choice for mitigating greenhouse gas of CO₂ in the middle and short-term, and attracts more attention recently. Although CCS has been proved to be feasible in technology, it is still unsuitable for commercialization on a large scale due to high cost at present. Most models developed for cost estimation focused on individual process of CCS, especially on capture process. In this paper, definition formulas were given to calculate the total cost of CCS overall process and of emission cuts of CO₂. Furthermore, a model economy is developed to estimate total capital and cost for MEA capture,compression, pipeline transportation and saline storage. The economic study for a case of 600 MW PC power plant is also carried out in the paper. The results show that,when CO₂ recovery efficiency ranges from 70% to 99%,the total CCS cost for the case is 257—269 CNY·(t CO₂)^-1,and the cost for emission reduction of CO₂ is 364.8—384.2 CNY·(t CO₂)^-1 respectively.

Key words: CO₂ capture；CO₂ transportation, saline storage；power plant；economic

摘要： 碳捕集与封存技术（即CCS技术）通过对CO₂进行捕集、压缩、运输与封存，可实现CO₂大规模减排，近年来受到广泛关注。CCS技术的经济成本是其商业化的关键因素，但目前多数研究都集中在捕集过程，CCS全过程的经济成本分析鲜见报道。针对CO₂捕集与咸水层封存系统，给出了捕集封存全过程投资运行总成本和捕集封存整体系统CO₂减排成本的计算公式，建立了CO₂捕集、压缩、管道运输与咸水层封存全过程的成本估算模型，并对典型的600 MW超临界燃煤电厂捕集封存CO₂的投资运行成本和减排成本进行了案例研究。