Techno-economic study of CO2 capture from an existing coal-fired power plant: MEA scrubbing vs. O2/CO2 recycle combustion
Techno-economic study of CO2 capture from an existing coal-fired power plant: MEA scrubbing vs. O2/CO2 recycle combustion
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DOI：
10.1016/s0196-8904(03)00040-2
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发表时间：
2003-11
影响因子：
10.4
通讯作者：
D. Singh;E. Croiset;P. Douglas;M. Douglas
中科院分区：
文献类型：
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作者：
D. Singh;E. Croiset;P. Douglas;M. Douglas
现有的现代化燃煤电厂提供了一个机会，在未来几年内实现温室气体排放的显着减少，提供了有效和经济的二氧化碳捕获技术可用于改造。一种选择是使用胺洗涤等常规方法从燃烧产物中分离CO2。一种新兴的替代方案，通常称为O2/CO2循环燃烧，涉及在循环烟道气的气氛中与氧气一起燃烧煤。这两种方法都可以改造现有的装置，但它们消耗大量的能源来捕获，净化和压缩二氧化碳，以便随后封存。本文介绍了两种方法的性能的技术经济比较。使用商业过程模拟软件包Hysys和白杨Plus进行比较。结果表明，这两种方法都是昂贵的选择，以捕捉CO2从燃煤电厂，但O2/CO2似乎是一个更有吸引力的改造比MEA洗涤。MEA案例的CO2捕集成本为53美元/吨CO2避免，换算为3.3美分/千瓦时。对于O2/CO2的情况，CO2捕获成本较低，为35美元/吨CO2避免，转化为2.4美分/千瓦时。这些捕获成本相当于目前电价的大约20-30%。
The existing fleet of modern pulverised coal fired power plants represents an opportunity to achieve significant reductions in greenhouse gas emissions in the coming years providing that efficient and economical CO2capture technologies are available for retrofit. One option is to separate CO2from the products of combustion using conventional approaches such as amine scrubbing. An emerging alternative, commonly known as O2/CO2recycle combustion, involves burning the coal with oxygen in an atmosphere of recycled flue gas. Both approaches can be retrofitted to existing units, however they consume significant amounts of energy to capture, purify and compress the CO2for subsequent sequestration. This paper presents a techno-economic comparison of the performance of the two approaches. The comparison was developed using the commercial process simulation packages, Hysys & Aspen Plus. The results show that both processes are expensive options to capture CO2from coal power plants, however O2/CO2appears to be a more attractive retrofit than MEA scrubbing. The CO2capture cost for the MEA case is USD 53/ton of CO2avoided, which translates into 3.3 ¢/kWh. For the O2/CO2case the CO2capture cost is lower at USD 35/ton of CO2avoided, which translates into 2.4 ¢/kWh. These capture costs represent an approximate increase of 20–30% in current electricity prices.