From insights Spring 2011.
Reprinted (with modifications) with permission of the Turbomachinery Laboratory (http://turbolab.tamu.edu). From Proceedings of the First Middle East Turbomachinery Symposium, February 13-16, 2011, Doha, Qatar, Copyright 2011.
Carbon dioxide (CO2) has numerous industrial and commercial uses, such as for enhanced oil recovery (EOR) in mature producing oil fields. One of the more recent applications for compression of CO2 that is generating growing interest is that of carbon capture and sequestration (CCS) for the purpose of preventing accelerated climate change. From a compression equipment perspective, CCS and CO2 EOR are very similar, as they aim at both improving production and reducing emissions.
CO2 compression (especially with significant presence of other components like methane) pres- ents a number of technical challenges, by nature of the gas and the levels of pressure involved in order to inject the carbon dioxide at sufficient depths in the ground. This paper focuses on the essential aspects of the design of a centrifugal compressor for a CO2 (with 15 percent CH4) injection application requiring a discharge pressure of 4,500 psia (310 bara). Of particular inter- est are the characteristics related to aerodynamic and rotordynamic performance. As such, this paper also presents the details and results of the testing performed at the compressor manufac- turer’s factory that confirmed the soundness and acceptability of the design.