气体压缩机
液化
制冷
压缩比
压气站
温室气体
透平膨胀机
环境科学
工艺工程
工程类
核工程
汽车工程
机械工程
岩土工程
生物
内燃机
生态学
作者
Sergey Martynov,N.K. Daud,H Mahgerefteh,Solomon Brown,R. Porter
标识
DOI:10.1016/j.ijggc.2016.08.010
摘要
The economic viability of Carbon Capture and Sequestration (CCS) as a means of mitigating CO2 emissions is significantly dependent on the minimisation of costs associated with the compression and transportation of the captured CO2. This paper describes the development and application of a detailed thermodynamic model to compute and compare power requirements for various multistage compression strategies for CO2 streams containing typical impurities originating from various capture technologies associated with industrial and power emission sectors. The compression options examined include conventional multistage integrally geared centrifugal compressors, supersonic shockwave compressors and multistage compression combined with subcritical liquefaction and pumping. In order to estimate the power demand for inter-stage cooling and liquefaction a thermodynamic model based on Carnot refrigeration cycle is applied. The study shows that for all the compression options examined, the compression power reduces with the increase in the purity of the CO2 stream, while the inter-stage cooling duty is predicted to be significantly higher than the compression power demand. For CO2 streams carrying less than 5% impurities, multistage compression combined with liquefaction and subsequent pumping from ca 62 bar pressure can offer higher efficiency than conventional gas-phase compression. In the case of a raw/dehumidified oxy-fuel CO2 stream of ca 85% purity, subcritical liquefaction at 62 bar pressure is shown to increase the cooling duty by ca 50% as compared to pure CO2.
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