Operation of a Mixing Seal Valve in Calcium Looping for CO2 Capture

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• 作者：Ana Mart铆nez ; Yolanda Lara ; Pilar Lisbona ; Luis M. Romeo
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：March 20, 2014
• 年：2014
• 卷：28
• 期：3
• 页码：2059-2068
• 全文大小：400K
• 年卷期：v.28,no.3(March 20, 2014)
• ISSN：1520-5029

文摘

Calcium looping has attracted a great deal of attention among researchers investigating CO₂ capture systems. Energy consumption in the regeneration reactor is one of the most important issues. However, as a high-temperature process, calcium looping enables an efficient heat recovery in the capture process itself. The objective of this study is to reduce the energy consumption in the calciner by increasing the temperature of the solids entering this reactor. A calcium looping system including a mixing seal valve is modeled and analyzed to determine the potential advantages this configuration entails. The influence of different seal valve aeration gases, carbonator inventories and solid circulation between reactors is assessed. The reduction of the fuel consumption when the mixing seal valve is aerated with flue gas tends to dilute the CO₂ stream. When using CO₂, the achievement of substantial energy savings may imply an important increase of the solid flows in the system. Aeration of the mixing seal valve with both gases, so that each gas aerates one exit, is also proposed to address these issues. Results show a significant potential in terms of coal and oxygen savings and reduction of the CO₂ generated in the capture system.