An Energy Exchangeable Solid-sorbent Based Multi-stage Fluidized Bed Process for CO2 Capture. (July 2017)

• Record Type: Journal Article
• Authors: Park, Yong-Ki; Seo, Hwimin; Kim, Kiwoong; Kim, Dae Jin; Min, Da Young; Kim, Hye Mi; Choi, Won Choon; Kang, Na Young; Park, Sunyoung
• Is Part Of: Energy procedia. Volume 114(2017)
• Page Start: 2410
• Page End: 2420
• Publication Date: 2017-07
• Subjects: Solid-sorbent -- Multi-stage Fluidized Bed -- CO2 Capture -- Bench Process -- Heat Recovery -- Solid-solid Heat Exchanger; Power resources -- Congresses; Power resources -- Periodicals; Power resources; Conference proceedings; Periodicals; 333.7905
• DOI: 10.1016/j.egypro.2017.03.1388
• Languages: English
• ISSNs: 1876-6102

Abstract

Abstract: A multi-stage fluidized bed process for CO2 capture is a novel process for reducing regeneration energy. This process is consist of low-, mid-, and high-temperature stage. Each stage has an absorber and a regenerator. Solid absorbents circulating in these fluidized beds absorb and regenerate CO2 by temperature swing. PEI-, MgO-, and Li4 SiO4 -based absorbents are utilized for low-, mid-, and high-temperature stage. The main feature of this process is a heat recovery scheme; i) an intra-stage heat exchanger, ii) an inter-stage heat exchanger. In the intra-stage heat exchanger, a sensible heat of lean and rich sorbents from regenerator and absorber is exchanged. In the inter-stage heat exchanger, a heat of absorption of mid- and high-temperature stage is supplied to a heat of regeneration of low- and mid-temperature stage. A bench-scale facility that can process 60 Nm 3 /hr flue gas is constructed for conducting a feasibility study of this process. From the experiments of the low-temperature stage, it can capture CO2 with an efficiency of 80%, however, due to a low efficiency of intra-stage heat exchanger, the regeneration energy and total utility cost are estimated as 4.65 GJ and $36.9 per ton-CO2 . The three-stage process is evaluated through a process simulation study based on the absorption performance measured at a lab-scale apparatus. The resulted regeneration energy is estimated as 2.37 GJ per ton CO2 and total utility cost is $39.1 and $24.5 per ton CO2 in the absence and in the present of steam-turbine, respectively. Finally, a parametric study of the absorption capacity of sorbents and MTA of intra-stage heat exchanger are also been conducted and discussed.