Analysis on H2 production process integrated CaO/Ca(OH)2 heat storage and sorption enhanced staged gasification using calcium looping. (1st February 2022)

• Record Type: Journal Article
• Authors: Zhang, Chunxiao; Li, Yingjie; Yang, Liguo; Fan, Xiaoxu; Chu, Leizhe
• Is Part Of: Energy conversion and management. Volume 253(2022)
• Publication Date: 2022-02-01
• Subjects: H2 production -- Sorption enhanced staged gasification -- Calcium looping -- CaO/Ca(OH)2 heat storage -- Biomass/coal co-gasification; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2021.115169
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: CaO/Ca(OH)2 heat storage is integrated with gasification of fuel for H2 production. Thermodynamic simulation of the integrated process is performed by Aspen Plus. Integrated heat storage raises CO2 capture by CaO to yield more H2 . Energetic and exergetic performances are improved by integrated heat storage. Abstract: A novel H2 production process integrated CaO/Ca(OH)2 heat storage and sorption enhanced staged gasification of biomass/coal based on calcium looping was proposed. The proposed process consists of four units such as co-pyrolysis of biomass and coal, char gasification with recycled CO2, sorption enhanced H2 production and CaO/Ca(OH)2 heat storage. CaO is used as CO2 sorbent to enhance water gas shift reaction for H2 production. Exhausted CaO experienced the multiple cycles from the sorption enhanced H2 production unit is sent to the CaO/Ca(OH)2 heat storage unit for the reactivation. Then the reactivated CaO is fed into the sorption enhanced H2 production unit again for the next cycle. To evaluate the overall performance of the proposed process, the thermodynamic simulation was performed by using Aspen Plus. The results show that the integrated process is more beneficial for H2 production compared with the normal sorption enhanced staged gasification process. Integrated CaO/Ca(OH)2 heat storage unit reduces the amount of required CaO and promotes H2 production, energy conversion efficiency and exergy efficiency of the normal process. The novel process operated at the optimum conditions achieves 17.4% higher H2 yield than the normal process. At this condition, the corresponding H2 yield of 1.08 Nm 3 /kg-fuel, energy conversion efficiency of 42.1%, exergy efficiency of 39.4% and CO2 capture efficiency of 96.6% are achieved in the integrated process. Therefore, H2 production process integrated CaO/Ca(OH)2 heat storage and sorption enhanced staged gasification based on calcium looping appears promising.