Application of chromium oxide-based redox reactions for hydrogen production via solar thermochemical splitting of water. (1st October 2020)

• Record Type: Journal Article
• Authors: Bhosale, Rahul R.
• Is Part Of: Fuel. Volume 277(2020)
• Publication Date: 2020-10-01
• Subjects: Cr2O3 -- Hydrogen -- Water splitting -- Thermodynamics -- Thermal reduction -- Solar-to-fuel energy conversion efficiency; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2020.118160
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: Rise in the T H from 1800 K to 2230 K was responsible for the complete TR of Cr2 O3. Q ̇ Cr 2 O 3 - r e d p a r t i a l - C r - W S rose by 1906.2 kW with an upsurge in T H from 1800 K to 2230 K. η solar - t o - f u e l - C r - W S reached the peak value (26.4%) at T H equal to 2000 K. 100% HR resulted in attaining the η solar - t o - f u e l - H R - C r - W S = 48.3% (at T H = 2000 K) Abstract: Thermodynamic equilibrium, as well as efficiency analysis of the Cr2 O3 /Cr water splitting (Cr-WS) cycle, was conducted in this study. The thermodynamic properties required for the computations were obtained from an HSC Chemistry 9.9 software. An increase in thermal reduction (TR) temperature ( T H ) from 1800 K to 2230 K was responsible for the rise in the percentage TR of Cr2 O3 (Tr-Cr) from 0% to 100%. The equilibrium analysis additionally indicates that the re-oxidation of Cr into Cr2 O3 via WS reaction is feasible at any temperature from 300 to 3000 K (we have selected 1300 K for this study). The efficiency analysis indicates that the Q ̇ solar - r e a c t o r - C r - W S and Q ̇ solar - h e a t e r - C r - W S were enhanced by 3636.8 kW and 260.0 kW due to the increment in the T H from 1800 K to 2230 K. The increase in the Q ̇ solar - r e a c t o r - C r - W S and Q ̇ solar - h e a t e r - C r - W S resulted into a rise in the Q ̇ solar - c y c l e - C r - W S by 3896.8 kW. The η solar - t o - f u e l - C r - W S increased from 9.5% to 26.4% when the T H was augmented from 1800 K to 2000 K. A further rise in the T H from 2000 K to 2230 K resulted in a reduction in the η solar - t o - f u e l - C r - W S from 26.4% to 21.3%. After employing the 100% heat recuperation, the η solar - t o - f u e l - H R - C r - W S of the Cr-WS cycle was improved up to 48.3% at T H = 2000 K.