Back to Search Start Over

Thermodynamic assessment of a solar/autothermal hybrid gasification CCHP system with an indirectly radiative reactor

Authors :
Chi-Hwa Wang
Xian Li
Yanjun Dai
Ye Shen
Timothy Kurnia Hardiman
Xiang Kan
Source :
Energy. 142:201-214
Publication Year :
2018
Publisher :
Elsevier BV, 2018.

Abstract

The solar/autothermal hybrid gasifier (SAHG) is an attractive approach to provide continuous production of the syngas via coupling autothermal and solar gasification together, where the SAHG mainly includes fully solar, hybrid, and fully autothermal modes. An ICE CCHP system driven by the SAHG with an indirectly irradiative two-cavity reactor introduced conceptually and investigated thermodynamically. Considering the effects of solar flux inputs and various reactant ratios, a zero-dimensional steady-state model of the SAHG was established by using Gibbs free energy minimization, and was validated with the reported data. The optimal steam-to-feedstock and oxygen-to-feedstock ratios has been achieved based on the restrictions of temperature over 1000 K and minimization of steam input. The results of two consecutive days indicate mole flow rates of H 2 and CO were increased by over 38.8% and 11.8%, respectively, leading to an increment in LHV s by 51.7%. An increment in primary energy ratio by 11.5% can be achieved by using the SAHG-CCHP system. The yearly assessment of the SAHG-CCHP system shows that the yearly average increments in heat, power, and cooling for the SAHG system were reached by 19.5%, 23.8%, and 4.5%, respectively. A yearly average increment of 14.2% in primary energy ratio can be obtained under the solar radiation condition of Singapore.

Details

ISSN :
03605442
Volume :
142
Database :
OpenAIRE
Journal :
Energy
Accession number :
edsair.doi...........55f77329b0af7f22431b0de65ce320e6
Full Text :
https://doi.org/10.1016/j.energy.2017.09.149