Steady state kinetic model for entrained flow CO2 gasification of biomass at high temperature

M.A. Kibria, Pramod Sripada and Sankar Bhattacharya

Energy, 2020, vol. 196, issue C

Abstract: Entrained flow gasification technology is considered as a promising technology for its unique nature; high carbon conversion in short residence time and fewer pollutants emission for utilizing solid fuels towards high-value products. In a two-stage dry feed entrained flow gasifier, CO2 is the predominant gas species that evolves from combustion zone with a concentration around 77% and 18% during oxy and air-fired gasifier respectively. The CO2 rich gas stream acts as a reactant in the reduction zone that produces syngas. This article presents a kinetic model of CO2 gasification of biomass that mimics the reduction zone of a dry feed entrained flow reactor. The model is based on plug flow analogy for heat and mass balance. Explicit calculations are performed to calculate particle residence time. Gas-phase reactions are introduced, and the predicted results are compared against a bench-scale entrained flow reactor. The results indicate during high-temperature CO2 gasification condition; the gas-phase chemistry is dominated by the homogenous reverse water gas shift reaction (rWGSR). Particle structure plays an essential role by imposing diffusional effects during char conversion. An increased concentration of CO2 served a dual purpose: raising devolatilization rate and lowering the diffusional limitation.

Keywords: Gasification; Entrained flow; Model (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544220301808
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:196:y:2020:i:c:s0360544220301808

DOI: 10.1016/j.energy.2020.117073

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().