0
Research Papers: Gas Turbines: Coal, Biomass, Alternative Fuels and Combustion & Fuels

A Novel Approach to Enhance the Hydrogen Yield of Biomass Gasification Using CO2 Sorbent

[+] Author and Article Information
Madhukar R. Mahishi

Mechanical & Aerospace Engineering, University of Florida, P.O. Box 116300, Gainesville, FL 32611-6300mahishi@ufl.edu

M. S. Sadrameli1

Department of Chemical Engineering, University of North Dakota, Grand Forks, ND 58202ameli@und.edu

Sanjay Vijayaraghavan

Mechanical and Aerospace Engineering,  University of Florida, P.O. Box 116300, Gainesville, FL 32611-6300sanv@ufl.edu

D. Y. Goswami

Clean Energy Research Center,  University of South Florida, 4202 E Fowler Avenue, Tampa, FL 33620goswami@eng.usf.edu

1

On sabbatical from Tarbiat Modarres University, Tehran, Iran.

J. Eng. Gas Turbines Power 130(1), 011501 (Nov 02, 2007) (8 pages) doi:10.1115/1.2747252 History: Received September 05, 2005; Revised December 23, 2006; Published November 02, 2007

Hydrogen yield of conventional biomass gasification is limited by chemical equilibrium constraints. A novel technique that has the potential to enhance the hydrogen yield by integrating the gasification and absorption reactions has been suggested. The method involves gasification of biomass in presence of a CO2 sorbent. Ethanol was used as the model biomass compound and CaO was the representative sorbent. Equilibrium modeling was used to determine the product gas composition and hydrogen yield. The analysis was done using ASPEN PLUS software (version 12.1) and the Gibbs energy minimization approach was followed. The effects of temperature, pressure, steam/ethanol ratio, and CaO/ethanol ratio on product yield were investigated. Three case studies were conducted to understand the effect of sorbent addition on the hydrogen yield. Thermodynamic studies showed that the use of sorbents has the potential to enhance the equilibrium hydrogen yield of conventional gasification by 19% and reduce the equilibrium CO2 content of product gas by 50.2%. It was also found that the thermodynamic efficiency of sorbent-enhanced gasification (72.1%) was higher than conventional gasification (62.9%). Sorbent-enhanced gasification is a promising technology with a potential to improve the yield and lower the cost of hydrogen production.

FIGURES IN THIS ARTICLE
<>
Copyright © 2008 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 7

Simulation flow sheet of ethanol steam reforming with CaO sorbent (sorbent placed in reformer) (case II)

Grahic Jump Location
Figure 8

Effect of reformer temperature on product yield (steam∕EtOH=4, P=1atm, CaO∕EtOH=3)

Grahic Jump Location
Figure 9

Effect of pressure on product yield (steam∕EtOH=4, T=700°C, CaO∕EtOH=3)

Grahic Jump Location
Figure 10

Effect of steam/EtOH ratio on the product yield (T=700°C, P=1atm, CaO∕EtOH=3)

Grahic Jump Location
Figure 11

Effect of CaO∕EtOH ratio on product yield (steam/EtOH ratio=4, T=700°C, P=1atm)

Grahic Jump Location
Figure 12

Simulation of ethanol steam reforming including CaO sorbent (sorbent placed in WGS reactor) (case III)

Grahic Jump Location
Figure 1

Concept of sorbent-enhanced biomass gasification

Grahic Jump Location
Figure 2

Schematic of sorbent-enhanced gasification

Grahic Jump Location
Figure 3

Simulation flow sheet of conventional ethanol steam reforming (no sorbent) (case I)

Grahic Jump Location
Figure 4

Effect of reformer temperature on the product yield (steam/EtOH ratio=4, P=1atm, no sorbent)

Grahic Jump Location
Figure 5

Effect of reactor pressure on the product yield (steam/EtOH ratio=4, T=700°C, no sorbent)

Grahic Jump Location
Figure 6

Effect of steam/EtOH ratio on product yield (T=700°C, P=1atm, no sorbent)

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In