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Type: Artigo de evento
Title: Exergoeconomic Study Of Hydrogen Production From Steam Reforming Of Natural Gas
Author: Alves L.G.
Nebra S.A.
Abstract: Steam Reforming of Natural Gas is, at the moment, the most economical process for producing hydrogen. This work performs an exergetic and exergoeconomic study of this process. The main steps in hydrogen production from steam reforming are the reforming reaction, the shift reaction and the hydrogen purification. The final hydrogen has purity of about 99,999% (wt) and can be used in fuel cells. Synthesis Gas containing H2, H2O, CO2, CO and residual CH4 is formed inside the reformer; its composition depends on the Steam-CH4 ratio and the temperature-pressure conditions. Equilibrium conditions in the synthesis gas components are considered at reformer exit. After reforming, shift reaction converts CO and H2O into CO2 and H2. Absorption in diethanolamine is used to separate CO2 from the gas stream. CO2 can be collected and sold as a by-product. Fixed adsorption beds are used to purify the hydrogen, eliminating H2O, CO2 and CO and CH4 residuals. An exergy analysis was performed in this process identifying the main sources of irreversibility. The exergy flows are disaggregated into chemical and physical exergies. The theory of exergetic cost is applied to analyse the internal cost distribution. The results are discussed.
Editor: Tapir Academic Press
Rights: fechado
Identifier DOI: 
Date Issue: 2005
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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