INGAR   05399
INSTITUTO DE DESARROLLO Y DISEÑO
Unidad Ejecutora - UE
artículos
Título:
Modeling and optimal design of cyclic processes for hydrogen purification using hydrides forming metals
Autor/es:
TALAGAÑIS, B.; MEYER, G.; OLIVA, D.; FUENTES, M.; AGUIRRE, P.
Revista:
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2014 vol. 39 p. 18997 - 19008
ISSN:
0360-3199
Resumen:
Hydrogen at high purity degrees can be obtained by using the well-known
Pressure Swing Adsorption (PSA) process. In this paper, a Pressure Swing
Absorption (PSAb) alternative operating batch wise is analyzed. An
optimal design of cyclic processes for hydrogen purification using
hydride-forming metals as absorption material is addressed. The selected
case study is a thermo-chemical treatment process that consumes high
purity hydrogen to reduce oxides and generates a waste stream that
contains residual H2. PSAb process is fed with this
hydrogen-poor stream; and high purity hydrogen recovery levels are
obtained. A mathematical model based on an energy integrated scheme is
presented to develop the optimal process design and to obtain optimal
operating conditions. Various optimized solutions are compared by
modifying key parameters or restriction equations. Thus, an interesting
trade-off between H2 recovery and system size is analyzed. Large systems operate at large cycle times, obtaining up to 98% of H2 recovery in the order of hours, whereas small systems can recover up to 60% of H2 in short cycles of a few seconds.