Author/Authors :
M. A. Ebrahimi , M. R. G. Arsalan , S. Fatemi Laboratory of Adsorption Processes, School of Chemical Engineering, Faculty of Engineering, University of Tehran, Tehran
كليدواژه :
H2 purification , Pressure swing adsorption , Modeling , Simulation
چكيده لاتين :
Pressure swing adsorption (PSA) is one of the most economic technologies,to produce high purity
hydrogen with high performance. PSA is an energy-efficient alternative for separation of hydrogen
from reforming products. In this work, simulation of an industrial PSA process with double-layer
columns is developed for purification of hydrogen from methane steam reforming product,
containing H2, CO2, CH4, CO and N2 gaseous mixture. The dual-sorbent PSAbed consists of an
initial layer of activated carbon for trapping CO2, CH4 and a subsequent layer of zeolite (5A) for
removing CO and N2. This simulation package consists of nine different steps such as; adsorption,
two stages equalization in desorption mode, providing purge,dump, purge, two equalization stages
for adsorption and repressurization by product. The mass and momentum balances along the time
and length of the packed beds aresimultaneousely resolved by MATLAB programming. By using
the result of simulation, fraction of hydrogen product, recovery of hydrogen, pressure profile of
the column at different steps, mass transfer zone of the impurities, loading profile of impurities at
different steps and velocity profile of the gas phase are reported.The simulation results present
good agreement with the actual industrial results of the outlet hydrogen purity as close as 100%
and recovery of outlet hydrogen as 71%.
