AD ALTA
JOURNAL OF INTERDISCIPLINARY RESEARCH
and CO in reaction 2 to convert further. Nonetheless, generation
of large amount of steam at high pressure for reaching to the
level of complete conversion of methane and CO requires a
great deal of energy. In addition, it decreases the process
efficiency drastically and increases the total energy demand.
However, moderate steam-to-carbon ratio is used to optimize
the process.
Figure 5
B) Diagram of hydrogen composition-S/C ratio in heat-
integrated SMR process where the temperature of the H-WGS
and L-WGS reactors are constant at 350°C and 200°C,
respectively, temperature is constant at 700°C and pressure
(1010 Kpa) is constant through the whole process.
5 Conclusions
In this study, a simulation of hydrogen production system via
SMR and PSA processes was discussed and compared with
previous works. In proposed process, a network of nine heat
exchangers was used to reduce energy consumption. Eight heat
exchangers recovered the heat loss of SMR process and one heat
exchanger recovered the heat loss of PSA process. A part of the
recovered heat in the SMR process was used to provide energy
for endothermic desorption reaction. Similarly, heat of
exothermic adsorption reaction was used to increase the sensible
and latent heat of water feed stream. In addition, to reduce
energy consumption and energy recovery, the temperature of
reformer was increased. Compared to Chunfeng Song et al.
(2015) design, the energy consumption was reduced to zero in
the proposed PSA process, while in the conventional process
9.71 Kj/mole H2 and in the heat integrated PSA process 3.7
Kj/mole H2 energy was consumed, respectively. On the other
hand, in the SMR process, the energy consumption of the new
design was less than conventional and heat integrated process
which is 34.55 Kj/mole H2, whereas the amount of energy
consumption in conventional and heat integrated SMR process
was 92.4 Kj/mole H2 and 36.63 Kj/moleH2, respectively. In
conclusion, the total energy consumption in the proposed design
was reduced by 66.2% compared to conventional hydrogen
production system and 14.32% in comparison to heat integrated
hydrogen production system.
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Primary Paper Section: C
Secondary Paper Section: CI, JP
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