Abstract
In this work, an exergy analysis is performed for the waste heat recovery section (WHRS) of the steam-natural gas reforming (SNGR) process as a major energy intensive process. Two alternate conditions are investigated to evaluate the required thermodynamic parameters: normal operating condition and increase of C2+ components in the process feed stream. At normal operating condition, the exergy efficiency of WHRS amounts to 0.58 while some 17.2 kJ energy is destructed for each mole of H2 produced. If heavier than methane components are increased in the feed up to 8.5 mole %, despite the increase of H2 production, the exergy efficiency decreases down to 0.54 and exergy destruction is reduced to 13.8 kJ for each mole of H2 produced. It is concluded that waste heat recovery has an important role on the exergy parameters of steam reforming processes, and an efficient heat exchange mechanism should be designed for this purpose. In addition, a change of reforming feed composition has a significant effect on the ...
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