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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 45697 (06)
- University: Sharif University of Technology
- Department: Chemical and Petroleum Engineering
- Advisor(s): Farhadi, Fathollah
- Abstract:
- With the global oil price increase in recent years and fossil fuel resource scarcity, analyzing of fossil fuel consumer industries and optimization of their fuel consumption is an important rule. Exergy analysis is an efficient tool for this purpose in the chemical and petrochemical processes in recent years more than ever. Therefore, in this work, an exergy analysis is performed for heat recovery section of Steam-Methane Reforming (SMR) process as a major consumer of natural gas.
This work contains five general section. At the first section, exergy and energy concepts, reforming processes and other related basic concepts are described. The second section is about the recent research and studies on the exergy analysis of reforming processes. The steam-methane reforming (SMR) process of a huge mega-methanol plant in Iran is described in the third section and the process simulation results are presented. An exergy analysis is carried out for the heat recovery section of SMR process in the fourth section. In this section, four alternate conditions are investigated: normal operating condition, over loading condition, alternate possible heat exchangers arrangement and increase of C2+ components in the process feed stream.
In normal operating condition, the exergy efficiency of heat recovery section amounts to 0.719 while some 5.315 Mj energy is destructed for each kg of H2 produced. If the reformer capacity is increased by 7%, the exergy efficiency reaches its maximum value of 0.735.
A pinch-based change in the layout of heat exchangers in the recovery section does not cause a major change neither in exergy efficiency nor in exergy destruction. If heavier than methane components are increased in the feed up to molar 8.5%, despite the increase of H2 production, the exergy efficiency decreases down to 0.673 and exergy destruction is reduced to 4.7 Mj energy for each kg of H2 produced - Keywords:
- Exergy Analysis ; Steam Methane Reforming ; Heat Recovery Section
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