Modeling and simulation of an industrial secondary reformer reactor in the fertilizer plants
In this paper, the industrial secondary reformer reactor has been modeled and simulated at steady-state operation conditions. It aims to modify a complete mathematical model of the secondary reformer design. The secondary reformer is a part of a subprocess in a higher scale unit of ammonia synthesis. It is located after the primary reformer in the ammonia plant where it is used in the synthesis of ammonia. The reactions in the secondary reformer reactor are assumed to be carried inside two reactors in series. The first reactor, upper section, is the combustion zone, while the second reactor, bottom section, is the catalyst zone with nickel catalyst based on the alumina. In order to create a reactor design model for the secondary reformer in the industrial ammonia plant, combustion and catalyst zones have been studied. The temperature and compositions of gas in the combustion zone are predicted using the atomic molar balance and adiabatic flame temperature model. In the catalyst zone, the temperature and composition profiles along the axial distance are predicted using a one-dimensional heterogeneous catalytic reaction model with the assumption that the reactions are first order in methane partial pressure.
Most of the methane is converted in the part of one fourth to one half of the catalyst zone length from inlet to outlet. The temperature gradient between the gas and catalyst surface decreases along the axial distance, and both temperatures approach the same value at the bottom of the catalyst bed. Finally, the results of this simulation have been compared with the industrial data taken from the existing ammonia unit in the State Company of Fertilizers South Region in the Basra/Iraq, which show a relatively good compatibility.
- Ebrahimi, H, Behroozsarand, A, Zamaniyan, A (2010) Arrangement of primary and secondary reformers for synthesis gas production. Chemical Engineering Research and Design 88: pp. 1342-1350 CrossRef
- Khorsand, K, Deghan, K (2007) Modeling and simulation of reformer autothermal reactor in ammonia unit. Petroleum and Coal J 49: pp. 64-71
- Yu, YH (2002) Simulation of secondary reformer in industrial ammonia plant. Chem Eng Tech J 25: pp. 307-314 CrossRef
- Raghunandanan, KS, Reddy, KV (1994) Development of a mathematical model for a secondary reformer. Chem Eng. Tech J 17: pp. 273-279 CrossRef
- Ravi, K, Dhingra, SC, Guha, BK, Joshi, YK (1989) Simulation of primary and secondary reformers for improved energy performance of an ammonia plant. Chem Eng Tech J 12: pp. 358-364 CrossRef
- Amirshaghaghi, H, Zamaniyan, A, Ebrahimi, H, Zarkesh, M (2010) Numerical simulation of methane partial oxidation in the burner and combustion chamber of autothermal reformer. Applied Mathematical Modeling 34: pp. 2312-2322 CrossRef
- Li, Y, Wang, Y, Zhang, X, Mi, Z (2008) Thermodynamic analysis of autothermal steam and CO2 reforming of methane. International Journal of Hydrogen Energy 33: pp. 2507-2514 CrossRef
- Pina, J, Borio, DO (2006) Modeling and simulation of an autothermal reformer. Latin American Applied Research J 36: pp. 289-294
- Shukri, MI, Songip, AR, Ahmad, A, Nasri, NS (2004) Simulation study of methane autothermal reforming for hydrogen production.
- Hoang, DL, Chan, SH (2004) Modeling of a catalytic autothermal methane reformer for fuel cell applications. Applied Catalysis J 268: pp. 207-216 CrossRef
- Xu, J, Froment, GF (1989) Methane steam reforming: II. Diffusional limitations and reactor simulation, AIChE J
- Smith, JM (1970) Chemical engineering kinetics.
- Sinnott, RK (1999) Unit operations. Butterworth-Heinemann, Oxford
- Coulson, JM, Richardson, JF, Bucharust, JR, Harker, JH (2002) Unit operations. Butterworth-Heinemann, Oxford
- Documents of State Company of Fertilizer Plant South Region
- Geankoplis, CJ (1983) Transport processes and unit operation. Prentice Hall Professional Technical Reference, New Jersey
- Luyben, W (1996) Process modeling, simulation, and control for chemical engineers. Mc Graw Hill, New York
- Modeling and simulation of an industrial secondary reformer reactor in the fertilizer plants
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International Journal of Industrial Chemistry
- Online Date
- July 2012
- Print ISSN
- Online ISSN
- Additional Links
- Autothermal reformer
- Steam reforming
- Reforming reactions
- Hydrogen production