Evaluation of thermodynamically favorable operating conditions for production of hydrogen in three different reforming technologies

Reference:

Seo, Y. S., Shirley, A. and Kolaczkowski, S. T., 2002. Evaluation of thermodynamically favorable operating conditions for production of hydrogen in three different reforming technologies. Journal of Power Sources, 108 (1-2), pp. 213-225.

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Abstract

With the aid of thermodn. anal. using AspenPlus, the characteristics of three different types of reforming process are investigated. These include: steam-methane reforming (SMR), partial oxidn. (POX) and autothermal reforming (ATR). Thereby, favorable operating conditions are identified for each process. The optimum steam-to-carbon (S:C) ratio of the SMR reactor is 1.9. The optimum air ratio of the POX reactor is 0.3 at a preheat temp. of 312 Deg. The optimum air ratio and S:C ratio of the ATR reactor are 0.29 and 0.35, resp. at a preheat temp. of 400 Deg. Simulated material and energy balances show that the CH4 flow rates required to generate 1 mol/s of hydrogen are 0.364 mol/s for POX, 0.367 mol/s for ATR and 0.385 mol/s for the SMR. These results demonstrate that the POX reforming system has the lowest energy cost to produce the same amt. of hydrogen from CH4.

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