In this paper, reformer auto-thermal reactor, which is the secondary reformer reactor in ammonia unit, has been modeled and simulated. The secondary reformer reactor is located after the primary one and consists of a combustion chamber and a catalytic bed. For simulation of this reactor, combustion chamber (flame area) has
been modeled assuming that the feed and excess inlet air to the reactor are fully mixed along the flame. Modeling of flame area yields flame temperature and concentration of reactor components and product, which have been used in modeling of catalytic bed. Finally, the results of this simulation have been compared with the industrial data taken from the existing ammonia unit in Khorasan Petrochemical Complex, which show a relatively good compatibility.
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