Primary Reformer plays an important role in the production of ammonia. The reformer is composed of a large number of tubes filled with a catalyst (usually nickel-based) which is used to promote the reaction. The goal of reforming is to prepare as pure as possible a gas mixture of nitrogen and hydrogen in a 3:1 stoichiometric ratio from the raw materials of water, air, and natural gas.
Mechanical Design of the Primary Reformer: The primary reformer is modeled in ASPEN as an RGibbs reactor with RK Soave equations of state. An operating temperature of 800 C and an operating pressure of 35.29 bars are found to yield the optimum process based on an analysis of sensitivity runs and industry standards. The primary reformer is heat flux limited. Thus, based on a calculated reformer heat duty of 50 MMkcal/hr, the reformer is sized to contain 230 catalyst tubes with 4" inner diameter and a length of 35'.
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