Secondary reforming

A secondary reformer is an autothermic unit located directly after a tubular type fired reformer in a typical ammonia plant. In a secondary reformer, primary reformer effluent gas is initially mixed with air. These serve two purposes, first, it introduces the proper amount of nitrogen into the system and secondly, rapid reaction of the process gas with air provides the heat required for additional reforming. The Secondary reformer is operated at much higher temperature where the temperature at the point of mixing air or oxygen and tubular reformer effluent may reach 1200oC or more. This extremely high temperature needs a refractory type catalyst to withstand this temperature without encountering catalyst fusion. The catalyst used in this location commonly called as heat shield layer catalyst. Meanwhile main bed catalyst to conduct reforming reaction is located beneath heat shield layer. The following is Süd-Chemie’s standard secondary reforming catalyst for above application:

ReforMax 400 GG, an active heat shield, is placed as the top bed catalyst layer while a reforming catalyst, as main bed, at the bottom. The fraction of heat shield layer ranges from 10 to 20 percent volume of total catalyst. It is usual to protect the catalysts from direct firing by placing a target brick on the top heat shield layer. The original name of this catalyst type is C14-4 GG.

ReforMax@ 400 LDP is the bulk of catalyst loading for secondary reforming reaction. It is placed beneath an active heat shield. The fraction of this catalyst layer ranges from 80 to 90 percent. The original name is C14 LDP.

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