Large Volume Inorganic Chemicals - Ammonia ... - ammk-rks.net

Chapter 22.4.5 Pre-reformingDescriptionA pre-reformer installed prior to the primary reformer, in combination with a suitable steamsaving project, reduces energy consumption and reduces marginally the NO x emissions.Pre-reforming takes place through an adiabatically operated catalyst bed, before the primaryreformer. The cooled gas needs to be reheated before it is passed to the primary reformer. Theprimary reforming duty is reduced as less firing is needed (less NO x emissions) allowing, at thesame time, a lower S/C ratio (energy saving) to be achieved.Achieved environmental benefits• up to 5 – 10 % heat load reduction (reduced energy consumption)• reduced emissions to air.Cross-media effectsNone believed to be likely.Operational dataNo information provided.ApplicabilityThis is an integrated technique applicable in new and existing conventional steam reformingplants and reduced primary reforming plants.EconomicsCombined improvements in NO x reduction and the usage of surplus steam from an adjacentsource leads to an overall cost saving.Driving force for implementationConversion of steam savings to fuel gas savings.References to literature and example plants[3, European Commission, 1997], [73, Riezebos, 2000]66 Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers