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

Chapter 88.4.5 Safe NH 3 washing from inertsDescriptionA special washing method was developed in order to remove NH 3 from the inert purge gasstream arising from the urea synthesis section of the plant under safe conditions. This processconsists of washing the inerts with water after the addition of a quantity of flammable gas, e.g.natural gas, in such an amount, that the composition is kept safely beyond the explosion limits.The washed inerts are sent to a burner together with the natural gas.Achieved environmental benefits• reduction of NH 3 emissions• recovery of NH 3• recovery of heat from H 2 .Cross-media effectsNone believed likely.Operational dataNo specific information provided.ApplicabilityThe applicability depends on:• the availability on site of flammable gas at the right pressure• the availability of the NH 3 recovery system• the possibility of using the resulting gas stream as a fuel, e.g. for a boiler.EconomicsCost benefits can be assumed.Driving force for implementationReduction of NH 3 emission and energy recovery from the inert gas.References to literature and example plantsYARA, Ferrara.Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers 345