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

Chapter 22.3.3 Other consumption levelsProcess Unit Remark Reference0.6 – 0.7 At stoichiometric conversionSteam reforming 1.5 Total supply at a S/C ratio of 3.0Process steamkg/kg NH 31.6 For each production line of Agrolinz MelaminPartial oxidation 1.2Total supplyConventional steamEqual to 0.85 kg N1.12 /kg NH 3 . The levels are 50 – 100 % higher forProcess airreformingkg air/kg NH 3 reduced primary reformingPartial oxidation 4Air fed to the air separation unitBoiler feed-water 0.7 – 1.5 kg/kg NH 3Only the process steam consumption has to be replenished by outsidewater, assuming all steam condensates are recycled. The amountsdepend on whether the process condensate is recycled or not. Smalladditional losses and potential import/export of steam have to beallowed for in practice. Air and/or water for cooling will differ fromone site to anotherSolvents are mainly losses by leaks. The level equals approx. 2 kg/hourSolvents CO 2 removal 0.02 – 0.04 kg/tonne NH 3for a typical capacity plant.Standard treatment additives and regeneration agents are used in theAdditivesboiler feed-water treatment units. Consumption figures should notdiffer from those of a standard steam boiler plant at the same locationCatalyst replacementHydro-desulphurisation 1Sulphur removal 5Primary reforming 5Secondary reforming 4High temperature shift 10Low temperature shift 20Methanation 2Synthesis 10m 3 /yearTable 2.8: Other reported consumption levels for the production of ammoniaApproximate consumption figures, based on average filling volumesand normally recommended operating periods, for a gas-basedconventional reforming plant. The usage refers to a 1500 t/d capacity.Actual usage in existing and new plants may differ considerably[1, EFMA, 2000,6, German UBA,2000, 9, AustrianUBA, 2002]54 Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers