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

Chapter 7• recovered heat from warm air results in fuel savings at the dryer• various benefits due to reduced volume flow in the scrubber system, e.g. as follows:reduced fan power (lower pressure drop associated with fabric filter or cyclones)reduced scrubber circulation pump powerreduced make-up water requirement (and resultant evaporation required)reduced fluoride emissions associated with reduced wet gas flow to atmosphere.The total dryer fuel savings are estimated to be in the range of 6 – 12 % which translates toapproximately USD 0.1 – 0.2 per tonne. The total power savings are estimated to beapproximately 2 kWh per tonne or USD 0.1 per tonne.Cross-media effectsThe technique requires a specific burner design, and higher NO x emissions can be expected (stillbelow 200 mg/Nm 3 NO x at 3 % O 2 [52, infoMil, 2001].Operational dataNo specific data provided.ApplicabilityGenerally applicable to all kinds of fertilisers. The problems with implementation/use of thistechnique have resulted in changing back to the original configuration in the plants of Fertiberia(Huelva) and BASF (Ludwigshafen). The main reasons for this were increased clogging in theequipment and increased maintenance cost [154, TWG on LVIC-AAF, 2006].When recycling warm air within AN/CAN production, safety issues should be taken intoconsideration [154, TWG on LVIC-AAF, 2006].EconomicsThe total installed cost for a warm air recycle system for a 100 tonnes per hour plant isestimated to be USD 600000 – 1000000. The economic justification for this option increasessignificantly if scrubber repair, upgrade, or replacement is already needed.The example plant achieves fuel savings of about EUR 61000 per year (based on a price of EUR0.14/m 3 of natural gas).Driving force for implementationCost benefits through fuel savings.References to literature and example plants[52, infoMil, 2001, 54, Snyder, 2003], AMFERT, Amsterdam, AMI, Linz308 Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers