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

Chapter7Achieved environmental benefits• reduced emissions to air. The purge air flow is a tiny fraction (in the order of 1 %) of theairflow typically required for a rotary or fluid bed cooler• for energy savings, see Table 7.9.per tonneproductRotary coolerFluid bed coolerPlate bankcooler3 kWh5 kWh0.6 kWhThe rotary cooler requires fairly large motors for the coolerdrive, the exhaust fan, and the scrubber circulation pumpThe fluid bed cooler requires even larger motors for theexhaust fan and the scrubber circulation pumpThe only motors needed are for a small cooling water pump,blower, and conveyorTable 7.9: Comparison of energy requirements for different product cooling systems[54, Snyder, 2003]Cross-media effectsCooling water: 280 – 4200 litre/minute [52, infoMil, 2001]200 – 300 m 3 /hour (BASF, Antwerp)150 m 3 /hour (AMI, Linz).The energy saving will be partially offset by the energy requirements for the internal coolingsystem and purge air drying/compression. For example, BASF (Antwerp) applies 10000m 3 /hour, AMI (Linz) applies 300 m 3 /hour dried purge air [154, TWG on LVIC-AAF, 2006].The fines contained in the product are not removed in a plate bank cooler in contrast to the finesremoval in the drying drum and fluid bed cooler [154, TWG on LVIC-AAF, 2006].Operational data[52, infoMil, 2001]:Typical throughput:Approximate heat capacity:Instrument air:5 – 60 tonnes/hour209300 – 3140000 kJ/hour10 litre/minute.The cooling water inlet should have a 10 ºC lower temperature than the targeted temperature ofthe material to be cooled.ApplicabilityGenerally applicable. The plate bank cooler shows a compact design; the requirement for a 100tonne per hour unit was approximately 1.8 m square by 9 m high. The tall elevation was due totwo stages of plate banks with one immediately above the other. In addition, this type of coolerdoes not require nearly the same amount of ancillary equipment. The product is handled gentlyLarge Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers 305