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

Chapter 99.4.2 Recovery of residual heat for chilling process waterDescriptionLarge volumes of contaminated low temperature (125 – 130 ºC) steam are generated during themanufacture of AN. Some of this steam is discharged into the air.However, residual low temperature heat can be used to chill water, using a LiBr/H 2 O absorptioncooler. In the example plant, the chilled water was used to cool down air for product cooling.Achieved environmental benefits• reduction of energy consumption.Cross-media effectsEnergy consumption for the pumps.Operational data• heat source: process steam• process steam pressure: 180 kPa• process steam flow: 2.77 kg/kWh• concentrator, number of passes: 1• cooling power: 2019.05 kW• power consumption:o system pumps: 11.19 kWo chilled water pump: 88 kWo condensate pump: 14 kWo cooling water pump: 57 kW.ApplicabilityAbsorption cooling processes are widely used in industry. The application in the fertiliserindustry is particularly interesting, where there is no consumer of low pressure NH 3 available. Itis more profitable than a conventional ammonia compression refrigeration system.EconomicsInvestment: approximately EUR 900000.Driving force for implementationPlant modernisation and cost benefits.References to literature and example plants[52, infoMil, 2001, 152, Galindo and Cortón, 1998]376 Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers