Abstract

An energy optimization of production of a thermoplastic material, polyamid-6, i.e. nylon-6, using boiler flue gases heat recovery is presented. Energy and environmental studies show an increase of process efficiency simultaneously with a decrease of thermal pollution. If the feed water is heated with flue gases, the fuel consumption is reduced by about 13%, while the boiler outlet flue gases temperature decreases from 232°C to 55°C. Using an air preheater for combustion air preheating, 7.9% of the fuel will be saved, and at the same time, the atmospheric thermal pollution is diminished because the exhaust flue gases temperature becomes 62°C instead of 232°C. The combination of feed water and air preheating shows fuel savings of 13.6%, and the outlet flue gases temperature is reduced to 29.7°C.

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