Abstract
The paper describes the improved cooling circuit of compressed gas between the groups of compression stages at large industrial centrifugal compressor units, which makes it possible to save the energy required for compression due to subcooling of the gas to the temperature close to the ambient one in winter and to generate electric energy making use of the exhaust the heat in summer. Energy saving effect was calculated due to the use of liquid air separation products for cooling of compressed gases: air, oxygen and nitrogen. Thermodynamic calculation of costs for compression of technical gases for the full cycle of metallurgical production of steel was carried out for different types of drives of centrifugal compressors; the cycle included compression, air separation, blast furnaces operation, gaseous oxygen and nitrogen separation. Estimated specific energy consumption depends on cooling the compressed gas between groups of stages of compression in industrial centrifugal compressor units and the injection of liquid products of air separation in a stream of compressed gas with the type of compressor drives, for example the climatic conditions of OJSC "MMK" location.
Keywords
Energy saving, energy efficient scheme, centrifugal compressor, drive type, compression work, heat, intermediate cooling, organic Rankine cycle.
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