Steam-ejector refrigerating systems in energy saving technologies of ammonia production
DOI:
https://doi.org/10.15587/1729-4061.2013.14827Keywords:
Production of ammonia, energy efficiency, heat disposal, steam ejector cooling systemAbstract
In the context of the general problem of increasing the energy efficiency of the units of ammonia synthesis the results of research and engineering aimed at reduction of energy-intensity of synthesis were presented. The analysis of the state and impact of condensation stages of productional ammonia on the operating costs of production was carried out. A possibility of improvement the energy efficiency by exclusion from the scheme of the most energy-intensive ammonia turbo compressor refrigerating unit and reduction of the consumption of natural gas in block of compression of section of synthesis was substantiated. The scientific problem of disposal of low-potential heat with temperatures lower than 100 º C in a steam ejector refrigerating units by application of a low-boiling cooling agent – ammonia, which was irrevocably lost in the air coolers of steam generation section with power consumption was solved. By mathematical modeling, the synthesis of energy-efficient hardware-design process of condensation systems was carried out, providing in high temperature the redistribution of generated refrigeration energy in condensation units with its increase at the stage of primary condensation due to the inclusion of steam ejector refrigeration unit. The usage of the proposed power technological design permits to reduce the specific consumption of electricity and natural gas on average by 20 kW • h/t.NH3 and 3.67 m3/t.NH3.
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