Abstract
Analysis of the evaporator of the absorption refrigerating secondary condensation unit of ammonia production was performed. The need to minimize the temperature mode of operation of the evaporator, which provides for energy efficiency in ammonia production by decreasing natural gas consumption was substantiated. Statistical processing of experimental data with assessment of the quality of obtained information was performed. Identification of the heat exchange process of the evaporator was performed and the equation for numerical evaluation of uncertainty of coefficients of thermal efficiency, heat transfer and condensation thermal resistance was obtained. According to the results of statistical modeling of the primary condensation unit, the equation for numerical evaluation of uncertainty of ammonia concentration in circulating gas at the evaporator inlet. The authors proved the possibility of its application for identification and mathematical modeling of heat exchange process at existing relationship of ammonia concentration in the circulating gas at the evaporator inlet and condensation thermal resistance. Algorithmic support of numerical evaluation of uncertainties and calculation of target indicators of the evaporator’s efficiency was created. The technical structure of the automated system for identification and timely obtaining of the mathematical model of the evaporator, which is adapted to the existing information system of the industrial ammonia synthesis unit, was developed.
Highlights
One of the main products of chemical industry is synthetic ammonia
As well as the large amount of arable fertile land, ammonia and fertilizers in Ukraine will always be a strategic commodity that determines the economic security of the state
Almost all modern units for ammonia synthesis, including those operating in Ukraine, are complex energy-technological complexes with capacity of 450 thousand tons per year, with many branches and interrelations between them [2]
Summary
One of the main products of chemical industry is synthetic ammonia. A continuous increase in the manufacturing of this product is caused by the need to improve the yield of crops through the introduction of nitrogen-containing fertilizers into soil. Almost all modern units for ammonia synthesis, including those operating in Ukraine, are complex energy-technological complexes with capacity of 450 thousand tons per year, with many branches and interrelations between them [2] Under such circumstances, even a slight change in the values of technological parameters in a separate unit or at a facility may cause significant economic losses due to the impact of external disturbances. AM-1360, operating in Ukraine, is the secondary condensation unit In this unit, the circulating gas (CG) is cooled in the evaporators of the absorption-refrigeration units (ARU), while the regeneration of cold and separation of condensed ammonia occurs in the condensation column. That is why minimization of the CG cooling temperature mode in evaporators of ARU through creation of high-quality automated adaptive system of optimal control becomes especially relevant for improving energy efficiency of ammonia production
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