Rankine Cycle Efficiency under Maximum Power Generation Condition as Applied to Low-Temperature Power Plant Using a Cryo
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RESEARCH, DESIGN, NUMERICAL ANALYSES, AND OPERATING EXPERIENCE CRYOGENIC EQUIPMENT, PRODUCTION AND APPLICATION OF INDUSTRIAL GASES. VACUUM TECHNOLOGY CRYOGENIC EQUIPMENT AND TECHNOLOGIES RANKINE CYCLE EFFICIENCY UNDER MAXIMUM POWER GENERATION CONDITION AS APPLIED TO LOW-TEMPERATURE POWER PLANT USING A CRYOPRODUCT AS THE WORKING SUBSTANCE A. I. Dovgyallo,1 D. A. Uglanov,1 K. E. Vorotyntseva,1 and I. A. Arkharov2
UDC 621.5
The “carnotized” Rankine cycle efficiency is studied under conditions of maximum power generation in a low-temperature power plant using a cryoproduct as the working substance. A method is proposed for evaluating the thermodynamic efficiency of the cycles that make efficient use of cold energy. A gener-
alized thermal efficiency equation, ηtN = 1 − (TC /Th ) m , is derived for low-temperature cycles, which
can be used to increase the accuracy of determination of the efficiency and the amount of additional power generation by 20–40 %. The amount of power generated in the low-temperature power plant is estimated based on the criterion of maximum performance. This method of calculation of the characteristics of low-temperature cycles is applicable for any energy generating systems. It is shown that utilization of cold energy of a cryogenic fuel (liquefied natural gas) is a promising direction of development of the idea of cogeneration and trigeneration in power plants. Keywords: cold energy of cryoproduct, liquefied natural gas (LNG), efficiency of “carnotized” cycle, maximum power generation condition, generalized thermal efficiency, additional power, efficiency, mathematical analysis, “carnotized” cycle.
Investigations in the domain of utilization of cold energy of cryogenic liquids are crucial because of the growing volumes of cryogenic liquids production and development of technologies of their utilization, especially of those that utilize the energy potential of cryogenic liquids (in the form of energy previously expended for liquefaction [1]), and also of the general trend of energy saving. 1
S. P. Korolev Samara National Research University (Samarskii Natsional’nyi Issledovatel’skii Universitet im. S. P. Koroleva), Russia; e-mail: [email protected]. 2 N. É. Bauman Moscow State Technical University (Moskovskii Gosudarstvennyi Tekhnicheskii Universitet im. N. É. Baumana), Russia; e-mail: [email protected]. Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, Vol. 56, No. 6, pp. 3–7, June, 2020. 0009-2355/20/0506–0423
© 2020
Springer Science+Business Media, LLC
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A. I. DOVGYALLO, D. A. UGLANOV, K. E. VOROTYNTSEVA,
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I. A. ARKHAROV
Fig. 1. T−S diagram of thermodynamic cycle of a steam power plant where cold energy of a cryoproduct is utilized. For implementing the technology of recovery of the energy expended for cooling of the cryoproduct, it is essential to have a direct-cycle heat engine that utilizes the cryogenic liquid itself as the lower heat source and the surrounding medium (or other natural or industrial heat wastes) as the higher heat source. One of the vari
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