Calculation of an Upgraded Rankine Cycle with Lithium Bromide Solution As a Working Flow

Increasing the energy efficiency of thermal power plants operating according to the Rankine cycle is one of the priority tasks of the Russian energy sector. Despite a significant amount of scientific research, the efficiency of installations of this type still remains low. As a technological solutio...

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Bibliographic Details
Published in:Thermal engineering 2024-02, Vol.71 (2), p.97-107
Main Authors: Dobrydnev, D. V., Papin, V. V., Bezuglov, R. V., Efimov, N. N., D’yakonov, E. M., Shmakov, A. S.
Format: Article
Language:English
Subjects:
Absorption
Aqueous solutions
Combined-Cycle Power Plants and Their Auxiliary Equipment
Energy consumption
Energy efficiency
Energy industry
Engineering
Engineering Thermodynamics
Fuel consumption
Gas-Turbine
Heat and Mass Transfer
Lithium
Mathematical analysis
Modernization
Rankine cycle
Steam electric power generation
Steam-Turbine
Thermal power plants
Thermodynamic efficiency
Turbines
Water vapor
Working fluids
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Summary:Increasing the energy efficiency of thermal power plants operating according to the Rankine cycle is one of the priority tasks of the Russian energy sector. Despite a significant amount of scientific research, the efficiency of installations of this type still remains low. As a technological solution to increase their efficiency, the authors consider a modernized Rankine cycle in which an aqueous solution of lithium bromide is used as a working fluid, the condensation process of exhaust steam after the turbine is replaced by the process of its absorption, and the second working fluid is an absorbent. The features of the functioning of such a cycle are outlined, and the methodology for its calculation is presented. Studies have shown that the use of lithium bromide solution can reduce the steam pressure after the turbine and increase the useful heat drop as well as the degree of cycle filling. In addition, when the heat of the solution returned from the boiler is regenerated, the average temperature of the heat supply to the cycle increases, which also increases its thermal efficiency compared to the traditional circuit. The energy efficiency of the modernized cycle was analyzed and compared with the traditional Rankine cycle on water vapor. Calculations have shown that the use of a modernized cycle allows increasing thermal efficiency by an average of 1–2% compared to the traditional solution. The indicators characteristic of both steam power and absorption cycles were studied, and graphical dependences of efficiency on the main parameters were derived. The economic effect of using the modernized scheme is to reduce fuel consumption and emissions of harmful substances into the atmosphere in proportion to the reduction in fuel consumption.
ISSN:0040-6015
1555-6301
DOI:10.1134/S0040601524020034