Use of a turboexpander in steam power units for heat energy recovery in heat supply systems

Sadykov, R. A.; Daminov, A. Z.; Solomin, I. N.; Futin, V. A.

doi:10.1134/s0040601516030113

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…Published papers consider many refrigerants for the ORC application: RC318, R600a R32, R407C, R290, R500, R134a and R152, R245fa, R245ca, R141b, R11, R123, R113, etc. [3,7,11,19,20]. Depending on various parameters, different organic fluids in similar cycles with initial parameters show different efficiency values.…”

Section: Low-boiling-point Fluid Selectionmentioning

confidence: 99%

“…The gas turbine (GT) exhaust, steam turbine (ST) and Combined Cycle (CC) facilities for flue gas and the back-pressure ST exhaust steam have considerable thermal powers [1,2]. The temperature range of LHP sources typical for the power industry is 50-350 • C [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Another use of ORC is to use the low-potential heat from different sources presented by the water stream. Sadykov et al [3] disclosed the utilization of the boiler facility exit heat for the municipal heat supply. The working fluid and the turbine inlet temperature are R245fa and 127 • C, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Optimization of Low-Temperature Cycles for the Power Industry

Kindra

Rogalev

et al. 2022

Energies

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The fuel price increase and severe environmental regulations determine energy-saving importance. Useful utilization of low-potential heat sources with 300–400 °С temperature becomes topical. The application of low-temperature power production facilities operating low-boiling heat carriers could be a solution to this problem. A comparative parametric study of a number of heat carriers resulted in a choice of the most promising fluids that are not expensive, have low toxicity and flammability, low ozone depletion and low global warming potential. These heat carriers are considered for application in simple power production cycles with and without regeneration. The main parameters were optimized at the initial temperatures of 323.15–623.15 K. The cycle without regeneration has a maximal net efficiency of 29.34% using the water at an initial temperature of 623.15 K. The regenerative cycle at a temperature below 490 K has its maximal efficiency using a water heat carrier, and at a higher temperature above 490 K with R236ea. The cycle with R236ea at 623.15 K has an electrical net efficiency of 33.30%. Using a water heat carrier, the maximal efficiency can be reached at pressures below 5 MPa for both cycles. Among the organic heat carriers, the minimal optimal initial pressure of a simple cycle is reached with the R236ea heat carrier below 45 MPa without regeneration and below 15 MPa with regeneration. Therefore when utilizing the latent heat with temperatures above 500 K R134a, R236ea and R124 are the most promising organic fluids. Such conditions could be obtained using different industrial sources with water condensation at elevated pressures.

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Section: Low-boiling-point Fluid Selectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Optimization of Low-Temperature Cycles for the Power Industry

Kindra

Rogalev

et al. 2022

Energies

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“…Для утилизации низкопотенциальных источников энергии (например, тепловых отходов предприятий, выхлопных газов газотурбинной установки (ГТУ), продуктов сжигания биотоплива и других низкопотенциальных топлив) все чаще используются турбоустановки на низкокипящих рабочих телах (НКРТ) [1,[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. В случае когда рабочее тело имеет более низкую, чем у воды, температуру кипения, его испарение происходит при относи-тельно невысокой температуре, что и позволяет утилизировать низкопотенциальную энергию.…”

Section: Introductionunclassified

Trigeneration Turbine Units Based on Low Boiling Working Fluids

Ovsyannik

Kliuchinski

2022

Izv. vysh. ucheb

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A program that allows modeling, thermodynamically optimizing and performing exergetic analysis of more than a hundred different variations of the schemes of trigeneration turbine units based on low-boiling working fluids. With the aid of the program that had been developed, an exergetic analysis of six schemes of trigeneration turbine units on the organic Rankine cycle was performed, viz. on an overheated steam with a steam compression refrigeration unit; with an intermediate overheating of the working fluid and a steam compression refrigeration unit; on an overheated steam with a refrigeration unit with carbon dioxide production; with an intermediate overheating of the working fluid and a refrigeration unit with carbon dioxide production; on an overheated steam with a refrigeration unit with production carbon dioxide and cooling of the turbine condenser with liquid carbon dioxide; with intermediate overheating of the working fluid, a refrigeration unit with carbon dioxide production and cooling of the turbine unit condenser with liquid carbon dioxide. A gas turbine unit was used as an energy source for the above-mentioned schemes. The possibility of using the resulting liquid carbon dioxide to cool the condenser of a turbine unit on an organic Rankine cycle has been studied. A comparative analysis of two methods of obtaining cold (using a steam compression refrigeration unit and a refrigeration unit with carbon dioxide production) for use in trigeneration schemes has been carried out. The research was based on the method of exergetic analysis, the results of which are presented in the form of enlarged Grassmann – Shargut diagrams. A technical and economic analysis of the use of intermediate overheating in the organic Rankine cycle has been carried out, ozone-safe freon R245FA was used as the working fluid. Recommendations for the application of the studied trigeneration schemes on the organic Rankine cycle are formulated.

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