Thermodynamic Parametric Study of a Supercritical Powerplant

Vosough, Amir

doi:10.2514/1.60259

Cited by 1 publication

(5 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This occurs mainly because less energy enters the Rankine cycle, whereas, for case 1-2, this is also due to the decrease in the mass flow rate of the working fluid. The exergy loss factor of the pump was very small (between 0.06% and 0.07%), which is consistent to Vosough,14 whereas it decreased in case 1-2 due to the decrease of mass flow rate of the working fluid.…”

Section: Thermodynamic Analysis Results Of the Systemsupporting

confidence: 85%

“…In addition, the exergy loss characteristics and analysis results of the turbine, condenser, and pump in the Rankine cycle in cases 2-X are similar to those in cases 1-X ( Figure 9A,B). Overall, the exergy loss of the boiler was highest during fuel combustion, 14 second-highest in the heat transfer, and lowest for the flue gas; the addition of PV cells mainly reduced the exergy loss in the heat transfer. The cases 2-X with the fixed flue gas temperature maintained a small exergy loss in the flue gas and thus resulted in improved system efficiency.…”

Section: Thermodynamic Analysis Results Of the Systemmentioning

confidence: 96%

“…It is evident that the exergy loss factor of the boiler (about 60%) was much larger than that of the Rankine cycle (about 7%). 14 The exergy loss of the boiler was highest during fuel combustion, secondhighest in the heat transfer, and lowest for the flue gas.…”

Section: Thermodynamic Analysis Results Of the Systemmentioning

confidence: 99%

“…Overall, Figure 10A shows that lignite had the highest exergy loss factor in the boiler, followed by bituminous coal and anthracite. For the turbine, condenser, and F I G U R E 9 Exergy loss factor of system components as a function of photovoltaic (PV) cell ratio pump, the exergy loss factors were small, 14 and there were only slight differences between the three coals, which is attributed to the different input fuel exergy values of the different coals. The fuel chemical exergy, which is calculated using Equation (24), is largest for lignite, and its exergy loss during the combustion process is also the largest.…”

Section: Thermodynamic Analysis Results Of the Systemmentioning

confidence: 99%

“…1,13 As the basic principle of a thermal power plant, the vapor Rankine cycle is limited by the working fluid and the actual component efficiency; this causes a basic energy conversion efficiency of about 40%. 14 Previous studies have proposed several methods to improve the efficiency of the Rankine cycle, including thermal power system optimization (regeneration and reheat design 15,16 and multi-stage design 17 ), high-parameter boilers, 18,19 combination of multiple systems (such as gas-steam combined cycle 20 and a combination of Rankine cycle and refrigeration cycle 21 ), as well as waste heat utilization 22,23 and cogeneration. 24 In addition, researchers also tested different working fluids to improve the cycle performance, such as the Kalina cycle with ammonia-water mixed fluid 25,26 and the recently developed supercritical CO 2 thermal power cycle.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A novel flame energy grading conversion system: Preliminary experiment and thermodynamic parametric analysis

et al. 2019

View full text Add to dashboard Cite

Summary The focus of this study is to improve the efficiency of the thermal power cycle from the perspective of photo energy and thermal energy grading conversion. A new concept of combined radiation and heat engine model was proposed to establish a novel flame energy grading conversion system based on photovoltaic conversion and the Rankine cycle. From the perspective of energy utilization, the spectral radiative energy characteristics in oxy‐coal combustion were experimentally investigated, and a preliminary thermodynamic model of the new system was established based on the experimental results. Finally, energy and exergy analyses were conducted to determine the general characteristics of the proposed system and assess the improvements to the Rankine cycle. The results indicated that temperature was the main factor affecting the short‐waveband energy ratio. Compared with the Rankine cycle, the new flame energy grading conversion system improved the system efficiency by about 3.5%. The exergy analysis indicated that the proposed system reduced the exergy loss factor in the heat transfer of the boiler by about 3% to 6%. This study provides references for improving the thermal power cycle efficiency.

show abstract

Section: Thermodynamic Analysis Results Of the Systemsupporting

confidence: 85%

Section: Thermodynamic Analysis Results Of the Systemmentioning

confidence: 96%

Section: Thermodynamic Analysis Results Of the Systemmentioning

confidence: 99%

Section: Thermodynamic Analysis Results Of the Systemmentioning

confidence: 99%