The performance of a marine gas turbine intercooler operating in wet condition was evaluated.The intercooler was a cross-flow plate-fin heat exchanger that used air and pure water as its working fluids at the hot and ...The performance of a marine gas turbine intercooler operating in wet condition was evaluated.The intercooler was a cross-flow plate-fin heat exchanger that used air and pure water as its working fluids at the hot and cold sides,respectively.The heat transfer performance and the water vapor condensation were investigated for a relative humidity of the inlet air that reached 100% during warship cruise.The condensation of the water vapors increased the hot side outlet temperature by a certain amount,which could in turn influence the performance of the compressor downstream.The condensate film thickness and the void fraction were calculated based on an annular two-phase flow model.It is found that water vapor condensation in hot flow channel increases the outlet temperature with a maximum value of 7.3℃ in the case of 100% relative humidity.The calculated liquid film thickness reaches a maximum value of 4μm,which indicates negligible thermal resistance to heat transfer.The results of liquid film thicknesses also provide a qualitative prediction of the diameter distribution of the condensate water droplets.展开更多
The Maisotsenko gas turbine cycle(MGTC),integrated with a combined aftercooling and regenerative saturator,has the potential to challenge traditional wet air turbine cycles.However,its large water consumption limits i...The Maisotsenko gas turbine cycle(MGTC),integrated with a combined aftercooling and regenerative saturator,has the potential to challenge traditional wet air turbine cycles.However,its large water consumption limits its applicability.By integrating an intercooler and Organic Rankine Cycle(ORC) into the MGTC,this study proposes a comprehensive design of IMGT-ORC,which can adjust the water capacity of the saturator,and utilize the sensible heat of cooling water and the latent heat of evaporation in exhaust gas to achieve water and energy saving.Firstly,a sensitivity analysis was conducted to investigate the effects of various parameter variations on thermodynamic and economic indicators under different temperature drop ratios.Subsequently,a multi-objective optimization approach was employed to seek for an optimal balance between economic and environmental benefits.The results showed that either the intercooler or ORC integration can improve the thermal efficiency of the system.In the case of joint setting,the thermal efficiency is relatively increased by 6.89% and the water consumption is relatively reduced by 89.07%.Moreover,although high temperature drop ratio reduces the output of ORC,it enhances the energy efficiency of the top cycle.In terms of cost control,ORC integration may increase the levelized cost of electricity(LCOE) slightly,while the intercooler integration helps offset the increase.Finally,the optimization results show that using the optimal parameter combination can reduce the annual equivalent carbon dioxide emissions by 11 600 tons and the annual water consumption of the power plant by 251 027 tons.展开更多
Current study deals with performance evaluation of the solar power tower driven recompression with main com-pressor intercooling(RMCIC)supercritical CO_(2)cycle incorporating the parallel double evaporator organic Ran...Current study deals with performance evaluation of the solar power tower driven recompression with main com-pressor intercooling(RMCIC)supercritical CO_(2)cycle incorporating the parallel double evaporator organic Rank-ine cycle(PDORC)as bottoming cycle using low global warming potential fluids to reduce the global warming and ozone depletion.Using the PDORC instead of the basic organic Rankine cycle,waste heat from the intercooler and cycle exhaust were recovered simultaneously to enhance performance of the standalone RMCIC cycle.Exergy,thermal efficiency,efficiency improvement and waste recovery ratio were considered as performance parameters.A computer program was made in engineering equation solver to simulate the model.It was concluded that by the incorporation of the PDORC thermal efficiency was improved by 7-8%at reference conditions.Maximum combined cycle’s thermal and exergy efficiency were found 54.42%and 80.39%respectively of 0.95 kW/m^(2)of solar irradiation based on R1243zf working fluid.Among the results it was also found that maximum waste heat was recovered by the R1243zf about 54.22%at 0.95 effectiveness of low temperature recuperator.展开更多
文摘The performance of a marine gas turbine intercooler operating in wet condition was evaluated.The intercooler was a cross-flow plate-fin heat exchanger that used air and pure water as its working fluids at the hot and cold sides,respectively.The heat transfer performance and the water vapor condensation were investigated for a relative humidity of the inlet air that reached 100% during warship cruise.The condensation of the water vapors increased the hot side outlet temperature by a certain amount,which could in turn influence the performance of the compressor downstream.The condensate film thickness and the void fraction were calculated based on an annular two-phase flow model.It is found that water vapor condensation in hot flow channel increases the outlet temperature with a maximum value of 7.3℃ in the case of 100% relative humidity.The calculated liquid film thickness reaches a maximum value of 4μm,which indicates negligible thermal resistance to heat transfer.The results of liquid film thicknesses also provide a qualitative prediction of the diameter distribution of the condensate water droplets.
基金financial support from the fund of the State Key Laboratory of Long-Life High Temperature Materials (DEC8300CG202210279EE280285)the Fundamental Research Funds for the Central Universities (501XTCX2023146001)。
文摘The Maisotsenko gas turbine cycle(MGTC),integrated with a combined aftercooling and regenerative saturator,has the potential to challenge traditional wet air turbine cycles.However,its large water consumption limits its applicability.By integrating an intercooler and Organic Rankine Cycle(ORC) into the MGTC,this study proposes a comprehensive design of IMGT-ORC,which can adjust the water capacity of the saturator,and utilize the sensible heat of cooling water and the latent heat of evaporation in exhaust gas to achieve water and energy saving.Firstly,a sensitivity analysis was conducted to investigate the effects of various parameter variations on thermodynamic and economic indicators under different temperature drop ratios.Subsequently,a multi-objective optimization approach was employed to seek for an optimal balance between economic and environmental benefits.The results showed that either the intercooler or ORC integration can improve the thermal efficiency of the system.In the case of joint setting,the thermal efficiency is relatively increased by 6.89% and the water consumption is relatively reduced by 89.07%.Moreover,although high temperature drop ratio reduces the output of ORC,it enhances the energy efficiency of the top cycle.In terms of cost control,ORC integration may increase the levelized cost of electricity(LCOE) slightly,while the intercooler integration helps offset the increase.Finally,the optimization results show that using the optimal parameter combination can reduce the annual equivalent carbon dioxide emissions by 11 600 tons and the annual water consumption of the power plant by 251 027 tons.
文摘Current study deals with performance evaluation of the solar power tower driven recompression with main com-pressor intercooling(RMCIC)supercritical CO_(2)cycle incorporating the parallel double evaporator organic Rank-ine cycle(PDORC)as bottoming cycle using low global warming potential fluids to reduce the global warming and ozone depletion.Using the PDORC instead of the basic organic Rankine cycle,waste heat from the intercooler and cycle exhaust were recovered simultaneously to enhance performance of the standalone RMCIC cycle.Exergy,thermal efficiency,efficiency improvement and waste recovery ratio were considered as performance parameters.A computer program was made in engineering equation solver to simulate the model.It was concluded that by the incorporation of the PDORC thermal efficiency was improved by 7-8%at reference conditions.Maximum combined cycle’s thermal and exergy efficiency were found 54.42%and 80.39%respectively of 0.95 kW/m^(2)of solar irradiation based on R1243zf working fluid.Among the results it was also found that maximum waste heat was recovered by the R1243zf about 54.22%at 0.95 effectiveness of low temperature recuperator.
