The Experts below are selected from a list of 75 Experts worldwide ranked by ideXlab platform
Baohuai Zhang - One of the best experts on this subject based on the ideXlab platform.
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Performance simulation on NG/O2 combustion gas and steam mixture cycle with energy storage and CO2 capture
Applied Energy, 2017Co-Authors: Yaping Chen, Zilong Zhu, Xianzhi Mei, Shaobo Zhang, Baohuai ZhangAbstract:A novel combustion gas and steam mixture cycle (GSMC) power generation system was simulated and studied in this paper. The system integrates the technologies of NG/O2 combustion, energy storage, peak-shaving and CO2 capture with LNG/LO2 cold energy utilization, which has remarkable features such as high efficiency, low first/operation/maintenance costs, zero CO2 and NOx emission and massive off-peak power shifting. A calculation case is presented and the impacts of turbine inlet parameters, condensing pressure/Condenser Outlet Temperature and feedwater Temperature on the net electric efficiency excluding ASU and equivalent net electric efficiency as well as CO2 capture features are analyzed. The steam content in vapor phase of the Condenser Outlet is considered which requires more cooling capacity for CO2 capture. Under the conditions that the Condenser Outlet Temperature/condensing pressure is 30°C/30kPa and feedwater Temperature is 300°C, with fully CO2 capture, the net electric efficiency excluding ASU and equivalent net electric efficiency are 0.4386 and 0.4105 respectively with turbine inlet parameters of 600°C/30MPa, and they can reach 0.5327 and 0.5046 respectively with turbine inlet parameters of 1000°C/40MPa.
Susan Krumdieck - One of the best experts on this subject based on the ideXlab platform.
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An iterative method for modelling the air‐cooled organic Rankine cycle geothermal power plant
International Journal of Energy Research, 2011Co-Authors: M. Imroz Sohel, Mathieu Sellier, Larry Brackney, Susan KrumdieckAbstract:This work presents an iterative method for modelling the effect of ambient air Temperature on the air-cooled organic Rankine cycle. The ambient Temperature affects the Condenser performance, and hence the performance of the whole cycle, in two ways. First, changing the equilibrium pressure inside the Condenser, the turbine Outlet pressure and the turbine pressure ratio vary. Since the turbine pressure ratio is a major parameter in determining the power generated by a turbine, the plant output is directly affected. Second, changing the Condenser Outlet Temperature with ambient Temperature, the pump inlet and Outlet conditions are changed. Thus, the vapourizer equilibrium Temperature and pressure are influenced. The developed method iteratively seeks the equilibrium conditions for both the Condenser and vapourizer. Two case studies based on a real plant performance have been carried out to demonstrate the validity of the method. The developed method demonstrates robustness and converges regardless of the initial conditions allowed by the physical properties of the working fluid. This method is effective for cycles that use saturated vapour as well as superheated vapour under static or dynamic conditions with appropriate initial conditions and constraints. The developed method may be applied to any Rankine cycle with closed cycle operation. Copyright © 2010 John Wiley & Sons, Ltd.
Candeniz Seckin - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic analysis of a combined power/refrigeration cycle: Combination of Kalina cycle and ejector refrigeration cycle
Energy Conversion and Management, 2018Co-Authors: Candeniz SeckinAbstract:Abstract In the present study, a new power and refrigeration cycle is investigated which is a combination of a Kalina cycle and an ejector refrigeration cycle (ERC). In the proposed configuration of the combined cycle, an ejector refrigeration cycle is inserted into the Kalina cycle to recover heat from ammonia poor solution which leaves the separator at high Temperature/pressure and does not contribute to power generation in Kalina cycle Working fluid of the Kalina cycle and ERC are ammonia-water solution and R134a, respectively. The combined cycle is simulated by EES software and details of the applied mathematical model and developed simulation program are extensively reported. The effect of five key operational parameters of the combined cycle (i.e. turbine inlet pressure, turbine inlet Temperature, concentration of ammonia-water basic solution, Condenser Outlet Temperature and pressure of refrigerant in heat exchanger) on the combined cycle performance parameters (refrigeration capacity, power production, thermal efficiency, exergy of produced power, exergy of refrigeration and exergy efficiency) is analyzed and physical mechanisms behind the determined results are reported. Additionally, variation of performance parameters with heat exchanger pressure is examined with different refrigerants (R134a, R152a and R290) to determine the effect of refrigerants on system performance. The results show that thermal efficiency of the combined cycle increases with increasing turbine inlet Temperature and concentration of ammonia-water solution but decreases with rising Condenser Outlet Temperature and heat exchanger pressure. A maximum thermal efficiency point is determined in the analyzed range of the turbine inlet pressure. Exergy efficiency increases with rising turbine inlet pressure, turbine inlet Temperature and concentration of ammonia-water solution but decreases with increasing Condenser Outlet Temperature and heat exchanger pressure. Refrigeration capacity and thermal efficiency results of the combined cycle are the highest for the operation of ERC with R290 and the lowest with R134a. Exergy efficiency is the lowest for ERC operation with R290 and the highest with R134a.
Yaping Chen - One of the best experts on this subject based on the ideXlab platform.
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Performance simulation on NG/O2 combustion gas and steam mixture cycle with energy storage and CO2 capture
Applied Energy, 2017Co-Authors: Yaping Chen, Zilong Zhu, Xianzhi Mei, Shaobo Zhang, Baohuai ZhangAbstract:A novel combustion gas and steam mixture cycle (GSMC) power generation system was simulated and studied in this paper. The system integrates the technologies of NG/O2 combustion, energy storage, peak-shaving and CO2 capture with LNG/LO2 cold energy utilization, which has remarkable features such as high efficiency, low first/operation/maintenance costs, zero CO2 and NOx emission and massive off-peak power shifting. A calculation case is presented and the impacts of turbine inlet parameters, condensing pressure/Condenser Outlet Temperature and feedwater Temperature on the net electric efficiency excluding ASU and equivalent net electric efficiency as well as CO2 capture features are analyzed. The steam content in vapor phase of the Condenser Outlet is considered which requires more cooling capacity for CO2 capture. Under the conditions that the Condenser Outlet Temperature/condensing pressure is 30°C/30kPa and feedwater Temperature is 300°C, with fully CO2 capture, the net electric efficiency excluding ASU and equivalent net electric efficiency are 0.4386 and 0.4105 respectively with turbine inlet parameters of 600°C/30MPa, and they can reach 0.5327 and 0.5046 respectively with turbine inlet parameters of 1000°C/40MPa.
Zilong Zhu - One of the best experts on this subject based on the ideXlab platform.
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Analysis on full CO2 capture schemes in NG/O2 combustion gas and steam mixture cycle (GSMC)
Energy, 2020Co-Authors: Chen Yaping, Zilong Zhu, Shuxing ZhengAbstract:Abstract The nature gas and pure oxygen (NG/O2) combustion gas and steam mixture cycle (GSMC) is a novel power generation cycle using NG/O2 combustion product and circulation H2O as the turbine working medium, which can implement efficient power generation, CO2 capture and energy shifting. In GSMC, cold energy of liquefied natural gas (LNG) and liquefied oxygen (LO2) is used for CO2 capture. The CO2 capture schemes are analyzed to improve the CO2 capture as well as the system efficiency. The main means to increase the CO2 capture and extend CO2 full capture range include the reduction of CO2 liquefaction enthalpy drop and the conservation of cooling energy consumption in CO2/moisture separation. Lower efficiency is always a penalty of the full CO2 capture especially with higher Condenser Outlet Temperature. The optimal scheme is different under different conditions such as parameters of turbine inlet, cooling water, and CO2 liquefaction. At turbine inlet of 30MPa/1000 °C and Condenser Outlet of 18kPa/38 °C, the efficiency drop is 1.18% for the full CO2 capture of the improved scheme, while the CO2 capture ratio of the original GSMC scheme is less than 60%. The distinctive CO2 capture of GSMC is summarized as system indispensable, scheme optional and method promotable.
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Performance simulation on NG/O2 combustion gas and steam mixture cycle with energy storage and CO2 capture
Applied Energy, 2017Co-Authors: Yaping Chen, Zilong Zhu, Xianzhi Mei, Shaobo Zhang, Baohuai ZhangAbstract:A novel combustion gas and steam mixture cycle (GSMC) power generation system was simulated and studied in this paper. The system integrates the technologies of NG/O2 combustion, energy storage, peak-shaving and CO2 capture with LNG/LO2 cold energy utilization, which has remarkable features such as high efficiency, low first/operation/maintenance costs, zero CO2 and NOx emission and massive off-peak power shifting. A calculation case is presented and the impacts of turbine inlet parameters, condensing pressure/Condenser Outlet Temperature and feedwater Temperature on the net electric efficiency excluding ASU and equivalent net electric efficiency as well as CO2 capture features are analyzed. The steam content in vapor phase of the Condenser Outlet is considered which requires more cooling capacity for CO2 capture. Under the conditions that the Condenser Outlet Temperature/condensing pressure is 30°C/30kPa and feedwater Temperature is 300°C, with fully CO2 capture, the net electric efficiency excluding ASU and equivalent net electric efficiency are 0.4386 and 0.4105 respectively with turbine inlet parameters of 600°C/30MPa, and they can reach 0.5327 and 0.5046 respectively with turbine inlet parameters of 1000°C/40MPa.