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学者姓名:严俊杰

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< Page ,Total 41 >
Experimental and Numerical Analysis on the Internal Flow of Supersonic Ejector Under Different Working Modes EI CPCI-S SCIE Scopus
会议论文 | 2018 , 39 (7-8) , 700-710 | 3rd International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control (IWHT)
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Abstract :

Supersonic ejectors involve very complex phenomena such as interaction between supersonic and subsonic flows, shock trains, instabilities, which strongly influences the performance of supersonic ejector. In this study, the static pressure distribution along the ejector wall and Mach number distribution along the axis are used to investigate the internal flow field of supersonic ejector. Results indicate that when the back pressure is much less than the critical back pressure, there are two series of shock trains, and the change of the back pressure will not affect the flow field before the effective area section, so the entrainment ratio would remain constant. The second shock train moves further upstream and is combined with the first shock train to form a single shock train as the back pressure rises. When the back pressure is greater than the critical back pressure, the position of the shock train, the static pressure at its upstream and the entrainment ratio, will be affected. The effective area section in the mixing tube is obtained. The effective area section position moves downstream with the increase of the primary flow pressure, while it moves upstream with the increase of the secondary flow pressure. The entrainment ratio shows inversely proportional relationship with the effective section position. Besides, the first shock train length increases with the increase of primary flow pressure or secondary flow pressure. The critical back pressure represents direct proportional relationship to the first shock train length.

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GB/T 7714 Chen, Weixiong , Xue, Kangkang , Chen, Huiqiang et al. Experimental and Numerical Analysis on the Internal Flow of Supersonic Ejector Under Different Working Modes [C] . 2018 : 700-710 .
MLA Chen, Weixiong et al. "Experimental and Numerical Analysis on the Internal Flow of Supersonic Ejector Under Different Working Modes" . (2018) : 700-710 .
APA Chen, Weixiong , Xue, Kangkang , Chen, Huiqiang , Chong, Daotong , Yan, Junjie . Experimental and Numerical Analysis on the Internal Flow of Supersonic Ejector Under Different Working Modes . (2018) : 700-710 .
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Quantitative Analysis of Unburned Carbon in Fly Ash by Laser-induced Breakdown Spectroscopy EI
期刊论文 | 2018 , 47 (8) | Guangzi Xuebao/Acta Photonica Sinica
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Abstract :

To verify the ability of LIBS to measure the change of carbon content in fly ash, in this study, 24 samples with different carbon content were obtained by mixing pulverized coal and fly ash in a certain proportion. Spectra of these samples from LIBS were studied in different delay time. The emission intensity ratio of IMg1/IMg2 decreases with the increase of delay time. The emission intensity ratio of fly ash samples is obviously higher than that of other samples mixed with pulverized coal. The emission intensity ratio of IAl/ISi1 decreases with the increase of IMg1/IMg2. The addition of pulverized coal in the fly ash sample has a significant influence on the temperature change of plasma. By introducing the method of multivariate analysis, the ratios of spectral lines intensity of elements such as C, Al, Mg, Ca, Fe to that of Si element were calculated as the independent variable of multivariate regression analysis, and the concentration of carbon element was taken as dependent variable, and the regression equation under different delay time was established. The results showed that the errors between the predicted values and the reference values based on the regression model were within 9%. © 2018, Science Press. All right reserved.

Keyword :

Delay Time Emission intensity ratio Independent variables Multi variate analysis Multiple regressions Multivariate regression analysis Temperature changes Unburned carbon in fly ashes

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GB/T 7714 Hu, Ruo-Mu , Wang, Zhen-Zhen , Liu, Ren-Wei et al. Quantitative Analysis of Unburned Carbon in Fly Ash by Laser-induced Breakdown Spectroscopy [J]. | Guangzi Xuebao/Acta Photonica Sinica , 2018 , 47 (8) .
MLA Hu, Ruo-Mu et al. "Quantitative Analysis of Unburned Carbon in Fly Ash by Laser-induced Breakdown Spectroscopy" . | Guangzi Xuebao/Acta Photonica Sinica 47 . 8 (2018) .
APA Hu, Ruo-Mu , Wang, Zhen-Zhen , Liu, Ren-Wei , Zhou, Wang-Zheng , Liu, Ji-Ping , Yan, Jun-Jie et al. Quantitative Analysis of Unburned Carbon in Fly Ash by Laser-induced Breakdown Spectroscopy . | Guangzi Xuebao/Acta Photonica Sinica , 2018 , 47 (8) .
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Exergy analysis of centered water nozzle steam-water injector EI SCIE Scopus
期刊论文 | 2018 , 94 , 77-88 | EXPERIMENTAL THERMAL AND FLUID SCIENCE
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Abstract :

A steam-water injector (SI), which is a passive jet pump, has been widely used in various industries. In the present work, exergy analysis models of a centered water nozzle SI were developed based on experiments to evaluate the performance of SI. The thermodynamic perfect degree of SI was found to be not so bad, and exergy efficiency was within the range of 18%-45%. In general, SI is used to work as a pump. However, exergy analysis can only evaluate the thermodynamic perfect degree of SI, but cannot evaluate its lifting-pressure performance. Therefore, thermo-mechanical exergy was divided into temperature-based exergy and pressure-based exergy in the present work, and the pressure-based exergy analysis was introduced. Such analysis was determined to be more reasonable than exergy analysis for a passive jet pump and helpful for achieving optimal SI design. Moreover, the effects of physical and geometric parameters on exergy efficiency and pressure-based exergy efficiency were investigated experimentally, and several optimal values for these geometric parameters were found. Finally, the distributions of exergy losses in separate parts of SI, particularly inevitable exergy losses, were evaluated. These analyses will be helpful in eliminating the effects of inevitable factors and in identifying the key factor, thereby considerably improving SI performance.

Keyword :

Pressure-based exergy analysis Inevitable exergy losses Steam-water injector Exergy analysis

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GB/T 7714 Li, Wenjun , Liu, Ming , Yan, Junjie et al. Exergy analysis of centered water nozzle steam-water injector [J]. | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 94 : 77-88 .
MLA Li, Wenjun et al. "Exergy analysis of centered water nozzle steam-water injector" . | EXPERIMENTAL THERMAL AND FLUID SCIENCE 94 (2018) : 77-88 .
APA Li, Wenjun , Liu, Ming , Yan, Junjie , Wang, Jinshi , Chong, Daotong . Exergy analysis of centered water nozzle steam-water injector . | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 94 , 77-88 .
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Numerical investigation on the effects of steam and water parameters on steam jet condensation through a double-hole nozzle EI SCIE Scopus
期刊论文 | 2018 , 126 , 831-842 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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Abstract :

Steam jet condensation through multi-hole nozzles in a pressure relief pool is important for the design and safe operation of a nuclear reactor system. In this study, stable steam jet condensation through a double-hole nozzle was investigated at different water temperatures and steam pressures by CFD method. Simulation results indicated that the shape of steam cavity changed from conical to ellipsoidal with an increase in water temperature and steam pressure, and steam jet length gradually increased. Meanwhile, the interaction between two steam cavities was enhanced and they even merged under certain conditions. Expansion and compression waves were found by analyzing the thermal hydraulic parameters along the hole centerline. Water temperature and steam pressure exerted different effects on the intensity of expansion/compression waves and the positions of maximum expansion/compression. Finally, thermal hydraulic parameters along the nozzle centerline were analyzed. Steam volume fraction, temperature, and velocity initially increased and then decreased as axial distance increased, which appeared as evident peaks under the present conditions. When water temperature and steam pressure increased, the peak values of steam volume fraction, temperature, and velocity gradually increased and their positions moved downstream. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Thermal hydraulic parameters Condensation Double-hole nozzle Water temperature Steam pressure

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GB/T 7714 Wang, Lutao , Yue, Xiaoyu , Zhao, Quanbin et al. Numerical investigation on the effects of steam and water parameters on steam jet condensation through a double-hole nozzle [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 126 : 831-842 .
MLA Wang, Lutao et al. "Numerical investigation on the effects of steam and water parameters on steam jet condensation through a double-hole nozzle" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 126 (2018) : 831-842 .
APA Wang, Lutao , Yue, Xiaoyu , Zhao, Quanbin , Chong, Daotong , Yan, Junjie . Numerical investigation on the effects of steam and water parameters on steam jet condensation through a double-hole nozzle . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 126 , 831-842 .
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Experimental investigation on the phenomenon of steam condensation induced water hammer in a horizontal pipe EI SCIE Scopus
期刊论文 | 2018 , 91 , 451-458 | EXPERIMENTAL THERMAL AND FLUID SCIENCE
WoS CC Cited Count: 3
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Abstract :

The condensation induced water hammer (CIWH) phenomenon may cause serious damage to the pipes and related system, which often occurs during the steam-water direct contact condensation process. In this paper, an experimental investigation was performed to study CIWH phenomenon caused by steam-water direct contact condensation in a horizontal pipe. The entire CIWH process was captured by a high speed video camera and its pressure fluctuation was synchronously measured. Four typical flow patterns were observed during CIWH process: stratification flow, wave flow, slug flow and bubble collapse. Bubble collapse would generate a high pressure peak. Based on different variations of steam-water phase interface and pressure fluctuation signals, three types of CIWH were defined: non-periodic CIWH, periodic CIWH and no CIWH. A CIWH region map was given considering the effect of steam mass flux and water temperature. In periodic CIWH region, the generation frequency of CIWH was found to range from 0.19 Hz to 0.39 Hz, which decreased with the rise of steam mass flux and water temperature. A dimensionless correlation was obtained to predict Strouhal number of CIWH generation frequency. Predicted values corresponded well to the experimental data with the deviation in the range of -16% to +23%.

Keyword :

Generation frequency CIWH Horizontal pipe Region map Dimensionless correlation

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GB/T 7714 Wang, Lutao , Yue, Xiaoyu , Chong, Daotong et al. Experimental investigation on the phenomenon of steam condensation induced water hammer in a horizontal pipe [J]. | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 91 : 451-458 .
MLA Wang, Lutao et al. "Experimental investigation on the phenomenon of steam condensation induced water hammer in a horizontal pipe" . | EXPERIMENTAL THERMAL AND FLUID SCIENCE 91 (2018) : 451-458 .
APA Wang, Lutao , Yue, Xiaoyu , Chong, Daotong , Chen, Weixiong , Yan, Junjie . Experimental investigation on the phenomenon of steam condensation induced water hammer in a horizontal pipe . | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 91 , 451-458 .
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Numerical simulation of vortex in residual heat removal system during mid-loop operation EI SCIE Scopus
期刊论文 | 2018 , 337 , 428-438 | NUCLEAR ENGINEERING AND DESIGN
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Abstract :

Free surface vortex, especially in a pattern of full air core vortex, causes serious security problems in the residual heat removal system. Vortex in a T-junction pipe system was numerically investigated under the premise that the simulation results are in agreement with the experimental results. First, four typical states were obtained in the formation and evolution process of vortex, namely, surface dimple, critical submergence state, air entrainment vortex state, and large air entrainment state. With increasing Froude (Fr) number, the time from an initiate flow field to the critical submergence state decreased, and the time interval between critical submergence state and large air entrainment state increased. Finally, the variation law of vortex intensity was analyzed during the evolution process. The vortex intensity initially increased with time and reached its maximum value and then decreased until it reached a minimum value before the large air entrainment state. With the increase of Fr, the maximum values of vortex intensity gradually increased.

Keyword :

Vortex Residual heat removal system Air entrainment Critical submergence

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GB/T 7714 Song, Shilin , Zhao, Quanbin , Chong, Daotong et al. Numerical simulation of vortex in residual heat removal system during mid-loop operation [J]. | NUCLEAR ENGINEERING AND DESIGN , 2018 , 337 : 428-438 .
MLA Song, Shilin et al. "Numerical simulation of vortex in residual heat removal system during mid-loop operation" . | NUCLEAR ENGINEERING AND DESIGN 337 (2018) : 428-438 .
APA Song, Shilin , Zhao, Quanbin , Chong, Daotong , Chen, Weixiong , Yan, Junjie . Numerical simulation of vortex in residual heat removal system during mid-loop operation . | NUCLEAR ENGINEERING AND DESIGN , 2018 , 337 , 428-438 .
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Waste heat and water recovery characteristics of heat exchangers for dryer exhaust EI SCIE Scopus
期刊论文 | 2018 , 36 (6) , 709-722 | DRYING TECHNOLOGY
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

In many industrial drying processes, water is evaporated in the drying section by a large volume of fresh air supply, which contains a large amount of sensible and latent heat. Recovering heat and water from the dryer exhaust is a potential way to realize energy and water conservation in drying systems. In this paper, the experimental and theoretical investigations of the waste heat and water recovery characteristics of heat exchangers for dryer exhaust are presented. A hot air and water vapor mixture was used to simulate dryer exhaust. Convection-condensation heat transfer and water recovery characteristics were first obtained under various water vapor mass fractions, flow velocities, and humid air inlet temperatures through experiments, which revealed that the convection-condensation heat transfer coefficient increased with the increase in water vapor mass fraction and humid air velocity, and decreased with the increase in inlet temperature. The condensed water rate increased with the increase in water vapor mass fraction and humid air velocity, while inlet temperature had almost no effect on it. The condensing ratio decreased with the increase in water vapor mass fraction and humid air velocity, while improving the inlet temperature slightly reduced it. Then, a theoretical calculation model was developed to predict the heat and water recovery characteristics of heat exchangers under a wide working condition. In this model, the pipe and suction effects caused by condensation on the tube wall were considered. The properties of humid air were changed according to the temperature and vapor content instead of regarding them as constant values. The calculation results were compared with the present experimental data and those of previous studies. The good prediction accuracy and the universality of the present model were verified. This study is of great significance to the design of heat exchangers.

Keyword :

theoretical model experiments water recovery Dryer exhaust heat recovery

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GB/T 7714 Qin, Yuanzhi , Fu, Hao , Wang, Jinshi et al. Waste heat and water recovery characteristics of heat exchangers for dryer exhaust [J]. | DRYING TECHNOLOGY , 2018 , 36 (6) : 709-722 .
MLA Qin, Yuanzhi et al. "Waste heat and water recovery characteristics of heat exchangers for dryer exhaust" . | DRYING TECHNOLOGY 36 . 6 (2018) : 709-722 .
APA Qin, Yuanzhi , Fu, Hao , Wang, Jinshi , Liu, Ming , Yan, Junjie . Waste heat and water recovery characteristics of heat exchangers for dryer exhaust . | DRYING TECHNOLOGY , 2018 , 36 (6) , 709-722 .
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Experimental research on convection?condensation heat transfer characteristics and sootblowing operation strategy of waste heat recovery heat exchanger for dryer exhaust EI
期刊论文 | 2018 | Drying Technology
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Abstract :

In this study, air/water vapor mixture with ash particles was used to simulate actual dryer exhaust gas. An experimental study of the convection–condensation heat transfer characteristics of air/vapor mixtures with ash particles across horizontal tube-bundles was conducted under various water vapor mass fractions and concentrations of ash particles. The variation of convection–condensation heat transfer coefficient with time presented four different types, as follows: almost did not change with time; decreased first, then reached stable values; decreased continuously in the experimental time; and decreased rapidly, decreased slowly, and decreased rapidly, with potential to increase again. In general, the convection–condensation heat transfer coefficient decreased with increasing concentration of ash particles and increased with increasing water vapor mass fraction. The reducing effect on the convection–condensation heat transfer coefficient by ash deposition would be weakened by increasing the water vapor mass fraction, but the heat exchanger would be blocked further easily by increasing the concentration of ash particles. Then, a distribution diagram was drawn to present different types of convection–condensation heat transfer curves under various working parameters. Sootblowing operation strategies were proposed under different working conditions to provide reference for the actual operation of the waste heat recovery heat exchanger for dryer exhaust. © 2018, © 2018 Taylor & Francis Group, LLC.

Keyword :

Ash deposition Ash particles Condensation heat transfer Condensation heat transfer coefficients Distribution diagram Experimental research Operation strategy Working parameters

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GB/T 7714 Qin, Yuanzhi , Wang, Jinshi , Liu, Yiwen et al. Experimental research on convection?condensation heat transfer characteristics and sootblowing operation strategy of waste heat recovery heat exchanger for dryer exhaust [J]. | Drying Technology , 2018 .
MLA Qin, Yuanzhi et al. "Experimental research on convection?condensation heat transfer characteristics and sootblowing operation strategy of waste heat recovery heat exchanger for dryer exhaust" . | Drying Technology (2018) .
APA Qin, Yuanzhi , Wang, Jinshi , Liu, Yiwen , Duan, Yifei , Liu, Ming , Yan, Junjie . Experimental research on convection?condensation heat transfer characteristics and sootblowing operation strategy of waste heat recovery heat exchanger for dryer exhaust . | Drying Technology , 2018 .
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Experimental investigation on heat transfer characteristics in circulatory flash vaporization of aqueous NaCl solution EI Scopus SCIE
期刊论文 | 2018 , 446 , 12-20 | Desalination
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Abstract :

In this work, a series of experiments on circulatory flash vaporization of 10% and 20% NaCl solution was performed. The heat transfer characteristics in circulatory flash vaporization under different experimental conditions were presented. The non-equilibrium fraction of circulatory flash vaporization (NEF) was adopted to describe the extent of flash vaporization process completion. A volumetric heat transfer coefficient of circulatory flash vaporization (hv) was introduced in the present study to evaluate the heat flux evolution from per unit volume of liquid pool under unit superheat degree. Moreover, the influences of superheat degree, pressure of flash evaporator, initial liquid level, circulating flow rate and concentration of NaCl solution on the volumetric heat transfer coefficient were also analyzed. Results suggested that the volumetric heat transfer coefficient increased with the superheat degree and flash chamber pressure. Lowering the initial liquid level and brine concentration promoted the heat transfer intensity. And Nusselt number of circulatory flash vaporization NuA was proposed to describe the heat transfer performance of circulatory flash vaporization according to the definition of volumetric heat transfer coefficient. Moreover, a correlation between Nusselt number of circulatory flash vaporization and dimensionless parameters was obtained with the relative error between −31.1% and 32.8% for 1.5 ≤ ΔT ≤ 20 K, 400≤Q≤1200 L h−1, 7.4 ≤ Pf ≤ 31.2 kPa and 0.05 ≤ fm ≤ 0.2. © 2018 Elsevier B.V.

Keyword :

Aqueous NaCl solutions Dimensionless parameters Experimental investigations Flash vaporization Heat transfer characteristics Heat transfer performance Non equilibrium Volumetric heat transfer coefficients

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GB/T 7714 Wang, Yu , He, Qi , Li, Gen et al. Experimental investigation on heat transfer characteristics in circulatory flash vaporization of aqueous NaCl solution [J]. | Desalination , 2018 , 446 : 12-20 .
MLA Wang, Yu et al. "Experimental investigation on heat transfer characteristics in circulatory flash vaporization of aqueous NaCl solution" . | Desalination 446 (2018) : 12-20 .
APA Wang, Yu , He, Qi , Li, Gen , Yang, Qingzhong , Yan, Junjie . Experimental investigation on heat transfer characteristics in circulatory flash vaporization of aqueous NaCl solution . | Desalination , 2018 , 446 , 12-20 .
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Increasing operational flexibility of supercritical coal-fired power plants by regulating thermal system configuration during transient processes EI Scopus SCIE
期刊论文 | 2018 , 228 , 2375-2386 | Applied Energy
SCOPUS Cited Count: 3
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Abstract :

The operational flexibility of traditional coal-fired power generators has played crucial parts in many countries given the continuous integration of intermittent and fluctuant renewable power resources in their power system. This study is aimed at improving the short-term operational flexibility of thermal power units. The transient simulation models of a 660 MW supercritical coal-fired power system are developed by using the GSE software, and the six measures of regulating thermal system configuration, which can rapidly activate thermal storages in thermal systems, are introduced and compared. The greatest potential mode in each measure of regulating thermal system configuration is obtained on the basis of the utilization degree of the internal thermal storages. The dynamic characteristics of the thermal parameters of the selected measures are compared, and the results reveal that the measures of regulating extraction steam from low-pressure heaters has less negative effects on the live and reheat steam parameters but greater negative effects on the deaerator and condenser parameters than the measures of regulating extraction steam from high-pressure heaters. Moreover, the performance indexes of operational flexibility are also evaluated for all the measures of regulating thermal system configuration. Among five measures applied in the power-up process, the values of power ramp rate are from 1.26% to 6.31% of rated power per minute, the values of power capacity are from 12.87 to 48.35 MW, and the values of energy capacity during the regulating time of 120 s are 1009.73 to 5048.93 MJ. However, the measure of condensate water increasing of low-pressure heaters is an only way suitable for the power-down regulation process, and the value of power ramp rate is 0.61% of rated power per minute, the power capacity is −5.65 MW, and the energy capacity is −483.84 MJ. The best regulating measures are obtained on the basis of the different perspectives of operational flexibility. The findings of this study can help determine the best operational control strategies in different situations. © 2018 Elsevier Ltd

Keyword :

Coal-fired power generators Coal-fired power systems Continuous integrations Operational flexibility Thermal power plants Thermal systems Transient simulation Transient simulation models

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GB/T 7714 Zhao, Yongliang , Liu, Ming , Wang, Chaoyang et al. Increasing operational flexibility of supercritical coal-fired power plants by regulating thermal system configuration during transient processes [J]. | Applied Energy , 2018 , 228 : 2375-2386 .
MLA Zhao, Yongliang et al. "Increasing operational flexibility of supercritical coal-fired power plants by regulating thermal system configuration during transient processes" . | Applied Energy 228 (2018) : 2375-2386 .
APA Zhao, Yongliang , Liu, Ming , Wang, Chaoyang , Li, Xin , Chong, Daotong , Yan, Junjie . Increasing operational flexibility of supercritical coal-fired power plants by regulating thermal system configuration during transient processes . | Applied Energy , 2018 , 228 , 2375-2386 .
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