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学者姓名:严俊杰

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< Page ,Total 46 >
Numerical investigation on the heat transfer characteristics of unstable steam jet under different operating conditions EI SCIE
期刊论文 | 2021 , 180 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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Abstract :

Transient numerical study was performed to investigate the characteristics of interphase heat transfer in unstable steam jet under different operating conditions. Bubble radius change rate, interfacial heat transfer coefficient and overall condensation mass flux reached their maximum values during the bubble necking stage. The maximum peak value of interfacial heat transfer coefficient and bubble radius change rate decreased with the decrease of inlet pressure differential and water subcooling. The peak values of interfacial heat transfer coefficient and internal velocity were found in the bubble neck region. The effect of interphase heat transfer on bubble growth and necking stages was analyzed on the basis of overall force balance. Momentum force played a major role during the bubble growth stage, and the condensa-tion force had a dominant effect on bubble necking stage. Condensation force first decreased and reached its minimum value during bubble rapid necking stage. Subsequently, the condensation force rapidly in-creased and promoted the movement of bubble necking. Moreover, the condensation force curves under different conditions had the same change law. (c) 2021 Elsevier Ltd. All rights reserved.

Keyword :

Force Analysis Numerical Simulation Steam Bubble Condensation Interfacial Heat Transfer

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GB/T 7714 Song, Shilin , Zhao, Quanbin , Chong, Daotong et al. Numerical investigation on the heat transfer characteristics of unstable steam jet under different operating conditions [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2021 , 180 .
MLA Song, Shilin et al. "Numerical investigation on the heat transfer characteristics of unstable steam jet under different operating conditions" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 180 (2021) .
APA Song, Shilin , Zhao, Quanbin , Chong, Daotong , Chen, Weixiong , Yan, Junjie . Numerical investigation on the heat transfer characteristics of unstable steam jet under different operating conditions . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2021 , 180 .
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Irreversibility Analysis on a Phase Change Exchanger During Transient Processes EI
期刊论文 | 2021 , 42 (5) , 1100-1106 | Journal of Engineering Thermophysics
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Abstract :

Thermodynamic analysis on the transient processes of heat exchangers can be used for a reference and guidance for designs and operations. In this paper, a dynamic model of a phase change heat exchanger was developed based on the basic principle and mass, energy, and momentum conservation equations. The work processes of the phase change heat exchanger can be described by differential equations. The transient behaviors of phase change heat exchanger during the transient processes were obtained. Furthermore, the change law of entropy generation of the heat exchange unit under different design parameters during the transient processes was studied. Results show that the additional entropy generation is generated in the heat exchanger during the transient processes compared with stationary work conditions. And the additional entropy generation can be reduced by increasing the metal's thermal diffusivity, reducing metal wall thickness, increasing heat transfer resistance between working fluid and metal wall. © 2021, Science Press. All right reserved.

Keyword :

Metal working Thermoanalysis Heat exchangers Heat transfer Differential equations Heat resistance Entropy

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GB/T 7714 Zhang, Ke-Zhen , Huang, Zhi , Wang, Chao-Yang et al. Irreversibility Analysis on a Phase Change Exchanger During Transient Processes [J]. | Journal of Engineering Thermophysics , 2021 , 42 (5) : 1100-1106 .
MLA Zhang, Ke-Zhen et al. "Irreversibility Analysis on a Phase Change Exchanger During Transient Processes" . | Journal of Engineering Thermophysics 42 . 5 (2021) : 1100-1106 .
APA Zhang, Ke-Zhen , Huang, Zhi , Wang, Chao-Yang , Zhao, Yong-Liang , Liu, Ming , Yan, Jun-Jie . Irreversibility Analysis on a Phase Change Exchanger During Transient Processes . | Journal of Engineering Thermophysics , 2021 , 42 (5) , 1100-1106 .
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Dynamic performance and control strategy modification for coal-fired power unit under coal quality variation EI SCIE
期刊论文 | 2021 , 223 | Energy
WoS CC Cited Count: 1
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Abstract :

The variation in feeding coal quality is a major issue during coal-fired power unit operation because it causes output power fluctuation, increase in heat losses, and operation safety risks. Given this situation, the effect of coal quality variation on power plant performance should be explored to improve the control strategy considering coal quality variation. In this study, dynamic models of coal-fired power plants are developed. Results show that the unit efficiency decreases when the coal quality worsens, and the carbon, ash, and moisture contents in coal are dominant factors. Dynamic processes with coal quality variation are simulated, and overtemperature risks, deviation of output power, and additional energy consumption are evaluated. Then, the modification of control strategy is proposed to enhance the coal-fired power unit performance, which adds coal quality variation into the water–fuel ratio calculation. With the modified control logic, the duration of the dynamic process is reduced by approximately 40%, and the fluctuation amplitudes of the live and reheat steam temperatures are decreased by approximately 90% and 60%, respectively. In addition, the additional energy consumption is diminished. © 2021 Elsevier Ltd

Keyword :

Coal industry Energy utilization Coal Quality control Fossil fuel power plants

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GB/T 7714 Yin, Junjie , Liu, Ming , Zhao, Yongliang et al. Dynamic performance and control strategy modification for coal-fired power unit under coal quality variation [J]. | Energy , 2021 , 223 .
MLA Yin, Junjie et al. "Dynamic performance and control strategy modification for coal-fired power unit under coal quality variation" . | Energy 223 (2021) .
APA Yin, Junjie , Liu, Ming , Zhao, Yongliang , Wang, Chaoyang , Yan, Junjie . Dynamic performance and control strategy modification for coal-fired power unit under coal quality variation . | Energy , 2021 , 223 .
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A Review on Thermal Design of Liquid Droplet Radiator System EI SCIE CSCD
期刊论文 | 2021 , 30 (2) , 394-417 | Journal of Thermal Science
WoS CC Cited Count: 1
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Abstract :

Liquid Droplet Radiator (LDR) system is regarded as a quite promising waste heat rejection system for aerospace engineering. A comprehensive review on the state-of-the-art of LDR system was carried out. The thermal design considerations of crucial components such as working fluid, droplet generator and collector, intermediate heat exchanger, circulating pump and return pipe were reviewed. The state-of-the-art of existing mathematical models of radiation and evaporation characteristics of droplet layer from literatures were summarized. Furthermore, thermal designs of three LDR systems were completed. The weight and required planform area between the rectangular and triangular LDR systems were respectively compared and the evaporation models for calculating the mass loss were evaluated. Based on the review, some prospective studies of LDR system were put forward in this paper. © 2021, Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature.

Keyword :

Radiators Evaporation Waste heat Drops

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GB/T 7714 Chong, Daotong , Zhu, Maoguo , Zhao, Quanbin et al. A Review on Thermal Design of Liquid Droplet Radiator System [J]. | Journal of Thermal Science , 2021 , 30 (2) : 394-417 .
MLA Chong, Daotong et al. "A Review on Thermal Design of Liquid Droplet Radiator System" . | Journal of Thermal Science 30 . 2 (2021) : 394-417 .
APA Chong, Daotong , Zhu, Maoguo , Zhao, Quanbin , Chen, Weixiong , Yan, Junjie . A Review on Thermal Design of Liquid Droplet Radiator System . | Journal of Thermal Science , 2021 , 30 (2) , 394-417 .
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Thermodynamic optimization of the superheater during switching the load transient processes EI SCIE
期刊论文 | 2021 , 218 | Energy
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The boiler superheater undergoes load cycling transients, once the thermal power plant participates in peak shaving. Thermodynamic optimization of a superheater is carried out by optimizing the flowrate/temperature matches between the hot and cold fluids during switching the load rate from 0.75 to 1.00. On the basis of a dynamic model of the superheater, the transient thermal performance is presented. Furthermore, the exergy delivery efficiency of the superheater was analyzed. The superheater outlet temperatures of hot fluid, metal wall, and cold fluid are highly affected when regulating work fluid inlet flowrates/temperatures. During switching the load transient, when increasing the hot fluid flowrate amplitude and variation rate by 50%, the average exergy efficiency (ηE,avg) of the superheater can improve by 1.04% and 0.13%, respectively. When increasing the cold fluid inlet temperature by 5%, ηE,avg can improve by 1.16%. When increasing the hot fluid inlet temperature by 5%, ηE,avg decreases by 0.74%. The exergy efficiency of the superheater is more sensitive to regulating temperature match than the flowrate match during switching the load transient process. © 2020 Elsevier Ltd

Keyword :

Efficiency Switching Superheaters Thermoelectric power plants Temperature Exergy

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GB/T 7714 Wang, Chaoyang , Liu, Ming , Zhao, Yongliang et al. Thermodynamic optimization of the superheater during switching the load transient processes [J]. | Energy , 2021 , 218 .
MLA Wang, Chaoyang et al. "Thermodynamic optimization of the superheater during switching the load transient processes" . | Energy 218 (2021) .
APA Wang, Chaoyang , Liu, Ming , Zhao, Yongliang , Yan, Junjie . Thermodynamic optimization of the superheater during switching the load transient processes . | Energy , 2021 , 218 .
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Advanced exergy analysis of a Joule-Brayton pumped thermal electricity storage system with liquid-phase storage EI SCIE
期刊论文 | 2021 , 231 | Energy Conversion and Management
WoS CC Cited Count: 1
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Abstract :

Pumped thermal electricity storage is a thermo-mechanical energy storage technology that has emerged as a promising option for large-scale (grid) storage because of its lack of geographical restrictions and relatively low capital costs. This paper focuses on a 10 MW Joule-Brayton pumped thermal electricity storage system with liquid thermal stores and performs detailed conventional and advanced exergy analyses of this system. Results of the conventional exergy analysis on the recuperated system indicate that the expander during discharge is associated with the maximum exergy destruction rate (13%). The advanced exergy analysis further reveals that, amongst the system components studied, the cold heat exchanger during discharge is associated with the highest share (95%) of the avoidable exergy destruction rate, while during charge the same component is associated with the highest share (64%) of the endogenous exergy destruction rate. Thus, the cold heat exchanger offers the largest potential for improvement in the overall system exergetic efficiency. A quantitative analysis of the overall system performance improvement potential of the recuperated system demonstrates that increasing the isentropic efficiency of the compressor and turbine from 85% to 95% significantly increases the modified overall exergetic efficiency from 37% to 57%. Similarly, by increasing the effectiveness and decreasing the pressure loss factor of all heat exchangers, from 0.90 to 0.98 and from 2.5% to 0.5% respectively, the modified overall exergetic efficiency increases from 34% to 54%. The results of exergy analyses provide novel insight into the innovation, research and development of pumped thermal electricity storage technology. © 2021 Elsevier Ltd

Keyword :

Exergy Heat exchangers Electric energy storage

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GB/T 7714 Zhao, Yongliang , Liu, Ming , Song, Jian et al. Advanced exergy analysis of a Joule-Brayton pumped thermal electricity storage system with liquid-phase storage [J]. | Energy Conversion and Management , 2021 , 231 .
MLA Zhao, Yongliang et al. "Advanced exergy analysis of a Joule-Brayton pumped thermal electricity storage system with liquid-phase storage" . | Energy Conversion and Management 231 (2021) .
APA Zhao, Yongliang , Liu, Ming , Song, Jian , Wang, Chaoyang , Yan, Junjie , Markides, Christos N . Advanced exergy analysis of a Joule-Brayton pumped thermal electricity storage system with liquid-phase storage . | Energy Conversion and Management , 2021 , 231 .
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Operation scheduling of a coal-fired CHP station integrated with power-to-heat devices with detail CHP unit models by particle swarm optimization algorithm EI SCIE
期刊论文 | 2021 , 214 | Energy
WoS CC Cited Count: 17
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Abstract :

The accommodation of high-penetration renewable power poses a considerable challenge to power grids. Coal-fired combined heat and power (CHP) stations are forced to enhance their operational flexibility by applying heat-power decoupling technologies. Power-to-heat devices, including electric boilers and heat pumps, are capable to enhance the operational flexibility of coal-fired CHP stations. The problem regarding the operation scheduling of a CHP station with multiple CHP units and power-to-heat devices is addressed in this study. Operation optimization models integrated with detail CHP unit models are developed, and the particle swarm optimization algorithm is utilized as the optimization algorithm. Then, a case study are carried out. Results show that the unequal distribution of heating and power loads among coal-fired CHP units can decrease the total irreversibility caused by heating steam pressure regulation. The operation scheduling method provided in this study can decrease the total coal consumption by 14.14 and 14.70 t/day for the CHP station integrated with an electric boiler and a heat pump, respectively. As a result, 1204.7 and 1252.44 ton CO2, and an additional ∼182 and ∼190 kUSD/year can be saved for the reference CHP station integrated with an electric boiler and a heat pump, respectively. © 2020 Elsevier Ltd

Keyword :

Pumps Coal fired boilers Electric power transmission networks Coal Particle swarm optimization (PSO) Scheduling Heat pump systems

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GB/T 7714 Liu, Ming , Wang, Shan , Yan, Junjie . Operation scheduling of a coal-fired CHP station integrated with power-to-heat devices with detail CHP unit models by particle swarm optimization algorithm [J]. | Energy , 2021 , 214 .
MLA Liu, Ming et al. "Operation scheduling of a coal-fired CHP station integrated with power-to-heat devices with detail CHP unit models by particle swarm optimization algorithm" . | Energy 214 (2021) .
APA Liu, Ming , Wang, Shan , Yan, Junjie . Operation scheduling of a coal-fired CHP station integrated with power-to-heat devices with detail CHP unit models by particle swarm optimization algorithm . | Energy , 2021 , 214 .
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Flexibility enhancement versus thermal efficiency of coal-fired power units during the condensate throttling processes EI SCIE
期刊论文 | 2021 , 218 | Energy
WoS CC Cited Count: 4
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Abstract :

The improvement in operational flexibility of thermal power plants plays an essential role in the stable and safe operation of large-scale power grids. Condensate throttling is an effective method for enhancing the operational flexibility of thermal power plants, but it inevitably influences their thermal efficiency. In fact, the entire condensate throttling process consists of two stages: the condensate throttling process and the recovery process of the deaerator water level. To evaluate exergy efficiency during the entire condensate throttling process, dynamic models of a condensate throttling system were developed and exergy analysis was performed. Results indicate that additional exergy losses occur during the condensate throttling process. The cold end system is the component that exhibits the highest additional exergy loss (64.89%), followed by the deaerator (40.49%), heaters (4.82%), and turbines (−10.20%). Operational flexibility is in contrast with thermal efficiency during the condensate throttling process. The cycling and total exergy losses of the system increase with an increase in the condensate throttled ratio. Cycling loss can be decreased by a maximum of 51.46% by selecting an appropriate condensate water adjustment strategy during the entire condensate throttling process. © 2020 Elsevier Ltd

Keyword :

Water levels Thermoelectric power plants Electric power transmission networks Efficiency Exergy

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GB/T 7714 Zhang, Kezhen , Zhao, Yongliang , Liu, Ming et al. Flexibility enhancement versus thermal efficiency of coal-fired power units during the condensate throttling processes [J]. | Energy , 2021 , 218 .
MLA Zhang, Kezhen et al. "Flexibility enhancement versus thermal efficiency of coal-fired power units during the condensate throttling processes" . | Energy 218 (2021) .
APA Zhang, Kezhen , Zhao, Yongliang , Liu, Ming , Gao, Lin , Fu, Yue , Yan, Junjie . Flexibility enhancement versus thermal efficiency of coal-fired power units during the condensate throttling processes . | Energy , 2021 , 218 .
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Design and optimization of waste heat recovery system for supercritical carbon dioxide coal-fired power plant to enhance the dust collection efficiency EI SCIE
期刊论文 | 2020 , 275 | Journal of Cleaner Production | IF: 9.297
WoS CC Cited Count: 5
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Abstract :

The supercritical carbon dioxide (SCO2) power cycle is a potential power cycle for coal-fired power plants. In the SCO2 power systems provided in previous studies, the boiler exhaust temperature is about 120 °C. To enhance the power plant efficiency and the dust collection efficiency of electrostatic precipitator, SCO2 power systems should be advanced to cool the boiler exhaust fluegas to nearly 95 °C. Therefore, systems of waste heat recovery from low-temperature fluegas are proposed and optimized in this study. Thermodynamic and optimization models are developed. The double reheat recompression SCO2 cycle is optimized as benchmark system. The benchmark system is improved to decrease the exergy loss and boiler exhaust, decrease the irreversibility of air preheater, and recover waste heat of the SCO2 cycle to preheat air to the air preheater. When the main compressor intercooling or bypass fluegas ahead the air preheater is adopted, the temperature of boiler exhaust fluegas can be decreased to around 95 °C which can ensure a high dust collection efficiency of electrostatic precipitator. The power plant efficiency is also increased as a result. However, if only low-temperature economizer is integrated, then the power plant efficiency is enhanced slightly by 0.09%-pts. If the low temperature economizer is integrated with other system improvements, the power plant efficiency can be enhanced by 0.89%-pts. Exergy analysis is also performed to reveal the mechanisms of efficiency enhancement. © 2020 Elsevier Ltd

Keyword :

Dust collectors Waste heat utilization Electrostatic precipitators Electrostatics Supercritical fluid extraction Reheat cycle Boilers Efficiency Waste heat Coal dust Economizers Air preheaters Coal Metal recovery Exergy Coal fueled furnaces Temperature Fossil fuel power plants Carbon dioxide

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GB/T 7714 Liu, Ming , Yang, Kaixuan , Zhang, Xuwei et al. Design and optimization of waste heat recovery system for supercritical carbon dioxide coal-fired power plant to enhance the dust collection efficiency [J]. | Journal of Cleaner Production , 2020 , 275 .
MLA Liu, Ming et al. "Design and optimization of waste heat recovery system for supercritical carbon dioxide coal-fired power plant to enhance the dust collection efficiency" . | Journal of Cleaner Production 275 (2020) .
APA Liu, Ming , Yang, Kaixuan , Zhang, Xuwei , Yan, Junjie . Design and optimization of waste heat recovery system for supercritical carbon dioxide coal-fired power plant to enhance the dust collection efficiency . | Journal of Cleaner Production , 2020 , 275 .
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Simulation Research on Dynamic Characteristics of 660 MW Solar-Assisted Coal-Fired Power Generation System EI CSCD
期刊论文 | 2020 , 41 (8) , 1837-1844 | Journal of Engineering Thermophysics | IF: 1.402
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Solar-assisted coal-fired power generation couples solar collector system and coal-fired power generation system in thermal system, which can simultaneously decrease the investment of concentrated solar power and energy consumption of coal-fired power plant. It is an effective solution to the diversified transformation of the energy structure, energy saving and emission reduction. The dynamic characteristics of an integrated system, in which the trough solar collector system is connected in parallel to high-pressure heaters of coal-fired plant, with step disturbance of direct normal irradiance and feedwater flowrate ratio were studied, The results show that the output power increases with the step increase of direct normal irradiance. Moreover, the output power first decreases and then increases to a steady state value with the step decrease of feedwater flowrate ratio. Both The output power variation and response time increase with the number of high-pressure heaters paralleled with trough collector system. © 2020, Science Press. All right reserved.

Keyword :

Feedwater heaters Solar collectors Solar power generation Energy utilization Energy conservation Coal Coal industry Emission control Investments Fossil fuel power plants Solar power plants

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GB/T 7714 Li, Xin , Wei, Hong-Bo , Liu, Ming et al. Simulation Research on Dynamic Characteristics of 660 MW Solar-Assisted Coal-Fired Power Generation System [J]. | Journal of Engineering Thermophysics , 2020 , 41 (8) : 1837-1844 .
MLA Li, Xin et al. "Simulation Research on Dynamic Characteristics of 660 MW Solar-Assisted Coal-Fired Power Generation System" . | Journal of Engineering Thermophysics 41 . 8 (2020) : 1837-1844 .
APA Li, Xin , Wei, Hong-Bo , Liu, Ming , Zhao, Yong-Liang , Wang, Zhu , Yan, Jun-Jie . Simulation Research on Dynamic Characteristics of 660 MW Solar-Assisted Coal-Fired Power Generation System . | Journal of Engineering Thermophysics , 2020 , 41 (8) , 1837-1844 .
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