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学者姓名：鹿院卫
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Abstract ：
To develop heat transfer/storage molten salt materials that matched the third-generation solar thermal power generation technology, NaNO3, NaOH, and Na2CO3 molten salts with the same cation were selected as the research objects. Phase diagram calculation for the NaNO3-NaOHNa2CO3 ternary system was carried out based on thermodynamic theory and phase diagram software, and the preferred mixed molten salt was determined by experiment. The results indicated that there was one eutectic point in the ternary system calculated by the Direct method, while the FactSage software simulation predicted that there were four eutectic points in the ternary system. The mixed molten salt corresponding to the eutectic point (E4) with the lowest melting point was selected as the preferred molten salt. The melting point of preferred molten salt was 246.44℃, the decomposition temperature was 649.5℃, and the average specific heat capacity was 1.68 J·g−1·K−1, which met the requirements as the medium and high temperature heat transfer/storage material. © 2025 Science Press. All rights reserved.
Keyword ：
Electron temperature Electron temperature Curie temperature Curie temperature Boiling point Boiling point Heat conduction Heat conduction Thermal effects Thermal effects Thermal cycling Thermal cycling Specific heat of liquids Specific heat of liquids Temperature distribution Temperature distribution Cryogenics Cryogenics Room temperature Room temperature Interfacial energy Interfacial energy Entropy Entropy Specific energy Specific energy Neel temperature Neel temperature Melting point Melting point Thermal gradients Thermal gradients Enthalpy Enthalpy Thermodynamic stability Thermodynamic stability Temperature sensors Temperature sensors Heat convection Heat convection Temperature scales Temperature scales Heating temperature Heating temperature Free energy Free energy Thermal load Thermal load Critical temperature Critical temperature Chemical potential Chemical potential Vapor pressure Vapor pressure Specific heat of solids Specific heat of solids Cooling Cooling
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| GB/T 7714 | Wang, Yuanyuan , Lu, Yuanwei , He, Cong et al. Screening and Thermophysical Properties Study of Mixed Molten Salts With Same Cation [J]. | Journal of Engineering Thermophysics , 2025 , 46 (5) : 1640-1645 . |
| MLA | Wang, Yuanyuan et al. "Screening and Thermophysical Properties Study of Mixed Molten Salts With Same Cation" . | Journal of Engineering Thermophysics 46 . 5 (2025) : 1640-1645 . |
| APA | Wang, Yuanyuan , Lu, Yuanwei , He, Cong , Wu, Yuting , Zhang, Cancan . Screening and Thermophysical Properties Study of Mixed Molten Salts With Same Cation . | Journal of Engineering Thermophysics , 2025 , 46 (5) , 1640-1645 . |
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Abstract ：
Molten salt with wide temperature range is an excellent thermal energy storage medium, which is essential in concentrating solar power plants. In this work, the novel nitrate/nitrite molten salts for thermal energy storage (TES) were designed. The eutectic points of the NaNO3-KNO2 and NaNO3-NaNO2 systems were predicted by developing the back-propagation (BP) neural network optimized based on genetic algorithm (GA). In addition, the phase diagrams of the molten salts were calculated using the thermodynamic sub-regular solution model (SSM). The nitrate/nitrite thermodynamic database was supplemented. Based on experimental validation, both BP-GA and SSM methods were effective means of predicting the molten salts eutectic points, with maximum prediction errors of 7.9 % and 6.0 %, respectively. The liquid usage temperature ranges for NaNO3-KNO2 and NaNO3-KNO2 eutectic salts were 152.4-612.2 degrees C and 232.4-602.0 degrees C, respectively. The sensible heat storage density of NaNO3-KNO2 molten salt was 729.8 kJ/kg, which was about 63.5 % higher than the Solar salt. This work not only provided methods for screening target molten salt, but also provided the theoretical and experimental basis for the widespread application of molten salts for TES. In future work, we will further optimize the prediction algorithm and explore the long-term thermal stability of the preferred molten salts.
Keyword ：
Phase diagram computation Phase diagram computation Wide working temperature range Wide working temperature range Molten salt Molten salt Thermophysical properties Thermophysical properties Machine learning Machine learning
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| GB/T 7714 | Wang, Yuanyuan , Wang, Zixuan , Lu, Yuanwei et al. Phase diagram calculation and neural network prediction of nitrate/nitrite molten salts with wide working temperature range for thermal storage system [J]. | ENERGY , 2025 , 322 . |
| MLA | Wang, Yuanyuan et al. "Phase diagram calculation and neural network prediction of nitrate/nitrite molten salts with wide working temperature range for thermal storage system" . | ENERGY 322 (2025) . |
| APA | Wang, Yuanyuan , Wang, Zixuan , Lu, Yuanwei , Wu, Yuting , Zhang, Cancan . Phase diagram calculation and neural network prediction of nitrate/nitrite molten salts with wide working temperature range for thermal storage system . | ENERGY , 2025 , 322 . |
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Abstract ：
Since the renewable energy generation output is unstable, some measures are needed to maintain the stability of the power grid with the increasing proportion of them. Integrating thermal energy storage (TES) system into coal-fired power unit (CFPU) to increase its flexibility is a simple and promising solution. This work proposed a novel two-stage three-tank molten salt TES system. A 600 MW subcritical CFPU was utilized to analyze the effect of main steam extraction on the thermal performance and peak shaving capacity under different cases. 40 % turbine heat acceptance (THA) was selected as peaking shaving condition of charging process. Results show that with the increase of THA in the discharging process, thermal efficiency, exergy efficiency, and output electric load of the flexible CFPU increased, while comprehensive coal consumption rate and peak shaving time decreased. Additionally, due to the increment of output electric load being greater than the decrease in peak shaving time, the highest generation increment is obtained when discharging at 100 %THA (137.43 MWh). Lastly, the efficiency of TES is 38.1-48.04 %, which increases with the electrical load output of the discharging increases. Overall, this work provides an effective and feasible integration method between TES and CFPU.
Keyword ：
Thermal energy storage Thermal energy storage Coal-fired power unit Coal-fired power unit Peak shaving capacity Peak shaving capacity Extracted steam Extracted steam Molten salt Molten salt
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| GB/T 7714 | Lv, Shengnan , Lu, Yuanwei , Wei, Haijiao . Research on operational flexibility of 600 MW subcritical coal-fired power unit by coupling three-tank molten salt thermal energy storage system [J]. | ENERGY , 2025 , 322 . |
| MLA | Lv, Shengnan et al. "Research on operational flexibility of 600 MW subcritical coal-fired power unit by coupling three-tank molten salt thermal energy storage system" . | ENERGY 322 (2025) . |
| APA | Lv, Shengnan , Lu, Yuanwei , Wei, Haijiao . Research on operational flexibility of 600 MW subcritical coal-fired power unit by coupling three-tank molten salt thermal energy storage system . | ENERGY , 2025 , 322 . |
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Abstract ：
Based on the single-screw compressor (SSC) structure, a new type of composite slide valve (CSV) has been proposed and designed, featuring internal volume ratios of 2.8, 3.9, and 5.6 and operating under a partial load of 35%. The theoretical model describing the dynamic features and thermodynamic performance of the SSC with CSV has also been built. The pressure ratio of the experimental system can be adjusted from 3.3 to 7.8, and the experimental results demonstrate the CSV's effective performance. The deviations between the calculated and measured results for volume ratio and input power are 3.33-9.08% and 0.32-8.03%, and the deviations for heating capacity and adiabatic efficiency range from 0.92-8.73% to 2.09-9.67%, respectively. The introduction of the CSV offers a novel approach to enhancing SSC efficiency. Both the theoretical and experimental findings lay a foundation for future optimization and design improvements in variable load and internal volumetric ratio single-screw compressors.
Keyword ：
internal volumetric ratio control internal volumetric ratio control composite slide valve composite slide valve capacity control capacity control single-screw compressor single-screw compressor
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| GB/T 7714 | Liu, Shanwei , Zhi, Ruiping , Wu, Yuting et al. Theoretical and Experimental Research on Thermal Dynamic Characteristics of Single-Screw Compressor with a New Composite SLIDE Valve [J]. | ENERGIES , 2024 , 17 (10) . |
| MLA | Liu, Shanwei et al. "Theoretical and Experimental Research on Thermal Dynamic Characteristics of Single-Screw Compressor with a New Composite SLIDE Valve" . | ENERGIES 17 . 10 (2024) . |
| APA | Liu, Shanwei , Zhi, Ruiping , Wu, Yuting , Lu, Yuanwei , Lei, Biao , Ma, Chongfang . Theoretical and Experimental Research on Thermal Dynamic Characteristics of Single-Screw Compressor with a New Composite SLIDE Valve . | ENERGIES , 2024 , 17 (10) . |
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Abstract ：
Supercritical carbon dioxide printed circuit board heat exchangers are expected to be applied in third-generation solar thermal power generation. However, the uniformity of supercritical carbon dioxide entering the heat exchanger has a significant impact on the overall performance of the heat exchanger. In order to improve the uniformity of flow distribution in the inlet header. This article studies and optimizes the inlet header of a printed circuit board heat exchanger through numerical simulation. The results indicate that when supercritical carbon dioxide flows through the header cavity, eddy currents will be generated, which will increase the uneven distribution of flow rate, while reducing the generation of eddy currents will improve the uniform distribution of flow rate. When the dimensionless factor of the inlet header is 6, the hyperbolic configuration is the optimal structure. We also reduced the eddy current region by adding transition segments, and the results showed that the structure was the best when the dilation angle was 10 degrees, which reduced the non-uniformity by 21% compared to the hyperbolic configuration, providing guidance for engineering practice.
Keyword ：
numerical simulation numerical simulation inlet header inlet header third-generation solar thermal power generation third-generation solar thermal power generation PCHE PCHE
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| GB/T 7714 | Wang, Yanquan , Lu, Yuanwei , Wang, Yuanyuan et al. Structural Optimization of the Inlet Header of Supercritical Carbon Dioxide Printed Circuit Board Heat Exchanger [J]. | JOURNAL OF THERMAL SCIENCE , 2024 , 33 (4) : 1458-1467 . |
| MLA | Wang, Yanquan et al. "Structural Optimization of the Inlet Header of Supercritical Carbon Dioxide Printed Circuit Board Heat Exchanger" . | JOURNAL OF THERMAL SCIENCE 33 . 4 (2024) : 1458-1467 . |
| APA | Wang, Yanquan , Lu, Yuanwei , Wang, Yuanyuan , Han, Xinlong , Wu, Yuting , Gao, Qi . Structural Optimization of the Inlet Header of Supercritical Carbon Dioxide Printed Circuit Board Heat Exchanger . | JOURNAL OF THERMAL SCIENCE , 2024 , 33 (4) , 1458-1467 . |
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Abstract ：
Molten salt and supercritical carbon dioxide (sCO(2)) are considered to be one of the most promising combined heat transfer refrigerants for third-generation solar thermal power generation. To evaluate the potential of chloride salts and carbonates in third-generation solar thermal power generation, this paper uses molten salts and sCO(2) as the working media of printed circuit board heat exchangers (PCHE), and uses numerical simulation to study the heat transfer and friction of PCHE channels with different molten salts and sCO(2), and establishes predictive correlations respectively. A local heat transfer and friction study was conducted on the sCO(2) side of the airfoil channel, and it was found that the inlet mass flow rate has a significant impact on it, while the inlet temperature has a relatively small impact. A comprehensive comparison was made between the heat transfer and friction of two molten salts, and the comprehensive performance of chloride salts was 70%-80% higher than that of carbonates. The results indicate that the potential of chloride salts in third-generation solar thermal power generation is much greater than that of carbonates.
Keyword ：
PCHE PCHE molten salt molten salt third generation solar thermal power generation third generation solar thermal power generation sCO(2) sCO(2)
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| GB/T 7714 | Wang, Yanquan , Lu, Yuanwei , Gao, Qi et al. Numerical Study on Heat Transfer and Frictional Resistance of Two Types of Molten Salts in Straight Channels and Supercritical Carbon Dioxide in Airfoil Channels [J]. | JOURNAL OF THERMAL SCIENCE , 2024 , 33 (4) : 1443-1457 . |
| MLA | Wang, Yanquan et al. "Numerical Study on Heat Transfer and Frictional Resistance of Two Types of Molten Salts in Straight Channels and Supercritical Carbon Dioxide in Airfoil Channels" . | JOURNAL OF THERMAL SCIENCE 33 . 4 (2024) : 1443-1457 . |
| APA | Wang, Yanquan , Lu, Yuanwei , Gao, Qi , Li, Feng , Ma, Yancheng , Wang, Yuanyuan et al. Numerical Study on Heat Transfer and Frictional Resistance of Two Types of Molten Salts in Straight Channels and Supercritical Carbon Dioxide in Airfoil Channels . | JOURNAL OF THERMAL SCIENCE , 2024 , 33 (4) , 1443-1457 . |
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Abstract ：
With the growing share of renewable energy generation in the power grid system, the flexibility of existing coalfired units (CFPU) should be improved to keep power grid stability. Integrating a molten salt thermal energy storage system (MSTES) with CFPU is a simple and feasible method. Three-tank MSTES was adopted. Four integrated modes during discharging were proposed by extracting feedwater and condensed water to release heat and back to boiler, deaerator, or low-pressure turbine (LPT). The influence of extracted steam mass flow rate on the charging process is analyzed. The mass flow rate of extracted water, heat release capacity, heat consumption, exergy efficiency, and discharging time for each mode during discharging are compared. Round-trip efficiency and comprehensive coal consumption rate of the full peak shaving process were calculated. The results demonstrate that as the mass flow rate of extracted main steam increases, the peak shaving capacity increases, but the exergy efficiency decreases. During discharging, the mode of extracting feedwater and back to the boiler (DEAtB) has the lowest heat release capacity, while its heat consumption is higher than other modes. The mode of extracting feedwater and back to the LPT (DEAtLPT) has the highest exergy efficiency (44.05 %). For the full peak shaving process, mode DEAtB has the largest round-trip efficiency (49.97 %), the longest discharging time (4 h), and the lowest comprehensive coal consumption rate (317.43 g/kWh). This work provides practical and efficient integration methods between MSTES and CFPU.
Keyword ：
Molten salt Molten salt Extracted steam Extracted steam Integration mode Integration mode Coal-fired power unit Coal-fired power unit Thermal energy storage Thermal energy storage
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| GB/T 7714 | Lv, Shengnan , Lu, Yuanwei , Ma, Yancheng et al. Design and performance analysis of peak shaving mode for coal-fired power unit based on the molten salt thermal energy storage system [J]. | JOURNAL OF ENERGY STORAGE , 2024 , 104 . |
| MLA | Lv, Shengnan et al. "Design and performance analysis of peak shaving mode for coal-fired power unit based on the molten salt thermal energy storage system" . | JOURNAL OF ENERGY STORAGE 104 (2024) . |
| APA | Lv, Shengnan , Lu, Yuanwei , Ma, Yancheng , Cui, Yaru , Wang, Zixuan , Wu, Yuting et al. Design and performance analysis of peak shaving mode for coal-fired power unit based on the molten salt thermal energy storage system . | JOURNAL OF ENERGY STORAGE , 2024 , 104 . |
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Abstract ：
Molten salt nanofluids has been extensively considered for Thermal Energy Storage (TES) applications due to its enhanced heat storage and heat transfer properties. The compatibility between molten salt nanofluids and metal materials becomes a key issue affecting their application in TES systems. In this paper, corrosion tests were carried out on 316 L stainless steel in quaternary nitrate molten salt at 565 C-degrees using electrochemical methods including impedance spectroscopy and potentiodynamic polarization to determine the effect of the addition of nanoparticles to the molten salt corrosion process. The results showed that the addition of nanoparticles reduced the corrosion current density of 316 L stainless steel in quaternary mixed molten salt. The corrosion current density of 316 L stainless steel in molten salt nanofluids with SiO(2 )and TiO2 was reduced to 0.636 mA/cm(2) and 0.749 mA/cm(2), respectively. And the EIS results showed that the impedance value of 316 L stainless steel in molten salt nanofluids was significantly larger than that in base salt. The addition of nanoparticles to the molten salt slowed down the ionic transport of 316 L stainless steel in the molten salt and the formation of reticulated and acicular nanostructures enhanced the corrosion resistance of the stainless steel oxide layer. Therefore, the presence of nanoparticles reduces the corrosion of molten salt on stainless steel.
Keyword ：
Nanofluids Nanofluids Electrochemical method Electrochemical method Stainless steel Stainless steel Quaternary nitrate salt Quaternary nitrate salt
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| GB/T 7714 | Gao, Qi , Lu, Yuanwei , Wang, Yuanyuan et al. Electrochemical study on the corrosion behavior of 316L stainless steel in quaternary nitrate molten salt nanofluids for thermal energy storage applications [J]. | JOURNAL OF ENERGY STORAGE , 2024 , 83 . |
| MLA | Gao, Qi et al. "Electrochemical study on the corrosion behavior of 316L stainless steel in quaternary nitrate molten salt nanofluids for thermal energy storage applications" . | JOURNAL OF ENERGY STORAGE 83 (2024) . |
| APA | Gao, Qi , Lu, Yuanwei , Wang, Yuanyuan , Wu, Yuting , Zhang, Cancan , Wang, Yanquan . Electrochemical study on the corrosion behavior of 316L stainless steel in quaternary nitrate molten salt nanofluids for thermal energy storage applications . | JOURNAL OF ENERGY STORAGE , 2024 , 83 . |
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Abstract ：
Molten salt has been extensively applied as a medium for heat transfer and thermal energy storage. In this work, a novel quinary nitrate/nitrite mixed molten salt is developed and its comprehensive thermophysical properties, thermal stability, sensible thermal energy storage density and economics are evaluated. Based on the thermal analysis method, the melting point and decomposition temperature of the NaNO3-KNO3-Ca (NO3)2-NaNO2-KNO2 system are determined at 102.3 degrees C and 651.2 degrees C, respectively. Furthermore, the specific heat capacity, density and thermal conductivity of the quinary molten salt are measured using specific apparatus with satisfactory results. It is noteworthy that after long-term high temperature test and multiple heating-cooling cycle tests, the change rate of the various thermophysical properties of the quinary molten salt is all less than 10%, exhibiting excellent thermal stability. The sensible thermal energy storage density of the quinary molten salt is 743.7 kJ/kg, and the sensible thermal energy storage cost is 17.2 RMB/(kW & sdot;h). Eventually, the proposed molten salt has the advantages of the wide liquid operating temperature range, high sensible thermal energy storage density and better thermal performance, which can be widely used as an excellent heat transfer and storage material for thermal energy storage systems.
Keyword ：
Thermal stability Thermal stability Molten salt Molten salt Thermal energy storage Thermal energy storage Thermophysical property Thermophysical property Concentrated solar power Concentrated solar power
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| GB/T 7714 | Wang, Yuanyuan , Lu, Yuanwei , Wang, Yanquan et al. Investigation on thermal performance of quinary nitrate/nitrite mixed molten salts with low melting point for thermal energy storage [J]. | SOLAR ENERGY MATERIALS AND SOLAR CELLS , 2024 , 270 . |
| MLA | Wang, Yuanyuan et al. "Investigation on thermal performance of quinary nitrate/nitrite mixed molten salts with low melting point for thermal energy storage" . | SOLAR ENERGY MATERIALS AND SOLAR CELLS 270 (2024) . |
| APA | Wang, Yuanyuan , Lu, Yuanwei , Wang, Yanquan , Wu, Yuting , Gao, Qi , Zhang, Cancan . Investigation on thermal performance of quinary nitrate/nitrite mixed molten salts with low melting point for thermal energy storage . | SOLAR ENERGY MATERIALS AND SOLAR CELLS , 2024 , 270 . |
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Abstract ：
Aluminum ammonium sulfate dodecahydrate (AASD) is a promising hydrated salt-type phase change material. However, its application is severely hindered by its large undercooling and low thermal conductivity. Herein, Al2O3 nanoparticles and xanthan gum are utilized as additives to prepare the modified AASD and improve its supercooling. The modified AASD is adsorbed into the porous modified expanded graphite to prepare a shape-stable composite phase change material (CPCM). Differential scanning calorimeter, thermal constant analyzer, X-ray diffractometer, and scanning electron microscopy are used to characterize the CPCM. Results show that the supercooling of CPCM decreases from 48 to 10 degrees C, and the latent heat and thermal conductivity of CPCM are 235.40 kJ/kg and 4.086 W/(m center dot K), respectively. Compared with pure AASD, the CPCM loses around 10.7 % latent heat, while the thermal conductivity is boosted for more than eight times. After 300 melting-solidification cycles, the latent heat of CPCM only decreases by 5.9 %. Besides, the 600-h corrosion test demonstrates that the 316 L stainless steel is suitable for manufacturing containers for the CPCM. In sum, the developed CPCM owns low supercooling, high thermal conductivity, high cycle stability, and good material compatibility, and hence has a great potential in the field of building and domestic heating.
Keyword ：
Phase change material Phase change material Supercooling Supercooling Expanded graphite Expanded graphite Nanoparticles Nanoparticles Thermal energy storage Thermal energy storage Aluminum ammonium sulfate dodecahydrate Aluminum ammonium sulfate dodecahydrate
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| GB/T 7714 | Fan, Zhansheng , Lu, Yuanwei , Zhao, Tian et al. Preparation and characterization of an aluminum ammonium sulfate dodecahydrate-based composite phase change material with low supercooling and high thermal conductivity [J]. | CASE STUDIES IN THERMAL ENGINEERING , 2024 , 54 . |
| MLA | Fan, Zhansheng et al. "Preparation and characterization of an aluminum ammonium sulfate dodecahydrate-based composite phase change material with low supercooling and high thermal conductivity" . | CASE STUDIES IN THERMAL ENGINEERING 54 (2024) . |
| APA | Fan, Zhansheng , Lu, Yuanwei , Zhao, Tian , Gao, Qi , Li, Zhengyang , Wu, Yuting . Preparation and characterization of an aluminum ammonium sulfate dodecahydrate-based composite phase change material with low supercooling and high thermal conductivity . | CASE STUDIES IN THERMAL ENGINEERING , 2024 , 54 . |
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