检索结果-内蒙古大学图书馆

Accelerated methane storage in clathrate hydrates using surfactantstabilized suspension with graphite nanoparticles

Chinese Journal of Chemical engineering 2020年第4期28卷 1112-1119页

作者： Liang Yang Xin Wang Daoping Liu Guomin Cui Binlin Dou Juan Wang Shuqing Hao Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China School of Environmental and Chemical Engineering Shanghai University of Electric PowerShanghai 200090China National Engineering Research Center of Coal Preparation and Purification China University of Mining&TechnologyXuzhou 221116China

In this study,enhanced kinetics of methane hydrate formation in the sodium dodecyl sulfate(SDS)solution with different concentrations of suspended graphite nanoparticles(GNPs)were investigated at 6.1-9.0 MPa and 274.15 *** GNPs with rough surfaces and excellent thermal conductivity not only provided a considerable number of microsites for hydrate nucleation but also facilitated the fast hydrate heat transfer in the suspension *** a relatively low pressure of 6.1 MPa,the suspension with 0.4 wt%of GNPs exhibited the minimum induction time of 22 min and maximum methane uptake of 126.1 cm3·***,the methane storage performances of the suspensions with higher and lower concentrations of GNPs were not *** the applied pressure,the temperature increase arising from the hydrate heat in the suspension system with the optimized concentration(0.4 wt%)of GNPs was more significant than that in the traditional SDS ***,compared with those of the system without GNPs,enhanced hydration rate and storage capacity were achieved in the suspensions with GNPs,and the storage capacities were increased by 3.9%-17.0%.The promotion effect of GNPs on gas hydrate formation at low pressure is much more obvious than that at high pressure.

关键词： methane storage clathrate hydrates formation kinetics suspension graphite nanoparticles

来源：评论

学校读者我要写书评

暂无评论

Hydrogen Production from Chemical Looping Steam Reforming of Biomass Waste Cooking Oil

SSRN

引用

SSRN 2022年

作者： Zeng, Pingchao Dou, Binlin Zhang, Hua Wang, Yadong Wu, Kai Zhao, Longfei Chen, Haisheng Xu, Yujie School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing100190 China

For highly efficient transformation and utilization of waste cooking oil, a new method for hydrogen production by indirect and auto-thermal chemical looping steam reforming (CLSR) of waste cooking oil (WCO) was developed in this work. In conventional and direct CLSR using WCO at a temperature of 650 °C, gas production, hydrogen selectivity, and fuel conversion were low due to the insufficient amount of reducing Ni and heating. Thus, the reactor temperature was increased to 750 °C to pyrolyze enough reducing gas to reduce OCs. Although 84% WCO conversion and 88% hydrogen selectivity were obtained, the OCs deactivated at the last 15 minutes due to the high-temperature sintering of the reduced Ni particles. On this basis, a new type of indirect CLSR with high-temperature steam-assisted pyrolysis of WCO in a two-stages fixed-bed reactor with high stability was developed, which fitted WCO feeding and avoided OCs sintering. The experimental results show that about 90% WCO conversion and about 89% hydrogen selectivity were obtained in indirect CLSR, and the highest hydrogen yield and selectivity were obtained under the conditions of upper pyrolysis temperature of 800 ℃ with a lower CLSR temperature of 600 ℃ and S/C=4.12. In addition, the effect of in-situ CO 2 capture on indirect CLSR achieves the feasibility of hydrogen production and minus carbon emissions. The multiple cycles experiments of indirect CLSR obtained about 90% hydrogen selectivity and fuel conversion, close to 0 CH 4 selectivity, and 24%~26% steam conversion. © 2022, The Authors. All rights reserved.

关键词： Hydrogen production

来源：评论

学校读者我要写书评

暂无评论

Study on the Catalytic Performance of Nano-Mesoporous Cobalt-Based Catalysts for Glycerol Dry Reforming

SSRN

引用

SSRN 2022年

作者： Dou, Binlin Wang, Yadong Zhang, Hua Wu, Kai Ren, Ruijia Chen, Haisheng Xu, Yujie School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing100190 China

Dry reforming is an efficient utilization technology that can convert CO 2 into high-value-added syngas. In this work, nano-mesoporous CeO 2 -supported Co-based catalysts were successfully prepared by the colloidal solution combustion method and used in glycerol dry reforming (GDR) experiments. The characterization results show that the prepared catalyst has a uniform mesoporous structure, and the Co-Fe-Ce catalyst has a higher specific surface area and stronger metal-support interaction than the Co-Ce catalyst. Thermodynamic analysis was conducted using a non-stoichiometric method methodology based on Gibbs free energy minimization. Catalytic experiments were carried out at 650°C to 800°C. The results showed that the Co-Fe-Ce catalyst exhibited higher activity and selectivity in the GDR reaction, and the glycerol conversion of 7CoFeCe at 750 °C reached 84.8%. The 10 h stability experiment shows that the Fe promoter has a positive effect on the stability of the catalyst. The TPO results indicate that Fe doping can suppress filamentous carbon formation. © 2022, The Authors. All rights reserved.

关键词： Catalyst activity

来源：评论

学校读者我要写书评

暂无评论

Effects of contact angle hysteresis on bubble dynamics and heat transfer characteristics in saturated pool boiling

引用

INTERNATIONAL JOURNAL OF THERMAL SCIENCES 2022年 178卷

作者： Wang, Haoyuan Lou, Qin Liu, Gaojie Li, Ling Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China

As an inherent physical phenomenon of the contact-line motion, the contact angle hysteresis (CAH) has an important effect on dynamic behaviors of bubble/bubbles from a solid surface. In this study, boiling heat transfer considering the CAH is investigated by employing a phase change lattice Boltzmann (LB) model. Effects of the CAH on the bubble/bubbles dynamics during the boiling process and the boiling curves for both the hydrophilic and hydrophobic hysteresis windows are studied in detail. It is found that the bubble base, bubble height and phase change rate increase as the increase of the width of hysteresis window. On the other hand, the pinning of three-phase contact line is observed during the bubble growth processes. And the pinning times increase with the contact angle hysteresis. For the hydrophilic hysteresis window, the bubble completely departs from the heater if a small range of the hysteresis window is considered, while a residual bubble is left when the bubble departs from the heater in the cases of the hysteresis window larger than an approximate critical value of 45 degrees. For the hydrophobic hysteresis window, a residual bubble can be observed regardless of the level of the contact angle hysteresis. The numerical results also indicate that the CAH affects the position of bubbles coalescence. The bubbles merge above the heater for the hydrophilic hysteresis window with a small level of hysteresis. While the bubbles merge on the heater for the hydrophilic hysteresis window with a large level of hysteresis as well as for the hydrophobic hysteresis window. Moreover, as the increase of the width of the hysteresis window, the critical heat flux (CHF) as well as the Leidenfrost temperature (the minimum temperature for film boiling) decrease, and the transition boiling regimes become shorter. Finally, we present the fitting equations between the width of the hysteresis window and the CHF/Leidenfrost temperature. The results show that the CHF and the Leid

关键词： Boiling heat transfer Contact angle hysteresis Boiling curves Bubble dynamics Lattice Boltzmann method

来源：评论

学校读者我要写书评

暂无评论

Fault Diagnosis of Rolling Bearing Using Cnn and Pca Fractal Based on Feature Extraction

SSRN

引用

SSRN 2023年

作者： Xiao, Junqing Li, Chun Yue, Minnan Xu, Zifei Liu, Qingsong School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai200093 China Department of Maritime and Mechanical Engineering Liverpool John Moores University Byrom Street LiverpoolL3 3AF United Kingdom

A novel adaptive decomposition algorithm based on CEMMDAN and fractal dimension is proposed in this study in order to overcome the limitations like redundancy and mode confusion that exist in traditional EMD based algorithms. An intelligent fault diagnosis model is developed based on CNN and the proposed CEMMDAN for improving the performance of states recognition of rolling bearings. all sub-signals generated by CEEMDAN are selected and reconstructed by the PCA and fractal dimension. In the part if feature extraction and pattern recognition, the proposed ICEEMDAN uses CNN to extract advanced features from the reconstructed signal for developing the intelligent diagnosis model. The performance of the proposed method is examined by rolling bearing experiments. The superiority and reliability of the proposed ICEEMDAN method are compared with some CNN-based diagnosis method. Due to the investigation and examination, the proposed ICEEMDAN method has strong robustness even dealing with the noisy testing background. © 2023, The Authors. All rights reserved.

关键词： Empirical mode decomposition

来源：评论

学校读者我要写书评

暂无评论

Effects of microstructured surface and mixed surfactants on the heat transfer performance of pulsed spray cooling

引用

INTERNATIONAL JOURNAL OF THERMAL SCIENCES 2020年 158卷 106530-106530页

作者： Liu, Ni Yu, Zhixiang Zhu, Tanghao Yin, Xiaoming Zhang, Hua Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China

Pulsed spray cooling is a highly promising method for efficiently cooling high heat flux electronic components. In this study, the factors affecting the heat transfer performance of pulsed spray cooling were investigated on a closed pulsed spray cooling experimental system. It was found that a straight fin microstructured surface has a higher heat transfer performance than a smooth surface, but it decreases the surface temperature uniformity. Based on this, the effects of binary mixed surfactants, DuPont Capstone FS-31:Tween 20, FS-31:sodium dodecyl sulfate (SDS), and FS-31:cetyltrimethylammonium bromide (CTAB), on the heat transfer performance and surface temperature uniformity of pulsed spray cooling with a microstructured surface were investigated. The results show that the surface tension and contact angle of 75% FS-31:25% CTAB were the lowest and the heat transfer performance was the highest. The mean surface temperature was 47.26 degrees C and the heat transfer coefficient was 2.02 W/(cm(2)K). Compared with the results without surfactants on microstructured surface, the mean surface temperature was lower by 8.43 degrees C and the heat transfer coefficient was higher by 35.57%. The mixed surfactants greatly improved the temperature uniformity of the microstructured surface, and the maximum surface temperature difference decreased from 1.587 degrees C to 0.471 degrees C.

关键词： Pulsed spray cooling Microstructured surface Mixed surfactants heat transfer performance Temperature uniformity

来源：评论

学校读者我要写书评

暂无评论

Study on Sewage Sludge Drying System with Built-in Solar Drying Bed 3

Study on Sewage Sludge Drying System with Built-in Solar Dry...

引用

3rd International Symposium on Architecture Research Frontiers and Ecological Environment, ARFEE 2020

作者： Gu, Zhipan Yang, Jichun Liu, Jing Tao, Leren Zhang, Ye Huang, Lihao Instiute of Refrigeration and Cryogenics School of Energy and Power University of Shanghai for Science and Technology Shanghai200093 China School of Architecture and Civil Engineering Jiaxing University Jiaxing Zhejiang314001 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai200093 China

In this paper, the renewable energy solar energy is used as the heat source. The combination of solar drying bed and traditional hot air drying can effectively reduce energy consumption and operation cost. The drying chamber is divided into three layers. The top air supply outlet supplies hot air, the middle layer places wet sludge, and the bottom layer uses hot water coil to dry the sludge. The whole drying process is a heat and mass transfer process with convective heat transfer and radiation heat transfer. After analysis and comparison with traditional energy drying, it is found that drying 97.5kg of sewage sludge will save 79% energy, save 12.84 kg of standard coal, reduce 32 kg of carbon dioxide and 1.284 kg of sulphur dioxide. © The Authors, published by EDP Sciences, 2021.

关键词： Drying

来源：评论

学校读者我要写书评

暂无评论

Experiments on vapour-liquid equilibrium of CO2-ionic liquid under flow conditions and influence on its refrigeration cycle

引用

APPLIED THERMAL engineering 2020年 180卷 115865-115865页

作者： Li, Kun Wu, Weidong Wu, Jiawei Liang, Hanxiang Zhang, Hua Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China

CO2 is a potential alternative refrigerant because of its excellent thermodynamic properties and environmental friendliness, but its high operating pressure in the refrigeration cycle limits its wide application. To reduce the operational high pressure of the conventional CO2 compression refrigeration system, a novel CO2 compression-absorption refrigeration system with ionic liquid (IL) as absorbent was proposed. The IL [emim] [Tf2N] was selected and combined with CO2 as a working pair. Experimental investigations on the dynamic vapour-liquid equilibrium of CO2-[emim][Tf2N] under flow conditions and the influence on its refrigeration cycle were conducted. The effects of solution pump frequency, CO2 inlet temperature and pressure, and system pressure ratio on the key parameters such as depressurization amplitude, absorption completion and desorber temperature were investigated. Within the working conditions of this study, the system operational high pressure could be reduced by 29% at most, and the absorption completion of CO2-IL mixture at the absorber outlet could reach about 70%. It was found that both CO2 inlet pressure and temperature had important effects on the key parameters, and a larger pressure ratio could obtain larger depressurization amplitude and absorption completion and lower desorption temperature. These provide a reference for further optimizing system design and improving system performance.

关键词： CO2 Compression-absorption Refrigeration cycle Depressurization Ionic liquid (IL) Vapor-liquid equilibrium

来源：评论

学校读者我要写书评

暂无评论

Fast degradation of nitro and azo compounds in recyclable noble-metal ions systems

引用

IONICS 2020年第3期26卷 1515-1524页

作者： Sun, Li Liu, Xixi Zhang, Hua Dou, Binlin Zhang, Lixin Su, Wenxian Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Jun Gong Rd 516 Shanghai 200093 Peoples R China

The degradation of nitro and azo compounds has attracted wide attention due to their high toxicity and stability in water. Here, we reported the fast degradation of nitro and azo compounds by the direct injection of high-concentration noble-metal ions (Au3+, Ag+, Pd2+, or Pt4+) and discussed the degradation mechanism. The rate constants of the nitro and azo compounds degradation followed the order: K4-NP > K2-NP > K3-NP > K2-NR > K-MR > K-MO, explained by the substituent effect. The maximum of the degradation rate constant could reach up to 16 min(-1), which can be attributed to the atom-nano catalysis motivated by the direct injection of high-concentration ions. Furthermore, based on the method, the highlighted conflicts shown in the nitro and azo compounds degradation could be resolved. Meanwhile, the recovery method (centrifugation, dissolution, and purification) of noble-metal ions was proposed by means of various characterization techniques, and then noble-metal ions were recovered and recycled for five cycles. Obviously, the above degradation technology can have great potential for applications in water pollutant removal and environmental remediation.

关键词： Ions Organic compounds Catalysis Degradation Recycling

来源：评论

学校读者我要写书评

暂无评论

Migration and Transformation of Phosphorus during Hydrothermal Carbonization of Sewage Sludge: Focusing on the Role of pH and Calcium Additive and the Transformation Mechanism

引用

ACS SUSTAINABLE CHEMISTRY & engineering 2020年第21期8卷 7806-7814页

作者： Zheng, Xiaoyuan Jiang, Zhengwei Ying, Zhi Ye, Yutong Chen, Wei Wang, Bo Dou, Binlin Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Heat Transfer & Multiphase Flow Shanghai 200093 Peoples R China

Recovering phosphorus (P) from sewage sludge has been proposed as a promising substitute for phosphate ores, while hydrothermal carbonization (HTC) has emerged as an energy-efficient method for sewage sludge treatment with substantial merits. Migration and transformation of phosphorus in the sludge during HTC is vital for subsequent P recovery. In this study, the role of pH and calcium additive (CaCl2) in the partitioning and transformation of phosphorus species as well as the associated transformation mechanism was investigated via Standards, Measurements, and Testing Program analysis, X-ray diffraction analysis, and the aid of thermochemical equilibrium approach. The results indicated that higher feedwater pH and dosage of CaCl2 favored the enrichment of phosphorus in the hydorchars with R-p > 80%, which was mainly presented as inorganic phosphorus. The obvious transformation from nonapatite inorganic phosphorus to apatite phosphorus was observed, promoting by higher feedwater pH or dosage of CaCl2. Unlike the addition of CaO, Ca-3(PO4)(2), and Ca2P2O7 have been calculated as the main Ca-associated phosphorus compounds at equilibrium state while less hydroxyapatite (Ca-5(PO4)(3)OH) was reported. These findings were confirmed by XRD analyses well. The work described here can provide new insights into the phosphorus recovery from sewage sludge.

关键词： hydrothermal carbonization sewage sludge phosphorus pH calcium chloride thermochemical equilibrium

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：