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Optimization of Operation Strategies for a Combined Cooling, Heating and Power System based on Adiabatic Compressed Air Energy Storage

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Journal of Thermal Science 2020年第5期29卷 1135-1148页

作者： CHEN Shang zhu tong GAN Zhongxue zhu Xiaojun LIU Liuchen School of Mechanical and Energy Engineering Tongji UniversityShanghai 201804China ENN Science and Technology development Co. Ltd.Langfang 065000China

The fluctuations of renewable energy and various energy demands are crucial issues for the optimal design and operation of combined cooling,heating and power(CCHP)*** this paper,a novel CCHP system is simulated with advanced adiabatic compressed air energy storage(AA-CAES)technology as a join to connect with wind energy generation and an internal-combustion engine(ICE).The capital cost of utilities,energy cost,environmental protection cost and primary energy savings ratio(P E S R)are used as system performance *** fulfill the cooling,heating and power requirements of a district and consider the thermal-electric coupling of ICE and AA-CAES in CCHP system,three operation strategies are established to schedule the dispatch of AA-CAES and ICE:ICE priority operation strategy,CAES priority operation strategy and simultaneous operation *** strategy leads the operation load of AA-CAES or ICE to improve the energy supply efficiency of the ***,to minimize comprehensive costs and maximize the P E S R,a novel optimization algorithm based on intelligent updating multi-objective differential evolution(MOde)is proposed to solve the optimization *** the multi-interface characteristic and active management ability of the ICE and AA-CAES,the economic benefits and energy efficiency of the three operation strategies are compared by the simulation with the same system *** a typical summer day,the simultaneous strategy is the best solution as the total cost is 3643 USD and the P E S R is 66.1%,while on a typical winter day,the ICE priority strategy is the best solution as the total cost is 4529 USD and the P E S R is 64.4%.The proposed methodology provides the CCHP based AA-CAES system with a better optimized operation.

关键词： combined cooling heating and power(CCHP)system advanced adiabatic compressed air energy storage(AA-CAES) optimization

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The Impact of the Storm-Induced SST Cooling on Hurricane Intensity

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Advances in Atmospheric Sciences 2006年第1期23卷 14-22页

作者： tong zhu Da-Lin ZHANG CIRA/CSU at NOAA/NESDIS/ORA Camp Springs MD 20746 USA department of Meteorology University of Maryland College Park MD 20742 USA

The effects of storm-induced sea surface temperature （SST） cooling on hurricane intensity are investigated using a 5-day cloud-resolving simulation of Hurricane Bonnie （1998）. Two sensitivity simulations are performed in which the storm-induced cooling is either ignored or shifted close to the modeled storm track. Results show marked sensitivity of the model-simulated storm intensity to the magnitude and relative position with respect to the hurricane track. It is shown that incorporation of the storm-induced cooling, with an average value of 1.3℃, causes a 25-hPa weakening of the hurricane, which is about 20 hPa per 1℃ change in SST. Shifting the SST cooling close to the storm track generates the weakest storm, accounting for about 47% reduction in the storm intensity. It is found that the storm intensity changes are well correlated with the air-sea temperature difference. The results have important implications for the use of coupled hurricane-ocean models for numerical prediction of tropical cyclones.

关键词： SST feedback hurricane intensity numerical modeling

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Influence of Fill Point in Multiple-Heat-Sources Looped District Heating System with Distributed Variable-Speed Pumps

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Journal of Thermal Science 2020年第5期29卷 1206-1222页

作者： XU tong YAN Jing WANG Xinlei WANG Hai zhu tong WANG Haiying Beijing Huajian Power design and Research Institute Beijing 101400China School of Mechanical Enginecring Tongji UniversityShanghai 200092China

When regulating a pipe network according to user demand,hydraulic balance and power consumption are crucial factors for a multi-source looped-pipe network applying distributed variable-speed pumps compared to the conventional central circulating pump *** this paper,the influence of the fill point on power consumption and hydraulic balance of the multi-source looped-pipe network was studied.A mathematical model for electricity energy consumption analysis was built and calculated for a large sized looped-pipe network with multiple heat sources and distributed variable-speed *** hydraulic calculation models of each single element,such as pipe,distribution pump,valve,replenishment pump,heat source and substation,were built.A case located in dezhou city,China was *** results showed that:the maximum power saving(39.2%)could be achieved when each heat source had its own fill point,but the heat sources would not meet their design flows;to meet the design flows of all the heat sources,only one fill point should be necessarily located near the heat source with the lowest flow rate to get the expected hydraulic stability and energy saving.

关键词： district heating central circulating pump distributed variable-speed pumps fill point energy saving

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Dataset of human motion status using IR-UWB through-wall radar

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Journal of Systems Engineering and Electronics 2021年第5期32卷 1083-1096页

作者： zhu Zhengliang YANG degui ZHANG Junchao tong Feng Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education Xia-men UniversityXiamen 361005China School of Aeronautics and Astronautics Central South UniversityChangsha 410083China College of Ocean and Earth Sciences Xiamen UniversityXiamen 361005China

Ultra-wideband(UWB)through-wall radar has a wide range of applications in non-contact human information detection and *** the integration of machine learning technology,its potential prospects include the physiological monitoring of patients in the hospital environment and the daily monitoring at *** many target detection methods of UWB through-wall radar based on machine learning have been proposed,there is a lack of an opensource dataset to evaluate the performance of the *** published dataset is measured by impulse radio UWB(IR-UWB)through-wall radar *** test subjects are measured in different environments and several defined motion *** the presented dataset,we propose a human-motion-status recognition method using a convolutional neural network(CNN),and the detailed dataset partition method and the recognition process flow are *** the well-trained network,the recognition accuracy of testing data for three kinds of motion status is higher than 99.7%.The dataset presented in this paper considers a simple ***,we call on all organizations in the UWB radar field to cooperate to build opensource datasets to further promote the development of UWB through-wall radar.

关键词： impulse radio ultra-wideband(IR-UWB) through-wall radar human motion status dataset convolutional neural network(CNN)

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Effects of Pilot Fuel Ratio on Combustion Process:Flow Field Structure and Pollutant Emissions

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Journal of Thermal Science 2023年第6期32卷 2321-2335页

作者： ZONG Chao JI Chenzhen CHENG Jiaying zhu tong Postdoctoral Station of Mechanical Engineering Tongji UniversityShanghai201804China School of Mechanical Engineering Tongji UniversityShanghai201804China

As the only controllable means of a micro gas turbine(MGT)combustor during unit operation,pilot fuel ratio(PFR)is the key to achieving stable combustion and low pollutant *** paper discusses the influence of PFR on the inner flow field structure and pollutant *** steady-state three-dimensional RANS method with a 40-step reduced methane-air kinetics mechanism is used to study the reaction flow field and species field with PFR of 9.0%,12.7%,15.2%and 17.6%.Results show that,with the decrease in PFR,the axial velocity and temperature near the central axis of the combustion chamber show a tendency to decrease.A similar separation phenomenon occurred in the core pyrolysis reaction zone(measured by HCO)and oxidation zone(measured by OH),which is more conducive to promoting the oxidation of *** quantitative effect of the pilot flame on nitrogen oxides(NO_(x))was separated by using inert gas instead of nitrogen in combustion *** was found that the NOx produced by the pilot flame under the operation condition with a PFR of 9.0%was 3.2×10^(−6),accounting for 17.4%of the total NOx emission,which was twice that of PFR.

关键词： micro gas turbine pilot fuel ratio flow field structure carbon monoxide nitrogen oxide

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detection and Classification of Small Traffic Signs Based on Cascade Network

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Chinese Journal of Electronics 2021年第4期30卷 719-726页

作者： ZHANG Shufang WANG Qinyu zhu tong LIU Yuhong School of Electrical and Information Engineering Tianjin University department of Computer Science and Engineering Santa Clara University

Research on the traffic sign detection is significant for driverless technology, which provides useful navigation information. Existing object detection methods are only applicable to large-size objects or small-scale specific types of traffic signs, and the performance of detecting traffic signs in street views is not adequate. In this regard, we propose a method to detect and classify small traffic signs by constructing a cascaded ***, the RetinaNet network is adopted firstly to integrate multi-layer information to identify small traffic signs in traffic scene images. The focal loss function is used to balance the biased distribution of traffic sign ***, a two-class network is cascaded after the RetinaNet,which helps identify valid traffic signs from the first-stage prediction results. Experiments show that our cascaded network structure could achieve the balance of different categories of predictions and an improvement in precision and recall.

关键词： Feature extraction Image classification Object detection Transportation industry

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Effect of Al2O3 doping on the structure and performance of an Al2O3/Fe2O3 catalyst for mercury oxidation

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Journal of Environmental Sciences 2020年第4期32卷 138-145页

作者： Ruihui Liu Tingyu zhu Li tong Wenqing Xu School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China Research Center for Process Pollution Control National Engineering Laboratory for Hydrometallurgical Cleaner Production TechnologyInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004China department of Air Pollution Control Beijing Municipal Institute of Labor ProtectionBeijing 100054China

In this study,the thermal stability of a Fe2 O3 catalyst for mercury oxidation was significantly improved by doping with Al2 *** 1 hr,the catalyst doped with 10 wt.%Al2 O3 still exhibited a mercury conversion efficiency of 70.9%,while the undoped sample even lost its catalytic *** with Al2 O3 retarded the collapse of the catalyst mesoporous structure during high-temperature calcination,and the doped samples maintained a higher specific surface area,smaller pore size,and narrower pore size *** electron microscope images revealed that after calcination at 350℃,the average size of the catalyst grains in Fe2 O3 was 23.4 nm;however,the corresponding values for 1%Al2 O3/Fe2 O3,3%Al2 O3/Fe2 O3,and 10%Al2 O3/Fe2 O3 were only 13.3,7.1,and 4.7 nm,*** obtained from X-ray diffraction and thermogravimetry coupled with differential scanning calorimetry confirmed that doping with Al2 O3 also retards the crystallization of the catalysts at high temperature,constraining catalyst grains to a smaller size.

关键词： Mercury Catalytic oxidation Fe2O3 Al2O3 Thermal stability

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Advancing from unimechanism polymerization to multimechanism polymerization: binary polymerization

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Science China Chemistry 2022年第3期65卷 602-610页

作者： Ning Ren Mengqi Ge Gangsheng tong Xinyuan zhu School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China

Polymerizations with multiple mechanisms performed simultaneously are promising but very challenging. As the key limitation,the complicated mutual influence between different mechanisms can be hardly defined and measured. Herein we establish a universal framework for the assessment of mutual influence between different mechanisms using binary polymerization for demonstration. The kinetics and thermodynamics of polymerization with two mechanisms are compared with the corresponding homopolymerization and the difference is expressed by a hybrid function. The hybrid function is composed of a hybrid parameter that describes the extent of mutual influence and a function that describes necessary conditions for mutual influence to occur. The extent of mutual influence can be calculated using kinetic and thermodynamic data without details of reaction mechanisms, for the first time providing a straightforward method to assess the mutual influence between different polymerization *** envision that the method has potential in more complex systems with multiple mechanisms/monomers with mutual influence.

关键词： binary polymerization multimechanism polymerization hybrid function hybrid parameter hybrid polymerization

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Concentration-dependent effects of reductive pulmonary inhalants on ultrafine particle-induced oxidative stress:Insights for health risk assessment

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Environmental Science and Ecotechnology 2024年第3期19卷 118-124页

作者： Ya-qi Yu tong zhu BIC-ESAT and SKL-ESPC College of Environmental Sciences and EngineeringPeking UniversityBeijing100871PR China School of Environmental Science and Engineering Qingdao UniversityQingdao266071PR China

The impact of reductive pulmonary inhalants on ultrafine particles(UFPs)-induced pulmonary oxidative stress remains a crucial consideration,yet the concentration-dependent effects of these inhalants have remained *** we synthesized composite UFPs simulating atmospheric UFPs,primarily composed of metals and *** subjected these UFPs to varying concentrations(0e7000 mM)of two reductive pulmonary inhalants,N-acetylcysteine and salbutamol,to assess their influence on oxidative potential,measured through the dithiothreitol assay(OP^(DTT)).Simultaneously,we analysed the soluble metal content of UFPs to uncover potential relationships between oxidative potential and metal *** results unveil a dual role played by these inhalants in shaping the OPDTT of composite ***,OP^(DTT) generally increased as inhalant concentrations rose from 0 to 300 ***,an intriguing reversal occurred when concentrations exceeded 500 mM,resulting in a decline in *** to untreated UFPs,these inhalants induced promotion and inhibition effects within concentration ranges of 100e500 and>1000 mM,*** no significant correlation emerged between OP^(DTT) and soluble metal content as inhalant concentrations ranged from 0 to 7000 mM,noteworthy positive correlations emerged at lower inhalant concentrations(e.g.,N-acetylcysteine at 0 e300 mM).These findings provide insights into the potential influence of reductive pulmonary inhalants on health risks associated with UFP exposure,further underscoring the need for continued research in this critical area.

关键词： Concentration-dependent effects Oxidative potential Reductive pulmonary inhalants Soluble metals Simulated atmospheric ultrafine particles

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Laser irradiation induced spectral evolution of the surface-enhanced Raman scattering(SERS) of 4-tert-butylbenzylmercaptan on gold nanoparticles assembly

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Science China Chemistry 2007年第4期50卷 520-525页

作者： tong LianMing zhu Tao LIU ZhongFan Center for Nanoscale Science and Technology College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The spectral evolution of the surface-enhanced Raman scattering (SERS) of 4-tert-butylbenzylmer-captan (4-tBBM) on gold nanoparticles assembly under laser irradiation is reported. The relative intensities of typical peaks in the spectrum of 4-tBBM gradually change with irradiation time. Comparison of the rate of spectral changes under several experimental conditions indicates that the surface plasmon resonance (SPR) induced heat in the gold nanoparticles assembly is the origin of the spectral evolution. During the process of self-assembly, 4-tBBM molecules do not form a compact ordered monolayer because of the spatial hindrance of the 4-tert-butyl end group. The heat induced by laser irradiation drives the 4-tBBM molecules to rearrange to a more stable orientation.

关键词： surface-enhanced Raman scattering(SERS) spectral evolution surface plasmon resonance(SRP) thermal effect

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