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Chinese Journal of Chemical Engineering 2021年第6期34卷 242-257页

作者： Tongtong Zhang Xiaohui She yulong ding Birmingham Centre for Energy Storage&School of Chemical Engineering University of BirminghamBirmingham B152TTUK

Liquefied natural gas(LNG)is regarded as one of the cleanest fossil fuel and has experienced significant developments in recent *** liquefaction process of natural gas is energy-intensive,while the regasification of LNG gives out a huge amount of waste energy since plenty of high grade cold energy(-160℃)from LNG is released to sea water directly in most cases,and also sometimes LNG is burned for *** the other hand,liquid air energy storage(LAES)is an emerging energy storage technology for applications such as peak load shifting of power grids,which generates 30%-40%of compression heat(-200℃).Such heat could lead to energy waste if not recovered and *** recovery of the compression heat is technically feasible but requires additional capital investment,which may not always be economically ***,we propose a power plant for recovering the waste cryogenic energy from LNG regasification and compression heat from the *** challenge for such a power plant is the wide working temperature range between the low-temperature exergy source(-160℃)and heat source(-200℃).Nitrogen and argon are proposed as the working fluids to address the *** analyses are carried out and the results show that the power plant could achieve a thermal efficiency of 27%and 19%and an exergy efficiency of 40%and 28%for nitrogen and argon,***,with the nitrogen as working fluid undergoes a complete Brayton Cycle,while the argon based power plant goes through a combined Brayton and Rankine ***,the economic analysis shows that the payback period of this proposed system is only 2.2 years,utilizing the excess heat from a 5 MW/40 MWh LAES *** findings suggest that the waste energy based power plant could be co-located with the LNG terminal and LAES plant,providing additional power output and reducing energy waste.

关键词： Waste energy recovery Power plant Liquid air energy storage Liquefied natural gas Integration

A numerical investigation into the solids phase chromatography using a combined continuous and discrete approach

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Particuology 2008年第6期6卷 557-571页

作者： Wei Yang Fang Yang yulong ding Institute of Particle Science & Engineering University of Leeds Leeds LS2 9JT UK On visiting from University of Birmingham Edgbaston Birmingham B15 2TT UK

Solids phase chromatography for particle classification is based on different retention times of particles with different properties when they are elutriated through a confined geometry. This work aims at a fundamental understanding of such a technology by using the combined continuous and discrete method. A packed bed is employed as the model confined geometry. The numerical method is compared first with experimental observations, followed by a parametric analysis of the effects on the flow hydrodynamics and solids behaviour of various parameters including the number of injected particles, the superficial gas velocity, the contact stiffness and the diameter ratio of the packed column to the packed particles. The results show that the modelling captures some important features of the flow of an injected pulse of fine particles in a packed bed. An increase in the number of injected particles or the superficial gas velocity reduces the retention time, whereas the contact stiffness does not show much effect over the range of 5 × 10^2 to 5× 10^4 N/m. It is also found that the effect on the retention time of the diameter ratio of the packed column to the packed particles seems complex showing a non-monotonous dependence.

关键词： Solids phase chromatography Gas-solid two-phase flows Packed bed Combined continuous and discrete method Modelling

Effect of carboxymethyl cellulose on dissolution kinetics of carboxymethyl cellulose-sodium carbonate two-component tablet

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Chinese Journal of Chemical Engineering 2017年第10期25卷 1545-1550页

作者： Changdong Li Carlos Amador yulong ding Institute of Particle Science and Engineering University of Leeds Leeds UK School of Engineering University of Warwick. Coventry. CV4 7AL UK Procter & Gamble Newcastle-Upon-Tyne Innovation Centre Newcastle UK School of Chemical Engineering University of Birmingham Birmingham UK

Sodium carbonate and carboxymethyl cellulose powders are compressed into two-component tablets with three mass ratios,97%:3%,95%:5% and 93%:7%.The dissolution tests for two-component tablets and reference pure sodium carbonate tablets are carried out at various *** dissolution process of each tablet is measured by electrical conductivity tracking method and the concentration of dissolved sodium carbonate is quanti fied with calibrated conductivity-concentration converting equation of sodium *** quanti fied dissolution data is fitted with both surface reaction model and diffusion layer model and the results clearly show that surface reaction model is suggested as the appropriate dissolution model for all measured ***,it is determined that carboxymethyl cellulose is a stable element to remain the dissolution mechanism of tablet *** dissolution rate constant quanti fied with surface reaction model presents that carboxymethyl cellulose-sodium carbonate two-component tablets obtain signi ficant higher dissolution rate constant than pure sodium carbonate tablet and higher proportion of carboxymethyl cellulose leads to apparent higher dissolution rate *** results prove for the usage of carboxymethyl cellulose in most practical applications at a relative low-level,the effect of carboxymethyl cellulose is effective and positive for two-component tablet to enhance the dissolution process and improve dissolution rate constant and this effect is speculated coming from its dynamic physical transforming process in water including dilation and conglutination.

关键词： Carboxymethyl cellulose Sodium carbonate Electrical conductivity Temperature Surface reaction model Dissolution rate constant

An investigation on dissolution kinetics of single sodium carbonate particle with image analysis method

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Chinese Journal of Chemical Engineering 2016年第10期24卷 1487-1496页

作者： Changdong Li Carlos Amador yulong ding Institute of Particle Science and Engineering University of LeedsLeedsUK Procter&Gamble Newcastle-Upon-Tyne Innovation Centre NewcastleUK School of Chemical Engineering University of BirminghamBirminghamUK

Dissolution kinetics of sodium carbonate is investigated with the image analysis method at the approach of single *** dissolution experiments are carried out in an aqueous solution under a series of controlled temperature and p *** selected sodium carbonate particles are all spherical with the same mass and *** dissolution process is quantified with the measurement of particle diameter from dissolution *** concentration of dissolved sodium carbonate in solvent is calculated with the measured diameter of *** surface reaction model and mass transport model are implemented to determine the dissolution mechanism and quantify the dissolution rate constant at each experimental *** to the fitting results with both two models,it is clarified that the dissolution process at the increasing temperature is controlled by the mass transport of dissolved sodium carbonate travelling from particle surface into *** dissolution process at the increasing pH is controlled by the chemical reaction on particle ***,the dissolution rate constant for each single spherical sodium carbonate particle is quantified and the results show that the dissolution rate constant of single spherical sodium carbonate increases significantly with the rising of temperature,but decreases with the increasing of pH conversely.

关键词： Sodium carbonate Single particle Dissolution rate constant Image analysis

Precedence-constrained path planning of messenger UAV for air-ground coordination

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Control Theory and Technology 2019年第1期17卷 13-23页

作者： yulong ding Bin XIN Jie CHEN School of Automation Beijing Institute of Technology Beijing 700087 China Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing Institute of Technology Beijing 100081 China Beijing Advanced Innovation Center for Intelligent Robots and Systems Beijing Institute of Technology Beijing 100081 China

This paper addresses an unmanned aerial vehicle (UAV) path planning problem for a team of cooperating heterogeneous vehicles composed of one UAV and multiple unmanned ground vehicles (UGVs). The UGVs are used as mobile actuators and scattered in a large area. To achieve multi-UGV communication and collaboration, the UAV serves as a messenger to fly over all task points to collect the task information and then flies all UGVs to transmit the information about tasks and UGVs. The path planning of messenger UAV is formulated as a precedence-constrained dynamic Dubins traveling salesman problem with neighborhood (PDDTSPN). The goal of this problem is to find the shortest route enabling the UAV to fly over all task points and deliver information to all requested UGVs. When solving this path planning problem, a decoupling strategy is proposed to sequentially and rapidly determine the access sequence in which the UAV visits task points and UGVs as well as the access location of UAV in the com mu nication n eighborhood of each task point and each UGV. The effectiveness of the proposed approach is corroborated through computational experiments on randomly generated instances. The computational results on both small and large in stances dem on strate that the proposed approach can generate high-quality solutions in a reasonable time as compared with two other heuristic algorithms.

关键词： Air-ground coordination curvature-constrained path planningz precedence constraints Dubins traveling salesman problem

Fabrication of form stable NaCl-Al2O3 composite for thermal energy storage by cold sintering process

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Frontiers of Chemical Science and Engineering 2019年第4期13卷 727-735页

作者： Rilvaminu Suleiman Qinghua Yu yulong ding Yongliang Li Birmingham Centre for Energy Storage School of Chemical EngineeringUniversity of BirminghamBirminghamB152TTUK

A form stable NaCl-Al2O3(50-50 wt-%)composite material for high temperature thermal energy storage was fabricated by cold sintering process,a process recently applied to the densification of ceramics at low temperature 300℃ under uniaxial pressure in the presence of small amount o f transient *** fabricated composite achieved as high as 98.65% of the theoretical *** NaCl-Al2O3 composite also retained the chloride salt without leakage after 30 heating-cooling cycles between 750℃-850℃ together with a holding period o f 24h at 850℃.X-ray diffraction measurements indicated congruent solubility o f the alumina in chloride salt,excellent compatibility o f NaCl with Al2O3,and chemical stability at high *** analysis by scanning electron microscope also showed limited grain growth,high density,uniform NaCl distribution and clear faceted composite structure without *** latent heat storage density o f 252.5J/g was obtained from simultaneous thermal *** strength test showed high sintered strength around 5 GPa after 50 *** composite was found to have fair mass losses due to ***,cold sintering process has the potential to be an efficient,safe and cost-effective strategy for the fabrication of high temperature thermal energy storage materials.

关键词： cold sintering process composite fabrication thermal energy storage phase change materials

Filtration characteristics of a binary multi-layer granular bed flter based on CFD-DEM coupling simulation

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Particuology 2023年第7期78卷 73-85页

作者： Hongsheng ding Qianwei Ma Lige Tong Shaowu Yin Li Wang yulong ding School of Mathematics and Physics University of Science and Technology BejingBejing100083China School of Enengy and Environmental Engineering University of Science and Technology Beijing Beijing100083China Beijing Engineering Research Center for Energy Saving and Environmental Protection University of Science and Technology BejingBeijing100083China Birmingham Centre for Energy Storage University of BirminghamBirmingham B152TTUK

The coupled CFD-DEM method with the JKR(Johnson-Kendall-Roberts)model for describing the contact adhesion of dust to filter particles(FPs)is used to simulate the distribution pattern of dust particle deposition in the granular bed filter(GBF)with multi-layer *** minimum inlet flow velocity must meet the requirement that the contact probability between dust and FPs is in the high contact probability *** air flow forms vortices on the leeward side of the FPs and changes abruptly at the intersection of different particle size FPs *** particles form large deposits at the intersection of the first and second layers and the different particle size filter *** element multilayer GBF can further optimize the bed structure by interlacing filter layers with different particle *** with single particle size multi-layer GBF,the bed pressure drop is reduced by 40.24%-50.65%and the dust removal efficiency is increased by 21.93%-55.09%.

关键词： Granular bed filter EDEM-FLUENT coupling Method Contact adhesion Dust removal efficiency Pressure drop per unit length

Multi-walled carbon nanotubes added to Na_2CO_3/MgO composites for thermal energy storage

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Particuology 2014年第4期12卷 56-60页

作者： Feng Ye Zhiwei Ge yulong ding Jun Yang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of Sciences Institute of Particle Science and Engineering School of ProcessEnvironmental and Materials EngineeringUniversity of LeedsLeeds LS2 9JTUK

Na2CO3/MgO composites with added multi-walled carbon nanotubes （MWCNTs） were prepared and tested as phase change materials （PCMs） for thermal energy storage. Na2CO3/MgO composite PCMs were prepared and their chemical compatibility and thermal stability were studied. MWCNTs introduced with Na2CO3/MgO composite PCMs were also investigated and scanning electron microscopy （SEM） characterization was used to demonstrate the uniform dispersion of MWCNTs in Na2CO3/MgO composite PCMs. The composites with added MWCNTs still display good thermal stability with mass losses lower than 5%. Introducing MWCNTs into composite Na2CO3/MgO PCMs by material formation/calcination *** enhances the thermal conductivity of the composite PCMs. The thermal conductivity of the composite PCMs was found to increase with an increase in the weight fraction of the added MWCNTs and an increase in the testing temperature. This study may present a promising way to prepare high temperature phase change materials with superior properties such as improved thermal stability.

关键词： Phase change materialsCompositeMulti-walled carbon nanotubesThermal conductivityChemical compatibilityThermal energy storage

Numerical simulation of sedimentation of microparticles usingthe discrete particle method

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Particuology 2008年第1期6卷 38-49页

作者： Chane-Yuan Yang yulong ding Dave York Walter Broeckx Institute of Particle Science and Engineering University of LeedsLeeds LS2 9JTUK Procter and Gamble Newcastle Technical Centre Newcastle-upon-Tyne NE12 9TSUK

A mathematical model has been formulated based on the combined continuous and discrete particle method for investigating the sedimentation behaviour of microparticles in aqueous suspensions, by treating the fluid phase as continuous and the particles phase as discrete, thus allowing the behaviour of individual particles to be followed and the evolution of the structure of the particle phase to be investigated as a function of time. The model takes into account most of the prevailing forces acting on individual particles including van der Waals attractive, electrostatic repulsive, gravitational, Brownian, depletion, steric, contact and drag forces. A code has also been developed based on the model. This paper reports some preliminary modelling results of mono-dispersed microparticles settling in aqueous suspensions under various conditions. The results show the short time dynamics of the fluid phase, which has a similar order of magnitude to the particle phase. Such short time dynamics could bear significance to processes such as particle aggregation when their size becomes very small. Preliminary analyses of the results have also been carried out on the evolution of particle settling based on a newly proposed parameter, local normalised volume fraction （LNVF）.

关键词： Numerical modelling Combined continuous and discrete particle method Sedimentation Local normalised volume fraction lnterparticle interactions