Dr. Riyi LinProfessor, China University of Petroleum, China
Speech Title: Polygeneration application of co-pyrolysis of oily sludge and biomass for high quality oil, char and gas products
Abstract: Oily sludge refers to the sludge mixed with crude oil, various refined oil residue and other heavy oil, which is widely produced in the process of crude oil exploitation and transportation with output of 5 million tons every year in China. The harmless and recycling utilization of oily sludge has become a significant issue in oil field development. Pyrolysis is a promising technology to treat oily sludge. However, the conventional pyrolysis technology has the problems of high energy consumption, low efficiency and low quality of pyrolysis products, which restrict its further utilization. Co-pyrolysis of biomass and oily sludge for high quality products was proposed to realize the polygeneration utilization of biomass and oily sludge by the complementary of material properties. The mechanism of the co-pyrolysis was investigated based on the effects of biomass components and blending ratio. The quality of oil, char and gas products were significantly improved. The oil has the potential to be used as fuel because of the higher contents of gasoline, kerosene and diesel components. The gas can be used as fuel gas, and the char with better pore structure can be further developed as catalysts or electrode materials. Polygeneration application of co-pyrolysis is a promising technology that can facilitate the development of bioenergy and the clean production of petroleum industry. Currently, how to realize the amplification of the co-pyrolysis technology for industrial application is an urgent problem to be solved.
Keywords: oily sludge; biomass; co-pyrolysis; high quality product; polygeneration application
Dr. Qianjun MaoProfessor, Wuhan University of Science and Technology, China
Dr. Zehui ChangProfessor, Inner Mongolia University of Technology, China
Speech Title: Investigation and Application of A Multi-effect Vertical Concentric Tubular Solar Seawater Distillation Device
Abstract: Research shows that low efficiency and high cost have become the biggest obstacles for solar sea water desalination technology. A novel multi-effect vertical concentric tubular solar seawater distillation device is introduced and constructed in present work. The device consists of several closely spaced concentric stainless-steel pipes, in which the feed sea water gets preheated by hot brine water to guarantee the evaporation efficiency. Apart from this, the latent heat of vapor condensation in the multi-effect mode is re-utilized successful, and result in an increasing total yield. The total fresh water production and the GOR for the four-effect mode can reach 1.04 kg/h and 3.36 at the heat input of 200 W. The fresh water price and the payback period of the device are the most important economic factors for application of any particular desalination technology. The cost of water production is about 8.6 $/ton, thus, the payback period of the device is 5 just years, which implies an excellent application prospects for single family use to rural, arid and remote communities.
Dr. Fuqiang WangProfessor, Harbin Institute of Technology (Weihai), China
Dr. Yanchao MaoAssociate Professor, School of Physics, Zhengzhou University, China
Speech Title: Porous Polymer Thin Films for Mechanical Energy Harvesting and Self-Powered Electronics
Abstract: Triboelectric nanogenerators (TENGs) are promising innovative energy conversion devices that convert mechanical energy to electricity based on triboelectric friction. We developed a series of TENGs based on sponge-like porous polymer thin films such as polydimethylsiloxane (PDMS) and polytetrafluoroethylene (PTFE). The porosity effect on the output performance of the porous TENG was investigated under mechanical impacts. The output voltage of the porous TENG is obvious higher than that of the solid polymer thin film based TENG under the same condition. The porous TENG can also generate considerable electricity by harvesting mechanical energy from human motions. The generated electric energy could instantaneously power some light emitting diodes (LEDs) and other small electronics without any energy storage process. The development of the porous TENGs could open a new avenue toward developing self-powered personal electronics, owing to their flexibility, simple structure, and the ability to harvest mechanical energy from human motions.
Prof. Santiago MadrugaSchool of Aeronautics and Aerospace Engineering, Universidad Politécnica de Madrid, Spain
Speech Title: Enhanced Phase Change Materials for Thermoregulation and Waste Energy Recovery
Abstract: The Phase Change Materials (PCM) take advantage of the latent heat of the solid/liquid transition to store large amounts of thermal energy during melting or release it to the environment during solidification, barely changing their temperature. This thermal stability and storage capability makes these materials more compact and efficient than materials that use sensible heat for energy storage and thermoregulation [1,2].
A significant issue in thermal regulation and energy storage with PCM is their low conductivity. This leads to very long times during the heat storage and discharge phases, reducing their usability and performance. We present three mechanisms to enhance the heat transfer rate suitable for engineering applications. First, we show how the thermocapillary effects are a very efficient mechanism to develop convective heat transfer in microgravity and strongly enhance the performance of PCM based systems, without increasing their mass and volume [3,4]. Second, we use dispersed metallic nanoparticles in PCM to enhance the heat transfer rate, and present an empirical model able to predict the performance of nano-enhanced PCM realistically in a wide range of nanoparticle concentrations, sizes, and types . Third, we show how metallic open foams are can be used in addition to convective heat transport to enhance the heat transfer rate robustly.
Finally, we present how to leverage those enhancing heat transfer mechanisms to improve current PCM designs of micro-energy harvesters. The motivation comes from the need to power low consume electronics; such as wireless sensors to monitor environmental variables, industrial processes, health parameters, etc., in places where conventional batteries are impractical. Among the different technologies aimed at power low consume sensors - as solar cells, piezoelectric devices, electrostatic methods, etc.- thermoelectric energy harvesting is one of the best solutions to create autonomous monitoring sensors. Efficient TEGs require a substantial temperature difference across the device structure. This has restricted their use to applications where a hot metal surface is available . We show how coupling thermoelectric generators with PCMs in micro-energy harvesters can increase the electric energy output an order of magnitude with respect to conventional designs. In particular, we pay special attention to designs of autonomous micro-harvesters to power sensors for structural health monitoring systems in aircraft, monitoring in spacecraft, as well as humidity and temperature in soils.
Keywords: Phase Change Materials, nanoparticles, thermoelectric generators, micro-energy harvesting
Jizhong ZhuSouth China University of Technology, China
Jan KazakWroclaw University of Environmental and Life Sciences, Poland
Speech Title: A decision support system for the planning of hybrid renewable energy technologies
Abstract: Implementation of renewable energy resources (RES) with the use of knowledge-based approach requires systems which enable to combine data from different databases in order to multidimensional character of analysed factors. Therefore, this study provides the decision support system for the planning of hybrid renewable energy technologies designed for regional authorities. The system in this research integrates two RES: solar and wind. Moreover, it combines energy potential data with administrative division and data on land cover. Presented functionality shows the ability of single-element filtering as well as multi-element filtering which gives the opportunity visual data discovery. The novel decision support system designed in this research can constitute an effective instrument, which can help regional decision-makers to locate single-source as well as hybrid RES installations to meet the requirements of renewable energy production. The systems were designed for the case of Lubuskie Voivodeship (Poland). However, besides the fact of customized system for one region, the use of universal databases allows to prepare similar tool for any other region in European Union.
Dr. Mohd Radzi Abu MansorNational University of Malaysia, Malaysia
Speech Title: Performance and Emission of Biodiesel Fuel with Various Additives in Direct Injection Diesel Engine
Abstract: Alternative fuels for diesel engines have become highly important in the automotive industry due to the depleting fossil fuel sources and increased environmental concerns. Global warming concerns due to the production of greenhouse gases (GHGs) have seen as one of a major factor in the promotion of using biodiesel. Biodiesel can be used as an alternative fuel for the diesel engine and have a good combustion characteristic because of their long-chain hydrocarbon structure. However, biodiesel possesses few disadvantages such as lower heating value, higher viscosity, much high density and not able to flow at low temperature, these can contribute to several engine problems such as low atomization during injection, carbon deposit formation and injector clogging. There are many types of additives on the market but the extent of the additives on engine performance is unknown and lack of research has been done in studying the performance, emissions and fuel consumption of B100 biodiesel. There is five B100 biodiesel, but the content of additives and composition is left unknown. Therefore, the purpose of this research is to identify individual composition in each biodiesel samples, such as the identification of additives and fatty acids methyl esters using gas chromatography (GC-FID). The experimental measurements of density, viscosity and calorific value of B100 biodiesel were being conducted. The results showed that a blend of biodiesel with diethyl ether and n-butanol has the closest calorific value to fuel diesel followed by the combination additives of ethanol, butanol and methyl pyrrolidone. The samples that met the specifications of ASTM D6751 were conducted using simulation CONVERGE CFD software; based on single-cylinder, direct injection, YANMAR TF90 diesel engine parameters. The computational domain was constructed based on engine geometry and compression ratio measurements. Engine performance and emission concentrations are investigated by determining the brake specific fuel consumption (BSFC), brake thermal efficiency, CO, HC, NOx and gas emissions using simulation. Performance results show that the combination of diethyl ether and n-butanol as an additive with crude palm oil will give a higher brake power as well as lower NOx and brake specific fuel consumption among the 5 samples. The emission studies revealed that the addition of n-butanol additive can reduce carbon monoxides (CO), nitrogen oxides (NOx), particulate matter (PM) emission while diethyl ether can improve the spray characteristics when it blends with B100 biodiesel due to its low density and viscosity.
Keywords: palm oil methyl ester; direct injection; biodiesel; performance; emission; additives
Jidong KangNational University of Singapore, Singapore
Nambua Elizabeth NtekaCape Peninsula University of Technology, South Africa
Dr. Chunyun WangTsinghua-Berkley Shenzhen Institute at Tsinghua University, China
Speech Title: Efficient lead-free warm-white emitting double perovskite quantum dots for white LEDs
Abstract: Artificial light sources play an indispensable role in daily life. Around 1/6 to 1/5 of the worldwide electricity is consumed by lighting.  These lighting sources do not only need to be efficient and reliable, but high light quality is also demanded. Quantum-dot based light emitting diodes (QLED) have higher efficiency, stability, longer lifetime and wider color gamut, compared to organic light emitting diodes. Metal halide perovskite quantum dots have gained great attention for LED research, due to their high photoluminescence quantum yield, low-cost solution processability and high tunability of emission across the entire visible spectrum. [2-3] However, the toxicity and instability of lead-containing halide perovskites against moisture and air prevent further practical applications. Highly efficient lead-free halide perovskite quantum dots are still very limited, especially for single white-emitting perovskites. The efficiency and color stability of LED devices can be improved by using a single-phase white-light emitter, as it can avoid the self-absorption and color instability problems in mixed and multiple emitters.
Here we report a highly efficient lead-free warm-white emitting quantum dot Cs2Ag0.4Na0.6InCl6, crystallizing in a lead-free double perovskite Cs2AgInCl6 structure, doped with rare earth and transition metal ions. We will talk about the synthesis and luminescence properties of the perovskite quantum dots. The influence of quantum dot structure on the luminescence properties will be discussed, and the emission mechanism will be clarified by DFT calculations. Finally, the application of the white light quantum dots in QLED devices is evaluated.
Vladimir MesserleRussia and Combustion Problems Institute, Kazakhstan
Dr. Pablo MartinDepartment of Physics, University of Antofagasta, Chile
Speech Title: Improved analytic solution for the joint sheath and presheath potentials
Abstract: An analytic function is presented as a joint solution for the wall potential in both sheath and presheath region. The solution is designed as a bridge joining the conditions imposed by the Bohm differential equation near the wall, and those due to the plasma, where the potential an electric field must be zero. The new proposed function allows to determine the characteristic Bohm velocity, once the wall potential is given. The results now obtained are physically more convenient than those could be obtained through a recent publication . The parameters of the new potential are derived by the analysis of the Bohm differential equation near the wall. However the later unphysical behavior of the exact solution of this differential equation further away of the wall, is not present now.
 P. Martin, F. Maass, F. Calderon and F. Lastra, Physica Scripta 94 (2019) 015602.
Prof. Xinhai XuHarbin Institute of Technology, China
Speech Title: Experimental and numerical investigation on hydrogen production via a novel multichannel methanol steam reformer for HT-PEMFC
Abstract: Fuel cells attract a lot of attention recently as the promising next generation electric vehicle technology. However, one of the major obstacles for commercialization of fuel cell vehicles in China is the difficulty regarding with hydrogen refuelling and storage due to lack of infrastructures. On-site hydrogen production by methanol steam reforming (MSR) is one of the possible methods to solve this problem due to the ease of liquid methanol refueling and storage, as well as high yield of hydrogen and low generation of CO (<1 vol%) in the reformate. The high temperature proton exchange membrane fuel cell (HT-PEMFC) can directly use the reformate as fuel gas since it can tolerate CO concentration up to 3 vol.% at operating temperature around 160 oC. In this study, a novel multichannel micro packed bed reactor with bifurcation inlet manifold and rectangular outlet manifold was developed to improve the MSR performance. The commercial CuO/ZnO/Al2O3 catalyst particles were directly packed in the reactor. The flow distribution uniformity in the reactor was optimized numerically. Experiments were conducted to study the influences of steam to carbon molar ratio (S/C), weight hourly space velocity (WHSV), reactor operating temperature (T) and catalyst particle size on the methanol conversion rate, H2 production rate, CO concentration in the reformate, and CO2 selectivity. A three-dimensional numerical model was established to study the heat and mass transfer characteristics as well as the chemical reaction rates. The model adopted a triple rate kinetic model which can accurately calculate the consumption and generation of each species during methanol steam reforming process in the reactor, which was validated by experimental data. The distributions of temperature, velocity, species concentration, and reaction rates in the reactor were obtained and analyzed to explain the mechanisms of different effects. The results show that increase of the S/C and T, as well as decrease of the WHSV and catalyst particle size, both enhance the methanol conversion. The CO concentration decreases as the S/C and WHSV increase as well as the T and catalyst particle size decrease. Moreover, T plays a more important role on the methanol steam reforming performance than WHSV and S/C. The impacts on CO concentration become insignificant when the S/C is higher than 1.3, WHSV is larger than 1.34 h-1 and T is lower than 275 °C. A long term stability test of this reactor was also performed for 36 h and achieved high methanol conversion rate above 94.04% and low CO concentration less than 1.05% under specific operating conditions
Dr. Carlos Pastor FernandezUniversity of Warwick, UK
Speech Title: A Comparison between Electrochemical Impedance Spectroscopy and Incremental Capacity-Differential Voltage as Li-ion Diagnostic Techniques to Identify and Quantify the Effects of Degradation Modes within Battery Management Systems
Abstract: Degradation of Lithium-ion batteries is a complex process that is caused by a variety of mechanisms. For simplicity, ageing mechanisms are often grouped into three degradation modes (DMs): conductivity loss (CL), loss of active material (LAM) and loss of lithium inventory (LLI). State of Health (SoH) is typically the parameter used by the Battery Management System (BMS) to quantify battery degradation based on the decrease in capacity and the increase in resistance. However, the definition of SoH within a BMS does not currently include an indication of the underlying DMs causing the degradation. Previous studies have analysed the effects of the DMs using incremental capacity and differential voltage (IC-DV) and electrochemical impedance spectroscopy (EIS). The aim of this study is to compare IC-DV and EIS on the same data set to evaluate if both techniques provide similar insights into the causes of battery degradation. For an experimental case of parallelized cells aged differently, the effects due to LAM and LLI were found to be the most pertinent, outlining that both techniques are correlated. This approach can be further implemented within a BMS to quantify the causes of battery ageing which would support battery lifetime control strategies and future battery designs.
Dr. Gaoyang HouNorthwest A&F University, China