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High-entropy(Sm_(0.2)Eu_(0.2)Gd_(0.2)Dy_(0.2)Er_(0.2))_(2)Hf_(2)O_(7) ceramic with superb resistance to radiation-induced amorphization

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Journal of Materials Science & Technology 2023年第24期155卷 1-9页

作者： Jingxin Wu Meng Zhang Zhanqiang Li Minzhong Huang Huiming Xiang Liyan Xue Zhengming Jiang Zhigang Zhao Lianfeng Wei Yong Zheng Fan Yang Guang Ran Yanchun Zhou Heng Chen School of Rare Earths University of Science and Technology of China Hefei 230026 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou 341000 China Xiamen Institute of Rare Earth Materials Haixi Institute Chinese Academy of Sciences Xiamen 361021 China Fujian Province Joint Innovation Key Laboratory of Fuel and Materials in Clean Nuclear Energy System Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108 China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials & Processing Technology Beijing 100076 China The Key Nuclear Fuel and Nuclear Materials Laboratory of China Nuclear Power Institute of China Chengdu 610213 China China Rare Earth Group Co. Ltd. Chengdu 610213 China College of Energy Xiamen University Xiamen 361102 China School of Materials Science and Engineering Zhengzhou University Zhengzhou 450001 China

Nuclear engineering materials are required to possess outstanding extreme environmental tolerance and irradiation resistance.A promising novel pyrochlore-type of(Sm_(0.2)Eu_(0.2)Gd_(0.2)Dy_(0.2)Er_(0.2))2 Hf_(2)O_(7)high-entropy ceramic(HE-RE2 Hf_(2)O_(7))for control rod was prepared by solid-state reaction *** ion irradiation of HE-RE_(2) Hf_(2)O_(7)with 400 keV Kr+at 400℃was investigated using a 400 kV ion implanter and compared with single-component pyrochlore Gd2 Hf_(2)O_(7)to evaluate the irradiation *** HE-RE2 Hf_(2)O_(7),the phase transition from pyrochlore to defective fluorite is revealed after irradiation at 60 *** irradiation at 120 dpa,it maintained crystalline,which is comparable to Gd2 Hf_(2)O_(7)but superior to the titanate pyrochlores previously ***,the lattice expansion of HE-RE2 Hf_(2)O_(7)(_(0.2)2%)is much lower than that of Gd2 Hf_(2)O_(7)(0.62%),indicating excellent irradiation damage *** tests displayed an irradiation-induced increase in hardness and a decrease in elastic modulus by about 2.6%.Irradiation-induced segregation of elements is observed on the surface of irradiated *** addition,HE-RE2 Hf_(2)O_(7)demonstrates a more sluggish grain growth rate than Gd2 Hf_(2)O_(7)at 1200℃,suggesting better high-temperature *** linear thermal expansion coefficient of HE-RE2 Hf_(2)O_(7)is 10.7×10-6 K-1 at 298–1273 *** general,it provides a new strategy for the design of the next advanced nuclear engineering materials.

关键词： High-entropy ceramic Rare earth hafnate Ion irradiation Amorphization resistance High temperature stability Nuclear safety

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Recent advances in the development of photocatalytic technology for nitrate reduction to ammonia

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Case Studies in Chemical and Environmental Engineering 2023年 8卷

作者： Wahyudi, Farizky Saputera, Wibawa Hendra Sasongko, Dwiwahju Devianto, Hary Research Group on Energy and Chemical Engineering Processing System Department of Chemical Engineering Faculty of Industrial Technology Institut Teknologi Bandung Jl. Ganesha no. 10 Bandung 40132 Indonesia Center for Catalysis and Reaction Engineering Institut Teknologi Bandung Jl. Ganesha no. 10 Bandung 40132 Indonesia Research Center for New and Renewable Energy Institut Teknologi Bandung Jl. Ganesha no. 10 Bandung 40132 Indonesia

The pursuit of achieving net zero emissions by 2050, a target established following the adoption of the SDGs in 2015, has had a significant impact on the industrial sector. The conventional method for producing ammonia (NH₃) known as the Haber-Bosch process, currently employed for commercial purposes, has adverse environmental effects and is not economically feasible due to its high operating temperatures and pressures (approximately 500 °C and 200 MPa). This results in the generation of substantial CO₂ emissions, inefficient energy usage, and unsustainable reliance on fossil-based raw materials. To address this, researchers are focusing on alternative methods for converting nitrates to ammonia, given that nitrates are pollutants stemming from agriculture, power generation, and related industrial activities. One promising approach under development is photocatalysis which employs solar energy and catalyst to convert nitrates into ammonia using more environmentally friendly and cost-effective means. This review paper provides an extensive and detailed exploration of the reduction of nitrate to ammonia through photocatalytic technology. The discussion encompasses various aspects including thermodynamics and kinetics, photocatalysts development, factors affecting the ammonia production efficiency, the detailed mechanism behind ammonia production based on experimental and DFT calculations approach, challenges, and prospective areas of advancement based on earlier research. In essence, this comprehensive review steers researchers toward the necessary future endeavors that are essential for the broad adoption of the photocatalytic method in addressing nitrates as toxic pollutants. © 2023 The Authors

关键词： Ammonia CO2 emission Environmental Nitrate Photocatalytic

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Membrane Contactor-Photocatalytic Hybrid system for Carbon Dioxide Capture and Conversion to Formic Acid

SSRN

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SSRN 2023年

作者： Astuti, Andi Rina Ayu Saputera, Wibawa Hendra Ariono, Danu Wenten, I. Gede Sasongko, Dwiwahju Department of Chemical Engineering Faculty of Industrial Technology Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia Research Group on Energy and Chemical Engineering Processing System Department of Chemical Engineering Faculty of Industrial Technology Institut Teknologi Bandung Jl. Ganesha no. 10 Bandung40132 Indonesia Center for Catalysis and Reaction Engineering Institut Teknologi Bandung Jl. Ganesha no. 10 Bandung40132 Indonesia Research Center for New and Renewable Energy Institut Teknologi Bandung Jl. Ganesha no. 10 Bandung40132 Indonesia Research Center for Nanosciences and Nanotechnology Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia

This research explores various CO2 absorbents and catalysts that revealed the CO2 capture results in CO2 loading of 0.957 mole of CO2/mole of solvent using TEA and 0.75 moles of CO2/mole of solvent using NaOH for 4 h. Subsequently, CO2 underwent successful photo-reduction, yielding formic acid of 15.89 ppm using ZnO and 10.16 ppm using TiO2 within the exact operation of 4 h at a gas flow rate of 800 ml/min. Key parameters include the energy source, with optimal conditions identified as a UV source of 500 W, a medium pH of 10, and a catalyst loading of 0.5 g/L. © 2023, The Authors. All rights reserved.

关键词： Carbon dioxide

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Crystallization of potassium chloride from its solution containing sodium chloride with alcohol addition

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AIP Conference Proceedings 2024年第1期3073卷

作者： Wibawa Hendra Saputera Herri Susanto Jonathan Maximilian Surya Atmaja Amarthya Benigna Achmadi Research Group on Energy and Chemical Engineering Processing System Department of Chemical Engineering Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung West Java 40132 Indonesia Center for Catalysis and Reaction Engineering Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung West Java 40132 Indonesia Research Center for New and Renewable Energy Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung West Java 40132 Indonesia

Aligning with the government’s target to increase the renewable energy mix to 31% by 2050, the usage of biomass waste in Indonesia has increased as an alternative to fossil fuels through combustion and has been considered to be carbon neutral. Empty Fruit Bunch (EFB) is a solid waste produced by the palm oil industry. The ash extract from the combustion of EFB contains a high amount of alkali metals including potassium, a crucial element to produce fertilizer. Indonesia is still a net importer of fertilizer, therefore the utilization of extracted potassium from the ash would be beneficial to reduce the import quantity of fertilizer. However, potassium is commonly present as a mixture with sodium salts that have the same solubility range in water at room temperature. Some organic compounds, specifically alcohols, can decrease the solubility of many kinds of salts. This research is therefore focused on understanding the effect of alcohol added to the potassium recovery, in the form of KCl, from its solution containing NaCl through crystallization with alcohol addition whilst obtaining the solubility of the salts in alcohol concentration and temperature variations. The largest reduction of KCl solubility was obtained by the addition of propanol up to 50%-wt. of solvent, resulting in an 88.01% decrease. To identify the recovered crystal, the experiment used Inductively Coupled Plasma (ICP) instrument. The highest purity and yield of KCl were obtained through the addition of propanol up to 50%-wt. of solvent, which was 88.85% and 52.65%, respectively.

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Simulation of photocatalytic degradation of methylene blue using titanium dioxide (TiO2) P25 as a photocatalyst

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AIP Conference Proceedings 2024年第1期3073卷

作者： Wibawa Hendra Saputera Dwiwahju Sasongko Pramujo Widiatmoko Nitya Yatasha Dewi Awanis Mazayasina Ardhistira Research Group on Energy and Chemical Engineering Processing System Department of Chemical Engineering Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung West Java 40132 Indonesia Center for Catalysis and Reaction Engineering Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung West Java 40132 Indonesia Research Center for New and Renewable Energy Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung West Java 40132 Indonesia

The annual production of textile dyes exceeds 70,000 per year, with nearly 200,000 tons of synthetic dyes being released into the environment due to inefficient dyeing methods used by textile industries. The contamination of water bodies by textile wastewater has been found to have adverse effects on human health, underscoring the need to remove these pollutants. In this study, methylene blue was used as a representative pollutant to assess the effectiveness of photocatalytic degradation using TiO2 P25 as a photocatalyst. The PHOTOREAC software, a user-friendly open-access computational tool developed in MATLAB specifically for modeling and simulating large-scale solar photocatalytic reactors in environmental applications, was employed to simulate both a kinetic model and a photon absorption scattering. The secondary data were classified based on several operating conditions, including the incident light source, light intensity, and photoreactor configurations, to investigate the impact of each condition. The results obtained from the PHOTOREAC simulation and secondary data analysis indicated that a solar simulator utilizing a xenon lamp as the incident light source is preferable for photocatalytic degradation due to its constant irradiation compared to natural solar light. Increasing the light intensity of the incident light source from 300 W/m2 to 1000 W/m2 also enhances the photocatalytic degradation performance. The optimum loading of the photocatalyst exhibits variation, ranging from 8 to 15 g/L. The efficiency of photocatalytic degradation is influenced by various properties of the photocatalyst, such as the crystal structure, surface area, crystallite size, and band gap energy. Furthermore, the Langmuir Hinshelwood and the Ballari models are the most suitable kinetic model expression for guiding photocatalytic degradation of methylene blue.

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Recent Results on Science and Innovation Related to Electrical Processes of Thunderstorms

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Surveys in Geophysics 2025年 1-69页

作者： Köhn, Christoph Neubert, Torsten Füllekrug, Martin Ebert, Ute Nijdam, Sander Chanrion, Olivier Østgaard, Nikolai Marisaldi, Martino Soula, Serge Montanyà, Joan Gordillo-Vázquez, Francisco Luque, Alejandro Teunissen, Jannis Holbøll, Joachim Bennett, Alec Smith, Paul Lorenzo, Victor Christian, Hugh J. Madsen, Søren F. Mihailova, Diana Boissin, Jean-François Pedeboy, Stéphane Chaumat, Laure Heumesser, Matthias Dimitriadou, Krystallia Maiorana, Carolina Ghilain, Simon Gomez Kuri, Zaida Peverell, Adam Urbani, Michele Kieu, Thi Ny Martinez, Andy Francisco, Hani Niknezhad, Mojtaba Teixeira-Gomes, Miguel B. Pizzuti, Andrea Arcanjo, Marcelo Mirpour, Shahriar Bai, Xue Reglero, Victor National Space Institute (DTU Space) Technical University of Denmark Kgs. Lyngby Denmark Centre for Space Atmospheric and Oceanic Science Department of Electronic and Electrical Engineering University of Bath Bath United Kingdom Multiscale Dynamics Group Centrum Wiskunde & Informatica (CWI) Amsterdam The Netherlands Department of Applied Physics Eindhoven University of Technology Eindhoven The Netherlands Birkeland Centre for Space Science University of Bergen Bergen Norway Laboratoire d’Aérologie University of Toulouse Toulouse France Electrical Engineering Department Polytechnic University of Catalonia Barcelona Spain Instituto Astrofísica de Andalusía CSIC Granada Spain DTU Elektro Technical University of Denmark Kgs. Lyngby Denmark Bristol Industrial and Research Associates Limited (Biral) Bristol United Kingdom Dena Desarrollos S.L. (Ingesco) Terrassa Spain Department of Atmospheric Science Earth System Science Center University of Alabama Huntsville USA Polytec Bramming Denmark Plasma Matters Eindhoven The Netherlands AIRBUS Blagnac France Météorage Pau France Thales Services SAS Toulouse France DTU Wind and Energy Systems Technical University of Denmark Roskilde Denmark Department of Physics Loyola University Chicago Chicago USA Image Processing Laboratory University of Valencia Valencia Spain

Lightning is a highly energetic electric discharge process in our atmosphere, evolving in several complex stages. Lightning is recognized as an essential climate variable, as it affects the concentration of greenhouse gases. It also threatens electrical and electronic devices, in particular, on elevated structures like wind turbines, and it endangers aircraft built with modern composite materials with inherently low electric conductivity. During the past decades, our fundamental understanding of atmospheric electricity has continued to evolve. For example, during the past 30 years, discharge processes were discovered in the atmosphere above thunderstorms, the so-called transient luminous events (TLEs) in the stratosphere and mesosphere, and terrestrial gamma-ray flashes (TGFs), accompanied with beams of photons, electrons and positrons, were observed from low orbiting satellites passing over thunderstorms. Lightning-like discharges also appear in plasma and high-voltage technology. The SAINT network was formed to bring the different research fields together. SAINT was the “Science And INnovation of Thunderstorms” Marie Skłodowska-Curie Innovative Training Network of the European Union Horizon 2020 program. From 2017 to 2021, 15 PhD students observed lightning processes from satellites and ground, developed models and conducted laboratory experiments. The project bridged between geophysical research, plasma technology and relevant industries. The paper presents a summary of the findings of the SAINT network collaboration.

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Synthesis of Mercapto Ethyl Ester of Palm Fatty Acid Distillate 24

Synthesis of Mercapto Ethyl Ester of Palm Fatty Acid Distill...

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24th Regional Symposium on Chemical Engineering, RSCE 2017

作者： Putrawan, I Dewa Gede Arsa Azharuddin, Adli Arum, Kartini Ratna Adityawarman, Dendy Rahim, Dicka Ar Research Group on Chemical Product Design and Development Institut Teknologi Bandung Jl. Ganesha 10 Bandung Indonesia Research Group on Chemical Process Design and Development Institut Teknologi Bandung Jl. Ganesha 10 Bandung Indonesia Research Group on Energy and Processing System Institut Teknologi Bandung Jl. Ganesha 10 Bandung Indonesia

This research is aimed to study the synthesis of mercapto ethyl ester of fatty acid (MEFA) using palm fatty acid distillate (PFAD). The synthesis was carried out in a jacketed stirred vessel. Water as a byproduct was removed by using vacuum evaporation. p-Toluene sulfonic acid was used as catalyst. Temperature, mercaptoethanol excess, and catalyst amount were varied during the experiments. The variations ranges were 60-80°C, 5-25 %-mole, and 0.8-3.2 %-mole, respectively. The accomplishment of reaction was evaluated by measuring the mercaptan content and yield of MEFA. The mercaptan content and yield of MEFA were in the ranges of 6.4-8.0% and 64-86%, respectively. It was found that mercaptan content and yield increased with temperature. The optimum temperature was found to be 70°C, considering the mercaptan content, yield, and appearance of the product obtained. A full 22 factorial design at a reaction temperature of 70°C showed that mercaptoethanol excess and catalyst amount had significant effects on the mercaptan content and yield of MEFA. © The Authors, published by EDP Sciences, 2018.

关键词： Fatty acids

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Effects of tangential inlet shape and orientation angle on the fluid dynamics characteristics in a biomass burner

Effects of tangential inlet shape and orientation angle on t...

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International Conference on Computation in Science and Engineering, ICCSE 2017

作者： Pasymi Budhi, Y.W. Bindar, Y. Energy and Processing System Research Group Study Programmes of Chemical Bioenergy and Chemurgy Engineerings Faculty of Industrial Technology Institut Teknologi Bandung Indonesia Department of Chemical Engineering Faculty of Industrial Technology Bung Hatta University Padang Indonesia

The perennial crops are potentially used as renewable fuels in the boiler furnace. Due to its specific characteristics, the burner design for this biomass needs to be properly developed. The burner design proposed here is a cylindrical burner having an axial inlet and a pair of tangential injection. This study is aimed to investigate the effect of tangential inlet geometry on the burner performance, through numerical evaluation of fluid dynamics characteristics. The numerical evaluations are conducted using k-ϵ turbulence model under Ansys-Fluent software. The simulation results showed that, at certain orientation angles of tangential inlet, there are back flows from furnace to the internal burner. This phenomenon is responsible to the flame stability in the burner. The turbulence intensity and convective heat transfer coefficient are also influenced by the tangential inlet orientation angle. For same cross sectional area, the rectangular tangential inlet shape generated deeper backflow penetration and higher turbulence intensity than that was done by the circular ones. One of the rectangular shape shortcomings to the circular ones is to produce the higher static pressure, which correlate to the higher burner operating cost. This investigation study concluded that the burner with rectangular tangential inlet shape and orientation angle of 200 potentially produces the best burner performance. © Published under licence by IOP Publishing Ltd.

关键词： Heat transfer coefficients

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Technology Roadmap for Flexible Sensors

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ACS NANO 2023年第6期17卷 5211-5295页

作者： Luo, Yifei Abidian, Mohammad Reza Ahn, Jong-Hyun Akinwande, Deji Andrews, Anne M. Antonietti, Markus Bao, Zhenan Berggren, Magnus Berkey, Christopher A. Bettinger, Christopher John Chen, Jun Chen, Peng Cheng, Wenlong Cheng, Xu Choi, Seon-Jin Chortos, Alex Dagdeviren, Canan Dauskardt, Reinhold H. Di, Chong-an Dickey, Michael D. Duan, Xiangfeng Facchetti, Antonio Fan, Zhiyong Fang, Yin Feng, Jianyou Feng, Xue Gao, Huajian Gao, Wei Gong, Xiwen Guo, Chuan Fei Guo, Xiaojun Hartel, Martin C. He, Zihan Ho, John S. Hu, Youfan Huang, Qiyao Huang, Yu Huo, Fengwei Hussain, Muhammad M. Javey, Ali Jeong, Unyong Jiang, Chen Jiang, Xingyu Kang, Jiheong Karnaushenko, Daniil Khademhosseini, Ali Kim, Dae-Hyeong Kim, Il-Doo Kireev, Dmitry Kong, Lingxuan Lee, Chengkuo Lee, Nae-Eung Lee, Pooi See Lee, Tae-Woo Li, Fengyu Li, Jinxing Liang, Cuiyuan Lim, Chwee Teck Lin, Yuanjing Lipomi, Darren J. Liu, Jia Liu, Kai Liu, Nan Liu, Ren Liu, Yuxin Liu, Yuxuan Liu, Zhiyuan Liu, Zhuangjian Loh, Xian Jun Lu, Nanshu Lv, Zhisheng Magdassi, Shlomo Malliaras, George G. Matsuhisa, Naoji Nathan, Arokia Niu, Simiao Pan, Jieming Pang, Changhyun Pei, Qibing Peng, Huisheng Qi, Dianpeng Ren, Huaying Rogers, John A. Rowe, Aaron Schmidt, Oliver G. Sekitani, Tsuyoshi Seo, Dae-Gyo Shen, Guozhen Sheng, Xing Shi, Qiongfeng Someya, Takao Song, Yanlin Stavrinidou, Eleni Su, Meng Sun, Xuemei Takei, Kuniharu Tao, Xiao-Ming Tee, Benjamin C. K. Thean, Aaron Voon-Yew Trung, Tran Quang Wan, Changjin Wang, Huiliang Wang, Joseph Wang, Ming Wang, Sihong Wang, Ting Wang, Zhong Lin Weiss, Paul S. Wen, Hanqi Xu, Sheng Xu, Tailin Yan, Hongping Yan, Xuzhou Yang, Hui Yang, Le Yang, Shuaijian Yin, Lan Yu, Cunjiang Yu, Guihua Yu, Jing Yu, Shu-Hong Yu, Xinge Zamburg, Evgeny Zhang, Haixia Zhang, Xiangyu Zhang, Xiaosheng Zhang, Xueji Zhang, Yihui Zhang, Yu Zhao, Siyuan Zhao, Xuanhe Zheng, Yuanjin Zheng, Yu-Qing Zheng, Zijian Zhou, Tao Zhu, Bowen Zhu, Ming Zhu, Rong Zhu, Yangzhi Zhu, Yong Zou, Guijin Chen, Xiaodong 08-03 Innovis Singapore 138634 Republic of Singapore Innovative Centre for Flexible Devices (iFLEX) School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore Department of Biomedical Engineering University of Houston Houston Texas 77024 United States School of Electrical and Electronic Engineering Yonsei University Seoul 03722 Republic of Korea Department of Electrical and Computer Engineering The University of Texas at Austin Austin Texas 78712 United States Microelectronics Research Center The University of Texas at Austin Austin Texas 78758 United States Department of Chemistry and Biochemistry California NanoSystems Institute and Department of Psychiatry and Biobehavioral Sciences Semel Institute for Neuroscience and Human Behavior and Hatos Center for Neuropharmacology University of California Los Angeles Los Angeles California 90095 United States Colloid Chemistry Department Max Planck Institute of Colloids and Interfaces 14476 Potsdam Germany Department of Chemical Engineering Stanford University Stanford California 94305 United States Laboratory of Organic Electronics Department of Science and Technology Campus Norrköping Linköping University 83 Linköping Sweden Wallenberg Initiative Materials Science for Sustainability (WISE) and Wallenberg Wood Science Center (WWSC) SE-100 44 Stockholm Sweden Department of Materials Science and Engineering Stanford University Stanford California 94301 United States Department of Biomedical Engineering and Department of Materials Science and Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213 United States Department of Bioengineering University of California Los Angeles Los Angeles California 90095 United States School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University Singapore 637457 Singapore Nanobionics Group Department of Chemical and Biological Engineering Monash University Clayton Australia 3800 Monash

Humans rely increasingly on sensors to address grand challenges and to improve quality of life in the era of digitalization and big data. For ubiquitous sensing, flexible sensors are developed to overcome the limitations of conventional rigid counterparts. Despite rapid advancement in bench-side research over the last decade, the market adoption of flexible sensors remains limited. To ease and to expedite their deployment, here, we identify bottlenecks hindering the maturation of flexible sensors and propose promising solutions. We first analyze continued...challenges in achieving satisfactory sensing performance for real-world applications and then summarize issues in compatible sensor-biology interfaces, followed by brief discussions on powering and connecting sensor networks. Issues en route to commercialization and for sustainable growth of the sector are also analyzed, highlighting environmental concerns and emphasizing nontechnical issues such as business, regulatory, and ethical considerations. Additionally, we look at future intelligent flexible sensors. In proposing a comprehensive roadmap, we hope to steer research efforts towards common goals and to guide coordinated development strategies from disparate communities. Through such collaborative

关键词： soft materials mechanics engineering flexible electronics conformable sensors bioelectronics human-machine interfaces body area sensor networks technology translation sustainable electronics

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Effects of tangential inlet shape and orientation angle on the fluid dynamics characteristics in a biomass burner

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Journal of Physics: Conference Series 2018年第1期1090卷

作者： Pasymi Y W Budhi Y Bindar Energy and Processing System Research Group Study Programmes of Chemical Bioenergy and Chemurgy Engineerings Faculty of Industrial Technology Institut Teknologi Bandung Indonesia Department of Chemical Engineering Faculty of Industrial Technology Bung Hatta University Padang Indonesia

The perennial crops are potentially used as renewable fuels in the boiler furnace. Due to its specific characteristics, the burner design for this biomass needs to be properly developed. The burner design proposed here is a cylindrical burner having an axial inlet and a pair of tangential injection. This study is aimed to investigate the effect of tangential inlet geometry on the burner performance, through numerical evaluation of fluid dynamics characteristics. The numerical evaluations are conducted using k-ε turbulence model under Ansys-Fluent software. The simulation results showed that, at certain orientation angles of tangential inlet, there are back flows from furnace to the internal burner. This phenomenon is responsible to the flame stability in the burner. The turbulence intensity and convective heat transfer coefficient are also influenced by the tangential inlet orientation angle. For same cross sectional area, the rectangular tangential inlet shape generated deeper backflow penetration and higher turbulence intensity than that was done by the circular ones. One of the rectangular shape shortcomings to the circular ones is to produce the higher static pressure, which correlate to the higher burner operating cost. This investigation study concluded that the burner with rectangular tangential inlet shape and orientation angle of 200 potentially produces the best burner performance.

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