Article
Green & Sustainable Science & Technology
Fangjun Wang, Wei Zhou, Shiyi Chen, Lunbo Duan, Wenguo Xiang
Summary: This study investigates the performance of the calcium looping process for biomass hydrogen-rich gasification and carbon dioxide capture. It shows that dolomite as bed material has a more significant improvement in hydrogen production compared to quartz sand. Furthermore, a higher temperature in the riser benefits tar conversion, and an increase in solid circulating flux improves hydrogen concentration and yield while reducing tar content.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Edoardo De Lena, Borja Arias, Matteo C. Romano, J. Carlos Abanades
Summary: This study investigates a Calcium Looping (CaL) configuration for cement plants using two interconnected circulating fluidized bed (CFB) reactors. The proposed system combines calcination and fragmentation of limestone in a single unit, taking advantage of the limestone's tendency to attrition. The economic analysis shows that this configuration is competitive.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2022)
Article
Green & Sustainable Science & Technology
Giuseppe Cristian Piso, Piero Bareschino, Paola Brachi, Claudio Tregambi, Giovanna Ruoppolo, Francesco Pepe, Erasmo Mancusi
Summary: In this study, the Chemical Looping Reforming of biogas was proposed and numerically investigated to achieve the clean, efficient, and cost-effective utilization of renewable carbonaceous fuels. The effects of biogas composition and process parameters on the reaction performances were assessed and discussed, including the conversion degree, syngas yield, and syngas composition.
Article
Energy & Fuels
Joseba Moreno, Sally L. Homsy, Max Schmid, Gunter Scheffknecht
Summary: This study investigated the multicyclic behavior of limestone in a 20 kWth CaL facility and analyzed the performance of the carbonator under various process variables. The carbonator design achieved high CO2 capture efficiencies and apparent carbonation rates within the investigated operating conditions. The proposed design could potentially be integrated into existing load-following power plants for more flexible usage of CaL systems.
Article
Energy & Fuels
Wan Zhang, Yingjie Li, Shoubing Chai, Zirui He, Chunxiao Zhang, Dong Wang
Summary: In this study, Mn-doped CaO was found to significantly improve the efficiency of CO for NO removal and CO2 capture in the calcium looping process. The presence of Mn enhanced the catalytic effect of CaO, leading to higher NO removal efficiency and CO2 capture capacity. The results suggest that Mn-doped CaO could be a promising material for achieving simultaneous NO removal and CO2 capture in the carbonation stage of the process.
Article
Thermodynamics
Junjie Lin, Liyan Sun, Kun Luo, Dali Kong, Jianren Fan
Summary: In this study, three-dimensional simulations were used to investigate the flow behavior and reaction characteristics of a chemical looping combustion system. The numerical models developed in this work can be utilized for system design and scale-up, and the operating temperature and solid inventory have significant effects on system performance.
Article
Engineering, Environmental
Fardin Sattari, Maryam Tahmasebpoor, Jose Manuel Valverde, Carlos Ortiz, Mousa Mohammadpourfard
Summary: The manuscript presents a general model for a fluidized bed carbonator reactor based on bed hydrodynamics, kinetics, and sorbent properties in the Calcium Looping (CaL) process. The study identifies key operational and hydrodynamic factors affecting CO2 capture efficiency, and highlights important model parameters. The model predictions are in agreement with experimental results and may be relevant for optimizing CaL operation conditions in power plants.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Long Han, Yuelun Wu, Nai Rong, Kaili Ma, Pingjiang Wu, Zhifu Qi, Haoran Ding, Jianglin Zhao, Changjian Xin
Summary: In this study, cement-modified carbide slag was developed as a low-cost CaO sorbent, prepared by an economical method of wet mixing. The modified carbide slag showed enhanced sintering resistance and mechanical strength, leading to higher CO2 absorption capacity compared to natural carbide slag. Moreover, the modified carbide slag exhibited better gasification performance for H-2 production.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Chemistry, Multidisciplinary
Stefan H. A. M. Leenders, Galina Pankratova, John Wijenberg, Julija Romanuka, Farahnaz Gharavi, Joana Tsou, Melina Infantino, Lennart van Haandel, Sander van Paasen, Paul-Emmanuel Just
Summary: An alternative method for determining degradation rates of adsorbents in post-combustion CO2 capture has been developed and validated. The study found that the degradation rates in the desorber were three times higher than in the adsorber. Laboratory degradation experiments can be used to optimize process operations or screen for new adsorbents.
Article
Energy & Fuels
Xiaoli Zhu, Zhenbo Wang, Raffaella Ocone, Haigang Wang
Summary: This study numerically investigated the gasification of biomass with CO2 in a pilot plant circulating fluidized bed gasifier. The results showed that the CO2 percentage in the gasifying agent had insignificant influence on gas-solid distribution, but directly affected the char conversion and product gas compositions. The optimal CO2 percentage was found to be 60 wt%, resulting in the best thermochemical performance of the gasifier.
Article
Engineering, Chemical
Robert T. Symonds, Dennis Y. Lu, Arturo Macchi, Robin W. Hughes, Edward J. Anthony
Summary: Calcium looping is a feasible CO2 capture technology, but chlorine in fuels can impact the performance of calcium-based sorbents. Experimental results showed that the presence of HCl can increase sorbent reactivity towards CO2 and decrease CO2 diffusional resistance by changing particle morphology during carbonation using Canadian limestone. Additionally, full sorbent dechlorination can be achieved under typical oxy-fuel calcination conditions, with over 99% HCl capture without affecting sorbent CO2 capture performance when steam is present during both carbonation and calcination.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Energy & Fuels
Selina Hafner, Max Schmid, Gunter Scheffknecht
Summary: Sorption-enhanced gasification (SEG) is a biomass-based process that can produce syngas, serving as an alternative to fossil fuels to reduce greenhouse gas emissions. By controlling gasification temperature, steam to carbon ratio, and weight hourly space velocity in experiments, the properties of syngas can be adjusted for specific downstream synthesis processes.
Article
Environmental Sciences
Flavio Lopes Francisco Bittencourt, Marcio Ferreira Martins, Marcos Tadeu D. Orlando
Summary: Sanitation equity and climate actions are global concerns addressed by the United Nations in the Sustainable Development Goals. Human waste contributes significantly to greenhouse gas emissions, whether through wastewater treatment plants in developing countries or anaerobic digestion in pit latrines in underdeveloped regions. This study introduces the FeD-Latrine, a thermally sustainable device that utilizes smoldering combustion to eliminate fresh human feces while implementing a process for CO2 reduction and capture. Through gas looping and the use of a sorbent, CO2 emissions are decreased by 60% compared to typical pit latrines.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Green & Sustainable Science & Technology
Ningbo Gao, Maciej Sliz, Cui Quan, Artur Bieniek, Aneta Magdziarz
Summary: The study found that a 2:1 ratio of N-2 to CO2 at 700 degrees Celsius resulted in a 25% reduction in CO2. The catalytic properties of CaO increased the concentration of H-2 in the produced syngas by up to 10%. However, a temperature of 800 degrees Celsius was too high for the carbonation reaction of CaO.
Article
Thermodynamics
Magdalena Strojny, Pawel Gladysz, Dawid P. Hanak, Wojciech Nowak
Summary: Achieving net zero emissions is a crucial challenge in global climate change policy, which requires reducing fossil fuel use, deploying renewable energy sources, and developing carbon capture technologies. This study compared two CO2 capture retrofits for natural gas combined cycle (NGCC), and found that amine absorption is a mature and commercial technology, while calcium looping is a promising method still in pilot studies. The research also evaluated the energy efficiency penalties and economic profitability of both concepts, as well as the potential for climate change mitigation.
Article
Materials Science, Multidisciplinary
Hanka Becker, Beate Fankhanel, Claudia Voigt, Alexandros Charitos, Michael Stelter, Christos G. Aneziris, Andreas Leineweber
Summary: Fe is a detrimental impurity element in secondary Al-Si cast alloys. Using filters to increase Fe-removal efficiency can contribute to production of high-quality alloys. Different filter materials' interactions with the alloys were evaluated in experiments.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Beate Fankhaenel, Jana Hubalkova, Christos G. Aneziris, Michael Stelter, Alexandros Charitos
Summary: This study investigates the influence of different filter materials on hydrogen porosity in castings made of an AlCu4Ti alloy, revealing that spodumene can both promote the formation of gaseous hydrogen and contribute to a reduction in porosity.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Amelia Schmidt, Victor Montenegro, Markus Reuter, Alexandros Charitos, Michael Stelter, Andreas Richter
Summary: This study investigates the physical behavior of flue dust in an industrial-scale Waste Heat Boiler (WHB) using a three-dimensional CFD model, predicting size-dependent particle sedimentation and risk areas for dust accretions. A new sticking function for flue dust is developed to evaluate accretion risk zones, with results validated against dust samples. Operational recommendations for minimizing dust accretions are derived.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Chemistry, Physical
Johannes Hopf, Aaron Weigelt, Hartmut Bombach, Michael Stelter, Alexandros Charitos
Summary: The state-of-the-art technology Moebius-electrolysis for raw silver refining has drawbacks from both technological and ecological perspectives. The increasing concentrations of critical impurities in raw silver, such as palladium, pose challenges for future refining processes. Methanesulfonic acid (MSA) shows promise as a base chemical for a more environmentally friendly and efficient refining method, with leaching experiments showing high silver leaching yields at elevated temperatures and solid concentrations.
Article
Crystallography
O. Paetzold, K. Dadzis, C. Kirmse, D. Weik, L. Buettner, J. Czarske, A. Charitos
Summary: The melt flow is crucial for Cz growth of silicon crystals, and in-situ measurement data are important for process development. This study presents new low-temperature model experiments and numerical simulations to investigate Cz type melt flow. A novel experimental setup with advanced measurement techniques is used to obtain accurate data for validation. The study reveals the occurrence of flow transitions between symmetric and non-symmetric structures under certain conditions.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Engineering, Mechanical
Florian Buerkle, Maik Foerste, Kaspars Dadzis, Iason Tsiapkinis, Olf Paetzold, Alexandros Charitos, Michael Dues, Juergen Czarske, Lars Buettner
Summary: Crystal growth process is a crucial step in the fabrication of modern semiconductor materials and devices. Researchers used optical measurement methods to study the gas flow behavior inside a crystal growth furnace, providing reference data for improving the crystal growth process.
FLOW MEASUREMENT AND INSTRUMENTATION
(2022)
Article
Materials Science, Multidisciplinary
Amelia Schmidt, Victor Montenegro, Markus Reuter, Alexandros Charitos, Michael Stelter, Andreas Richter
Summary: This study investigates the influence of three different baffle plate designs on accretion formation using a Computational Fluid Dynamics (CFD) model. Differences were found in the sedimentation and accretion of dust particles for all baffle plate modifications, leading to design recommendations.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Engineering, Chemical
Ludwig W. Blenau, Daniel Vogt, Oliver Lonski, Abuzar Abrar, Olga Fabrichnaya, Alexandros Charitos
Summary: Nd, Pr, and Dy are critical raw materials for rare earth permanent magnets, which are essential components in electric vehicles and wind turbine generators. Currently, China is the main producer of rare earth elements, with no established recycling industry for rare earth permanent magnets. A two-step process is proposed to separate iron-depleted slag phase and molten iron phase from the FeOx-CaO-Al2O3-REE2O3 molten slag. The slag has high concentrations of REE and can be used as a selective collector phase. The downstream hydrometallurgical processing of the slag shows promising results for the recovery of REE2O3, CaO, and Al2O3.
Article
Chemistry, Medicinal
Anita Kubiak, Martyna Pajewska-Szmyt, Martyna Kotula, Bartosz Lesniewski, Alona Voronkina, Parvaneh Rahimi, Sedigheh Falahi, Korbinian Heimler, Anika Rogoll, Carla Vogt, Alexander Ereskovsky, Paul Simon, Enrico Langer, Armin Springer, Maik Foerste, Alexandros Charitos, Yvonne Joseph, Teofil Jesionowski, Hermann Ehrlich
Summary: This study presents a new biomimetic approach for the development of a lepidocrocite-containing 3D spongin scaffold using artificial seawater and iron. The research proposes a mechanism of lepidocrocite formation and suggests the potential application of the biocomposite as an electrochemical dopamine sensor.
Article
Environmental Sciences
David Figueira-Galan, Stephanie Heupel, Glykeria Duelli, Marco Tomasi Morgano, Dieter Stapf, Natalia Requena
Summary: Arbuscular mycorrhizal (AM) fungi play a significant role in plant phosphate nutrition. However, their benefits are limited in highly fertilized soils. Biochars, on the other hand, can improve soil properties and act as a nutrient source for plants. This study found that the effectiveness of the combined application of biochars and AM fungi in promoting plant phosphate nutrition and growth depends on the origin of the biochar.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Materials Science, Multidisciplinary
Avinash Kandalam, Markus A. Reuter, Michael Stelter, Markus Reinmoeller, Martin Graebner, Andreas Richter, Alexandros Charitos
Summary: Part I of this series of papers focuses on the plant and reactor engineering aspects of TSL reactor technology. It provides a comprehensive overview of the technical advantages, reactor structure, and specific components, with a special focus on the reactor lance and associated developments.
Review
Materials Science, Multidisciplinary
Avinash Kandalam, Markus A. Reuter, Michael Stelter, Markus Reinmoller, Martin Graebner, Andreas Richter, Alexandros Charitos
Summary: This review paper analyzes the application of TSL bath smelter in various non-ferrous metal production processes and waste treatment. It discusses the reaction mechanisms, thermodynamics, slag chemistry, and process flowsheets. The paper provides a concise overview of the chemistry, thermodynamics, and process details, as well as the simulation and digitization efforts related to TSL technology. It offers valuable insights for both scholarly researchers and industry professionals.
Article
Green & Sustainable Science & Technology
Ludwig W. Blenau, Stephan A. H. Sander, Sindy Fuhrmann, Alexandros Charitos
Summary: A valorization process is proposed for fayalitic copper slags, where a primary copper slag is reduced via carbothermic reduction to create a pig iron phase and a secondary copper slag, which can be used for glass fiber production. The carbothermic reduction is carried out using graphite pellets or carbon fibers as alternative reduction agents in crucibles within an inductive heating furnace. The experiments are prepared and evaluated using FactSage 8.1, with carbon used in excess of 10% of the calculated value. The study investigates the effect of temperature variation and turbulence on the carbothermic reduction process, and manual glass fiber drawing is performed after remelting the secondary copper slag. The successful production of glass fibers requires a FeOx content below 10 wt%. The resulting pig iron phase and glass fibers are characterized, and their industrial applicability is discussed.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Multidisciplinary
Anita Kubiak, Alona Voronkina, Martyna Pajewska-Szmyt, Martyna Kotula, Bartosz Lesniewski, Alexander Ereskovsky, Korbinian Heimler, Anika Rogoll, Carla Vogt, Parvaneh Rahimi, Sedigheh Falahi, Roberta Galli, Enrico Langer, Maik Foerste, Alexandros Charitos, Yvonne Joseph, Hermann Ehrlich, Teofil Jesionowski
Summary: In this study, spongin from Hippospongia communis was used as a template to develop a new 3D composite containing goethite. The obtained composite showed potential industrial applications and exhibited satisfactory performance in the electrochemical sensing of dopamine in human urine samples.
Proceedings Paper
Green & Sustainable Science & Technology
Avinash Kandalam, Michael Stelter, Markus Reinmoller, Markus A. Reuter, Alexandros Charitos
Summary: Top submerged lance (TSL) smelters are widely used in non-ferrous metallurgy. The technology allows extraction of various materials and can be operated under different conditions. Bubble dynamics play a crucial role in reaction kinetics and equipment wear.
REWAS 2022: DEVELOPING TOMORROW'S TECHNICAL CYCLES, VOL I
(2022)
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.