Article
Energy & Fuels
Fatih Guelec, Will Meredith, Colin E. Snape
Summary: Oil refineries contribute up to 5% of global CO2 emissions, with a significant portion coming from the Fluid Catalytic Cracking (FCC) process. A study has investigated the combustion behavior of different types of cokes using oxygen carriers CuO, Co3O4, and Mn2O3. The results show that CuO is the most effective carrier at high temperatures and can achieve high combustion efficiency.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
Article
Thermodynamics
Fatih Gulec, Jude A. Okolie, Ahmet Erdogan
Summary: Oil refineries contribute 4-6% of global CO2 emissions, mainly due to the FCC unit's regenerator. Chemical looping combustion (CLC) is a promising CO2 capture process for FCC units, but its economic feasibility has not been studied. This research presents the first techno-economic feasibility analysis of a CLC-FCC unit, demonstrating lower energy penalties and capture costs compared to conventional CCS technologies.
Article
Energy & Fuels
Giovanny S. de Oliveira, Ciro E. S. Lobo, Carlos E. A. Padilha, Domingos F. S. Souza, Juan A. C. Ruiz
Summary: Brazil aims to reduce its CO2 emissions by utilizing glycerin in Chemical Looping Combustion (CLC). The study evaluates the feasibility of using glycerin in CLC and finds that the addition of ethanol improves combustion efficiency, while the addition of methanol reduces efficiency.
Article
Chemistry, Applied
Fatih Gulec, Ahmet Erdogan, Peter T. Clough, Edward Lester
Summary: Oil refineries are responsible for 4-6% of global CO2 emissions, with a significant portion coming from the regenerator of Fluid Catalytic Cracking units. Chemical looping combustion offers a potential solution to reduce CO2 emissions, but further experimental and modeling studies are needed to understand the hydrodynamics in the regenerator. The computational fluid dynamic study provides insights into the behavior of gas-solid two-phase flow in the regenerator, with the findings aligning well with conventional FCC regenerators.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Applied
M. T. Izquierdo, F. Garcia-Labiano, A. Abad, A. Cabello, P. Gayan, L. F. de Diego, J. Adanez
Summary: This study evaluated the stability of a CuO/Al2O3 impregnated oxygen carrier during methane chemical looping combustion at high oxygen carrier to fuel ratios. The research found that low oxygen carrier conversion variation reduced copper loss from particles, but reoxidizing the oxygen carrier at high temperatures was difficult due to the formation of CuAlO2. Operating at temperatures around 800 degrees C with low solid conversion variation is recommended to limit copper loss while maintaining physical stability.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Engineering, Environmental
A. Cabello, A. Abad, T. Mendiara, M. T. Izquierdo, L. F. de Diego
Summary: Chemical looping combustion (CLC) allows for the simultaneous combustion of a fuel and the capture of CO2. In this study, tests were conducted in a lab-scale CLC unit using a promising Cu-based oxygen carrier to determine its combustion performance and durability. Operating conditions were carefully selected to maximize the oxygen carrier's durability while achieving complete CH4 combustion. The results showed that the Cu-based oxygen carrier exhibited excellent mechanical resistance, making it suitable for continuous CLC operation at 900 degrees C.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Doki Yamaguchi, Liangguang Tang, Jose Orellana, Trevor D. Hadley, Sankar Bhattacharya, Kok-Seng Lim
Summary: The study developed a compact fully looped chemical looping reactor and found that the CLC performance increased with increasing operation time over 36 hours, as indicated by the increase in the CO2/CO molar ratio. The morphology changes and ash interaction of the Australian ilmenite did not noticeably affect the CLC performance or operation during continuous operation.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Energy & Fuels
Richard A. Newby, Dale L. Keairns, Robert W. Stevens
Summary: The objective of this study was to estimate the cost of commercial production of oxygen carriers (OCs) for large-scale application in the chemical looping combustion (CLC) power generation industry. Two production facility scenarios were considered, and two OC production techniques were addressed. The estimated OC product costs can be used to guide development and determine the maximum OC makeup rate for achieving a designated cost-of-electricity (COE) reduction goal.
Review
Energy & Fuels
Guicai Liu, Grzegorz Lisak
Summary: This review summarizes the basic properties and opportunities of Cu-based OCs in various chemical looping processes. It covers the applications of Cu-based OCs in chemical looping combustion (CLC), chemical looping oxygen uncoupling (CLOU), chemical looping air separation (CLAS), chemical looping for syngas/H2 production, integrated CaO/CuO looping process, and thermochemical energy storage (TCES). The review also discusses the technical challenges and current strategies related to agglomeration, attrition, and ash accumulation. It provides insights and guidance for the design and development of Cu-based OCs and their applications in chemical looping processes.
Review
Environmental Sciences
W. Akram, Sanjay, M. A. Hassan
Summary: This paper discusses the application of oxygen carriers in chemical looping combustion and the impact of particle size, highlighting the potential use of nanosized oxygen carriers. It demonstrates that as particle size decreases from micro- to nanoscale, the reactivity of oxygen carriers increases.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Energy & Fuels
Pietro Bartocci, Alberto Abad, Arturo Cabello Flores, Margarita de las Obras Loscertales
Summary: To address the scale-up challenges of Chemical Looping Processes, the development of efficient and affordable oxygen carriers is crucial. Ilmenite, an ore-derived oxygen carrier, has been identified as an abundant and low-cost option. This paper provides insights into its preparation, reactivity, and performance compared to other carriers, along with its thermodynamic properties and kinetics. The paper also explores its compatibility with various fuels (solid, liquid, gaseous, including biofuels) and discusses important considerations such as cost, environmental sustainability, oxygen transport capacity, as well as issues related to fluidized bed reactors, such as agglomeration and attrition behavior. Furthermore, the paper investigates the interaction between ilmenite and fuels, including the impact of impurities and coke deposition on the gasification rate of solid fuels.
Article
Engineering, Environmental
Amr Abdalla, Mansour Mohammedramadan Tijani, Mohanned Mohamedali, Nader Mahinpey
Summary: This study investigated the effects of introducing WO3 into NiO/ZrO2 oxygen carriers for methane CLC, and found that the dual metal oxide oxygen carriers exhibited enhanced oxygen capacity and lower carbon formation compared to their monometallic counterparts. The introduction of WO3 into the NiO/ZrO2 lattice structure led to the formation of an intermediate phase (NiWO4) which improved oxygen carriers' reducibility and metal dispersion. Impregnation synthesis method showed superior performance in terms of cyclic stability and coking resistance.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Review
Energy & Fuels
Dunyu Liu, Chaoran Wang, Yunpei Fan, Qiuqi Liu, Xudong Wang, Kailong Xu, Jing Jin, Jingjing Ma, Jinchen Ma
Summary: Chemical looping combustion (CLC) of coal for carbon capture utilization and storage is an effective technology to reduce carbon emission. However, there is uncertainty in mercury emission from both air and fuel reactor. This paper aims to reveal the mechanisms for the transformation of mercury-related species.
Article
Engineering, Chemical
Dawei Wang, Anuj Joshi, Liang-Shih Fan
Summary: Chemical looping is a process that uses chemical intermediates to decompose a reaction into multiple sub-reaction steps. Calcium looping and redox looping are two applications of chemical looping, with the former being commercially demonstrated and the latter yet to be realized sustainably. With increasing concerns about climate change, efforts to develop redox looping as a promising fossil energy conversion technology with CO2 emission control have been invigorated. Metal oxide reaction engineering and particle science and technology are crucial technical areas to advance the industrial practice of chemical looping.
Review
Environmental Sciences
Siddig Abuelgasim, Wenju Wang, Atif Abdalazeez
Summary: Chemical looping combustion (CLC) is a promising CO2 capture technology that utilizes metal particles to transport oxygen and avoid nitrogen in combustion exhaust. Oxygen carrier is a key parameter in CLC, and tests have shown its feasibility worldwide.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Chemical
Fatih Gulec, Emir Huseyin Simsek, Hilal Taniker Sari
Summary: A novel method called Kalman filter was investigated to predict the pyrolysis mechanisms of four different biomasses and compared with regression analysis. The models with reversible reactions in addition to parallel pyrolysis steps showed a better fit with the experimental results. The pyrolysis step from biomass to bio-oil exhibited the highest reaction rates compared to other defined pyrolysis steps in the models. Kalman filter is considered a promising method for estimating detailed pyrolysis mechanisms and model parameters with minimum experimental data.
CHEMICAL ENGINEERING & TECHNOLOGY
(2022)
Review
Construction & Building Technology
A. Weir, A. Jimenez del Barco Carrion, C. Queffelec, B. Bujoli, E. Chailleux, C. N. Uguna, C. Snape, G. Airey
Summary: Biobinders are gaining popularity in asphalt engineering due to environmental concerns and depleting petroleum bitumen reserves. This review explores the link between biomass thermochemical conversion technologies and biobinders in pavement engineering, highlighting the importance of biomass source and production technology on biobinders' performance.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Energy & Fuels
Fatih Gulec, Direnc Pekaslan, Orla Williams, Edward Lester
Summary: This study applies artificial neural network (ANN) models to predict the higher heating value (HHV) of biomass feedstocks and comprehensively analyzes the factors that affect the prediction, including activation functions, algorithms, hidden layers, dataset, and randomization. The results show that using ANN models trained by the combination of ultimate-proximate analyses (UAPA) datasets, with sigmoidal activation functions (tansig and logsig), and with Levenberg-Marquardt (lm) or Bayesian Regularization (br) algorithms as training activation functions, can provide accurate HHV prediction.
Article
Thermodynamics
Fatih Gulec, Orla Williams, Emily T. Kostas, Abby Samson, Edward Lester
Summary: This study compares the effects of three different thermal conversion technologies on different biomass feedstocks and explores their potential bioenergy applications. The results indicate that hydrothermal conversion is suitable for char production from Whitewood and Rapeseed, while Seaweed Laminaria digitata is not suitable for bioenergy applications due to its high ash content and low higher heating value.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Meshach E. Tabat, Fredrick O. Omoarukhe, Fatih Gulec, Dare E. Adeniyi, Alivia Mukherjee, Patrick U. Okoye, Chukwuma C. Ogbaga, Emmanuel I. Epelle, Olugbenga Akande, Jude A. Okolie
Summary: The present study proposes a conceptual mobile autothermal methane pyrolysis unit for onsite hydrogen production. The design combines a catalytic plasma methane pyrolysis unit with a steam char gasification setup, combustion, and biomethanation unit for hydrogen production. Energy and exergy calculations followed by a comprehensive economic analysis were used to evaluate the efficiency and performance of the integrated process. The proposed design showed a positive net present value and lower levelized cost of hydrogen, indicating its profitability.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Review
Environmental Sciences
Jude A. Okolie, Toheeb Jimoh, Olugbenga Akande, Patrick U. Okoye, Chukwuma C. Ogbaga, Adekunle A. Adeleke, Peter P. Ikubanni, Fatih Gulec, Andrew Nosakhare Amenaghawon
Summary: Human and animal waste pose a threat to the environment and human health when improperly disposed. This study explores different methods for converting waste into valuable resources and discusses the properties of waste and strategies for nutrient recovery. The research also highlights the leading countries and institutions in this field and suggests future directions for research, including on-site resource recovery technologies and safe waste processing methods.
Review
Biotechnology & Applied Microbiology
Fatih Gulec, Anburajan Parthiban, Great C. Umenweke, Umaru Musa, Orla Williams, Yasna Mortezaei, Hyun Suk-Oh, Edward Lester, Chukwuma C. Ogbaga, Burcu Gunes, Jude A. Okolie
Summary: This article discusses the thermochemical methods and trends in biomass utilization for sustainable energy production, and introduces the challenges and prospects of various conversion technologies. Additionally, the article explores biomass thermochemical conversion processes combined with carbon capture to achieve negative net atmospheric carbon emissions.
BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR
(2023)
Article
Agricultural Engineering
Andrew James Welfle, Alberto Almena, Muhammad Naveed Arshad, Scott William Banks, Isabela Butnar, Katie Jane Chong, SamuelJ. G. Cooper, Helen Daly, Samira Garcia Freites, Fatih Gulec, Christopher Hardacre, Robert Holland, Lan Lan, Chai Siah Lee, Peter Robertson, Rebecca Rowe, Anita Shepherd, Nathan Skillen, Silvia Tedesco, Patricia Thornley, Pedro Verdia Barbara, Ian Watson, Orla Sioned Aine Williams, Mirjam Roder
Summary: This research applies the Bioeconomy Sustainability Indicator Model (BSIM) to analyze the performance of bioenergy across 126 sustainability issues. It finds common trends and identifies potential benefits and risks associated with bioenergy projects. The research suggests that a broader approach to assessing sustainability, considering a range of indicators and not just emissions, may be more effective.
BIOMASS & BIOENERGY
(2023)
Review
Chemistry, Multidisciplinary
Fatih Gulec, Jude A. Okolie
Summary: Biomass valorisation for bioenergy is crucial for establishing a sustainable low-carbon circular bioeconomy and addressing societal and environmental challenges. Chemical looping combustion and gasification have potential in biomass utilization for bioenergy generation and carbon emissions mitigation.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Green & Sustainable Science & Technology
Arnold E. Sison, Sydney A. Etchieson, Fatih Gulec, Emmanuel I. Epelle, Jude A. Okolie
Summary: Chemical looping gasification (CLG) is an advanced thermochemical process that utilizes solid metal oxides as oxidants to transfer oxygen from an air reactor to a gasification reactor, resulting in the production of hydrogen gas with a smaller carbon footprint compared to conventional gasification. However, CLG still faces challenges such as high capital cost, durability of oxygen carriers, complex reaction mechanism, and scalability issues. This study proposes a novel approach combining process simulation, experimental studies, and machine learning analysis to predict hydrogen and char yield during CLG, with gradient boost regression (GBR) outperforming other models.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Thermodynamics
Fatih Gulec, Jude A. Okolie, Ahmet Erdogan
Summary: Oil refineries contribute 4-6% of global CO2 emissions, mainly due to the FCC unit's regenerator. Chemical looping combustion (CLC) is a promising CO2 capture process for FCC units, but its economic feasibility has not been studied. This research presents the first techno-economic feasibility analysis of a CLC-FCC unit, demonstrating lower energy penalties and capture costs compared to conventional CCS technologies.
Article
Energy & Fuels
Fatih Gulec, Jude A. Okolie, Peter T. Clough, Ahmet Erdogan, Will Meredith, Colin E. Snape
Summary: Chemical looping combustion is an advanced combustion process that uses metal oxides as oxygen carriers for fuel combustion and re-oxidizes reduced metal oxides in an air reactor. This research comprehensively studied the low-temperature oxidation of hydrogen using CuO, Co3O4, and Mn2O3 as oxygen carriers, and proposed potential reduction stages for safe hydrogen combustion for space heating.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
Article
Energy & Fuels
Fatih Guelec, Will Meredith, Colin E. Snape
Summary: Oil refineries contribute up to 5% of global CO2 emissions, with a significant portion coming from the Fluid Catalytic Cracking (FCC) process. A study has investigated the combustion behavior of different types of cokes using oxygen carriers CuO, Co3O4, and Mn2O3. The results show that CuO is the most effective carrier at high temperatures and can achieve high combustion efficiency.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
Article
Green & Sustainable Science & Technology
Inioluwa Christianah Afolabi, Emmanuel Epelle, Burcu Gunes, Fatih Gulec, Jude A. Okolie
Summary: Higher heating values (HHV) is an important parameter for assessing biomass-driven energy systems, traditionally measured experimentally but time-consuming and expensive. This study developed and verified three reliable machine learning models (ANN, DT, and RF) using different biomass datasets, with RF model showing the highest accuracy in HHV prediction.
CLEAN TECHNOLOGIES
(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.