Browsing USN Open Archive by Author "Moldestad, Britt Margrethe Emilie"
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Air gasification of wood chips, wood pellets and grass pellets in a bubbling fluidized bed reactor
Bandara, Janitha C.; Jaiswal, Rajan; Nielsen, Henrik K.; Moldestad, Britt Margrethe Emilie; Eikeland, Marianne S. (Peer reviewed; Journal article, 2021)Gasification is an attractive method for biomass-to-energy conversion and fluidized bed design is one of the best options for large scale operation. A bubbling fluidized bed reactor was used to analyze the effects of biomass ... -
Analysing the effect of temperature for steam fluidized-bed gasification of biomass with MP-PIC simulation
Bandara, Janitha; Moldestad, Britt Margrethe Emilie; Eikeland, Marianne Sørflaten (Journal article; Peer reviewed, 2018)Gasification in fluidized beds is an outstanding technology in biomass to energy conversion. The multiphase particle-in-cell modelling has reduced the computational time related to CFD simulations of dense gas-solid systems ... -
Analysis and Effect of Simulation parameters of CPFD Simulation in Fluidized Beds
Bandara, Janitha; Nielsen, Henrik Kofoed; Moldestad, Britt Margrethe Emilie; Eikeland, Marianne Sørflaten (Journal article; Peer reviewed, 2018)Fluidized bed technology is broadly applied in industry due to its distinct advantages. CFD simulation of fluidized beds is still challenging compared to single-phase systems and needs extensive validation. Multiphase ... -
Analysis of the effect of steam-to-biomass ratio in fluidized bed gasification with multiphase particle-in-cell CFD Simulation
Bandara, Janitha; Eikeland, Marianne Sørflaten; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2017)Biomass has been identified as a key renewable energy source to cope with upcoming environmental challenges. Gasification of biomass is becoming interested in large scale operation, especially in synthesis of liquid fuels. ... -
Analyzing the Effects of Geometrical and Particle Size Uncertainty in Circulating Fluidized Beds using CPFD Simulation
Bandara, Janitha; Moldestad, Britt Margrethe Emilie; Eikeland, Marianne Sørflaten (Journal article; Peer reviewed, 2019)Computational fluid dynamic modeling and simulation is becoming a useful tool in the detailed analysis of multiphase flow systems. The level of uncertainty is different depending on selected modeling concept and numerical ... -
Analyzing the effects of particle density, size, size distribution and shape for minimum fluidization velocity with Eulerian-Lagrangian CFD simulation
Bandara, Janitha; Eikeland, Marianne Sørflaten; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2017)Fluidized bed reactor systems are widely used due to excellent heat and mass transfer characteristics followed by uniform temperature distribution throughout the reactor volume. The importance of fluidized beds is further ... -
Application of Autonomous Inflow Control Valve for Enhanced Bitumen Recovery by Steam Assisted Gravity Drainage
Hosnaroudi, Soheila Taghavi; Farsi Madan, Farzan; Timsina, Ramesh; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2022)Steam assisted gravity drainage is a thermal method for enhanced bitumen recovery. In this method, steam is injected to bitumen and heavy oil to reduce the viscosity and make the oil mobile. However, early breakthrough of ... -
Assessment of Combustion and Gasification Behavior in a Bubbling Fluidized Bed Reactor: A Comparison between Biomass with and without Chemical Additives
Agu, Cornelius Emeka; Moldestad, Britt Margrethe Emilie; Pfeifer, Christoph (Peer reviewed; Journal article, 2020)During the storage of biogenic materials for energy utilization, destructions by microbial attacks are inevitable. Besides material degradation, self-ignition of wood chip piles also occurs consistently. Treating the ... -
Behaviour of biomass particles in a bubbling fluidized bed: A comparison between wood pellets and wood chips
Agu, Cornelius Emeka; Tokheim, Lars-André; Pfeifer, Christoph; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2019)For successful operation and design of a bubbling fluidized bed reactor handling a specific biomass, in-depth knowledge about the bed behaviour is paramount. This study compares the behaviour of a bed of sand containing ... -
Characterization of biomass wood
Haugen, Hildegunn H.; Furuvik, Nora Cecilie Ivarsdatter; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2016)Biomass is a renewable energy resource and can replace the use of fossil fuels, such as coal. Overgrown forests and fields are about to become a noticeable problem, because the rate of woodcutting is too low compared with ... -
Circulating fluidized bed reactors – part 01: analyzing the effect of particle modelling parameters in computational particle fluid dynamic (CPFD) simulation with experimental validation
Bandara, Janitha; Thapa, Rajan Kumar; Nielsen, Henrik Kofoed; Moldestad, Britt Margrethe Emilie; Eikeland, Marianne Sørflaten (Peer reviewed; Journal article, 2019)A CPFD hydrodynamic model was developed for a circulating fluidized bed system and the simulation results were validated against experimental data based on particle circulation rate. Sensitivity of the computational mesh ... -
Comparison of experimental and computational study of the fluid dynamics in fluidized beds with agglomerates
Furuvik, Nora Cecilie Ivarsdatter; Jaiswal, Rajan; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2020)Particle agglomeration is one of the obstacles for successful application and commercial breakthrough of fluidized bed biomass gasification. The problem is generally associated with molten ash components that interact with ... -
Computational modeling of fluidized bed behavior with agglomerates
Jakobsen, Krister; Jaiswal, Rajan; Furuvik, Nora Cecilie Ivarsdatter; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2020)Fluidized bed reactors can be used for biomass gasification. The product from biomass gasification is syngas, which can be used for production of bio oil. The main challenge when using fluidized bed for gasification is ash ... -
Computational modeling of fluidized bed behavior with agglomerates.
Jakobsen, Krister (Master thesis, 2020)The transition towards the use of more renewable energy is an essential subject for the imminent climate crisis. Biomass can be converted into syngas in a gasification process. The formation of agglomerates in a Bubbling ... -
Computational particle fluid dynamics simulation of biomass gasification in an entrained flow gasifier
Timsina, Ramesh; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie; Eikeland, Marianne Sørflaten (Journal article; Peer reviewed, 2021)Entrained flow gasification is an established technology for coal and petroleum coke particles. The technology is being investigated extensively for biomass gasification to meet the requirement of the green energy targets. ... -
Computational study of CO2 injection for enhanced oil recovery and storage
Hansen, Ole Christopher; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2020)Injection of supercritical carbon dioxide (CO2) for enhanced oil recovery (EOR), plays a vital role to minimize the impact of CO2 emissions. CO2-EOR refers to the oil recovery technique where supercritical CO2 is injected ... -
Cost-effective and safe oil production from existing and near-future oil fields
Moradi, Ali (Master thesis, 2020)Despite the rapid progress in the area of renewable energy, fossil fuels will remain the world’s most important energy source for the foreseeable future. Therefore, in order to meet future energy demands, increasing the ... -
CPFD model for prediction of flow behavior in an agglomerated fluidized bed gasifier
Furuvik, Nora Cecilie Ivarsdatter; Jaiswal, Rajan; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2019)Renewable energy sources have significant potential for limiting climate change and reducing greenhouse gas emissions due to the increased global energy demand. Fluidized bed gasification of biomass is a substantial ... -
A CPFD model to investigate the influence of feeding positions in a gasification reactor
Jaiswal, Rajan; Furuvik, Nora Cecilie Ivarsdatter; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2020)The efficiency of a gasification process is directly related to the rate of biomass conversion into product gas. The rate of fuel conversion depends on the interaction of fuel with the bed material, the gasifying agent, ... -
CPFD simulation of a fixed bed gasification reactor
Thapa, Rajan Kumar; Jaiswal, Rajan; Moldestad, Britt Margrethe Emilie (Chapter; Peer reviewed, 2020)Biomass gasification is regarded as one of the most promising energy recovery technologies. The gases produced from the biomass gasification can be used for heat and power production. Alternatively, they can be used for ...