Blar i USN Open Archive på forfatter "Moldestad, Britt Margrethe Emilie"
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Detailed One-Dimensional Model for Steam-Biomass Gasification in a Bubbling Fluidized Bed
Agu, Cornelius Emeka; Pfeifer, Christoph; Eikeland, Marianne Sørflaten; Tokheim, Lars-André; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2019)A one-dimensional unsteady state model is developed for simulation of biomass gasification in a bubbling fluidized bed. The proposed model accounts for the effect of hydrodynamic behavior of the fluidized bed by incorporating ... -
Diffusion of CO2 through polymer membranes
Olsen, Chatrine Høgseth; Augestad, Morten; Helland, Irene; Moldestad, Britt Margrethe Emilie; Eikeland, Marianne Sørflaten (Chapter; Peer reviewed, 2020)The food industry uses polymers as packaging to protect and maintain high quality and freshness of the product during distribution and storage. Polymers are permeable by gases like O2, CO2 and water vapour. In this paper, ... -
Distribution Of Co2 In Fractured Carbonate Reservoirs
Furuvik, Nora Cecilie Ivarsdatter; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2017)Deep geologic injection of supercritical carbon dioxide (CO 2 ) for enhanced oil recovery (EOR) has been widely used for improved oil recovery from depleted oilfields since early 1970s. The CO 2 injec - tion maintains the ... -
Distribution of Solids in a Fluidized Bed Operated without a Gas Distributor
Agu, Cornelius Emeka; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)Despite several advantages of a gas distributor, there are also some challenges in its application. Using a gas distributor increases the fluidizing gas compression cost. Due to deposition of fine particles and product of ... -
Effect of particle size on flow behavior in fluidized beds
Timsina, Ramesh; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie; Eikeland, Marianne Sørflaten (Peer reviewed; Journal article, 2019)The fluidization behaviour depends on particle properties such as particle size, sphericity, density and the properties of the fluidizing agent. In this study, the effects of different particle sizes on fluidization behaviour ... -
Effect of Superficial Gas Velocity on Bubbling Fluidized Bed Behaviour in a Biomass Gasifier
Agu, Cornelius Emeka; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2019)This study investigates the behaviour of bubbling fluidized beds in biomass gasification processes based on the variation of superficial gas velocity at different temperatures and air flowrates. In the paper, the operating ... -
Electrochemical systems of CO2 reduction on carbon nanotube electrodes for biogas production using microbes as catalyst
Biswas, Rahul (Master thesis, 2024)This study explores electrochemical systems as an innovative approach for CO2 utilization in biomethane production using the carbon-metal composite electrode material and microbes as catalyst. The emphasis has been given ... -
Enhanced sulfate removal- and deaeration package performance at Ivar Aasen
Nilsen, Espen (Master thesis, 2022)Ivar Aasen is an oil and gas field situated in the northern part of the Norwegian continental shelf. A part of their operational strategy is to maintain reservoir pressure at a desirable level by injecting a combination ... -
Evaluating the performance of advanced wells in heavy oil reservoirs under uncertainty in permeability parameters
Moradi, Ali; Ahmadpour Samani, Nastaran; Wahumpurage, Amaranath Sena Kumara; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2022)Advanced wells play a crucial role in maximizing the efficiency of oil production. To achieve a successful design for advanced wells, several parameters must be considered and evaluated. Uncertainty in these parameters can ... -
Experimental and computational studies of circulating fluidized bed
Moradi, Ali; Samani, Nastaran Ahmadpour; Mojarrad, Masih; Sharfuddin, Mohammad; Bandara, Janitha; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2020)Biomass gasification represents an efficient process for the production of power, heat and biofuels. Different technologies are used for gasification and this article focuses on a circulating fluidized bed (CFB) system. ... -
Experimental and computational studies on biomass gasification in fluidized beds
Basmoen, Tommy A.; Deeraksa, Chidapha; Nwosu, Chimunche F.; Qaredaghi, Ebrahim; Jaiswal, Rajan; Furuvik, Nora Cecilie Ivarsdatter; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2019)The world’s energy consumption is increasing, and research regarding utilization of renewable energy sources is crucial. Biomass for direct heating has been used for thousands of years, while in the last decades alternative ... -
Experimental and Computational study of Chemical Looping Combustion
Thapa, Rajan Kumar; Wijeratne, D. I. Erandi N.; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)In this paper, the fluidization properties of possible oxygen carriers in Chemical Looping Combustion (CLC) have been studied. Experiments were performed in a cold fluidized bed to study fluidization properties of particles ... -
Experimental and Computational Study of Oxygen Carriers in Chemical Looping Combustion
Thapa, Rajan Kumar; Wijeratne, D. I. Erandi N.; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)In this paper, the fluidization properties of possible oxygen carriers in Chemical Looping Combustion (CLC) have been studied. Experiments were performed in a cold fluidized bed to study fluidization properties of particles ... -
Experimental and computational study on the effect of ash deposition on fluid dynamic behavior in a bubbling fluidized bed gasifier
Thapa, Rajan Kumar; Thapa, Saroy; Jaiswal, Rajan; Furuvik, Nora Cecilie Ivarsdatter; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2019)The effect of ash deposition on fluid dynamic behavior in a fluidized bed gasification reactor has been studied using experimental and computational methods. The experiments were carried out using sand particles as bed ... -
Experimental Study and CFD Modelling of Minimum Fluidization Velocity for Geldart A, B and D Particles
Amarasinghe, Widuramina Sameendranath; Jayarathna, Chameera K.; Ahangama, Bovinda S; Tokheim, Lars-André; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2017)The aim of this study is to determine minimum fluidization velocity of three different particles which represent different Geldart classification groups and to compare the results with computational results. The experiments ... -
Experimental study and SEM-EDS analysis of agglomerates from gasification of biomass in fluidized beds
Furuvik, Nora Cecilie Ivarsdatter; Wang, Liang; Jaiswal, Rajan; Thapa, Rajan Kumar; Eikeland, Marianne Sørflaten; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2022)Fluidized bed gasification is an attractive conversion technology for biomass. However, processing biomass in fluidized beds suffers from ash related problems. In this work, bed agglomeration of wood pellets and grass ... -
Experimental study of agglomeration of grass pellets in fluidized bed gasification
Furuvik, Nora Cecilie Ivarsdatter; Jaiswal, Rajan; Moldestad, Britt Margrethe Emilie (Chapter; Peer reviewed, 2020)The agglomeration tendency during gasification of grass pellets in a bubbling fluidized bed reactor was studied. Particle agglomeration occurs as a consequence of interactions between the bed particles and the biomass ash ... -
Experiments and computational particle fluid dynamics simulations of biomass gasification in an air-blown fluidized bed gasifier
Timsina, Ramesh; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie; Eikeland, Marianne Sørflaten (Journal article; Peer reviewed, 2020)Experiments were performed in a pilot-scale bubbling fluidized bed gasification reactor with air as a fluidizing agent. Birch wood chips and sand particles were used as biomass and bed materials. Average molar product gas ... -
Flow behavior in an agglomerated fluidized bed gasifier
Furuvik, Nora Cecilie Ivarsdatter; Jaiswal, Rajan; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2019)The global energy demand has increased over the last decades and the need for utilization of energy produced from sustainable sources is stressed. Fluidized bed gasification of biomass is a thermochemical conversion process ... -
Heavy Oil Production With Energy Effective Steam-assisted Gravity Drainage
Høhrbye, Elin-Madeleine Jonskås; Mathiesen, Vidar; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2016)In reservoirs with extra heavy oil and bitumen, thermal methods are used to reduce the viscosity, in order to extract the oil. Steam-assisted gravity drainage (SAGD) is a thermal method where continuous steam injection is ...