Blar i Institutt for prosess-, energi- og miljøteknologi på forfatter "Moldestad, Britt Margrethe Emilie"

Viser treff 21-40 av 65

    • 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 ...

    • 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 ...

    • Image Processing and Measurement of the Bubble Properties in a Bubbling Fluidized Bed Reactor 

      Jaiswal, Rajan; Moldestad, Britt Margrethe Emilie; Eikeland, Marianne Sørflaten; Nielsen, Henrik Kofoed; Thapa, Rajan Kumar (Journal article; Peer reviewed, 2022)
      The efficiency of a fluidized bed reactor depends on the bed fluid dynamic behavior, which is significantly influenced by the bubble properties. This work investigates the bubble properties of a bubbling fluidized bed ...

    • The Impact of Autonomous Inflow Control Valve on Improved Oil Recovery in a Thin-Oil-Rim Reservoir 

      Hosnaroudi, Soheila Taghavi; Aakre, Haavard; Tahami, Seyed Amin; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2024)
      Oil production from thin-oil-rim fields can be challenging as such fields are prone to gas coning. Excessive gas production from these fields results in poor production and recovery. Hence, these resources require advanced ...

    • Improved Models for Predicting Bubble Velocity, Bubble Frequency and Bed Expansion in a Bubbling Fluidized Bed 

      Agu, Cornelius Emeka; Tokheim, Lars-André; Eikeland, Marianne Sørflaten; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)
      An efficient design and operational control of a fluidized bed reactor relies on accurate prediction of bubble properties. This paper employs measurement of bed void fraction in determining the bubble velocity in a given ...

    • Improved multi-stage cross-flow fluidized bed classifier 

      Jayarathna, Chameera; Balfe, Michael; Moldestad, Britt Margrethe Emilie; Tokheim, Lars-Andre (Peer reviewed; Journal article, 2019)
      In the present work, improvements to a novel fluidized bed solids classification system previously published by Jayarathna et al. are discussed (Jayarathna et al., 2018 [1]). The system is designed for a high temperature ...

    • Improving bench scale design for polymerisation of green CO2-polymers 

      Larsen, Thomas S.; Sætre, Kai Arne; Ronasi, Sara; Haugen, Hildegunn H.; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)
      Plastic has become the most common material since the beginning of the 20th century and has become almost indispensable due to its durability, light weight and low costs. However, some of the characteristics also make the ...