Browsing Institutt for prosess-, energi- og miljøteknologi by Issue Date

Now showing items 241-260 of 333

    • Doctorateness across Higher Education Institutions in Norway 

      Burner, Tony; Bjerkholt, Eva; Gaathaug, André Vagner; Kleiven, Synne; Ljoså, Tone Marte (Journal article; Peer reviewed, 2020)
      This article investigates doctorateness in Norway by evaluating the juridical regulations for doctoral studies at all PhD-awarding universities and university colleges according to the following categories: admission, ...

    • Off-field Testing of Grid Scenarios at Medium Voltage in Flexible AC Transmission Systems involving Wind Energy 

      Lorenzen, Helge; Timmerberg, Josef; Lüken, Tim; Mylvaganam, Saba (Chapter, 2020)
      As a result of the geographical location of north-western Germany, the local grid operator EWE NETZ has a pioneer role with respect to the integration of renewable energy sources in existing AC transmission systems. About ...

    • 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 ...

    • Carbon dioxide solubility in mixtures of methyldiethanolamine with monoethylene glycol, monoethylene glycol–water, water and triethylene glycol 

      Skylogianni, Eirini; Perinu, Cristina; Cervantes Gameros, Blanca Y.; Knuutila, Hanna K. (Peer reviewed; Journal article, 2020)
      Carbon dioxide solubility in non-aqueous and aqueous mixtures of methyldiethanolamine (MDEA) with monoethylene glycol (MEG) was studied due to the relevance of these solvents for the combined acid gas removal and hydrate ...

    • Techno-Economic Assessment of Different Heat Exchangers for CO2 Capture 

      Aromada, Solomon Aforkoghene; Eldrup, Nils Henrik; Normann, Fredrik; Øi, Lars Erik (Peer reviewed; Journal article, 2020)
      We examined the cost implications of selecting six different types of heat exchangers as the lean/rich heat exchanger in an amine-based CO2 capture process. The difference in total capital cost between different capture ...

    • Analysing consequences of infiltration and inflow water (I/I-water) using cost-benefit analyses 

      Sola, Kristin Jenssen; Bjerkholt, Jarle Tommy; Lindholm, Oddvar G.; Ratnaweera, Harsha (Peer reviewed; Journal article, 2020)
      The Municipality of Asker (Norway) is at risk of not meeting the water quality targets set by the European Union Water Framework Directive within the stipulated timeframe. While there are multiple factors negatively impacting ...

    • 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 ...

    • Integrating Syngas Fermentation into a Single-Cell Microbial Electrosynthesis (MES) Reactor 

      Sivalingam, Vasan; Ahmadi, Vafa; Babafemi, Omodara; Dinamarca, Carlos (Peer reviewed; Journal article, 2020)
      This study presents a series of experiments to test the integration of syngas fermentation into a single-cell microbial electrosynthesis (MES) process. Minimal gas–liquid mass transfer is the primary bottleneck in such ...

    • Ammonium as a Carbon-Free Electron and Proton Source in Microbial Electrosynthesis Processes 

      Sivalingam, Vasan; Dinamarca, Carlos; Arachchige, Gamunu L. Samarakoon; Winkler, Dietmar; Bakke, Rune (Peer reviewed; Journal article, 2020)
      Biogas upgrading to biomethane with microbial electrosynthesis (MES) is receiving much attention due to increasing biomethane demands and surplus renewable energy. Research has demonstrated the feasibility of MES to increase ...

    • Simple modelling approach using Modelica for microbial electrosynthesis 

      Arachchige, Gamunu L. Samarakoon; Winkler, Dietmar; Sivalingam, Vasan; Dinamarca, Carlos; Bakke, Rune (Peer reviewed; Journal article, 2020)
      This study intends to develop a simple mathematical model that contributes to the integration of Microbial Electrosynthesis (MES) in AD to reduce CO2 to CH4. Open-source modelling language Modelica was used to build the ...

    • Model Based Early Kick/Loss Detection and Attenuation with Topside Sensing in Managed Pressure Drilling 

      Jinasena, Asanthi; Holta, Haavard H. F.; Jondahl, Morten Hansen; Welahettige, Prasanna Kumara Welahetti; Aamo, Ole Morten; Sharma, Roshan; Viumdal, Håkon; Lie, Bernt (Peer reviewed; Journal article, 2020)
      Early kick/loss detection is a crucial part of safe well control, and it plays a major role in the reduction of risk and non-productive time in drilling. In conventional drilling, topside sensing is used for early kick/loss ...

    • Thermophilic methane production from hydrothermally pretreated norway spruce (Picea abies) 

      Ghimire, Nirmal; Bakke, Rune; Bergland, Wenche Hennie (Peer reviewed; Journal article, 2020)
      Norway spruce (Picea abies) is an industrially important softwood species available in northern Europe and can be used to produce bio-methane after proper pretreatment to overcome its recalcitrant complex structure. Hot ...

    • Improving gas distribution and evaporation in gas cooling tower at Norcem Brevik 

      Kasin, Fredrik; Larsen, Are; Andersen, Christian; Jaiswal, Rajan; Thapa, Rajan Kumar (Peer reviewed; Journal article, 2020)
      In this work, the effect of the geometry of a GCT (Gas Cooling Tower) on the flue gas distribution in a cooling tower in Norcem, Brevik is investigated by using CPFD (Computational Particle Fluid Dynamics) modeling and ...

    • Anaerobic Digestion of Hemicellulosic Sugars Implemented in ADM1 

      Karlsen, Vibeke Bredvold; Ghimire, Nirmal; Bakke, Rune; Bergland, Wenche Hennie (Peer reviewed; Journal article, 2020)
      Lignocellulosic biomass is a sustainable and renewable source for both solids like biochar and biomethane by anaerobic digestion (AD). Hot water extraction (HWE) improves the total utilization of the biomass and produces ...

    • 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 ...

    • Pyrolysis of plastic waste to environmental friendly products 

      Pandey, Umesh; Stormyr, Jan Arild; Hassani, Alireza; Jaiswal, Rajan; Haugen, Hildegunn Hegna; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2020)
      Pyrolysis of plastics is one of the efficient ways to recover plastic waste. Pyrolysis refers to a thermal degradation of long-chain organic molecules into smaller hydrocarbons. Many ongoing research studies are trying to ...

    • 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. ...

    • 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, ...

    • 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 ...

    • 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, ...