Blar i Publikasjoner fra CRIStin på forfatter "Jaiswal, Rajan"

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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 ...

    • 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 ...

    • 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 ...

    • 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 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 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Investigation of the segregation and mixing behavior of biomass in a bubbling fluidized bed reactor using a CPFD model 

      Jaiswal, Rajan; Furuvik, Nora Cecilie Ivarsdatter; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2019)
      Segregation of biomass in a gasification reactor is an inevitable problem that can jeopardize the advantages such as uniform temperature control and proper mass circulation, and good solid-gas contacting area of the fluidized ...

    • Method of identifying an operating regime in a bubbling fluidized bed gasification reactor 

      Jaiswal, Rajan; Furuvik, Nora Cecilie Ivarsdatter; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2020)
      This work presents a new method for identifying the bubbling regime of a fluidized bed gasification reactor. The method has been developed using experimental measurements and a computational model. Pressure drops are ...

    • 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 ...

    • Simulation and optimization of screw feeder in a bubbling fluidized bed gasification reactor 

      Thapa, Rajan Kumar; Vaa, Trym Fehn; Vaa, Oddvin; Jaiswal, Rajan; Jecmenica, Mladen (Journal article; Peer reviewed, 2022)
      A fluidized bed biomass gasification reactor is used to produce syngas from biomass and municipal wastes. Gasification is a flexible technology where many different types of feedstocks can be used. The University of ...

    • Study of agglomeration in fluidized bed gasification of biomass using CPFD simulations 

      Furuvik, Nora Cecilie Ivarsdatter; Jaiswal, Rajan; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2019)
      Fluidized beds have been widely applied for the gasification of biomass. However, at high temperatures ash melting and subsequently bed agglomeration may occur. When biomass is used for thermal conversion processes, inorganic ...

    • Study of agricultural waste gasification in an air-blown bubbling fluidized bed using a CPFD model 

      Jaiswal, Rajan; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2020)
      Gasification using a fluidized bed is a promising technology to convert agricultural residues into product gases. In this work, the syngas production potential from agricultural waste (grass pellets) is studied using ...

    • Study of fluidized bed regimes using Computational Particle Fluid Dynamics 

      Jaiswal, Rajan; Agu, Cornelius Emeka; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)
      The fluidization technology has a wide range of applications. In chemical synthesis, fluidized bed is used to enhance heat and mass transfer between the reacting species. More application of this technology can also be ...