Institutt for prosess-, energi- og miljøteknologi: Recent submissions
Now showing items 221-240 of 338
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Study of Fluidization Regimes using OpenFOAM Computational Fluid Dynamics
(Journal article; Peer reviewed, 2017)The objective of this study was using computational fluid dynamics simulation with OpenFOAM to study the fluidization properties for four types of particles classified as Geldart A, B, C and D. Fluidization regimes were ... -
Numerical modeling of the calcination process in a cement kiln system
(Journal article; Peer reviewed, 2017)The calcium carbonate decomposition into calcium oxide and carbon dioxide is a key process step in a cement kiln. The reaction requires thermal energy input, and pulverized coal is the fuel typically used for this purpose ... -
Methane from Syngas by Anaerobic Digestion
(Journal article; Peer reviewed, 2017)Anaerobic digestion (AD) is a prominent green technology used for methane production from organic waste. Previous studies have shown that the amount of CH4 produced during anaerobic digestion can be increased by adding ... -
Analysis of the effect of steam-to-biomass ratio in fluidized bed gasification with multiphase particle-in-cell CFD Simulation
(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. ... -
A Mathematical Theory for Mixing of Particulate Materials
(Doctoral thesis, 2006)A theoretical framework for sampling theory is developed. In this relation, concepts like mixture heterogeneity and representative samples are mathematically defined. Further, the relation between Gy's concepts of accuracy ... -
Raman Spectroscopy as an Online Monitoring Tool for CO2 Capture Process: Demonstration Using a Laboratory Rig
(Journal article; Peer reviewed, 2017)A laboratory CO2 capture rig at USN was used as a demonstration plant to show the feasibility of Raman spectroscopy for online monitoring of speciation in CO2 capture process. The spectroscopy was integrated to lean and ... -
13C and 15N NMR characterization of amine reactivity and solvent effects in CO2 capture
(Journal article; Peer reviewed, 2014)Factors influencing the reactivity of selected amine absorbents for carbon dioxide (CO2) capture, in terms of the tendency to form amine carbamate, have been studied. Four linear primary alkanolamines at varying chain ... -
NMR spectroscopy applied to amine–CO2–H2O systems relevant for post-combustion CO2 capture: A review
(Journal article; Peer reviewed, 2014)Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful non-invasive analytical technique for chemical analyses since direct measurements at a molecular level can be performed. In this work, a survey of NMR spectroscopy ... -
NMR-based carbamate decomposition constants of linear primary alkanolamines for CO2 capture
(Journal article; Peer reviewed, 2014)The amine carbamate related equilibrium (RNHCOO– + H2O ⇆ RNH2 + HCO3–) has been investigated with 13C NMR (Nuclear Magnetic Resonance) spectroscopy for a series of linear primary alkanolamines, and the apparent carbamate ... -
Determination of onset of bubbling and slugging in a fluidized bed using a dual-plane electric capacitance tomography system
(Journal article; Peer reviewed, 2017)For a successful application of fluidized beds in chemical reactions and solids circulation, the boundary of regime of operation such as bubbling and slugging regimes, needs to be clearly defined. This study provides a ... -
Speciation of MEA-CO2 adducts at equilibrium using Raman spectroscopy
(Journal article; Peer reviewed, 2014) -
Comparison of OpenFoam and ANSYS Fluent. Compitational Fluid Dynamic Simulation of Gas-Gas Single Phase Mixing with and without Static Mixer
(Chapter; Peer reviewed, 2016)Gas-gas single phase mixing were numerically evaluated with static mixer and without static mixer using OpenFoam and ANSYS Fluent codes. The main goal was the gas-gas mixing simulation comparison between ANSYS Fluent and ... -
Simulation and Cost Comparison of CO2 Liquefaction
(Journal article; Peer reviewed, 2016)Liquefaction of CO2 is an intermediate step for storage or ship transport. Two processes are suggested. The traditional method is based on external refrigeration and the other is an integrated refrigeration process. In the ... -
Heavy Oil Production With Energy Effective Steam-assisted Gravity Drainage
(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 ... -
Modelling anaerobic digestion during temperature and load variations
(Journal article; Peer reviewed, 2016)Experimental results and simulations based on the Anaerobic Digestion Model No.1 (ADM1) with temperature effects on kinetics were used to evaluate rate limiting steps in sludge bed anaerobic digestion (AD) during load and ... -
Characterization of biomass wood
(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 ... -
Using the quantum yields of photosystem II and the rate of net photosynthesis to monitor high irradiance and temperature stress in Chrysanthemum (Dendranthema grandiflora)
(Journal article; Peer reviewed, 2015)Under a dynamic greenhouse climate control regime, temperature is adjusted to optimise plant physiological responses to prevailing irradiance levels; thus, both temperature and irradiance are used by the plant to maximise ... -
High rate manure slurry anaerobic digestion
(Journal article, 2015)The study shows that high rate anaerobic digestion may be an efficient way to obtain sustainable energy recovery from slurries such as pig manure. High process capacity and robustness to 5% daily load increases are observed ... -
Computational study of fingering phenomenon in heavy oil reservoir with water drive
(Journal article, 2015)The objective of this paper is to numerically study the flow in heavy oil reservoir with water drive. The main focus is to investigate the viscous fingering phenomenon and how it affects the oil recovery. Two-dimensional ... -
Simulation of Gasification of Livestock Manure with Aspen Plus
(Conference object; Peer reviewed, 2015-11-25)Gasification is a flexible technology where all types of organic waste including biomass from manure can be used as feed to the reactor. The recovery of energy from solid waste offers several benefits including substantial ...