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Fast Economic Model Predictive Control for a Gas Lifted Well Network
(Journal article; Peer reviewed, 2018)This paper considers the optimal operation of an oil and gas production network by formulating it as an economic nonlinear model predictive control (NMPC) problem. Solving the associated nonlinear program (NLP) can be ... -
Fast Sensitivity-Based Nonlinear Economic Model Predictive Control with Degenerate NLP
(Journal article; Peer reviewed, 2018)We present a fast sensitivity-based nonlinear model predictive control (NMPC) algorithm, that can handle non-unique multipliers in the discretized dynamic optimization problem. Non-unique multipliers may arise, for example ... -
A fast, low-cost, robust and high-throughput method for viral nucleic acid isolation based on NAxtra magnetic nanoparticles
(Peer reviewed; Journal article, 2023)The year of 2020 was profoundly marked by a global pandemic caused by a strain of coronavirus named severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the etiological agent of coronavirus disease 2019 (COVID-19). ... -
Feasibility study and modelling of multistage amine reclaimer
(Master thesis, 2013)One of the largest expenses in CO2 capture is the transport and disposal of waste from the amine reclaimer, and top up of fresh amine~\citep{KIP}. The main reason for this is because the waste stream contains quite large ... -
Feedback Real-Time Optimization Strategy Using a Novel Steady-state Gradient Estimate and Transient Measurements
(Journal article; Peer reviewed, 2019)This paper presents a new feedback real-time optimization (RTO) strategy for steady-state optimization that directly uses transient measurements. The proposed RTO scheme is based on controlling the estimated steady-state ... -
Feedforward, Cascade and Model Predictive Control Algorithms for De-Oiling Hydrocyclones: Simulation Study
(Peer reviewed; Journal article, 2021)Abstract: Maintaining the efficiency of the produced-water treatment system is important for the oil and gas industry, especially taking into consideration the environmental impact caused of the produced-water. De-oiling ... -
FIB/SEM Characterization of Paper Materials
(Master thesis, 2016)3D microscopy is of interest for structural characterization of paper materials to study the use of cellulose nanofibrils as a paper additive. Focused ion beam (FIB) tomography is a promising microscopy technique for this ... -
Field test of a pre-pilot scale hollow fiber facilitated transport membrane for CO2 capture
(Journal article; Peer reviewed, 2019)In this work, a pre-pilot scale hollow fiber membrane module with a PVA/ProK hybrid membrane containing up to 40 wt% amino acid salt was fabricated and tested infield for CO2 capture. The petroleum coke-fired flue gas ... -
Field trial of hollow fiber modules of hybrid facilitated transport membranes for flue gas CO2 capture in cement industry
(Peer reviewed; Journal article, 2020)Alarming increase in global CO2 emissions warrants acceleration of CO2 capture technologies. In this work, testing of pre-pilot scale membrane modules containing hybrid facilitated transport membranes in hollow fiber ... -
Filtration Properties of Ferric Hydroxide Precipitate in Nickel Production
(Chapter, 2018)Ferric iron removal from the nickel electrolyte at Glencore Nikkelverk AS in Kristiansand, Norway, is achieved by precipitation of iron hydroxide followed by filtration, and it is desirable to improve filtration properties ... -
Finding Self-optimizing Control Variables Using Process Data
(Master thesis, 2014)In this project we have studied a newly developed way to find self-optimizing variables. The method studied in this thesis uses data measurements, y, to fit a quadratic cost function. By using parameters found in the cost ... -
Fine-Tuning of Particle Size and Morphology of Silica Coated Iron Oxide Nanoparticles
(Journal article; Peer reviewed, 2023) -
Fischer-Tropsch Catalysts for Jet Fuel Production
(Master thesis, 2014)Diverse β-zeolite and β-zeolite/Fischer Tropsch catalysts were prepared under hydrothermal conditions to obtain a tailored jet fuel catalyst. The Fischer Tropsch catalyst that was employed is cobalt-based and it was provided ... -
Fischer-Tropsch conversion of biomass-derived synthesis gas to liquid fuels
(Journal article, 2013)Recent and ongoing research on Fischer-Tropsch catalysts for biomass conversion typically focus on the effects of impurities common in bio-derived synthesis gas, and also on the effect of different synthesis gas compositions ... -
Fischer-Tropsch reaction kinetics: Mathematical modeling and model fitting
(Master thesis, 2019)I denne masteroppgaven er en matematisk modell for Fischer-Tropsch syntesen foreslått. Modellen inkluderer effektene av vann på reaksjonskinetikk, selektiviteter, og deaktivering av katalysator. Modellen er basert på ... -
Fischer-Tropsch synthesis over an alumina-supported cobalt catalyst in a fixed bed reactor – Effect of process parameters
(Peer reviewed; Journal article, 2020)Fischer-Tropsch synthesis has been investigated over a commercial type cobalt-based catalyst (20 %Co/0.5 %Re/γ-Al2O3) by varying the H2/CO ratio (2.55–1.12), CO conversion (15–75 %), reaction temperature (210 °C, 230 °C), ... -
Fischer-Tropsch synthesis over cobalt supported catalysts
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:134, Doctoral thesis, 2005)The following catalysts have been studied by different characterization techniques and by kinetic experiments at FT conditions: 12 % Co/γ-Al2O3, 12 % Co - 0.5 % Re/γ-Al2O3, 12 % Co/SiO2, 12 % Co - 0.5 % Re/SiO2, 12 % Co/TiO2 ... -
Fischer-Tropsch synthesis – Influence of aerosol – deposited potassium salts on activity and selectivity of Co based catalysts
(Doctoral theses at NTNU;2018:104, Doctoral thesis, 2018)The effect of potassium salts (K2SO4, KNO3, KCl, K2CO3) on cobalt based Fischer-Tropsch catalysts has been studied experimentally and theoretically. In order to better understand the deactivation effect of potassium species, ... -
Fischer-Tropsch Synthesis: Conversion of Bio-Syngas to Hydrocarbons
(Master thesis, 2019)Dette prosjektet omhandler Fischer-Tropsch syntese over cobolt-baserte katalysatorer. Tolv eksperimenter ble utført i en to-reaktor rigg ved en rekke reaksjonsbetingelser, med formål om å innhente eksperimentell data til ... -
Fischer-Tropsch synthesis: Effect of CO conversion on CH4 and oxygenate selectivities over precipitated Fe-K catalysts
(Journal article; Peer reviewed, 2018)The explanation for CH4 selectivity for iron based Fischer-Tropsch catalysts in the low conversion region (i.e., <50%) remains elusive. In this contribution, the CO conversion effect was carefully examined over four K ...