Browsing NTNU Open by Author "Hillestad, Magne"
Now showing items 1-20 of 85
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A gas to liquid Fischer-Tropsch process integrated with Solar Thermal Water Split - Techno-Economical Feasibility
Emhjellen, Morten Thomas (Master thesis, 2016)Hydrocarbons are used in many products, and are the primary energy source for current civilizations, mainly as combustible fuel. There is a rapidly growing demand for environmentally friendly and renewable energy sources ... -
A multifluid-PBE model for reactive bubbly flow: Applied to biofuel production via the Fischer- Tropsch synthesis operated in a slurry bubble column
Vik, Camilla Berge (Doktoravhandlinger ved NTNU;2018:291, Doctoral thesis, 2018)Summary of thesis: A multifluid-PBE model for reactive bubbly flow Although electricity is transforming the transportation sector, liquid fuels are believed to remain in demand in the near future. With the ... -
A multifluid-PBE model for simulation of mass transfer limited processes operated in bubble columns
Vik, Camilla Berge; Solsvik, Jannike; Hillestad, Magne; Jakobsen, Hugo Atle (Journal article, 2017)Modeling of reactive dispersed flows with interfacial mass transfer limitations require an accurate description of the interfacial area, mass transfer coefficient and the driving force. The driving force is given by the ... -
A numerical solution strategy for dynamic simulation of post-combustion CO2 capture
Enaasen, Nina; Tobiesen, Finn Andrew; Kvamsdal, Hanne Marie; Hillestad, Magne (Journal article; Peer reviewed, 2013)This paper describes in detail the numerical solution of a dynamic process developed for post-combustion absorption based CO2 capture. The method used in this work is sequential modular integration. This means that each ... -
Aerosol growth in CO2 absorption with MEA, modelling and comparison with experimental results
Svendsen, Hallvard Fjøsne; Majeed, Hammad; Knuutila, Hanna K; Hillestad, Magne; Evjen, Sigvart; Mejdell, T.; Einbu, A.; Hjarbo, Kai Wilhelm; Haugen, G.; Hoff, K.A. (Peer reviewed; Journal article, 2021)A new and improved aerosol model has been developed and tested against experimental data. An e-NRTL equilibrium model for MEA was extended to cover sulphuric acid containing droplets and validated against new eboulliometer ... -
Assessment of a membrane contactor process for pre-combustion CO2 capture by modelling and integrated process simulation
Usman, Muhammad; Hillestad, Magne; Deng, Liyuan (Journal article; Peer reviewed, 2018)A membrane contactor process for pre-combustion CO2 capture from shifted synthesis gas originated from IGCC power plant is assessed from the technical and economical point of views. The process is designed as pressure swing ... -
Bilevel Model Predictive Control of a Semi-Batch Emulsion Copolymerisation Reactor
Kjetså, Ellen (Master thesis, 2017)The objective of this thesis is to study the implementation of an on-line bilevel model predictive control (MPC) application to an emulsion copolymerisation process in a semi-batch reactor. Previous work has been performed ... -
Boosting carbon efficiency of the biomass to liquid process with hydrogen from power: The effect of H2/CO ratio to the Fischer-Tropsch reactors on the production and power consumption
Ostadi, Mohammad; Rytter, Erling; Hillestad, Magne (Journal article; Peer reviewed, 2019)Carbon efficiency of a biomass to liquid process can be increased from ca. 30 to more than 90% by adding hydrogen generated from renewable power. The main reason is that in order to increase the H2/CO ratio after gasification ... -
Carbon hollow fiber membranes for a molecular sieve with precise-cutoff ultramicropores for superior hydrogen separation
Lei, Linfeng; Pan, Fengjiao; Lindbråthen, Arne; Zhang, Xiangping; Hillestad, Magne; Nie, Yi; Bai, Lu; He, Xuezhong; Guiver, Michael D. (Peer reviewed; Journal article, 2021)Carbon molecular sieve (CMS) membranes with rigid and uniform pore structures are ideal candidates for high temperature- and pressure-demanded separations, such as hydrogen purification from the steam methane reforming ... -
Carbon Molecular Sieve Hollow Fiber Membranes for CO2 Removals
Lei, Linfeng (Doctoral theses at NTNU;2020:401, Doctoral thesis, 2020)New technologies that are more energy efficient could, if applied in the large-scale CO2 removal process, reduce carbon dioxide emissions, and achieve a low-carbon future. Compared to traditional amine-based absorption, ... -
Carbon molecular sieve membranes for biogas upgrading: Techno-economic feasibility analysis
He, Xuezhong; Chu, Yunhan; Lindbråthen, Arne; Hillestad, Magne; Hagg, May-Britt (Journal article; Peer reviewed, 2018)Biomethane, produced by biogas upgrading, has a great potential to replace part of the fossil fuel natural gas, and may be injected into a gas grid or used as compressed biomethane as vehicle fuel. The state-of-the-art ... -
Carbon Molecular Sieve Membranes for Hydrogen Purification from a Steam Methane Reforming Process
Lei, Linfeng; Lindbråthen, Arne; Hillestad, Magne; He, Xuezhong (Peer reviewed; Journal article, 2021)Asymmetric carbon molecular sieve (CMS) membranes prepared from cellulose hollow fiber precursors were investigated for H2/CO2 separation in this work. The prepared carbon membrane shows excellent separation performance ... -
Characterization and modelling of aerosol droplet in absorption columns
Majeed, Hammad; Knuutila, Hanna K; Hillestad, Magne; Svendsen, Hallvard Fjøsne (Journal article, 2017)Formation of aerosols can cause serious complications in industrial exhaust gas cleaning processes. Small mist droplets and fog formed can normally not be removed in conventional demisting equipment because their submicron ... -
Computational prediction of cellulose solubilities in ionic liquids based on COSMO-RS
Chu, Yunhan; Zhang, Xiangping; Hillestad, Magne; He, Xuezhong (Journal article; Peer reviewed, 2018)A computational approach is presented for prediction of cellulose solubilities in ionic liquids (ILs) based on COSMO-RS (Conductor-like Screening Model for Real Solvents). Thermodynamically stable molecular structures were ... -
Conceptual Design of a Floating Methanol Production Unit
Håbrekke, Åshild (Master thesis, 2013)Several configurations for synthesis gas production and methanol synthesis have been considered and simulated using the simulation tool Honeywell UniSim Design R400 and MATLAB. It was decided to use a process without recycle ... -
Conceptual Design of a Once‐Through Gas‐to‐Liquid Process Combined with Ammonia Synthesis
Ostadi, Mohammad; Hillestad, Magne (Journal article; Peer reviewed, 2018)Recently, a new process has been proposed for a once‐through gas‐to‐liquid (GTL) plant suitable for offshore applications. Here, cogeneration of ammonia is suggested. This is firstly because the main ingredients for ammonia ... -
Conceptual Process Design and Simulation of Membrane Systems for Integrated Natural Gas Dehydration and Sweetening
He, Xuezhong; Kumakiri, Izumi; Hillestad, Magne (Peer reviewed; Journal article, 2020)Subsea natural gas processing attracts increased interest due to the smaller environmental footprint. Natural gas (NG) dehydration and sweetening are the main processing steps to avoid pipeline plugging and corrosion caused ... -
Dehydration and Compression of Contaminated CO2-rich Gas
Graff, Vidar (Master thesis, 2011)The use and demand of energy by exploiting fossil fuels is increasing. Carbon Capture and Storage (CCS) may be the solution to achieve decreased emissions, from various emitters of climate gases such as carbon dioxide. By ... -
Demonstration of non-linear model predictive control of post-combustion CO2 capture processes
Hauger, Svein Olav; Flø, Nina Enaasen; Kvamsdal, Hanne Marie; Gjertsen, Fredrik; Mejdell, Thor; Hillestad, Magne (Journal article; Peer reviewed, 2019)Nonlinear model predictive control applications have been deployed on two large pilot plants for post combustion CO2 capture. The control objective is formulated in such a way that the CO2 capture ratio is controlled at a ... -
Design configurations of the methanol synthesis loop
Bøhn, Kristian (Master thesis, 2011)In recent years the chemical industry has undergone considerable changes due to increased environmental regulations and energy costs. This master thesis has evaluated three different design considerations of the methanol ...