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Control and operation of dividing-wall columns with vapor split manipulation
(Doctoral Theses at NTNU, 1503-8181; 2013:20, Doctoral thesis, 2013)Thermally coupled distillation arrangements with dividing-wall implemen- tation provide significant energy and capital savings compared to energy intensive conventional distillation arrangements. In this thesis, the focus ... -
Control Degrees of Freedom for Optimal Operation and Extending Remaining Useful Life
(Doctoral theses at NTNU;2020:188, Doctoral thesis, 2020)While the transition to renewable energy sources is happening faster than ever, traditional energy sources such as oil and gas still make up a large part of the energy portfolio, and will continue to do so for many years ... -
Control of a Continuous Flow Microreactor: Comparison of Decentralized PI-control, PI-control With Decoupling, and MPC
(Master thesis, 2021)Mikroreaktor-teknologi har sett en sterk økning i popularitet innenfor akademisk og industriell forskning de siste tiårene. De små dimensjonene introduserer mange fordeler og muligheter. Parallelt med økningen i antall ... -
Control of formaldehyde silver catalyst reactor system
(Master thesis, 2023)I denne oppgaven ble det undersøkt om den nåværende temperaturreguleringen avDyneas formaldehyd sølvkatalysatorprosess kan forbedres. Den nåværende temperaturreguleringen har rom for forbedring, ettersom den strever i visse ... -
Control of Steady-state Gradient of an Ammonia Reactor using Transient Measurements
(Journal article; Peer reviewed, 2018)This paper presents the application of a steady-state real-time optimization strategy using transient measurements to an ammonia synthesis reactor case. We apply a new method for estimating the steady-state gradient of the ... -
Control of steam bottoming cycles using nonlinear input and output transformations for feedforward disturbance rejection
(Peer reviewed; Journal article, 2022)In this paper we analyze the control problem for a steam cycle that produces power by recovering waste-heat from gas turbines on an offshore installation. The waste-heat recovery unit is based on once-through steam generator ... -
Control Solutions for Multiphase Flow: Linear and nonlinear approaches to anti-slug control
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:271, Doctoral thesis, 2013)Severe-slugging flow in offshore production flowlines and risers is undesirable and effective solutions are needed to prevent it. Automatic control using the top-side choke valve is a recommended anti-slug solution, but ... -
Control structure design for a CO2-refrigeration system with heat recovery
(Journal article; Peer reviewed, 2019)In this work, we analyze a generic supercritical CO2-refrigeration system with parallel compression, based on systems used for supermarket use. In order to maximize energy efficiency, this system has a “heat-recovery” ... -
Control Structure Design for Optimal Oparation of 4-Product Thermally Coupled Columns
(Lecture, 2011)Control and operation of energy efficient complex distillation arrangements like Kaibel and Petlyuk columns can be challenging. This paper discusses the control structure design for stabilizing ... -
Control Structure Design for Two Distillation Columns in Sequence
(Master thesis, 2014)Even for simple distillation systems with only two columns, the control problem can be significant. This project provides an initial outline of a systematic procedure for finding the optimal control structure, through ... -
Control structures for consistent inventory control with moving bottleneck
(Master thesis, 2020)Tre forskjellige variasjoner av regulering av innhold ble vurdert i denne rapporten, hver med sitt eget formål: Opprettholding av produksjon, hvor målet er å holde massestrømmene mellom prosessenheter konstant til tross ... -
Control structures with embedded process knowledge
(Master thesis, 2020)I denne oppgaven er det studert en ny metodikk for å transformere ikke-lineære prosesser til lineære prosesser som gir perfekt forstyrrelsesavvisning og dekopling ved bruk av en manipulert variabel (MV) transformasjon. ... -
Controllability Analysis of Ammonia Synthesis Loops
(Master thesis, 2018)Present ammonia synthesis loops normally operate under stationary conditions. Generally, ammonia synthesis loops can be slow to ramp up and down due to manual mode operation. Furthermore, load disturbances are not rejected ... -
Controlled doping of carbon catalyst supports by atomic replacement via gasification-assisted heteroatom doping
(Peer reviewed; Journal article, 2023)Due to a set of unique properties, carbon materials are applied as supports for metal-based catalysts in a wide variety of established and emerging (electro-)catalytical transformations. By introducing heteroatoms such as ... -
Controlled mineralisation and recrystallisation of brushite within alginate hydrogels
(Journal article; Peer reviewed, 2016-02)Due to high solubility and fast resorption behaviour under physiological conditions, brushite (CaHPO4⋅2H2O, calcium monohydrogen phosphate dihydrate, dicalcium phosphate dihydrate) has great potential in bone regeneration ... -
Controlling the self-assembly and optical properties of gold nanoclusters and gold nanoparticles biomineralized with bovine serum albumin
(Journal article; Peer reviewed, 2015)While the size-dependent optical properties of BSA-stabilized gold nanoclusters are well known, the time-dependent growth mechanism remains to be described. Herein, we systematically compare two synthesis methods with and ... -
Conversion of biomass derived synthesis gas into liquid fuels via the Fischer - Tropsch synthesis process: Effect of alkali and alkaline earth metal impurities and CO conversion levels on cobalt based catalysts
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:245, Doctoral thesis, 2014)The scope of the present work was to contribute to the development of Fischer-Tropsch biomass to liquids processes. In a Fischer-Tropsch process, a carbon containing feedstock such as natural gas, coal or biomass is first ... -
Conversion of Biomass to Aviation Fuel by Hydropyrolysis and Vapors Upgrading
(Master thesis, 2023)The world is moving towards more sustainable energy generation techniques and renewable energy sources, there has been a dire need for alternatives to come into play now and enormous studies have already been done for ... -
Conversion of Biomass-derived Synthesis Gas via the Fischer-Tropsch Synthesis using Cobalt-based Catalysts
(Master thesis, 2022)Dagens globale energiscenario og klimakrise motiverer utnyttelse av fornybare ressurser for å erstatte fossilt brensel. Biomasse er en av de mest lovende karbonnøytrale fornybare ressursene tilgjengelig for bærekraftig ...