05. Harjoitustyöt ja kurssitutkielmat / Coursework and Term papers, Final projects

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Yliopistossa suoritettujen opintojen harjoitus- ja lopputöitä / Coursework, term papers and final projects completed at the university

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Browsing 05. Harjoitustyöt ja kurssitutkielmat / Coursework and Term papers, Final projects by Keyword "absorption"

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    Characterization of photodarkening in ytterbium doped fibres
    (2007) Montiel i Ponsoda, Joan Jesus; Sähkö- ja tietoliikennetekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Honkanen, Seppo
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    CO2 absorption enthalpies measurements for carbon capture thermodynamic model validation
    (2013) Ferrer Serrano, Norma; Uusi-Kyyny, Petri; Kemian laitos; Kemian tekniikan korkeakoulu; School of Chemical Engineering; Alopaeus, Ville
    The capture of carbon dioxide from post-combustion emission is one of the challenges for reducing the release of greenhouse gases into the atmosphere. It is a mature technology but studies are still needed particularly in order to reduce gas treatment costs. In the present work, densities and enthalpies of absorption of CO2 in aqueous solutions of several systems of alkanolamines were measured at 298,15K. The experiments were carried out using a flow mixing calorimetric technique (Setaram C80) that permits measuring enthalpies of absorption of CO2 in a sorbent solution as a function of loading charge (moles of CO2 per mole of amine). Measurements were performed by increasing the loading charge up to the saturation of the solution. Saturated loading point can be determined from the experimental enthalpy data and the values of enthalpies of absorption were found independents of the amine concentration. Experimental enthalpies and densities data were compared with literature values.
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    Desulfurization of heavy fuel oil for power generation
    (2013) Gamero Rodriguez, Maria del Carmen; Koskinen, Jukka; Sundell, Juha-Pekka; Biotekniikan ja kemian tekniikan laitos; Kemian tekniikan korkeakoulu; School of Chemical Engineering; Lehtonen, Juha
    Gasification is a technologically advanced, environmentally friendly and proven technology for disposing high sulphur heavy fuel oils by converting them into clean combustible gas products, avoiding corrosion problems and environmental emissions. Due to the high sulphur content of heavy fuel oil, it is essential to find efficient technologies to remove H2S from synthesis gas prior to its utilization within gas engines for power generation, since their absolute H2S limit is 500 ppm. This thesis intends to provide realistic solutions for clean power generation and simultaneously for the problems of heavy residues in refineries. For this purpose different approaches were adopted and presented. In the literature part, several technologies to remove H2S from synthesis gas were reviewed, such as absorption, adsorption and catalytic hydro treatment. In the experimental part a complete process of gasification, syngas purification by means of absorption and power generation was modeled and simulated with ASPEN plus. Moreover, the overall performance was studied and an economic study based on CAPEX/OPEX was performed in order to evaluate the feasibility of the process and provide reliable results.
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    Mass transfer in three-phase reactive crystallization
    (2015-06-11) Ponzo, Paolo; Jakobsson, Kaj; Zhao, Wenli; Kemian tekniikan korkeakoulu; Alopaeus, Ville
    Three-phase reactive crystallization is a multi-step process which involves particles dissolution, gas absorption and precipitation. The purpose of this work is development and comparison of two kind of models for three-phase reactive crystallization. In order to do this, different models for gas absorption and precipitation were coupled with a only dissolution model. The models were compared by their implementation on MATLAB and simulating several experimental conditions from the literature in which CaCO3 and MgCO3 precipitation was operated in Ca(OH)2 –H2O-CO2 and Mg(OH)2 –H2O-CO2 systems respectively. In the first simplified model the reactions and precipitation in the film surrounding the gas-liquid interface were assumed to be negligible while in the second kind of model the phenomena occurring in the film were taken into account. The results obtained showed that the significance of the reactions and precipitation in the liquid film depends on some operational conditions such as the mass transfer resistance and the molar fraction of CO2 in the gas fed into the system. In particular in operational conditions in which a high mass transfer resistance is combined with a low concentration of CO2 in the inlet gas, the reaction and precipitation phenomena were predicted to occur mainly in the film. In this case the use of the simplified model significantly under-estimated of the mass transfer rate.