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Träfflista för sökning "LAR1:cth ;conttype:(scientificother);pers:(Johnsson Filip 1960)"

Sökning: LAR1:cth > Övrigt vetenskapligt > Johnsson Filip 1960

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  • Andersson, Klas, 1977-, et al. (författare)
  • Experiments and modeling on oxy-fuel combustion chemistry during lignite-firing
  • 2007
  • Ingår i: The Proceedings of the 32nd International Technical Conference on Coal Utilization & Fuel Systems, Clearwater, USA, 2007.
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • This paper presents experimental and modeling work on the combustion chemistry of the oxy-fuel (O2/CO2 recycle) process with focus on the difference in NO formation between oxy-fuel and air-fired conditions. Measurements have been carried out in a 100 kW test unit, which facilitates oxy-fuel combustion with real flue gas recycle. These measurements include in-furnace gas concentrations and temperature profiles from lignite-fired tests. The tests comprise a reference test in air and three oxy- fuel test cases with different oxygen fractions in the recycled feed gas. Additional oxy-fuel experiments were performed in order to study the sensitivity of the NO formation to both stoichiometry and air ingress. The results show that for the burner settings used in this work, lignite oxy-combustion with a global oxygen fraction of 25 vol % in the feed gas results in flame temperature levels close to those during air-firing. Similar to previous work, it is seen that the NO emission levels in [mg/MJ] during oxy-fuel operation are reduced to less than 30 % of the emission level during air-fired conditions. The results from the modeling shows that the reduction of NO emissions during oxy-fuel combustion is caused by an increased destruction of formed and recycled NO. Further experimental tests on the OF 27 condition show that an increased stoichiometric ratio (from l = 1.18 to 1.41) as well as an increased N2 content in the feed gas (from about 1% to 15%) only has a small effect on the NO formation during oxy-combustion.
  • Berntsson, Thore, 1947-, et al. (författare)
  • Towards Sustainabel Oil Refinery - Pre-study for larger co-operation project
  • 2008
  • Rapport (övrigt vetenskapligt)abstract
    • In this report, the Chalmers EnergiCentrum (CEC) presents the results of a pre-study commissioned by Preem relating to the effective production of future vehicle fuels. This pre-study was made up of three studies focusing on energy streamlining, the utilisation of waste heat and carbon-dioxide separation and biorefinement relating to the gasification and hydration of vegetable oils. One of the common starting points for these studies was the current situation at the Preem refineries in Göteborg and Lysekil from where the measurement data were obtained and analysed. The report summarises the knowledge situation based on current research in the individual technical fields. The results present some interesting future opportunities for developing the sustainable production of future vehicle fuels. The sections vary, as the areas that have been examined differ and the sections have been written by different people. The reports ends with some joint conclusions and a number of questions which could be included and answered in a more extensive future main study, as part of a developed research partnership between Preem and the Chalmers University of Technology. The preliminary results of this work were analysed with the client at workshops on 1 October and 29 November 2007. The report is written in English combined with an extensive summary in Swedish including a proposal on a future main study. The study was conducted by the Chalmers EnergiCentrum (CEC), in collaboration with a number of researchers in the CEC’s network. They included Thore Berntsson, Jessica Algehed, Erik Hektor and Lennart Persson Elmeroth, all from Heat and Power Technology, Börje Gevert, Chemical and Biological Engineering, Tobias Richards, Forest Products and Chemical Engineering, Filip Johnsson and Anders Lyngfelt, Energy Technology, and Per-Åke Franck and Anders Åsblad, CIT Industriell Energianalys AB. The client, Preem, was represented by Bengt Ahlén, Sören Eriksson, Johan Jervehed, Bertil Karlsson, Gunnar Olsson, Ulf Kuylenstierna, Stefan Nyström, Martin Sjöberg and Thomas Ögren. Tobias Richards was responsible for compiling the report and Bertil Pettersson was the project manager.
  • Bäckström, Daniel, 1985-, et al. (författare)
  • Gas temperature and radiative heat transfer in oxy-fuel flames
  • 2012
  • Ingår i: The 37th International Technical Conference on Clean Coal & Fuel Systems, Clearwater USA, 3-7/6-2012. - 978-0-932066-37-4
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • This work presents measurements of the gas temperature, including fluctuations, and its influence on the radiative heat transfer in oxy-fuel flames. The measurements were carried out in the Chalmers 100 kW oxy-fuel test unit. The in-furnace gas temperature was measured by a suction pyrometer and by an optical system based on FTIR-spectroscopy. The radiation intensity was measured by a Narrow Angle Radiometer and the gas radiation was calculated with a Statistical Narrow Band model. The overall agreement between the two temperature measurement techniques was good. The optical system showed a lower temperature than the suction pyrometer in the low velocity regions of the furnace, a difference which is likely to be an effect of the purge gas added in the optical probe. The measured temperature fluctuations were evaluated by modeling of the gas radiation. The influence from the measured fluctuations on the radiative heat transfer shows no effect of turbulence-radiation interaction. However, by comparing with temperature fluctuations in other flames it can be seen that the fluctuations measured here are relatively small. Further research is needed to clarify to which extent the applied methods can account for the turbulence-radiation interaction in the investigated flame.
  • Ekvall, Thomas, 1986-, et al. (författare)
  • CO-KCl-SO2 interactions in an 80 kW propane-fired flame
  • 2014
  • Ingår i: the proceedings of the Impacts of Fuel Quality on Power production conference, 2014.
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • It is well known that combustion of biomass derived fuels may lead to problems with high-temperature corrosion (HTC). The HTC process is largely based on the release and transformation of chlorine, sulphur and alkali components during the combustion process. However, these components may also interact with other critical parts of the combustion chemistry and the present work focuses on how potassium chloride and sulphur dioxide influence the oxidation of carbon monoxide. This is investigated during combustion of propane (80 kW) applying both air and oxy-fuel combustion conditions. The experiments were carried out in Chalmers 100 kW oxy-fuel test facility in which sulphur dioxide and potassium chloride was added to the flame. The experimental results are also supported by modelling work including a detailed reaction mechanism of the related alkali-S-Cl chemistry. The results show that KCl promotes CO-oxidation in oxy-fuel combustion. However, for the experimental conditions tested in the present work, no significant effect was detected in air combustion. In addition, when adding water as well as SO2 to the flames, there were no significant effects on the measured CO concentrations in the respective flames.
  • Ekvall, Thomas, 1986-, et al. (författare)
  • Sulphation of potassium chloride in air and oxy-fuel combustion
  • 2013
  • Ingår i: The Proceedings of the 38th International Technical Conference on Clean Coal & Fuel Systems, June 2-6 2013, Clearwater, Florida, USA.
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • During combustion of biomass, alkali and chlorine species are released to the gas phase, species which can react to form corrosive salts that potentially may cause severe corrosion problems on heat transfer surfaces upon condensation. This corrosion process is referred to as high-temperature corrosion (HTC) and it limits steam data in biomass combustion, with corresponding limitation in thermal efficiency. The flue gas composition and also the HTC conditions can be altered by introducing a second fuel, e.g. coal for co-combustion. The flue gas composition can be altered even more drastically when applying oxy-fuel combustion where the concentration of combustion products are higher than in air firing due to the use of pure oxygen and flue gas recycling. In this work, the alkali sulphation process in different oxy-fuel and air-fuel atmospheres has been investigated by modelling the gas phase chemistry. The overall purpose is to examine the combined effects of oxy-combustion and co-combustion on the HTC process and to make a comparison with air-fired conditions. The flue gas composition in oxy-fuel combustion depends on the recirculation strategy used which in turn also influences the sulphation. According to the modelling results the degree of sulphation of gas-phase alkali metals is in general higher for oxy-fuel combustion compared to air-fuel combustion. It is concluded from the modelling results that an increased amount of sulphur and water contribute to a substantial effect on the degree of sulphation of alkali species. On the other hand, the modelling also shows that an increased content of HCl, which is present during wet recirculation, has a negative effect on the sulphation; the degree of sulphation is therefore lower in wet compared to dry recirculation. The effects of other important parameters such as sulphur-to-potassium and air-to-fuel ratios, temperature and residence time are also discussed further in the paper.
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