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  • Ajdari, Sima, 1985-, et al. (författare)
  • Modeling the Nitrogen and Sulfur Chemistry in Pressurized Flue Gas Systems
  • 2015
  • Ingår i: Industrial & Engineering Chemistry Research. - 0888-5885. ; 54:4, s. 1216-1227
  • Tidskriftsartikel (refereegranskat)abstract
    • A rate-based model is developed to elucidate the chemistry behind the simultaneous absorption of NOx and SOx under pressurized conditions (pressures up to 30 bar) that are applicable to the flue gases obtained from CO2 capture systems. The studied flue gas conditions are relevant to oxy-fuel and chemical-looping combustion systems. The kinetics of the reactions implemented in the model is based on a thorough review of the literature. The chemistry of nitrogen, sulfur, and N-S interactions are evaluated in detail, and the most important reaction pathways are discussed. The effects of pH, pressure, and flue-gas composition on the liquid-phase chemistry are also examined and discussed. Simulations that use existing kinetic data reveal that the pH level has a strong influence on the reaction pathway that is followed and the types of products that are formed in the liquid phase. In addition, the pressure level and the presence of NOx significantly affect the removal of SO2 from the flue gas.
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  • Almendros-Ibáñez, J. A., et al. (författare)
  • Voidage distribution around bubbles in a fluidized bed
  • 2010
  • Ingår i: Powder Technology. - 0032-5910. ; 197:1, s. 73-82
  • Tidskriftsartikel (refereegranskat)abstract
    • n this work, a new method for measuring void fraction distribution around endogenous bubbles in a 2D fluidized bed is presented. The technique is based on illuminating a transparent-wall 2-dimensional bed with diffuse light from the rear and recording the distribution of light that penetrates the bed. The recording is made with a high speed video-camera, which gives frames with grey level corresponding to the light penetration and from which the voidage distribution around the bubbles can be determined. In this way, voidage distribution in the region very close to the bubble contour (r/Rb less, approximate 1.2) is obtained, which was not possible in previous studies due to limitations in spatial resolution. A correlation is proposed for the voidage at the contour of the bubble, with the voidage depending on the radial position and the polar angle. In addition, the effect of the voidage distribution on the throughflow crossing the bubbles was studied and an increase of 20% was determined for the average bubble geometry of the more than 100 bubbles analysed.
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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.
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Pallares, David, 197 ... (48)
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