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Differences in reactivity and burnout of coal and lignite in oxy-fuel atmosphere

Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The thermal reactivity of bituminous coal and lignite were measured under oxy-fuel and air environments using a thermogravimetric analyser (TGA) coupled with a differential scanning calorimeter (DSC), and a 1,5 meter long Drop Tube Furnace (DTF). The TGA/DSC analysis was carried out for heating rates lower than 1 deg/s, under non-isothermal conditions, at temperatures up to 900 °C. Heating rates higher than 104 deg/s were studied using a DTF maintained at 750 °C, 850 °C and 950 °C. The oxygen concentration, covering a wide and practical range, was varied in mixtures of O2/CO2 and O2/N2 in the range of 0 to 30 vol.% and 0 to 21 vol.%, respectively. Devolatilization experiments in the TGA revealed additional mass loss in a CO2 atmosphere, not observed in a N2 atmosphere, at temperatures higher than 720 °C for bituminous coal and 650 °C for lignite. Thermogravimetric results were not confirmed during test in the DTF. TGA experiments showed that the mass loss during oxidation was higher in air than in O2/CO2. Combustion tests performed using DTF indicated that replacing the nitrogen gas with carbon dioxide do not affect the burnout level.
Słowa kluczowe
Rocznik
Strony
57--65
Opis fizyczny
Bibliogr. 12 poz., rys., tab.
Twórcy
autor
  • Wroclaw University of Technology, Faculty of Mechanical and Power Engineering Energy Engineering and Technology Division Wybrzeze Wyspianskiego 27, 50 – 370 Wroclaw
autor
  • Wroclaw University of Technology, Faculty of Mechanical and Power Engineering Energy Engineering and Technology Division Wybrzeze Wyspianskiego 27, 50 – 370 Wroclaw
autor
  • Wroclaw University of Technology, Faculty of Mechanical and Power Engineering Energy Engineering and Technology Division Wybrzeze Wyspianskiego 27, 50 – 370 Wroclaw
autor
  • Wroclaw University of Technology, Faculty of Mechanical and Power Engineering Energy Engineering and Technology Division Wybrzeze Wyspianskiego 27, 50 – 370 Wroclaw
autor
  • Wroclaw University of Technology, Faculty of Mechanical and Power Engineering Energy Engineering and Technology Division Wybrzeze Wyspianskiego 27, 50 – 370 Wroclaw
Bibliografia
  • 1. Nowak W., Czakiert T., Spalanie tlenowe dla kotłów pyłowych i fluidalnych zintegrowanych z wychwytem CO2, Częstochowa 2012, Wydawnictwo Politechniki Częstochowskiej
  • 2. Rathnam R., Elliott L., Wall T., Liu Y., Moghtaderi B., Differences in reactivity of pulverized coal in air (O2/N2) and O2/CO2 – fuel (O2/CO2) conditions, Fuel Processing Technology, 2009, Vol. 90, 797 – 802
  • 3. Naredi P., Pisupati S. V., Comparison of char structural and reactivity parameters for air-coal and O2/CO2- coal combustion. In: 2007 international conference on coal science and technology, Nottingham, UK, 28-31 Aug 2007, London, UK, IEA Clean Coal Centre, paper 5A2
  • 4. Naredi P., Pisupati S. V., Oxy-fuel combustion: effect of recycled CO2 on pyrolysis behavior and char reactivity. In: Proceedings, twenty-fourth annual Pittsburgh coal conference, Johannesburg, South Africa, 10- 14 Sep 2007, Pittsburgh, PA, USA, Pittsburgh Coal Conference, paper 21-2
  • 5. Borrego A., Alvarez D., Comparison of chars obtained under O2/CO2 – fuel and conventional pulverized coal combustion atmospheres, Energy Fuels, 2007, Vol. 21, 3171 – 3179
  • 6. Arias B., Pevida C., Rubiera F., Pis J., Effect of biomass blending on coal ignition and burnout during O2/CO2 – fuel combustion, Fuel, 2008, Vol. 87, 2753 – 2759
  • 7. Varhegyi G., Szabo P., Jakab E.,Till F., Mathematical modeling of char reactivity in Ar–O2 and CO2–O2 mixtures, Energy & Fuels, 10, 1996, 1208–1214
  • 8. Branca C., Albano A., Di Blasi C., Critical evaluation of wood devolatilization mechanisms. Thermochim Acta, 2005, 429, 133–41
  • 9. Antal M.J., Várhegyi G., Cellulose pyrolysis kinetics: the current state of knowledge. Ind Eng Chem Res, 1995, 34,703–17
  • 10. Várhegyi G., Antal M.J., Jakab E., Szabo P., Kinetic modeling of biomass pyrolysis. J Anal Appl Pyrol, 1996, 42, 73–8
  • 11. Teng H., Wei Y.C., Thermogravimetric studies on the kinetics of rice hull pyrolysis and the influence of water treatment, Ind Eng Chem Res, 1998, 37, 3806–11
  • 12. van Krevelen D.W., Coal, Third Edition: Typology – Physics – Chemistry - Constitution, Amsterdam 1993, Elsevier Science.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-20aea4d0-30be-4f3d-8f7f-12e43657604a
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