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Sven Järås - One of the best experts on this subject based on the ideXlab platform.

  • selective catalytic oxidation of nh3 to n2 for catalytic combustion of Low Heating Value gas under lean rich conditions
    Applied Catalysis B-environmental, 2005
    Co-Authors: Henrik Kusar, Anders Ersson, M. Vosecký, Sven Järås
    Abstract:

    The selective catalytic oxidation (SCO) of ammonia to nitrogen has been examined over 5% Fe/Al2O3, 5% Mn/Al2O3, 20% Cuo/Al2O3, 1% Pt/20% CuO/Al2O3, 2% Rh/Al2O3 and a Fe zeolite (Fe-SH-27) under fue ...

  • Selective catalytic oxidation of NH3 to N2 for catalytic combustion of Low Heating Value gas under lean/rich conditions
    Applied Catalysis B-environmental, 2004
    Co-Authors: Henrik Kusar, Anders Ersson, M. Vosecký, Sven Järås
    Abstract:

    The selective catalytic oxidation (SCO) of ammonia to nitrogen has been examined over 5% Fe/Al2O3, 5% Mn/Al2O3, 20% Cuo/Al2O3, 1% Pt/20% CuO/Al2O3, 2% Rh/Al2O3 and a Fe zeolite (Fe-SH-27) under fue ...

  • Catalytic combustion of Low Heating Value gas mixtures: comparison between laboratory and pilot scale tests
    Catalysis Today, 2000
    Co-Authors: Magnus Berg, E Magnus Johansson, Sven Järås
    Abstract:

    Abstract Catalytic combustion of Low Heating Value fuels is a promising method for electricity production combining the use of a renewable fuel with ultra-Low emissions. In the present work, catalytic combustion of a Low Heating Value gas has been studied over monolithic catalysts in an atmospheric 30 kW pilot catalytic combustor connected to a wood pellet gasifier. The results have been compared to similar tests with a model gas mixture and a series of test in a laboratory scale reactor for monolithic samples. Various catalyst configurations have been tested, such as precious metal-based catalyst impregnated on modified alumina washcoats and hexaaluminate washcoats. Cordierite monoliths with various cells per square inch were used as supports, but hexaaluminate extruded monoliths were also used. The catalysts were combined in different segment series. The results show that it is possible to ignite the Low Heating Value gas at compressor outlet temperatures without the use of pre-burners over precious metal catalysts. Generally, trends and phenomena obtained in laboratory reactor operating close to isothermal could be confirmed in the pilot operating at close to adiabatic conditions. Further results, such as deactivation by sulphur compounds, fuel-NOx conversion and emissions of carbon monoxide and total hydrocarbons, are addressed in the paper.

Z A Zainal - One of the best experts on this subject based on the ideXlab platform.

  • experimental investigation of submerged flame in packed bed porous media burner fueled by Low Heating Value producer gas
    Experimental Thermal and Fluid Science, 2015
    Co-Authors: K A Alattab, John Chung Ho, Z A Zainal
    Abstract:

    Combustion inefficiencies and high pollutants emissions keep motivating researchers to enhance combustion technology. Producer gas fuel from biomass gasification with its Low Heating Value and high CO content requires a special combustor design for efficient burning. Porous media burner (PMB) has been widely investigated and proven to be well suited for Low Heating Value fuels lean combustion. This study aims at performance investigation of PMB fueled by producer gas from biomass gasification. A downdraft gasifier system along with a PMB burner and heat recovery unit has been developed. The PMB comprises two layers of 10 mm and 20 mm diameter upper and Lower alumina spheres packed, respectively. With PG Heating Value of about 5 MJ/m3, lean to ultra lean stable combustion was achieved with equivalence ratios (Φ) in the range of 0.33 < Φ < 0.71. Combustion layer temperature was in the range of 1300–1550 K. The Lowest recorded emissions from the PMB were 6 ppm and 230 ppm for CO and NOx respectively. The heat recovered from the burner was utilized in hot air production of 7 kWth that can be used for drying process in small industries. Maximum heat recovery heat exchanger effectiveness was about 93% with overall system efficiency of 54%.

  • design and performance of a pressurized cyclone combustor pcc for high and Low Heating Value gas combustion
    Applied Energy, 2011
    Co-Authors: K A Alattab, Z A Zainal
    Abstract:

    The combustion difficulties for Low Heating Value (LHV) gases derived from biomass fuels via a gasification process have led to more investigations into LHV gas combustors. Cyclone combustors provide good air/fuel mixing with long residence times. In this study, a small-scale pressurized cyclone combustor (PCC) was designed and optimized using computational fluid dynamics (CFD) simulation. The PCC, along with a turbocharger-based, two-stage microturbine engine, was first characterized experimentally with liquefied petroleum gas (LPG) fuel and then with both LPG and LHV gas derived from biomass in dual-fuel mode. The combustor achieved ultra-Low CO and NOx emissions of about 5 and 7Â ppm, respectively, for LPG fuel and of about 55 and 12Â ppm, respectively, in dual-fuel mode at the maximum second-stage turbine speed of 26,000Â rpm with stable turbine operation.

Henrik Kusar - One of the best experts on this subject based on the ideXlab platform.

Wlodzimierz Blasiak - One of the best experts on this subject based on the ideXlab platform.

K A Alattab - One of the best experts on this subject based on the ideXlab platform.

  • experimental investigation of submerged flame in packed bed porous media burner fueled by Low Heating Value producer gas
    Experimental Thermal and Fluid Science, 2015
    Co-Authors: K A Alattab, John Chung Ho, Z A Zainal
    Abstract:

    Combustion inefficiencies and high pollutants emissions keep motivating researchers to enhance combustion technology. Producer gas fuel from biomass gasification with its Low Heating Value and high CO content requires a special combustor design for efficient burning. Porous media burner (PMB) has been widely investigated and proven to be well suited for Low Heating Value fuels lean combustion. This study aims at performance investigation of PMB fueled by producer gas from biomass gasification. A downdraft gasifier system along with a PMB burner and heat recovery unit has been developed. The PMB comprises two layers of 10 mm and 20 mm diameter upper and Lower alumina spheres packed, respectively. With PG Heating Value of about 5 MJ/m3, lean to ultra lean stable combustion was achieved with equivalence ratios (Φ) in the range of 0.33 < Φ < 0.71. Combustion layer temperature was in the range of 1300–1550 K. The Lowest recorded emissions from the PMB were 6 ppm and 230 ppm for CO and NOx respectively. The heat recovered from the burner was utilized in hot air production of 7 kWth that can be used for drying process in small industries. Maximum heat recovery heat exchanger effectiveness was about 93% with overall system efficiency of 54%.

  • design and performance of a pressurized cyclone combustor pcc for high and Low Heating Value gas combustion
    Applied Energy, 2011
    Co-Authors: K A Alattab, Z A Zainal
    Abstract:

    The combustion difficulties for Low Heating Value (LHV) gases derived from biomass fuels via a gasification process have led to more investigations into LHV gas combustors. Cyclone combustors provide good air/fuel mixing with long residence times. In this study, a small-scale pressurized cyclone combustor (PCC) was designed and optimized using computational fluid dynamics (CFD) simulation. The PCC, along with a turbocharger-based, two-stage microturbine engine, was first characterized experimentally with liquefied petroleum gas (LPG) fuel and then with both LPG and LHV gas derived from biomass in dual-fuel mode. The combustor achieved ultra-Low CO and NOx emissions of about 5 and 7Â ppm, respectively, for LPG fuel and of about 55 and 12Â ppm, respectively, in dual-fuel mode at the maximum second-stage turbine speed of 26,000Â rpm with stable turbine operation.

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