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S E Dorris - One of the best experts on this subject based on the ideXlab platform.

  • use of mixed conducting membranes to produce hydrogen by water dissociation
    International Journal of Hydrogen Energy, 2004
    Co-Authors: U Balachandran, T H Lee, S Wang, S E Dorris
    Abstract:

    Abstract We have studied the production of hydrogen by water dissociation at moderate temperatures (700–900°C) with novel mixed-conducting membranes. Hydrogen production rates were investigated as a function of temperature, water partial pressure, membrane thickness, and Oxygen chemical Potential gradient across the membranes. The hydrogen production rate increased with both increasing moisture concentration and Oxygen chemical Potential gradient. A hydrogen production rate of 6 cm 3 ( STP )/ min cm 2 was measured with a 0.10-mm-thick membrane at 900°C and 50 vol % water vapor on one side of the membrane and 80% hydrogen (balance helium) on the other side. Hydrogen was used as a model gas on one side of the membrane to establish a High Oxygen Potential gradient; however, another reducing gas, methane, was substituted in one experiment to maintain the High Oxygen Potential gradient. The hydrogen production rate increased with decreasing membrane thickness, but surface kinetics played an important role as membrane thickness decreased.

U Balachandran - One of the best experts on this subject based on the ideXlab platform.

  • use of mixed conducting membranes to produce hydrogen by water dissociation
    International Journal of Hydrogen Energy, 2004
    Co-Authors: U Balachandran, T H Lee, S Wang, S E Dorris
    Abstract:

    Abstract We have studied the production of hydrogen by water dissociation at moderate temperatures (700–900°C) with novel mixed-conducting membranes. Hydrogen production rates were investigated as a function of temperature, water partial pressure, membrane thickness, and Oxygen chemical Potential gradient across the membranes. The hydrogen production rate increased with both increasing moisture concentration and Oxygen chemical Potential gradient. A hydrogen production rate of 6 cm 3 ( STP )/ min cm 2 was measured with a 0.10-mm-thick membrane at 900°C and 50 vol % water vapor on one side of the membrane and 80% hydrogen (balance helium) on the other side. Hydrogen was used as a model gas on one side of the membrane to establish a High Oxygen Potential gradient; however, another reducing gas, methane, was substituted in one experiment to maintain the High Oxygen Potential gradient. The hydrogen production rate increased with decreasing membrane thickness, but surface kinetics played an important role as membrane thickness decreased.

T H Lee - One of the best experts on this subject based on the ideXlab platform.

  • use of mixed conducting membranes to produce hydrogen by water dissociation
    International Journal of Hydrogen Energy, 2004
    Co-Authors: U Balachandran, T H Lee, S Wang, S E Dorris
    Abstract:

    Abstract We have studied the production of hydrogen by water dissociation at moderate temperatures (700–900°C) with novel mixed-conducting membranes. Hydrogen production rates were investigated as a function of temperature, water partial pressure, membrane thickness, and Oxygen chemical Potential gradient across the membranes. The hydrogen production rate increased with both increasing moisture concentration and Oxygen chemical Potential gradient. A hydrogen production rate of 6 cm 3 ( STP )/ min cm 2 was measured with a 0.10-mm-thick membrane at 900°C and 50 vol % water vapor on one side of the membrane and 80% hydrogen (balance helium) on the other side. Hydrogen was used as a model gas on one side of the membrane to establish a High Oxygen Potential gradient; however, another reducing gas, methane, was substituted in one experiment to maintain the High Oxygen Potential gradient. The hydrogen production rate increased with decreasing membrane thickness, but surface kinetics played an important role as membrane thickness decreased.

S Wang - One of the best experts on this subject based on the ideXlab platform.

  • use of mixed conducting membranes to produce hydrogen by water dissociation
    International Journal of Hydrogen Energy, 2004
    Co-Authors: U Balachandran, T H Lee, S Wang, S E Dorris
    Abstract:

    Abstract We have studied the production of hydrogen by water dissociation at moderate temperatures (700–900°C) with novel mixed-conducting membranes. Hydrogen production rates were investigated as a function of temperature, water partial pressure, membrane thickness, and Oxygen chemical Potential gradient across the membranes. The hydrogen production rate increased with both increasing moisture concentration and Oxygen chemical Potential gradient. A hydrogen production rate of 6 cm 3 ( STP )/ min cm 2 was measured with a 0.10-mm-thick membrane at 900°C and 50 vol % water vapor on one side of the membrane and 80% hydrogen (balance helium) on the other side. Hydrogen was used as a model gas on one side of the membrane to establish a High Oxygen Potential gradient; however, another reducing gas, methane, was substituted in one experiment to maintain the High Oxygen Potential gradient. The hydrogen production rate increased with decreasing membrane thickness, but surface kinetics played an important role as membrane thickness decreased.

Cheng Qiang - One of the best experts on this subject based on the ideXlab platform.

  • Study of stand-support sintering to achieve High Oxygen Potential in iron ore sintering to enhance productivity and reduce CO content in exhaust gas
    'Elsevier BV', 2020
    Co-Authors: Wang Yaozu, Liu Zhengjian, Zhang Jianliang, Zhang Yapeng, Niu Lele, Cheng Qiang
    Abstract:

    Coarse coke particles, thick combustion zone, and poor thermal permeability during sintering have been widely reported to lead to incomplete solid fuel combustion and low Oxygen Potential, which induces the formation of harmful gas and decreases the energy efficiency. To solve these problems, stand-support sintering with an ultrathick 1000 mm bed was first proposed in this paper. The influences of the stand height and coke size on the process parameters and sinter quality were studied through a series of experiments. The results showed that the average gas flow velocity increased from 0.24 m/s to 0.32 m/s and the maximum combustion zone thickness decreased from 202 mm to 140 mm, which indicated that stand-support sintering could substantially improve the thermal permeability and enhance the oxidizing atmosphere. The fuel consumption was reduced by 1.28 kg/t (2.25%), the generated CO in exhaust gas was reduced, and the production efficiency increased by 17.4% when the stand height increased from 0 to 500 mm. Moreover, a 3D High-energy X-ray computerized tomography (CT) scanner was first used to quantitatively confirm the effect of the stand on the distribution and size of the pores in the whole sinter cake. Research findings showed that the porosity increased by 7.1% when the height of the stand increased from 0 to 500 mm, which further illustrated the effect of stand-support sintering. The present study provided an effective way to optimize the energy efficiency and reduce the CO content in exhaust gas