Development of a high-temperature combustion catalyst system and prototype catalytic combustor turbine test results

Sadamori, H.; Tanioka, Takashi; Matsuhisa, T.

doi:10.1016/0920-5861(95)00156-8

Cited by 29 publications

(3 citation statements)

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“…Hence, essentially little, if any, catalytic activity may be exhibited by several of the channels while a majority of the channels may, on an individual basis, provide quite satisfactory performance. Because of this, the material passing through the channels having less catalytic activity may not undergo the catalytic reaction or at least not to the extent experienced by other portions of the reactants [23,24]. Further, when honeycomb catalysts are employed in exothermic catalytic reactions, they are subjected to excessive temperatures, often in excess of 1600 K to 2000 K or more, which can lead to deactivation of the catalytically-active components thereon and even adversely affect the skeletal support.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Fluid flow effects on the combustion characteristics and flame stability of methane-air mixtures in millimeter-scale burners

Chen

2022

Preprint

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This study relates to the fluid flow effects on the combustion characteristics and flame stability of methane-air mixtures in millimeter-scale burners. Numerical simulations are conducted using computational fluid dynamics to gain insights into burner performance such as temperatures, reaction rates, and flames. Fully simulations are performed that explicitly treat heat and mass transfer in the fluid as well as heat transfer in the wall. The effects of different design factors on flame stability are investigated. The effects of the velocity of fluid flow on flame stability and combustion characteristics are discussed. The factors affecting combustion characteristics are determined for cavity-stabilized burners. Particular focus is placed on determining essential factors that affect the performance of cavity-stabilized burners. The results indicate that the wall thermal conductivity and flow velocities are very important as they determine the upstream heat transfer, which is necessary for flame ignition and stability, and the material's integrity by controlling the existence of hot spots. Two modes of flame extinction occur: a spatially global type for large wall thermal conductivities and low flow velocities and blowout. There exists a narrow range of flow velocities that permit sustained combustion within a burner. For fast flows, blowout occurs, whereas for slow flows, global type extinction occurs due to slow convective heat transfer. For high inlet velocities the location of the flame shifts downstream with increasing flow rate due to the decrease in the convective timescale. For low inlet velocities, a sharp shift of the reaction zone downstream occurs with decreasing flow rate. This is due to the decrease in the heat generation rate.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Fluid flow effects on the combustion characteristics and flame stability of methane-air mixtures in millimeter-scale burners

Chen

2022

Preprint

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“…High activity is favored by a high catalyst surface area (Arai et al, 1986;Zwinkels et al, 1995). The activity and stability requirements are usually in conflict (McCarty and Wise, 1990), and hence engineering solutions have been proposed to circumvent the contradiction between activity and stability, such as a hybrid combustor (Furuya et al, 1987), a partial catalytic combustor (Dalla Betta et al, 1994), and a multimonolith combustor (Sadamori et al, 1994). The first two combustor concepts limit the catalyst temperature by converting only part of the fuel over the catalyst and the remainder in a homogeneous downstream combustion zone.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability of Complex Oxide Combustion Catalyst Supports

Zwinkels

Druesne

Menon

et al. 1998

Ind. Eng. Chem. Res.

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As part of a search for more thermostable supports for combustion catalysts for gas turbine applications, a series of complex oxide materials were prepared by sol−gel synthesis and two different coprecipitation routes. The materials were chosen on the basis of literature studies; two hexaaluminates (LaAl11O18 and BaMnAl11O19 - α), a perovskite (SrZrO3), a spinel (MgAl2O4), and a pyrochlore (La2Zr2O7). After synthesis, the materials were aged for 16 h in a flow of humid air at temperatures between 1100 and 1400 °C, simulating the actual conditions in a catalytic combustor. The aged samples were characterized by X-ray diffraction, nitrogen adsorption for determination of BET surface area, and scanning electron microscopy. The sol−gel materials generally exhibited higher thermal stability than their coprecipitated counterparts. One exception was LaAl11O18, which had the highest surface area of all materials, 8 m2/g, after aging at 1400 °C, both for the sol−gel synthesized and one coprecipitated material. The reaction paths for the high-temperature solid-state reactions depended on preparation procedure and stoichiometry of the product.

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“…1. Design goals of the catalytic combustor were proposed by one of authors as shown in Table 1 (Sadamori et al, 1994). The concept of the combustor is that the combustion occurs within the honeycomb-shaped combustion catalyst layer.…”

Section: Model Description (Experimental Apparatus)mentioning

confidence: 99%

Flow Analysis of High Pressure Catalytic Combustor for Gas Turbine

Tsujikawa

Fujii

Sadamori

et al. 1995

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

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The objective of this paper is modeling the mechanism of high temperature catalytic oxidation of natural gas, or methane. The model is two-dimensional steady-state, and includes axial and radial convection and diffusion of mass, momentum and energy, as well as homogeneous (gas phase) and heterogeneous (gas-surface) single step irreversible chemical reactions within a catalyst channel. Experimental investigations were also made of natural gas, or methane combustion in the presence of Mn-substituted hexaaluminate catalysts. Axial profiles of catalyst wall temperature, and gas temperature and gas composition for a range of gas turbine combustor operating conditions have been obtained for comparison with and development of a computer model of catalytic combustion. Numerical calculation results for low pressure agree well with experimental data. The calculations have been extended for high pressure (10 atms) operating conditions of gas turbine.

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Development of a high-temperature combustion catalyst system and prototype catalytic combustor turbine test results

Cited by 29 publications

References 0 publications

WITHDRAWN: Fluid flow effects on the combustion characteristics and flame stability of methane-air mixtures in millimeter-scale burners

WITHDRAWN: Fluid flow effects on the combustion characteristics and flame stability of methane-air mixtures in millimeter-scale burners

Thermal Stability of Complex Oxide Combustion Catalyst Supports

Flow Analysis of High Pressure Catalytic Combustor for Gas Turbine

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