Papers by Porametr Arromdee
Waste and Biomass Valorization, Jun 19, 2020
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Energy & Fuels, Jun 15, 2010
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Applied Energy, Sep 1, 2010
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Biomass Conversion and Biorefinery, Dec 3, 2019
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Proceedings of the World Renewable Energy Congress – Sweden, 8–13 May, 2011, Linköping, Sweden, Nov 3, 2011
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In this study, a swirling fluidized-bed combustor (SFBC) using an annular spiral air distributor ... more In this study, a swirling fluidized-bed combustor (SFBC) using an annular spiral air distributor was fired with rice husk. In order to control NO emission from the combustor, rice husk was moisturized by adding water to ldquoas-receivedrdquo fuel, while CO emission was mitigated via injection of secondary air into the bed splash zone. The SFBC was tested at constant fuel feed rate for variable fuel-moisture content and primary air supply. Effects of the fuel quality and excess air on radial and axial temperature and gas (O2, CO and NO) concentration profiles in the reactor, as well as on the combustion efficiency and emissions, are discussed. Effective control of CO and NO emissions and high (> 99%) combustion efficiency are achievable when firing moisturized rice husk in this SFBC.
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Chemical Engineering and Processing, Mar 1, 2010
Abstract This paper presents an analysis of some measures leading to intensification of the combu... more Abstract This paper presents an analysis of some measures leading to intensification of the combustion process in a biomass-fuelled fluidized-bed combustor with a cone-shape bed (or ‘conical FBC’). Two combustors firing rice husks with elevated fuel-ash content were the focus of this study. Compared to the pilot 350-kWth conical FBC exhibiting combustion efficiency of up to 96%, the newly constructed 400-kWth combustor included geometrical and design modifications aimed at improving the combustion efficiency and emission performance of the reactor. Differences between the air distributors and Δp–u diagrams (accounting for the total pressure drop across the air distributor and gas–solid fluidized bed) for the two reactors are discussed. Axial temperature and gas concentration (O2, CO and NOx) profiles in the combustors were compared for similar operating conditions (excess air and heat release rate per unit cross-sectional area). At excess air of 40–60%, the bed temperature in the advanced conical FBC was substantially, by about 180 °C, higher than that in the pilot combustor, mainly, due to better fuel–air mixing and higher residence time of reactants. The formation and decomposition of CO and NO in the bed region as well as in the freeboard of these two combustors showed quite different trends under similar operating conditions. At excess air of 40–60%, the CO emission from the advanced conical FBC was found to be much (7–8 times) lower than that from the pilot combustor, while the NOx emissions were represented by almost the same values. High (over 99%) combustion efficiency was achieved when firing rice husk in the advanced 400 kWth conical FBC for the range of excess air.
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Applied Energy, Sep 1, 2012
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Chemical Engineering and Processing, Dec 1, 2012
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Energy, Ecology and Environment
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International Journal of Construction Management, 2019
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Hydrodynamic regimes and characteristics of a gas–solid bed were experimentally studied in the co... more Hydrodynamic regimes and characteristics of a gas–solid bed were experimentally studied in the conical section of a bubbling fluidized-bed combustor (FBC). Prior to tests, alumina sand of 0.3–0.5 mm particle sizes used as the inert bed material in the FBC was premixed with shredded peanut/tamarind shells in different mass fractions (MF): 0%, 2.5%, 5%, 7.5% and 10% (by wt.). Ambient air used as the fluidizing agent was injected into the conical alumina–biomass bed through a 13-bubble-cap air distributor. For each biomass fraction in the binary mixture, the pressure drop across the bed (Δp) was measured versus superficial velocity at the distributor exit (u) for three static bed heights (BH): 20 cm, 30 cm and 40 cm. The Δp-u diagrams were plotted for variable MF and BH and compared between the two biomass fuel options. Three sequent hydrodynamic regimes of the bed were found to occur in all test runs when increasing u from 0 to 4–5 m/s. With higher MF, main hydrodynamic characteristic...
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This paper presents the experimental results from a study of burning shredded peanut/tamarind she... more This paper presents the experimental results from a study of burning shredded peanut/tamarind shells in a bubbling fluidized-bed combustor with a cone-shape bed using alumina sand as the inert bed material. For both fuel options, the combustion tests were performed at the fuel feedrate of about 60 kg/h, when ranging excess air from about 20% to 80%. During each test run, temperature and concentrations of O2, CO, CxHy (as CH4) and NO were measured along the axial direction in the reactor as well as at stack. The axial temperature profiles in the reactor were found to be rather uniform and weakly affected by the fuel type and excess air. However, the axial profiles of distinct gaseous species showed similar trends for the two fuels with substantial effects from the fuel properties and operating conditions. The CO and CxHy emissions of the combustor can be effectively controlled via maintaining excess air. With increasing excess air, the NO emission was found to be increased remaining,...
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Engineering Journal, 2021
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Powder Technology, 2021
Abstract The study's main goal, as reported in this research paper, was to investigate the ga... more Abstract The study's main goal, as reported in this research paper, was to investigate the gas–solid flow behaviors in a twin cyclonic fluidized-bed combustor (T-FBC) in swirling mode under a range of operating conditions. Silica sand in three size ranges, 300–500 μm, 500–710 μm, and 710–1000 μm, with 1700 kg/m3 solid density was used as the bed material in the study's experimental tests and its computer simulations. The Eulerian–Eulerian approach for two-phase fluid flows was selected to investigate the cold hydrodynamic characteristics of gas–solid particles, at a constant ambient temperature, in the fluidized-bed combustor. The three different turbulence models; the standard k-e model, the renormalization group (RNG) k-e model, and the Reynolds Stress Models (RSM) were studied in order to select the most appropriate model. Finally, the RNG k-e turbulence model was applied in all simulations for both phases of our work. The computational simulations were performed using the same parameters and operating conditions as in the experimental tests, with the validity of the computational simulations thus experimentally verified. In the simulation results, it was shown that the increasing size of the bed particles, the solid hold-up tended to decrease, the time duration for initializing full-bed fluidization increased, and the bed fluctuation frequency decreased. When increasing excess air (EA), the simulation results showed the opposite trend. The secondary to total air ratio (S/T) had substantial effects on time duration to initialize bed fluidization and the bed fluctuation frequency in the swirling fluidized bed; however, it had slightly effects on the radial solid hold-up and radial solid velocity in the dense bed region.
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Waste and Biomass Valorization, 2020
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Biomass Conversion and Biorefinery, 2019
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2009 International Conference on Clean Electrical Power, 2009
In this study, a swirling fluidized-bed combustor (SFBC) using an annular spiral air distributor ... more In this study, a swirling fluidized-bed combustor (SFBC) using an annular spiral air distributor was fired with rice husk. In order to control NO emission from the combustor, rice husk was moisturized by adding water to ldquoas-receivedrdquo fuel, while CO emission was mitigated via injection of secondary air into the bed splash zone. The SFBC was tested at constant fuel feed rate for variable fuel-moisture content and primary air supply. Effects of the fuel quality and excess air on radial and axial temperature and gas (O2, CO and NO) concentration profiles in the reactor, as well as on the combustion efficiency and emissions, are discussed. Effective control of CO and NO emissions and high (> 99%) combustion efficiency are achievable when firing moisturized rice husk in this SFBC.
Bookmarks Related papers MentionsView impact
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Papers by Porametr Arromdee