Generic Behaviour of Propane Combustion in Fluidized Beds

Ribeiro, Leonardo D.; Pinho, Carlos

doi:10.1205/cerd.82.12.1597.58039

Cited by 18 publications

(14 citation statements)

References 5 publications

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“…The bed was formed by silica sand particles in the 300–355 μm range with 2600 kg/m 3 density . The mass flow rate of the fluidizing air was measured by an orifice plate flow meter using an Omega Engineering differential pressure transducer, Model PX143.…”

Section: Methodsmentioning

confidence: 99%

Determination of Fluidized Bed Combustion Kinetic and Diffusive Data of Four Wood Chars from the Central Region of Portugal

Pereira

Pinho

2013

Energy Fuels

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The fluidized bed reactor is suitable for the combustion of biomass solid fuels because of its advantages in terms of pollution control. At the same time it is a useful laboratory tool to determine kinetic and diffusive combustion data in operating conditions similar to those found in industrial systems. Because of the heterogeneous nature of biomass, available information on its combustion is still limited. During the combustion of ligneous biomass, the burning of the solid carbonaceous residues formed after the initial steps of drying and volatiles release is the time-consuming step. In the present work, kinetic and diffusive data from the fluidized bed combustion of chars produced from four Portuguese wood speciesQuercus ilex (holm oak), Eucalyptus globulus (eucalyptus), Pinus pinaster (maritime pine), and Quercus suber (cork oak)were obtained in the 750–900 °C temperature range. Subsequently, activation energies and pre-exponential factors were calculated from the Arrhenius plot of the kinetic data. The obtained activation energies from 38 to 121 kJ/mol are coherent with results obtained for other wood chars and demonstrate that the fluidized bed technology is a fruitful and reliable methodology to achieve a collection of results of real and industrial interest. The main goal of the present work is to widen the information on the kinetic and diffusive data of wood chars in order to better understand the mechanisms of ligneous biomass combustion, and the data now published increases the range of available kinetic data on wood char combustion.

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Section: Methodsmentioning

confidence: 99%

Determination of Fluidized Bed Combustion Kinetic and Diffusive Data of Four Wood Chars from the Central Region of Portugal

Pereira

Pinho

2013

Energy Fuels

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“…The kinetic mechanisms do not proceed in the particulate phase owing to quenching by heterogeneous reactions [12,33]. So, it will be assumed that the kinetic mechanisms only proceed within the slugs, and are quenched outside them.…”

Section: Modelmentioning

confidence: 99%

Combustion of slugs of propane and air moving up through an incipiently fluidized bed

Ribeiro

Pinho

2007

Combustion Theory and Modelling

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A mathematical model is proposed to show the evolution of temperature, chemical composition and energy release or transfer in slugs, clouds and particulate phase, in a fluidized bed where there are slugs, of a mixture of air and propane, moving up through the particulate phase previously set in the state of incipient fluidization with air. The analysis begins as the slugs are formed at the orifices of the distributor, until they explode inside the bed or emerge at the free surface. The model also makes the analysis of what happens in the gaseous mixture that leaves the free surface of the fluidized bed until the propane is thoroughly burnt. It is essentially built upon a simple quasi-global mechanism for the combustion reaction and the mass and heat transfer equations from the two-phase model of fluidization. The aim was not to propose a new modelling approach, but to combine classical models, one concerning the reaction kinetics and the other the bed hydrodynamic aspects, to obtain a better insight on the events occurring inside a fluidized bed reactor, enhancing the understanding of this type of reactor. Experimental data to balance with the numerical model were obtained through tests on the combustion of commercial propane, in a laboratory scale fluidized bed, using four sand particle sizes: 400-500, 315-400, 250-315 and 200-250 μm. The mole fractions of CO 2 , CO and O 2 in the flue gases and the temperature of the fluidized bed were measured and compared with the numerical results. temperature of the slug ( Keywordstemperature of the slug at iteration n(temperature of the slug at iteration n − 1( bubble density (kg/m 3 ) ρ p sand particle density (kg/m 3 ) equivalence ratio (air/fuel) stoich /(air/fuel)

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“…The solid fuel is sent to the bed and is rapidly heated up to the bed operating temperatures, this provokes a strong devolatilization of the fuel particles and the majority of the volatiles burn above the free surface of the bubbling Copyright © 2013 SciRes. EPE C. PINHO 213 bed, while the charcoal solid core of the particle stays inside the bed while burning [22][23][24][25][26][27][28][29][30][31][32]. With this type of low temperature combustion (800˚C to 900˚C), low levels of NOx emissions are obtained.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Considerations about the Steady State Combustion of Wood Char in a Bubbling Fluidized Bed Reactor

Pinho¹

2013

EPE

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A theoretical study on the performance of steady state bubbling fluidized bed burners is presented using a simple mathematical model. The proposed model has pedagogical and practical advantages due to its simplicity. The calculations, whose results are plotted in several graphics, were based on data obtained in laboratory scale experiments. The experiments were carried out with wood chars and the model allows a proper evaluation of physical and chemical phenomena taking place inside the reactor, as well as a fast approach to the pre-design phase, before going towards more complex and time consuming numerical modeling. In the first part of the paper the steady state modeling is compared with the combustion of successive batches of char particles. Afterwards, the performance of a 1 m diameter bed operating from 700℃ to 800℃ is shown.

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Generic Behaviour of Propane Combustion in Fluidized Beds

Cited by 18 publications

References 5 publications

Determination of Fluidized Bed Combustion Kinetic and Diffusive Data of Four Wood Chars from the Central Region of Portugal

Determination of Fluidized Bed Combustion Kinetic and Diffusive Data of Four Wood Chars from the Central Region of Portugal

Combustion of slugs of propane and air moving up through an incipiently fluidized bed

Theoretical Considerations about the Steady State Combustion of Wood Char in a Bubbling Fluidized Bed Reactor

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