Last edited by Shahn
Thursday, August 6, 2020 | History

2 edition of numerical study of solid fuel combustion in a moving bed found in the catalog.

numerical study of solid fuel combustion in a moving bed

Daekwun Ko

numerical study of solid fuel combustion in a moving bed

by Daekwun Ko

  • 164 Want to read
  • 5 Currently reading

Published .
Written in English

    Subjects:
  • Coal -- Combustion -- Mathematical models.,
  • Coal-fired furnaces -- Mathematical models.

  • Edition Notes

    Statementby Daekwun Ko.
    The Physical Object
    Pagination141 leaves, bound. :
    Number of Pages141
    ID Numbers
    Open LibraryOL15204275M

    The application of incinerators for the municipal solid waste (MSW) is growing due to the ability of such instruments to produce energy and, more specifically, reduce waste volume. In this paper, a numerical simulation of the combustion process with the help of the computational fluid dynamics (CFD) inside a portable (mobile) incinerator has been proposed. Such work is done to investigate the. The furnace inlet has an axial stream of air carrying coal particles surrounded by a co-flow of swirling air. Such flow configurations are encountered in many practical solid-fuel combustion systems. Lagrangian approach is employed for tracking coal particles and Eulerian approach for solving gas phase.

    The in-depth understanding of the gas–solid flow and reaction behaviors, and their coupling characteristics during the chemical looping combustion (CLC) process has the guiding significance for the operation and optimization of a chemical looping combustor. A three-dimensional numerical model is applied to investigate the char-fueled CLC characteristics in a fuel reactor for efficient CO2. Baosheng Jin's research works with 3, citations and 5, reads, including: Experimental and kinetics investigations of separated-gasification chemical looping combustion of char with an.

    FUELS AND COMBUSTION. 1 Definition. Characteristics for good fuel. Calorific value. Gross or high calorific value (gcv) Net or lower calorific value(ncv) Theoretical calculation of calorific value (dulong‟s formula) 3 Solid fuel. Advantages of solid fuels. Disadvantages of solid fuels. 4 Coal. Proximate analysis. numerical modeling of the waste bed and WTE combustion process. Chapter 3 is a Discrete Element Method (DEM) numerical simulation applied to two different types of grate, comparing the flow and mixing of particles on these two traveling grate systems. Chapter 4 shows the modeling of chemically.


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Numerical study of solid fuel combustion in a moving bed by Daekwun Ko Download PDF EPUB FB2

The present study is a prelude to developing methods of analysis to obtain this improved understanding. A one-dimensional steady-state computational model for combustion of a bed of solid fuel particles with a counterflowing oxidant gas has been developed.

Air, with or without preheating, is supplied at the bottom of the : Daekwun Ko. Title: A Numerical Study of Solid Fuel Combustion in a Moving Bed Abstract approved. Murty Kanury Coal continues to be burned by direct combustion in packed or moving bed in small size domestic furnaces, medium size industrial furnaces, as well as small power stations.

Recent stringent restrictions on exhaust emissions call for a better. In this work, a simplified comprehensive three dimensional numerical model is used to study different biomass combustion process in a bubbling fluidized bed combustor including all necessary steps to define solid movement and conversion using CFD software AVL by: 1.

This condition not only means that the fuel packing on the bed is lower inducing less impedance on airflow but also results in a more sufficient oxidation for solid fuel combustion. From the fuel bed height change in Fig. 5 (a–c), the consumption of most of the fuel content completes earlier when the solid fuel is reduced by: 3.

Numerical simulation is an important method for studying the dense gas/solid reaction system in a fluidized bed. Fluidized bed oxy-fuel combustion is a complex system involving multiphase flow, mass transfer, and heat transfer coupled with a multiphase reaction.

Many aspects are difficult to study through physical by: 6. The modeling of the conversion of solid fuel in combustion or gasification systems needs a description of the composition of the volatile gases that leave a fuel particle of typical size in a fixed or fluidized bed during devolatilization.

Much work has been published on release of volatiles, but a general model of the composition of volatile gases and a comprehensive presentation of the.

systems. Figure gives the characteristic gas and solid fuel flow velocities, pres-sure losses and heat transfer coefficients of each of the combustion systems. In a grate firing system, the solid fuel lies in a bulk bed on a moving grate.

The fuel burns with the combustion air which is blown through the grate bars and through the bulk. Caillat, E. Vakkilainen, in Biomass Combustion Science, Technology and Engineering, Chemical composition. Solid fuel combustion comprises drying, evolution and burning of volatiles, and solid phase combustion.

Biochar combustion will produce, by fragmentation and melting, relatively large particles (micrometres to millimetres), which will form bottom ash and fly ash (approximately 1. of the work is devoted to development of a reliable numerical model of packed-bed com- bustion as it may help improve both results from simulations and knowledge of principles of solid fuel combustion in fixed or moving beds.

A one-dimensional transient numerical model of combustion in an experimental reactor. The combustion process is an exothermic chemical reaction, i.e., a reaction that releases energy as it occurs. Thus combustion may be represented symbolically by: Fuel + Oxidizer Products of combustion + Energy Here the fuel and the oxidizer are reactants.

The objective of this study is to evaluate experimentally and numerically the transport behaviour of a moving bed on a forward acting grate. Therefore, the grate was operated with expanded clay and wood chips without combustion. Frequency and amplitude of the grate bars and feed rate were subject to change.

Experimental findings showed that large particles have shorter residence times. The oxy-fuel combustion CFB technology as a promising carbon capture technologies needs to study the scale-up process for the commercial diffusion.

Numerical simulation would be a rational tool to investigate the gas-solid flow and oxy-fuel combustion process before constructing an expensive and complicated industry-scale plant. The ability to model the combustion of biofuels in a fixed bed is evaluated by a sensitivity analysis.

The analysis treats the uncertainty of model parameters related to heat transport, reaction rates, and composition of volatiles. The scatter of the parameters is estimated from the differences between several published correlations.

The results are compared with measurement data and possible. The bed particles act as a moving thermal energy accumulator and match the fluctuations in fuel properties. Therefore, the fluidized bed technology is the most widely used in combustion plants for the thermal treatment of problematic waste.

The main advantages of this combustion technology lie in its excellent mixing. In this paper, a coupled numerical model is developed to provide an advanced simulation for industrial scale grate boilers.

The detailed process of biomass conversion in the grate bed is captured using the developed one-dimensional fuel bed model, taking into consideration the separately controlled residence time and primary air supply in different zones.

19th Australasian Fluid Mechanics Conference Melbourne, Australia December Progress in Numerical Modelling of Packed Bed Biomass Combustion M. 1. Introduction. The oxy-fuel co-firing of coal and biomass in fluidized beds, which combines the CO 2 absorbed from the atmosphere during the growth of the biomass with CO 2 enrichment via oxy-fuel combustion, is considered a new, clean combustion technology that could be significant for the reduction of carbon emissions.

Tan et al. [1,2] called it carbon dioxide negative. Combustion of the particles in the bed plays a key role in the analysis of this kind of systems, and a stand-alone code was used in this work to provide the inlet conditions for the CFD analysis. Numerical study of the ignition front propagation of different pelletised biomass in a packed bed furnace.

Modeling of Solid and Bio-Fuel. Solid Fossil Fuel (Coal) Coal classifica tion, composition and basis ; Coal Mining; Coal preparation and washing; Combustion of coal and coke making ; Different types of coal combustion techniques ; Combustion of coal and coke making ; Coal liquefaction; Coal Li quefaction (Contd.) Coal Gasification; Liquid Fossi l Fuel (Petroleum) Exploration.

burners. The fuel is introduced into the combustion chamber from the side (with or without a grate). During combustion the fuel is moved or pushed horizontally from the feeding zone to the other side of the pusher plate or the grate.

On its way to drying, gasification and solid combustion take place. The remaining ash drops into an ash container. The dynamics of gaseous/solid-fuel combustion zones caused by the hot air and oxygen enrichment would contribute to an expansion of melting zone near the inlet, producing a more reasonable and uniform heat distribution in a sintering bed.preparation of fuels, Principles of Combustion, Combustion of Oil, Coal, and Gas This chapter is a prelude to boilers and furnaces Introduction to Fuels The various types of fuels like liquid, solid and gaseous fuels are available for firing in boilers, furnaces and other combustion equipments.

The selection of right type of fuel depends.biomass combustion on a forward acting grate using XDEM, Chemical Engineering Science,pp. 32{41, [7] A. H. Mahmoudi, M. Markovic, B. Peters and G.

Brem, An experimental and numerical study of wood combustion in a xed bed using EulerLagrange approach (XDEM), Fuel,pp. .