Combustion of coal in circulating fluidized-bed boilers: a review

Basu, Prabir

doi:10.1016/s0009-2509(99)00285-7

Cited by 289 publications

(151 citation statements)

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“…The results obtained clearly indicated the mechanical changes of the coal during its combustion, particularly at the moment of ignition of the char. Moreover, the results correlate very well with the processes of coal comminution that have been described by other authors (Basu, 1999;Chirone et al, 1991) during combustion in the circulating fluidized bed and also explain the sudden change of susceptibility to erosion in the conditions with and without combustion. The measured values can be used as strength parameters in the modelling of the mass loss of coal particles in conditions of circulating fluidized bed combustor that are hard to describe.…”

supporting

confidence: 89%

“…Otrzymane rezultaty wskazują na bardzo wyraźne zmiany wytrzymałościowe węgla podczas jego spalania, szczególnie w chwili zapłonu karbonizatu. Uzyskane wyniki bardzo dobrze korelują z opisywanymi przez innych autorów procesami rozdrabniania węgla (Basu, 1999;Chirone et al, 1991) podczas spalania w warunkach cyrkulacyjnej warstwy fluidalnej. Tłumaczą gwałtowną zmianę podatności na erozję w warunkach bez spalania oraz z towarzyszącym spalaniem.…”

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Evolution of the Structure and Mechanical Strength of a Coal Particle During Combustion in the Atmosphere of Air and the Mixture of Oxygen and Carbon Dioxide / Ewolucja Struktury Oraz Wytrzymałości Mechanicznej Ziarna Węgla Podczas Spalania W Atmosferze Powietrza Oraz Mieszaninie Tlenu I Dwutlenku Węgla

Pełka¹,

Golański²,

Wieczorek³

2013

Archives of Mining Sciences

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The research was conducted on the basis of four different types of hard coal and one type of brown coal. There are typical coals commonly used as fuel in Polish CFB boilers. The combustion process was conducted at a temperature of 850°C and the atmosphere of ambient air as well as in the mixture of oxygen and carbon dioxide in different proportions. The research was carried out using specially prepared cubical coal particles with measurements of 15×15mm and also 10×10 mm. The change of the mechanical properties was analyzed based on three parameters, i.e. compression strength, Vickers hardness and fracture toughness. The analysis was supplemented by microscopic images of the surface of the particles using an atomic force microscope. The results obtained clearly indicated the mechanical changes of the coal during its combustion, particularly at the moment of ignition of the char. Moreover, the results correlate very well with the processes of coal comminution that have been described by other authors (Basu, 1999;Chirone et al., 1991) during combustion in the circulating fluidized bed and also explain the sudden change of susceptibility to erosion in the conditions with and without combustion. The measured values can be used as strength parameters in the modelling of the mass loss of coal particles in conditions of circulating fluidized bed combustor that are hard to describe. Keywords: combustion, comminution, mechanical propertiesBadania przeprowadzono na podstawie czterech węgli kamiennych różnego typu oraz jednego węgla brunatnego. Są to typowe węgle energetyczne wykorzystywane powszechnie jako paliwo w kotłach fluidyzacyjnych w Polsce. Proces spalania był prowadzony w temperaturze 850°C w atmosferze powietrza atmosferycznego oraz w atmosferze mieszaniny tlenu oraz dwutlenku węgla w różnych proporcjach. Badania przeprowadzono na spreparowanych do tego celu sześciennych próbkach węgla o wymiarach 15×15 mm oraz 10×10 mm. Zmianę własności mechanicznych przeanalizowano w oparciu

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confidence: 89%

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Evolution of the Structure and Mechanical Strength of a Coal Particle During Combustion in the Atmosphere of Air and the Mixture of Oxygen and Carbon Dioxide / Ewolucja Struktury Oraz Wytrzymałości Mechanicznej Ziarna Węgla Podczas Spalania W Atmosferze Powietrza Oraz Mieszaninie Tlenu I Dwutlenku Węgla

Pełka¹,

Golański²,

Wieczorek³

2013

Archives of Mining Sciences

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“…The other section is known as convective section. The major advantages of these boilers are fuel flexibility, high combustion efficiency, efficient sulfur removal and low NO x emmission [20,21]. Leckner investigated that if we are using wood as a fuel there is a production of large amount of nitrogen oxide.…”

Section: Boiler (Afbc) Pressurized Fluidized Bed Combustion Boiler (mentioning

confidence: 99%

An overview of problems and solutions for components subjected to fireside of boilers

et al. 2017

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In engineering applications, there are various types of boilers such as water tube boilers, fire tube boilers, packaged boiler, fluidized bed combustion boiler, pulverized fuel boiler and waste heat boilers. These boilers are used in different industries such as power plants, paper, and chemical. The present paper reports various problems (such as agglomeration, slagging, fouling, caustic embrittlement, fatigue failure and high temperature corrosion) related to boilers and their possible solutions. Some of the controlling parameters for high temperature corrosion has also been studied viz use of inhibitors, varying temperature and pressure, sol-gel coating and thermal spray coating. Thermal spraying has emerged as a main tool for improvement in surface. Problem of corrosion, wear resistance, electrical or thermal insulation can be altered using different coating techniques and materials. Deposition of ash in biomass-fired boilers also causes severe problems of agglomeration. The problem of agglomeration can be solved using kaolin or NH 3 in the bed of boilers. Some important processes such as pulse detonation wave technology, intelligent soot blower, chemical treatment technology can be used to minimize the effects of fouling.

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“…1). Thus, the fuel combustion becomes the cyclic process, comprising a repeated heating, ignition, combustion, extinction and cooling (Grace et al, 1997;Basu, 1999).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Coal With Coal-Mule and Biomass Co-Combustion in Slurry Form/Analiza Współspalania Węgla Z Mułem Węglowym I Biomasą W Postaci Zawiesiny

Kijo-Kleczkowska¹

2014

Archives of Mining Sciences

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Combustion technology of coal-water fuels creates a number of new possibilities to organize the combustion process fulfilling contemporary requirements e. g in the environment protection. Therefore an in-depth analysis is necessary to examine the technical application of coal as energy fuel in the form of suspension. The paper undertakes the complex research of the coal with coal-mule and biomass cocombustion. The mathematical model enables the prognosis for change of the surface and the centre temperatures and a mass loss of the fuel during combustion in air and in the fluidized bed.

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Combustion of coal in circulating fluidized-bed boilers: a review

Cited by 289 publications

References 0 publications

An overview of problems and solutions for components subjected to fireside of boilers

Analysis of Coal With Coal-Mule and Biomass Co-Combustion in Slurry Form/Analiza Współspalania Węgla Z Mułem Węglowym I Biomasą W Postaci Zawiesiny

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