Agglomeration in bio-fuel fired fluidized bed combustors

Lin, Weigang; Dam‐Johansen, Kim; Frandsen, Flemming

doi:10.1016/j.cej.2003.08.008

Cited by 250 publications

(161 citation statements)

References 34 publications

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“…5f shows that unlike other biomass ashes, there was an endothermic peak around 650 °C, and this endothermic peak was mainly due to the melting of KCl because CCA contains a large amount of KCl in the form of sylvite. Other studies (Nielsen et al 2000;Lin et al 2003) suggest that the intense volatilization of alkali chlorides mainly occurs between 750 and 950 °C.…”

Section: Thermal Properties Analysismentioning

confidence: 99%

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

Yao

Yan

et al. 2017

BioResources

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Three typical biomass fuels-rice husk, rice straw, and corn cobs-were combusted to understand the effects of ashing temperature on ash fouling and slagging characteristics. The ashes generated from combustion at 600 °C and 815 °C were characterized thoroughly with regard to their chemical composition. The systematic slagging/fouling indices of biomass were used to study the effects of ashing temperature on ash fouling and slagging propensities. The results showed that ashing temperature had a remarkable influence on ash composition, particle size distribution, ash morphology, ash fusibility, and thermal properties. Increased ashing temperature resulted in the expansion of ash particles together with the volatilization of alkali metals in the form of inorganic salts. Morphology analysis indicated that high ashing temperatures promoted biomass ash slagging. Ash fusion points increased at elevated ashing temperatures, while the ash content decreased. As a result of the volatilization and decomposition of biomass ash, a four-step mechanism of weight loss was clearly identified by thermal analysis. All prepared biomass ashes resulted in slagging and fouling problems at different levels during the thermochemical conversion of biomass.

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Section: Thermal Properties Analysismentioning

confidence: 99%

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

Yao

Yan

et al. 2017

BioResources

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“…The main alkali compound evaporating in RSA was KCl. Considering previous research (Nielsen et al 2000;Lin et al 2003), this study found that the intense volatilization of alkali chloride (Eq. 1) occurred at 600 °C RSA when the ashing temperature increased from 600 to 815 °C.…”

Section: Mineral Phase Analysismentioning

confidence: 99%

Comparative Analysis of the Physical and Chemical Properties of Different Biomass Ashes Produced from Various Combustion Conditions

Yao¹,

Xu²,

Liang³

2017

BioResources

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The ash yield, composition, mineral phases, and other physical and chemical properties of various biomass ashes are dependent on ashing temperature. To fully understand the impacts of biomass species and ashing temperature on the characterization of biomass ashes, three kinds of biomass fuels were treated at different ashing temperatures to produce biomass ashes. Their properties were analyzed by a series of qualitative and quantitative methods, including X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), thermal gravimetric, and differential thermal analyzer (TG-DTA). The experimental results indicated that as the ashing temperature was raised, the ash slagging tendency could be enhanced. The fused layer on the surface of ash particles was coated with potassium chloride, which was the key reason for the development of severe agglomeration and slagging. Due to the high carbon content and large number of pores in the lower temperature ashes, a low-cost adsorbent could be developed effectively from these carbon materials. The thermal decomposition of all ashes showed a stepwise mechanism. The total weight loss of the same biomass ash decreased with increased ashing temperature, which corresponded well with the phase transitions and thermal reaction sequences.

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“…Several studies have been conducted on the combustion of biomass waste materials in fluidized bed combustors in energy production. The researches mainly focused on the combustion of varies agricultural residue biomass types: rice husk [8]- [13], rice straw and wheat straw [14]- [16], palm kernel shell [17], sunflower shell [18], peanut shell [19], cotton stalk [20], and cedar pellet. The fluidized bed combustion was also used to burn woody biomass feed stocks, such as sawdust [21]- [23] and wood [15], [24]- [26].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Axial Temperature Distribution of Combustion of Dewatered Poultry Sludge in Fluidized bed combustor

Abbas

Sulaiman

Aris

2016

MATEC Web of Conferences

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Abstract.A laboratory scale bubbling fluidized bed combustor was designed and fabricated to study the combustion of dewatered poultry sludge at different operational parameters. This paper present a study on the influence of equivalent ratio, secondary to primary air ratio and the fuel feed rate on the temperature distribution along the combustor. The equivalent ratio has been changed between 0.8 to 1.4% under poultry sludge feed rate of 10 kg/h and from 0.8 to 1 under poultry sludge feed rate of 15 kg/h. The secondary to primary air ratio was varied from 0.1 to 0.5 at 0.65 m injection height and 1.25 equivalent ratio. The results showed that these factors had a significant influence on the combustion characteristics of poultry sludge. The temperature distribution along the combustor was found to be strongly dependent on the fuel feed rate and the equivalent ratio and it increased when these two factors increased. However, the secondary air ratio increased the temperature in the lower region of the combustor while no significant effect was observed at the upper region of the combustor. The results suggested that the poultry sludge can be used as a fuel with high thermal combustor efficiency.

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Agglomeration in bio-fuel fired fluidized bed combustors

Cited by 250 publications

References 34 publications

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

Comparative Analysis of the Physical and Chemical Properties of Different Biomass Ashes Produced from Various Combustion Conditions

An Experimental Study on Axial Temperature Distribution of Combustion of Dewatered Poultry Sludge in Fluidized bed combustor

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