Forest biomass waste combustion in a pilot-scale bubbling fluidised bed combustor

Tarelho, Luís António da Cruz; Neves, Darlene M.; Matos, Manuel Arlindo Amador de

doi:10.1016/j.biombioe.2010.12.052

Cited by 65 publications

(27 citation statements)

References 49 publications

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“…Thus, the observed temperature peak was mainly due to the intense combustion of volatiles near the burner. Tarelho et al (2011) andAl-Widyan et al (2006) have reported similar results.…”

Section: Effect Of Coal Blend Ratio On Combustion Temperature and Comsupporting

confidence: 75%

Co-Firing Ramie Residue with Supplementary Coal in a Cyclone Furnace

et al. 2012

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a Co-firing ramie residue with coal was carried out in a thermogravimetric analyzer and a cyclone furnace to evaluate the effects of coal fraction (0 to 30 wt. %) on combustion performance. Thermogravimetric analysis (TGA) results showed that devolatilisation was the predominant process when the coal percentage in the blend was below 30 wt. %. For pure biomass firing in the cyclone furnace, an optimum equivalence ratio (ER =1.16) was found. Coal additions (0 to 30 wt. %) led to less slagging/fouling problems, higher combustion temperature and higher combustion efficiency along with low pollutant emissions, while the improvement in combustion temperature was weakened as the coal blend ratio exceeded 20 wt.%. The maximum temperature in the cyclone furnace increased from 1215 to 1319°C as the coal fraction increased from 0 to 30 wt.%.

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“…Thus, the observed temperature peak was mainly due to the intense combustion of volatiles near the burner. Tarelho et al (2011) andAl-Widyan et al (2006) have reported similar results.…”

Section: Effect Of Coal Blend Ratio On Combustion Temperature and Comsupporting

confidence: 75%

Co-Firing Ramie Residue with Supplementary Coal in a Cyclone Furnace

et al. 2012

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“…4−6 FBC has been selected in several combustion trials utilizing poultry litter, 7−9 and it is used commercially for the combustion of low-quality fossil fuels, such as peat, 10 and the co-combustion of biomass fuels. 11,12 However, the variable mineral content of biomass can give rise to operational problems including slagging, fouling, and possible corrosion during combustion applications.…”

Section: ■ Introductionmentioning

confidence: 99%

Ash Agglomeration and Deposition during Combustion of Poultry Litter in a Bubbling Fluidized-Bed Combustor

et al. 2013

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In this study, we have characterized the ash resulting from fluidized bed combustion of poultry litter as being dominated by a coarse fraction of crystalline ash composed of alkali-Ca-phosphates and a fine fraction of particulate K 2 SO 4 and KCl. Bed agglomeration was found to be coating-induced with two distinct layers present. The inner layer (0.05−0.09 mm thick) was formed due to the reaction of gaseous potassium with the sand (SiO 2 ) surface forming K-silicates with low melting points. Further chemical reaction on the surface of the bed material strengthened the coating forming a molten glassy phase. The outer layer was composed of loosely bound, fine particulate ash originating from the char. Thermodynamic equilibrium calculations showed slag formation in the combustion zone is highly temperature-dependent, with slag formation predicted to increase from 1.8 kg at 600°C to 7.35 kg at 1000°C per hour of operation (5.21 kg of ash). Of this slag phase, SiO 2 and K 2 O were the dominant phases, accounting for almost 95%, highlighting the role of K-silicates in initiating bed agglomeration. The remaining 5% was predicted to consist mainly of Al 2 O 3 , K 2 SO 4 , and Na 2 O. Deposition downstream in the low-temperature regions was found to occur mostly through the vaporization−condensation mechanism, with equilibrium decreasing significantly with decreasing temperatures. The dominant alkali chloride-containing gas predicted to form in the combustion zone was KCl, which corresponds with the high KCl content in the fine baghouse ash.

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“…Many studies have found that the N2O content in fluidized bed combustion is low and is difficult to measure (Tarelho et al 2011), and hence, this was not included in the flue gas analysis.…”

Section: Procedures and Parametersmentioning

confidence: 99%

Study on NO Emission in the Oxy-Fuel Combustion of Co-Firing Coal and Biomass in a Bubbling Fluidized Bed Combustor

Zan

et al. 2017

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Combustion experiments were performed in a bubbling bed combustor to explore the effects of various oxygen concentrations (21% to 40%), temperatures (850 °C to 950 °C), and mixing ratios (0% to 30%) on the formation of NO gas. In order to correspond to different combustion stages, the generated NO were distinguished as volatile-NO and coke-NO, respectively, and the total amount and the conversion rate of NO were analyzed. The results indicated that NO comes mainly from fixed carbon combustion, and an increased oxygen concentration in the environment could produce more NO during the combustion process, regardless of the blending of biomass. The temperature increase promoted the conversion of nitrogen in the anthracite and accelerated the release of volatiles from the pine powder. During mixed combustion with increasing temperature, the volatiles formed had diluted the environmental oxygen concentration, which led to suppressed NO emissions. In addition, increasing the blending ratio also resulted in decreased NO emissions due to the large amount of intermediates released by the burning pine powder that induced a deoxidation effect on the NO emission.

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Forest biomass waste combustion in a pilot-scale bubbling fluidised bed combustor

Cited by 65 publications

References 49 publications

Co-Firing Ramie Residue with Supplementary Coal in a Cyclone Furnace

Co-Firing Ramie Residue with Supplementary Coal in a Cyclone Furnace

Ash Agglomeration and Deposition during Combustion of Poultry Litter in a Bubbling Fluidized-Bed Combustor

Study on NO Emission in the Oxy-Fuel Combustion of Co-Firing Coal and Biomass in a Bubbling Fluidized Bed Combustor

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