Design of solid biofuels blends to minimize the risk of sintering in biomass boilers

Rodríguez, Juan Luis Rodríguez; Álvarez, Xana; Valero, Enrique; Ortiz, Luis; Torre-Rodríguez, Natalia de la; Acuña-Alonso, Carolina

doi:10.1016/j.joei.2020.07.015

Cited by 10 publications

(13 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The proportion of CaO ranged from 25.5 to 41%, with a coefficient of variation close to 19% and with no significant differences between clones. These values are lower than those obtained for ashed samples of Eucalyptus containing bark or pruning remains from urban gardens [9,10]. A study by Girón, et al [34] reported an average of 55% CaO in the fly ash of Eucalyptus bark.…”

Section: Chemical Composition Of Ashmentioning

confidence: 79%

“…In addition, the hardness index (denoted HI) proposed by Rodríguez, et al [9] and Rodríguez, et al [10] was applied by considering the ratio of ash and slag >1 mm at two power levels (P6 and P3) and by also applying a multiplicative coefficient of hardness (the coefficient equals 0.5 when the slag has a soft texture and 2 when it has a hard texture).…”

Section: Experimental Bed Agglomeration Indicesmentioning

confidence: 99%

“…The work of Monedero, et al [7] applied two indices, i.e., the ratio between alkaline metal oxides and silica (K 2 O + Na 2 O/SiO 2 ) and the ratio between alkaline metal oxides and the higher heating value (alkali index), to 10 clones and predicted a low risk of fouling, although no experimental evidence was provided. Recently, two indices characterizing the experimental tendency for bed agglomeration have been evaluated: the Bioslag test and the hardness index [8,9]. These indices are based on the granulometry and hardness of the ash deposits obtained by complete combustion [10].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Growing Poplar in Acid Soils: Biomass Yield and Ash Behavior

Eimil‐Fraga

Oliveira

Torres

et al. 2021

Forests

View full text Add to dashboard Cite

Atlantic areas of southern Europe have low water restrictions but are also characterized by acid soils with low intrinsic fertility, so the selection of clones that have adapted to these characteristics is essential. In this study, biomass yield data for eight poplar clones established in two trials were evaluated after the first rotation. Both sites were representative of acid soils that had previously been used for agriculture and had low levels of alkali and alkaline earth elements. The first trial was used to determine which clones performed the best in terms of biomass and stem size, testing two Populus × euramericana (Dode) Guinier (I-214 and AF2), two P. × interamericana Van Brokehuizen × P. nigra L. (Monviso, AF6), three P. × interamericana (Unal, Beaupre and Raspalje), and one P. trichocarpa Torr & A. Gray (Trichobel) clone. The second trial explored the possibility of simultaneously growing biomass and timber, specifically considering the Raspalje and Trichobel balsam poplar clones. To complete a previous study on energy properties, nine biomass samples were obtained from each of the eight clones to evaluate the composition and behavior of the ash generated during combustion, particularly the sintering risk. Several indices of sintering risk were explored and compared with the actual sintering using the BioSlag test. The results show large differences in biomass yield between clones, with the balsam poplar derived clones (both hybrid or pure Populus trichocarpa) performing the best. Growth results for stems planted for wood and the cuttings planted in between these stems show that a mixed biomass–timber arrangement provides good results, at least during the first rotation. The relative proportion of oxides in the poplar ash followed the order CaO > K2O > MgO >> P2O5 >> SiO2 > Al2O3 > Na2O > Fe2O5 >> TiO2. Significant differences between clones were found for K2O and MgO. Risk indices showed moderate levels of sintering derived from alkali elements, with significant differences between clones. The actual slagging and the hardness of the slag particles were very low thus, denoting good ash behavior during combustion, particularly for the clones selected for biomass yield. No significant covariate effect of basal diameter was found for any of the analyzed variables. We conclude that growing site-undemanding poplar clones in acid soils can yield both reasonable levels of biomass yield and good quality chips for combustion in domestic thermal systems.

show abstract

Section: Chemical Composition Of Ashmentioning

confidence: 79%

Section: Experimental Bed Agglomeration Indicesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Growing Poplar in Acid Soils: Biomass Yield and Ash Behavior

Eimil‐Fraga

Oliveira

Torres

et al. 2021

Forests

View full text Add to dashboard Cite

show abstract

“…Phosphorous based additives, such as NH4H2PO4 in the work of Wang et al [18], successfully decreased slag formation, but at the same decreased the integrated combustion characteristic index and their efficiency depended on the inorganic composition of the fuel that they were added to. On the other hand, biomass mixing proved to be a more suitable solution than additives to fight slagging and agglomeration in terms of cost and effectiveness [19] and triggered the interest of many researchers during the last thirty years [6,[20][21][22][23][24]. Mixing biomasses with different ash contents and compositions at various ratios modifies the chemical composition and physical properties of the feedstock.…”

Section: Introductionmentioning

confidence: 99%

Will mixing rule or chemical reactions dominate the ash behavior of biomass mixtures in combustion processes on laboratory and pilot scales?

Atallah

Defoort²,

Campargue³

et al. 2022

Fuel

View full text Add to dashboard Cite

“…However, wood waste can be considered as a valuable resource (Lykidis and Grigoriou, 2008). To satisfy the increase of energy dependence and reduced demand of fossil fuels, several studies have shown how biomass waste can be used as feedstock for combustion (Lu et al, 2017;Rodríguez et al, 2020), as potential source of food for insects (Varelas and Langton, 2017), and to extract and use tannins to produce leather (Pizzi, 2019).…”

Section: Introductionmentioning

confidence: 99%