Fouling tendency of ash resulting from burning mixtures of biofuels. Part 3. Influence of probe surface temperature

Theis, Mischa; Skrifvars, Bengt-Johan; Zevenhoven, Maria; Hupa, Mikko; Tran, Honghi

doi:10.1016/j.fuel.2005.12.011

Cited by 51 publications

(32 citation statements)

References 17 publications

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“…The surface temperatures of deposition probe can thus be monitored or controlled to some extent via adjusting the flow rate of cooling air depending on flue gas temperature and the probe properties (i.e., size, metal conductivity). In most of deposit-related studies, the surface temperature of ash deposition probes was controlled at the steam-tube metal temperature in boilers, typically at 430-600 °C [10,12,30,31,[42][43][44][45]. On the other hand, ash deposit sampling was performed at the superheater zone in a small boiler furnace or multiple locations in a large scale unit using the air-cooled deposition probes.…”

Section: Ash Deposition Monitoring and Analysis Of Ash Depositsmentioning

confidence: 99%

“…Research efforts have been put into attempting to understand the mechanisms involved in the formation [15,44,48,55,56], slagging/fouling [52] and corrosion [35] of the ash deposits during biomass combustion or co-firing. During combustion processes, ash is formed from the fuel-bound inorganic materials through a combination of complex chemical and physical processes.…”

Section: Mechanisms and Chemistry Of Ash Depositionmentioning

confidence: 99%

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Ash Deposition in Biomass Combustion or Co-Firing for Power/Heat Generation

et al. 2012

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This paper presents a concise overview of ash deposition in combustion or co-firing of biomass (woody biomass, agricultural residues, peat, etc.) with other fuels for power/heat generation. In this article, the following five research aspects on biomass combustion ash deposition are reviewed and discussed: influence of biomass fuel characteristics, deposit-related challenges, ash deposition monitoring and analysis of ash deposits, mechanisms and chemistry of fly ash deposition, and key technologies for reducing ash deposition and corrosion in biomass-involved combustion.

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Section: Ash Deposition Monitoring and Analysis Of Ash Depositsmentioning

confidence: 99%

Section: Mechanisms and Chemistry Of Ash Depositionmentioning

confidence: 99%

Ash Deposition in Biomass Combustion or Co-Firing for Power/Heat Generation

et al. 2012

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“…Many studies have focused on the difference in mineral content between different fuel types usually in relation to heat and power generation (e.g. Misra et al, 1993;Etiégni and Campbell, 1991;Liodakis et al, 2005;Steenari, 1995;Heikkinen et al, 1998;Theis et al, 2006;Steenari et al, 1999;Frederiksson, 1996;Ryssen and Ndlovu, 2004;Sweeten et al, 2003;Miller and Miller, 2007;Genin et al, 2007). The results indicate that wood ash is comprised mainly of calcium, magnesium and potassium.…”

Section: Ashmentioning

confidence: 99%

Fuel, Fire and Heat: an experimental approach to highlight the potential of studying ash and char remains from archaeological contexts

Braadbaart¹,

Poole²,

Huisman³

et al. 2012

Journal of Archaeological Science

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“…Theis et al [20] used an air-cooled probe at various probe surface temperatures between 475 and 625 °C to collect ash deposits from burning mixtures of peat with bark and peat with straw in an entrained flow reactor. The results showed that the probe surface temperature had no effect on the deposition rate when burning pure peat; however, when burning bark, either alone or blended with peat, the deposition rate decreased as the probe surface temperature increased.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of alkali species release from a burning coal/biomass blend

Liu

Wang

et al. 2018

Applied Energy

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Solvent fractionation, Laser induced breakdown spectroscopy (LIBS), X-ray Diffraction (XRD) and chemical analysis were applied to binary fuel mixtures of Zhundong coal and cornstalk agricultural class to investigate the release characteristics of alkali species during co-firing of coal and biomass. As the biomass proportion increases, the water-soluble, NH4Ac-soluble and HCl-soluble alkali species interconvert; the extent of the conversion depends on the composition of the blend. From LIBS measurements, it was found that adding the biomass accelerates combustion and outgassing processes.The higher the proportion of the biomass in the blend, the earlier the peak concentrations of alkali appear, and the magnitude of peak concentrations of sodium and potassium decrease and increase, respectively. Furthermore, the interaction between coal and biomass can generate crystals causing the eutectic melting phenomenon (similar to feldspar in XRD results), which results in a sharp decline of the ash fusion temperatures (AFTs). The results not only provide the information of fundamental transformation but also guide industrial co-firing applications of lignite and agricultural class biomass to reduce the risk of ash deposition.

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Fouling tendency of ash resulting from burning mixtures of biofuels. Part 3. Influence of probe surface temperature

Cited by 51 publications

References 17 publications

Ash Deposition in Biomass Combustion or Co-Firing for Power/Heat Generation

Ash Deposition in Biomass Combustion or Co-Firing for Power/Heat Generation

Fuel, Fire and Heat: an experimental approach to highlight the potential of studying ash and char remains from archaeological contexts

Characteristics of alkali species release from a burning coal/biomass blend

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