Ash effects during combustion of lignite/biomass blends in fluidized bed

Vamvuka, Despina; Pitharoulis, M.; Alevizos, George; Repouskou, Eftychia; Pentari, Despina

doi:10.1016/j.renene.2009.05.005

Cited by 80 publications

(23 citation statements)

References 32 publications

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“…In this context, the use of biomass in countries where it is abundant represents a route to reduce the dependency on oil from foreign sources utilizing domestic resources instead. Among the different conversion techniques, thermochemical conversion of biomass via gasification is seen as highly promising [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of olivine as a bed material in an indirect biomass gasifier

Marinković

Thunman

Knutsson

et al. 2015

Chemical Engineering Journal

116

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Section: Introductionmentioning

confidence: 99%

Characteristics of olivine as a bed material in an indirect biomass gasifier

Marinković

Thunman

Knutsson

et al. 2015

Chemical Engineering Journal

116

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“…base-to-acid ratio (B/A), silica-alumina ratio (S/A), iron-calcium ratio (I/C), total alkali (TA), 그리고 bed agglomeration index (BAI)가 있다 [12,13]. 본 인자들의 정의는 아래 Equation (3) ~ (7)과 같이 정의되어 있으며, 각각의 인자들에 대한 평가 지 표는 Table 5와 같다.…”

Section: 회분의 거동 및 퇴적의 경향은 바이오매스의 회분에 대한 경험적 인자를 바탕으로 예측되었다 이들의 대표 인자에는unclassified

Experimental Study of Co-firing and Emission Characteristics Fueled by Sewage Sludge and Wood Pellet in Bubbling Fluidized Bed

Lee¹,

Kim²,

Kim³

et al. 2017

Clean Technology

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:The bubbling fluidized bed (BFB) reactor with a diameter of 0.1 m and a height of 1.2 m was used for experimental study of co-firing and emission characteristics fueled by sewage sludge (SS) and wood pellet (WP). The facility consists of a fluidized bed reactor, feeding system, cyclone, condenser and gas analyzer, The mean particle diameter and minimum fluidization velocity are 460 µm and 0.21 m s -1 respectively. SS produced from Korea and WP from Canada were examined. The various mixing ratios of WP were 20, 50, and 80% based on HHV. The equivalence ratio of 1.65, reactor temperature of 800 ℃, air flow rate of 100 L min -1 , and fluidization number of 4 were fixed in the BFB experiment. In TGA, the range of combustion temperature of SS was wider than that of WP. It represents that the combustibility of WP is higher than that of SS. The BFB reactor temperature was maintained between 800 and 900 ℃. CO emission of SS was high because of lower combustibility. NOX and SOX formation of SS were higher than that of WP since high nitrogen and sulfur contents of SS. CO, NOX, and SOX formation were suppressed as the mixing ratio of WP was increased. The slagging and fouling tendencies show high in all test conditions.

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“…The techniques that have been used previously for estimation of agglomeration propensity, such as initial deformation temperature measurement (IDT) using AFT [25] and base to acid ratio calculation [26] have been applied using only the bulk coal composition. However, Van Dyk et al [27] found on comparison to high temperature X-ray diffraction (HT-XRD) and FactSage ™ modeling results that a liquid phase was detected at temperatures below those predicted by AFT.…”

Section: Heterogeneity In Ash Chemical Compositionmentioning

confidence: 99%

Effect of Heterogeneity in Coal Ash Chemical Composition on the Onset of Conditions Favorable for Agglomeration in Fluid Beds

2015

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Ash agglomeration issues that arise due to the sticking of slag-wetted, colliding particles have been creating operational difficulties and monetary losses for the fluidized bed combustion (FBC) industry. Difficulties have been experienced in the detection of slag-liquid at the low operating temperatures in fluidized bed combustors (FBCs) and predicting the agglomeration behavior of fuel. This study aims to study the effect of heterogeneity in ash composition on the detection of slag-liquid in FBCs. It quantifies the slag-liquid amounts at the particle-level, under oxidizing environments, by dividing the bulk fuel into density classes. FactSage ™ thermodynamic simulations of each of the particle classes, along with experimental validation of the trends with thermo-mechanical analysis (TMA) and high temperature X-ray diffraction (HT-XRD) were performed. The results obtained can be used to estimate the stickiness of particles in the development of ash agglomeration models based on particle collisions. The study of these particle classes shows that particle classes with specific minerals can form low temperature eutectics and lead to onset of slag-liquid formation at temperatures below those predicted by bulk analysis alone. Comparison of the differences in slag-liquid formation tendencies under reducing and oxidizing environments is also presented.

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Ash effects during combustion of lignite/biomass blends in fluidized bed

Cited by 80 publications

References 32 publications

Characteristics of olivine as a bed material in an indirect biomass gasifier

Characteristics of olivine as a bed material in an indirect biomass gasifier

Experimental Study of Co-firing and Emission Characteristics Fueled by Sewage Sludge and Wood Pellet in Bubbling Fluidized Bed

Effect of Heterogeneity in Coal Ash Chemical Composition on the Onset of Conditions Favorable for Agglomeration in Fluid Beds

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