Investigation on Blended Ash Fusibility Characteristics of Biomass and Coal with High Silica–Alumina

Ma, Xiuwei; Li, Fenghai; Ma, Mingjie; Fang, Yitian

doi:10.1021/acs.energyfuels.7b01070

Cited by 51 publications

(26 citation statements)

References 43 publications

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“…Therefore, it is reasonable to predict the AFC by mineral species and their contents at a given temperature. To investigate the AFT variation mechanism of the HS mixture blended with manures, the 1100 °C mixed HS ash samples with different mass ratio CMs or SMs (0, 10, 30, 50, 70, and 90%) prepared in the AFT analyzer were performed on the XRD (at this temperature, the mineral species and its content in ash samples were moderate, which could give an expression to the AFT change. , Moreover, the DTs of all HS mixtures were above 1100 °C, and the prepared ash samples was easy to take out from the porcelain boat.). The XRD patterns of HS mixed ashes at 1100 °C are shown in Figure , and their mineral composition based on the RIR method are given in Table .…”

Section: Resultsmentioning

confidence: 99%

“…The ashing temperature affects the biomass ash composition and its properties, 26 and a 500−600 °C ashing temperature can reflect its ash chemical composition because of the low volatility of Na and K. 27,28 Because of their cogasification conditions, laboratory ash of the four samples was prepared according to the American Society for Testing and Materials (ASTM, E1755-01) standard in a muffle furnace (SX2-8-16ASP, Kewei Co., Beijing, China). This procedure has been described in detail (to guarantee that the organic matter in coal burned completely, the samples were kept at 575 °C for 8 h. 28 ). 29 The mixed ash samples were prepared by adding CM or SM ash into YM or HS ash at a certain mass ratio (0−100% with a 10% interval), respectively.…”

Section: Methodsmentioning

confidence: 99%

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Investigation on Ash-Fusion Characteristics of Livestock Manure and Low-Rank Coals

Zhao

Fan

et al. 2020

Energy Fuels

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Large amounts of livestock manure are produced annually, and cogasification offers a promising method for large-scale and clean use of manure. To investigate the ash-fusion characteristics (AFC) of livestock manure and coal, and their variation mechanisms, the AFCs of two coals (Yima long-flame coal and Husheng lignite), two manures (cattle manure (CM), and swine manure (SM)), and their mixtures were explored. An increase in the ash mass ratio of the CM or SM increased the sintering temperature (T s) of two mixed coal ashes (the SM enhanced the T s more than that of the CM); however, their ash-fusion temperature (AFT) decreased first and then increased (the turning points for the Yima long-flame coal ash mixture were CM: ∼60% and SM: ∼40%, and those for the Husheng lignite were SM: ∼70% and SM: ∼50%). The T s was induced by partial particle surface fusion, and was related to the formation of a low melting eutectic (e.g., binary systems for K2SiO3–Na2Si2O5 and Na2S–FeS) and their contents. The AFT indicated that the bulk melting property was determined mainly by ash composition, especially for a basic/acid ratio. The disappearance of mullite and the formation of high melting-point phosphates (e.g., KCaPO4, K2CaP2O7, and Ca2.71Mg0.27(PO4)2) resulted in AFT fluctuations of the mixtures.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Investigation on Ash-Fusion Characteristics of Livestock Manure and Low-Rank Coals

Zhao

Fan

et al. 2020

Energy Fuels

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“…The ash FT is generally considered to be one of the key factors in determining the slag flow behavior . Typical operating temperatures for prevailing entrained‐flow slagging gasifiers range from 1300 to 1500 °C; it requires the FT of feeding coal ash to be 50‐100 °C lower than such temperatures for ash slagging . Figure shows the FT of the ash as a function of the content of CaO/MgO added.…”

Section: Resultsmentioning

confidence: 99%

Synergistic effect of CaO and MgO addition on coal ash fusibility in a reducing atmosphere

Xin

Liu

et al. 2019

Asia-Pacific J Chem Eng

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During coal gasification in entrained-flow slagging gasifiers, the addition of additives is a promising method to improve coal ash fusibility. In some cases, mixed additives are more effective in decreasing ash fusibility than single additive addition with the same content added. However, mechanisms of mixed additive addition for improving ash melting are scarce. In this study, the effect of CaO, MgO, and their mixtures on the ash flow temperature (FT) of Chinese bituminous coal was investigated. The results show that the single addition of CaO or MgO influenced the ash FT of the test coal sample. The addition of CaO and MgO mixture synergistically decreased the ash FT relative to their single addition. When the ratio of CaO to MgO was 5:5 (mass ratio) in the mixture, the FT decreased to 1297°C, which is 69°C and 110°C lower than that of the single addition of CaO and MgO, respectively. The formation of a lowtemperature eutectic from the interactions between anorthite and olivine caused such synergistic effects. KEYWORDS ash flow temperature, CaO and MgO mixture, low-temperature eutectic, synergistic effect

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“…A large volume of studies has been carried out on ash fusion characteristics of coal and biomass ash, mainly involving AFTs, 14–16 mineral phases, 17,18 and their interactions of coal/biomass ash, 19,20 as well as the evolution of troublesome elements 3,21,22 . The research on ash fusion characteristics is usually associated with the analysis of AFTs obtained from high‐temperature fusion test.…”

Section: Introductionmentioning

confidence: 99%

Experimental and kinetic studies on ash fusion behavior: a high‐precision acquisition method for ash fusion temperatures

Yuan

Niu

Wang

et al. 2021

Asia-Pacific J Chem Eng

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Ash fusion characteristics including ash properties and morphological changes in high‐temperature fusion test were studied among four types of fuels comprising two woody biomass, three straw biomass, two bituminous coals, and three biomass/coal mixtures. On the basis of ash fusion behavior and kinetic analysis of the ash melting process, a high‐precision acquisition method for ash fusion temperatures (AFTs) was developed. First, a reading index of AFTs was proposed; that is, in high‐temperature fusion test, initial deformation temperature (IDT), softening temperature (ST), and fluid temperature (FT) could be identified by the height shrinkage of 38%, 86%, and 98%, or the area shrinkage of 50%, 77%, and 97%, respectively. Kinetic analysis conducted on height/area shrinkage indicated that activation energy was highly related to temperature difference among IDT, ST, and FT, and low activation energy facilitated the enlargement of the temperature differences of ST‐IDT and FT‐ST. XRD patterns illustrated low activation energy had a promotion effect on the generation of higher melting substances such as KAlSi3O8 and CaSiO3, causing the elevation of the ST and FT. At last, a calculation method for AFTs based on activation energy and average height/area shrinkage was performed, which had high repeatability within an average error of ~6°C.

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Investigation on Blended Ash Fusibility Characteristics of Biomass and Coal with High Silica–Alumina

Cited by 51 publications

References 43 publications

Investigation on Ash-Fusion Characteristics of Livestock Manure and Low-Rank Coals

Investigation on Ash-Fusion Characteristics of Livestock Manure and Low-Rank Coals

Synergistic effect of CaO and MgO addition on coal ash fusibility in a reducing atmosphere

Experimental and kinetic studies on ash fusion behavior: a high‐precision acquisition method for ash fusion temperatures

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