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

Liu, Yingzu; He, Yong; Wang, Zhihua; Xia, Jun; Wan, Kaidi; Whiddon, Ronald; Cen, Kefa

doi:10.1016/j.apenergy.2018.02.015

Cited by 74 publications

(20 citation statements)

References 45 publications

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“…From the ultimate analysis in Table 1, the oxygen to carbon ratio is 1.123 for corn straw while 1.072 for poplar, which means poplar has a higher fuel rank than corn straw, i.e., poplar is closer to coal while corn straw is closer to agricultural biomass. As reported in [5], adding biomass to coal could leads the char burnout stage shifts towards an earlier time and get merged with the devolatilization stage. pellets.…”

Section: Potassium Release Characteristics Of Poplar and Corn Strawmentioning

confidence: 78%

“…The sticky layer could capture fly ash and then result in ash deposition [3,4]. Moreover, potassium could also react with sulfur and chlorine species, leading to severe fouling and corrosion [5,6]. It is therefore important to understand potassium-release mechanisms during biomass combustion in order to develop potassium control technologies and achieve better utilization of biomass resources [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of potassium release during biomass-pellet combustion and its interaction with inhibitive additives

Liu

Wan

et al. 2020

Fuel

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In the present study, two types of biomass were investigated as typical agricultural and woody biomass fuel, i.e., corn straw and poplar. Firstly, laser induced breakdown spectroscopy (LIBS) was employed to investigate the release characteristics of potassium (K) from a burning biomass pellet. In order to further investigate the correlation between K release and the combustion process, combustion parameters including pellet surface temperature and pellet diameter were simultaneously measured with LIBS. A dual-peak trend is observed in the K release history of poplar, but only a single peak is found in that of corn straw. Both biomass samples show the strongest K release during the devolatilization stage in comparison with the subsequent char burnout and ash cooking stages. Similar tendencies are observed between K release and pellet temperature, which suggests that K release is closely related to the combustion process. The K release mechanism can be attributed to temperature rise and therefore breakdown of chemical bonds during combustion. Then the release of different chemical forms of K was investigated by chemical fractionation treatment of the biomass samples. 2 The released amount of H2O-soluble, NH4Ac-soluble and HCl-soluble potassium compounds were obtained. The H2O-soluble potassium is found to be the major released potassium compound. Finally, four kinds of additives (two pure additives, i.e., silica and alumina, and two typical natural mineral additives, i.e., kaolin and mica) were added to the biomass samples to investigate their inhibition effects on K release. The natural sorbent additives show better inhibition effects than the pure ones.

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Section: Potassium Release Characteristics Of Poplar and Corn Strawmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Experimental study of potassium release during biomass-pellet combustion and its interaction with inhibitive additives

Liu

Wan

et al. 2020

Fuel

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“…2(e)). The reduction of these elements showed that volatilization of alkalis may occur during the ashing process (Liu et al 2018) or the melting of Ca/K/Na-bearing silicates occurred, and thereby decreasing the sintering temperature of ash of the blends. Figure 3 shows the SEM patterns of ash of the blends of JC and PS at 950 ℃ ashing temperature.…”

Section: Ash Morphology By Sem-eds Analysismentioning

confidence: 99%

Sintering behavior of ash from combustion of Jincheng coal and pine sawdust blends

Jing

Wang

Zhu

et al. 2020

BioRes

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Sintering behaviour of ash specimens from blends of Jincheng (JC) coal and pine sawdust (PS) was investigated using a pressure-drop sintering device combined with scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD) analysis, and FactSage modeling. The sintering temperatures consistently displayed a decreased trend when the PS was added into JC. In addition, the ashing temperature had an important influence on the sintering temperature of ash. The SEM analysis revealed a fine, irregular, and fibrous texture in the ash specimens from the lower ashing temperature. Regular block-shape particles were present in the ash from the higher ashing temperature. The EDS results showed that more Ca and Fe appeared with the increase of ashing temperature and more K and Na appeared, while Ca and Fe decreased with the addition of PS. The XRD analysis revealed that low-temperature minerals melted or co-fused with 10% PS addition into coal, while the high-temperature minerals formed with increased ashing temperature. The FactSage calculation indicated that the alkali and alkali earth metal species mainly existed in the forms of aluminosilicates and silicates. Calcium, magnesium, and potassium played a vital role during the sintering of the blends with PS.

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“…The combustion of solid fuel including conventional coal and promising biomass is the primary energy utilization technology for electric power and heat generation 1 . However, fly ash, the main by‐product of solid fuel combustion, has brought several troublesome issues to the boiler such as deposition, fouling, and corrosion, even resulting in tube explosion and unscheduled shutdown 2–5 . When the ash is subjected to the high temperature of furnace, it will semi‐melt or melt and adhere to the heating surface.…”

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

Cited by 74 publications

References 45 publications

Experimental study of potassium release during biomass-pellet combustion and its interaction with inhibitive additives

Experimental study of potassium release during biomass-pellet combustion and its interaction with inhibitive additives

Sintering behavior of ash from combustion of Jincheng coal and pine sawdust blends

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

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