Investigation on ash fusion temperature and slagging characteristic of Zhundong coal blends, Part 1: The effect of two solid wastes from calcium carbide production

Wang, Yibin; Li, Liangyu; An, Qiwei; Tan, Houzhang; Wang, Meng; He, Lihai; Wang, Zhuozhi; He, Guang; Yang, Jixian

doi:10.1016/j.fuproc.2021.107138

Cited by 14 publications

(2 citation statements)

References 41 publications

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“…For coal with high ash melting temperatures, such as high-silica–aluminum coals, the existence of a large number of refractory materials in ash slag at high temperatures can cause poor ash slag fluidity. − Furthermore, as a result of the complexity and variability of coal types, for some coal with a lower ash melting temperature, although the operating temperature is about 100 °C above the FT, its viscosity is still higher and shows poor fluidity, which makes it difficult to match the liquid slagging requirements of an entrained-flow gasifier. Therefore, in an actual industrial operation process, coal blending or adding flux is commonly adopted to achieve the regulation of coal ash slag fluidity, which is in essence to realize the regulation of coal ash fluidity by altering the ash chemical composition of the feed coal. − Because the transportation cost of coal blending is high and difficult to control, the addition of flux is the optimal scheme to regulate the fluidity of coal ash slag. At present, the main additives to regulate the coal ash fluidity mainly include biomass, solid waste, etc.…”

Section: Introductionmentioning

confidence: 99%

Review and Perspectives of Ash Slag Fluidity during Co-gasification of Industrial Solid Waste and Coal: Characteristics, Chemistry, Controlling Mechanisms, and Regulation

Zhang,

Song,

et al. 2024

Energy Fuels

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The stable fluidity of slag at a high temperature is crucial for the long-period operation of an entrained-flow gasifier. The diversity and difference of coal ash make it difficult to meet the requirements for stable slagging in a gasifier. Consequently, coal blending or adding flux has been employed in the industry to improve the fluidity of coal ash slag. As a carbon-containing matrix, industrial solid waste is a kind of energy substance. Utilizing existing industrial gasifiers to blend combustion of industrial solid waste can not only transform industrial solid waste into fuel but also improve the entrained-flow gasifier slagging performance using the unique ash chemical composition of industrial solid waste. Therefore, sorting out the effect of industrial solid waste on coal ash slag fluidity can not only clarify the regulating mechanism of coal ash slagging but also provide some theoretical support for the large-scale consumption of industrial solid waste. In this review, the effects of acid-and alkali-rich industrial solid wastes and coal co-gasification on coal ash slag fluidity were reviewed from the perspectives of ash melting characteristics and viscosity−temperature characteristics, and the effect mechanism of SiO 2 , Al 2 O 3 , SiO 2 / Al 2 O 3 (S/A), CaO, Fe 2 O 3 , and CaO−Fe 2 O 3 (Ca−Fe) compound fluxes on coal ash slag fluidity were elaborated from the viewpoint of mineral evolution and microstructure. Meanwhile, studies on the ash slag fluidity during the co-gasification of industrial solid waste and coal were prospected, which could afford theoretical guidance for the stable slagging of an entrained-flow gasifier and the resourceful treatment of industrial solid waste.

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Section: Introductionmentioning

confidence: 99%

Review and Perspectives of Ash Slag Fluidity during Co-gasification of Industrial Solid Waste and Coal: Characteristics, Chemistry, Controlling Mechanisms, and Regulation

Zhang,

Song,

et al. 2024

Energy Fuels

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“…13,14 It is worth noting that the high content of Na 2 O and CaO in ZD coal ash reduces the ash fusion temperature, thereby increasing the risk of the heating surface slagging in coal-fired boilers. In this regard, numerous investigations have been carried out to study the slagging and fouling characteristics, homogenous and heterogeneous condensation of alkali metals, 15,16 fusion characteristics, 17 ash deposition characteristics, 18 the impact of washing on the coal feature, 19 coal blending, 20 and additives of ZD coal. 21 Overall, in these investigation, it was intended to explore the slagging and fouling mechanism and find new ways to inhibit or control this phenomenon.…”

mentioning

confidence: 99%

Impact of reacting pressure on Na thermal transformation in two full‐scale devices using Zhundong coal at similar temperature

Wang

Wei

Liu

et al. 2022

Asia-Pacific J Chem Eng

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Gasification and combustion are two common methods for Zhundong (ZD) coal utilization. In the present study, it was intended to investigate the thermal transformation of Na in ZD coal at the Lurgi fixed bed gasifier (Lurgi) and circulating fluidized bed boiler (CFBB). To this end, raw coal samples before gasification and gasified slags were gathered from Lurgi, and the raw coal before combustion, burned slag, and fly ash were collected from CFBB. The occurrence form of Na was analyzed by extraction experiments, and the samples were analyzed by inductively coupled plasma-optical emission spectrometry (ICP-OES), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The obtained results revealed that insoluble Na in Lurgi slag exceeded 90% under the high-pressure gasification process. It was found that the high temperatures and high in Lurgi intensify the conversion of sodium to Na 2 Ca 3 Si 2 O 8 and NaAlSiO 4 . The performed analyses revealed that the insoluble Na content in CFBB slag and fly ash was above 92%, and Na 2 SiO 3 and NaAlSi 3 O 8 were the main sodium minerals in CFBB solid residue. It was found that 76.64% of the initial Na content of raw coal in Lurgi migrated into slag after the gasification process, which was 7.05% higher than the sum of slag and fly ash in CFBB after combustion. During the sodium thermal transformation in Lurgi and CFBB, high pressures significantly reduce the release of gaseous Na from coal ash so more Na was retained in slag.

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Combined effect of ball-milled ash and ammonium dihydrogen phosphate on fouling, slagging, and combustion characteristics of high-sodium zhundong coal

Su,

Chen,

Bian

et al. 2024

J Therm Anal Calorim

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Investigation on ash fusion temperature and slagging characteristic of Zhundong coal blends, Part 1: The effect of two solid wastes from calcium carbide production

Cited by 14 publications

References 41 publications

Review and Perspectives of Ash Slag Fluidity during Co-gasification of Industrial Solid Waste and Coal: Characteristics, Chemistry, Controlling Mechanisms, and Regulation

Review and Perspectives of Ash Slag Fluidity during Co-gasification of Industrial Solid Waste and Coal: Characteristics, Chemistry, Controlling Mechanisms, and Regulation

Impact of reacting pressure on Na thermal transformation in two full‐scale devices using Zhundong coal at similar temperature

Combined effect of ball-milled ash and ammonium dihydrogen phosphate on fouling, slagging, and combustion characteristics of high-sodium zhundong coal

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