Effect of coal blending and ashing temperature on ash sintering and fusion characteristics during combustion of Zhundong lignite

Li, Jianbo; Zhu, Mingming; Zhang, Zhezi; Zhang, Kai; Shen, Guoqing; Zhang, Dongke

doi:10.1016/j.fuel.2017.01.064

Cited by 84 publications

(45 citation statements)

References 34 publications

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“…To resolve the serious slagging and fouling problems of high‐Na Zhundong coal, Niu et al 32 employed leaching and various additives to improve the AFTs of Zhundong coal and thus to reduce the melt‐induced slagging. Similarly, Li et al 33 reported that with increasing ratio of Australian bituminous mixed with Zhundong lignite, AFTs increased and the slagging propensity of Zhundong lignite decreased.…”

Section: Introductionmentioning

confidence: 89%

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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Section: Introductionmentioning

confidence: 89%

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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“…Research work on the combustion of different types of coal blends has been carried out by many researchers (Shih and Frey 1995;Lv et al 2006;Baek et al 2014;Raaj et al 2016;Li et al 2017;Wang et al 2017). Shih and Frey studied different types of theoretical models that can be used in coal blending to optimize the desired coal properties.…”

Section: Introductionmentioning

confidence: 99%

Combustion characteristics of high ash Indian thermal, heat affected coal and their blends

Aich

Nandi

Bhattacharya

2021

Int J Coal Sci Technol

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Onsite mine fire generates large volumes of heat-affected coal in Jharia coalfields, India. Direct utilization of such heat-affected coal in thermal utilities is not feasible as such coal does not have the desirable volatile matter required for combustion. In the present work, experimental studies have been carried out to investigate the possible utilization of such heat-affected coal in thermal utilities by blending with other coal. Heat-affected coal (31% ash and 5300 kcal/kg GCV) collected from Jharia coalfield were blended with thermal coal (28% ash and 5650 kcal/kg GCV) in different ratios of 90:10, 80:20, 70:30 and 60:40 to identify the desirable blend ratio for burning of blended coal in thermal utilities. Burning characteristics of all the coals were carried out using TGA. Various combustion parameters such as ignition temperature, peak temperature, burnout temperature, ignition index, burnout index, combustion performance index, rate and heat intensity index of the combustion process and activation energy were evaluated to analyse the combustion process. Experimental and theoretical analysis shows the blend ratio of 90:10 can be used in place of only thermal coal in utilities to reduce the fuel cost.

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“…e study found the coal blends could extend combustion operation by controlling particle agglomeration and bed defluidization. Another study also reported the effect of coal blending and ashing temperature on ash sintering and its characterization using lignite from China blended with Australian bituminous and Indonesian lignite, respectively, at various blending ratios [5][6][7]. Furthermore, Plaza [8] developed a tool to predict the effects of biomass cofiring with coal on pulverized fired boilers' ash deposition and thermal performance.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, Plaza [8] developed a tool to predict the effects of biomass cofiring with coal on pulverized fired boilers' ash deposition and thermal performance. In their work, Chuan et al [6] investigated the influence factors of slagging and fouling using Zhundong coal and a Si/Al-dominated lowrank coal with various ratios. e results demonstrate that blending has a severe slagging and fouling tendency when the alkali/acid ratio is greater than 0.400, and the difference between ST and DT (ST-DT) is less than 20 °C.…”

Section: Introductionmentioning

confidence: 99%

Ash Evaluation of Indonesian Coal Blending for Pulverized Coal-Fired Boilers

Hariana¹,

Prismantoko²,

Ahmadi³

et al. 2021

Journal of Combustion

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Coal calorific value is one of the main considerations for using coal as a power plant fuel. In addition, the requirements for indications of slagging and fouling are also important to maintain combustion efficiency. However, coal power plants often experience problems in boiler operations due to the use of certain types of coal, even though they have a relatively high calorific value. This research investigates the effect of coal blending on ash fouling and slagging in an experimental investigation using a drop tube furnace with or without additives. Five different types of coal from different locations have been used in this study. Pulverized low-rank coal samples are burned in a drop tube furnace at 1,175°C with probe temperatures of 550°C and 600°C, corresponding to the combustion chamber of 600 MW power plants, including superheater and reheater areas. The ash particles’ characteristics and material composition were also analyzed using scanning electron microscopy with energy-dispersive X-ray (SEM-EDX) and X-ray diffraction (XRD), respectively. All coal mixture combinations demonstrated potential as a fuel for power plants that use pulverized coal-fired boilers. Because of its capacity to reduce slagging and fouling potentials, combining coal blending with the use of chemical additives yielded the greatest results.

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Effect of coal blending and ashing temperature on ash sintering and fusion characteristics during combustion of Zhundong lignite

Cited by 84 publications

References 34 publications

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

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

Combustion characteristics of high ash Indian thermal, heat affected coal and their blends

Ash Evaluation of Indonesian Coal Blending for Pulverized Coal-Fired Boilers

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