Adjustment behaviors of blending coal on the ash fusion characteristics of coal with a high ash fusion temperature

Ji, Shaohua; Li, Junguo; Fang, Yitian

doi:10.1007/s10973-016-5372-3

Cited by 9 publications

(5 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, the ashes (1.00 g) were put into a ceramic crucible, and the crucible was inserted into the AFT analyzer. Then, the mixed gases of 50% hydrogen and 50% carbon oxide were introduced into the AFT analyzer to replace air and keep a reducing atmosphere . When the per-setting temperature was reached, the ash samples in the muffle furnace were transformed into ice water quickly to prevent phase variation and crystal segregation.…”

Section: Methodsmentioning

confidence: 99%

“…Then, the mixed gases of 50% hydrogen and 50% carbon oxide were introduced into the AFT analyzer to replace air and keep a reducing atmosphere. 38 When the per-setting temperature was reached, the ash samples in the muffle furnace were transformed into ice water quickly to prevent phase variation and crystal segregation. These quenched samples were first set in a vacuum drying oven at 105 °C for 24 h and stored in a cabinet dryer before measurement.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Investigation on the Regulation Mechanism of Ash Fusion Characteristics in Coal Blending

Fan

Fang

2016

Energy Fuels

Self Cite

View full text Add to dashboard Cite

Blending coal is a promising way to adjust ash fusion characteristics for coal with a high ash fusion temperature (AFT). Ash fusion characteristics of coal samples and their variation behaviors through coal blending were discussed. The regulation mechanism was investigated by an X-ray powder diffractometer with the assistance of normalized reference intensity ratio software and a scanning electron microscopy analyzer equipped with energy-dispersive X-ray spectrometry. The results show that the variations of ash fusion behaviors were diversified in blending coal type and the mass ratio. It was found that the optimized blending mass ratio was in the range of 30–50% for three blending coals to meet Liangbaoshi (LBS) coal gasification in an entrained-flow bed gasifier (EFB). A very high melting point (MP) mullite formation at a high temperature makes the LBS AFT higher. With an increasing blending coal mass ratio, the formations of low-MP hercynite, anorthite, and gehlenite, their low melting eutectics, and these contents increase, resulting in the AFT decrease of mixed ashes. The content of an abundant amorphous matter increases with a low-AFT coal mass ratio increase, also leading to the AFT decrease.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Investigation on the Regulation Mechanism of Ash Fusion Characteristics in Coal Blending

Fan

Fang

2016

Energy Fuels

Self Cite

View full text Add to dashboard Cite

show abstract

“…Aggregates have no definite shape or fixed number of nanoparticles, and their diameters can be more than 500 nm (Table 2). Previous studies have mainly focused on nanoparticles formed by the conversion of inorganic minerals during coal combustion [35]. However, a large number of nanoparticles are also found in raw coal.…”

Section: Important Potential Sources Of Nanoparticles During Coal Com...mentioning

confidence: 99%

Identification of Natural Nearly or Nanoscale Particles in Bituminous Coal: An Important Form of Elements in Coal

Zhang

Zuo

et al. 2023

Sustainability

View full text Add to dashboard Cite

Nanoparticles are ubiquitous in nature and are also found in raw coal, which plays an irreplaceable role in the global economy. In this study, raw coal samples were obtained from Gaojiapu Coal Mine in Shanxi Province, China. The elementary composition of nanoparticles was determined using energy-dispersive X-ray spectroscopy. The structural and chemical characteristics of nanoparticles were analyzed using transmission electron microscopy. Results revealed that there were multiple types of nanoparticles in the raw coal, such as S-, Ca-, Ba-, Ni-, Cr-, Si-, Sr-, and V-bearing nanoparticles. These nanoparticles exhibited various sizes and complex, irregular shapes. Our findings revealed that elemental nanoparticles occur in raw coal. These nanoparticles include celestite and barite nanoparticles. In addition, nanoparticles with Ni, Cr, and V in composition are also included in raw coal. These nanoparticles, which contain heavy metal elements, have great potential to harm the human body. Meanwhile, compared with the characteristics of nanoparticles produced by coal combustion, the nanoparticles in raw coal may be an important potential source of the nanoparticles produced by coal combustion.

show abstract

“…This indicates that the effect of ash composition on its fusion behavior is rather complicated since the various components always interact with each other, forming some refractory minerals (quartz, mullite, rutile, and kaolinite) , and low-melting eutectics. To improve the viscosity–temperature characteristics of the coal ash, blending is a promising method , by which the high-melting-point mullite and quartz are transformed into the low-melting-point eutectics . Many researchers have established various models to find an empirical or statistical correlation between the ash fusion temperatures and ash composition. − Sasi et al devised the prediction model using two approaches, namely, a thermodynamic approach using the ChemApp subroutine and a purely data-driven approach using artificial neural networks, obtaining a conclusion that a combination of these two approaches provided an efficient and reliable way toward the industrial application …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Melting Characteristics of Coal Ash and Properties of Fly Ash to Understand the Slag Formation in the Shell Gasifier

Wang

Cheng

et al. 2021

ACS Omega

View full text Add to dashboard Cite

The flow temperature (FT) of the coal ash from the Liuqiao no. 2 mine in North Anhui Province (C00) is too high (∼1520 °C) to fit the Shell gasifier due to its relatively high content of SiO 2 and Al 2 O 3 . To solve this problem, a series of coals were blended with C00 with different ratios, and the relations between FT and the ash composition were investigated. The coal ash was analyzed by X-ray diffraction, Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy−EDX to elucidate the mechanism of the improved ash fusion performance and the slag formation in the waste heat boiler of the gasifier. It is shown that FT is relevant to the coal ash compositions as well as the structures formed at high temperatures. The existence of alkaline oxides (CaO, MgO, and Fe 2 O 3 ) decreases the coal ash FT to a low level. The FT can decrease to <1350 °C to cater to the Shell gasifier by blending C00 and C03 with a mass ratio of 4:6 owing to the plentiful alkaline oxides in C03. The FTIR results indicate that the high flow temperature of C00 is attributed to the formation of mullite at high temperatures. The coal blending with various ratios changes the compositions of CaO, MgO, and Fe 2 O 3 , which can form some low-melting-point eutectic compounds with SiO 2 and Al 2 O 3 under high temperatures, inhibit the formation of mullite, and thus decrease the ash FT. The coal ash FT was found to have a good linear relation with the ash compositions, which can sever as a reference to the coal blending. According to the model parameters, it is shown that Mg has the most significant promoting effect on the decrease in FT of the coal ash. The caking tendency of fly ash increases with the rising Ca content and an excessive Ca-based fluxing agent used in the coal blending will lead to the aggregation of the Ca-rich clasts around the fly ash particle, resulting in the plugging of the waste heat boiler in the gasifier. Therefore, the Mg-based fluxing agent is more promising to improve the ash fusion performance and reduce the caking tendency of the coal fly ash.

show abstract

Adjustment behaviors of blending coal on the ash fusion characteristics of coal with a high ash fusion temperature

Cited by 9 publications

References 32 publications

Investigation on the Regulation Mechanism of Ash Fusion Characteristics in Coal Blending

Investigation on the Regulation Mechanism of Ash Fusion Characteristics in Coal Blending

Identification of Natural Nearly or Nanoscale Particles in Bituminous Coal: An Important Form of Elements in Coal

Melting Characteristics of Coal Ash and Properties of Fly Ash to Understand the Slag Formation in the Shell Gasifier

Contact Info

Product

Resources

About