Some factors influencing the fluidity of coal blends: Particle size, blend ratio and inherent oxygen species

Mochizuki, Yuji; Naganuma, Ryo; Uebo, Kazuya; Tsubouchi, Naoto

doi:10.1016/j.fuproc.2017.01.017

Cited by 24 publications

(9 citation statements)

References 34 publications

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“… 49 , 50 Moreover, with the increase in high-temperature residence time, the volatile matter lodged at the pore mouth is removed and more pores are opened, thereby causing the increase in the SSA and volume of micropores and mesopores. 10 However, the micropore SSA, micropore volume, and mesopore volume of the gasification-coke slightly decrease when the high-temperature residence time is more than 4 h. The reason for such results could be that the prolongation of the high-temperature residence time could lead to an increase in the degree of gasification-coke graphitization. The progress of graphitization causes the crystalline structure of the gasification-coke to reach unity, causing the mesopores and macropores in the gasification-coke to collapse, along with the disappearance of some micropores.…”

Section: Resultsmentioning

confidence: 97%

Pore Structure and Fractal Characteristic Analysis of Gasification-Coke Prepared at Different High-Temperature Residence Times

et al. 2020

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An accurate and quantitative description of the pore structure of gasification-coke using fractal geometry could be of great significance to its industrial utilization. In this study, gasification-coke was prepared with low-quality coal blending at different high-temperature residence times to investigate the variation in the pore structure, fractal dimensions, reactivities, and their relationship. The pore structure parameters (e.g., specific surface area, pore volume, and average pore diameter) of gasification-coke were investigated by low-temperature N 2 adsorption/desorption and mercury intrusion porosimetry. Fractal dimensions D 1 and D 2 (at relative pressures of 0–0.5 and 0.5–1, respectively) were calculated using the fractal Frenkel–Halsey–Hill model, and the fractal dimension D 3 was obtained using the Menger sponge model. The results show that the pore structure systems of gasification-coke prepared at different high-temperature residence times are continuous and complete, which contributes to the gasification reaction. The variation trend of the macropore structure parameters is more complex than that of micropore and mesopore with the extension of the high-temperature residence time. It is found that D 1 is linearly correlated with the micropore specific surface area, indicating that D 1 is more suitable for reflecting the roughness of the micropore surface; D 2 is linearly correlated with the mesopore volume and can describe the volumetric roughness of the mesopore; and D 3 reflects the irregularities and surface roughness of the macropores. Gasification reactivity is closely related to the D 2 value, and the reactivity of the gasification-coke may be improved if the number of mesopores is increased by controlling the high-temperature residence time or other pyrolysis conditions. The research results will provide theoretical reference for controlling the gasification reaction of gasification-coke and gasifier design.

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Section: Resultsmentioning

confidence: 97%

Pore Structure and Fractal Characteristic Analysis of Gasification-Coke Prepared at Different High-Temperature Residence Times

et al. 2020

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“…Maksimum fluiditas merupakan salah satu parameter penting yang sangat berkaitan dengan kualitas dan kekuatan kokas yang dihasilkan (Diez et al 2002;Diaz-Faes et al 2007;Tsubouchi et al, 2014;Smedowski dan Piechaczek, 2016;Vega et al 2017). Maksimum fluiditas juga merupakan salah satu parameter yang digunakan dalam proses pencampuran (blending) batubara untuk menghasilkan produk kokas yang berkualitas (Thomas, 2013;Mochizuki et al 2017).…”

Section: Dalamunclassified

Pengaruh Kandungan Abu Dan Zat Terbang Terhadap Maksimum Fluiditas Batubara Formasi Tanjung Di Daerah Sekako, Kalimantan Tengah

et al. 2020

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ABSTRAK Batubara high – low volatile bituminous Formasi Tanjung di Kalimantan Tengah dikenal berpotensi sebagai coking coals. Maksimum fluiditas merupakan ssalah satu parameter penting yang sangat berkaitan dengan kualitas kokas yang dihasilkan. Penelitian ini bertujuan untuk menganalisis distribusi kandungan zat terbang dan abu serta pengaruhnya terhadap maksimum fluiditas batubara khususnya untuk batubara dari Formasi Tanjung. Batubara diambil dari lapangan di Daerah Sekako dengan channel sampling ply by ply berdasarkan litotipenya kemudian dilakukan analisis laboratorium meliputi analisis proksimat dan analisis Gieseler plastometer. Batubara yang diambil dari 2 seam Formasi Tanjung yang diproduksi tersusun dominan atas litotipe bright coals dan banded bright coals dengan memiliki kandungan abu (ash) 2,79 – 9,05 (wt%, adb), kandungan zat terbang (volatile matter) 35,14 – 39,50 (wt%, adb) dan maksimum fluiditas 22263 – 49029 (ddpm). Kandungan abu berkorelasi negatif kuat (r = -0,656; R2 = 0,431) dan tidak berpengaruh signifikan (sig. 0,055 > 0,05) terhadap maksimum fluiditas batubara. Sementara itu, kandungan zat terbang berkorelasi positif sangat kuat (r = 0,794; R2 = 0,6301) dan berpengaruh signifikan (sig. 0,003 < 0,05) terhadap maksimum fluiditas batubara. Semakin tinggi kandugan abu maka maksimum fluiditas batubara semakin rendah dan sebaliknya semakin tinggi kandungan zat terbang maka maksimum fluiditas batubara semakin tinggi. Hubungan kandungan zat terbang dengan maksimum fluiditas batubara dapat dinyatakan dengan persamaan y = 6327,9x - 200248.

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“…Whereas, paraffin has very low oxygen content. Materials with a high oxygen content when blended with coal tend to increase its reactivity resulting in less ordered materials [13,14].…”

Section: Main Characteristics Of the Raw Materialsmentioning

confidence: 99%

Influence of binder type on greenhouse gases and PAHs from the pyrolysis of biomass briquettes

Florentino-Madiedo

Díaz-Faes

Garcı́a

et al. 2018

Fuel Processing Technology

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Five blends prepared with torrified sawdust, coal plus either coal tar, coal tar sludge, paraffin or molasses designed to serve as binder in the preparation of briquettes were pyrolysed in a rotary oven. The coal and the torrified sawdust used in the preparation of the blends were also studied. The condensable gases were analyzed by gas chromatography (GC) and infrared spectroscopy (FTIR). The permanent gases were also analyzed by gas chromatography. The concentration of nineteen polyaromatic hydrocarbons in the condensable products was analyzed with special focus on those considered as priority and carcinogenic pollutants. The results obtained from FTIR were confirmed by those obtained by GC. It was found that the inclusion of biomass produces a decrease in the amount of (polyaromatic hydrocarbons) PAHs in the condensable pyrolysis products and an increase in the concentration of CO2 in the gases, although these gases are carbon neutral.

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Some factors influencing the fluidity of coal blends: Particle size, blend ratio and inherent oxygen species

Cited by 24 publications

References 34 publications

Pore Structure and Fractal Characteristic Analysis of Gasification-Coke Prepared at Different High-Temperature Residence Times

Pore Structure and Fractal Characteristic Analysis of Gasification-Coke Prepared at Different High-Temperature Residence Times

Pengaruh Kandungan Abu Dan Zat Terbang Terhadap Maksimum Fluiditas Batubara Formasi Tanjung Di Daerah Sekako, Kalimantan Tengah

Influence of binder type on greenhouse gases and PAHs from the pyrolysis of biomass briquettes

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