Characteristics of Different Sized Slag Particles from Entrained-Flow Coal Gasification

Pan, Chanchan; Liang, Qinfeng; Guo, Xiaolei; Dai, Zhenghua; Liu, Haifeng; Gong, Xinglong

doi:10.1021/acs.energyfuels.5b01326

Cited by 103 publications

(28 citation statements)

References 30 publications

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“…This compares very closely with 16.1 wt % of Si and 0.2 wt % of S reported for large spherical particles of fine slag. However, the other classifications of fine slag, adhesive spherical fines, floccules, porous irregular particles, and coarse slag differed in the concentration of Si and S [22]. Silicon at present is reported to have no negative effect on heat recovery equipment, but sulphur does pose a negative threat, as it is listed as one of the ions that cause corrosion.…”

Section: Morphology and Elemental Composition Of Carbon Particlesmentioning

confidence: 97%

Analytical and Thermal Evaluation of Carbon Particles Recovered at the Cyclone of a Downdraft Biomass Gasification System

2017

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Gasification of biomass gives off syngas that is contaminated mostly by carbon particulates and tars. The degree of contamination is attributed to factors such as gasification process, type of gasifier and type of biomass material. Downdraft gasifier minimizes the production of tar to a tolerable limit for engine applications; however, carbon particles still pose a challenge particularly with the integration of a heat exchanger for the purpose of heat recovery from the product gas. The presence of carbon particles in the syngas does influence the heat recovery process and materials used in the recovery. Hence, there is need for the characterization of these carbon particles to ascertain their chemical compositions, thermal properties and morphological features. This study was aimed at evaluating the characteristic features of carbon particles recovered from the syngas stream during gas cleaning at the cyclone. The elemental analysis of the carbon particle samples was performed using energy dispersive X-ray spectroscopy. An electron beam from scanning electron microscopy was passed through the sample surface at a magnification of 1000x and an accelerating voltage of 15 kV to determine the morphological features of the carbon particles. Their thermal properties were investigated using a thermogravimetric analyzer at a heating rate of 10 • C/min. A weight loss of approximately 5.4 wt % was recorded at the maximum temperature of 900 • C. Silicon, oxygen and carbon were found to be the dominating elements in the carbon particulate.

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Section: Morphology and Elemental Composition Of Carbon Particlesmentioning

confidence: 97%

Analytical and Thermal Evaluation of Carbon Particles Recovered at the Cyclone of a Downdraft Biomass Gasification System

2017

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“…The high-carbon particles in the coarse slag of the fixed bed had a large particle size (4–13 mm) and high-density carbon structure with low sulfur content. Pan et al 6 studied the differences for pore structure, carbon content, and crystal structure of coarse and fine slag with entrained flow pulverized coal gasifier. In addition, the pore structure of high-carbon particles was developed, which was a high-quality raw material for the preparation of activated carbon.…”

Section: Introductionmentioning

confidence: 99%

Grading Characteristics of Texaco Gasification Fine Slag: Quality Distinction and Selective Distribution of Trace Elements

et al. 2020

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Aiming at hard-to-reuse gasification fine slag, a new process of treating gasification fine slag by classification was presented. The screening treatment was carried out based on ensuring the original particle size composition of fine slag, and it was divided into six particle size ranges as follows: +0.5, 0.3–0.5, 0.125–0.3, 0.074–0.125, 0.045–0.074, and −0.045 mm. The physical properties of different size range samples were examined by elemental analysis, X-ray diffraction, X-ray fluorescence, cold field emission scanning electron microscopy, and energy-dispersive spectrometry. The results showed that the carbon content of the median section (0.125–0.3 mm) fine slag had significant improvement compared with the other section fine slag. The carbon distribution of the +0.125 mm fine slag was concentrated, while the carbon distribution of −0.125 mm was dispersed and closely mixed with minerals. The content of trace elements Cr, Mn, Ni, V, Cd, Pb, and Mo was determined by inductively coupled plasma–mass spectrometry, and the correlation between minerals and trace elements of different particle size-graded fine slag was evaluated by Pearson correlation analysis. The results suggested that high vaporization temperature and metallic oxide forms of trace elements had a strong correlation with feldspar.

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“…Coal gasification slag is a byproduct of entrained flow coal gasification and can be classified into two types, coal gasification fine slag (CGFS) and coal gasification coarse slag, according to the location of the discharge . The improper disposal of coal gasification slag has resulted in environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and nonisothermal crystallization properties of coal gasification fine slag glass bead‐filled polypropylene composites

Liu

Zhang

et al. 2019

J of Applied Polymer Sci

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Coal gasification fine slag (CGFS) was subjected to calcination at 600 °C for 7 h, forming CGFS glass beads (CGFSGB). CGFSGB was successfully incorporated into polypropylene (PP) by melt compounding. The results indicated that CGFSGB has the potential to replace calcium carbonate in the plastics market. Thermogravimetric analysis showed obvious reinforcement in thermal stability by incorporation of CGFSGB, but crystallization ability decreased. The CGFSGB was modified with 3‐methacryloxypropyltrimethoxy silane (KH570) and hydrochloric acid (HCl) to improve the compatibility between the CGFSGB and PP, resulting in CGFSGB‐S and CGFSGB‐A, respectively. The tensile strength, thermal stability, and crystallization ability of PP composites and dispersity of the CGFSGB were increased after modification by KH570 and HCl, and the PP/CGFSGB‐A composites showed better performance than PP/CGFSGB‐S. Surface area and pore structure analysis and transmission electron microscopy revealed that good mechanical performance of PP/CGFSGB‐A may be attributed to existence of mesopores in CGFSGB‐A. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47803.

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Characteristics of Different Sized Slag Particles from Entrained-Flow Coal Gasification

Cited by 103 publications

References 30 publications

Analytical and Thermal Evaluation of Carbon Particles Recovered at the Cyclone of a Downdraft Biomass Gasification System

Analytical and Thermal Evaluation of Carbon Particles Recovered at the Cyclone of a Downdraft Biomass Gasification System

Grading Characteristics of Texaco Gasification Fine Slag: Quality Distinction and Selective Distribution of Trace Elements

Mechanical and nonisothermal crystallization properties of coal gasification fine slag glass bead‐filled polypropylene composites

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