Multiscale analysis of fine slag from pulverized coal gasification in entrained-flow bed

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-02-03 DOI:10.1007/s40789-023-00660-y
Lirui Mao, Mingdong Zheng, Baoliang Xia, Facun Jiao, Tao Liu, Yuanchun Zhang, Shengtao Gao, Hanxu Li
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Abstract

Fine slag (FS) is an unavoidable by-product of coal gasification. FS, which is a simple heap of solid waste left in the open air, easily causes environmental pollution and has a low resource utilization rate, thereby restricting the development of energy-saving coal gasification technologies. The multiscale analysis of FS performed in this study indicates typical grain size distribution, composition, crystalline structure, and chemical bonding characteristics. The FS primarily contained inorganic and carbon components (dry bases) and exhibited a "three-peak distribution" of the grain size and regular spheroidal as well as irregular shapes. The irregular particles were mainly adsorbed onto the structure and had a dense distribution and multiple pores and folds. The carbon constituents were primarily amorphous in structure, with a certain degree of order and active sites. C 1s XPS spectrum indicated the presence of C–C and C–H bonds and numerous aromatic structures. The inorganic components, constituting 90% of the total sample, were primarily silicon, aluminum, iron, and calcium. The inorganic components contained Si–O-Si, Si–O–Al, Si–O, SO42−, and Fe–O bonds. Fe 2p XPS spectrum could be deconvoluted into Fe 2p1/2 and Fe 2p3/2 peaks and satellite peaks, while Fe existed mainly in the form of Fe(III). The findings of this study will be beneficial in resource utilization and formation mechanism of fine slag in future.

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内流床煤粉气化细渣的多尺度分析
细炉渣(FS)是煤气化过程中不可避免的副产品。细渣是露天堆放的简单固体废弃物,容易造成环境污染,资源利用率低,制约了煤气化节能技术的发展。本研究对 FS 进行的多尺度分析表明了典型的粒度分布、成分、晶体结构和化学键特性。FS 主要含有无机成分和碳成分(干基),粒度呈 "三峰分布",形状既有规则的球形,也有不规则的球形。不规则颗粒主要吸附在结构上,分布密集,具有多个孔隙和褶皱。碳成分主要为无定形结构,具有一定的有序性和活性位点。C 1s XPS 光谱显示存在 C-C 和 C-H 键以及许多芳香结构。无机成分占样品总量的 90%,主要是硅、铝、铁和钙。无机成分中含有硅-O-硅、硅-O-铝、硅-O、SO42-和铁-O 键。铁 2p XPS 光谱可分解为铁 2p1/2 峰、铁 2p3/2 峰和卫星峰,而铁主要以铁(III)的形式存在。这项研究的结果将有助于今后精细矿渣的资源利用和形成机制。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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