Comparative study of the carbon structure of chars formed from coal with plastic waste and coal tar pitch additives

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2024-10-22 DOI:10.1007/s42823-024-00823-0

Joseph Appiah, Lu Tian, Xiuli Xu, Jinxiao Dou, Jiawei Wang, Xingxing Chen, Jianglong Yu

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Abstract

Plastic wastes such as polyethylene terephthalate have recently been incorporated into coal as additives in coke manufacturing. Plastic waste results in the reduction of high-quality coal usage while protecting the environment. Using coal tar pitch as an additive in the coal blend causes an increase in fluidity during carbonization. The volatile matter released during carbonisation affects coal thermoplasticity, hence the carbon structural parameters. This paper investigates the role of polyethylene terephthalate and the mixture of polyethylene terephthalate and coal tar pitch on carbon structure formation during coal to coke transformation. The additives were blended with coking coal in 2, 3, 4, 5, and 10% wt. The results imply that incorporating coal tar pitch into the coal/ polyethylene terephthalate mixture improves the crystallite height of the resulting semi-coke. The addition of coal tar pitch and polyethylene teraphthalate blend to coking coal at a percentage below 5%wt. leads a positive impact on the crystallite height of the resulting coal char. The incorporation of coal tar pitch into the blend decreased the average interlayer spacing. At elevated temperatures, the polyethylene terephthalate in the blend causes an increase in the mean tortuosity. However, incorporating coal tar pitch into the blend led to about 3.3% decrease in mean tortuosity.

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最近，聚对苯二甲酸乙二醇酯等塑料废料作为焦炭生产的添加剂被掺入煤炭中。塑料废料可减少优质煤的使用，同时保护环境。使用煤沥青作为煤混合物的添加剂可增加碳化过程中的流动性。碳化过程中释放的挥发性物质会影响煤的热塑性，从而影响碳的结构参数。本文研究了聚对苯二甲酸乙二醇酯以及聚对苯二甲酸乙二醇酯和煤沥青混合物在煤转化为焦炭过程中对碳结构形成的作用。添加剂分别以 2、3、4、5 和 10% 的重量百分比与炼焦煤混合。结果表明，在煤/聚对苯二甲酸乙二醇酯混合物中加入煤沥青可提高所得半焦的结晶高度。炼焦煤中添加煤沥青和聚对苯二甲酸乙二醇酯混合物的比例低于 5%（重量比）时，会对所得煤炭的结晶高度产生积极影响。在混合物中加入煤沥青降低了平均层间距。在高温下，混合物中的聚对苯二甲酸乙二醇酯会导致平均曲度增加。然而，在混合物中加入煤沥青会导致平均曲度下降约 3.3%。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.