Experimental study on variation law of electrical parameters and temperature rise effect of coal under DC electric field

Abstract Joule heats which are generated by coals in an applied electric field are directly correlated with variation resistivity of electrical parameters of coals. Moreover, the joule heating effect is closely related with microstructural changes and relevant products of coal surface. In the presen...

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Autores principales:	Yunpeng Yang, Zhihui Wen, Leilei Si, Xiangyu Xu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a4c86998b79b478cb2bae092aa5784de
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spelling	oai:doaj.org-article:a4c86998b79b478cb2bae092aa5784de2021-12-02T14:25:03ZExperimental study on variation law of electrical parameters and temperature rise effect of coal under DC electric field10.1038/s41598-021-86598-02045-2322https://doaj.org/article/a4c86998b79b478cb2bae092aa5784de2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86598-0https://doaj.org/toc/2045-2322Abstract Joule heats which are generated by coals in an applied electric field are directly correlated with variation resistivity of electrical parameters of coals. Moreover, the joule heating effect is closely related with microstructural changes and relevant products of coal surface. In the present study, a self-developed applied direct current (DC) field was applied onto an experimental system of coals to investigate variation resistivity of electrical parameters of highly, moderately and lowly metamorphic coal samples. Moreover, breakdown voltages and breakdown field intensities of above three coal samples with different metamorphic grades were tested and calculated. Variation resistivity of electrical parameters of these three coal samples in 2 kV and 4 kV DC fields were analyzed. Results show that internal current of all coal samples increases continuously and tends to be stable gradually after reaching the “inflection point” at peak. The relationship between temperature rise effect on anthracite coal surface in an applied DC field and electrical parameters was discussed. The temperature rise process on anthracite coal surface is composed of three stages, namely, slowly warming, rapid warming and slow cooling to stabilize. The temperature rise effect on anthracite coal surface lags behind changes of currents which run through coal samples. There’s uneven temperature distribution on anthracite coal surface, which is attributed to the heterogeneity of coal samples. In the experiment, the highest temperature on anthracite coal surface 65.8 ℃ is far belower than the lowest temperature for pyrolysis-induced gas production of coals 200 ℃. This study lays foundations to study microstructural changes and relevant products on coal surface in an applied DC field.Yunpeng YangZhihui WenLeilei SiXiangyu XuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yunpeng Yang Zhihui Wen Leilei Si Xiangyu Xu Experimental study on variation law of electrical parameters and temperature rise effect of coal under DC electric field
description	Abstract Joule heats which are generated by coals in an applied electric field are directly correlated with variation resistivity of electrical parameters of coals. Moreover, the joule heating effect is closely related with microstructural changes and relevant products of coal surface. In the present study, a self-developed applied direct current (DC) field was applied onto an experimental system of coals to investigate variation resistivity of electrical parameters of highly, moderately and lowly metamorphic coal samples. Moreover, breakdown voltages and breakdown field intensities of above three coal samples with different metamorphic grades were tested and calculated. Variation resistivity of electrical parameters of these three coal samples in 2 kV and 4 kV DC fields were analyzed. Results show that internal current of all coal samples increases continuously and tends to be stable gradually after reaching the “inflection point” at peak. The relationship between temperature rise effect on anthracite coal surface in an applied DC field and electrical parameters was discussed. The temperature rise process on anthracite coal surface is composed of three stages, namely, slowly warming, rapid warming and slow cooling to stabilize. The temperature rise effect on anthracite coal surface lags behind changes of currents which run through coal samples. There’s uneven temperature distribution on anthracite coal surface, which is attributed to the heterogeneity of coal samples. In the experiment, the highest temperature on anthracite coal surface 65.8 ℃ is far belower than the lowest temperature for pyrolysis-induced gas production of coals 200 ℃. This study lays foundations to study microstructural changes and relevant products on coal surface in an applied DC field.
format	article
author	Yunpeng Yang Zhihui Wen Leilei Si Xiangyu Xu
author_facet	Yunpeng Yang Zhihui Wen Leilei Si Xiangyu Xu
author_sort	Yunpeng Yang
title	Experimental study on variation law of electrical parameters and temperature rise effect of coal under DC electric field
title_short	Experimental study on variation law of electrical parameters and temperature rise effect of coal under DC electric field
title_full	Experimental study on variation law of electrical parameters and temperature rise effect of coal under DC electric field
title_fullStr	Experimental study on variation law of electrical parameters and temperature rise effect of coal under DC electric field
title_full_unstemmed	Experimental study on variation law of electrical parameters and temperature rise effect of coal under DC electric field
title_sort	experimental study on variation law of electrical parameters and temperature rise effect of coal under dc electric field
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a4c86998b79b478cb2bae092aa5784de
work_keys_str_mv	AT yunpengyang experimentalstudyonvariationlawofelectricalparametersandtemperatureriseeffectofcoalunderdcelectricfield AT zhihuiwen experimentalstudyonvariationlawofelectricalparametersandtemperatureriseeffectofcoalunderdcelectricfield AT leileisi experimentalstudyonvariationlawofelectricalparametersandtemperatureriseeffectofcoalunderdcelectricfield AT xiangyuxu experimentalstudyonvariationlawofelectricalparametersandtemperatureriseeffectofcoalunderdcelectricfield
_version_	1718391442637848576

Experimental study on variation law of electrical parameters and temperature rise effect of coal under DC electric field

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