Large-scale laboratory study on the evolution law of temperature fields in the context of underground coal gasification

doi:10.1016/j.cjche.2020.07.005

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (12): 3126-3135.DOI: 10.1016/j.cjche.2020.07.005

• Energy, Resources and Environmental Technology • 上一篇下一篇

Large-scale laboratory study on the evolution law of temperature fields in the context of underground coal gasification

Zhe Wang^1,2, Yongchao Wei³, Tengfei Hou³, Yongchuan Jin^1,2, Cuilan Wang^1,2, Jie Liang^1,2

1 School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China;
2 Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology(Beijing), Beijing 100083, China;
3 Hebei Provincial Coalfield Geology Bureau Geophysical Prospecting & Survey Administration, Xingtai 054000, China

收稿日期:2019-11-23 修回日期:2020-07-06 出版日期:2020-12-28 发布日期:2021-01-11
通讯作者: Jie Liang
基金资助:
This work was supported by the National High Technology Research and Development Program of China (No. 2011AA050106) and Hubei Technological Innovation Special Fund (CN) (No.343-0402-YQN-TWEP).

Large-scale laboratory study on the evolution law of temperature fields in the context of underground coal gasification

Zhe Wang^1,2, Yongchao Wei³, Tengfei Hou³, Yongchuan Jin^1,2, Cuilan Wang^1,2, Jie Liang^1,2

1 School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China;
2 Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology(Beijing), Beijing 100083, China;
3 Hebei Provincial Coalfield Geology Bureau Geophysical Prospecting & Survey Administration, Xingtai 054000, China

Received:2019-11-23 Revised:2020-07-06 Online:2020-12-28 Published:2021-01-11
Contact: Jie Liang
Supported by:
This work was supported by the National High Technology Research and Development Program of China (No. 2011AA050106) and Hubei Technological Innovation Special Fund (CN) (No.343-0402-YQN-TWEP).

摘要/Abstract

摘要： This article presents the evolution law of temperature fields in a large-scale laboratory Underground Coal Gasification reactions using Ulanqab lignite under actual conditions. The results show that in the cultivation stage of oxidation zone, the main direction of the temperature field expansion is consistent with the crack direction of the coal seam. In the gasification stabilization stage, the main direction of the temperature field expansion is along the channel. The temperature of the coal seam and the overlying rock mass at its interface with the furnace directly above the gasification channel is equivalent to that of the coal seam temperature, and this temperature is much greater than the temperatures observed near both side walls of the gasification channel at the interface. However, temperatures perpendicular to the axis of the gasification channel are similar at a vertical distance of 40 cm away from the interface. The temperature distributions indicate that the transmission of heat through the overlying rock mass is more rapid in the vertical direction than in the horizontal direction. Moreover, some degree of thermal dispersion is observed in the vertical direction near the outlet. The thermal dispersion coefficient is 0.72 and dispersion angle γ is 78.7°.

关键词: Underground coal gasification, Temperature distribution, Coal seam crack, Gasification channel, Overlying strata

Abstract: This article presents the evolution law of temperature fields in a large-scale laboratory Underground Coal Gasification reactions using Ulanqab lignite under actual conditions. The results show that in the cultivation stage of oxidation zone, the main direction of the temperature field expansion is consistent with the crack direction of the coal seam. In the gasification stabilization stage, the main direction of the temperature field expansion is along the channel. The temperature of the coal seam and the overlying rock mass at its interface with the furnace directly above the gasification channel is equivalent to that of the coal seam temperature, and this temperature is much greater than the temperatures observed near both side walls of the gasification channel at the interface. However, temperatures perpendicular to the axis of the gasification channel are similar at a vertical distance of 40 cm away from the interface. The temperature distributions indicate that the transmission of heat through the overlying rock mass is more rapid in the vertical direction than in the horizontal direction. Moreover, some degree of thermal dispersion is observed in the vertical direction near the outlet. The thermal dispersion coefficient is 0.72 and dispersion angle γ is 78.7°.

Key words: Underground coal gasification, Temperature distribution, Coal seam crack, Gasification channel, Overlying strata

Zhe Wang, Yongchao Wei, Tengfei Hou, Yongchuan Jin, Cuilan Wang, Jie Liang. Large-scale laboratory study on the evolution law of temperature fields in the context of underground coal gasification[J]. 中国化学工程学报, 2020, 28(12): 3126-3135.

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Large-scale laboratory study on the evolution law of temperature fields in the context of underground coal gasification

Large-scale laboratory study on the evolution law of temperature fields in the context of underground coal gasification

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