Evolution of Micron-Scale Pore Structure and Connectivity of Lignite during Pyrolysis
Based on the high-precision microcomputed tomography (micro-CT) technology, the evolution of the μm-scale pore structure and connectivity of lignite during pyrolysis from room temperature to 600°C was studied. The results show that the pore connectivity of lignite increases with the increase of temp...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/9186542 |
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| author | Qiaorong Meng Yangsheng Zhao Zhiqin Kang Yong Wang Li Gao Yongfeng Zhang |
| author_facet | Qiaorong Meng Yangsheng Zhao Zhiqin Kang Yong Wang Li Gao Yongfeng Zhang |
| author_sort | Qiaorong Meng |
| collection | DOAJ |
| description | Based on the high-precision microcomputed tomography (micro-CT) technology, the evolution of the μm-scale pore structure and connectivity of lignite during pyrolysis from room temperature to 600°C was studied. The results show that the pore connectivity of lignite increases with the increase of temperature, and the change of pore structure can be divided into four stages: the first stage is from room temperature to 100°C, characterized by generation and connection of small-diameter pores. The second stage is 100–200°C, characterized by rapid expansion and interconnection of pores due to the thermal cracking. The third stage is from 200°C to 450°C, characterized by the slow evolution of pore structure for pyrolysis. The fourth stage is from 450°C to 600°C, characterized by pore interconnection for pyrolysis. 200°C is the temperature at which the μm-scale pore structure of lignite changes dramatically. During the whole pyrolysis process from room temperature to 600°C, the pore quantity of lignite is mainly from the pores of a diameter of 0.65–3 μm. At 200°C and above, the pore volume of lignite is mainly from the pores with a diameter larger than 100 μm, but they are few. These research results have important theoretical reference values for the upgrading and pyrolysis of lignite. |
| format | Article |
| id | doaj-art-933b2f698d1c4b6fbf3f0ef588add91a |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-933b2f698d1c4b6fbf3f0ef588add91a2025-02-03T01:04:37ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422020-01-01202010.1155/2020/91865429186542Evolution of Micron-Scale Pore Structure and Connectivity of Lignite during PyrolysisQiaorong Meng0Yangsheng Zhao1Zhiqin Kang2Yong Wang3Li Gao4Yongfeng Zhang5College of Mining Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, ChinaCollege of Mining Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, ChinaKey Laboratory of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Mining Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, ChinaCollege of Mining Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, ChinaCollege of Mining Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, ChinaBased on the high-precision microcomputed tomography (micro-CT) technology, the evolution of the μm-scale pore structure and connectivity of lignite during pyrolysis from room temperature to 600°C was studied. The results show that the pore connectivity of lignite increases with the increase of temperature, and the change of pore structure can be divided into four stages: the first stage is from room temperature to 100°C, characterized by generation and connection of small-diameter pores. The second stage is 100–200°C, characterized by rapid expansion and interconnection of pores due to the thermal cracking. The third stage is from 200°C to 450°C, characterized by the slow evolution of pore structure for pyrolysis. The fourth stage is from 450°C to 600°C, characterized by pore interconnection for pyrolysis. 200°C is the temperature at which the μm-scale pore structure of lignite changes dramatically. During the whole pyrolysis process from room temperature to 600°C, the pore quantity of lignite is mainly from the pores of a diameter of 0.65–3 μm. At 200°C and above, the pore volume of lignite is mainly from the pores with a diameter larger than 100 μm, but they are few. These research results have important theoretical reference values for the upgrading and pyrolysis of lignite.http://dx.doi.org/10.1155/2020/9186542 |
| spellingShingle | Qiaorong Meng Yangsheng Zhao Zhiqin Kang Yong Wang Li Gao Yongfeng Zhang Evolution of Micron-Scale Pore Structure and Connectivity of Lignite during Pyrolysis Advances in Materials Science and Engineering |
| title | Evolution of Micron-Scale Pore Structure and Connectivity of Lignite during Pyrolysis |
| title_full | Evolution of Micron-Scale Pore Structure and Connectivity of Lignite during Pyrolysis |
| title_fullStr | Evolution of Micron-Scale Pore Structure and Connectivity of Lignite during Pyrolysis |
| title_full_unstemmed | Evolution of Micron-Scale Pore Structure and Connectivity of Lignite during Pyrolysis |
| title_short | Evolution of Micron-Scale Pore Structure and Connectivity of Lignite during Pyrolysis |
| title_sort | evolution of micron scale pore structure and connectivity of lignite during pyrolysis |
| url | http://dx.doi.org/10.1155/2020/9186542 |
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