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Effects of Pressurized Pyrolysis on the Chemical and Porous Structure Evolution of Coal Core during Deep Underground Coal Gasification
[Image: see text] During deep underground coal gasification, the semicoke produced by the pyrolysis of dense coal cores is an important material for its gasification and combustion. In this paper, pressurized pyrolysis experiments were carried out on dense coal cores at 700 °C and pressures of 1, 2,...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2023
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10620786/ https://www.ncbi.nlm.nih.gov/pubmed/37929149 http://dx.doi.org/10.1021/acsomega.3c03327 |
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author | Niu, Maofei Xin, Lin Cheng, Weimin Liu, Shuqin Wang, Bowei Xu, Weihao |
author_facet | Niu, Maofei Xin, Lin Cheng, Weimin Liu, Shuqin Wang, Bowei Xu, Weihao |
author_sort | Niu, Maofei |
collection | PubMed |
description | [Image: see text] During deep underground coal gasification, the semicoke produced by the pyrolysis of dense coal cores is an important material for its gasification and combustion. In this paper, pressurized pyrolysis experiments were carried out on dense coal cores at 700 °C and pressures of 1, 2, and 3 MPa using a shaft furnace. The resulting semicoke and raw coal were analyzed using the characterization methods such as the N(2) isothermal adsorption/desorption and scanning electron microscopy, Fourier transform infrared spectrometry (FTIR), and a pressurized thermogravimetric analyzer coupled with a FTIR spectrometer. The pyrolysis gas generation characteristics during pressurized pyrolysis were studied. The mechanisms of evolution of aliphatic functional groups and pore structures in semicoke during pressurized pyrolysis were revealed. The results indicate that the increase in pressure obviously changed the gas composition, most notably, the relative content of CH(4) and H(2) in the pyrolysis gas. The methane in the pyrolysis gas during pressurized pyrolysis of dense coal cores is mainly from the secondary reaction. As the pyrolysis pressure increased, the ratio of –CH(2)–/–CH(3) became smaller, indicating that the pressure promoted the breakage of the long fat chains. With the increase of the pyrolysis pressure, the surface deformation of pressurized pyrolysis semicoke increases, and the pore structure becomes more abundant. |
format | Online Article Text |
id | pubmed-10620786 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-106207862023-11-03 Effects of Pressurized Pyrolysis on the Chemical and Porous Structure Evolution of Coal Core during Deep Underground Coal Gasification Niu, Maofei Xin, Lin Cheng, Weimin Liu, Shuqin Wang, Bowei Xu, Weihao ACS Omega [Image: see text] During deep underground coal gasification, the semicoke produced by the pyrolysis of dense coal cores is an important material for its gasification and combustion. In this paper, pressurized pyrolysis experiments were carried out on dense coal cores at 700 °C and pressures of 1, 2, and 3 MPa using a shaft furnace. The resulting semicoke and raw coal were analyzed using the characterization methods such as the N(2) isothermal adsorption/desorption and scanning electron microscopy, Fourier transform infrared spectrometry (FTIR), and a pressurized thermogravimetric analyzer coupled with a FTIR spectrometer. The pyrolysis gas generation characteristics during pressurized pyrolysis were studied. The mechanisms of evolution of aliphatic functional groups and pore structures in semicoke during pressurized pyrolysis were revealed. The results indicate that the increase in pressure obviously changed the gas composition, most notably, the relative content of CH(4) and H(2) in the pyrolysis gas. The methane in the pyrolysis gas during pressurized pyrolysis of dense coal cores is mainly from the secondary reaction. As the pyrolysis pressure increased, the ratio of –CH(2)–/–CH(3) became smaller, indicating that the pressure promoted the breakage of the long fat chains. With the increase of the pyrolysis pressure, the surface deformation of pressurized pyrolysis semicoke increases, and the pore structure becomes more abundant. American Chemical Society 2023-10-17 /pmc/articles/PMC10620786/ /pubmed/37929149 http://dx.doi.org/10.1021/acsomega.3c03327 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Niu, Maofei Xin, Lin Cheng, Weimin Liu, Shuqin Wang, Bowei Xu, Weihao Effects of Pressurized Pyrolysis on the Chemical and Porous Structure Evolution of Coal Core during Deep Underground Coal Gasification |
title | Effects of Pressurized
Pyrolysis on the Chemical and
Porous Structure Evolution of Coal Core during Deep Underground Coal
Gasification |
title_full | Effects of Pressurized
Pyrolysis on the Chemical and
Porous Structure Evolution of Coal Core during Deep Underground Coal
Gasification |
title_fullStr | Effects of Pressurized
Pyrolysis on the Chemical and
Porous Structure Evolution of Coal Core during Deep Underground Coal
Gasification |
title_full_unstemmed | Effects of Pressurized
Pyrolysis on the Chemical and
Porous Structure Evolution of Coal Core during Deep Underground Coal
Gasification |
title_short | Effects of Pressurized
Pyrolysis on the Chemical and
Porous Structure Evolution of Coal Core during Deep Underground Coal
Gasification |
title_sort | effects of pressurized
pyrolysis on the chemical and
porous structure evolution of coal core during deep underground coal
gasification |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10620786/ https://www.ncbi.nlm.nih.gov/pubmed/37929149 http://dx.doi.org/10.1021/acsomega.3c03327 |
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