Modeling Coal Swelling during Pyrolysis at Elevated Pressure by Using a Single Bubble Model: Validation and Application
Pressurized oxy-coal combustion technologies are attracting more attention of researchers because of their advantages of carbon capture. While the ambient pressure could significantly influence the coal pyrolysis behavior. In this study, Yulin coal was used for the pyrolysis experiment in a pressuri...
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Published in | Combustion science and technology Vol. 195; no. 5; pp. 1138 - 1150 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
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New York
Taylor & Francis
04.04.2023
Taylor & Francis Ltd |
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Abstract | Pressurized oxy-coal combustion technologies are attracting more attention of researchers because of their advantages of carbon capture. While the ambient pressure could significantly influence the coal pyrolysis behavior. In this study, Yulin coal was used for the pyrolysis experiment in a pressurized drop tube furnace. Pyrolysis temperature of 1273 K, and pressures of 1, 4, 7, 10 atm were considered. The swelling behavior of produced char was analyzed by the scanning electron microscope (SEM). The char evolution process during pyrolysis at elevated pressure was simulated by a revised single bubble model, in which the volatile releasing rate and yield by residence time can be obtained from the CPD (chemical percolation devolatilization) model. Results show that the revised single bubble model is suitable for predicting the char evolution over a wide range of pressure and heating rate. Optimum pressure is present in the range of 7-15 atm, where the swelling ratio and porosity reach the maximum value. This model can predict the two regimes of coal swelling in varied heating rates, which is more obvious at high pressure. The porosity development by time can also be output, and the variation trends are similar to the swelling ratio. |
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AbstractList | Pressurized oxy-coal combustion technologies are attracting more attention of researchers because of their advantages of carbon capture. While the ambient pressure could significantly influence the coal pyrolysis behavior. In this study, Yulin coal was used for the pyrolysis experiment in a pressurized drop tube furnace. Pyrolysis temperature of 1273 K, and pressures of 1, 4, 7, 10 atm were considered. The swelling behavior of produced char was analyzed by the scanning electron microscope (SEM). The char evolution process during pyrolysis at elevated pressure was simulated by a revised single bubble model, in which the volatile releasing rate and yield by residence time can be obtained from the CPD (chemical percolation devolatilization) model. Results show that the revised single bubble model is suitable for predicting the char evolution over a wide range of pressure and heating rate. Optimum pressure is present in the range of 7–15 atm, where the swelling ratio and porosity reach the maximum value. This model can predict the two regimes of coal swelling in varied heating rates, which is more obvious at high pressure. The porosity development by time can also be output, and the variation trends are similar to the swelling ratio. Pressurized oxy-coal combustion technologies are attracting more attention of researchers because of their advantages of carbon capture. While the ambient pressure could significantly influence the coal pyrolysis behavior. In this study, Yulin coal was used for the pyrolysis experiment in a pressurized drop tube furnace. Pyrolysis temperature of 1273 K, and pressures of 1, 4, 7, 10 atm were considered. The swelling behavior of produced char was analyzed by the scanning electron microscope (SEM). The char evolution process during pyrolysis at elevated pressure was simulated by a revised single bubble model, in which the volatile releasing rate and yield by residence time can be obtained from the CPD (chemical percolation devolatilization) model. Results show that the revised single bubble model is suitable for predicting the char evolution over a wide range of pressure and heating rate. Optimum pressure is present in the range of 7-15 atm, where the swelling ratio and porosity reach the maximum value. This model can predict the two regimes of coal swelling in varied heating rates, which is more obvious at high pressure. The porosity development by time can also be output, and the variation trends are similar to the swelling ratio. |
Author | Shi, Zhaochen Chen, Chongming Tan, Houzhang Lu, Jie Wang, Xuebin Zhou, Ao Zhang, Jiaye |
Author_xml | – sequence: 1 givenname: Jiaye surname: Zhang fullname: Zhang, Jiaye organization: Moe Key Laboratory of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University – sequence: 2 givenname: Chongming surname: Chen fullname: Chen, Chongming organization: State Grid Hebei Electric Power Research Institute – sequence: 3 givenname: Jie surname: Lu fullname: Lu, Jie organization: China Nuclear Power Technology Research Institute – sequence: 4 givenname: Zhaochen surname: Shi fullname: Shi, Zhaochen organization: Moe Key Laboratory of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University – sequence: 5 givenname: Ao surname: Zhou fullname: Zhou, Ao organization: Moe Key Laboratory of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University – sequence: 6 givenname: Houzhang surname: Tan fullname: Tan, Houzhang organization: Moe Key Laboratory of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University – sequence: 7 givenname: Xuebin surname: Wang fullname: Wang, Xuebin email: wxb005@mail.xjtu.edu.cn organization: Moe Key Laboratory of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University |
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SubjectTerms | Carbon sequestration char porosity Coal Devolatilization Evolution Heating rate High pressure modeling coal swelling Percolation Porosity Pressure Pressurized pyrolysis Pyrolysis single bubble model Swelling ratio Tube furnaces |
Title | Modeling Coal Swelling during Pyrolysis at Elevated Pressure by Using a Single Bubble Model: Validation and Application |
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