Coal char characteristics variation in the gasification process and its influencing factors
Underground coal gasification is a burgeoning coal exploitation technique that coal is directly converted into gaseous fuel by controlled combustion. In this paper, the gasification experiments of Inner Mongolia lignite, Xinjiang subbituminous coal, and Hancheng medium volatile bitumite were conduct...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2020-09-01
|
| Series: | Energy Exploration & Exploitation |
| Online Access: | https://doi.org/10.1177/0144598720935523 |
| _version_ | 1819172467918241792 |
|---|---|
| author | Zhenyong Yin Hao Xu Yanpen Chen Tiantian Zhao |
| author_facet | Zhenyong Yin Hao Xu Yanpen Chen Tiantian Zhao |
| author_sort | Zhenyong Yin |
| collection | DOAJ |
| description | Underground coal gasification is a burgeoning coal exploitation technique that coal is directly converted into gaseous fuel by controlled combustion. In this paper, the gasification experiments of Inner Mongolia lignite, Xinjiang subbituminous coal, and Hancheng medium volatile bitumite were conducted respectively by using the tube furnace coal gasification experiment system. The gasification process was conducted under 3°C/min increment within the range of 600–900°C. The gas composition was analyzed by gas chromatography and the pore structure of the coal char was detected by low-temperature N 2 adsorption. The results show that the gasification temperature, gasification agent, and coal type have an important influence on the gasification reaction. With the increase of gasification temperature, the effective component, gas calorific value, and gas production rate increase. When CO 2 is used as the gasifying agent, the effective components in the gas are mainly CO. When H 2 O(g) is used as the gasifying agent, the effective component of gas is H 2 . The coal gasification performance with low thermal maturity is obvious better than the high rank coal with higher coalification. N 2 adsorption–desorption experiments show that the pore is mainly composed by transition pore and the micropores, the specific surface area is chiefly controlled by a pore size of 2–3 nm. With the increase of coalification degree, the adsorption amount, specific surface area, and total pore volume show a decreasing trend. The gasifying agent has a great influence on the pore structure of the coal char. The gasification effect of H 2 O (g) is significantly better than that of CO 2 . Analyzing the gasification characteristics and pore changes of different coal rank coals under different gasification agents, we found that Inner Mongolia lignite is more conducive to the transport of gasification agents and gaseous products in coal. |
| first_indexed | 2024-12-22T20:07:39Z |
| format | Article |
| id | doaj.art-c0858f68daa442c383bd7da30a6262a1 |
| institution | Directory Open Access Journal |
| issn | 0144-5987 2048-4054 |
| language | English |
| last_indexed | 2024-12-22T20:07:39Z |
| publishDate | 2020-09-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Energy Exploration & Exploitation |
| spelling | doaj.art-c0858f68daa442c383bd7da30a6262a12022-12-21T18:14:06ZengSAGE PublishingEnergy Exploration & Exploitation0144-59872048-40542020-09-013810.1177/0144598720935523Coal char characteristics variation in the gasification process and its influencing factorsZhenyong YinHao XuYanpen ChenTiantian ZhaoUnderground coal gasification is a burgeoning coal exploitation technique that coal is directly converted into gaseous fuel by controlled combustion. In this paper, the gasification experiments of Inner Mongolia lignite, Xinjiang subbituminous coal, and Hancheng medium volatile bitumite were conducted respectively by using the tube furnace coal gasification experiment system. The gasification process was conducted under 3°C/min increment within the range of 600–900°C. The gas composition was analyzed by gas chromatography and the pore structure of the coal char was detected by low-temperature N 2 adsorption. The results show that the gasification temperature, gasification agent, and coal type have an important influence on the gasification reaction. With the increase of gasification temperature, the effective component, gas calorific value, and gas production rate increase. When CO 2 is used as the gasifying agent, the effective components in the gas are mainly CO. When H 2 O(g) is used as the gasifying agent, the effective component of gas is H 2 . The coal gasification performance with low thermal maturity is obvious better than the high rank coal with higher coalification. N 2 adsorption–desorption experiments show that the pore is mainly composed by transition pore and the micropores, the specific surface area is chiefly controlled by a pore size of 2–3 nm. With the increase of coalification degree, the adsorption amount, specific surface area, and total pore volume show a decreasing trend. The gasifying agent has a great influence on the pore structure of the coal char. The gasification effect of H 2 O (g) is significantly better than that of CO 2 . Analyzing the gasification characteristics and pore changes of different coal rank coals under different gasification agents, we found that Inner Mongolia lignite is more conducive to the transport of gasification agents and gaseous products in coal.https://doi.org/10.1177/0144598720935523 |
| spellingShingle | Zhenyong Yin Hao Xu Yanpen Chen Tiantian Zhao Coal char characteristics variation in the gasification process and its influencing factors Energy Exploration & Exploitation |
| title | Coal char characteristics variation in the gasification process and its influencing factors |
| title_full | Coal char characteristics variation in the gasification process and its influencing factors |
| title_fullStr | Coal char characteristics variation in the gasification process and its influencing factors |
| title_full_unstemmed | Coal char characteristics variation in the gasification process and its influencing factors |
| title_short | Coal char characteristics variation in the gasification process and its influencing factors |
| title_sort | coal char characteristics variation in the gasification process and its influencing factors |
| url | https://doi.org/10.1177/0144598720935523 |
| work_keys_str_mv | AT zhenyongyin coalcharcharacteristicsvariationinthegasificationprocessanditsinfluencingfactors AT haoxu coalcharcharacteristicsvariationinthegasificationprocessanditsinfluencingfactors AT yanpenchen coalcharcharacteristicsvariationinthegasificationprocessanditsinfluencingfactors AT tiantianzhao coalcharcharacteristicsvariationinthegasificationprocessanditsinfluencingfactors |