科研之友
微信
新浪微博
Facebook
分享链接
摘要
The majority of gassy mines in China have been located in hilly areas, and distributed surface wells are widely used to recover the methane for mining safety and commercial purposes. However, a large amount of low concentration methane from distributed wells cannot be directly transported due to its high explosion risk, and have to be emitted into the atmosphere, resulting in air pollution and wasting energy. Conventional pressure swing adsorption (PSA) methods are mainly employed to increase the methane concentration for safe transportation. However, they typically adopt large-scale factory mode, which is not effective due to the lack of industrial land for distributed wells. In this study, an efficient approach is proposed to address the low concentration methane emission of distributed wells by designing a distributed purification system, including the units of security drainage, PSA purification, and pressurization. Low concentration methane was initially extracted by the security drainage unit, and then, its concentration was increased in the PSA purification unit. Eventually, after being pressurized in the pressurization unit, the methane parameters can meet the safety requirements of the long distance transportation. Field application of the system was carried out in Sihe Coal Mine in China. The results show that, after purification, the concentration of methane is stable at more than 60%, while the concentration of oxygen was remarkably decreased, and the methane recovery percentage is stable at more than 80%. The total profit of decade is 10936 kY, and the average daily usable methane volume is 2857.39 m(3) as well, which would reduce greenhouse emissions equal to approximately 60.01 km(3) carbon dioxide.
- 出版日期2018-10-3
- 单位太原理工大学
