Characteristics of Airflow Reversal of Excavation Roadway after a Coal and Gas Outburst Accident

Junhong Si, Lin Li, Jianwei Cheng, Yiqiao Wang, Wei Hu, Tan Li and Zequan Li
Additional contact information
Junhong Si: School of Emergency Technology and Management, North China Institute of Science and Technology, Beijing 101601, China
Lin Li: School of Emergency Technology and Management, North China Institute of Science and Technology, Beijing 101601, China
Jianwei Cheng: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221008, China
Yiqiao Wang: School of Emergency Technology and Management, North China Institute of Science and Technology, Beijing 101601, China
Wei Hu: School of Emergency Technology and Management, North China Institute of Science and Technology, Beijing 101601, China
Tan Li: School of Emergency Technology and Management, North China Institute of Science and Technology, Beijing 101601, China
Zequan Li: School of Emergency Technology and Management, North China Institute of Science and Technology, Beijing 101601, China

Energies, 2021, vol. 14, issue 12, 1-13

Abstract: Determining the influence scope of the airflow disorder is an important problem after coal and gas outburst accidents in ventilation systems. This paper puts forward the indexes of airflow disorder, including the length of the excavation roadway, the outburst pressure, the pressure difference of the air door, and the air quantity of the auxiliary fan. Using the orthogonal table of L 9 (3 4 ) and numerical simulation method, the characteristics of airflow reversal are studied, and the outburst airflow reversal degree is calculated should the ventilation facility fail. Furthermore, on the basis of fuzzy comprehensive optimization theory, the comprehensive evaluation model of the airflow disorder is established. The results show that the length of the excavation roadway is the most important factor affecting the stability of the ventilation system, followed by the outburst pressure, pressure difference of the air door, and air quantity of the auxiliary fan. The influence of a gas outburst accident on the return air system is greater than that on the inlet air system, and a larger air velocity has a greater impact on the ventilation system, especially the air inlet part. Moreover, the airflow reversal degree of the ventilation system increases with the increase of the outburst pressure or decreases with the length of the excavation roadway. This paper provides a basis for the prevention of gas outburst accidents.

Keywords: airflow reversal; gas outburst; mine ventilation system; orthogonal experiment; numerical simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/1996-1073/14/12/3645/pdf (application/pdf)
https://www.mdpi.com/1996-1073/14/12/3645/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:14:y:2021:i:12:p:3645-:d:577711

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().