Comparative experiment study on fire prevention and extinguishing in goaf by N 2 -water mist and CO 2 -water mist
- PDF / 2,933,154 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 63 Downloads / 235 Views
ORIGINAL PAPER
Comparative experiment study on fire prevention and extinguishing in goaf by N2-water mist and CO2-water mist Fei Wang 1,2 & Hongwei Liu 1,2 Received: 25 August 2019 / Accepted: 9 July 2020 # Saudi Society for Geosciences 2020
Abstract In order to compare and analyze the fire prevention and extinguishing effect of N2-water mist and CO2-water mist in goaf, the TG-DTG-DSC thermal analysis experiment of inhibiting coal combustion and the experiment of extinguishing burning residual coal in goaf by N2/CO2-water mist were carried out. In the thermal analysis experiment of 20~850 °C, N2/CO2-water mist increased the pyrolysis temperature T2 and the ignition temperature T3, decreased the combustion mass loss of the whole process, decreased the amount of endothermic at the early stage and exothermic at the later stage of the reaction, and the effect of CO2water mist was more obvious. For the burning residual coal in a large scale of goaf, N2/CO2-water mist decreased the temperature, the amount of CO, CO2, H2, and the consumption of O2, and the effect of CO2-water mist was better than that of N2-water mist. Although N2/CO2-water mist could inhibit CH4 emission, there was no significant difference between them. There was no reignition after stopping the application of N2/CO2-water mist. Keywords Mine goaf fire . N2/CO2-water mist fire prevention and extinguishing technology . TG-DTG-DSC experiment . Fire extinguishing experiment
Introduction Coal mine fire is one of the five major disasters in coal mine, and coal spontaneous combustion is the main cause of coal mine fire. More than 50% of China’s coal mines are at risk of spontaneous combustion. Mine spontaneous combustion accounts for 94% of the total number of mine fire, and the spontaneous combustion of residual coal in goaf accounts for 60% of spontaneous combustion (Liang et al. 2016). The occurrence of fire in goaf will not only consume coal resources, burn mechanical equipment, but also cause explosion of gas and coal dust (Liu et al. 2019), form high-temperature flame, and generate a large amount of toxic and harmful gases (Guo et al. 2019a), which seriously threaten the life safety of underground workers (Guo et al. 2018). In order to prevent Responsible Editor: Murat Karakus * Fei Wang [email protected] 1
College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
Center of Shanxi Mine Safety for Graduate Education Innovation, Taiyuan 030024, China
and control mine goaf fire, many techniques have been put forward since 1950, such as pressure equalizing (Zhu et al. 2013), grouting (Xu et al. 2012), inert gas (Liu and Wang 2019a; Singh et al. 2007), inhibitor (Yang et al. 2014), gel (Cheng et al. 2017), and three-phase foam (Tripathi 2008; Qin et al. 2014) fire prevention and extinguishing technologies. However, all these technologies have their own disadvantages and limitations (Liu and Wang 2019b). On the basis of these technologies, Liu et al.(Liu and Wang 2019b; Wang and Liu 2016) propos
Data Loading...
