Numerical simulation and disaster prevention for catastrophic fire airflow of main air-intake belt roadway in coal mine—A case study

Abstract

Coal mine belt fire develops very rapidly and is difficult to control. If not suppressed quickly, a belt fire could easily lead to airflow disorder and undermine the ventilation system. However, belt fire can be prevented effectively by establishing fire airflow control system. In this work, the 5th belt roadway of Kongzhuang coal mine was taken as the object of investigation, where geometrical models of this roadway were established firstly. Then, based on mathematical model of fire smoke flow, the CO volume fraction, smoke density distribution, air temperature and pollutant velocity vector in the roadway before and after taking airflow control measures were simulated by using Fluent software. It can be known from the simulation that with the normal ventilation status in 5th belt roadway, the countercurrent of smoke does not happen when a fire occurs; the roadway's section is almost filled with CO at 10 m downstream from the fire source, and with air velocity getting stable gradually, the CO concentration reaches about 15 %. After taking airflow control measures, the effect range of temperature field which are harmful to the miners decreases from 69 m to 30 m; and the distance of the roadway fully filled with CO is 5 m farther than that before taking measures. Finally, according to the numerical simulation results and the actual condition of the belt roadway, the warning and automatic remote airflow control system with short-circuit method for the 5th belt roadway was designed to guarantee the safety production.

Study on fire smoke flow characteristics in the ventilation network and linkage control system in coal mines

“…Mine exogenous fire has the characteristics of sudden occurrence and serious damage, which had killed dozens (or even hundreds) of miners worldwide. 1,2 The main factor for the heavy casualties is the spread of the smoke stream generated by the fire in the ventilation network. 3 Owing to the underground tunnel environment, narrow spaces, and complicated ventilation network, serious secondary disasters can be caused by disasters combining with each other.…”

“…16 A mine fire relief decision support system was developed and applied in the coal mine. 2 The casualties caused by fire accidents in coal mines over the last 5 years are shown in Table 1. ters should be further revealed.…”

“…Mine exogenous fire has the characteristics of sudden occurrence and serious damage, which had killed dozens (or even hundreds) of miners worldwide 1,2 . The main factor for the heavy casualties is the spread of the smoke stream generated by the fire in the ventilation network 3 .…”

“…The China University of Mining and Technology also developed Vent‐GIS, a visual simulation system for ventilation in coal mines 16 . A mine fire relief decision support system was developed and applied in the coal mine 2 . The casualties caused by fire accidents in coal mines over the last 5 years are shown in Table 1.…”

Type door rigid frame - pile arch system characteristics and disaster prevention application in thermodynamics

“…Two rows of anti-slide piles are arranged at the front and the back of the landslide, and they are connected by a beam to form a spatial anti-sliding structure with a beam-column combination. In [7][8][9][10][11][12], engineering examples, model tests, theoretical calculations, and numerical simulation studies have shown that gate-type anti-sliding piles are relatively rigid. Under the action of tie beams, the front and rear rows of piles jointly assume the landslide thrust and the Earth pressure around the pile effectively reduces the horizontal displacement of the pile, so that more landslide thrust is transmitted to the stable (anchor section) below the sliding surface through the axial force, so the gate type anti-slide pile limits the deformation of the slope.…”