Tan Bo, Li Xiaomeng, Zhang Xuedong, Zhang Zhaolun, Zhang Heyu
School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China.
ACS Omega. 2022 Jan 14;7(4):3359-3368. doi: 10.1021/acsomega.1c05528. eCollection 2022 Feb 1.
Coal bunkers are relatively closed systems. Due to their own oxidation characteristics and the increase of temperature, spontaneous combustion will occur beyond the spontaneous combustion period. Moreover, spontaneous combustion of coal bunkers is a disaster caused by multifield coupling, so it is imperative to carry out inerting fire prevention and fire extinguishing. Based on this fact, combined with the actual situation in Huanghua Port, this paper establishes a two-dimensional geometric model of a coal bunker, selects CO as the inert gas sprayed in the coal bunker, determines the position of the inert gas port of the coal bunker hopper, and studies the influence of fireproof and fire-extinguishing inerting on coal bunker inerting. The results show that the arrangement of the inert gas port of the bunker hopper outside the bunker is more conducive to the diffusion of CO gas in the bunker. In about 35-41 days, the inerting temperature decreases slowly between 345 and 350 K. After 41 days, the maximum temperature of the coal bunker decreases rapidly and the spontaneous combustion of the coal bunker is completely controlled. Under the preset conditions, the best fire inerting time is 32.3 days after coal storage.
煤仓是相对封闭的系统。由于其自身的氧化特性以及温度升高，超过自燃期就会发生自燃。而且，煤仓自燃是多场耦合导致的灾害，因此进行惰化防火灭火势在必行。基于这一事实，结合黄骅港的实际情况，本文建立了煤仓的二维几何模型，选择CO作为向煤仓内喷射的惰性气体，确定了煤仓漏斗惰性气体端口的位置，并研究了防火灭火惰化对煤仓惰化的影响。结果表明，煤仓漏斗惰性气体端口布置在仓外更有利于CO气体在仓内扩散。在大约35 - 41天内，惰化温度在345至350 K之间缓慢下降。41天后，煤仓最高温度迅速下降，煤仓自燃得到完全控制。在预设条件下，最佳防火惰化时间为储煤后32.3天。
