封闭煤场煤堆内的气体流动特性

Gas Flow Characteristics in Coal Stockpile of Closed Coal Yard

占地面积小、场地利用率高、污染少的封闭煤场成为当下新兴的储煤方式,而煤场结构造成的"烟囱效应"及煤低温氧化产生的热压差作用将促使空气进入封闭煤场,对于煤炭的低温氧化反应有促进的作用,试验结果表明由于堆煤时造成的煤颗粒粒径分布不均匀,煤堆四周边缘区域的颗粒粒径较大,气体在粗颗粒中的流动摩擦阻力较小,因此,气体进入煤堆后容易向颗粒相对较粗的区域流动,促进局部区域煤的低温氧化反应甚至自燃,因此,研究气体在封闭煤场中的流动特性对于预判煤堆中可能自燃的区域及进行有针对性充惰保护具有重要意义。

Small occupation area, high site utilization, less pollution of closed coal yard has becoming the current emerging coal storage mode, but the ＇chimney effect＇ caused by its structure and thermal effect caused by low-temperature oxidation of coal will force air into closed coal yard, facilitate the low-temperature oxidation of coal. The result shows that uneven distribution of coal particle size is caused by coal heaping, the larger size particle around the coal stockpile edge reg!on, gas flow friction is smaller in the coarse particles. Therefore, gas is easily flow into the relative coarse particles area, promote the low-temperature oxidation of local area even to spontaneous combustion, therefore, study on gas flow characteristics of closed coal yard for predict possible spontaneous combustion area of coal stockpile and targeted inerting protection is significantly.