摘要
为明确不同注氮条件对遗煤自燃的影响,利用矿井束管监测系统测得某工作面采空区“三带”范围,并采用Fluent模拟软件,建立该工作面采空区不同注氮条件下的自燃“三带”迁移模型,以确定最佳注氮位置、注氮温度、注氮流量,并在寸草塔二矿开展现场试验,验证该模型的科学性和有效性。结果表明:注氮出口位置距工作面30 m时,回风侧氧化带宽度最小值为25 m,注氮效果最佳;氧化带宽度随注氮流量的增加呈减小趋势,当注氮流量达到900 m3/h,对采空区氧化带范围整体控制效果较好;注氮气体温度越低,覆盖氧化带范围越广,且对采空区有一定降温效果;在该工作面开展注氮防灭火现场应用过程中,采空区氧化带最大宽度由40.4 m降低至15.2 m,氧化带最大宽度降低61.4%,防灭火效果显著。
In order to study the effect of different nitrogen injection conditions on the spontaneous combustion of residual coal,the three zones in the goaf of a working face were measured,with the beam tube monitoring system of mines utilized.A migration model for the three zones,which featured spontaneous combustion in the goaf of the working face under different nitrogen injection conditions,was established,and Fluent simulation software was adopted.The optimal nitrogen injection location,temperature,and flow rate were determined by the model.Field experiments were carried out at the Cuncaota No.2 mine,so as to verify the scientificity and effectiveness of the model.The results show that the nitrogen injection effect is the best when the outlet of nitrogen injection is 30 m from the working face.The minimum width of the oxidized zone on the wind return side is 25 m.In addition,the width of the oxidized zone decreases as the nitrogen injection flow rate increases.The oxidized zone in the goaf is better controlled when the flow rate reaches 900 m3/h.As the nitrogen injection temperature drops,the oxidized zone covers more areas and has a cooling effect on the goaf.During the field application of nitrogen injection for fire prevention in this working face,the maximum width of the oxidized zone is reduced from 40.4 m to 15.2 m.The maximum width of the oxidized zone is reduced by 61.4%,which indicates a significant effect on fire prevention.
作者
张晓旭
罗伙根
ZHANG Xiaoxu;LUO Huogen(Shendong Coal Cuntaota No.2 Mine,China Energy,Ordos Inner Mongolia 017209,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2022年第S02期131-135,共5页
China Safety Science Journal
关键词
注氮位置
注氮温度
注氮流量
防灭火
数值模拟
氧化带宽度
nitrogen injection location
nitrogen injection temperature
nitrogen injection flow rate
fire prevention
numerical simulation
width of oxidized zone
作者简介
张晓旭(1987—),男,辽宁抚顺人,本科,工程师,主要从事“一通三防”技术管理等方面的工作。E-mail:zhangxiaoxu06@126.com;罗伙根,高级工程师
