二次氧化煤燃烧和灭火过程的实验研究
Experimental study on combustion and extinguishing of secondary oxidation coal
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摘要: 采空区遗煤属于二次氧化煤,遗煤自燃严重威胁着煤矿安全生产。 氮气可作为灭火剂对 遗煤自燃进行抑制。 为研究氮气对二次氧化煤的影响,本文采用了热重分析和程序升温系统分 别对升温过程和灭火过程进行了实验与分析。 在升温过程中,随着氮气浓度的增加,特征温度均 有所上升,氮气对二次氧化煤的燃烧具有抑制作用。 在降温灭火过程中,以温度和指标气体CO 浓度作为监测参数,对其灭火效果进行实验。 分析发现,在程序升温到400℃的二次氧化煤中通 入氮气与空气的混合气体,当氮气与空气的体积比为50% /50% 时,较自然降温的时间节约了 38.0% ,CO浓度降至0所需的时间减少了42.1% 。 氮气浓度越高,二次氧化煤的灭火时间越快, 生成的产物越少,灭火效果越好。Abstract: Thespontaneouscombustionofcoalinthegoaf,whichbelongstosecondaryoxidationcoal seriouslythreatens the safe production of coal mines.Nitrogen can be used as a fire extinguishing agenttoinhibitspontaneouscombustionofresidualcoal.Inordertostudytheeffectofnitrogenonsecondary oxidation coal,thermogravimetric analysis and temperature programmed system are used to carryoutexperimentsonandanalysisofheatingprocessandextinguishingprocess.Duringtheheating process,astheconcentrationofnitrogenincreased,thecharacteristictemperaturesincreased,andnitrogen inhibited the combustion of secondary oxidation coal.In the process of cooling and extinguishingfire,thetemperatureandindicatorgasCOconcentrationwereusedasmonitoringparameterstotestthefireextinguishingeffect.Theanalysisshowsthatwhenamixtureofnitrogenandair withtheratioof50% /50%,wasintroducedintothesecondaryoxidationcoalprogrammedto400℃, thetimewasreducedby38.0% comparedwiththenaturaltemperaturedrop,alsothetimeforCO concentrationtodropto0wasshortenedby42.1%.Thehigherthenitrogenconcentration,theshorter thefire-extinguishingtimeofthesecondaryoxidationcoal,andthelesstheproductproduced,thebetterthefire-extinguishingeffect.
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