褐煤燃烧阶段烃生成规律研究

Study on generating rule of hydrocarbons at lignite combustion stage

为研究煤矿火灾时期烃生成规律,对褐煤进行热重分析和管式炉程序升温实验,得到不同温度下CH4,C2H6,C3H8,C2H4,C2H2及O2的体积分数。结果表明：褐煤燃烧阶段温度为247-433℃;CH4体积分数在348℃达到最大值,耗氧量及C2H6,C3H8,C2H4,C2H2体积分数在399℃达到最大值;CH4,C2H4,C3H8体积分数及耗氧量与温度呈近线性关系;C2H6,C2H2体积分数与温度呈指数关系;随着温度升高,（C2H6＋C3H8）/（CH4＋C2H6＋C3H8）比值升高,CH4/（CH4＋C2H6＋C3H8）比值、CH4/（C2H6＋C3H8）比值均降低,C2H6/CH4,C2H2/CH4和C3H8/C2H6比值与温度呈指数关系变化,可以作为预测火区燃烧状态判定指标。

In order to study generating rule of hydrocarbons during coal mine fire period,thermogravimetric analyses and programmed heating experiment of lignite were carried out,volume fractions of hydrocarbons at lignite combustion stage of CH4,C2H6,C3H8,C2H4,C2H2 and O2were measured. The results show that temperature range of lignite combustion stage is 247- 433 ℃,that volume fraction of CH4 reaches the maximum value at 348 ℃,the temperature at which oxygen consumption and volume fractions of C2H6,C3H8,C2H4,C2H2 reach the peak is 399 ℃,that oxygen consumption and volume fractions of CH4,C2H4 and C3H8show nearly linear relationships with temperature,and volume fractions of C2H6 and C2H2show exponential relations with temperature,and that with increasing temperature,（ C2H6＋ C3H8） /（ CH4＋ C2H6＋ C3H8） rises,CH4/（ CH4＋ C2H6＋ C3H8） and CH-4/（ C2H6＋ C3H8） decrease,and C2H6/ CH4,C2H2/ CH4 and C3H8/ C2H6 show exponent relationships with temperature,which can be used as an judgment index for forecasting combustion state of fire area.