褐煤燃烧阶段风量对指标气体的影响

以平庄瑞安褐煤为研究对象,通过热重试验确定褐煤燃烧阶段温度范围,利用管式炉程序升温系统进行煤样氧化自燃试验,得到风量分别为40、80、120、160和200 m L/min条件下的气体;为确定优选指标气体的关联度大小,采用灰色关联法对其进行分析。结果表明:褐煤燃烧阶段温度为247~433℃,408℃左右达到快速燃烧状态。当风量恒定时,CO_2/ΔO_2、CO/ΔO_2、C_2H-4与温度的关联度比CO、C_2H_6、C_2H_4/C_2H_6高。随风量不断增加,指标气体与温度的关联度:CO_2/ΔO_2最大,其次是CO/ΔO_2、C_2H_4和CO,C_2H_6和C_2H_4/C_2H_6最小。故可将CO_2/ΔO_2、CO/ΔO_2和C_2H_4作为主要指标,CO作为辅助指标用于预测煤矿井下封闭火区燃烧状态。

Influence of air amount on index gas for lignite combustion

Brown coal of Pingzhuang at Ruian was taken as the sample,the temperature range of the coal during combustion stage was determined by thermo gravimetric test,and the spontaneous combustion experiment was carried out by using tube furnace heating system.Gases were obtained at 40,80,120,160 and 200 mL/min of air volume respectively.In order to determine the correlation degree of the optimal index gas,the gray correlation method was used to analyze the gas.The results show that the temperature of the lignite combustion stage is 247-433 ℃,and the rapid combustion state is achieved at about 408 ℃.When the air volume is constant,the correlation degree of temperature of CO2/ΔO2,CO/ΔO2 and C2H4 is higher than that of CO,C2H6 and C2H4/C2H6.With the increase of air volume,the correlation between gas and temperature is:CO2/ΔO2 is the largest,followed by CO/ΔO2,C2H4 and CO,C2H6 and C2H4/C2H6 are the smallest.So CO/ΔO2,CO/ΔO2 and C2H4 can be used as the main quota,CO is used to predict the coal mine closed fire zone combustion status.