Influence of air amount on index gas for lignite combustion
ZHOU Xihua
WANG CHENG
LI Ang
BAI Gang
GUO Xiaoyang
Abstract：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.
Keywords：lignite combustionthermo gravimetric testprogram temperature risegray correlation degree
Publication Date：2017-01-01