In order to fully understand coupling properties of low-concentration gas and pulverized coal

a coupling experimental system for ignition temperature was built up

and relevant experiments were carried out.The results illustrated that

the ignition temperatures of the coupling system was about 180 ℃lower than that of the low-concentration gas system.When the methane concentration was lower than 2%

the ignition temperature of the coupling system was lower than that of the pulverized coal system

while when the methane concentration was higher than 2%

the ignition temperature of the coupling system was higher than that of the pulverized coal system.The ignition temperature of the coupling system increased with the methane concentration.With an increase in the pulverized coal concentration

the ignition temperature of the coupling system reduced fist and then rose up.It increased by 110 ℃ when the coal particles diameter increased from the range of 65~70μm to 100~105μm

and decreased by 159℃ when the volatiles content in the coal changed from 8.99%to 30.99%.