The characteristics of low temperature oxidation reaction of coal and the effect of waste flue gas on low temperature oxidation reaction of coal in closed coal yard were investigated.The results show that

under the conventional coal storage way

the Mongolian coal's calorific value was reduced by 14.59% and15.87%respectively after 48hours' and 96hours' low temperature oxidation at 100 ℃

indicating this way has better oxygen supply condition and is not suitable to store coals with spontaneous combustion tendency.When the closed coal yard was applied and with full storage

the Mongolian coal's calorific value was reduced by only 6.8%and 8.35%respectively after 48hours' and 96hours' low temperature oxidation at 100 ℃

indicating this way can inhibit the low-temperature oxidation of coal to a certain extent.But the inhibitory effect was limited when the closed coal yard is no full filled.When the closed coal yard was filled with waste flue gas

the Mongolian coal's calorific value was reduced by only 3.78%and 5.8%respectively after 48hours' and 96hours' low temperature oxidation at 100 ℃

indicating this way can inhibit the low temperature oxidation reaction effectively.The waste gas not only can convert waste to useful resources and reduce inert gas cost

but also can ensure the operation safety of coal with spontaneous combustion tendency in the closed coal yard

since it can reduce the amount of air in the closed yard and isolate the outside air to inhibit the low temperature oxidation reaction of coal.