Influence of water content on the oxidizing properties of oil and gas associated coal after thermostatic pyrolysis
In order to reveal the evolution rule of oxidation characteristics of coal samples with different water content of oil and gas accompanied by constant temperature pyrolysis,the programmed heating test was used to determine the characteristic temperature and dry cracking temperature point of the coal samples,analyzing the gas generation rate,oxygen consumption rate,and exothermic intensity during the oxidation process of coal samples with varying water content after constant-temperature pyrolysis treatment from a macroscopic perspective.The apparent activation energy values of three stages of the oxidation reaction,namely,A(30～70℃),B(70～110℃),and C(110～170℃),were calculated in sections.The results show that the critical temperature of raw coal oxidation heating process is around 70℃,and the dry cracking temperature is around 110℃;During the oxidation process of coal samples with different water contents,the oxygen consumption rate and exothermic intensity increase slowly be-fore 110℃,and sharply after 110℃.Moreover,the oxygen consumption rate and heat release intensity of raw coal are greater than those of high water coal samples;The water content after pyrolysis treat-ment in stage A of the oxidation reaction promotes the oxidation reaction of coal samples,while in stage B of the oxidation reaction,the difference in apparent activation energy values of coal samples with dif-ferent water contents is relatively small;In stage C of oxidation reaction,as the water content increa-ses,15%and 20%water contents have an inhibitory effect on coal spontaneous combustion,while high water content coal samples have a low tendency for spontaneous combustion.The findings of the study are of guide meaning for the control of spontaneous combustion fires in oil and gas associated coal.
water contentpyrolysisoxygen consumption rateexothermic intensityapparent activation energy
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