| Aiming at the associated geological characteristics of kerosene in the northern part of Shaanxi Province,the roof slab rupture,stress redistribution,fracture development and development during the coal seam mining process,the immersion of crude oil into the coal body affects the actual engineering background of the mine fire prevention work,and the experimental study on the oxidation characteristics of oil immersed coal It has important theoretical significance and practical guidance value.This thesis uses theoretical and experimental methods,using temperature-programmed oxidation experiments,thermogravimetric analysis experiments and in-situ infrared spectroscopy experiments,combined with coal spontaneous combustion theory,coal chemistry and thermodynamics and other cross-over theory,from macroscopic to microscopic characterization,analysis of different oils The oxidation characteristics of the coal sample during the heating process are revealing the main influence of crude oil on the spontaneous combustion oxidation process of coal.?1?Based on the temperature-programmed oxidation experiment,the oil-impregnated coal marker gas was determined,and the oxygen consumption rate and exothermic intensity of different oil-to-oil ratio coal samples were given.The results show that the test temperature range?30°C190°C?has segmentation characteristics,crude oil immersed in the coal body,delaying the reaction process in the coal system;reference K value concept,using??CO?/k,??CO?/??CO2?,??C2H4?/k,predicting and predicting the degree of spontaneous combustion of coal according to the main and auxiliary indexes;the oxygen consumption rate of coal sample satisfies the exponential rising law with the increase of temperature.?2?Based on the thermogravimetric analysis experiment,the oxidation stages of the coal samples with different oil ratios and the characteristics of each stage are given,and the oxidation dynamic parameters generated by the oxidation process of the coal samples are solved.The results show that the oxidation process of different oil-to-oil ratios is roughly divided into five stages.The oxidation process of crude oil is roughly divided into three stages.The oil-to-oil ratio is increased,the oxygen absorption and weight-increasing stage of coal samples gradually disappears,and the kerosene oxygen three-phase reaction consumes The oxygen content increased,and the oil content showed a weight loss phenomenon than the 25%coal sample.Coats-Redfern method and Achar method were used to solve the different oil-to-oil ratio coal samples and crude oil oxidation kinetic parameters,and the oil-to-oil ratio,oxygen uptake,activation energy and oxidative combustion were analyzed.The impact of the characteristics.?3?Based on the in-situ infrared spectroscopy experiments,the evolution of aliphatic,aromatic and oxygen-containing functional groups with different oil-to-oil ratios as the temperature increases with temperature is given from the qualitative and semi-quantitative perspectives.The results show that the chemical reaction of coal sample at 260°C is violent,which can be used as the boundary point for the evolution of aliphatic,aromatic and oxygen-containing functional groups with different oil-to-oil ratios.The different peak positions of methyl and methylene groups in aliphatic group With the change of temperature,the C=C functional group on the 1625 cm-1 aromatic ring decreases first with temperature,and the C=C functional group on the aromatic ring of 1593 cm-1 increases with temperature;semi-quantitative from the longitudinal and lateral angles The evolution law of coal-like aliphatics with oil-to-oil ratio and temperature rise is given.The oil-free coal sample and oil-to-oil ratio 25%coal sample aromatic C=C satisfy polynomial changes;the change of oxygen-containing functional group C=O reveals the oil-to-oil ratio evaporation The gas desorption stage has little effect.Figure 35 table 13 reference 50... |
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