煤层火灾严重威胁着矿井安全生产，可能引起瓦斯、煤尘爆炸，酿成人员伤亡的重大恶性事故。液态CO2 具有惰化、降温、抑爆及扩散范围大等特性，对煤层火灾防治和抑爆具有重要作用。但是，由于CO2 防治煤层自燃火灾的机理、应用工艺等关键科学问 题尚未得到很好解决，制约了CO2 在煤自燃火灾防治中的应用。本文围绕CO2 对煤自燃氧化反应过程的影响、采空区惰化降温区域及防灭火应用工艺等方面开展了深入研究。 应用WY-98A 型吸附常数测定仪研究了兖州矿区3#煤层煤样吸附特性，测定煤对CO2、N2 及CH4 单组分和双组分的吸附量，分析煤样对CO2 的吸附特性和影响因素，确定了CO2 对煤样吸附O2 量的影响关系；利用程序升温实验研究了煤样吸附CO2 后的自 燃特性参数，在不同浓度CO2 气氛下煤样升温过程中的耗氧特性，相比于空气气氛，加入CO2 后煤样活化能提高，降低了煤的氧化反应速率。 采用TG-DSC 联用技术研究了三种典型煤样在四种不同气氛、不同升温速率下的自燃氧化过程中煤样质量和能量变化，通过对TG、DTG 及DSC 曲线分析，计算得出了煤样氧化自燃反应动力学参数，确定了CO2 抑制煤氧化自燃的影响关系，即随着CO2 浓度的升高，煤氧化的表观活化能和指前因子加速减小，总体表现出反应速率减小，放热量减小。 针对综放面采空区实际条件，建立了采空区气体输运、能量交换模型，采用ANSYSFLUENT12.1 软件模拟采空区注入CO2 浓度场和温度场的变化过程，得出了采空区注入CO2 后，O 2 浓度、CO2 浓度、压力、速度和温度的动态分布规律，与现场观测结果基本相符。 建立了CO2 气-液两相管道输送热力学模型，利用Aspen HYSYS V7.3 软件模拟了CO2 在管道输送过程及影响因素，得出了输送距离与温度、压力、摩尔流量、内径相互之间的关系，确定了CO2 气-液两相管道稳定输送的相关参数；通过对液态CO2 汽化后管道输送过程模拟分析，确定出CO2 气态单相在管道输送的防灭火工艺参数。 开发了液态CO2 防治煤自燃的工艺及装备，建立了CO2 防治煤层自燃技术体系，在龙固矿综放面采空区自燃预防、平煤十二矿巷道穿采空区自燃火区及国宏化工厂原料煤仓火灾治理应用中，取得了良好的防灭火效果。

The coal seam fire is a serious threat of mine safety in production. Which can cause gas and coal dust explosion ， and major fatal accidents of casualties. The liquid carbon dioxide has the characteristics of inerting, cooling, explosion suppression and wide diffusion range etc., it plays a key role in coal seam fire prevention and explosion suppression. Due to the mechanism of carbon dioxide to control coal spontaneous combustion, application process and other key scientific issues have not been solved, which restrict the application of carbon dioxide in the coal seam spontaneous combustion fire prevention. This paper focuses on the characteristics of carbon dioxide for coal adsorption oxygen, spontaneous combustion oxidation reaction, the application process of fire prevention and control and other aspects conducted in-depth study. The adsorption characteristics of coal samples obtained from Yanzhou mining area 3# coal seam were tested by using WY-98 type adsorption constant detector. The adsorption capacity of one-component and multi-component of coal on CO2, N2 and CH4 were measured. The adsorption characteristics of carbon dioxide and influencing factors are analyzed. The influence factors of CO2 on coal samples absorption O2 amount are determined. The characteristic parameters of coal spontaneous combustion after coal samples absorption CO2 and oxygen exhaust characteristic of coal samples heating process in atmosphere of different CO2 concentrations are studied by temperature programmed experiment. Compared to air atmosphere, the activation energy is improved, the reaction rate of coal oxygen is reduced. The variable change of quality and energy of three typical coal samples in the process of oxidation were presented by TG-DSC hyphenated techniques under the condition of four different atmosphere and heating rates. Kinetic parameters of coal samples oxidation spontaneous combustion were obtained via the calculation and analysis of the TG, DTG and DSC curves. The influence factors of CO2 inhibition coal oxidation spontaneous combustion are determined, that is, with the rise of CO2 concentration, the apparentactivation energy and pre-exponential factor of coal oxidation accelerate reduction, the overall shows that the reaction rate lowers, the heat release reduces. Considering the actual conditions of fully mechanized caving face goaf, we created the model of goaf gas transport and energy exchange. Using Aspen HYSYS V7.3 stimulated the change process of goaf injection CO2 concentration field and temperature field, 0btained the dynamic distribution laws of O2 concentration, CO2 concentration, pressure, velocity and temperature after goaf injection of CO2. The results consistented with the field test observations. The study carries out a thermodynamic model of carbon dioxide gas-liquid two-phase pipeline transport. Using Aspen HYSYS V7.3 simulated the pipeline transmission and influencing factors of carbon dioxide, and obtained the relations of transmission distance and temperature, pressure, molar flow, inner diameter, determined the parameters of pipeline stable transmission of carbon dioxide gas-liquid two-phase; after vaporization of liquid carbon dioxide pipeline process simulation analysis to determine the process parameters of carbon dioxide gaseous single-phase pipeline of fire prevention. By analyzing the simulation of pipeline transport after liquid carbon dioxide vaporization, the process parameters of fire protection are determined. Fire prevention and control equipment of liquid carbon dioxide of coal seam spontaneous combustion is developed. The technological system of carbon dioxide control coal seam spontaneous combustion is established. The technologic is applied in Longgu coal mine fully mechanized caving face spontaneous combustion prevention，Pingmei 12 mine roadway wears the spontaneous combustion fire zone of gob and Guohong Chemical Plant raw coal bunker fire control technology, and obtained a good effect of fire prevention and control.