CAJ | 학술논문

为了研究粒径对松散煤体自燃的影响，利用自制试验装置对松散煤体进行了绝热低温氧化试验。在试验过程中，对煤样的温度及试验装置出口氧体积分数进行监测，得到了各煤样的氧化升温及耗氧规律。研究结果表明，总体上煤样的平均氧化升温速率和在同一温度下的耗氧速率随煤样粒径的增加而减小，耗氧及温升拐点出现也较晚；煤样粒径与拐点温度近似呈对数函数关系，与拐点出现时间近似呈二次抛物线函数关系；混合煤样的氧化升温过程受其比表面积和空隙率的共同影响，粒径越小，空隙率对混合煤样氧化升温的影响比重越大；混合煤样加权粒径越小，各粒径煤样间的相互影响越强；混合煤样中各煤样间的粒径差距越大，煤样间的相互影响越弱。
위료연구립경대송산매체자연적영향，이용자제시험장치대송산매체진행료절열저온양화시험。재시험과정중，대매양적온도급시험장치출구양체적분수진행감측，득도료각매양적양화승온급모양규률。연구결과표명，총체상매양적평균양화승온속솔화재동일온도하적모양속솔수매양립경적증가이감소，모양급온승괴점출현야교만；매양립경여괴점온도근사정대수함수관계，여괴점출현시간근사정이차포물선함수관계；혼합매양적양화승온과정수기비표면적화공극솔적공동영향，립경월소，공극솔대혼합매양양화승온적영향비중월대；혼합매양가권립경월소，각립경매양간적상호영향월강；혼합매양중각매양간적립경차거월대，매양간적상호영향월약。
In order to find out the regularities of particle size influencing loose coal spontaneous combustion, adiabatic experiments of low temperature oxidation on loose coal were designed,based on a self-developed device. The temperature of coal samples and the oxygen volume fraction at device outlet were observed in the experiments. The regularities of temperature rise and oxygen consumption were obtained. The results show that the average valueof oxidation heating rate and that of the oxygen consumption rate at the same temperature of loose coal with composite particle size were inversely proportional to the coal particle size on the whole,that the occurrence of the knee points of the oxygen consumption and the temperature rise were late with the increase of coal particle size,that the relation-ship between the particle size of coal and the temperature of knee point is a logarithmic function,and that the rela-tionship between the particle size of coal and the occurrence of the knee point is a parabolic function. The oxidation process of loose coal with composite particle size is affected by its porosity and specific surface area. The effect pro-portion of porosity is inversely proportional to the coal particle size. When the weighted size of loose coal is smaller, the interrelationship of coal samples is stronger. With the difference of particle size between coal samples becoming larger,the interrelationship of coal samples becomes weaker.