长焰煤贫氧燃烧放热特性参数实验研究  

Experimental Study on Exothermal Parameters of Long-flame Coal Combustion in Oxygen-depleted Air

作　　者：马李洋[1] 杨宇轩[1] 王晓霞[1] 易明浩 王文正[1] 王雁鸣[1] 

机构地区：[1]中国矿业大学安全工程学院,徐州221116

出　　处：《科学技术与工程》2016年第1期10-12,16,共4页Science Technology and Engineering

基　　金：中国矿业大学大学生创新创业基金立项大学生创新项目(201502);国家自然科学基金(51134020)资助

摘　　要：采用差示扫描量热(DSC)法测试了煤田火区和什托洛盖长焰煤在贫氧、不同氧浓度气氛下的氧化燃烧放热过程;并对热流曲线进行了分峰、积分处理;分析了长焰煤氧化燃烧的放热历程;研究了放热特性参数在贫氧不同氧浓度气氛下的变化规律;进而分析了氧气浓度对煤火空间演化过程的影响。研究表明,长焰煤燃烧放热过程主体分为以煤氧化学吸附和挥发分燃烧放热为主的放热阶段A,和以煤焦及半焦高温燃烧放热为主的放热阶段B。在贫氧条件下,随着氧气浓度的降低,阶段A和阶段B的峰值温度T_a和T_b逐渐升高,阶段A的放热量先增大后减小,并在16%时达到最大;阶段B的放热量逐渐减小。研究确定了16%氧气浓度为煤火空间演化的关键氧气浓度。Differential scanning calorimetry（ DSC） method was adopted to test the exothermic oxidation combustion process of long-flame coal from coal fire field of Heshentuoluogai under different oxygen concentration within the range of oxygen-depleted,and then sub-peak and integration process were conducted on the heat flow curve to analyze the exothermic oxidation combustion process of long-flame coal,the variation law of exothermic characteristic parameters under different oxygen concentration within the range of oxygen-depleted was obtained and the influence of oxygen concentration on coal fire space evolution was further analyzed. The research results show that the combustion exothermic process of long-flame coal can mainly be divided into two stages： Exothermic stage A which is mainly characterized by oxygen chemical adsorption and volatile combustion heat of coal,and Exothermic stage B which is mainly characterized by the combustion heat release under high temperature of coal and char. The peak temperature T_a of stage A and T_b of stage B gradually increased with the decrease of oxygen concentration under oxygen-delpleted condition,the heat release of stage A was first increased but then decreased among which the peak point of oxygen concentration is at 16%,the heat release of stage B gradually dropped. Thus,the oxygen concentration of 16% can be determined to be the critical oxygen concentration for coal fire space evolution.

关 键 词：地下煤火 贫氧 氧气浓度 燃烧 放热特性 

分 类 号：O612.4[理学—无机化学] TD752[理学—化学]