氧气体积分数与升温速率对弱黏煤燃烧特性的影响 |
| |
引用本文: | 文虎,黄遥,张玉涛,李亚清. 氧气体积分数与升温速率对弱黏煤燃烧特性的影响[J]. 煤炭学报, 2017, 42(9): 2362-2368 |
| |
作者姓名: | 文虎 黄遥 张玉涛 李亚清 |
| |
作者单位: | 1.西安科技大学 安全科学与工程学院,陕西 西安 710054; 2.西部矿井开采及灾害防治教育部重点实验室,陕西 西安 710054 |
| |
基金项目: | 国家自然科学基金资助项目(51404192,51674191,51674191) |
| |
摘 要: | 采用热重实验研究氧气体积分数和升温速率对弱黏煤燃烧特性的影响,通过分析TG/DTG曲线得出样品的特征温度和反应速率,基于样品的特征温度和反应速率计算得到样品的燃烧特性参数。研究结果表明,改变氧气体积分数和升温速率对煤的着火温度影响不大,主要对煤的燃烧阶段产生影响。提高升温速率会延长煤的氧化反应历程,使煤各特征温度升高,并且增大煤的氧化反应速率;提高氧气体积分数会缩短煤的氧化反应历程,使煤各特征温度降低,并增大煤的氧化反应速率。在煤的氧化过程中,改变氧气体积分数和升温速率都能对煤的特征温度和燃烧特性参数造成影响,但氧气体积分数对他们的影响要大于升温速率造成的影响。
|
关 键 词: | 热重分析 TG/DTG曲线 特征温度 燃烧特性参数 |
收稿时间: | 2016-12-28 |
Effects of oxygen concentration and heating rate on the characteristics of bituminous coal combustion |
| |
Abstract: | Thermogravimetric analysis method was used to investigate the effects of oxygen concentration and heating rate on the characteristics of coal combustion.According to the TG-DTG graphs,characteristic temperatures and reaction rates were obtained.Furthermore,three combustion characteristic indexes were obtained on the basis of characteristic temperatures and the reaction rate.Experimental results indicate that the change of oxygen concentration and heating rate has little effect on the ignition of coal,which mainly affects the combustion stage of coal.With the increase of the heating rate,the oxidation reaction process of coal become longer,the characteristic temperature increased and the reaction rate of coal oxidation also increased.With the increase of oxygen concentration,the oxidation reaction process of coal become shorter,the characteristic temperature decreased and the reaction rate of coal oxidation also increased.In the process of coal oxidation,the changes of oxygen concentration and heating rate can affect the characteristic temperature and combustible parameter of coal,but the effect of oxygen concentration on them is greater than the effect of heating rate. |
| |
Keywords: | thermogravimetric analysis TG/DTG curve characteristic temperature combustible parameter |
本文献已被 CNKI 等数据库收录! |
| 点击此处可从《煤炭学报》浏览原始摘要信息 |
|
点击此处可从《煤炭学报》下载免费的PDF全文 |
|