| 基于热重-质谱联用的煤粉富氧燃烧动力学及污染物生成特性 |
| |
| 引用本文： | 刘倩,钟文琪,苏伟,贲昊玺.基于热重-质谱联用的煤粉富氧燃烧动力学及污染物生成特性[J].化工学报,2018,69(1):523-530. |
| |
| 作者姓名： | 刘倩 钟文琪 苏伟 贲昊玺 |
| |
| 作者单位： | 能源热转换及其过程测控教育部重点实验室, 东南大学能源与环境学院, 江苏 南京 210096 |
| |
| 基金项目： | 国家重点研发计划项目（2016YFB0600802）；国家自然科学基金项目（51676039）。 |
| |
| 摘 要： | 富氧燃烧是最具工业化前景的燃烧中碳捕集技术之一，为更深入掌握煤粉富氧燃烧的着火模式和污染物生成特性，本文构建了热重-质谱联用实验系统，以烟煤和无烟煤标准煤样为对象，针对3个不同的氧气体积分数：21%、30%和50%，研究了O2/Ar和O2/CO2气氛下煤粉的富氧燃烧特性。结果表明，O2/CO2气氛下煤粉着火温度和燃尽温度均降低，燃烧速率提高，燃烧时间缩短；两种煤粉在O2/Ar气氛下的燃烧都属于非均相着火，而富氧燃烧都属于均相着火模式；氧气体积分数在30%以上时，无烟煤O2/CO2燃烧的表观活化能明显低于O2/Ar气氛，在相同工况下烟煤的表观活化能均低于无烟煤；O2/CO2气氛促进了CO和挥发分NO的逸出，生成温度均低于O2/Ar气氛，CO会对NO起到还原作用。
|
| 关 键 词： | 煤燃烧 富氧燃烧 动力学 污染物 热重-质谱联用 |
| 收稿时间： | 2017-08-01 |
| 修稿时间： | 2017-09-13 |
Oxy-coal combustion kinetics and formation characteristics of pollutants based on TG-MS analysis |
| |
| LIU Qian,ZHONG Wenqi,SU Wei,BEN Haoxi.Oxy-coal combustion kinetics and formation characteristics of pollutants based on TG-MS analysis[J].Journal of Chemical Industry and Engineering(China),2018,69(1):523-530. |
| |
| Authors: | LIU Qian ZHONG Wenqi SU Wei BEN Haoxi |
| |
| Affiliation: | Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China |
| |
| Abstract: | Oxy-fuel combustion is one of the most promising CO2 capture technologies. The oxygen-enriched combustion of pulverized coal was simulated in a thermogravimetric analyzer coupled with a mass spectrometry (TG-MS) in order to understand the ignition model and the generation characteristics of pollutants during combustion. Bituminous and anthracite standard coals were selected as the samples. The tests were done with oxygen volume fractions of 21%, 30% and 50% with two kinds of atmospheres (O2/Ar and O2/CO2). In the O2/CO2 atmosphere, both of the ignition temperature and burnout temperature were lower, the combustion rate was improved, the combustion time was shortened, and the combustion performance was much better. Based on the TG/DTG curves, the ignition models of pulverized coal were judged. It was showed that the heterogeneous ignition of pulverized coal happened in O2/Ar atmosphere, while the homogeneous ignition occurred in O2/CO2 atmosphere. Also, the activation energy and pre-exponential factor of coal combustion were calculated by Coats-Redfern method. When the oxygen volume fraction was above 30%, the apparent activation energy of the anthracite coal combustion in O2/CO2 atmosphere was significantly lower than that in O2/Ar atmosphere, indicating an obvious improvement in reactivity. In the same reaction conditions, the activation energy of bituminous coal was lower than that of anthracite coal, and the former was more prone to ignition and combustion, showing better combustion performance. In the atmosphere of O2/CO2, the generation of CO and volatile-NO was promoted, and the formation temperature was lower than in O2/Ar atmosphere. Meanwhile, the abundant CO would lead to NO reduction reaction. |
| |
| Keywords: | coal combustion oxy-fuel combustion kinetics pollutants TG-MS |
|
| 点击此处可从《化工学报》浏览原始摘要信息 |
|
点击此处可从《化工学报》下载全文 |
|
