CO_(2)气化对单颗粒煤富氧燃烧特性影响实验研究  

Experimental Investigation of CO_(2) Gasification Reaction on Oxy-Fuel Combustion of Single Coal Particle

作　　者：李百航 刘敬樟[1] 朱建国[1,2] 马洪洲 劳世奇 LI Baihang;LIU Jingzhang;ZHU Jianguo;MA Hongzhou;LAO Shiqi(Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学资源与环境学院,北京100049

出　　处：《锅炉技术》2022年第1期37-42,共6页Boiler Technology

基　　金：国家自然科学基金项目(51406197)。

摘　　要：富氧燃烧技术作为一种实现CO_(2)减排的有效技术路线,是国内外的研究热点。高浓度CO_(2)气氛下,煤的氧燃烧特性与传统的空气燃烧存在极大区别。煤的燃烧在CO_(2)气化和O_(2)氧化的相互竞争中进行,而该竞争机制尚不明确。针对1 273 K的中温燃烧,选用单颗粒煤在竖直管式炉高温燃烧实验台上进行富氧气氛(27%O_(2)/73%CO_(2),体积分数)、O_(2)气氛(27%O_(2)/73%Ar,体积分数)和CO_(2)气氛(73%CO_(2)/27%Ar,体积分数)的燃烧实验并与空气气氛(21%O_(2)/79%N_(2),体积分数)燃烧进行对比,获取反应速率、颗粒表面温度随时间的变化关系。结果表明:中温富氧燃烧时,CO_(2)物理化学作用对单颗粒煤的碳消耗的贡献率为36.2%。中温燃烧时,CO_(2)的加入促进了碳氧燃烧,气化吸热对碳氧燃烧的影响相对较小。As an effective technology for reducing CO_(2)emission, oxy-fuel combustion is a research focus at home and abroad. In a high concentration of carbon dioxide atmosphere, oxy-coal combustion characteristics are of great differences with air combustion’s. In the oxy-fuel case, the coal is burning under the competition of carbon dioxide gasification and oxygen oxidation which is unclear now. In this paper, the produced coal particles were combusted with a temperature of 1 273 K in oxygen-enriched case(27%O_(2)/73%CO_(2)), oxygen case(27%O_(2)/73%Ar), carbon dioxide case(73%CO_(2)/27%Ar), comparing with air condition(21%O_(2)/79%N_(2)), obtaining the reaction rate, particle surface temperature changes over time. The results show that in oxygen combustion case with burning temperature of 1 273 K, the consumption ratio of carbon contributed by CO_(2)accounts for 36.2%. Carbon dioxide promotes the oxy-coal combustion, while the heat effect of gasification reaction on the oxy-coal combustion is relatively small.

关 键 词：气化反应 颗粒燃烧 富氧燃烧 反应速率 物理化学 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]