考虑热解产物组分的煤粉着火燃烧数学模型  

Mathematical Model of Pulverized Coal Ignition and Combustion Considering Various Pyrolysis Products

作　　者：齐永锋[1] 章明川[2] 于娟[2] 

机构地区：[1]扬州大学能源与动力工程学院,江苏扬州225127 [2]上海交通大学热能工程研究所,上海200240

出　　处：《上海交通大学学报》2013年第9期1358-1362,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金项目(51106133);江苏省自然科学基金项目(BK2010314);江苏省高校自然科学研究面上项目(10KJB470010;12KJB510032)资助

摘　　要：建立了球坐标系下考虑煤粉挥发分释放、传热、传质和化学反应全耦合的单颗粒热解、燃烧瞬态数值模型,并对陕西神木烟煤的着火、燃烧特性进行分析.结果表明,单颗粒煤粉的着火始于挥发分,且受氧气扩散速率的控制,挥发分火焰能够到达距颗粒中心约29倍颗粒半径的地方.当煤粉热解完成时,炭粒表面生成的CO被引燃,火焰退回炭粒表面附近而使炭粒快速升温,燃烧进入表面氧化反应控制状态.随着燃烧速率进一步提高,炭粒燃烧又开始受到表面还原反应的控制,火焰再次离开炭粒表面.The transient whole-coupling model in a spherical coordinate system on single pulverized coal py- rolysis and combustion was developed, taking into consideration various pyrolysis product release, heat transfer, mass transfe/＇, and chemical reactions. The igntion and combustion characteristics of Shenmu bi- tuminous coal were simulated. The result shows that the ignition of pulverized coal begins from volatiles, and the volatile flame can move rapidly to a position departing from the center of the coal particle by about 29 times radius, due to the limitation of oxygen diffusion; when the coal pyrolysis is completed, the CO generated by surface oxidation reaction has been ignited, the flame returns almost to the coke particle sur- face, the particle temperature rises abruptly, and the coke combustion is controlled by the surface oxida- tion reaction; with the combustion rate increasing, the coke combustion begins to be controlled by the sur- face reducing reaction, and the char flame departs from the particle surface again.

关 键 词：煤粉燃烧 瞬态模型 挥发分 炭粒 

分 类 号：TQ534[化学工程—煤化学工程]