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作 者:康志忠[1] 丁先 KANG Zhizhong;DING Xian(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)
机构地区:[1]华北电力大学能源动力与机械工程学院,北京102206
出 处:《动力工程学报》2020年第3期183-190,共8页Journal of Chinese Society of Power Engineering
基 金:国家科技支撑计划资助项目(2015BAA04B02)。
摘 要:利用CHEMKIN软件对烟气中钠反应机理进行简化,将优化后的32步基元反应与CFD软件结合,并对某为全烧准东煤而设计的旋流燃烧器进行了模拟分析。结果表明:该燃烧器运行中存在长轴为3m、短轴为1.5m的椭圆形稳定回流区;火焰呈"风包火"花瓣状,且在回流区后存在稳定的火焰区;在准东煤燃烧过程中,各种含钠物质分布空间和体积分数存在明显差异,在火焰区主要以Na(体积分数为30%)、Na2SO4(体积分数为25%)、NaCl(体积分数为20%)和NaOH(体积分数为10%)形式存在,而在燃烧室出口主要以Na2SO4(体积分数为43%)、NaCl(体积分数为30%)和Na2Cl2(体积分数为24%)3种形式赋存;钠迁移行为大致可分为钠释放阶段(0.28~0.37 s)、快速反应阶段(<0.37~0.95 s)及Na2SO4生成阶段(0.95 s以后)3个阶段。CHEMKIN software was used to simplify the reaction mechanism of sodium in flue gas, and then the simplified 32-step elemental reactions and CFD software were combined to simulate and analyze a swirl burner designed for purely burning Zhundong(ZD) coal. Results show that there is an elliptic stable recirculation zone with 3 m long axis and 1.5 m short axis in the operation of the swirl burner. The petal-shaped flame exhibits the feature of "wind wrapping fire", and there exists a stable flame area after the recirculation zone. In the combustion process of ZD coal, the space distribution and volumetric fraction of various sodium-containing substances differ significantly;in the flame zone, sodium mainly presents in the form of Na(30%), Na2SO4(25%), NaCl(20%) and NaOH(10%), while at the outlet of combustion chamber, sodium mainly appears in the form of Na2SO4(43%), NaCl(30%) and Na2Cl2(24%). The sodium transformation could be roughly divided into three stages: sodium release process(0.28-0.37 s), rapid reaction process(<0.37-0.95 s), and Na2SO4 generation process(>0.95 s).
分 类 号:TK16[动力工程及工程热物理—热能工程]
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