【作者】 王正华；

【导师】 岑可法； 周昊；

【作者基本信息】 浙江大学 ， 工程热物理， 2003， 硕士

【摘要】 随着人们环保意识的提高，人们越来越清楚地认识到煤粉燃烧过程中生成的气体SO₂和NOx严重威胁着人类环境和人体健康。因此控制SO₂和NOx已成为煤粉燃烧领域中的重要课题。 本文首先对脱硫和脱硝技术进行了文献综述，随后在一维沉降炉内进行了不同煤粉燃烧以及几种混煤燃烧的试验研究，系统考察了不同因素如炉膛温度、过量空气系数、二次风风温、一二次风比例、给粉量等对SO₂和NOx排放规律的影响，试验的结果为一些煤粉炉煤粉燃烧选择合适的参数控制NOx和SO₂的排放有一定的指导意义。 接着在煤粉燃烧试验的基础上本文试验研究了炉内喷钙脱硫时SO₂和NOx排放规律的变化，特别对喷钙脱硫时对NOx的影响做了重点分析研究。同时对低过量空气系数下喷钙脱硫作了进一步试验研究，探讨了几种因素对喷钙脱硫内部机理的影响。另外对炉内喷钙脱硫时对锅炉运行的影响进行了理论分析。 最后在前期对NOx排放规律研究的基础上进行了煤粉再燃降低NOx的试验研究，对在煤粉炉采用煤粉再燃脱硝技术时不同影响因素的改变对脱硝效果的影响进行了系统考察。更多还原

【Abstract】 As people pay more attention to the environment protection issue, people know more about the SO2 and NOx created in the coal combustion, which threaten people s health and environment. So it is an important task that people control the emission of SO2 and NOx in the field of pulverized coal burning.At first, the technology of desulfuration and reducing NOx is summarized. And we do some experimental studies of the formation of SO2 and NOx for kinds of coals and blending coals in a tube furnace. The factors that influence the SO2 and NOx emission are studied, such as the furnace temperature, excess air factors, the temperature of the second wind, the ratio of the first wind, the second wind, and the quantity of coal powder etc. There are some benefits on selecting appropriate parameters of some boilers to control the SO2 and NOx emission.In the second, we study the formation of SO2 and NOx when we eject the limestone in the furnace on the base of these results. Especially we do some experiments on the change of the NOx when we eject the limestone. And we do some experiments on the formation disciplinarian of the desulfuration products in the course of coal combustion with the limestone desulfuration by changing different influential factors. In addition we assay the effect of the above technology on the furnace running.In the end, we do some experimental studies on reducing the NOx emission by the technology of coals reburning on the base of the foregoing, and discuss the effects on the reduction efficiency of the NOx emission by transforming different formative factors.更多还原