The primary wind of a low-NO_x coaxial swirling burner was visualized byusing glycol as smog tracer. The information of the visual flow field was input into a computerthrough image-capturing card with CCD camera as th...The primary wind of a low-NO_x coaxial swirling burner was visualized byusing glycol as smog tracer. The information of the visual flow field was input into a computerthrough image-capturing card with CCD camera as the image-capturing element. The boundary of thevisual zone, i. e. , the interface of the primary wind and secondary wind was obtained by imageprocessing. The fractal dimension (FD) of the boundary was examined and found to vary from 1. 10 to1. 40 with S_1, S_2 and ζ_1 . It is concluded that when FD is small, the complex level of theinterface is low, and mixture between the primary and secondary wind is weak near the exit of theburner at the initial phase of combustion resulting in stratified flow; when FD is big, mixturebecomes strong near the exit of the burner. It is showed that the flow with FD ranging from 1.10 to1. 20 is stratified flow, which is benefical to reduce NO_x yield and the flow with FD from 1. 25 to1. 40 is mixed flow, producing much NO_x. The mechanism of the forming of stratified flow and mixedflow was theoretically analyzed. The corresponding S_1 , S_2 and ζ_1 of these flows were given.展开更多
随着国家对污染物排放标准的提高,扬子乙烯装置裂解炉150 mg/Nm^(3)的烟气氮氧化物(NO_(x))排放量已无法满足新标准不大于100 m g/Nm^(3)的要求。在工艺条件不变的情况下对燃烧器进行改造,并针对改造后运行存在NOx超标问题,采取日常调...随着国家对污染物排放标准的提高,扬子乙烯装置裂解炉150 mg/Nm^(3)的烟气氮氧化物(NO_(x))排放量已无法满足新标准不大于100 m g/Nm^(3)的要求。在工艺条件不变的情况下对燃烧器进行改造,并针对改造后运行存在NOx超标问题,采取日常调整优化、注入蒸汽、风门密封等措施,使得NO_(x)排放量达标。展开更多
文摘The primary wind of a low-NO_x coaxial swirling burner was visualized byusing glycol as smog tracer. The information of the visual flow field was input into a computerthrough image-capturing card with CCD camera as the image-capturing element. The boundary of thevisual zone, i. e. , the interface of the primary wind and secondary wind was obtained by imageprocessing. The fractal dimension (FD) of the boundary was examined and found to vary from 1. 10 to1. 40 with S_1, S_2 and ζ_1 . It is concluded that when FD is small, the complex level of theinterface is low, and mixture between the primary and secondary wind is weak near the exit of theburner at the initial phase of combustion resulting in stratified flow; when FD is big, mixturebecomes strong near the exit of the burner. It is showed that the flow with FD ranging from 1.10 to1. 20 is stratified flow, which is benefical to reduce NO_x yield and the flow with FD from 1. 25 to1. 40 is mixed flow, producing much NO_x. The mechanism of the forming of stratified flow and mixedflow was theoretically analyzed. The corresponding S_1 , S_2 and ζ_1 of these flows were given.
文摘随着国家对污染物排放标准的提高,扬子乙烯装置裂解炉150 mg/Nm^(3)的烟气氮氧化物(NO_(x))排放量已无法满足新标准不大于100 m g/Nm^(3)的要求。在工艺条件不变的情况下对燃烧器进行改造,并针对改造后运行存在NOx超标问题,采取日常调整优化、注入蒸汽、风门密封等措施,使得NO_(x)排放量达标。
