冶金能源
冶金能源
야금능원
ENERGY FOR METALLURGICAL INDUSTRY
2014年
1期
14-19
,共6页
冯俊小%曹亚平%满毅%吴启明%向顺华
馮俊小%曹亞平%滿毅%吳啟明%嚮順華
풍준소%조아평%만의%오계명%향순화
辐射管%烟气循环%温度分布%温差
輻射管%煙氣循環%溫度分佈%溫差
복사관%연기순배%온도분포%온차
radiant tube%gas circulation%temperature distribution%temperature difference
运用亚音速烧嘴技术和烟气循环技术,设计了一种烟气高循环倍率的新型双a型辐射管,采用涡耗散燃烧模型和离散坐标辐射模型计算其燃烧传热过程。结果表明:42.6%的CH4在烧嘴内燃烧,57.4%的CH4在辐射管中心管内长度为800mm、直径为40mm的区域内燃烧;辐射管中心管内,循环烟气使火焰和气体等温线呈“椭圆型”分布,三通管和支管内,流动惯性使气体等温线呈“偏心圆”分布;双a型辐射管热效率为70.8%,壁面最高温度1065℃,最大温差79℃,中心管壁周向温差0~21℃,三通管及支管管壁周向温差0~15℃,整个辐射管管壁径向温差0~2.5℃。
運用亞音速燒嘴技術和煙氣循環技術,設計瞭一種煙氣高循環倍率的新型雙a型輻射管,採用渦耗散燃燒模型和離散坐標輻射模型計算其燃燒傳熱過程。結果錶明:42.6%的CH4在燒嘴內燃燒,57.4%的CH4在輻射管中心管內長度為800mm、直徑為40mm的區域內燃燒;輻射管中心管內,循環煙氣使火燄和氣體等溫線呈“橢圓型”分佈,三通管和支管內,流動慣性使氣體等溫線呈“偏心圓”分佈;雙a型輻射管熱效率為70.8%,壁麵最高溫度1065℃,最大溫差79℃,中心管壁週嚮溫差0~21℃,三通管及支管管壁週嚮溫差0~15℃,整箇輻射管管壁徑嚮溫差0~2.5℃。
운용아음속소취기술화연기순배기술,설계료일충연기고순배배솔적신형쌍a형복사관,채용와모산연소모형화리산좌표복사모형계산기연소전열과정。결과표명:42.6%적CH4재소취내연소,57.4%적CH4재복사관중심관내장도위800mm、직경위40mm적구역내연소;복사관중심관내,순배연기사화염화기체등온선정“타원형”분포,삼통관화지관내,류동관성사기체등온선정“편심원”분포;쌍a형복사관열효솔위70.8%,벽면최고온도1065℃,최대온차79℃,중심관벽주향온차0~21℃,삼통관급지관관벽주향온차0~15℃,정개복사관관벽경향온차0~2.5℃。
Combustion and heat transfer in double -a radiant tube (RT) were studied by Computa-tional Fluid Dynamics (CFD) in 3D condition.The Eddy-Dissipation combustion model and Discrete Ordinates radiation model were used in the simulation .The designed double -a RT is equipped with flue gas circulation tube and subsonic speed burner .The results show that the 42.6% of CH4 burned in the region diameter of 50mm in the burner, 57.4%of CH4 burned in the center tube with the length 800mm, diameter of 40mm.The flame shape and gas isotherm in the center tube is “elliptically dis-tributed” as a result of gas circulation.The gas isotherm in branch tube is “Eccentric circle distribu-ted” due to gas inertia.The efficiency of double a radiant tube is 70.8% with the maximum surface temperature of 1065℃and maximum temperature difference of 79℃.The circumferential temperature difference in center and branch tube surface is 0~21℃and 0~15℃respectively.The radial temper-ature difference in the tube surface is 0~2.5℃.