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针对多点供热式焦炉的结构特征以及工艺特点,建立了描述其内部流动、传热以及燃烧等过程的燃烧室-炭化室三维非稳态数理模型,并进行了数值求解;考察了多点供热方式下的高向加热均匀性以及NO的生成量,与传统下喷式单点供热方式进行了对比分析;并进一步针对装炉煤的水分、堆密度和初始温度,空气和高炉煤气分级数目,以及废气循环倍率等操作参数开展了正交试验模拟分析。研究结果表明:采用分级燃烧技术,有效提高了焦饼的高向温度均匀性,使其在大规模生产的同时,保证了焦炭的质量;同时,较之传统单点供热焦炉,有效改善了局部燃烧温度过高的现象,使NO体积分数明显减少;废气循环倍率、装炉煤堆密度对焦炉生产的影响最为显著。这对焦炉的大型化、高效节能以及清洁生产有一定的指导作用。

According to the structure and process characteristics of large-capacity coke oven with multiple-point heat supply,a 3-D mathematical model was established to describe the flow,combustion and heat transfer process in coupled coking and combustion chambers. The numerical solution was obtained. The impacts of multiple-point heat supply on the coking process were analyzed and compared with the conventional coke oven. The comparison showed that the multiple-point heat supply plays a significant role in the coking process. The mass percent of moisture,the bulk density,the initial temperature,the number of flue air points and the circulating ratio of flue gas were analyzed by the orthogonal experiment. It indicates that the staged combustion technology can effectively improve gas temperature uniformity along the vertical direction,and the production as well as the quality of the coke is improved. Meanwhile the volume percent of NO of exhaust is reduced. The results can be applied to large-scale coke oven design,process optimization,and clean production in coke oven industry.

参考文献

[1] 苟湘 .直流煤粉低燃烧和再燃技术的实验、理论与数值模拟研究[D].杭州:浙江大学,2007.
[2] T.V. Breikin;I.D. Herbert;S.K. Kim;S. Regunath;S.M. Hargrave;H.A. Thompson;P.J. Fleming .Staged combustion control design for aero engines[J].Control engineering practice,2006(4):387-396.
[3] HOU Lingyun,Bernhard WEIGAND,Marius BANICA.Effects of Staged Injection on Supersonic Mixing and Combustion[J].中国航空学报(英文版),2011(05):584-589.
[4] Masayuki Taniguchi;Yuki Kamikawa;Tetsuma Tatsumi;Kenji Yamamoto .Staged combustion properties for pulverized coals at high temperature[J].Combustion and Flame,2011(11):2261-2271.
[5] Junchao Wang;Weidong Fan;Yu Li;Meng Xiao;Kang Wang;Peng Ren .The effect of air staged combustion on NOx emissions in dried lignite combustion[J].Energy,2012(1):725-736.
[6] Okasha F .Staged combustion of rice straw in a fluidized bed[J].Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics,2007(1):52-59.
[7] Michael Becidana;Dusan Todorovic;Roger A Khalil .Ash relat-ed behaviour in staged and non-staged combustion of biomass fuels and fuel mixtures[J].Biomass and Bioenergy,2012,41:86.
[8] 张晓辉,孙锐,孙绍增,秦明.立体分级燃烧对NOx排放特性的影响[J].机械工程学报,2009(02):199-205.
[9] 王浩,邹琳江.空气分级燃烧降低NOx排放技术的研究[J].工业加热,2008(04):8-11.
[10] 景雪晖;刘国庆;王涌 等.两段式分级燃烧技术及其实炉应用[J].新疆电力技术,2011,2(10):38.
[11] Merrick D .Mathematical models of the thermal decomposition of coal:1. The evolution of volatile matter[J].FUEL,1983,62(05):534.
[12] Zhancheng Guo,Huiqing Tang.NUMERICAL SIMULATION FOR A PROCESS ANALYSIS OF A COKE OVEN[J].中国颗粒学报(英文版),2005(06):373-378.
[13] 张安强,冯妍卉,张欣欣,金珂,张长青,王明登,徐妍.焦炉燃烧室-炭化室热过程数值模拟及解耦算法[J].化工学报,2012(02):455-462.
[14] 张欣欣,张安强,冯妍卉,刘健,张长青,于振东.焦炉能耗分析与余热利用技术[J].钢铁,2012(08):1-4,12.
[15] 徐列,张欣欣,张安强,冯妍卉,刘健,李振颐.换热式两段焦炉及其炼焦工艺[J].中国冶金,2013(07):51-55.
[16] 张安强,张欣欣,徐列,冯妍卉,李振颐.换热式两段焦炉热工预测[J].中国冶金,2013(06):40-43.
[17] 金珂,冯妍卉,张欣欣,林蔚,张长青,杨俊峰,马小波.耦合燃烧室的焦炉炭化室内热过程的数值分析[J].化工学报,2012(03):788-795.
[18] 金珂,冯妍卉,张欣欣,张庆环,张长青,杨俊峰,马小波.耦合分级燃烧的大容积焦化过程仿真[J].中国电机工程学报,2012(35):13-20,前插3.
[19] 金珂,冯妍卉,张欣欣,王明登,杨俊峰,马小波.焦炉加热系统流量分配的数值仿真[J].钢铁,2013(09):16-20.
[20] 韩占忠;王敬;兰小平.FLUENT流体工程仿真计算实例与应用[M].北京:北京理工大学出版社,2008
[21] Loffler G;Sieber R .NOx formation in natural gas combustion-a new simplified reaction scheme for CFD calculations[J].FUEL,2005,84(06):512.
[22] Glassman O.Combustion[M].New Jersey:Academic Press,1997
[23] 霍芳 .直行温度数学模型及其在宝钢三期焦炉中的应用[D].北京:北京科技大学,1998.
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