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焦炭燃烧模型的改进及其Fluent实现与实验验证

DOI: 10.13334/j.0258-8013.pcsee.2015.07.016, PP. 1681-1688

Keywords: 焦炭燃烧模型,热失活,灰分抑制,Fluent

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Abstract:

为了在煤粉燃烧全过程中准确模拟焦炭转化率的沿程变化,在Fluent中缺省的焦炭燃烧反应/扩散联合控制模型的基础上,加入对高温热失活现象、灰分抑制作用的定量描述,建立了一个新的焦炭燃烧模型。通过编写用户自定义函数的方法将开发的模型在Fluent平台上进行了实现,对比测试结果表明程序的编写正确无误。通过沉降炉实验台获得了2种烟煤在整个燃烧过程中的燃烧特性并据此对新的焦炭燃烧模型进行了验证。模拟的结果表明:新的焦炭燃烧模型要明显优于Fluent中缺省的联合控制模型,其预测的焦炭转化率在整个燃烧过程中的准确性有明显提高,预测偏差在±10%以内。此外还讨论了模型参数与煤种特性之间的关系。

References

[1]  岑可法,姚强,骆仲泱,等.高等燃烧学[M].浙江:浙江大学出版社,2002:150-200.Cen Kefa,Yao Qiang,Luo Zhongyang,et al.Advanced Combustion Theory[M].Zhejiang:Zhejiang University Press,2002:150-200. (in Chinese).
[2]  Choi C R,C N Kim,Numerical investigation on the flow,combustion and NO x emission characteristics in a 500 MWe tangentially fired pulverized-coal boiler[J].Fuel,2009,88(9):1720-1731.
[3]  Ribeirete A,Costa M.Impact of the air staging on the performance of a pulverized coal fired furnace[J].Proceedings of the Combustion Institute,2009,32(2):2667-2673.
[4]  温智勇,廖宏楷.锅炉低NO x 排放改造及试验结果分析[J].电力环境保护,2009,25(4):19-21.Wen Zhiyong,Cen Hongkai.Reformation of boiler for low NO x emission and experimental analysis[J].Electric Power Environmental Protection,2009,25(4):19-21(In Chinese).
[5]  孙保民,白涛,郭永红 等.降低冷灰斗内灰渣含碳量的数值模拟和试验研究[J].中国电机工程学报,2012,32(29):22-29.Sun Baomin,Bai Tao,Guo Yonghong,et al.Numerical simulation and experimental research on reducing carbon content in slag in a tangential fired boiler[J].Proceedings of the CSEE,2012,32(29):22-29(in Chinese).
[6]  王志刚,张海,陈昌和,等.煤焦反应动力学参数对电站锅炉燃烧影响的数值研究[J].中国电机工程学报,2007,27(2):21-25.Wang Zhigang,Zhang Hai,Chen Changhe,et al.Numerical investigation of effects of diffusion-kinetics parameters to the comprehensive combustion simulation [J].Proceedings of the CSEE,2007,27(2):21-25(in Chinese).
[7]  Karlström O,Brink A, Hercog, J,et al.One-parameter model for the oxidation of pulverized bituminous coal Chars[J].Energy & Fuels,2012,26(2):968-975.
[8]  Zolin A,Jensen A,Dam-Johansen K.Kinetic analysis of char thermal deactivation[J].Proceedings of the Combustion Institute,2000,28(2):2181-2188.
[9]  Senneca O,Salatino P.A semi-detailed kinetic model of char combustion with consideration of thermal annealing[J].Proceedings of the Combustion Institute,2011,33(2):1763-1770.
[10]  张永春,张军,盛昌栋 等.O 2 /CO 2 气氛下煤焦燃烧过程中碳官能团演化行为研究[J].中国电机工程学报,2011,31(2):27-31.Zhang Yongchun,Zhang Jun,Sheng Changdong,et al.Evolution of carbon functionality during coal char combustion in O 2 /CO 2 atmosphere[J].Proceedings of the CSEE,2011,31(2):27-31(in Chinese).
[11]  Hur R,Sun J,Lunden M.A kinetic model of carbon burnout in pulverized coal combustion[J].Combustion and Flame,1998,113(1-2):181-197.
[12]  .Wu HW,Wall T, Liu G S, et al. Ash Liberation from Included Minerals during Combustion of Pulverized Coal:? The Relationship with Char Structure and Burnout[J].Energy & Fuels,1999,13(6):1197-1202.
[13]  Zhang H T,Yan J H, Ni M J,et al.The research on gas diffusion through the coal ash layer during the coal combustion process[J].Combustion Science and Technology,2002,174(10):55-73.
[14]  魏砾宏,姜秀民,李爱民,等.矿物成分对超细化煤粉燃烧特性影响的实验研究[J].中国电机工程学报,2007,27(8):5-10.Wei Lihong,Jiang Xiumin,Li Aimin,et al.Influence of mineral matter on combustion character in micro-pulverized coal during combustion[J].Proceedings of the CSEE,2007,27(8):5-10(in Chinese).
[15]  .Karlström O,Brink A,Hupa M,et al.Multivariable optimization of reaction order and kinetic parameters for high temperature oxidation of 10 bituminous coal chars[J].Combustion and Flame,2011,158(10):2056-2063.
[16]  Ballester J.Jiménez S.Kinetic parameters for the oxidation of pulverized coal as measured from drop tube tests[J].Combustion and Flame,2005,142(3):210-222.
[17]  张保生,刘建忠,周俊虎,等.一种基于多重扫描速率法求解煤燃烧反应参数的新方法[J].中国电机工程学报,2009,29(32):45-50.Zhang Baosheng,Liu Jianzhong,Zhou Junhu,et al.A new method based on multi-heating rate methods for coal combustion parameters[J].Proceedings of the CSEE,2009,29(32):45-50(in Chinese).
[18]  张保生,刘建忠,周俊虎,等.利用Popescu法对煤燃烧反应机理的研究[J].中国电机工程学报,2006,26(15):68-72.Zhang Baosheng,Liu Jianzhong,Zhou Junhu,et al.Popescu method for combustion kinetic mechanisms of coals[J].Proceedings of the CSEE,2006,26(15):68-72(in Chinese).
[19]  Robert G J,Satyendra P N,Philip L W J.Reactivity of heat-treated coals in air at 500℃[J].Fuel,1973,52(4):288-293.
[20]  张守玉,吕俊复,王文选,等.热处理对煤焦反应性及微观结构的影响[J].燃料化学学报,2004,32(6):673-678.Zhang Shouyu,Lü Junfu,Wang Wenxuan,et al.Effect of heat treatment on the reactivity and microstructure of coal-char[J].Journal of Fuel Chemistry and Technology,2004,32(6):673-678(in Chinese).
[21]  Yoshizawaa N,Maruyamaa K,Yamashitab T,et al.Dependence of microscopic structure and swelling property of DTF chars upon heat-treatment temperature[J].Fuel,2006,85(14-15):2064-2070.
[22]  Dong S,Alvarez P,Paterson N,et al.Study on the effect of heat treatment and gasification on the carbon structure of coal chars and metallurgical cokes using fourier transform Raman spectroscopy[J].Energy Fuels,2009(23):1651-1661.
[23]  Suuberg E N.Thermally induced changes in reactivity of carbons[J].Fundamental Issues in Control of Carbon Gasification Reactivity,1991(192):269-305.
[24]  Nagle J,Strickland-Constable R F.Oxidation of Carbon between 1000-2000℃[C]//Proceedings of Fifth Conference on Carbon,Macmillan,1962:154-164.
[25]  Salatino P,Senneca O,Masi S.Assessment of thermodeactivation during gasification of a bituminous Coal Char[J].Energy Fuels,1999,13(6):1154-1159.
[26]  Senneca O,Salation P.Loss of gasification reactivity toward O 2 and CO 2 upon heat treatment of carbon[J].Proceedings of the Combustion Institute,2002,29(1):485-493.

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