烧结环冷机零排放工况的热工数值模拟与分析
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摘要
提出一种利用稳态热力学模型加高度离散化网格的有限元方法,采用C#语言编制了高效计算软件,成功地模拟了烧结矿零排放工况下复杂的非稳态热力学过程,模拟结果与现场实测数据基本吻合。结果表明:低温废气循环至中温段利用对烧结矿冷却终点温度有显著影响;采用偏析布料、延长冷却时间并提高料层厚度等措施改善效果不明显,说明换热接近平衡状态;采用加大风量、减少气流偏析、改变循环模式等增加冷却介质的方法,改善效果明显,印证了上述推断。
The finite element method of steady state thermodynamics model and highly discretized grid is proposed,the high efficient computer software is programmed in C# language,the complex unsteady state thermodynamics process under zero emission working condition of sinter is successfully simulated,and the simulation results basically accord with the field measurement data.The results show that,low temperature exhaust gas recycling to medium temperature section waste gas utilization has significant effect on the sinter cooling end point temperature.Little improvement effects are achieved by such measures as adopting segregation distribution of sinter,prolonging cooling time and increasing material bed depth etc.,which shows that the heat transfer is close to equilibrium state.However,the improvement effect is obvious by increasing air volume,reducing air segregation and changing circulation pattern etc.,which proves the abovementioned conclusion.
The finite element method of steady state thermodynamics model and highly discretized grid is proposed,the high efficient computer software is programmed in C# language,the complex unsteady state thermodynamics process under zero emission working condition of sinter is successfully simulated,and the simulation results basically accord with the field measurement data.The results show that,low temperature exhaust gas recycling to medium temperature section waste gas utilization has significant effect on the sinter cooling end point temperature.Little improvement effects are achieved by such measures as adopting segregation distribution of sinter,prolonging cooling time and increasing material bed depth etc.,which shows that the heat transfer is close to equilibrium state.However,the improvement effect is obvious by increasing air volume,reducing air segregation and changing circulation pattern etc.,which proves the abovementioned conclusion.
引文
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[3] 田万一,张家元,戴传德,等.环冷机偏析布料研究[J].中南大学学报(自然科学版),2015,46(4):1596.
[4] 向锡炎,周浩宇,贺新华,等.大块烧结矿冷却特性数值模拟研究 [J].烧结球团,2018,43(1):31.
[5] 张思平,张震,温荣耀,等.烧结立式冷却机流场数值模拟研究[J].烧结球团,2017,42(6):19.
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[12] 张惠宁,郭奠球.烧结设计手册[M].第1版.北京:冶金工业出版社,2008:321.
[2] 冯俊小,梁凯丽,张材,等.环冷机内球团矿热过程数学模型[J].北京科技大学学报,2010,32(12):1182.
[3] 田万一,张家元,戴传德,等.环冷机偏析布料研究[J].中南大学学报(自然科学版),2015,46(4):1596.
[4] 向锡炎,周浩宇,贺新华,等.大块烧结矿冷却特性数值模拟研究 [J].烧结球团,2018,43(1):31.
[5] 张思平,张震,温荣耀,等.烧结立式冷却机流场数值模拟研究[J].烧结球团,2017,42(6):19.
[6] 杨世铭,陶文铨.传热学[M].第4版.北京:高等教育出版社,2006:33.
[7] Kwendakwema N J,Boehm R F.Parametric study of mixed convection in a porous medium between vertical concentric cylinders.[J] Heat Transfer,1991,113(1):128.
[8] 吴铿.冶金传输原理[M].第1版.北京:高等教育出版社,2011,127.
[9] 杨世铭,陶文铨.传热学[M].第4版.北京:高等教育出版社,2006:附录559.
[10] 王萌.烧结余热竖罐式回收料层换热系数的实验研究[D]. 沈阳:东北大学,2012.
[11] 姜涛.烧结球团生产技术手册[M].第1版.北京:冶金工业出版社,2014:附录874.
[12] 张惠宁,郭奠球.烧结设计手册[M].第1版.北京:冶金工业出版社,2008:321.
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