Abstract:A three-dimensional mathematical model including gas?solid flow, radiation and coal combustion was established to simulate the pulverized coal injection in blast furnace raceway. With the help of commercial software, the flow field, temperature field and composition change in the raceway were simulated. The results showed that the flow pattern can be divided into two parts: a high-speed jet along the tuyere direction and a large-scale recirculation at the upper part of the raceway. The distributions of temperature field was not uniform, and the temperature was higher at the lower part of raceway and the heat transmits to the upper part along the boundary of the raceway. Oxygen was consumed constantly along the tuyere axis. The carbon dioxide content increased with the decrease of oxygen content and reached the maximum when the oxygen was almost exhausted. Then, the carbon monoxide content increased rapidly with the carbon dioxide content decreased. The increase of blast oxygen enrichment, blast temperature and blast rate can promote the combustion of pulverized coal and increase the burning speed of pulverized coal.
[1] 汤清华, 王筱留, 祁成林., 高炉喷吹煤粉知识问答 [M]. 第二版, 北京:冶金工业出版社,2016: 235.
[2]Kuwabara M, He J C, Muchi I.喷吹煤粉的大型高炉炉内状况的数值分析[J].钢铁, 1985, 20(10):5-8
[3]Jamaluddin A S, Truelove J S, Wall T F.Modeling of Coal Devolatilization and Its Effect on Combustion Calculations[J].Combustion Flame, 1985, 62(1):85-89
[4]Takeda K, Lockwood F C.Integrated Mathematical Model of Pulverised Coal Combustion in a Blast Furnace[J].ISIJ Int., 1997, 37(5):432-440
[5]Zhang S F, Bai C G, Wen L Y, et, al.Gas-Particle Flow and Combustion Characteristics of Pulverized Coal Injection in Blast Furnace Raceway[J].J Iron Steel Res Int, 2010, 17(10):8-12
[6]张仕洋,薛庆国,刘锦周,等.回旋区内喷吹煤粉燃烧行为的数值模拟[J].过程工程学报, 2014, 14(2):273-279
[7]Guo B Y, Zulli P, Rogers H, et, al.Three-dimensional Simulation of Flow and Combustion for Pulverised Coal Injection[J].ISIJ Int., 2005, 45(9):1272-1282
[8]Shen Y S, Guo B Y, Yu A B, et, al.Model Study of the Effects of Coal Properties and Blast Conditions on Pulverized Coal Combustion[J].ISIJ Int., 2009, 49(6):819-826
[9] 宿立伟,程树森.高炉回旋区内煤粉燃烧数值模拟 [C].2006年全国炼铁生产技术会议暨炼铁年会文集, 杭州: 中国金属协会, 2006: 400-402.
[10]Nogami H, Yamaoka H, Takatani K.Raceway Design for the Innovative Blast Furnace[J].ISIJ Int., 2004, 44(12):2150-2158
[11] Du S W, Ho C K, Tung C H.Numerical investigations into burning characteristics of pulverised coal within the BF raceway at various injection lances [C]. Collected Works of Baosteel BAC 2013, ShangHai: Metallurgical Industry Press, 2013: 300-304
[12]Du S W, Yeh C P, Chen W H, et, al.Burning characteristics of pulverized coal within blast furnace raceway at various injection operations and ways of oxygen enrichment[J].Fuel, 2015, 143(1):96-108
[13]Kobayashi H, Howard J B, Sarofim A F.Coal devolatilization at high temperature[J].Symposium (International) on Combustion, 1977, 16(1):411-425
[14]Ubhayakar S K, Stickler D B, Von Rosenberg C W, et al.Rapid Devolatilization of Pulverized Coal in Hot Gases[J].Symposium (International) on Combustion, 1977, 16(1):427-436
[15]Sivathanu Y R, Faeth G M.Generalized state relationships for scalar properties in non-premixed hydrocarbonair flames[J].Combust Flame, 1990, 82(2):211-230
[16]Jones W P, Whitelaw J H. Calculation Methods for Reacting Turbulent Flows [J]. Combustion Flame, 1982, 48: 1-26.
[17] Siegel R and Howell J R.Thermal Radiation Heat Transfer [M]. Washington DC: Hemisphere Publishing Corp, 1992.
[18]Cheng P.Two-dimensional radiating gas flow by a moment method[J].Aiaa J., 1964, 2(9):1662-1664
[19] 成兰伯.高炉炼铁工艺及计算 [M]. 北京:冶金工业出版社,1993: 218.
[20] 福武刚.高炉回旋区和炉缸工作文集 [M]. 杜鹤桂 译. 北京:冶金工业出版社,1986: 48.