磨出口风粉混合物参数对锅炉燃烧影响的试验研究
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摘要
为得到煤粉细度、送粉管道内风粉混合物速度两参数变化对锅炉燃烧的影响,在某电厂300 MW机组上进行试验研究。试验结果表明,在试验煤种下煤粉细度增大,距喷口0.4 m处煤粉气流中心温度降至536℃,飞灰含碳量升至4.1%炉渣含碳量升至6.8%,A燃烧器区域炉膛截面平均温度下降,C燃烧器区域炉膛截面平均温度无明显变化,E燃烧器区域炉膛截面平均温度升高,30.5 m处炉膛截面平均温度下降;风粉混合物速度增大,喷口0.4 m处煤粉气流中心温度下降至346℃,飞灰含碳量升至3.6%,炉渣含碳量升高不明显,A燃烧器区域炉膛截面平均温度先升高后下降,C燃烧器区域炉膛截面平均温度略有升高,E燃烧器区域炉膛截面平均温度升高,30.5 m处炉膛截面平均温度升高。两者升高均不利于煤粉着火,飞灰含碳量均升高,炉膛温度场分布变化规律不一致。
In order to obtain the effects on combustion in boiler when some parameters such as pulverized coal fineness,velocity of primary air mixed pluverized coal particles change,testing on a 300 MW power plant. The results illustrate that when fineness rised,temperature of gas center 0.4 meter apart from burner reduced to 536℃,unburned carbon in fly dust rised 4.1% and unburned carbon rised 6.8%, average temperature located A burner cross section decreased, average temperature located C burner cross section was almost invariant, average temperature located E burner cross section rised,average temperature located 30.5 meter cross section decreased;when the flow velocity rised, temperature of gas center0.4 meter apart from burner reduced to 346℃,unburned carbon in fly dust rised 3.6% and unburned carbon didn't have a obvious rule, average temperature located A burner cross section increased before decreasing, average temperature located C burner cross section rise a little, average temperature located E burner cross section rised, average temperature located 30.5 meter cross section rised. Both parameters rised against ignition, unburned carbon in fly dust both rised,the temperature variation in boiler were different.
In order to obtain the effects on combustion in boiler when some parameters such as pulverized coal fineness,velocity of primary air mixed pluverized coal particles change,testing on a 300 MW power plant. The results illustrate that when fineness rised,temperature of gas center 0.4 meter apart from burner reduced to 536℃,unburned carbon in fly dust rised 4.1% and unburned carbon rised 6.8%, average temperature located A burner cross section decreased, average temperature located C burner cross section was almost invariant, average temperature located E burner cross section rised,average temperature located 30.5 meter cross section decreased;when the flow velocity rised, temperature of gas center0.4 meter apart from burner reduced to 346℃,unburned carbon in fly dust rised 3.6% and unburned carbon didn't have a obvious rule, average temperature located A burner cross section increased before decreasing, average temperature located C burner cross section rise a little, average temperature located E burner cross section rised, average temperature located 30.5 meter cross section rised. Both parameters rised against ignition, unburned carbon in fly dust both rised,the temperature variation in boiler were different.
引文
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[10]李文华,杨建国,崔福兴,等.提高中速磨煤机出口温度对锅炉运行的影响[J].2010,43(10):27~30.
[11]GB 10184-88.电站锅炉性能试验规程[S].
[12]Kalyan Annamalai,Wliilam Ryan.Experimental Studies on the Group Ignation of a Cloud of Coal Particles VolumeⅡPyrolysis and Ignation Modeling[J].Distribution Category UC-103,1991,12(2):104.
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[16]V S Gururajan.Mechanisms for the ignition of pulverized coal particles[J].Combustion and Flame,1990,81(2):119~132.
[2]姜秀民,杨海平,刘辉,等.粉煤颗粒粒度对燃烧特性影响热分析[J].中国电机工程学报,2002,22(12):142~145.
[3]翁善勇,赵虹.一种煤粉结渣特性预测方法——沉降炉试验法[J].热力发电,2004,33(4):28~30.
[4]张健,章明川,于娟,等.均相着火后挥发分燃烧的移动火焰锋面模型[J].燃烧科学与技术,2009,15(5):451~456.
[5]姚强,周俊虎,涂建华,等.煤粉群非稳态统一着火模型[J].浙江大学学报,1996,30(4):446~454.
[6]赵云华,何玉荣,陆慧林,等.煤粉颗粒群着火和燃烧过程的数值模拟[J].燃烧科学与技术,2007,13(2):107~112.
[7]聂欣,周志军,吕明,等.煤粉气流在高温空气中着火与熄火的试验研究[J].中国电机工程学报,2008,28(14):68~72.
[8]秦裕琨,李争起,孙锐,等.风包粉煤粉燃烧原理及实验研究[J].中国电机工程学报,2000,20(5):59~62.
[9]许开龙,俞伟伟,吴玉新,等.—次风氧浓度对煤颗粒群着火特性影响的实验研究[J].工程热物理学报,2013,34(10):1964~1968.
[10]李文华,杨建国,崔福兴,等.提高中速磨煤机出口温度对锅炉运行的影响[J].2010,43(10):27~30.
[11]GB 10184-88.电站锅炉性能试验规程[S].
[12]Kalyan Annamalai,Wliilam Ryan.Experimental Studies on the Group Ignation of a Cloud of Coal Particles VolumeⅡPyrolysis and Ignation Modeling[J].Distribution Category UC-103,1991,12(2):104.
[13]Sada E,Kumazawa H,Kudsy M.Pyrolysis of lignins in molten salt media[J].Ind Eng Chem res,1992,31:612~636.
[14]Xu Weichun,Tomita A.Effect of temperature on the flash pyrolysis of various coals[J].Fuel,1987,66:632~636.
[15]岑可法,姚强,骆仲泱,等.高等燃烧学[M].浙江大学出版社,2002.303.
[16]V S Gururajan.Mechanisms for the ignition of pulverized coal particles[J].Combustion and Flame,1990,81(2):119~132.