CFB锅炉钟罩式风帽磨损及漏渣原因分析  

Reason analysis on abrasion and ash leakage of bell-type air nozzle in a circulating fluidized bed boiler

作　　者：黄中[1] 

机构地区：[1]中国华能集团清洁能源技术研究院有限公司,北京100098

出　　处：《热力发电》2014年第4期102-105,109,共5页Thermal Power Generation

基　　金："十二五"国家科技支撑计划"CFB锅炉燃用难燃煤种的研究"项目(2012BAA02B02);中国华能集团公司科学技术项目"燃用劣质燃料350MW超临界CFB锅炉研制"(HNKJ10-23)

摘　　要：钟罩式风帽在大型循环流化床(CFB)锅炉中普遍采用,随着锅炉运行时间的增加其漏渣和磨损问题日益突出,影响锅炉的安全性和稳定性。对其成因进行分析研究,发现芯管顶部与风帽外罩间隙是产生钟罩式风帽漏渣及磨损的重要原因,通过数值模拟分析了不同间隙下的风帽阻力特性。结果表明,芯管顶部与风帽外罩之间存在1mm间隙时风帽阻力下降9.1%,存在3mm间隙时风帽阻力下降21.8%,存在5mm间隙时风帽阻力下降30.8%,间隙的存在严重破坏了钟罩式风帽的阻力特性。此外,钟罩式风帽外罩出口小孔设置方式对漏渣和磨损也有不良影响,风帽外罩小孔可以考虑向下倾斜开设。The belltype air nozzle is commonly used in large scale circulating fluidized bed （CFB） boilers. However,ash leakage and abrasion occurs on a great number of the belltype air nozzles during practical operation,and turns worse with the boiler service time,which finally affects safe ty and stability of the boiler. Analysis for this problem shows the gap between core tube top and the air nozzle clothing is the major reason. The resistance performance of the air nozzle with dif ferent gaps was numerically investigated. The results show that, the resistance of the air nozzle dropped by 9.1% ,21.8% and 30.8% when the gap was 1 mm,3 mm and 5 mm,respectively,indi cating the gap has seriously damaged the resistance of the air nozzle. Besides,the setting mode of the hole at outlet of the belltype air nozzle also had a bad effect on ash leakage and abrasion. It suggested the hole can be downward declined.

关 键 词：CFB锅炉 钟罩式风帽 磨损 漏渣 阻力特性 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]