摘要
针对某电厂660MW超临界锅炉OPCC型旋流燃烧器大面积烧损给该电厂带来严重经济损失的实际情况,详细分析了旋流燃烧器烧损的原因,包括旋流燃烧器材料的选择、结构设计上的缺陷和现场运行存在的问题等方面.对全炉膛进行了热态数值模拟,得到旋流燃烧器烧损的关键原因,并提出相应的改造措施.结果表明:内二次风旋流强度过大是造成旋流燃烧器烧损的主要原因;一次风风筒所用材质为碳钢,材料的耐热等级不够,应采用高温耐磨合金钢整体铸造;陶瓷粘贴工艺不妥易造成陶瓷脱落,改进陶瓷粘贴工艺可避免陶瓷脱落;中心风风筒为耐热钢,现场观察到其氧化严重,应改进中心风风筒材料制造的工艺.
Aiming at actual situations that great economic loss was brought to a 660 MW supercritical boiler due to large area burnout of its OPCC swirl burners, detailed analysis was carried out on the burnout cau- ses, including the selection of swirl burner materials, defects in structural design, problems in field opera tion, and so on. Through thermal numerical simulation to the whole furnace, corresponding burnout reasons were found, based on which improvement measures were proposed for the swirl burners. Results show that the main burnout reason is the too high swirl intensity of the inner secondary airl the primary air duct made of carbon steel is inadequate for heat-resistant requirement, which should be replaced with high- temperature abrasion-resistant alloy steel by integral casting; previous ceramic paste process is easy to cause the falling off of ceramics, which should be modified; serious carbonization is found on the central air duct made of heat-resistant steel, of which the manufacturing technology should be improved.
出处
《动力工程学报》
CAS
CSCD
北大核心
2013年第6期430-436,共7页
Journal of Chinese Society of Power Engineering
