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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 the fact that the large-scale burning of the OPCC swirling burner in a power plant’s 660 MW supercritical boiler brings serious economic losses to the power plant, the reasons for the burning of the swirling burner are analyzed in detail, including the selection of the material of the swirling burner, The defects of structure design and the problems existing in field operation, etc. The hot state numerical simulation of the whole furnace was carried out, the key reason of the burning of the cyclone burner was obtained, and the corresponding reformation measures were put forward.The results showed that the internal secondary cyclone Flow intensity is too large is caused by cyclone burner burning the main reason; a wind tube material used for the carbon steel, heat-resistant grade of the material is not enough, should be high temperature wear-resistant alloy steel casting; ceramic paste process is not easy to cause Ceramic shedding, ceramic paste to improve the process can prevent the ceramic off; Center wind duct heat-resistant steel, the scene observed its serious oxidation should be made to improve the center wind duct material manufacturing process.