摘要
老挝某626MW机组锅炉采用八角切圆燃烧方式,设计燃用低发热量褐煤,该机组增、减负荷速率高于国内600MW同类机组实际负荷变化率。由于锅炉的容积热负荷偏小、磨煤机研磨能力有限、来煤粒径偏大、煤粉细度无有效调节手段等原因,机组存在断油稳燃负荷较高、底渣含碳量较大、火焰稳定性较差等问题。对此,通过二次风量配比试验、磨煤机变组合方式等燃烧调整措施,使得该锅炉燃烧工况得以改善,炉底渣中可燃物从28.28%降至15.10%,飞灰可燃物从0.83%降至0.63%,未燃碳热损失从2.45%降至1.45%,锅炉的机械未完全燃烧损失降低,节能效果明显。
A 600 MW unit in Laoz applies octagonal corner tangentially-fired boiler with design coal of low heat value lignite coal.The load increase or decrease rate of this unit is higher than the actual load change rate of the similar 600 MW units in China.Due to such reasons as the low volumetric heat release rate of the boiler,limited grinding ability of the coal mill,large size of coal particles and lack of effective regulation on coal fineness,several problems occurred in this unit,like high stable load without diesel oil support,large amount of carbon content in the bottom slag,poor flame stability,and so on.Thus,combustion adjustment measures like the secondary air flow distribution test and coal mill combination changing were performed,to improve the combustion conditions.The results show the combustible matter content in the bottom slag reduced from 28.28%to 15.10%,in the fly ash dropped from 0.83%to 0.63%,and the unburned carbon heat loss decreased from 2.54% to 1.45%.The mechanical incomplete combustion heat loss reduced,indicating the energy saving effect is dramatic.
出处
《热力发电》
CAS
北大核心
2016年第5期100-106,共7页
Thermal Power Generation
关键词
锅炉
八角切圆
褐煤
风扇磨煤机
含碳量
燃烧调整
boiler
octagonal corner tangential
lignite
fan mill
carbon content
combustion regulation
