八角切圆褐煤锅炉运行优化调整  

Operation optimization for octagonal corner tangentially-fired boiler burning low heat value lignite coal

作　　者：张向群 丁永允 曹阳 宋振宇 魏来 李绍志 黄润泽 李勇 

机构地区：[1]国网辽宁电科院有限公司,辽宁沈阳110006 [2]辽宁红沿河核电有限公司,辽宁大连116001

出　　处：《热力发电》2016年第5期100-106,共7页Thermal Power Generation

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.

关 键 词：锅炉 八角切圆 褐煤 风扇磨煤机 含碳量 燃烧调整 

分 类 号：TK223.2[动力工程及工程热物理—动力机械及工程]