电站煤粉锅炉掺烧强结渣煤的混煤结渣性能研究

该文研究了华北某发电厂100 MW、200 MW燃煤机组由现烧的弱结渣煤改烧强结渣混煤的炉膛受热面结渣性能变化。在煤质与灰分成分测量与分析的基础上,根据工程上动力用煤配煤原则,并结合锅炉炉膛热力计算与2台锅炉的设计特点,分析预测了不同掺混比的混煤煤质主要结渣指标与程度,得到2台锅炉掺烧强结渣煤的合理比例。在理论分析基础上的试烧实验结果表明:在锅炉满负荷运行工况下,为避免炉膛出口受热面严重结渣,410t／h锅炉掺烧强结渣煤的比例不宜超过50％;670t／h锅炉掺烧强结渣煤的比例可适当增加到80％。实际试烧实验结果与理论预测基本吻合,该研究方法可为大型煤粉锅炉掺烧强结渣煤提供一定理论分析依据。

Performances of Pulverized-coal Boilers Burning Heavy Slagging Blending Coals

The slagging performance of the blended heavy slagging coals is investigated for 100MW and 200 MW boilers of a power plant in North China. Based on measurement and analysis of coals characteristics and ash composition, the main slagging parameters and tendency of the coal quality index of different blending ratios are predicted with the principle of coal blending and thermal calculation of the furnace. Reasonable blending ratios are presented for two boilers. The spot experimental result shows: To avoid heavy slagging of the discharge heater surface of the furnace, the blending ratios are not less than 50% for the 410t/h boiler and it can be properly added to 80% for the 670t/h boiler. The theoretical results are in agreement with experimental results.