260 t/h纯烧准东煤循环流化床锅炉设计与运行

新疆准东地区煤以高钠煤为主,具有极强的沾污结渣特性,电站锅炉在燃用准东煤过程中易出现水冷壁结渣,对流受热面沾污积灰,影响锅炉的正常运行。根据准东煤的煤质特点,分析了发生结焦沾污的基本过程,提出了利用循环流化床锅炉循环燃烧的技术特点,通过受热面的合理布置及设计以应对燃用准东煤可能出现的结焦沾污问题,并进行了设计研究和工程应用。锅炉投运后的运行结果表明,该锅炉能够长期纯烧准东煤,运行稳定。在燃煤灰分中Na₂O含量6.0%的准东煤,运行一年后,锅炉各受热面均未出现沾污及结焦现象。在尾部低温省煤器吹灰器投入运行时,锅炉排烟温度能够维持在150 ℃左右。

Design and Operation of the 260 t/h Circulating Fluidized Bed Boiler Burning Zhundong Coal

The high sodium coal is the dominant type in Zhundong area, Xinjiang province. It has the characteristics of strong contamination and slagging. coal slagging and the convective heating surface fouling frenquently appear in the boiler burning Zhundong coal, which affects the normal operation of the boiler. This paper analyzes the slagging and fouling process of Zhundong coal, and suggests that reasonable arrangement and design of the heating surface by taking advantage of the combustion cycle in the circulating fluidized bed boiler will be able to solve the possible slagging and fouling problems. The engineering design and application are also carried out. The operation results have shown that the boiler can maintain long-term stability of operation when just burning Zhundong coal. After one-year operation, no fouling and slagging was found on the furnace heating surface when using Zhundong coal with 6% of Na₂O in ash. The funnel temperature maintains around 150 ℃ when the soot blower for low temperature coal economizer is in operation.