循环流化床锅炉抵御沾污的对策

对循环流化床(Circulating Fluidized Bed,CFB)锅炉燃用典型高钠煤及解决方案进行了综述。首先对比了沾污与结渣的特点与区别,明确目前尚无成熟可靠的方法来解决沾污问题。接着从沾污生成机理着手,分析了沾污的生成过程,阐明沾污通常还伴随着腐蚀。然后根据CFB锅炉的特点,论述其低燃烧温度及气固两相流动在抵御沾污方面的优势,并根据试验结果及现场实际锅炉的运行情况阐述了CFB锅炉的沾污特性。最后,根据CFB锅炉的沾污特点,总结了CFB锅炉燃高钠煤时防止沾污的措施。

Countermeasures against Fouling in Circulating Fluidized Bed Boiler

This paper presents a review of solutions to and countermeasures against typical fouling due to high sodium content in coal combusted in circulating fluidized bed ( CFB) boilers, The mechanism of fouling and that of slagging are compared concluding that there are no effective and available methods to solve the fouling issues till now. The paper further provides details of the fouling mechanism and its formation process, indicating that the fouling is usually followed by corrosion. Advantages of CFB boilers in anti-fouling due to the two-phase flow characteristic and combustion temperature are given, and the fouling in a CFB boiler along with an experimental study and on a test rig is discussed. Finally, on the basis of the fouling characteristics in CFB boilers, the anti-fouling solutions and methods are presented and relative active methods such as boiler with flue gas recycling system are submitted.