解决六角切圆锅炉结渣问题的研究及工程应用

针对某六角切圆燃烧煤粉锅炉存在的水冷壁及炉膛出口过热器区域结渣问题，借鉴四角切圆锅炉的经验和研究成果，对射流偏转情况和结渣原因进行理论分析，并结合燃烧器区域气固两相流动的PDA(Particle Dynamics Analyzer)冷态模化试验，提出了工程技术改造方案，取得了很好的工程应用效果。研究表明，适当地采用一、二次风同心双切圆形式布置，能够有效地改善炉内的流场分布，从而抑制受热面结渣现象的发生。

RESEARCH AND ENGINEERING APPLICATION ON SOLVING SLAGGING PROBLEM OF HEXAGONAL TANGENTIALLY FIRED BOILER

In order to solve the slagging problem happened on the water-cooled wall and super-heater at the exit of furnace of a hexagonal tangentially fired boiler burning pulverized coal, based on the experience and research achievement of quadrangular tangentially fired boiler, the jet deviation and the reason causing slagging were analyzed theoretically, a PDA (Particle Dynamics Analyzer) cold model experiment of gas-solid two-phase flow near burner zone was also proceeded, and then a retrofit proposal of engineering technology was put forwarded which achieved a good engineering application. Research results show that adopting homocentric two tangential circles of primary air and secondary air properly can improve the flow field distribution in furnace effectively, thus, the slagging of heat-transfer surface is controlled.